kubeadm轻松安装kubernetes1.18版本
安装k8s是进入kubernetes的第一步，但却经常出现一些莫名奇妙的问题。我已经安装了很多遍，今天就把它总结一下1部署架构三台服务器一主两从10.100.10.10 master （安装基础环境 dockermaster）10.100.10.11 node01(安装基础环境 dockernode）10.100.10.12 node02(安装基础环境 dockernode）2 基础环境安装yu
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安装k8s是进入kubernetes的第一步，但却经常出现一些莫名奇妙的问题。我已经安装了很多遍，今天就把它总结一下
1 部署架构
三台服务器一主两从
10.100.10.10 master （安装基础环境 docker master）
10.100.10.11 node01 (安装基础环境 docker node）
10.100.10.12 node02 (安装基础环境 docker node）
2 基础环境
-
安装yum源
我用的是腾讯云的源，感觉还不错
#epel
mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
wget -O /etc/yum.repos.d/epel.repo http://mirrors.cloud.tencent.com/repo/epel-7.repo
#centos
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo
yum clean all
yum makecache
- 关闭selinux和防火墙
setenforce 0 && sed -i 's#^SELINUX=.*#SELINUX=disabled#' /etc/selinux/config
systemctl stop firewalld && systemctl disable firewalld
- hosts文件
修改为自己觉得容易辨认的主机名
#修改主机名
hostnamectl set-hostname tmp-master01
echo “ tmp-master01” >/etc/hostname
#修改hosts文件
cat >> /etc/hosts << EOF
10.100.10.10 tmp-master
10.100.10.11 tmp-node01
10.100.10.12 tmp-node02
EOF
- 关闭swap
#临时关闭swap
swapoff -a
#永久关闭swap
需要vim /etc/fstab，注释掉swap相关的内容
#或者可以使用sed注释swap，每个虚拟机内容可能不一样，下面只是举例
sed -i 's$/dev/mapper/centos-swap$#/dev/mapper/centos-swap$g' /etc/fstab
- ip转发
echo 1 >/proc/sys/net/ipv4/ip_forward
cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1
vm.swappiness=0
EOF
sysctl -p /etc/sysctl.d/k8s.conf
- 打开limit限制
ulimit -n 65536
sed -i '$i * hard nofile 65536' /etc/security/limits.conf
sed -i '$i * soft nofile 65536' /etc/security/limits.conf
- 加载ipvs模块
在所有的Kubernetes节点执行以下脚本（若内核小于4.19替换nf_conntrack为nf_conntrack_ipv4）:
cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
modprobe -- ip_vs323
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack
EOF
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack
yum install ipset ipvsadm -y
-
基础软件
这是我常用的一些基础软件，根据自己的需要决定是否安装
yum install iotop tcpdump htop sysstat telnet -y
-
更新内核
- 更新yum源
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
- 查看可安装的内核
yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
- 下载内核
长期维护版
yum --enablerepo=elrepo-kernel install kernel-lt -y
- 查看安装的内核
cat /boot/grub2/grub.cfg | grep menuentry
查看安装的内核版本
- 切换默认启动内核
##版本以上面查到的版本为准
grub2-set-default 'CentOS Linux (5.4.93-1.el7.elrepo.x86_64) 7 (Core)'
grub2-editenv list
- 重启服务器后查看
# 重启服务器
shutdown -r now
# uname -a
Linux gs-k8s-master01 5.4.93-1.el7.elrepo.x86_64 #1 SMP Tue Jan 26 10:21:47 EST 2021 x86_64 x86_64 x86_64 GNU/Linux
3 安装docker
- 安装yum源
wget https://mirrors.cloud.tencent.com/docker-ce/linux/centos/docker-ce.repo -P /etc/yum.repos.d
- 安装
# 卸载(如果之前没有安装docker，则忽略)
yum -y remove docker*
#删除所有的镜像、容器、数据卷、配置文件等
sudo rm -rf /var/lib/docker
#查看可安装版本
yum list docker-ce --showduplicates
# 安装指定版本
yum install docker-ce-19.03.14-3.el7 -y
- 修改配置文件
mkdir /etc/docker -p
cat > /etc/docker/daemon.json <<EOF
{
"registry-mirrors": ["[https://registry.docker-cn.com","https://kfp63jaj.mirror.aliyuncs.com"\],](https://registry.docker-cn.com)
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-level": "debug",
"log-opts": {
"max-size": "800m"
},
"insecure-registries" : ["harbor.xxx.com" ] ##选填
}
EOF
-
修改数据存储目录，并启动
默认的存储目录是根目录，因此需要将docker数据存储在大的磁盘内
#这里以/data为大的挂载磁盘为例
mkdir /data/docker -p
ln -s /data/docker/ /var/lib
#启动docker
systemctl restart docker
systemctl enable docker
#检查docker版本
docker version
#检查docker数据存储目录
docker info | grep "Docker Root Dir"
4 安装kubernetes
1 master安装
1 安装软件
- 下载
cat > /etc/yum.repos.d/kubernetes.repo<<EOF
[kubernetes]
name=Kubernetes Repo
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
gpgcheck=0
enabled=1
EOF
#可以修改为自己想要的版本
yum install kubelet-1.18.15-0 -y
yum install kubectl-1.18.15-0 kubeadm-1.18.15-0 -y
systemctl enable kubelet
- 拉取所需镜像
使用阿里云镜像拉取
#!/bin/bash
for i in `kubeadm config images list`; do
imageName=${i#k8s.gcr.io/}
docker pull registry.aliyuncs.com/google_containers/$imageName
docker tag registry.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
docker rmi registry.aliyuncs.com/google_containers/$imageName
done;
2 启动master
- 配置文件
kubeadm config print init-defaults > kubeadm-config.yaml
修改为以下内容
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: 10.16.116.46 #修改为本机IP
bindPort: 6443
nodeRegistration:
criSocket: /var/run/dockershim.sock
name: gs-k8s-master01
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: v1.18.15
networking:
dnsDomain: cluster.local
##增加flannel需要的网段
podSubnet: "10.244.0.0/16"
serviceSubnet: 10.96.0.0/12
scheduler: {}
---
## 添加ipvs模块
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
featureGates:
SupportIPVSProxyMode: true
mode: ipvs
- 安装
kubeadm init --config=kubeadm-config.yaml | tee kubeadm-init.log
执行成功后最后的信息为
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 10.16.116.46:6443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:8e0bf5f529ad98a9fe7597a91a461a447af8d5593411173e6227a2ee46a674b4
- 执行以下命令，以操作集群
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config
3 常见问题
- 回退集群
如果初始化失败，需要重装，可以通过kubeadm reset --force 重置之前 kubeadm init 命令的执行结果，恢复一个干净的环境
kubeadm reset --force
- 回退集群后安装报错
error: You must be logged in to the server (Unauthorized)
将集群彻底删除干净
rm -rf /etc/kubernetes
rm -rf /var/lib/etcd
rm -rf /var/lib/kubelet/
rm -rf ~/.kube
3 去除master节点污点
如果想要master节点也能部署服务，可以去除master的污点(一般单机k8s才使用)
kubectl taint nodes --all node-role.kubernetes.io/master-
4 部署网络插件
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
如果访问不了网站，可以使用下面的文件直接部署flannel
---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
name: psp.flannel.unprivileged
annotations:
seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:
privileged: false
volumes:
- configMap
- secret
- emptyDir
- hostPath
allowedHostPaths:
- pathPrefix: "/etc/cni/net.d"
- pathPrefix: "/etc/kube-flannel"
- pathPrefix: "/run/flannel"
readOnlyRootFilesystem: false
# Users and groups
runAsUser:
rule: RunAsAny
supplementalGroups:
rule: RunAsAny
fsGroup:
rule: RunAsAny
# Privilege Escalation
allowPrivilegeEscalation: false
defaultAllowPrivilegeEscalation: false
# Capabilities
allowedCapabilities: ['NET_ADMIN']
defaultAddCapabilities: []
requiredDropCapabilities: []
# Host namespaces
hostPID: false
hostIPC: false
hostNetwork: true
hostPorts:
- min: 0
max: 65535
# SELinux
seLinux:
# SELinux is unused in CaaSP
rule: 'RunAsAny'
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: flannel
rules:
- apiGroups: ['extensions']
resources: ['podsecuritypolicies']
verbs: ['use']
resourceNames: ['psp.flannel.unprivileged']
- apiGroups:
- ""
resources:
- pods
verbs:
- get
- apiGroups:
- ""
resources:
- nodes
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes/status
verbs:
- patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: flannel
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: flannel
subjects:
- kind: ServiceAccount
name: flannel
namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: flannel
namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
name: kube-flannel-cfg
namespace: kube-system
labels:
tier: node
app: flannel
data:
cni-conf.json: |
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
net-conf.json: |
{
"Network": "10.244.0.0/16",
"Backend": {
"Type": "vxlan"
}
}
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds-amd64
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
- key: kubernetes.io/arch
operator: In
values:
- amd64
hostNetwork: true
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.12.0-amd64
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.12.0-amd64
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds-arm64
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
- key: kubernetes.io/arch
operator: In
values:
- arm64
hostNetwork: true
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.12.0-arm64
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.12.0-arm64
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds-arm
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
- key: kubernetes.io/arch
operator: In
values:
- arm
hostNetwork: true
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.12.0-arm
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.12.0-arm
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds-ppc64le
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
- key: kubernetes.io/arch
operator: In
values:
- ppc64le
hostNetwork: true
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.12.0-ppc64le
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.12.0-ppc64le
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds-s390x
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
- key: kubernetes.io/arch
operator: In
values:
- s390x
hostNetwork: true
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.12.0-s390x
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.12.0-s390x
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
kubectl apply -f flannel.yaml
5 验证部署是否成功
# kubectl get node
NAME STATUS ROLES AGE VERSION
gs-k8s-master01 Ready master 106m v1.18.15
# kubectl get pod -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-66bff467f8-5g8g6 1/1 Running 0 106m
kube-system coredns-66bff467f8-kjdvp 1/1 Running 0 106m
kube-system etcd-gs-k8s-master01 1/1 Running 0 106m
kube-system kube-apiserver-gs-k8s-master01 1/1 Running 0 106m
kube-system kube-controller-manager-gs-k8s-master01 1/1 Running 0 106m
kube-system kube-flannel-ds-amd64-jz8nl 1/1 Running 0 105m
kube-system kube-proxy-9wxnn 1/1 Running 0 106m
kube-system kube-scheduler-gs-k8s-master01 1/1 Running 0 106m
2 node节点部署
1 安装软件
- 下载
cat > /etc/yum.repos.d/kubernetes.repo<<EOF
[kubernetes]
name=Kubernetes Repo
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
gpgcheck=0
enabled=1
EOF
yum install kubelet-1.18.15-0 -y
yum install kubectl-1.18.15-0 kubeadm-1.18.15-0 -y
systemctl enable kubelet
- 拉取所需镜像
使用阿里云镜像拉取
imageName=kube-proxy:v1.18.15
docker pull registry.aliyuncs.com/google_containers/$imageName
docker tag registry.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
docker rmi registry.aliyuncs.com/google_containers/$imageName
imageName=pause:3.2
docker pull registry.aliyuncs.com/google_containers/$imageName
docker tag registry.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
docker rmi registry.aliyuncs.com/google_containers/$imageName
2 加入master
这是master执行安装完后留存 的信息，在node节点直接执行
kubeadm join 10.16.116.46:6443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:8e0bf5f529ad98a9fe7597a91a461a447af8d5593411173e6227a2ee46a674b4
3 验证
master节点上执行
kubectl get node
3 小技巧
自动补全，直接使用tab键就可以补全k8s的相关命令
yum -y install bash-completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc
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