k8s二进制安装
基础环境准备
1.配置本地hosts解析
192.168.0.71 k8s-master01
192.168.0.72 k8s-master02
192.168.0.73 k8s-master03
192.168.0.236 k8s-master-lb
192.168.0.74 k8s-node01
192.168.0.75 k8s-node02
2.配置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
3.安装必备软件
yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git -y
4.关闭冲突软件
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
5.所有节点停掉swap
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
6.配置时间同步
安装ntpdate
rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
yum install ntpdate -y
所有节点同步时间。时间同步配置如下：
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
cd /root/ ; git clone https://github.com.cnpmjs.org/dotbalo/k8s-ha-install.git
7.系统内核优化
vim /etc/security/limits.conf
i# 末尾添加如下内容
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
master01配置所有节点免密登陆
ssh-keygen
for i in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02;do sshpass -p1 ssh-copy-id -i /root/.ssh/id_rsa.pub -o StrictHostKeyChecking=no $i;done
为了避免k8s版本太新导致与内核版本不兼容需要升级系统及内核版本
升级系统
yum update -y --exclude=kernel* && reboot
升级系统内核
# 下载内核升级包
cd /root
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm
# 所有节点安装内核
cd /root && yum localinstall -y kernel-ml*
# 更改内核启动顺序
grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg
grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"
# 检查内核版本情况
[root@k8s-master02 ~]# grubby --default-kernel
/boot/vmlinuz-4.19.12-1.el7.elrepo.x86_64
8.所有节点安装lvs
# 安装软件包
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systemctl enable --now systemd-modules-load.service即可
# 检查是否加载：
[root@k8s-master01 ~]# 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 </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
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
安装部署docker及k8s组件
安装docker
yum install docker-ce-19.03.* -y
配置docker
mkdir /etc/docker
cat > /etc/docker/daemon.json <
{
"exec-opts": ["native.cgroupdriver=systemd"],
"insecure-registries": ["harbor.michaelxia.cn"]
}
EOF
启动docker
systemctl daemon-reload && systemctl enable --now docker
安装部署k8s组件及etcd
下载k8s安装包
wget https://dl.k8s.io/v1.20.0/kubernetes-server-linux-amd64.tar.gz
下载etcd安装包
官方地址：v3.5 docs | etcd
ETCD_VER=v3.5.0
# choose either URL
GOOGLE_URL=https://storage.googleapis.com/etcd
GITHUB_URL=https://github.com/etcd-io/etcd/releases/download
DOWNLOAD_URL=${GOOGLE_URL}
rm -f /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz
rm -rf /tmp/etcd-download-test && mkdir -p /tmp/etcd-download-test
curl -L ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz -o etcd-${ETCD_VER}-linux-amd64.tar.gz
# curl -L https://storage.googleapis.com/etcd/v3.5.0/etcd-v3.5.0-linux-amd64.tar.gz -o etcd-v3.5.0-linux-amd64.tar.gz
解压
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}
tar -zxvf etcd-v3.5.0-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.0-linux-amd64/etcd{,ctl}
分发组件到各节点
MasterNodes='k8s-master02 k8s-master03'
WorkNodes='k8s-node01 k8s-node02'
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
Master01上在软件包项目中切换分支到1.20
cd k8s-ha-install && git checkout manual-installation-v1.20.x
生成证书
在k8s内部各组件交互过程中，k8s是通过双向认证来保障数据传输安全性的，因此各组件在通信时需要通过证书加密传输，master和node节点都需要配置相应的证书才可以实现通信。
这里使用cfssl来生成证书工具
在master01上准备cfssl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
etcd证书
在所有master节点创建etcd证书目录
mkdir /etc/etcd/ssl -p
创建kubernetes相关证书目录
mkdir -p /etc/kubernetes/pki
生成etcd证书
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=127.0.0.1,192.168.0.71,192.168.0.72,192.168.0.73,192.168.0.76,192.168.0.77,192.168.0.78 \
--profile=kubernetes \
etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd
将证书复制到其他节点
MasterNodes='k8s-master02 k8s-master03'
WorkNodes='k8s-node01 k8s-node02'
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
K8S组件证书
Master01生成kubernetes CA证书
[root@k8s-master01 pki]# cd /root/k8s-ha-install/pki
cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca
# 查询证书有效期
openssl x509 -in /etc/kubernetes/pki/ca.pem -noout -dates
# 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
# 如果不是高可用集群，192.168.0.236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=10.96.0.1,192.168.0.236,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.0.71,192.168.0.72,192.168.0.73 -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
返回结果（忽略警告）
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，192.168.0.236:8443改为master01的地址，8443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://192.168.0.236:8443 \
--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
# 设置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，192.168.0.236:8443改为master01的地址，8443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://192.168.0.236:8443 \
--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
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，192.168.0.236:8443改为master01的地址，8443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://192.168.0.236:8443 --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
openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub
发送证书到各master节点
#!/bin/bash
for NODE in k8s-master02 k8s-master03
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
配置etcd及高可用架构
etcd配置
三节点分别编写配置文件
master01
vim /etc/etcd/etcd.config.yml
iname: 'k8s-master01'
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://192.168.0.71:2380'
listen-client-urls: 'https://192.168.0.71:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.0.71:2380'
advertise-client-urls: 'https://192.168.0.71:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.0.71:2380,k8s-master02=https://192.168.0.72:2380,k8s-master03=https://192.168.0.73:2380'
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
master02
vim /etc/etcd/etcd.config.yml
iname: 'k8s-master02'
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://192.168.0.72:2380'
listen-client-urls: 'https://192.168.0.72:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.0.72:2380'
advertise-client-urls: 'https://192.168.0.72:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.0.71:2380,k8s-master02=https://192.168.0.72:2380,k8s-master03=https://192.168.0.73:2380'
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
Master03
vim /etc/etcd/etcd.config.yml
iname: 'k8s-master03'
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://192.168.0.73:2380'
listen-client-urls: 'https://192.168.0.73:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.0.73:2380'
advertise-client-urls: 'https://192.168.0.73:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.0.71:2380,k8s-master02=https://192.168.0.72:2380,k8s-master03=https://192.168.0.73:2380'
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
配置启动管理
vim /usr/lib/systemd/system/etcd.service
i[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
配置etcd证书路径
mkdir /etc/kubernetes/pki/etcd
ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
systemctl daemon-reload
systemctl enable --now etcd
启动成功后查看状态
export ETCDCTL_API=3
etcdctl --endpoints="192.168.0.73:2379,192.168.0.72:2379,192.168.0.71:2379" --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
配置高可用架构
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。
安装keepalive与haproxy
yum install keepalived haproxy nginx-all-modules.noarch -y
通过nginx实现高可用调度
vim /etc/nginx/nginx.conf
# 在event模块后面添加四层代理
stream {
server {
listen 8443;
proxy_pass k8s_api;
}
upstream k8s_api {
server 192.168.0.71:6443;
server 192.168.0.72:6443;
server 192.168.0.73:6443;
}
}
所有节点ha配置相同
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 0.0.0.0:8443
bind 127.0.0.1:8443
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 k8s-master01 192.168.0.71:6443 check
server k8s-master02 192.168.0.72:6443 check
server k8s-master03 192.168.0.73:6443 check
master01keepalive
! 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 192.168.0.71
virtual_router_id 51
priority 101
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.0.236
}
track_script {
chk_apiserver
} }
# 7.2 Master02 keepalived
! 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 192.168.0.72
virtual_router_id 51
priority 100
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.0.236
}
track_script {
chk_apiserver
} }
# 7.3 Master03 keepalived
! 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 192.168.0.73
virtual_router_id 51
priority 100
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.0.236
}
track_script {
chk_apiserver
} }
防脑裂脚本
vim /etc/keepalived/check_apiserver.sh
i#!/bin/bash
err=0
for k in $(seq 1 3)
do
check_code=$(pgrep nginx)
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
systemctl enable --now haproxy.service keepalived.service
配置各组件并启动
kube-apiserver
配置参数地址：kube-apiserver | Kubernetes
vim /usr/lib/systemd/system/kube-apiserver.service
i[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=192.168.0.71 \
--service-cluster-ip-range=10.96.0.0/12 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.0.71:2379,https://192.168.0.72:2379,https://192.168.0.73:2379 \
--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
# --token-auth-file=/etc/kubernetes/token.csv
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
controller-manager
配置详解：kube-controller-manager | Kubernetes
vim /usr/lib/systemd/system/controller-manager.service
i[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=172.16.0.0/12 \
--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
scheduler
vim /usr/lib/systemd/system/kube-scheduler.service
i[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
systemctl daemon-reload
systemctl enable --now kube-apiserver.service controller-manager.service kube-scheduler.service
通过Bootstrapping签发node节点证书
cd /root/k8s-ha-install/bootstrap
kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.0.236:8443 --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
mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config
kubectl create -f bootstrap.secret.yaml
向node分发证书
cd /etc/kubernetes/
for NODE in k8s-master02 k8s-master03 k8s-node01 k8s-node02; do
ssh $NODE mkdir -p /etc/kubernetes/pki /etc/etcd/ssl /etc/etcd/ssl
for FILE in etcd-ca.pem etcd.pem etcd-key.pem; do
scp /etc/etcd/ssl/$FILE $NODE:/etc/etcd/ssl/
done
for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig; do
scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE}
done
done
部署kubelet
所有节点创建相关目录
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@k8s-master01 bootstrap]# vim /usr/lib/systemd/system/kubelet.service
i[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service
[Service]
ExecStart=/usr/local/bin/kubelet
Restart=always
StartLimitInterval=0
RestartSec=10
[Install]
WantedBy=multi-user.target
所有节点配置kubelet service的配置文件
vim /etc/systemd/system/kubelet.service.d/10-kubelet.conf
i[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-amd64:3.2"
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node=''"
ExecStart=
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS
准备kubelet配置文件
[root@k8s-master01 bootstrap]# vim /etc/kubernetes/kubelet-conf.yml
iapiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 10.96.0.10
clusterDomain: cluster.local
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
imagefs.available: 15%
memory.available: 100Mi
nodefs.available: 10%
nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s
启动kubelet
systemctl daemon-reload
systemctl enable --now kubelet
部署kube-proxy
以下操作在Master01执行
cd /root/k8s-ha-install
kubectl -n kube-system create serviceaccount kube-proxy
kubectl create clusterrolebinding system:kube-proxy --clusterrole system:node-proxier --serviceaccount kube-system:kube-proxy
SECRET=$(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://192.168.0.236:8443 --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
准备proxy service文件
vim /usr/lib/systemd/system/kube-proxy.service
i[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.conf \
--v=2
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
准备kube-proxy配置文件
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: 172.16.0.0/12
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
[root@k8s-master01 kube-proxy]# cat kube-proxy.conf
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: 172.16.0.0/12
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
for NODE in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02; do
scp ${K8S_DIR}/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
scp kube-proxy/kube-proxy.conf $NODE:/etc/kubernetes/kube-proxy.conf
scp kube-proxy/kube-proxy.service $NODE:/usr/lib/systemd/system/kube-proxy.service
done
for NODE in; do
scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
scp kube-proxy/kube-proxy.conf $NODE:/etc/kubernetes/kube-proxy.conf
scp kube-proxy/kube-proxy.service $NODE:/usr/lib/systemd/system/kube-proxy.service
done
systemctl daemon-reload
systemctl enable --now kube-proxy
安装cni网络插件
calico官方文档地址：Configuring calico/node
sed -i 's#etcd_endpoints: "http://: "#etcd_endpoints: "https://192.168.0.71:2379,https://192.168.0.72:2379,https://192.168.0.73:2379"#g' calico-etcd.yaml
ETCD_CA=`cat /etc/kubernetes/pki/etcd/etcd-ca.pem | base64 | tr -d '\n'`
ETCD_CERT=`cat /etc/kubernetes/pki/etcd/etcd.pem | base64 | tr -d '\n'`
ETCD_KEY=`cat /etc/kubernetes/pki/etcd/etcd-key.pem | base64 | tr -d '\n'`
sed -i "s@# etcd-key: null@etcd-key: ${ETCD_KEY}@g; s@# etcd-cert: null@etcd-cert: ${ETCD_CERT}@g; s@# etcd-ca: null@etcd-ca: ${ETCD_CA}@g" calico-etcd.yaml
sed -i 's#etcd_ca: ""#etcd_ca: "/calico-secrets/etcd-ca"#g; s#etcd_cert: ""#etcd_cert: "/calico-secrets/etcd-cert"#g; s#etcd_key: "" #etcd_key: "/calico-secrets/etcd-key" #g' calico-etcd.yaml
# 更改此处为自己的pod网段
POD_SUBNET="172.16.0.0/12"
sed -i 's@# - name: CALICO_IPV4POOL_CIDR@- name: CALICO_IPV4POOL_CIDR@g; s@# value: "192.168.0.0/16"@ value: '"${POD_SUBNET}"'@g' calico-etcd.yaml
遇到的坑：
如果添加了环境变量在calico-controller和calico-node中添加env环境指向apiserver
- name: KUBERNETES_SERVICE_HOST
value: "192.168.0.236"
- name: KUBERNETES_SERVICE_PORT
value: "8443"
- name: KUBERNETES_SERVICE_PORT_HTTPS
value: "8443"
安装calico
kubectl apply -f calico-etcd.yaml
docker pull registry.cn-beijing.aliyuncs.com/dotbalo/cni:v3.15.3
docker pull registry.cn-beijing.aliyuncs.com/dotbalo/pod2daemon-flexvol:v3.15.3
docker pull registry.cn-beijing.aliyuncs.com/dotbalo/node:v3.15.3
docker pull registry.cn-beijing.aliyuncs.com/dotbalo/kube-controllers:v3.15.3
docker tag registry.cn-beijing.aliyuncs.com/dotbalo/cni:v3.15.3 harbor.michaelxia.cn/calico/cni:v3.15.3
docker tag registry.cn-beijing.aliyuncs.com/dotbalo/pod2daemon-flexvol:v3.15.3 harbor.michaelxia.cn/calico/pod2daemon-flexvol:v3.15.3
docker tag registry.cn-beijing.aliyuncs.com/dotbalo/node:v3.15.3 harbor.michaelxia.cn/calico/node:v3.15.3
docker tag registry.cn-beijing.aliyuncs.com/dotbalo/kube-controllers:v3.15.3 harbor.michaelxia.cn/calico/kube-controllers:v3.15.3
docker push harbor.michaelxia.cn/calico/cni:v3.15.3
docker push harbor.michaelxia.cn/calico/pod2daemon-flexvol:v3.15.3
docker push harbor.michaelxia.cn/calico/node:v3.15.3
docker push harbor.michaelxia.cn/calico/kube-controllers:v3.15.3
安装coredns
cd /root/k8s-ha-install/
# 设定coredns的解析地址为clusterip中的第十个ip
sed -i "s#10.96.0.10#10.96.0.10#g" CoreDNS/coredns.yaml
kubectl create -f CoreDNS/coredns.yaml
安装metric
cd /root/k8s-ha-install/metrics-server-0.4.x/
kubectl create -f .
集群验证
- 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之前要能通
- 同namespace能通信
- 跨namespace能通信
创建dashboard
cd /root/k8s-ha-install/dashboard/
kubectl create -f .
企业级k8s配置
docker配置
vim /etc/docker/daemon.json
i{
"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
}
controllermanager配置
--cluster-signing-duration=876000h0m0s #配置当kubelet证书过期后，bootsrap签发证书的有效期为100年
kubelet配置
vim /etc/systemd/system/kubelet.service.d/10-kubelet.conf
# 修改加密方式保证kubelet安全性检测
--tls-cipher-suites=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
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
kubectl连接多个k8s集群
假如已经准备好2个集群的配置文件，分别为 $HOME/.kube/config1 和 ``$HOME/.kube/config2
config1 信息如下
[root@node-01 .kube]# cat $HOME/.kube/config1
apiVersion: v1
kind: Config
clusters:
- cluster:
api-version: v1
certificate-authority-data: xxxxxxx
server: "https://172.20.8.113:6443"
name: "cn-k8s"
contexts:
- context:
cluster: "cn-k8s"
user: "kube-admin-local"
name: "cn-k8s"
current-context: "cn-k8s"
users:
- name: "kube-admin-local"
user:
client-certificate-data: xxxxxx
client-key-data: xxxxxx
config2 信息如下
[root@node-01 .kube]# cat $HOME/.kube/config2
apiVersion: v1
kind: Config
clusters:
- cluster:
api-version: v1
certificate-authority-data: xxxxxx
server: "https://172.19.8.113:6443"
name: "jp-k8s"
contexts:
- context:
cluster: "jp-k8s"
user: "kube-admin-local"
name: "jp-k8s"
current-context: "jp-k8s"
users:
- name: "kube-admin-local"
user:
client-certificate-data: xxxxxx
client-key-data: xxxxxx
通过config信息，可以看到两个集群的cluster name，context name，以及用户信息。
配置文件已准备好，下面开始变身了。文件合成：
cd $HOME/.kube/config
KUBECONFIG=config1:config2 kubectl config view --flatten > $HOME/.kube/config
那么如何使用呢？
1、查看cluster name以及context name
[root@node-01 ~]# kubectl config view
apiVersion: v1
clusters:
- cluster:
certificate-authority-data: DATA+OMITTED
server: https://172.19.8.113:6443
name: cnlocal
- cluster:
certificate-authority-data: DATA+OMITTED
server: https://172.19.8.113:6443
name: jplocal
contexts:
- context:
cluster: cnlocal
user: kube-admin-local
name: cnlocal
- context:
cluster: jplocal
user: kube-admin-local
name: local
current-context: jplocal
kind: Config
preferences: {}
users:
- name: kube-admin-local
user:
client-certificate-data: REDACTED
client-key-data: REDACTED
2、查看当前使用的集群
[root@node-01 ~]# kubectl config current-context
jplocal
3、修改当前使用的集群
[root@node-01 ~]# kubectl config use-context cnlocal
Switched to context "cnlocal".
安装过程中需要注意的问题：
-
kubeadm
-
二进制
-
自动化安装
- Ansible
- Master节点安装不需要写自动化。
- 添加Node节点，playbook。
-
安装需要注意的细节
- 上面的细节配置
- 生产环境中etcd一定要和系统盘分开，一定要用ssd硬盘。
- Docker数据盘也要和系统盘分开，有条件的话可以使用ssd硬盘