kubernetes 1.15 install for kubeadm
安装条件
- 阿里云镜像服务器访问畅通
- dockerhub可以访问
- Centos7.7系统
Base-server方式安装 - 必要的docker k8s基础知识
集群创建前的准备
| ip地址 | 节点角色 | CPU | 内存 | 主机名 | 存储 |
|---|---|---|---|---|---|
| 192.168.100.101.111 | master | 2c | 4G | k8s-master001 | 200GB |
| 192.168.100.101.121 | worker | 2c | 4G | k8s-node001 | 200GB |
| 192.168.100.101.122 | worker | 2c | 4G | k8s-node002 | 200GB |
| 192.168.100.101.123 | worker | 2c | 4G | k8s-node003 | 200GB |
| 192.168.100.101.124 | worker | 2c | 4G | k8s-node004 | 200GB |
部署环境为nat模式下的内网服务器，即家庭网络环境、办公室网络环境
一、服务器环境初始化
- 设置hostname 在不同的机器上执行以下命令
hostnamectl set-hostname k8s-master001
hostnamectl set-hostname k8s-node001
hostnamectl set-hostname k8s-node002
hostnamectl set-hostname k8s-node003
hostnamectl set-hostname k8s-node004修改
/etc/sysconfig/network增加HOSTNAME=k8s-master001,注意更改为相应的主机名喔
- 关闭防火墙、swap、selinux
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab- 修改内核参数、将桥接网卡的ipv4流量转发到iptables的链表
cat /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1- 执行sysctl 载入配置文件参数
modprobe br_netfilter
sysctl --system- 增加ipvs的开启参数
cat /etc/sysconfig/modules/ipvs.modules
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4- 增加ipvs.modules文件可执行权限
chmod 755 /etc/sysconfig/modules/ipvs.modules
/bin/bash -x /etc/sysconfig/modules/ipvs.modules
lsmod | grep "ip_vs" - 增加阿里云
epelyum源
CentOS-Base有163的源,速度很快不用更换，如果是阿里云服务器建议使用阿里云CentOS-Base内网更快
yum install -y wget
#wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum clean all && yum makecache- 增加
k8s``docker-ceyum源
cat /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg该内容可以通过 opsx.alibaba.com搜索
kubernetes``帮助获取
增加docker-ceyum源
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
- 安装依赖包
yum -y install ipset ipvsadm yum-utils device-mapper-persistent-data lvm2- 查看yum仓库中
Docker版本 一定要加上--showduplicates参数，不然只会出现最新版本的rpm包
[root@k8s-master001 ~]# yum list docker-ce.x86_64 --showduplicates |sort -r
Loading mirror speeds from cached hostfile
Loaded plugins: fastestmirror
Installed Packages
docker-ce.x86_64 3:19.03.2-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.1-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.0-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.9-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.8-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.7-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.7-3.el7 @docker-ce-stable
docker-ce.x86_64 3:18.09.6-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.5-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.4-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.3-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.2-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.1-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.0-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.3.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.2.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.1.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.0.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.03.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 18.03.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.12.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.12.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.09.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.09.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.06.2.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.06.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.06.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.03.3.ce-1.el7 docker-ce-stable
docker-ce.x86_64 17.03.2.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.03.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.03.0.ce-1.el7.centos docker-ce-stable - Install
Docker
yum makecache fast
yum install -y --setopt=obsoletes=0 docker-ce-18.09.8-3.el7.x86_64
systemctl start docker
systemctl enable docker增加
--setopt=obsoletes=0
obsoletes=value
…where value is one of:
0 — Disable yum's obsoletes processing logic when performing updates.
1 — Enable yum's obsoletes processing logic when performing updates. When one package declares in its spec file that it obsoletes another package, the latter package will be replaced by the former package when the former package is installed. Obsoletes are declared, for example, when a package is renamed. obsoletes=1 the default.查看iptables filter表中FOWARD链表中策略是否为
ACCEPT放行状态。如果不是执行iptables -P FORWARD ACCEPT
[root@k8s-master001 k8s-yum]# iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination 查看Docker cgroup driver状态是否为systemd,如果不是systemd请修改配置文件改回systemd
[root@k8s-master001 ~]# docker info | grep Cgroup
Cgroup Driver: systemd
cat /etc/docker/daemon.json #如果不是请修改配置文件
{
"exec-opts": ["native.cgroupdriver=systemd"]
}- 重启docker 使配置生效
systemctl restart docker
- Install kubeadm、kubelet
yum install -y kubelet-1.15.3-0.x86_64 kubeadm-1.15.3-0.x86_64 kubelet-1.15.3-0.x86_64kubelet启动并设置开机启动
systemctl start kubelet.service
systemctl enable kubelet.service- 查看集群默认的初始化配置信息
kubeadm config print init-defaults
apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
- system:bootstrappers:kubeadm:default-node-token
token: abcdef.0123456789abcdef
ttl: 24h0m0s
usages:
- signing
- authentication
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: 1.2.3.4
bindPort: 6443
nodeRegistration:
criSocket: /var/run/dockershim.sock
name: k8s-master001
taints:
- effect: NoSchedule
key: node-role.kubernetes.io/master
---
apiServer:
timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns:
type: CoreDNS
etcd:
local:
dataDir: /var/lib/etcd
imageRepository: k8s.gcr.io
kind: ClusterConfiguration
kubernetesVersion: v1.15.0
networking:
dnsDomain: cluster.local
serviceSubnet: 10.96.0.0/12
scheduler: {}其中advertiseAddress是指api-server的ip地址，也就是k8s-master001内网ip地址192.168.101.111。
serviceSubnet是集群将要采用的网段地址，我们使用10.244.0.0/16。
- 初始化k8s集群在
k8s-master001上操作
kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.101.111 --ignore-preflight-errors=Swap执行后发现会报以下错误,这是因为无法访问k8s.gcr.io网站。
[root@k8s-master001 ~]# kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.101.111 --ignore-preflight-errors=Swap
W0913 00:40:38.345859 31641 version.go:98] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get https://dl.k8s.io/release/stable-1.txt: dial tcp: lookup dl.k8s.io on [::1]:53: read udp [::1]:60967->[::1]:53: read: connection refused
W0913 00:40:38.346081 31641 version.go:99] falling back to the local client version: v1.15.3
[init] Using Kubernetes version: v1.15.3
[preflight] Running pre-flight checks
[WARNING Hostname]: hostname "k8s-master001" could not be reached
[WARNING Hostname]: hostname "k8s-master001": lookup k8s-master001 on [::1]:53: read udp [::1]:45558->[::1]:53: read: connection refused
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-apiserver:v1.15.3: output: Error response from daemon: Get https://k8s.gcr.io/v2/: dial tcp: lookup k8s.gcr.io on [::1]:53: read udp [::1]:51990->[::1]:53: read: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-controller-manager:v1.15.3: output: Error response from daemon: Get https://k8s.gcr.io/v2/: dial tcp: lookup k8s.gcr.io on [::1]:53: read udp [::1]:43086->[::1]:53: read: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-scheduler:v1.15.3: output: Error response from daemon: Get https://k8s.gcr.io/v2/: dial tcp: lookup k8s.gcr.io on [::1]:53: read udp [::1]:55885->[::1]:53: read: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-proxy:v1.15.3: output: Error response from daemon: Get https://k8s.gcr.io/v2/: dial tcp: lookup k8s.gcr.io on [::1]:53: read udp [::1]:48386->[::1]:53: read: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/pause:3.1: output: Error response from daemon: Get https://k8s.gcr.io/v2/: dial tcp: lookup k8s.gcr.io on [::1]:53: read udp [::1]:43804->[::1]:53: read: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/etcd:3.3.10: output: Error response from daemon: Get https://k8s.gcr.io/v2/: dial tcp: lookup k8s.gcr.io on [::1]:53: read udp [::1]:49557->[::1]:53: read: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/coredns:1.3.1: output: Error response from daemon: Get https://k8s.gcr.io/v2/: dial tcp: lookup k8s.gcr.io on [::1]:53: read udp [::1]:51683->[::1]:53: read: connection refused
, error: exit status 1
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`- 换源设置改为阿里云,查看需要的容器镜像
kubeadm config images list
[root@k8s-master001 ~]# kubeadm config images list
W0913 00:44:21.703361 32321 version.go:98] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get https://dl.k8s.io/release/stable-1.txt: dial tcp: lookup dl.k8s.io on [::1]:53: read udp [::1]:37790->[::1]:53: read: connection refused
W0913 00:44:21.703519 32321 version.go:99] falling back to the local client version: v1.15.3
k8s.gcr.io/kube-apiserver:v1.15.3
k8s.gcr.io/kube-controller-manager:v1.15.3
k8s.gcr.io/kube-scheduler:v1.15.3
k8s.gcr.io/kube-proxy:v1.15.3
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd:3.3.10
k8s.gcr.io/coredns:1.3.1- pull阿里云镜像Images更改tag
温馨提示:虽然是国内源但pull过程依然有些慢,建议冲杯咖啡、奶茶
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.3
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.3
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.3
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.3
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.3 k8s.gcr.io/kube-apiserver:v1.15.3
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.3 k8s.gcr.io/kube-controller-manager:v1.15.3
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.3 k8s.gcr.io/kube-scheduler:v1.15.3
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.3 k8s.gcr.io/kube-proxy:v1.15.3
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1- 再次执行集群初始化操作
[root@k8s-master001 tmp]# kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.101.111 --ignore-preflight-errors=Swap
[init] Using Kubernetes version: v1.15.3
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Activating the kubelet service
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [k8s-master001 localhost] and IPs [192.168.101.111 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [k8s-master001 localhost] and IPs [192.168.101.111 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [k8s-master001 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.101.111]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[kubelet-check] Initial timeout of 40s passed.
[apiclient] All control plane components are healthy after 44.009526 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.15" in namespace kube-system with the configuration for the kubelets in the cluster
[upload-certs] Skipping phase. Please see --upload-certs
[mark-control-plane] Marking the node k8s-master001 as control-plane by adding the label "node-role.kubernetes.io/master=''"
[mark-control-plane] Marking the node k8s-master001 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: f3xr55.iv29dsas70lrf0jo
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.101.111:6443 --token f3xr55.iv29dsas70lrf0jo \
--discovery-token-ca-cert-hash sha256:2f939d02abb31a087b4c3f4b1202c4efeaa6f9ee165abb705f8e2b19d41e132c - 根据输出提示进行以下操作
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config- 保存记录好节点加入集群命令
kubeadm join 192.168.101.111:6443 --token f3xr55.iv29dsas70lrf0jo \
--discovery-token-ca-cert-hash sha256:2f939d02abb31a087b4c3f4b1202c4efeaa6f9ee165abb705f8e2b19d41e132c- 注意除了集群初始化操作在k8s-master001上执行,其它的操作每个节点都要执行
二、node节点加入集群
- 执行
kubeadm join输出以下信息即为成功,其中的WARNING是因为/etc/hosts没有配置,忽略即可没有影响
[root@k8s-node001 tmp]# kubeadm join 192.168.101.111:6443 --token f3xr55.iv29dsas70lrf0jo \
--discovery-token-ca-cert-hash sha256:2f939d02abb31a087b4c3f4b1202c4efeaa6f9ee165abb705f8e2b19d41e132c
[preflight] Running pre-flight checks
[WARNING Hostname]: hostname "k8s-node001" could not be reached
[WARNING Hostname]: hostname "k8s-node001": lookup k8s-node001 on 192.168.100.37:53: no such host
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.15" ConfigMap in the kube-system namespace
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Activating the kubelet service
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the control-plane to see this node join the cluster.- Tips:第三天k8s-node003加入集群报错
error execution phase preflight: couldn't validate the identity of the API Server: abort connecting to API servers after timeout of 5m0s集群运行一段时间后 后续加入节点的时候提示上面这个错误,是master
token证书过期,好像有效期只有24小时,创建新的token即可解决，方法如下。
[root@k8s-master001 ~]# kubeadm token create
2cwxr3.01v9qv5kbt69fzxa
[root@k8s-master001 ~]# openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | awk {'print $2'}
2f939d02abb31a087b4c3f4b1202c4efeaa6f9ee165abb705f8e2b19d41e132c- 使用新token添加新节点
[root@k8s-node003 ~]# kubeadm join 192.168.101.111:6443 --token 2cwxr3.01v9qv5kbt69fzxa --discovery-token-ca-cert-hash sha256:2f939d02abb31a087b4c3f4b1202c4efeaa6f9ee165abb705f8e2b19d41e132c- 查看集群以及
nodes状态
root@k8s-master001 ~]# kubectl get cs
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health":"true"}
[root@k8s-master001 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master001 NotReady master 2h v1.15.3
k8s-node001 NotReady 1h v1.15.3 可以看到集群是健康的，但是node节点状态是notready这是因为我们仅仅创建了集群还没有安装网络插件
二、安装必要的插件、网络插件
-
Install
flannel网络插件[root@k8s-master001 k8s]# curl -O https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml [root@k8s-master001 k8s]# cat kube-flannel.yml | grep '"Network"' "Network": "10.244.0.0/16" kubectl create -f kube-flannel.yml配置文件网段和创建集群是的网段一致，此处不需要修改.
-
查看插件启动状态
[root@k8s-master001 ~]# kubectl get pod -n kube-system NAME READY STATUS RESTARTS AGE coredns-5c98db65d4-6v8zm 1/1 Running 0 1h coredns-5c98db65d4-7xdsn 1/1 Running 0 1h etcd-k8s-master001 1/1 Running 0 1h kube-apiserver-k8s-master001 1/1 Running 0 1h kube-controller-manager-k8s-master001 1/1 Running 0 1h kube-proxy-97jz2 1/1 Running 0 1h kube-proxy-lftz2 1/1 Running 0 1h kube-scheduler-k8s-master001 1/1 Running 0 1h -
kube-proxy更改为ipvs模式mode: ""更改为mode: "ipvs"kubectl edit cm kube-proxy -n kube-system -
Install
dashboard插件wget https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml kubectl create -f kubernetes-dashboard.yaml root@k8s-master001 k8s]# kubectl get svc kubernetes-dashboard -n kube-system NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes-dashboard NodePort 10.111.189.89443:32576/TCP 21s 其状态一直是
ImagePullBackOff[root@k8s-master001 tmp]# kubectl get pods,svc -n kube-system | grep kubernetes-dashboard pod/kubernetes-dashboard-7d75c474bb-ljdhp 0/1 ImagePullBackOff 0 14m docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kubernetes-dashboard-amd64:v1.10.1 docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kubernetes-dashboard-amd64:v1.10.1 k8s.gcr.io/kubernetes-dashboard-amd64:v1.10.1 -
生成
tokendashboard登录支持Kubeconfig和token两种认证方式Kubeconfig中也依赖tokenkubectl create serviceaccount dashboard-admin -n kube-system kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin - 获取 Dashboard
token
[root@k8s-master001 tmp]# kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')
Name: dashboard-admin-token-hqj4v
Namespace: kube-system
Labels:
Annotations: kubernetes.io/service-account.name: dashboard-admin
kubernetes.io/service-account.uid: 56931c3b-ce9d-456c-9e12-3597163fff47
Type: kubernetes.io/service-account-token
Data
====
ca.crt: 1025 bytes
namespace: 11 bytes
token: eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQv
c2VjcmV0Lm5hbWUiOiJkYXNoYm7hcmQtYWRtaW4tdG9rZW4taHFqNHYiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC5uYW1lIjoiZGFzaGJvYXJkLWFkbWluIiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY
291bnQudWlkIjoiNTY5MzFjM2ItY2U5ZC00NTZjLTllMTItMzU5NzE2M2ZmZjQ3Iiwic3ViIjoic3lzdGVtOnNlcnZpY2VhY2NvdW50Omt1YmUtc3lzdGVtOmRhc2hib2FyZC1hZG1pbiJ9.sYIp7MzgFw6jSBRN63GX4y3j9yfyvYnmAw1BN4FsoiU5rdaSDle1lGWwleMGh
Y5lNHTpoQwUXAzl6uQmrhFCQPFsZZEIaPaSWEzHxuwmYO3uiaLcJB4_0wtC_DiKpLx_JV8NQwYmgAlgL2s2HxLeuweSHcMcxwIccA5CHdRPoh0_r6NjHc1yf4s6vzNQUpfNMj3k34_Oe7YmpU6eGFONvxzDigy5kWG4QDE4m3g4ceeYqjydJ_gRMjfu86E_VxGgbeILBK3OQd
GsqK8i5GZz8IziDOd3sYicHqbwDgGXiGZfPuqtu4FbDSKV1lZ8VWK0sRuuww3idCGuG7gzMkB2hw - Install Helm Client
wget https://get.helm.sh/helm-v2.14.3-linux-amd64.tar.gz
tar -zxf helm-v2.14.3-linux-amd64.tar.gz
cp helm /usr/local/bin/
[root@k8s-master001 linux-amd64]# helm version
Client: &version.Version{SemVer:"v2.14.3", GitCommit:"0e7f3b6637f7af8fcfddb3d2941fcc7cbebb0085", GitTreeState:"clean"}
Error: could not find tiller- Install Helm server
tiller
helm init --upgrade --tiller-image registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.14.3
[root@k8s-master001 k8s]# kubectl get pod -n kube-system -l app=helm
NAME READY STATUS RESTARTS AGE
tiller-deploy-6867df9fc6-xh6hh 1/1 Running 0 112s
root@k8s-master001 k8s]# helm version
Client: &version.Version{SemVer:"v2.14.3", GitCommit:"0e7f3b6637f7af8fcfddb3d2941fcc7cbebb0085", GitTreeState:"clean"}
Server: &version.Version{SemVer:"v2.14.3", GitCommit:"0e7f3b6637f7af8fcfddb3d2941fcc7cbebb0085", GitTreeState:"clean"}Tiller增加ServiceAccount
apiVersion: v1
kind: ServiceAccount
metadata:
name: tiller
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
name: tiller
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: tiller
namespace: kube-systemEND
至此最小集群已经安装完成了,这里只安装了最核心的k8s服务。
参考文献
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/sec-configuring_yum_and_yum_repositories
https://kubernetes.io/zh/docs/reference/setup-tools/kubeadm/kubeadm