Shell脚本实现----Kubernetes单集群二进制部署

 Shell脚本实现----Kubernetes单集群二进制部署

 

搭建Kubernetes集群环境有以下三种方式：

1. Minikube安装方式
Minikube是一个工具，可以在本地快速运行一个单点的Kubernetes，尝试Kubernetes或日常开发的用户使用。但是这种方式仅可用于学习和测试部署，不能用于生产环境。

2. Kubeadm安装方式
kubeadm是一个kubernetes官方提供的快速安装和初始化拥有最佳实践（best practice）的kubernetes集群的工具，提供kubeadm init和kubeadm join，用于快速部署Kubernetes集群。目前kubeadm还处于beta 和alpha状态，可以通过学习这种部署方法来体会一些官方推荐的kubernetes最佳实践的设计和思想，目前大的生产环境中比较少用。

3. 二进制包安装方式（生产部署的推荐方式）
从官方下载发行版的二进制包，手动部署每个组件，组成Kubernetes集群，这种方式符合企业生产环境标准的Kubernetes集群环境的安装，可用于生产方式部署。

# wget https://dl.k8s.io/v1.16.1/kubernetes-server-linux-amd64.tar.gz
# wget https://github.com/etcd-io/etcd/releases/download/v3.3.13/etcd-v3.3.13-linux-amd64.tar.gz
# 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
# wget https://github.com/coreos/flannel/releases/download/v0.11.0/flannel-v0.11.0-linux-amd64.tar.gz

 

软件环境

 

系统: CentOS7.8

Docker: docker-ce.18.06

Kubernetes: v1.16.1

Etcd Version: 3.3.13

Flanneld: v0.11.0

 

服务器规划

 

IP	主机名	角色	安装组件
192.168.10.10	k8s-master	master	kube- apiserver  kube- controller-manager  kube- scheduler  etcd  kubectl
192.168.10.11	k8s-node1	node1	kubelet  kube-proxy docker  flannel  etcd
192.168.10.12	k8s-node2	node2	kubelet  kube-proxy docker  flannel  etcd

 

 

1. 环境准备(所有机器)

1.1 关闭防火墙, selinux (略)

1.2 互相解析 (略)，master节点上传公钥到node节点

1.3 配置好集群时间同步 (略)

1.4 更新内核(7.6以上的系统不需要这步)

# yum update

1.5 关闭 swap

# swapoff -a

# sed -i.bak 's/^.*swap/#&/' /etc/fstab

1.6 配置内核参数

# vim /etc/sysctl.d/kubernetes.conf

net.bridge.bridge-nf-call-ip6tables = 1

net.bridge.bridge-nf-call-iptables = 1

net.ipv4.ip_forward = 1

# sysctl -p

1.7 重启(升级内核则需要做此步)

# shutdown -r now

1.8 验证

# uname -r

3.10.0-1062.4.1.el7.x86_64

# free -m

total used free shared buff/cache available

Mem: 1980 120 1371 9 488 1704

Swap: 0 0 0

 

2. 编写脚本及上传二进制包

在/root/目录下

 

主脚本

vim main.sh

#/bin/bash
#auther:sunli
#mail:<1916989848@qq.com>
k8s_master=192.168.10.10
k8s_node1=192.168.10.11
k8s_node2=192.168.10.12
sh ansible_docker.sh $k8s_node1 $k8s_node2 || (echo "docker install error" && exit)
sh etcd_install.sh $k8s_master $k8s_node1 $k8s_node2 || (echo "etcd install error" && exit)
sh flannel_install.sh $k8s_master $k8s_node1 $k8s_node2 || (echo "flannel install error" && exit)
sh master.sh $k8s_master || (echo "master install error" && exit)
sh node.sh $k8s_master $k8s_node1 $k8s_node2 || (echo "node install error" && exit)

 

 

docker安装脚本

vim docker_install.sh

#!bin/bash
[ ! -x /usr/bin/ansible ] && yum -y install ansible
cat >> /etc/ansible/hosts << EOF
[docker]
$1
$2
EOF
ansible docker -m script -a 'creates=/root/docker_install.sh /root/docker_install.sh'

vim ansible_docker.sh

#!bin/bash
[ ! -x /usr/bin/ansible ] && yum -y install ansible
cat >> /etc/ansible/hosts << EOF
[docker]
$1
$2
EOF
ansible docker -m script -a 'creates=/root/docker_install.sh /root/docker_install.sh'

 

CA签证脚本

vim CA.sh

#/bin/bash
#auther:sunli
#mail:<1916989848@qq.com>
#description：利用cfssljson格式，自建CA中心，生成ca-key.pem（私钥）和ca.pem（证书），还会生成ca.csr（证书签名请求）

CFSSL() {
#将下载好的三个cfssl文件赋予可执行权限,并设置为系统命令
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
mv cfssl* /usr/local/bin/
chmod +x /usr/local/bin/cfssl*
}

#判断cfssl命令是否存在
which cfssljson_linux-amd64
[ `echo $?` -ne 0 ] && CFSSL

#确定service
service=$1
[ ! -d /etc/$service/ssl ] && mkdir -p /etc/$service/ssl
CA_DIR=/etc/$service/ssl

#CA中心配置文件
CA_CONFIG() {
cat >> $CA_DIR/ca-config.json <<- EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "$service": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF
}

#CA证书签名请求
CA_CSR() {
cat >> $CA_DIR/ca-csr.json <<- EOF
{
    "CN": "$service",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "GuangDong",
            "ST": "GuangZhou",
            "O": "$service",
            "OU": "System"
        }
    ]
}
EOF
}

#服务器请求CA中心颁发证书签名请求
SERVER_CSR() {
host1=192.168.10.10
host2=192.168.10.11
host3=192.168.10.12
host4=192.168.10.13
host5=192.168.10.14
host6=192.168.10.15
cat >> $CA_DIR/server-csr.json <<- EOF
{
    "CN": "$service",
    "hosts": [
    "127.0.0.1",
    "$host1",
    "$host2",
    "$host3",
    "$host4",
    "$host5"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "GuangDong",
            "ST": "GuangZhou",
            "O": "$service",
            "OU": "System"
        }
    ]
}
EOF
}

SERVER_CSR1() {
host1=192.168.10.10
host2=192.168.10.20
host3=192.168.10.30
host4=192.168.10.40
cat >> $CA_DIR/server-csr.json <<- EOF
{
    "CN": "$service",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "$host1",
      "$host2",
      "$host3",
      "$host4",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "GuangDong",
            "ST": "GuangZhou",
            "O": "$service",
            "OU": "System"
        }
    ]
}
EOF
}

CA_CONFIG && CA_CSR
[ "$service" == "kubernetes" ] && SERVER_CSR1 || SERVER_CSR

#生成CA所必需的文件ca-key.pem（私钥）和ca.pem（证书），还会生成ca.csr（证书签名请求），用于交叉签名或重新签名
cd $CA_DIR/
cfssl_linux-amd64 gencert -initca ca-csr.json | cfssljson_linux-amd64 -bare ca

#生成证书
cfssl_linux-amd64 gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=$service server-csr.json | cfssljson_linux-amd64 -bare server

 

 

 

安装etcd

vim etcd_install.sh

#/bin/bash
#解压etcd二进制包,将二进制命令设置为系统命令
etcd_01=$1
etcd_02=$2
etcd_03=$3

sh CA.sh etcd || (echo "etcd CA not build" && exit)
#将二进制包提前拷贝至当前路径
dir=./
pkgname=etcd-v3.3.13-linux-amd64
[ ! -e $dir/$pkgname.tar.gz ] && echo "no package" && exit
tar xf $dir/$pkgname.tar.gz
cp -p $dir/$pkgname/etc* /usr/local/bin/

#创建etcd配置文件
ETCD_CONFIG() {
cat >> /etc/etcd/etcd.conf <<- EOF
#[Member]
ETCD_NAME="etcd-01"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://$etcd_01:2380"
ETCD_LISTEN_CLIENT_URLS="https://$etcd_01:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://$etcd_01:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://$etcd_01:2379"
ETCD_INITIAL_CLUSTER="etcd-01=https://$etcd_01:2380,etcd-02=https://$etcd_02:2380,etcd-03=https://$etcd_03:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
}

#创建etcd的system启动文件
ETCD_SERVICE() {
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=/etc/etcd/etcd.conf
ExecStart=/usr/local/bin/etcd \
--name=\${ETCD_NAME} \
--data-dir=\${ETCD_DATA_DIR} \
--listen-peer-urls=\${ETCD_LISTEN_PEER_URLS} \
--listen-client-urls=\${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \
--advertise-client-urls=\${ETCD_ADVERTISE_CLIENT_URLS} \
--initial-advertise-peer-urls=\${ETCD_INITIAL_ADVERTISE_PEER_URLS} \
--initial-cluster=\${ETCD_INITIAL_CLUSTER} \
--initial-cluster-token=\${ETCD_INITIAL_CLUSTER_TOKEN} \
--initial-cluster-state=new \
--cert-file=/etc/etcd/ssl/server.pem \
--key-file=/etc/etcd/ssl/server-key.pem \
--peer-cert-file=/etc/etcd/ssl/server.pem \
--peer-key-file=/etc/etcd/ssl/server-key.pem \
--trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF
}

ETCD_CONFIG && ETCD_SERVICE

#将master节点的配置信息拷贝到node节点,前提已做ssh授信和域名解析
scp /usr/local/bin/etcd* $etcd_02:/usr/local/bin/
scp -r /etc/etcd/ $etcd_02:/etc/
scp /usr/lib/systemd/system/etcd.service $etcd_02:/usr/lib/systemd/system/

scp /usr/local/bin/etcd* $etcd_03:/usr/local/bin/
scp -r /etc/etcd/ $etcd_03:/etc/
scp /usr/lib/systemd/system/etcd.service $etcd_03:/usr/lib/systemd/system/

#安装ansible，并将node_ip写入host
[ ! -x /usr/bin/ansible ] && yum -y install ansible
echo "[etcd]" >>  /etc/ansible/hosts
echo "$etcd_02" >>  /etc/ansible/hosts
echo "$etcd_03" >>  /etc/ansible/hosts

#修改etcd-02的etcd.conf
cat >> /tmp/etcd-02.sh <<- EOF
#/bin/bash
sed -i "s#\"etcd-01\"#\"etcd-02\"#g" /etc/etcd/etcd.conf
sed -i "s#\"https://$etcd_01#\"https://$etcd_02#g" /etc/etcd/etcd.conf
EOF
ansible $etcd_02 -m script -a 'creates=/tmp/etcd-02.sh /tmp/etcd-02.sh'

#修改etcd-03的etcd.conf
#ansible $etcd_03 -m lineinfile -a "dest=/etc/etcd/etcd.conf regexp='ETCD_NAME=\"etcd-01\"' line='ETCD_NAME=\"etcd-03\"' backrefs=yes"
cat >> /tmp/etcd-03.sh <<- EOF
#/bin/bash
sed -i "s#\"etcd-01\"#\"etcd-03\"#g" /etc/etcd/etcd.conf
sed -i "s#\"https://$etcd_01#\"https://$etcd_03#g" /etc/etcd/etcd.conf
EOF
ansible $etcd_03 -m script -a 'creates=/tmp/etcd-03.sh /tmp/etcd-03.sh'

#启动etcd-02、etcd-03
ansible etcd -m service -a "name=etcd state=started enabled=yes" && continue

#启动etcd_01
systemctl enable etcd
systemctl start etcd

#别名简化
cat >>  /etc/profile.d/alias_etcd.sh <<- EOF
alias etcdctld='etcdctl --cert-file=/etc/etcd/ssl/server.pem \
--key-file=/etc/etcd/ssl/server-key.pem \
--ca-file=/etc/etcd/ssl/ca.pem \
--endpoint=https://$etcd_01:2379,https://$etcd_02:2379,https://$etcd_03:2379'
EOF
source /etc/profile.d/alias_etcd.sh

#将简化的命令拷贝node
scp /etc/profile.d/alias_etcd.sh $etcd_02:/etc/profile.d/
scp /etc/profile.d/alias_etcd.sh $etcd_03:/etc/profile.d/
ansible etcd -m shell -a "source /etc/profile.d/alias_etcd.sh"

#输出etcd集群健康,注意重开终端生效
etcdctld cluster-health

 

 

安装flannel

vim flannel_install.sh

#/bin/bash
flannel_01=192.168.10.10
flannel_02=192.168.10.11
flannel_03=192.168.10.12

#将二进制包提前拷贝至当前路径
dir=./
pkgname=flannel-v0.11.0-linux-amd64
[ ! -e $dir/$pkgname.tar.gz ] && echo "error:no package" && exit
tar xf $dir/$pkgname.tar.gz
mv $dir/{flanneld,mk-docker-opts.sh} /usr/local/bin/

#向 etcd 写入集群 Pod 网段信息(在任意一个etcd节点执行)
cd /etc/etcd/ssl/
etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \
--endpoint=https://$flannel_01:2379,https://$flannel_02:2379,https://$flannel_03:2379 \
set /coreos.com/network/config '{ "Network": "10.244.0.0/16", "Backend": {"Type": "vxlan"}}'

#创建flannel.conf
FLANNEL_CONFIG() {
cat >> /etc/flannel.conf <<- EOF
FLANNEL_OPTIONS="--etcd-endpoints=https://$flannel_01:2379,https://$flannel_02:2379,https://$flannel_03:2379 -etcd-cafile=/etc/etcd/ssl/ca.pem -etcd-certfile=/etc/etcd/ssl/server.pem -etcd-keyfile=/etc/etcd/ssl/server-key.pem"
EOF
}

#创建flannel.service
FLANNEL_SERVICE() {
cat >> /usr/lib/systemd/system/flanneld.service <<- EOF
[Unit]
Description=Flanneld overlay address etcd agent
After=network-online.target network.target
Before=docker.service

[Service]
Type=notify
EnvironmentFile=/etc/flannel.conf
ExecStart=/usr/local/bin/flanneld --ip-masq \$FLANNEL_OPTIONS
ExecStartPost=/usr/local/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF
}

#重建docker.service
DOCKER_SERVICE() {
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
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd \$DOCKER_NETWORK_OPTIONS
ExecReload=/bin/kill -s HUP \$MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target
EOF
}

FLANNEL_CONFIG && FLANNEL_SERVICE && DOCKER_SERVICE

scp /usr/local/bin/{flanneld,mk-docker-opts.sh} $flannel_02:/usr/local/bin/
scp /usr/local/bin/{flanneld,mk-docker-opts.sh} $flannel_03:/usr/local/bin/

scp /etc/flannel.conf $flannel_02:/etc/
scp /etc/flannel.conf $flannel_03:/etc/

scp /usr/lib/systemd/system/flanneld.service $flannel_02:/usr/lib/systemd/system/
scp /usr/lib/systemd/system/flanneld.service $flannel_03:/usr/lib/systemd/system/

scp /usr/lib/systemd/system/docker.service $flannel_02:/usr/lib/systemd/system/
scp /usr/lib/systemd/system/docker.service $flannel_03:/usr/lib/systemd/system/

#安装ansible，并将node_ip写入host
[ ! -x /usr/bin/ansible ] && yum -y install ansible
echo "[flannel]" >>  /etc/ansible/hosts
echo "$flannel_02" >>  /etc/ansible/hosts
echo "$flannel_03" >>  /etc/ansible/hosts
ansible flannel -m service -a "name=flanneld state=started daemon_reload=yes enabled=yes" && continue
ansible flannel -m service -a "name=docker state=restarted enabled=yes" && continue

#别名简化
cat >>  /etc/profile.d/alias_etcdf.sh <<- EOF
alias etcdctlf='cd /etc/etcd/ssl/;etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem  --endpoint=https://$flannel_01:2379,https://$flannel_02:2379,https://$flannel_03:2379 ls /coreos.com/network/subnets'
EOF
source /etc/profile.d/alias_etcdf.sh

scp /etc/profile.d/alias_etcdf.sh $flannel_02:/etc/profile.d/
scp /etc/profile.d/alias_etcdf.sh $flannel_03:/etc/profile.d/
ansible flannel -m shell -a "source /etc/profile.d/alias_etcdf.sh"

 

 

master节点

vim master.sh

#/bin/bash

master=$!
#创建kubernetes的CA证书
sh CA.sh kubernetes

#配置kube-apiserver
#将kubernetes二进制包提前拷贝至当前路径
dir=./
pkgname=kubernetes-server-linux-amd64
[ ! -e $dir/$pkgname.tar.gz ] && echo "no package" && exit
tar xf $dir/$pkgname.tar.gz
cp -p $dir/kubernetes/server/bin/{kube-apiserver,kube-controller-manager,kube-scheduler,kubectl} /usr/local/bin/

#创建Bootstrapping Token 文件
TLS=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')
cat >> /etc/kubernetes/token.csv <<- EOF
$TLS,,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF

#创建 kube-apiserver 配置文件
KUBE_API_CONF() {
cat >> /etc/kubernetes/apiserver <<- EOF
KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://192.168.10.10:2379,https://192.168.10.11:2379,https://192.168.10.12:2379 \
--bind-address=$master \
--secure-port=6443 \
--advertise-address=$master \
--allow-privileged=true \
--service-cluster-ip-range=10.0.0.0/24 \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,NodeRestriction \
--authorization-mode=RBAC,Node \
--enable-bootstrap-token-auth \
--token-auth-file=/etc/kubernetes/token.csv \
--service-node-port-range=30000-50000 \
--tls-cert-file=/etc/kubernetes/ssl/server.pem \
--tls-private-key-file=/etc/kubernetes/ssl/server-key.pem \
--client-ca-file=/etc/kubernetes/ssl/ca.pem \
--service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \
--etcd-cafile=/etc/etcd/ssl/ca.pem \
--etcd-certfile=/etc/etcd/ssl/server.pem \
--etcd-keyfile=/etc/etcd/ssl/server-key.pem"
EOF
}

#创建kube-apiserver.service的systemd 启动文件
KUBE_API_SERVICE() {
cat >> /usr/lib/systemd/system/kube-apiserver.service <<- EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=etcd.service
Wants=etcd.service

[Service]
EnvironmentFile=-/etc/kubernetes/apiserver
ExecStart=/usr/local/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF
}

KUBE_API_CONF && KUBE_API_SERVICE
#启动服务
systemctl daemon-reload
systemctl start kube-apiserver
systemctl enable kube-apiserver

#部署kube-scheduler
#创建kube-scheduler.conf配置文件
KUBE_SCH_CONF() {
cat >> /etc/kubernetes/kube-scheduler.conf <<- EOF
KUBE_SCHEDULER_OPTS="--logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect"
EOF
}

#创建kube-scheduler的systemd启动文件
KUBE_SCH_SERVICE() {
cat >> /usr/lib/systemd/system/kube-scheduler.service <<- EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/etc/kubernetes/kube-scheduler.conf
ExecStart=/usr/local/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF
}

KUBE_SCH_CONF && KUBE_SCH_SERVICE
#启动服务
systemctl daemon-reload
systemctl start kube-scheduler
systemctl enable kube-scheduler

#部署kube-controller-manager
#创建kube-controller-manager.conf配置文件
KUBE_CM_CONF() {
cat >> /etc/kubernetes/kube-controller-manager.conf <<- EOF
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \
--v=4 \
--master=127.0.0.1:8080 \
--leader-elect=true \
--address=127.0.0.1 \
--service-cluster-ip-range=10.0.0.0/24 \
--cluster-name=kubernetes \
--cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem \
--cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--root-ca-file=/etc/kubernetes/ssl/ca.pem \
--service-account-private-key-file=/etc/kubernetes/ssl/ca-key.pem"
EOF
}

#创建kube-controller-manager的systemd 启动文件
KUBE_CM_SERVICE() {
cat >> /usr/lib/systemd/system/kube-controller-manager.service <<- EOF
[unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/etc/kubernetes/kube-controller-manager.conf
ExecStart=/usr/local/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF
}

KUBE_CM_CONF && KUBE_CM_SERVICE
#启动服务
systemctl daemon-reload
systemctl start kube-controller-manager
systemctl enable kube-controller-manager

#检查各服务状态及 Master 集群状态
kubectl get cs

 

 

 

 

部署node节点

vim node.sh

#/bin/bash
master=$1
node1=$2
node2=$3
ssh $node1 "mkdir -p /etc/kubernetes/ssl"
ssh $node2 "mkdir -p /etc/kubernetes/ssl"
dir=./
[ ! -d kubernetes ] && echo "error:no kubernetes dir" && exit
#部署kubelet
#在master节点创建 kube-proxy 证书
kube_proxy_csr() {
cd /etc/kubernetes/ssl/
cat >> /etc/kubernetes/ssl/kube-proxy-csr.json <<- EOF
{
    "CN": "system:kube-proxy",
    "hosts": [],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
    {
        "C": "CN",
        "L": "GuangDong",
        "ST": "GuangZhou",
        "O": "kubernetes",
        "OU": "System"
    }
    ]
}
EOF
cfssl_linux-amd64 gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json --profile=kubernetes kube-proxy-csr.json | cfssljson_linux-amd64 -bare kube-proxy
}
kube_proxy_csr || exit

#创建 kubelet bootstrap kubeconfig 文件
#写一个脚本bs_kubeconfig.sh
cat >> /tmp/bs_kubeconfig.sh <<- EOF
#!/bin/bash
BOOTSTRAP_TOKEN=$(awk -F "," '{print $1}' /etc/kubernetes/token.csv)
KUBE_SSL=/etc/kubernetes/ssl
KUBE_APISERVER="https://$master:6443"
cd \$KUBE_SSL/
# 设置集群参数
kubectl config set-cluster kubernetes \
--certificate-authority=./ca.pem \
--embed-certs=true \
--server=\${KUBE_APISERVER} \
--kubeconfig=bootstrap.kubeconfig
# 设置客户端认证参数
kubectl config set-credentials kubelet-bootstrap \
--token=\${BOOTSTRAP_TOKEN} \
--kubeconfig=bootstrap.kubeconfig
# 设置上下文参数
kubectl config set-context default \
--cluster=kubernetes \
--user=kubelet-bootstrap \
--kubeconfig=bootstrap.kubeconfig
# 设置上下文
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
# 创建 kube-proxy kubeconfig 文件
kubectl config set-cluster kubernetes \
--certificate-authority=./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
# 将 kubelet-bootstrap 用户绑定到系统集群角色
kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap
EOF
#执行脚本
sh /tmp/bs_kubeconfig.sh
#查看ls /etc/kubernetes/ssl/*.kubeconfig
#会有/etc/kubernetes/ssl/bootstrap.kubeconfig /etc/kubernetes/ssl/kube-proxy.kubeconfig这两个文件

#将二进制文件, 刚生成的两个 .kubeconfig 文件拷贝到所有的 node 节点
#SHELL_FOLDER=$(cd "$(dirname "$0")";pwd)
scp /root/kubernetes/server/bin/{kubelet,kube-proxy} $node1:/usr/local/bin/
scp /root/kubernetes/server/bin/{kubelet,kube-proxy} $node2:/usr/local/bin/
scp /etc/kubernetes/ssl/*.kubeconfig $node1:/etc/kubernetes/
scp /etc/kubernetes/ssl/*.kubeconfig $node2:/etc/kubernetes/

#node:创建 kubelet 配置文件
KUBELET_CONF() {
cat >> /etc/kubernetes/kubelet.conf <<- EOF
KUBELET_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=$master \
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
--bootstrap-kubeconfig=/etc/kubernetes/bootstrap.kubeconfig \
--config=/etc/kubernetes/kubelet.yaml \
--cert-dir=/etc/kubernetes/ssl \
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"
EOF
}

#创建kube-proxy.conf配置文件
KUBE_PROXY_CONF() {
cat >> /etc/kubernetes/kube-proxy.conf <<- EOF
KUBE_PROXY_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=$master \
--cluster-cidr=10.0.0.0/24 \
--kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig"
EOF
}

#创建 kubelet 参数配置模板文件
KUBELET_YAML() {
cat >> /etc/kubernetes/kubelet.yaml <<- EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: $master
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS: ["10.0.0.2"]
clusterDomain: cluster.local.
failSwapOn: false
authentication:
    anonymous:
        enabled: true
EOF
}

#创建 kubelet的systemd 启动文件
KUBELET_SERVICE() {
cat >> /usr/lib/systemd/system/kubelet.service <<- EOF
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Requires=docker.service

[Service]
EnvironmentFile=/etc/kubernetes/kubelet.conf
ExecStart=/usr/local/bin/kubelet \$KUBELET_OPTS
Restart=on-failure
KillMode=process

[Install]
WantedBy=multi-user.target
EOF
}

#创建 kube-proxy的systemd 启动文件
KUBE_PROXY_SERVICE() {
cat >> /usr/lib/systemd/system/kube-proxy.service <<- EOF
[Unit]
Description=Kubernetes Proxy
After=network.target

[Service]
EnvironmentFile=-/etc/kubernetes/kube-proxy.conf
ExecStart=/usr/local/bin/kube-proxy \$KUBE_PROXY_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF
}

KUBELET_CONF && KUBELET_YAML && KUBELET_SERVICE && KUBE_PROXY_CONF && KUBE_PROXY_SERVICE

scp /etc/kubernetes/{kubelet.conf,kubelet.yaml,kube-proxy.conf} $node1:/etc/kubernetes/
scp /etc/kubernetes/{kubelet.conf,kubelet.yaml,kube-proxy.conf} $node2:/etc/kubernetes/

scp /usr/lib/systemd/system/{kubelet.service,kube-proxy.service} $node1:/usr/lib/systemd/system/
scp /usr/lib/systemd/system/{kubelet.service,kube-proxy.service} $node2:/usr/lib/systemd/system/

#修改node1的kubelet.conf、kubelet.yaml、kube-proxy.conf
cat >> /tmp/kubelet_conf1.sh <<- EOF
#/bin/bash
sed -i "s#$master#$node1#g" /etc/kubernetes/{kubelet.conf,kubelet.yaml,kube-proxy.conf}
EOF
ansible $node1 -m script -a 'creates=/tmp/kubelet_conf1.sh /tmp/kubelet_conf1.sh'

#修改node2的kubelet.conf、kubelet.yaml、kube-proxy.conf
cat >> /tmp/kubelet_conf2.sh <<- EOF
#/bin/bash
sed -i "s#$master#$node2#g" /etc/kubernetes/{kubelet.conf,kubelet.yaml,kube-proxy.conf}
EOF
ansible $node2 -m script -a 'creates=/tmp/kubelet_conf2.sh /tmp/kubelet_conf2.sh'

#安装ansible，并将node_ip写入host
[ ! -x /usr/bin/ansible ] && yum -y install ansible
echo "[node]" >>  /etc/ansible/hosts
echo "$node1" >>  /etc/ansible/hosts
echo "$node2" >>  /etc/ansible/hosts
ansible node -m service -a "name=kubelet state=started daemon_reload=yes enabled=yes" && continue
ansible node -m service -a "name=kube-proxy state=started daemon_reload=yes enabled=yes" && continue

#Approve kubelet CSR请求
kubectl certificate approve `kubectl get csr|awk 'NR>1{print $1}'`