一、前置知识点

1.1 生产环境可部署Kubernetes集群的两种方式

目前生产部署Kubernetes集群主要有两种方式:

  • 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。

官方地址:https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm/

  • 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。

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 安装要求

在开始之前,部署Kubernetes集群机器需要满足以下几个条件:

  • 一台或多台机器,操作系统 CentOS7.x-86_x64
  • 硬件配置:2GB或更多RAM,2个CPU或更多CPU,硬盘30GB或更多
  • 可以访问外网,需要拉取镜像,如果服务器不能上网,需要提前下载镜像并导入节点
  • 禁止swap分区

1.3 准备环境

软件环境:

软件 版本
操作系统 CentOS7.8_x64 (mini)
Docker 19-ce
Kubernetes 1.18

服务器整体规划:

角色 IP 组件
k8s-master1 192.168.31.71 kube-apiserver,kube-controller-manager,kube-scheduler,etcd
k8s-master2 192.168.31.74 kube-apiserver,kube-controller-manager,kube-scheduler
k8s-node1 192.168.31.72 kubelet,kube-proxy,docker etcd
k8s-node2 192.168.31.73 kubelet,kube-proxy,docker,etcd
Load Balancer(Master) 192.168.31.81 ,192.168.31.88 (VIP) Nginx L4
Load Balancer(Backup) 192.168.31. 82 Nginx L4

须知:考虑到有些朋友电脑配置较低,这么多虚拟机跑不动,所以这一套高可用集群分两部分实施,先部署一套单Master架构(192.168.31.71/72/73),再扩容为多Master架构(上述规划),顺便熟悉下Master扩容流程。

单Master架构图:

单Master服务器规划:

角色 IP 组件
k8s-master 192.168.31.71 kube-apiserver,kube-controller-manager,kube-scheduler,etcd
k8s-node1 192.168.31.72 kubelet,kube-proxy,docker etcd
k8s-node2 192.168.31.73 kubelet,kube-proxy,docker,etcd

1.4 操作系统初始化配置

# 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld # 关闭selinux
sed -i 's/enforcing/disabled/' /etc/selinux/config # 永久
setenforce # 临时 # 关闭swap
swapoff -a # 临时
sed -ri 's/.*swap.*/#&/' /etc/fstab # 永久 # 根据规划设置主机名
hostnamectl set-hostname <hostname> # 在master添加hosts
cat >> /etc/hosts << EOF
192.168.31.71 k8s-master
192.168.31.72 k8s-node1
192.168.31.73 k8s-node2
EOF # 将桥接的IPv4流量传递到iptables的链
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables =
net.bridge.bridge-nf-call-iptables =
EOF
sysctl --system # 生效 # 时间同步
yum install ntpdate -y
ntpdate time.windows.com

二、部署Etcd集群

Etcd 是一个分布式键值存储系统,Kubernetes使用Etcd进行数据存储,所以先准备一个Etcd数据库,为解决Etcd单点故障,应采用集群方式部署,这里使用3台组建集群,可容忍1台机器故障,当然,你也可以使用5台组建集群,可容忍2台机器故障。

节点名称 IP
etcd-1 192.168.31.71
etcd-2 192.168.31.72
etcd-3 192.168.31.73

注:为了节省机器,这里与K8s节点机器复用。也可以独立于k8s集群之外部署,只要apiserver能连接到就行。

2.1 准备cfssl证书生成工具

cfssl是一个开源的证书管理工具,使用json文件生成证书,相比openssl更方便使用。

找任意一台服务器操作,这里用Master节点。

wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

2.2 生成Etcd证书

1. 自签证书颁发机构(CA)

创建工作目录:

mkdir -p ~/TLS/{etcd,k8s}

cd TLS/etcd

自签CA:

cat > ca-config.json << EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"www": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF cat > ca-csr.json << EOF
{
"CN": "etcd CA",
"key": {
"algo": "rsa",
"size":
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing"
}
]
}
EOF

生成证书:

cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

ls *pem
ca-key.pem ca.pem

2. 使用自签CA签发Etcd HTTPS证书

创建证书申请文件:

cat > server-csr.json << EOF
{
"CN": "etcd",
"hosts": [
"192.168.31.71",
"192.168.31.72",
"192.168.31.73"
],
"key": {
"algo": "rsa",
"size":
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing"
}
]
}
EOF

注:上述文件hosts字段中IP为所有etcd节点的集群内部通信IP,一个都不能少!为了方便后期扩容可以多写几个预留的IP。

生成证书:

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

ls server*pem
server-key.pem server.pem

2.3 从Github下载二进制文件

下载地址:https://github.com/etcd-io/etcd/releases/download/v3.4.9/etcd-v3.4.9-linux-amd64.tar.gz

2.4 部署Etcd集群

以下在节点1上操作,为简化操作,待会将节点1生成的所有文件拷贝到节点2和节点3.

1. 创建工作目录并解压二进制包

mkdir /opt/etcd/{bin,cfg,ssl} -p
tar zxvf etcd-v3.4.9-linux-amd64.tar.gz
mv etcd-v3.4.9-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/

2. 创建etcd配置文件

cat > /opt/etcd/cfg/etcd.conf << EOF
#[Member]
ETCD_NAME="etcd-1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.31.71:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.31.71:2379" #[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.31.71:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.31.71:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.31.71:2380,etcd-2=https://192.168.31.72:2380,etcd-3=https://192.168.31.73:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
  • ETCD_NAME:节点名称,集群中唯一
  • ETCD_DATA_DIR:数据目录
  • ETCD_LISTEN_PEER_URLS:集群通信监听地址
  • ETCD_LISTEN_CLIENT_URLS:客户端访问监听地址
  • ETCD_INITIAL_ADVERTISE_PEER_URLS:集群通告地址
  • ETCD_ADVERTISE_CLIENT_URLS:客户端通告地址
  • ETCD_INITIAL_CLUSTER:集群节点地址
  • ETCD_INITIAL_CLUSTER_TOKEN:集群Token
  • ETCD_INITIAL_CLUSTER_STATE:加入集群的当前状态,new是新集群,existing表示加入已有集群

3. systemd管理etcd

cat > /usr/lib/systemd/system/etcd.service << EOF
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target [Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd.conf
ExecStart=/opt/etcd/bin/etcd \
--cert-file=/opt/etcd/ssl/server.pem \
--key-file=/opt/etcd/ssl/server-key.pem \
--peer-cert-file=/opt/etcd/ssl/server.pem \
--peer-key-file=/opt/etcd/ssl/server-key.pem \
--trusted-ca-file=/opt/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/opt/etcd/ssl/ca.pem \
--logger=zap
Restart=on-failure
LimitNOFILE= [Install]
WantedBy=multi-user.target
EOF

4. 拷贝刚才生成的证书

把刚才生成的证书拷贝到配置文件中的路径:

cp ~/TLS/etcd/ca*pem ~/TLS/etcd/server*pem /opt/etcd/ssl/

5. 启动并设置开机启动

systemctl daemon-reload
systemctl start etcd
systemctl enable etcd

6. 将上面节点1所有生成的文件拷贝到节点2和节点3

scp -r /opt/etcd/ root@192.168.31.72:/opt/
scp /usr/lib/systemd/system/etcd.service root@192.168.31.72:/usr/lib/systemd/system/
scp -r /opt/etcd/ root@192.168.31.73:/opt/
scp /usr/lib/systemd/system/etcd.service root@192.168.31.73:/usr/lib/systemd/system/

然后在节点2和节点3分别修改etcd.conf配置文件中的节点名称和当前服务器IP:

vi /opt/etcd/cfg/etcd.conf
#[Member]
ETCD_NAME="etcd-1" # 修改此处,节点2改为etcd-,节点3改为etcd-
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.31.71:2380" # 修改此处为当前服务器IP
ETCD_LISTEN_CLIENT_URLS="https://192.168.31.71:2379" # 修改此处为当前服务器IP #[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.31.71:2380" # 修改此处为当前服务器IP
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.31.71:2379" # 修改此处为当前服务器IP
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.31.71:2380,etcd-2=https://192.168.31.72:2380,etcd-3=https://192.168.31.73:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

最后启动etcd并设置开机启动,同上。

7. 查看集群状态

ETCDCTL_API= /opt/etcd/bin/etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.31.71:2379,https://192.168.31.72:2379,https://192.168.31.73:2379" endpoint health

https://192.168.31.71:2379 is healthy: successfully committed proposal: took = 8.154404ms
https://192.168.31.73:2379 is healthy: successfully committed proposal: took = 9.044117ms
https://192.168.31.72:2379 is healthy: successfully committed proposal: took = 10.000825ms

如果输出上面信息,就说明集群部署成功。如果有问题第一步先看日志:/var/log/message 或 journalctl -u etcd

三、安装Docker

下载地址:https://download.docker.com/linux/static/stable/x86_64/docker-19.03.9.tgz

以下在所有节点操作。这里采用二进制安装,用yum安装也一样。

3.1 解压二进制包

tar zxvf docker-19.03..tgz
mv docker/* /usr/bin

3.2 systemd管理docker

cat > /usr/lib/systemd/system/docker.service << EOF
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target [Service]
Type=notify
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=
StartLimitInterval=60s [Install]
WantedBy=multi-user.target
EOF

3.3 创建配置文件

mkdir /etc/docker
cat > /etc/docker/daemon.json << EOF
{
"registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF
  • registry-mirrors 阿里云镜像加速器

3.4 启动并设置开机启动

systemctl daemon-reload
systemctl start docker
systemctl enable docker

四、部署Master Node

如果你在学习中遇到问题或者文档有误可联系阿良~ 微信: init1024

4.1 生成kube-apiserver证书

1. 自签证书颁发机构(CA)

cat > ca-config.json << EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
cat > ca-csr.json << EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size":
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "k8s",
"OU": "System"
}
]
}
EOF

生成证书:

cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

ls *pem
ca-key.pem ca.pem

2. 使用自签CA签发kube-apiserver HTTPS证书

创建证书申请文件:

cd TLS/k8s
cat > server-csr.json << EOF
{
"CN": "kubernetes",
"hosts": [
"10.0.0.1",
"127.0.0.1",
"192.168.31.71",
"192.168.31.72",
"192.168.31.73",
"192.168.31.74",
"192.168.31.81",
"192.168.31.82",
"192.168.31.88",
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size":
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF

注:上述文件hosts字段中IP为所有Master/LB/VIP IP,一个都不能少!为了方便后期扩容可以多写几个预留的IP。

生成证书:

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

ls server*pem
server-key.pem server.pem

4.2 从Github下载二进制文件

下载地址: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.18.md#v1183

注:打开链接你会发现里面有很多包,下载一个server包就够了,包含了Master和Worker Node二进制文件。

4.3 解压二进制包

mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}
tar zxvf kubernetes-server-linux-amd64.tar.gz
cd kubernetes/server/bin
cp kube-apiserver kube-scheduler kube-controller-manager /opt/kubernetes/bin
cp kubectl /usr/bin/

4.4 部署kube-apiserver

1. 创建配置文件

cat > /opt/kubernetes/cfg/kube-apiserver.conf << EOF
KUBE_APISERVER_OPTS="--logtostderr=false \\
--v= \\
--log-dir=/opt/kubernetes/logs \\
--etcd-servers=https://192.168.31.71:2379,https://192.168.31.72:2379,https://192.168.31.73:2379 \\
--bind-address=192.168.31.71 \\
--secure-port= \\
--advertise-address=192.168.31.71 \\
--allow-privileged=true \\
--service-cluster-ip-range=10.0.0.0/ \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \\
--authorization-mode=RBAC,Node \\
--enable-bootstrap-token-auth=true \\
--token-auth-file=/opt/kubernetes/cfg/token.csv \\
--service-node-port-range=- \\
--kubelet-client-certificate=/opt/kubernetes/ssl/server.pem \\
--kubelet-client-key=/opt/kubernetes/ssl/server-key.pem \\
--tls-cert-file=/opt/kubernetes/ssl/server.pem \\
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \\
--client-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--etcd-cafile=/opt/etcd/ssl/ca.pem \\
--etcd-certfile=/opt/etcd/ssl/server.pem \\
--etcd-keyfile=/opt/etcd/ssl/server-key.pem \\
--audit-log-maxage= \\
--audit-log-maxbackup= \\
--audit-log-maxsize= \\
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"
EOF

注:上面两个\ \ 第一个是转义符,第二个是换行符,使用转义符是为了使用EOF保留换行符。

  • –logtostderr:启用日志
  • —v:日志等级
  • –log-dir:日志目录
  • –etcd-servers:etcd集群地址
  • –bind-address:监听地址
  • –secure-port:https安全端口
  • –advertise-address:集群通告地址
  • –allow-privileged:启用授权
  • –service-cluster-ip-range:Service虚拟IP地址段
  • –enable-admission-plugins:准入控制模块
  • –authorization-mode:认证授权,启用RBAC授权和节点自管理
  • –enable-bootstrap-token-auth:启用TLS bootstrap机制
  • –token-auth-file:bootstrap token文件
  • –service-node-port-range:Service nodeport类型默认分配端口范围
  • –kubelet-client-xxx:apiserver访问kubelet客户端证书
  • –tls-xxx-file:apiserver https证书
  • –etcd-xxxfile:连接Etcd集群证书
  • –audit-log-xxx:审计日志

2. 拷贝刚才生成的证书

把刚才生成的证书拷贝到配置文件中的路径:

cp ~/TLS/k8s/ca*pem ~/TLS/k8s/server*pem /opt/kubernetes/ssl/

3. 启用 TLS Bootstrapping 机制

TLS Bootstraping:Master apiserver启用TLS认证后,Node节点kubelet和kube-proxy要与kube-apiserver进行通信,必须使用CA签发的有效证书才可以,当Node节点很多时,这种客户端证书颁发需要大量工作,同样也会增加集群扩展复杂度。为了简化流程,Kubernetes引入了TLS bootstraping机制来自动颁发客户端证书,kubelet会以一个低权限用户自动向apiserver申请证书,kubelet的证书由apiserver动态签署。所以强烈建议在Node上使用这种方式,目前主要用于kubelet,kube-proxy还是由我们统一颁发一个证书。

TLS bootstraping 工作流程:

创建上述配置文件中token文件:

cat > /opt/kubernetes/cfg/token.csv << EOF
c47ffb939f5ca36231d9e3121a252940,kubelet-bootstrap,,"system:node-bootstrapper"
EOF

格式:token,用户名,UID,用户组

token也可自行生成替换:

head -c  /dev/urandom | od -An -t x | tr -d ' '

4. systemd管理apiserver

cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes [Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-apiserver.conf
ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure [Install]
WantedBy=multi-user.target
EOF

5. 启动并设置开机启动

systemctl daemon-reload
systemctl start kube-apiserver
systemctl enable kube-apiserver

6. 授权kubelet-bootstrap用户允许请求证书

kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap

4.5 部署kube-controller-manager

1. 创建配置文件

cat > /opt/kubernetes/cfg/kube-controller-manager.conf << EOF
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \\
--v= \\
--log-dir=/opt/kubernetes/logs \\
--leader-elect=true \\
--master=127.0.0.1: \\
--bind-address=127.0.0.1 \\
--allocate-node-cidrs=true \\
--cluster-cidr=10.244.0.0/ \\
--service-cluster-ip-range=10.0.0.0/ \\
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--root-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--experimental-cluster-signing-duration=87600h0m0s"
EOF
  • –master:通过本地非安全本地端口8080连接apiserver。
  • –leader-elect:当该组件启动多个时,自动选举(HA)
  • –cluster-signing-cert-file/–cluster-signing-key-file:自动为kubelet颁发证书的CA,与apiserver保持一致

2. systemd管理controller-manager

cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes [Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-controller-manager.conf
ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure [Install]
WantedBy=multi-user.target
EOF

3. 启动并设置开机启动

systemctl daemon-reload
systemctl start kube-controller-manager
systemctl enable kube-controller-manager

4.6 部署kube-scheduler

1. 创建配置文件

cat > /opt/kubernetes/cfg/kube-scheduler.conf << EOF
KUBE_SCHEDULER_OPTS="--logtostderr=false \
--v= \
--log-dir=/opt/kubernetes/logs \
--leader-elect \
--master=127.0.0.1: \
--bind-address=127.0.0.1"
EOF
  • –master:通过本地非安全本地端口8080连接apiserver。
  • –leader-elect:当该组件启动多个时,自动选举(HA)

2. systemd管理scheduler

cat > /usr/lib/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes [Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-scheduler.conf
ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure [Install]
WantedBy=multi-user.target
EOF

3. 启动并设置开机启动

systemctl daemon-reload
systemctl start kube-scheduler
systemctl enable kube-scheduler

4. 查看集群状态

所有组件都已经启动成功,通过kubectl工具查看当前集群组件状态:

kubectl get cs
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd- Healthy {"health":"true"}
etcd- Healthy {"health":"true"}
etcd- Healthy {"health":"true"}

如上输出说明Master节点组件运行正常。

五、部署Worker Node

如果你在学习中遇到问题或者文档有误可联系阿良~ 微信: init1024

下面还是在Master Node上操作,即同时作为Worker Node

5.1 创建工作目录并拷贝二进制文件

在所有worker node创建工作目录:

mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs} 

从master节点拷贝:

cd kubernetes/server/bin
cp kubelet kube-proxy /opt/kubernetes/bin # 本地拷贝

5.2 部署kubelet

1. 创建配置文件

cat > /opt/kubernetes/cfg/kubelet.conf << EOF
KUBELET_OPTS="--logtostderr=false \\
--v= \\
--log-dir=/opt/kubernetes/logs \\
--hostname-override=k8s-master \\
--network-plugin=cni \\
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \\
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \\
--config=/opt/kubernetes/cfg/kubelet-config.yml \\
--cert-dir=/opt/kubernetes/ssl \\
--pod-infra-container-image=lizhenliang/pause-amd64:3.0"
EOF
  • –hostname-override:显示名称,集群中唯一
  • –network-plugin:启用CNI
  • –kubeconfig:空路径,会自动生成,后面用于连接apiserver
  • –bootstrap-kubeconfig:首次启动向apiserver申请证书
  • –config:配置参数文件
  • –cert-dir:kubelet证书生成目录
  • –pod-infra-container-image:管理Pod网络容器的镜像

2. 配置参数文件

cat > /opt/kubernetes/cfg/kubelet-config.yml << EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 0.0.0.0
port:
readOnlyPort:
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local
failSwapOn: false
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /opt/kubernetes/ssl/ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
evictionHard:
imagefs.available: %
memory.available: 100Mi
nodefs.available: %
nodefs.inodesFree: %
maxOpenFiles:
maxPods:
EOF

3. 生成bootstrap.kubeconfig文件

KUBE_APISERVER="https://192.168.31.71:6443" # apiserver IP:PORT
TOKEN="c47ffb939f5ca36231d9e3121a252940" # 与token.csv里保持一致 # 生成 kubelet bootstrap kubeconfig 配置文件
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=bootstrap.kubeconfig
kubectl config set-credentials "kubelet-bootstrap" \
--token=${TOKEN} \
--kubeconfig=bootstrap.kubeconfig
kubectl config set-context default \
--cluster=kubernetes \
--user="kubelet-bootstrap" \
--kubeconfig=bootstrap.kubeconfig
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

拷贝到配置文件路径:

cp bootstrap.kubeconfig /opt/kubernetes/cfg

4. systemd管理kubelet

cat > /usr/lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
After=docker.service [Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet.conf
ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS
Restart=on-failure
LimitNOFILE= [Install]
WantedBy=multi-user.target
EOF

5. 启动并设置开机启动

systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet

5.3 批准kubelet证书申请并加入集群

# 查看kubelet证书请求
kubectl get csr
NAME AGE SIGNERNAME REQUESTOR CONDITION
node-csr-uCEGPOIiDdlLODKts8J658HrFq9CZ--K6M4G7bjhk8A 6m3s kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Pending # 批准申请
kubectl certificate approve node-csr-uCEGPOIiDdlLODKts8J658HrFq9CZ--K6M4G7bjhk8A # 查看节点
kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master NotReady <none> 7s v1.18.3

注:由于网络插件还没有部署,节点会没有准备就绪 NotReady

5.4 部署kube-proxy

1. 创建配置文件

cat > /opt/kubernetes/cfg/kube-proxy.conf << EOF
KUBE_PROXY_OPTS="--logtostderr=false \\
--v= \\
--log-dir=/opt/kubernetes/logs \\
--config=/opt/kubernetes/cfg/kube-proxy-config.yml"
EOF

2. 配置参数文件

cat > /opt/kubernetes/cfg/kube-proxy-config.yml << EOF
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
metricsBindAddress: 0.0.0.0:
clientConnection:
kubeconfig: /opt/kubernetes/cfg/kube-proxy.kubeconfig
hostnameOverride: k8s-master
clusterCIDR: 10.0.0.0/
EOF

3. 生成kube-proxy.kubeconfig文件

生成kube-proxy证书:

# 切换工作目录
cd TLS/k8s # 创建证书请求文件
cat > kube-proxy-csr.json << EOF
{
"CN": "system:kube-proxy",
"hosts": [],
"key": {
"algo": "rsa",
"size":
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF # 生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy ls kube-proxy*pem
kube-proxy-key.pem kube-proxy.pem

生成kubeconfig文件:

KUBE_APISERVER="https://192.168.31.71:6443"

kubectl config set-cluster kubernetes \
--certificate-authority=/opt/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy \
--client-certificate=./kube-proxy.pem \
--client-key=./kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-context default \
--cluster=kubernetes \
--user=kube-proxy \
--kubeconfig=kube-proxy.kubeconfig
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

拷贝到配置文件指定路径:

cp kube-proxy.kubeconfig /opt/kubernetes/cfg/

4. systemd管理kube-proxy

cat > /usr/lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Proxy
After=network.target [Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-proxy.conf
ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS
Restart=on-failure
LimitNOFILE= [Install]
WantedBy=multi-user.target
EOF

5. 启动并设置开机启动

systemctl daemon-reload
systemctl start kube-proxy
systemctl enable kube-proxy

5.5 部署CNI网络

先准备好CNI二进制文件:

下载地址:https://github.com/containernetworking/plugins/releases/download/v0.8.6/cni-plugins-linux-amd64-v0.8.6.tgz

解压二进制包并移动到默认工作目录:

mkdir /opt/cni/bin
tar zxvf cni-plugins-linux-amd64-v0.8.6.tgz -C /opt/cni/bin

部署CNI网络:

wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
sed -i -r "s#quay.io/coreos/flannel:.*-amd64#lizhenliang/flannel:v0.12.0-amd64#g" kube-flannel.yml

默认镜像地址无法访问,修改为docker hub镜像仓库。

kubectl apply -f kube-flannel.yml

kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
kube-flannel-ds-amd64-2pc95 / Running 72s kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master Ready <none> 41m v1.18.3

部署好网络插件,Node准备就绪。

5.6 授权apiserver访问kubelet

cat > apiserver-to-kubelet-rbac.yaml << EOF
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:kube-apiserver-to-kubelet
rules:
- apiGroups:
- ""
resources:
- nodes/proxy
- nodes/stats
- nodes/log
- nodes/spec
- nodes/metrics
- pods/log
verbs:
- "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:kube-apiserver
namespace: ""
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:kube-apiserver-to-kubelet
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: User
name: kubernetes
EOF kubectl apply -f apiserver-to-kubelet-rbac.yaml

5.7 新增加Worker Node

1. 拷贝已部署好的Node相关文件到新节点

在Master节点将Worker Node涉及文件拷贝到新节点192.168.31.72/73

scp /opt/kubernetes root@192.168.31.72:/opt/

scp -r /usr/lib/systemd/system/{kubelet,kube-proxy}.service root@192.168.31.72:/usr/lib/systemd/system

scp -r /opt/cni/ root@192.168.31.72:/opt/

scp /opt/kubernetes/ssl/ca.pem root@192.168.31.72:/opt/kubernetes/ssl

2. 删除kubelet证书和kubeconfig文件

rm /opt/kubernetes/cfg/kubelet.kubeconfig
rm -f /opt/kubernetes/ssl/kubelet*

注:这几个文件是证书申请审批后自动生成的,每个Node不同,必须删除重新生成。

3. 修改主机名

vi /opt/kubernetes/cfg/kubelet.conf
--hostname-override=k8s-node1 vi /opt/kubernetes/cfg/kube-proxy-config.yml
hostnameOverride: k8s-node1

4. 启动并设置开机启动

systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet
systemctl start kube-proxy
systemctl enable kube-proxy

5. 在Master上批准新Node kubelet证书申请

kubectl get csr
NAME AGE SIGNERNAME REQUESTOR CONDITION
node-csr-4zTjsaVSrhuyhIGqsefxzVoZDCNKei-aE2jyTP81Uro 89s kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Pending kubectl certificate approve node-csr-4zTjsaVSrhuyhIGqsefxzVoZDCNKei-aE2jyTP81Uro

6. 查看Node状态

kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master Ready <none> 65m v1.18.3
k8s-node1 Ready <none> 12m v1.18.3
k8s-node2 Ready <none> 81s v1.18.3

Node2(192.168.31.73 )节点同上。记得修改主机名!

六、部署Dashboard和CoreDNS

6.1 部署Dashboard

$ wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta8/aio/deploy/recommended.yaml

默认Dashboard只能集群内部访问,修改Service为NodePort类型,暴露到外部:

vi recommended.yaml
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
spec:
ports:
- port:
targetPort:
nodePort:
type: NodePort
selector:
k8s-app: kubernetes-dashboard kubectl apply -f recommended.yaml
kubectl get pods,svc -n kubernetes-dashboard
NAME READY STATUS RESTARTS AGE
pod/dashboard-metrics-scraper-694557449d-z8gfb / Running 2m18s
pod/kubernetes-dashboard-9774cc786-q2gsx / Running 2m19s NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/dashboard-metrics-scraper ClusterIP 10.0.0.141 <none> /TCP 2m19s
service/kubernetes-dashboard NodePort 10.0.0.239 <none> :/TCP 2m19s

访问地址:https://NodeIP:30001

创建service account并绑定默认cluster-admin管理员集群角色:

kubectl create serviceaccount dashboard-admin -n kube-system
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')

使用输出的token登录Dashboard。

6.2 部署CoreDNS

CoreDNS用于集群内部Service名称解析。

kubectl apply -f coredns.yaml

kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-5ffbfd976d-j6shb / Running 32s
kube-flannel-ds-amd64-2pc95 / Running 38m
kube-flannel-ds-amd64-7qhdx / Running 15m
kube-flannel-ds-amd64-99cr8 / Running 26m

DNS解析测试:

kubectl run -it --rm dns-test --image=busybox:1.28. sh
If you don't see a command prompt, try pressing enter. / # nslookup kubernetes
Server: 10.0.0.2
Address : 10.0.0.2 kube-dns.kube-system.svc.cluster.local Name: kubernetes
Address : 10.0.0.1 kubernetes.default.svc.cluster.local

解析没问题。

七、高可用架构(扩容多Master架构)

Kubernetes作为容器集群系统,通过健康检查+重启策略实现了Pod故障自我修复能力,通过调度算法实现将Pod分布式部署,并保持预期副本数,根据Node失效状态自动在其他Node拉起Pod,实现了应用层的高可用性。

针对Kubernetes集群,高可用性还应包含以下两个层面的考虑:Etcd数据库的高可用性和Kubernetes Master组件的高可用性。 而Etcd我们已经采用3个节点组建集群实现高可用,本节将对Master节点高可用进行说明和实施。

Master节点扮演着总控中心的角色,通过不断与工作节点上的Kubelet和kube-proxy进行通信来维护整个集群的健康工作状态。如果Master节点故障,将无法使用kubectl工具或者API做任何集群管理。

Master节点主要有三个服务kube-apiserver、kube-controller-manager和kube-scheduler,其中kube-controller-manager和kube-scheduler组件自身通过选择机制已经实现了高可用,所以Master高可用主要针对kube-apiserver组件,而该组件是以HTTP API提供服务,因此对他高可用与Web服务器类似,增加负载均衡器对其负载均衡即可,并且可水平扩容。

多Master架构图:

7.1 安装Docker

同上,不再赘述。

7.2 部署Master2 Node(192.168.31.74)

Master2 与已部署的Master1所有操作一致。所以我们只需将Master1所有K8s文件拷贝过来,再修改下服务器IP和主机名启动即可。

1. 创建etcd证书目录

在Master2创建etcd证书目录:

mkdir -p /opt/etcd/ssl

2. 拷贝文件(Master1操作)

拷贝Master1上所有K8s文件和etcd证书到Master2:

scp -r /opt/kubernetes root@192.168.31.74:/opt
scp -r /opt/cni/ root@192.168.31.74:/opt
scp -r /opt/etcd/ssl root@192.168.31.74:/opt/etcd
scp /usr/lib/systemd/system/kube* root@192.168.31.74:/usr/lib/systemd/system
scp /usr/bin/kubectl root@192.168.31.74:/usr/bin

3. 删除证书文件

删除kubelet证书和kubeconfig文件:

rm -f /opt/kubernetes/cfg/kubelet.kubeconfig
rm -f /opt/kubernetes/ssl/kubelet*

4. 修改配置文件IP和主机名

修改apiserver、kubelet和kube-proxy配置文件为本地IP:

vi /opt/kubernetes/cfg/kube-apiserver.conf
...
--bind-address=192.168.31.74 \
--advertise-address=192.168.31.74 \
... vi /opt/kubernetes/cfg/kubelet.conf
--hostname-override=k8s-master2 vi /opt/kubernetes/cfg/kube-proxy-config.yml
hostnameOverride: k8s-master2

5. 启动设置开机启动

systemctl daemon-reload
systemctl start kube-apiserver
systemctl start kube-controller-manager
systemctl start kube-scheduler
systemctl start kubelet
systemctl start kube-proxy
systemctl enable kube-apiserver
systemctl enable kube-controller-manager
systemctl enable kube-scheduler
systemctl enable kubelet
systemctl enable kube-proxy

6. 查看集群状态

kubectl get cs
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd- Healthy {"health":"true"}
etcd- Healthy {"health":"true"}
etcd- Healthy {"health":"true"}

7. 批准kubelet证书申请

kubectl get csr
NAME AGE SIGNERNAME REQUESTOR CONDITION
node-csr-JYNknakEa_YpHz797oKaN-ZTk43nD51Zc9CJkBLcASU 85m kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Pending kubectl certificate approve node-csr-JYNknakEa_YpHz797oKaN-ZTk43nD51Zc9CJkBLcASU kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master Ready <none> 34h v1.18.3
k8s-master2 Ready <none> 83m v1.18.3
k8s-node1 Ready <none> 33h v1.18.3
k8s-node2 Ready <none> 33h v1.18.3

如果你在学习中遇到问题或者文档有误可联系阿良~ 微信: init1024

7.3 部署Nginx负载均衡器

kube-apiserver高可用架构图:

  • Nginx是一个主流Web服务和反向代理服务器,这里用四层实现对apiserver实现负载均衡。
  • Keepalived是一个主流高可用软件,基于VIP绑定实现服务器双机热备,在上述拓扑中,Keepalived主要根据Nginx运行状态判断是否需要故障转移(偏移VIP),例如当Nginx主节点挂掉,VIP会自动绑定在Nginx备节点,从而保证VIP一直可用,实现Nginx高可用。

1. 安装软件包(主/备)

yum install epel-release -y
yum install nginx keepalived -y

2. Nginx配置文件(主/备一样)

cat > /etc/nginx/nginx.conf << "EOF"
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid; include /usr/share/nginx/modules/*.conf; events {
worker_connections 1024;
} # 四层负载均衡,为两台Master apiserver组件提供负载均衡
stream { log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent'; access_log /var/log/nginx/k8s-access.log main; upstream k8s-apiserver {
server 192.168.31.71:6443; # Master1 APISERVER IP:PORT
server 192.168.31.74:6443; # Master2 APISERVER IP:PORT
} server {
listen 6443;
proxy_pass k8s-apiserver;
}
} http {
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"'; access_log /var/log/nginx/access.log main; sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048; include /etc/nginx/mime.types;
default_type application/octet-stream; server {
listen 80 default_server;
server_name _; location / {
}
}
}
EOF

3. keepalived配置文件(Nginx Master)

cat > /etc/keepalived/keepalived.conf << EOF
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout
router_id NGINX_MASTER
} vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh"
} vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id # VRRP 路由 ID实例,每个实例是唯一的
priority # 优先级,备服务器设置
advert_int # 指定VRRP 心跳包通告间隔时间,默认1秒
authentication {
auth_type PASS
auth_pass
}
# 虚拟IP
virtual_ipaddress {
192.168.31.88/
}
track_script {
check_nginx
}
}
EOF
  • vrrp_script:指定检查nginx工作状态脚本(根据nginx状态判断是否故障转移)

  • virtual_ipaddress:虚拟IP(VIP)

检查nginx状态脚本:

cat > /etc/keepalived/check_nginx.sh  << "EOF"
#!/bin/bash
count=$(ps -ef |grep nginx |egrep -cv "grep|$$") if [ "$count" -eq ];then
exit
else
exit
fi
EOF
chmod +x /etc/keepalived/check_nginx.sh

4. keepalived配置文件(Nginx Backup)

cat > /etc/keepalived/keepalived.conf << EOF
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout
router_id NGINX_BACKUP
} vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh"
} vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id # VRRP 路由 ID实例,每个实例是唯一的
priority
advert_int
authentication {
auth_type PASS
auth_pass
}
virtual_ipaddress {
192.168.31.88/
}
track_script {
check_nginx
}
}
EOF

上述配置文件中检查nginx运行状态脚本:

cat > /etc/keepalived/check_nginx.sh  << "EOF"
#!/bin/bash
count=$(ps -ef |grep nginx |egrep -cv "grep|$$") if [ "$count" -eq ];then
exit
else
exit
fi
EOF
chmod +x /etc/keepalived/check_nginx.sh

注:keepalived根据脚本返回状态码(0为工作正常,非0不正常)判断是否故障转移。

5. 启动并设置开机启动

systemctl daemon-reload
systemctl start nginx
systemctl start keepalived
systemctl enable nginx
systemctl enable keepalived

6. 查看keepalived工作状态

ip a
: lo: <LOOPBACK,UP,LOWER_UP> mtu qdisc noqueue state UNKNOWN group default qlen
link/loopback ::::: brd :::::
inet 127.0.0.1/ scope host lo
valid_lft forever preferred_lft forever
inet6 ::/ scope host
valid_lft forever preferred_lft forever
: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu qdisc pfifo_fast state UP group default qlen
link/ether :0c:::f7:2c brd ff:ff:ff:ff:ff:ff
inet 192.168.31.80/ brd 192.168.31.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 192.168.31.88/ scope global secondary ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe04:f72c/ scope link
valid_lft forever preferred_lft forever

可以看到,在ens33网卡绑定了192.168.31.88 虚拟IP,说明工作正常。

7. Nginx+Keepalived高可用测试

关闭主节点Nginx,测试VIP是否漂移到备节点服务器。

在Nginx Master执行 pkill nginx
在Nginx Backup,ip addr命令查看已成功绑定VIP。

8. 访问负载均衡器测试

找K8s集群中任意一个节点,使用curl查看K8s版本测试,使用VIP访问:

curl -k https://192.168.31.88:6443/version
{
"major": "",
"minor": "",
"gitVersion": "v1.18.3",
"gitCommit": "2e7996e3e2712684bc73f0dec0200d64eec7fe40",
"gitTreeState": "clean",
"buildDate": "2020-05-20T12:43:34Z",
"goVersion": "go1.13.9",
"compiler": "gc",
"platform": "linux/amd64"
}

可以正确获取到K8s版本信息,说明负载均衡器搭建正常。该请求数据流程:curl -> vip(nginx) -> apiserver

通过查看Nginx日志也可以看到转发apiserver IP:

tail /var/log/nginx/k8s-access.log -f
192.168.31.81 192.168.31.71: - [/May/::: +]
192.168.31.81 192.168.31.74: - [/May/::: +]

到此还没结束,还有下面最关键的一步。

7.4 修改所有Worker Node连接LB VIP

试想下,虽然我们增加了Master2和负载均衡器,但是我们是从单Master架构扩容的,也就是说目前所有的Node组件连接都还是Master1,如果不改为连接VIP走负载均衡器,那么Master还是单点故障。

因此接下来就是要改所有Node组件配置文件,由原来192.168.31.71修改为192.168.31.88(VIP):

角色 IP
k8s-master1 192.168.31.71
k8s-master2 192.168.31.74
k8s-node1 192.168.31.72
k8s-node2 192.168.31.73

也就是通过kubectl get node命令查看到的节点。

在上述所有Worker Node执行:

sed -i 's#192.168.31.71:6443#192.168.31.88:6443#' /opt/kubernetes/cfg/*
systemctl restart kubelet
systemctl restart kube-proxy

检查节点状态:

kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master Ready <none> 34h v1.18.3
k8s-master2 Ready <none> 101m v1.18.3
k8s-node1 Ready <none> 33h v1.18.3
k8s-node2 Ready <none> 33h v1.18.3

至此,一套完整的 Kubernetes 高可用集群就部署完成了!

PS:如果你是在公有云上,一般都不支持keepalived,那么你可以直接用它们的负载均衡器产品(内网就行,还免费~),架构与上面一样,直接负载均衡多台Master kube-apiserver即可!

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