二进制部署高可用k8s集群
第一章、前置知识点
1.1 生产环境部署K8S集群的两种方式
- kubeadm
Kubeadm是一个K8S部署工具，提供kubeadm init 和 kubeadm join，用于快速部署Kubernetes集群。
- 二进制包
从GitHub下载发行版的二进制包，手动部署每个组件，组成Kubernetes集群。
- 小结：
Kubeadm降低部署门槛，但屏蔽了很多细节，遇到问题很难排查。如果想更容易可控，推荐使用二进制包部署Kubernetes集群，虽然手动部署麻烦点，期间可以学习很多工作原理，也利于后期维护。
1.2 准备环境
- 服务器要求：
- 建议最小硬件配置：2核CPU、2G内存、30G硬盘。
- 服务器最好可以访问外网，会从网上拉取镜像需求，如果服务器不能上网，需要提前下载对应镜像并导入节点。
- 软件环境：
软件 版本
操作系统 CentOS7.x_x64
容器引擎 Docker CE 19
Kubernetes Kubernetes v1.22
- 服务器规划：
| 角色 | IP | 组件 |
|---|---|---|
| master1.k8s.test | 10.140.20.141 | kube-apiserver,kube-controller-manager,kube-scheduler,docker,etcd，haproxy,keepalived |
| master2.k8s.test | 10.140.20.142 | kube-apiserver,kube-controller-manager,kube-scheduler,docker,etcd, haproxy,keepalived |
| master3.k8s.test | 10.140.20.143 | kube-apiserver,kube-controller-manager,kube-scheduler,docker,etcd, haproxy,keepalived |
| node01.k8s.test | 10.140.20.156 | kubelet，kube-proxy，docker，etcd |
第二章、 安装说明
本文章将演示Centos7二进制方式安装高可用k8s 1.22+，相对于其他版本，二进制安装方式并无太大区别，只需要区分每个组件版本的对应关系即可。
生产环境中，建议使用小版本大于5的Kubernetes版本，比如1.19.5以后的才可用于生产环境。
第三章、集群安装
3.1 基本环境配置
主机信息，服务器IP地址不能设成dhcp方式，要配置成静态IP。
配置主机名：
10.140.20.141 master1.k8s.test
10.140.20.142 master2.k8s.test
10.140.20.143 master3.k8s.test
10.140.20.141 k8s-master-lb # 如果不是高可用集群，该IP为Master01的IP
10.140.20.156 node1.k8s.test
网段划分：
K8S Service网段：10.96.0.0/16
K8S Pod网段： 10.244.0.0/16
K8S Node网段： 192.168.31.0/24
注意：宿主机网段、K8S Service网段、Pod网段不能重复。
系统环境：
[root@master1 ~]# more /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
[root@master1 ~]#
配置所有节点hosts文件：
[root@master1 ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
10.140.20.141 master1.k8s.test
10.140.20.142 master2.k8s.test
10.140.20.143 master3.k8s.test
10.140.20.141 k8s-master-lb # 如果不是高可用集群，该IP为Master01的IP
10.140.20.156 node1.k8s.test
CentOS 7安装yum源：
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
必备工具安装:
yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git -y
所有节点关闭firewalld 、dnsmasq、selinux(CentOS7需要关闭NetworkManager，CentOS8不需要)
systemctl disable --now firewalld
systemctl disable --now dnsmasq
systemctl disable --now NetworkManager
setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
所有节点关闭swap分区，fstab注释swap：
swapoff -a && sysctl -w vm.swappiness=0
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab
所有节点同步时间：
rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
yum install ntpdate -y
ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo 'Asia/Shanghai' >/etc/timezone
ntpdate time2.aliyun.com
# 加入到crontab
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com
所有节点配置limit：
ulimit -SHn 65535
vim /etc/security/limits.conf
# 末尾添加如下内容
* soft nofile 65536
* hard nofile 131072
* soft nproc 65535
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
配置免密登录：
Master01节点免密钥登录其他节点，安装过程中生成配置文件和证书均在Master01上操作，集群管理也在Master01上操作，阿里云或者AWS上需要单独一台kubectl服务器。密钥配置如下：
[root@master1 ~]# ssh-keygen -t rsa
Master01配置免密码登录其他节点：
[root@master1 ~]# for i in master1.k8s.test master2.k8s.test master3.k8s.test k8s-node01 k8s-node02;do ssh-copy-id -i .ssh/id_rsa.pub $i;done
Master01下载安装文件：
[root@master1 ~]# cd /root/ ; git clone https://github.com/dotbalo/k8s-ha-install.git
Cloning into 'k8s-ha-install'...
remote: Enumerating objects: 12, done.
remote: Counting objects: 100% (12/12), done.
remote: Compressing objects: 100% (11/11), done.
remote: Total 461 (delta 2), reused 5 (delta 1), pack-reused 449
Receiving objects: 100% (461/461), 19.52 MiB | 4.04 MiB/s, done.
Resolving deltas: 100% (163/163), done.
如果无法clone可以使用https://gitee.com/dukuan/k8s-ha-install.git进行克隆。
所有节点升级系统并重启，此处升级没有升级内核，下节会单独升级内核：
yum update -y --exclude=kernel* && reboot
#CentOS7需要升级，CentOS8可以按需升级系统
3.2 内核升级
CentOS7 需要升级内核至4.18+，本次升级的版本为6.3
在master01节点下载内核：
cd /root
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-6.3.2-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-6.3.2-1.el7.elrepo.x86_64.rpm
从master01节点传到其他节点：
for i in master2.k8s.test master3.k8s.test k8s-node01 k8s-node02;do scp kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm $i:/root/ ; done
所有节点安装内核
cd /root && yum localinstall -y kernel-ml*
所有节点更改内核启动顺序
grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg
grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"
检查默认内核是不是63.
[root@master2 ~]# grubby --default-kernel
/boot/vmlinuz-6.3.2-1.el7.elrepo.x86_64
所有节点重启，然后检查内核是不是6.3。
所有节点安装ipvsadm：
yum install ipvsadm ipset sysstat conntrack libseccomp -y
所有节点配置ipvs模块，在内核4.19+版本nf_conntrack_ipv4已经改为nf_conntrack， 4.18以下使用nf_conntrack_ipv4即可：
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack
vim /etc/modules-load.d/ipvs.conf
# 加入以下内容
ip_vs
ip_vs_lc
ip_vs_wlc
ip_vs_rr
ip_vs_wrr
ip_vs_lblc
ip_vs_lblcr
ip_vs_dh
ip_vs_sh
ip_vs_fo
ip_vs_nq
ip_vs_sed
ip_vs_ftp
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
然后执行命令即可
systemctl enable --now systemd-modules-load.service
检查是否加载：
[root@master1 ~]# lsmod | grep -e ip_vs -e nf_conntrack
nf_conntrack_ipv4 16384 23
nf_defrag_ipv4 16384 1 nf_conntrack_ipv4
nf_conntrack 135168 10 xt_conntrack,nf_conntrack_ipv6,nf_conntrack_ipv4,nf_nat,nf_nat_ipv6,ipt_MASQUERADE,nf_nat_ipv4,xt_nat,nf_conntrack_netlink,ip_vs
开启一些k8s集群中必须的内核参数，所有节点配置k8s内核：
cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
net.ipv4.conf.all.route_localnet = 1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF
sysctl --system
所有节点配置完内核后，重启服务器，保证重启后内核依旧加载
reboot
lsmod | grep --color=auto -e ip_vs -e nf_conntrack
第四章、基本组件安装
本节主要安装的是集群中用到的各种组件。比如Docker-ce、kubernetes各组件等。
4.1 Docker安装
所有节点安装Docker-ce 19.03
yum install docker-ce-19.03.* docker-ce-cli-19.03.* -y
温馨提示：
由于新版kubelet建议使用systemd，所以可以把docker的CgroupDriver改成systemd
mkdir /etc/docker
cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"]
}
EOF
所有节点设置开机自启动Docker：
systemctl daemon-reload && systemctl enable --now docker
4.2 K8s及etcd安装
Master01下载kubernetes安装包：
[root@master1 ~]# wget https://dl.k8s.io/v1.22.6/kubernetes-server-linux-amd64.tar.gz
wget https://dl.k8s.io/v1.22.17/kubernetes-server-linux-amd64.tar.gz
注意目前版本是1.22.6，安装时需要下载最新的1.22.x版本：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.22.md
以下操作都在master01执行：
下载etcd安装包：
[root@master1 ~]# wget https://github.com/etcd-io/etcd/releases/download/v3.5.9/etcd-v3.5.9-linux-amd64.tar.gz
wget https://github.com/etcd-io/etcd/releases/download/v3.5.0/etcd-v3.5.0-linux-amd64.tar.gz
解压kubernetes安装文件
[root@master1 ~]# tar -xf kubernetes-server-linux-amd64.tar.gz --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy}
解压etcd安装文件
[root@master1 ~]# tar -zxvf etcd-v3.5.9-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.9-linux-amd64/etcd{,ctl}
版本查看：
[root@master1 ~]# kubelet --version
Kubernetes v1.22.6
[[email protected] ~]# etcdctl version
etcdctl version: 3.5.0
API version: 3.5
[root@master1 ~]#
将组件发送到其他节点：
MasterNodes='master2.k8s.test master3.k8s.test'
WorkNodes='node1.k8s.test'
for NODE in $MasterNodes; do echo $NODE; scp /usr/local/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} $NODE:/usr/local/bin/; scp /usr/local/bin/etcd* $NODE:/usr/local/bin/; done
for NODE in $WorkNodes; do scp /usr/local/bin/kube{let,-proxy} $NODE:/usr/local/bin/ ; done
所有节点创建/opt/cni/bin目录：
mkdir -p /opt/cni/bin
切换分支：
Master01节点切换到1.22.x分支（其他版本可以切换到其他分支，.x即可，不需要更改为具体的小版本）
cd /root/k8s-ha-install && git checkout manual-installation-v1.22.x
第五章、生成证书
二进制安装最关键步骤，一步错误全盘皆输，一定要注意每个步骤都要是正确的。
Master01下载生成证书工具
wget "https://pkg.cfssl.org/R1.2/cfssl_linux-amd64" -O /usr/local/bin/cfssl
wget "https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64" -O /usr/local/bin/cfssljson
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson
5.1 etcd证书
所有Master节点创建etcd证书目录
mkdir /etc/etcd/ssl -p
所有节点创建kubernetes相关目录
mkdir -p /etc/kubernetes/pki
Master01节点生成etcd证书
生成证书的CSR文件：证书签名请求文件，配置了一些域名、公司、单位
[root@master1 pki]# cd /root/k8s-ha-install/pki
# 生成etcd CA证书和CA证书的key
cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca
cfssl gencert -ca=/etc/etcd/ssl/etcd-ca.pem -ca-key=/etc/etcd/ssl/etcd-ca-key.pem -config=ca-config.json -hostname=127.0.0.1,master1.k8s.test,master2.k8s.test,master3.k8s.test,10.140.20.141,10.140.20.142,10.140.20.143, -profile=kubernetes etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd
执行结果
2023/05/16 15:53:33 [INFO] generate received request
2023/05/16 15:53:33 [INFO] received CSR
2023/05/16 15:53:33 [INFO] generating key: rsa-2048
2023/05/16 15:53:33 [INFO] encoded CSR
2023/05/16 15:53:33 [INFO] signed certificate with serial number 189052540690168442492442794802253693390408995729
[root@master1 ssl]# cd /etc/etcd/ssl/
[[email protected] ssl]# ls
etcd-ca.csr etcd-ca-key.pem etcd-ca.pem etcd.csr etcd-key.pem etcd.pem
[root@master1 ssl]#
将证书复制到其他节点：
MasterNodes='master2.k8s.test master3.k8s.test'
for NODE in $MasterNodes; do
ssh $NODE "mkdir -p /etc/etcd/ssl"
for FILE in etcd-ca-key.pem etcd-ca.pem etcd-key.pem etcd.pem; do
scp /etc/etcd/ssl/${FILE} $NODE:/etc/etcd/ssl/${FILE}
done
done
5.2 k8s组件证书
- Master01生成kubernetes ca 证书
[root@master1 pki]# cd /root/k8s-ha-install/pki
cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca
- 生成apiserver证书
#10.96.0.是k8s service的网段，如果说需要更改k8s service网段，那就需要更改10.96.0.1，建议多写几个IP地址，为扩容master节点准备
#如果不是高可用集群，10.140.20.141为Master01的IP
cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=ca-config.json -hostname=10.96.0.1,10.140.20.141,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,10.140.20.141,10.141.20.142,10.141.20.143 -profile=kubernetes apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver
生成apiserver的聚合证书。Requestheader-client-xxx requestheader-allowwd-xxx:aggerator
cfssl gencert -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca
cfssl gencert -ca=/etc/kubernetes/pki/front-proxy-ca.pem -ca-key=/etc/kubernetes/pki/front-proxy-ca-key.pem -config=ca-config.json -profile=kubernetes front-proxy-client-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-client
- 生成controller-manage的证书
cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=ca-config.json -profile=kubernetes manager-csr.json | cfssljson -bare /etc/kubernetes/pki/controller-manager
# 注意，如果不是高可用集群，10.140.20.141:6443改为master01的地址，6443改为apiserver的端口，默认是6443
# set-cluster：设置一个集群项，
kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://10.140.20.141:6443 --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
# 设置一个环境项，一个上下文
kubectl config set-context system:kube-controller-manager@kubernetes --cluster=kubernetes --user=system:kube-controller-manager --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
# set-credentials 设置一个用户项
kubectl config set-credentials system:kube-controller-manager --client-certificate=/etc/kubernetes/pki/controller-manager.pem --client-key=/etc/kubernetes/pki/controller-manager-key.pem --embed-certs=true --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
# 使用某个环境当做默认环境
kubectl config use-context system:kube-controller-manager@kubernetes --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
- 生成scheduler证书
cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=ca-config.json -profile=kubernetes scheduler-csr.json | cfssljson -bare /etc/kubernetes/pki/scheduler
# 注意，如果不是高可用集群，10.140.20.141:6443改为master01的地址，6443改为apiserver的端口，默认是6443
kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://10.140.20.141:6443 --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
kubectl config set-credentials system:kube-scheduler --client-certificate=/etc/kubernetes/pki/scheduler.pem --client-key=/etc/kubernetes/pki/scheduler-key.pem --embed-certs=true --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
kubectl config set-context system:kube-scheduler@kubernetes --cluster=kubernetes --user=system:kube-scheduler --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
kubectl config use-context system:kube-scheduler@kubernetes --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
- 生成admin证书
cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare /etc/kubernetes/pki/admin
# 注意，如果不是高可用集群，10.140.20.141:6443改为master01的地址，6443改为apiserver的端口，默认是6443
kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://10.140.20.141:6443 --kubeconfig=/etc/kubernetes/admin.kubeconfig
kubectl config set-credentials kubernetes-admin --client-certificate=/etc/kubernetes/pki/admin.pem --client-key=/etc/kubernetes/pki/admin-key.pem --embed-certs=true --kubeconfig=/etc/kubernetes/admin.kubeconfig
kubectl config set-context kubernetes-admin@kubernetes --cluster=kubernetes --user=kubernetes-admin --kubeconfig=/etc/kubernetes/admin.kubeconfig
kubectl config use-context kubernetes-admin@kubernetes --kubeconfig=/etc/kubernetes/admin.kubeconfig
- 创建ServiceAccount Key->secret
openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
返回结果
Generating RSA private key, 2048 bit long modulus (2 primes)
...................................................................................+++++
...............+++++
e is 65537 (0x010001)
openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub
发送证书至其他节点:
for NODE in master2.k8s.test master3.k8s.test; do
for FILE in $(ls /etc/kubernetes/pki | grep -v etcd); do scp /etc/kubernetes/pki/${FILE} $NODE:/etc/kubernetes/pki/${FILE};
done;
for FILE in admin.kubeconfig controller-manager.kubeconfig scheduler.kubeconfig; do
scp /etc/kubernetes/${FILE} $NODE:/etc/kubernetes/${FILE};
done;
done
5.3 检验证书
#查看证书文件，确保生成的证书是23个
[root@master2 kubernetes]# ls /etc/kubernetes/pki/|wc -l
23
[root@master2 kubernetes]# ls /etc/kubernetes/pki/
admin.csr apiserver-key.pem ca.pem front-proxy-ca.csr front-proxy-client-key.pem scheduler.csr
admin-key.pem apiserver.pem controller-manager.csr front-proxy-ca-key.pem front-proxy-client.pem scheduler-key.pem
admin.pem ca.csr controller-manager-key.pem front-proxy-ca.pem sa.key scheduler.pem
apiserver.csr ca-key.pem controller-manager.pem front-proxy-client.csr sa.pub
[root@master2 kubernetes]# ls /etc/kubernetes/
admin.kubeconfig controller-manager.kubeconfig pki scheduler.kubeconfig
第六章、 Kubernetes系统组件配置
6.1 Etcd配置
etcd配置大致相同，注意修改每个Master节点的etcd配置的主机名和IP地址。
6.1.1 Master01
cat > /etc/etcd/etcd.config.yml << EOF
name: 'master1.k8s.test'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://10.140.20.141:2380'
listen-client-urls: 'https://10.140.20.141:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.140.20.141:2380'
advertise-client-urls: 'https://10.140.20.141:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'master1.k8s.test=https://10.140.20.141:2380,master2.k8s.test=https://10.140.20.142:2380,master3.k8s.test=https://10.140.20.143:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
6.1.2 Master02
cat > /etc/etcd/etcd.config.yml << EOF
name: 'master2.k8s.test'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://10.140.20.142:2380'
listen-client-urls: 'https://10.140.20.142:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.140.20.142:2380'
advertise-client-urls: 'https://10.140.20.142:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'master1.k8s.test=https://10.140.20.141:2380,master2.k8s.test=https://10.140.20.142:2380,master3.k8s.test=https://10.140.20.143:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
6.1.3 Master03
cat > /etc/etcd/etcd.config.yml << EOF
name: 'master3.k8s.test'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://10.140.20.143:2380'
listen-client-urls: 'https://10.140.20.143:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.140.20.143:2380'
advertise-client-urls: 'https://10.140.20.143:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'master1.k8s.test=https://10.140.20.141:2380,master2.k8s.test=https://10.140.20.142:2380,master3.k8s.test=https://10.140.20.143:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
6.1.4 创建Service
所有Master节点创建etcd service并启动
cat > /usr/lib/systemd/system/etcd.service << EOF
[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target
[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
Alias=etcd3.service
EOF
6.1.5 所有Master节点创建etcd的证书目录
mkdir /etc/kubernetes/pki/etcd
ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
systemctl daemon-reload
systemctl enable --now etcd
查看etcd状态
export ETCDCTL_API=3
etcdctl --endpoints="10.140.20.143:2379,10.140.20.142:2379,10.140.20.141:2379" --cacert=/etc/kubernetes/pki/etcd/etcd-ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem endpoint status --write-out=table
+--------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+--------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 10.140.20.143:2379 | 2a5b796cadaf7df9 | 3.5.9 | 20 kB | true | false | 2 | 9 | 9 | |
| 10.140.20.142:2379 | 58b160318edea505 | 3.5.9 | 20 kB | false | false | 2 | 9 | 9 | |
| 10.140.20.141:2379 | ea4af3a294d72d25 | 3.5.9 | 20 kB | false | false | 2 | 9 | 9 | |
+--------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
第七章、高可用配置
高可用配置（注意：如果不是高可用集群，haproxy和keepalived无需安装）
如果在云上安装也无需执行此章节的步骤，可以直接使用云上的lb，比如阿里云slb，腾讯云elb等
公有云要用公有云自带的负载均衡，比如阿里云的SLB，腾讯云的ELB，用来替代haproxy和keepalived，因为公有云大部分都是不支持keepalived的，另外如果用阿里云的话，kubectl控制端不能放在master节点，推荐使用腾讯云，因为阿里云的slb有回环的问题，也就是slb代理的服务器不能反向访问SLB，但是腾讯云修复了这个问题。
Slb -> haproxy -> apiserver
所有Master节点安装keepalived和haproxy
yum install keepalived haproxy -y
7.1 Haproxy配置，所有Master节点的配置是一样的。
vim /etc/haproxy/haproxy.cfg
global
maxconn 2000
ulimit-n 16384
log 127.0.0.1 local0 err
stats timeout 30s
defaults
log global
mode http
option httplog
timeout connect 5000
timeout client 50000
timeout server 50000
timeout http-request 15s
timeout http-keep-alive 15s
frontend k8s-master
bind 0.0.0.0:6443
bind 127.0.0.1:6443
mode tcp
option tcplog
tcp-request inspect-delay 5s
default_backend k8s-master
backend k8s-master
mode tcp
option tcplog
option tcp-check
balance roundrobin
default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
server master1.k8s.test 10.140.20.141:6443 check
server master2.k8s.test 10.140.20.142:6443 check
server master3.k8s.test 10.140.20.143:6443 check
7.2 Master01 keepalived
所有Master节点配置KeepAlived，配置不一样,注意每个节点的IP和网卡（interface参数）
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface eth0
mcast_src_ip 10.140.20.141
virtual_router_id 51
priority 101
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.31.100
}
track_script {
chk_apiserver
} }
7.3 Master02 keepalived
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
mcast_src_ip 10.140.20.142
virtual_router_id 51
priority 100
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.31.100
}
track_script {
chk_apiserver
} }
7.4 Master03 keepalived
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
mcast_src_ip 10.140.20.143
virtual_router_id 51
priority 100
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.31.100
}
track_script {
chk_apiserver
} }
7.5 健康检查配置
所有Master节点：
vim /etc/keepalived/check_apiserver.sh
#!/bin/bash
err=0
for k in $(seq 1 3)
do
check_code=$(pgrep haproxy)
if [[ $check_code == "" ]]; then
err=$(expr $err + 1)
sleep 1
continue
else
err=0
break
fi
done
if [[ $err != "0" ]]; then
echo "systemctl stop keepalived"
/usr/bin/systemctl stop keepalived
exit 1
else
exit 0
fi
chmod +x /etc/keepalived/check_apiserver.sh
所有master节点启动haproxy和keepalived：
systemctl daemon-reload
systemctl enable --now haproxy
systemctl enable --now keepalived
7.6 VIP测试
[root@master1 ~]# ping 192.168.31.100
PING 192.168.31.100 (192.168.31.100) 56(84) bytes of data.
64 bytes from 192.168.31.100: icmp_seq=1 ttl=64 time=0.041 ms
64 bytes from 192.168.31.100: icmp_seq=2 ttl=64 time=0.054 ms
64 bytes from 192.168.31.100: icmp_seq=3 ttl=64 time=0.067 ms
64 bytes from 192.168.31.100: icmp_seq=4 ttl=64 time=0.033 ms
[root@master1 ~]# telnet 192.168.31.100 6443
Trying 192.168.31.100...
Connected to 192.168.31.100.
Escape character is '^]'.
Connection closed by foreign host.
如果ping不通且telnet没有出现 ]，则认为VIP不可以，不可在继续往下执行，需要排查keepalived的问题，比如防火墙和selinux，haproxy和keepalived的状态，监听端口等
所有节点查看防火墙状态必须为disable和inactive：systemctl status firewalld
所有节点查看selinux状态，必须为disable：getenforce
master节点查看haproxy和keepalived状态：systemctl status keepalived haproxy
master节点查看监听端口：netstat -lntp
第八章 Kubernetes组件配置
所有节点创建相关目录
mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes
8.1 Apiserver
所有Master节点创建kube-apiserver service，# 注意，如果不是高可用集群，10.140.20.141改为master01的地址
8.1.1 Master01 配置
注意本文档使用的K8s service 网段为 10.96.0.0/16，该网段不能和宿主机的网段、Pod网段的重复，请按需修改
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver --v=2 --logtostderr=true --allow-privileged=true --bind-address=0.0.0.0 --secure-port=6443 --insecure-port=0 --advertise-address=10.140.20.141 --service-cluster-ip-range=10.96.0.0/16 --service-node-port-range=30000-32767 --etcd-servers=https://10.140.20.141:2379,https://10.140.20.142:2379,https://10.140.20.143:2379 --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem --etcd-certfile=/etc/etcd/ssl/etcd.pem --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem --client-ca-file=/etc/kubernetes/pki/ca.pem --tls-cert-file=/etc/kubernetes/pki/apiserver.pem --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem --service-account-key-file=/etc/kubernetes/pki/sa.pub --service-account-signing-key-file=/etc/kubernetes/pki/sa.key --service-account-issuer=https://kubernetes.default.svc.cluster.local --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota --authorization-mode=Node,RBAC --enable-bootstrap-token-auth=true --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem --requestheader-allowed-names=aggregator --requestheader-group-headers=X-Remote-Group --requestheader-extra-headers-prefix=X-Remote-Extra- --requestheader-username-headers=X-Remote-User
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
8.1.2 Master02配置
注意本文档使用的K8s service 网段为 10.96.0.0/16，该网段不能和宿主机的网段、Pod网段的重复，请按需修改
[root@master2 ~]# cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver --v=2 --logtostderr=true --allow-privileged=true --bind-address=0.0.0.0 --secure-port=6443 --insecure-port=0 --advertise-address=10.140.20.142 --service-cluster-ip-range=10.96.0.0/16 --service-node-port-range=30000-32767 --etcd-servers=https://10.140.20.141:2379,https://10.140.20.142:2379,https://10.140.20.143:2379 --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem --etcd-certfile=/etc/etcd/ssl/etcd.pem --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem --client-ca-file=/etc/kubernetes/pki/ca.pem --tls-cert-file=/etc/kubernetes/pki/apiserver.pem --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem --service-account-key-file=/etc/kubernetes/pki/sa.pub --service-account-signing-key-file=/etc/kubernetes/pki/sa.key --service-account-issuer=https://kubernetes.default.svc.cluster.local --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota --authorization-mode=Node,RBAC --enable-bootstrap-token-auth=true --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem --requestheader-allowed-names=aggregator --requestheader-group-headers=X-Remote-Group --requestheader-extra-headers-prefix=X-Remote-Extra- --requestheader-username-headers=X-Remote-User
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
8.1.3 Master03 配置
注意本文档使用的K8s service 网段为 10.96.0.0/16，该网段不能和宿主机的网段、Pod网段的重复，请按需修改
[root@master3 pki]# cat > /usr/lib/systemd/system/kube-apiserver.service <
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-apiserver --v=2 --logtostderr=true --allow-privileged=true --bind-address=0.0.0.0 --secure-port=6443 --insecure-port=0 --advertise-address=10.140.20.143 --service-cluster-ip-range=10.96.0.0/16 --service-node-port-range=30000-32767 --etcd-servers=https://10.140.20.141:2379,https://10.140.20.142:2379,https://10.140.20.143:2379 --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem --etcd-certfile=/etc/etcd/ssl/etcd.pem --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem --client-ca-file=/etc/kubernetes/pki/ca.pem --tls-cert-file=/etc/kubernetes/pki/apiserver.pem --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem --service-account-key-file=/etc/kubernetes/pki/sa.pub --service-account-signing-key-file=/etc/kubernetes/pki/sa.key --service-account-issuer=https://kubernetes.default.svc.cluster.local --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota --authorization-mode=Node,RBAC --enable-bootstrap-token-auth=true --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem --requestheader-allowed-names=aggregator --requestheader-group-headers=X-Remote-Group --requestheader-extra-headers-prefix=X-Remote-Extra- --requestheader-username-headers=X-Remote-User
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
8.1.4 启动apiserver
所有master节点启动kube-apiserver
systemctl daemon-reload && systemctl enable --now kube-apiserver
检测kube-server状态
systemctl status kube-apiserver
8.2 ControllerManager
所有Master节点配置kube-controller-manager service（所有master节点配置一样）
注意本文档使用的k8s Pod网段为10.244.0.0/16，该网段不能和宿主机的网段、k8s Service网段的重复，请按需修改
[root@master1 ~]# cat > /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-controller-manager --v=2 --logtostderr=true --address=127.0.0.1 --root-ca-file=/etc/kubernetes/pki/ca.pem --cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem --cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem --service-account-private-key-file=/etc/kubernetes/pki/sa.key --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig --leader-elect=true --use-service-account-credentials=true --node-monitor-grace-period=40s --node-monitor-period=5s --pod-eviction-timeout=2m0s --controllers=*,bootstrapsigner,tokencleaner --allocate-node-cidrs=true --cluster-cidr=10.244.0.0/16 --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem --node-cidr-mask-size=24
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
所有Master节点启动kube-controller-manager:
systemctl daemon-reload
systemctl enable --now kube-controller-manager
查看启动状态：
[root@master1 ~]# systemctl status kube-controller-manager
8.3 Scheduler
所有Master节点配置kube-scheduler service（所有master节点配置一样）
[root@master1 ~]# vim /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-scheduler --v=2 --logtostderr=true --address=127.0.0.1 --leader-elect=true --kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
[root@master1 ~]# systemctl daemon-reload
[root@master1 ~]# systemctl enable --now kube-scheduler
第九章 TLS Bootstrapping配置
只需要在Master01创建bootstrap
#注意，如果不是高可用集群，10.140.20.141:6443改为master01的地址，6443改为apiserver的端口，默认是6443
cd /root/k8s-ha-install/bootstrap
kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://10.140.20.141:6443 --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config set-credentials tls-bootstrap-token-user --token=c8ad9c.2e4d610cf3e7426e --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config set-context tls-bootstrap-token-user@kubernetes --cluster=kubernetes --user=tls-bootstrap-token-user --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config use-context tls-bootstrap-token-user@kubernetes --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
注意：如果要修改bootstrap.secret.yaml的token-id和token-secret，需要保证下图红圈内的字符串一致的，并且位数是一样的。还要保证上个命令的token：c8ad9c.2e4d610cf3e7426e与你修改的字符串要一致
[root@master1 bootstrap]# mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config
可以正常查询集群状态，才可以继续往下，否则不行，需要排查k8s组件是否有故障
[root@master1 bootstrap]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-1 Healthy {"health":"true","reason":""}
etcd-0 Healthy {"health":"true","reason":""}
etcd-2 Healthy {"health":"true","reason":""}
[root@master1 bootstrap]# kubectl create -f bootstrap.secret.yaml
secret/bootstrap-token-c8ad9c created
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-certificate-rotation created
clusterrole.rbac.authorization.k8s.io/system:kube-apiserver-to-kubelet created
clusterrolebinding.rbac.authorization.k8s.io/system:kube-apiserver created
第十章 Node节点配置
10.1 复制证书
Master01节点复制证书至Node节点
cd /etc/kubernetes/
for NODE in master2.k8s.test master3.k8s.test node1.k8s.test; do
ssh $NODE mkdir -p /etc/kubernetes/pki
for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig; do
scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE}
done
done
检查证书文件：
[root@node1 kubernetes]# pwd
/etc/kubernetes
[root@k8s-node01 kubernetes]# tree
.
├── bootstrap-kubelet.kubeconfig
├── manifests
└── pki
├── ca-key.pem
├── ca.pem
└── front-proxy-ca.pem
2 directories, 4 files
[root@k8s-node01 kubernetes]#
10.2 Kubelet配置
所有节点创建相关目录（如果存在，忽略）
mkdir -p /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/
- 所有节点配置Kubelet service
[root@master1 ~]# cat > /usr/lib/systemd/system/kubelet.service <
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service
[Service]
EnvironmentFile=/etc/systemd/system/kubelet.service.d/10-kubelet.conf
ExecStart=/usr/local/bin/kubelet \$KUBELET_OPTS
Restart=always
StartLimitInterval=0
RestartSec=10
[Install]
WantedBy=multi-user.target
EOF
- 所有节点配置kubelet service的配置文件
mkdir -p /etc/cni/net.d
cat > /etc/systemd/system/kubelet.service.d/10-kubelet.conf <<EOF
KUBELET_OPTS="--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig --network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin --config=/etc/kubernetes/kubelet-conf.yml --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.5 --node-labels=node.kubernetes.io/node='' --logtostderr=true --v=2"
EOF
- 所有节点创建kubelet的配置文件
注意：如果更改了k8s的service网段，需要更改kubelet-conf.yml 的clusterDNS:配置，改成k8s Service网段的第十个地址，比如10.96.0.10
cat > /etc/kubernetes/kubelet-conf.yml <<EOF
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 10.96.0.10
clusterDomain: cluster.local
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
imagefs.available: 15%
memory.available: 100Mi
nodefs.available: 10%
nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s
EOF
- 启动所有节点kubelet
systemctl daemon-reload
systemctl enable --now kubelet
- 查看集群状态
[root@master1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master1.k8s.test NotReady <none> 11m v1.22.17
master2.k8s.test NotReady <none> 46s v1.22.17
master3.k8s.test NotReady <none> 48s v1.22.17
node1.k8s.test NotReady <none> 51s v1.22.17
注：由于网络插件还没有部署，节点会没有准备就绪 NotReady。
10.3 kube-proxy配置
#注意，如果不是高可用集群，10.140.20.141:6443改为master01的地址，6443改为apiserver的端口，默认是6443
- 创建kube-proxy.kubeconfig文件，只需要在Master01上执行
kubectl -n kube-system create serviceaccount kube-proxy
kubectl create clusterrolebinding system:kube-proxy --clusterrole system:node-proxier --serviceaccount kube-system:kube-proxy
SECRET=$(kubectl -n kube-system get sa/kube-proxy --output=jsonpath='{.secrets[0].name}')
JWT_TOKEN=$(kubectl -n kube-system get secret/$SECRET --output=jsonpath='{.data.token}' | base64 -d)
PKI_DIR=/etc/kubernetes/pki
K8S_DIR=/etc/kubernetes
kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://10.140.20.141:6443 --kubeconfig=${K8S_DIR}/kube-proxy.kubeconfig
kubectl config set-credentials kubernetes --token=${JWT_TOKEN} --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config set-context kubernetes --cluster=kubernetes --user=kubernetes --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config use-context kubernetes --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
- 将kubeconfig发送至其他节点
for NODE in master2.k8s.test master3.k8s.test node1.k8s.test; do
scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
done
- 所有节点添加kube-proxy的配置和service文件
cat > /usr/lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/usr/local/bin/kube-proxy --config=/etc/kubernetes/kube-proxy.yaml --v=2
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
如果更改了集群Pod的网段，需要更改kube-proxy.yaml的clusterCIDR为自己的Pod网段：
cat > /etc/kubernetes/kube-proxy.yaml << EOF
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
clientConnection:
acceptContentTypes: ""
burst: 10
contentType: application/vnd.kubernetes.protobuf
kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
qps: 5
clusterCIDR: 10.244.0.0/16
configSyncPeriod: 15m0s
conntrack:
max: null
maxPerCore: 32768
min: 131072
tcpCloseWaitTimeout: 1h0m0s
tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
masqueradeAll: false
masqueradeBit: 14
minSyncPeriod: 0s
syncPeriod: 30s
ipvs:
masqueradeAll: true
minSyncPeriod: 5s
scheduler: "rr"
syncPeriod: 30s
kind: KubeProxyConfiguration
metricsBindAddress: 127.0.0.1:10249
mode: "ipvs"
nodePortAddresses: null
oomScoreAdj: -999
portRange: ""
udpIdleTimeout: 250ms
EOF
- 所有节点启动kube-proxy
systemctl daemon-reload
systemctl enable --now kube-proxy
systemctl status kube-proxy
第十一章 安装Calico
11.1 安装官方推荐版本
以下步骤只在Master01上执行
cd /root/k8s-ha-install/calico/
# 更改calico的网段，改为自己的Pod的网段
sed -i "s#POD_CIDR#10.244.0.0/16#g" calico.yaml
更改后如下所示：
[root@master1 calico]# grep "IPV4POOL_CIDR" calico.yaml -A 1
- name: CALICO_IPV4POOL_CIDR
value: "10.244.0.0/16"
安装calico
kubectl apply -f calico.yaml
#查看容器状态
[root@master1 calico]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system calico-kube-controllers-66686fdb54-qnsnn 1/1 Running 0 42s
kube-system calico-node-2hm5d 1/1 Running 0 42s
kube-system calico-node-lbt6k 1/1 Running 0 42s
kube-system calico-node-pm8r9 1/1 Running 0 42s
kube-system calico-node-vxvd5 1/1 Running 0 42s
kube-system calico-typha-67c6dc57d6-96qjq 1/1 Running 0 42s
kube-system calico-typha-67c6dc57d6-h8rqw 1/1 Running 0 42s
kube-system calico-typha-67c6dc57d6-z6qlj 1/1 Running 0 42s
[root@master1 calico]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master1.k8s.test Ready <none> 73m v1.22.17
master2.k8s.test Ready <none> 62m v1.22.17
master3.k8s.test Ready <none> 62m v1.22.17
node1.k8s.test Ready <none> 62m v1.22.17
如果容器状态异常可以使用kubectl describe 或者kubectl logs查看容器的日志。
第十二章 安装CoreDNS
12.1 安装官方推荐版本(推荐)
#如果更改了k8s service的网段需要将coredns的serviceIP改成k8s service网段的第十个IP
cd /root/k8s-ha-install/
COREDNS_SERVICE_IP=`kubectl get svc | grep kubernetes | awk '{print $3}'`0
sed -i "s#192.168.0.10#${COREDNS_SERVICE_IP}#g" CoreDNS/coredns.yaml
#安装Coredns
[[email protected] k8s-ha-install]# kubectl create -f CoreDNS/coredns.yaml
serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.apps/coredns created
service/kube-dns created
#检查Pod运作状况
[[email protected] k8s-ha-install]# kubectl get pods -n kube-system -l k8s-app=kube-dns
NAME READY STATUS RESTARTS AGE
coredns-7684f7549-jqnch 1/1 Running 0 30s
[[email protected] k8s-ha-install]# kubectl get svc -n kube-system -l k8s-app=kube-dns
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 54s
12.2 安装最新版CoreDNS
COREDNS_SERVICE_IP=`kubectl get svc | grep kubernetes | awk '{print $3}'`0
git clone https://github.com/coredns/deployment.git
cd deployment/kubernetes
# ./deploy.sh -s -i ${COREDNS_SERVICE_IP} | kubectl apply -f -
serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.apps/coredns created
service/kube-dns created
查看状态
# kubectl get po -n kube-system -l k8s-app=kube-dns
NAME READY STATUS RESTARTS AGE
coredns-85b4878f78-h29kh 1/1 Running 0 8h
第十三章 安装Metrics Server
在新版的Kubernetes中系统资源的采集均使用Metrics-server，可以通过Metrics采集节点和Pod的内存、磁盘、CPU和网络的使用率。
安装metrics server
#没有安装之前，查看
[root@master1 ~]# kubectl api-resources|grep metrics
[root@master1 ~]# kubectl api-resources|grep metrics|wc -l
0
# 安装
cd /root/k8s-ha-install/metrics-server
kubectl create -f .
serviceaccount/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
service/metrics-server created
deployment.apps/metrics-server created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created
#安装之后，查看
[[email protected] metrics-server]# kubectl get pods -n kube-system -l k8s-app=metrics-server
NAME READY STATUS RESTARTS AGE
metrics-server-5c8b499fd7-hvnz7 1/1 Running 0 41s
[[email protected] metrics-server]# kubectl api-resources|grep metrics
nodes metrics.k8s.io/v1beta1 false NodeMetrics
pods metrics.k8s.io/v1beta1 true PodMetrics
#等待metrics server启动然后查看状态
[root@master1 metrics-server]# kubectl top nodes
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
master1.k8s.test 189m 2% 2021Mi 6%
master2.k8s.test 158m 1% 1154Mi 3%
master3.k8s.test 149m 1% 1214Mi 3%
node1.k8s.test 85m 1% 691Mi 2%
第十四章 集群验证
验证步骤：
- Pod必须能解析Service
- Pod必须能解析跨namespace的Service
- 每个节点都必须要能访问Kubernetes的kubernetes svc 443 和kube-dns的service 53
- Pod和Pod之间要能通
a) 同namespace能通信
b） 跨namespace能通信
c) 跨机器能通信
- 安装busybox和nginx进行验证
cat<<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
name: busybox
namespace: default
spec:
containers:
- name: busybox
image: busybox:1.28
command:
- sleep
- "3600"
imagePullPolicy: IfNotPresent
restartPolicy: Always
EOF
[[email protected] ~]# kubectl create deploy nginx --image=nginx --replicas=2
验证：
[root@master1 ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
busybox 1/1 Running 0 54m 10.244.32.130 master1.k8s.test <none> <none>
nginx-6799fc88d8-9hvr8 1/1 Running 0 53m 10.244.85.193 k8s-node01 <none> <none>
nginx-6799fc88d8-vzzg7 1/1 Running 0 53m 10.244.58.196 k8s-node02 <none> <none>
[root@master1 ~]# ping 10.244.85.193
PING 10.244.85.193 (10.244.85.193) 56(84) bytes of data.
64 bytes from 10.244.85.193: icmp_seq=1 ttl=63 time=0.766 ms
64 bytes from 10.244.85.193: icmp_seq=2 ttl=63 time=0.231 ms
64 bytes from 10.244.85.193: icmp_seq=3 ttl=63 time=0.374 ms
64 bytes from 10.244.85.193: icmp_seq=4 ttl=63 time=1.75 ms
64 bytes from 10.244.85.193: icmp_seq=5 ttl=63 time=0.560 ms
[[email protected] ~]# ping 10.244.58.196
PING 10.244.58.196 (10.244.58.196) 56(84) bytes of data.
64 bytes from 10.244.58.196: icmp_seq=1 ttl=63 time=3.34 ms
64 bytes from 10.244.58.196: icmp_seq=2 ttl=63 time=0.364 ms
64 bytes from 10.244.58.196: icmp_seq=3 ttl=63 time=0.270 ms
[root@master1 ~]# telnet 10.96.0.10 53
Trying 10.96.0.10...
Connected to 10.96.0.10.
Escape character is '^]'.
[[email protected] ~]# kubectl exec busybox -n default -- nslookup kubernetes
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: kubernetes
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local
[[email protected] ~]# kubectl exec busybox -n default -- nslookup kube-dns.kube-system
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: kube-dns.kube-system
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
第十五章 安装dashboard
15.1 Dashboard部署
Dashboard用于展示集群中的各类资源，同时也可以通过Dashboard实时查看Pod的日志和在容器中执行一些命令等。
15.1.1 安装指定版本的dashboard
[root@master1 ~]# cd /root/k8s-ha-install/dashboard/
[root@master1 dashboard]# ls
dashboard-user.yaml dashboard.yaml
[root@master1 dashboard]# kubectl create -f .
15.1.2 安装最新版
官方GitHub地址：https://github.com/kubernetes/dashboard
可以在官方dashboard查看到最新版dashboard
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml
#创建管理员用户
vim admin.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: admin-user
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: admin-user
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: admin-user
namespace: kube-system
#创建
kubectl apply -f admin.yaml -n kube-system
15.1.3 登录Dashboard
在谷歌浏览器（Chrome）启动文件中加入启动参数，用于解决无法访问Dashboard的问题，参考图1-1：
--test-type --ignore-certificate-errors
更改dashboard的svc为NodePort类型
kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard
（如果已经为NodePort 忽略此步骤）
查看端口号：
[root@master1 ~]# kubectl get svc kubernetes-dashboard -n kubernetes-dashboard
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes-dashboard NodePort 10.96.62.177 <none> 443:30533/TCP 6m16s
[[email protected] ~]#
根据自己的实例端口号，通过任意安装了kube-proxy的宿主机的IP+端口即可访问到dashboard：
访问Dashboard：https://10.140.20.141:30533（请更改30533为自己的端口），选择登录方式为令牌（即token方式）
查看token值：
[root@master1 ~]# kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')
Name: admin-user-token-6w689
Namespace: kube-system
Labels: <none>
Annotations: kubernetes.io/service-account.name: admin-user
kubernetes.io/service-account.uid: 2b2757c1-8740-46df-ae76-e9b439d45bbf
Type: kubernetes.io/service-account-token
Data
====
ca.crt: 1411 bytes
namespace: 11 bytes
token: eyJhbGciOiJSUzI1NiIsImtpZCI6IjJIX2RlNVhlV3gxVzRyZmhrMmQ3X01POHpXZFBIYWxENTQ4WTJhYmlMak0ifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJhZG1pbi11c2VyLXRva2VuLTZ3Njg5Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQubmFtZSI6ImFkbWluLXVzZXIiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC51aWQiOiIyYjI3NTdjMS04NzQwLTQ2ZGYtYWU3Ni1lOWI0MzlkNDViYmYiLCJzdWIiOiJzeXN0ZW06c2VydmljZWFjY291bnQ6a3ViZS1zeXN0ZW06YWRtaW4tdXNlciJ9.nmTIiYVZKKooYbDmLf_P2rb5NAx6TuXSYlMKew1OU0ALKzIlhyt4HCqxlqgelOLAzm8ek15oc3ej77miG_DCTqz_bZXMXOBpAMCJEqXa0DdYWJd0nHXWauwJOdlBLmzQZDFkImrPbP9v7CKABMhDxu_7XKO8grAuCRJhL2AnfNOfHioc1LWIZ_WcOmOCYvb9JADkS0I_e3AyDgMbWV4gEtlmiAo6MxXKqBGprWnuN0TDEz30rvKcaWEdbUTy4L6kbOM6ogrT_ZQFfnsXzw6CsS103m86-5AXxcdW3af7ddSu5uahDk5pDRQRo9UBe1xJ6pbBf0yNyX-nVfsdF8MYLg
将token值输入到令牌后，单击登录即可访问Dashboard。
第十六章 生产环境关键性配置
- Docker的配置
vim /etc/docker/daemon.json
{
"registry-mirrors": [
"https://registry.docker-cn.com",
"http://hub-mirror.c.163.com",
"https://docker.mirrors.ustc.edu.cn"
],
"exec-opts": ["native.cgroupdriver=systemd"],
"max-concurrent-downloads": 10,
"max-concurrent-uploads": 5,
"log-opts": {
"max-size": "300m",
"max-file": "2"
},
"live-restore": true
}
[[email protected] ~]# systemctl daemon-reload
[[email protected] ~]# systemctl restart docker
- Controller-manager的配置
vim /usr/lib/systemd/system/kube-controller-manager.service
#添加如下配置
# --feature-gates=RotateKubeletClientCertificate=true,RotateKubeletServerCertificate=true \
--cluster-signing-duration=876000h0m0s \
- kubelet配置
（更改K8S的安全扫描方式）
vim /etc/systemd/system/kubelet.service.d/10-kubelet.conf
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig"
Environment="KUBELET_SYSTEM_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin"
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.5"
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node='' --tls-cipher-suites=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 --image-pull-progress-deadline=30m"
ExecStart=
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS
#添加的参数为：--tls-cipher-suites=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 --image-pull-progress-deadline=30m
性能优化，保证物理机能够正常提供服务，根据实际情况，进行调整
vim /etc/kubernetes/kubelet-conf.yml
添加如下配置
rotateServerCertificates: true
allowedUnsafeSysctls:
- "net.core*"
- "net.ipv4.*"
kubeReserved:
cpu: "1"
memory: 1Gi
ephemeral-storage: 10Gi
systemReserved:
cpu: "1"
memory: 1Gi
ephemeral-storage: 10Gi
第十七章 kubectl命令的自动补全功能
yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
echo "source <(kubectl completion bash)" >> ~/.bashrc
source ~/.bashrc
第十八章 节点打上角色的标签（可选）
[root@master1 ~]# kubectl label node master1.k8s.test node-role.kubernetes.io/master=
node/master1.k8s.test labeled
[root@master1 ~]# kubectl label node master1.k8s.test node-role.kubernetes.io/node=
node/master1.k8s.test labeled
[root@master1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master1.k8s.test Ready <none> 11m v1.22.17
master2.k8s.test Ready <none> 46s v1.22.17
master3.k8s.test Ready <none> 48s v1.22.17
node1.k8s.test Ready <none> 51s v1.22.17