概述
k8s单master节点的部署（实验）
文章目录
- k8s单master节点的部署（实验）
- 1.单master集群部署的环境
- 2.ETCD集群的部署
- 2.1 安装制作证书的工具cfssl
- 2.2 制作CA证书
- 2.3 使用证书、etcd脚本搭建ETCD集群
- 2.4node节点加入ETCD集群
- 3.docker的部署
- 4.flannel网络组件的部署
- 5.部署master组件
- 6.总结
1.单master集群部署的环境
- 搭建k8s集群部署所需要的服务器（三个节点）：
| 服务器 | 需要安装的软件 |
|---|---|
| master（192.168.73.11） | kube-apiserver、kube-controller-manager、kube-scheduler、etcd |
| node01(192.168.73.12) | kubelet、kube-proxy、docker、flannel、etcd |
| node02(192.168.73.13) | kubelet、kube-proxy、docker、flannel、etcd |
- 将网卡配置成静态网卡
vim /etc/sysconfig/network-scripts/ifcfg-ens33
#将网卡设置为静态的网卡
BOOTPROTO=static
#开启开机自启网卡
ONBOOT=yes
#配置IP地址、子网掩码、网关、上网的dns
IPADDR=192.168.73.11
#另外的两个IP地址为：192.168.73.12、192.168.73.13
NETMASK=255.255.255.0
GATEWAY=192.168.73.2
DNS1=8.8.8.8
DNS2=114.114.114.114
- 防止重启虚拟机IP的地址变化
systemctl stop NetworkManager
#关闭网络管理
systemctl disable NetworkManager
#关闭网络管理的开机自启动
systemctl restart network
#重启网卡
ping www.baidu.com
#对百度的ping测试，确保能够上网
- 防火墙不要关闭
systemctl start firewalld
#开启防火墙
iptables -F
#清空防火墙的规则链
setenforce 0
#关闭防火墙的核心防护
2.ETCD集群的部署
- ETCD之间通信都是经过加密，所以要创建CA证书所使用TLS加密通讯
2.1 安装制作证书的工具cfssl
- master节点：
[root@localhost ~]# mkdir k8s
[root@localhost ~]# cd k8s/
//编写cfssl.sh脚本，从官网下载制作证书的工具cfssl，直接放在/usr/local/bin目录下，方便系统识别，最后给工具加执行权限
[root@localhost k8s]# vi cfssl.sh
curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo
[root@localhost k8s]# bash cfssl.sh #执行脚本等待安装下载软件
[root@localhost k8s]# ls /usr/local/bin/ #可以看到三个制作证书的工具
cfssl cfssl-certinfo cfssljson
#cfssl：生成证书工具
#cfssl-certinfo：查看证书信息
#cfssljson：通过传入json文件生成证书
2.2 制作CA证书
[root@localhost k8s]# mkdir etcd-cert
[root@localhost k8s]# cd etcd-cert/
- 创建生成ca证书的配置文件
[root@localhost etcd-cert]# cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"www": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
- 创建ca证书的签名证书
[root@localhost etcd-cert]# cat > ca-csr.json <<EOF
{
"CN": "etcd CA",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing"
}
]
}
EOF
- 用ca签名证书生成ca证书，得到ca-key.pem ca.pem
[root@localhost etcd-cert]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
- 指定etcd三个节点之间的通信验证需要服务器签名证书server-csr.json
[root@localhost etcd-cert]# cat > server-csr.json <<EOF
{
"CN": "etcd",
"hosts": [
"192.168.73.11", #修改成自己的节点IP地址
"192.168.73.12",
"192.168.73.13"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing"
}
]
}
EOF
- 使用ca-key.pem、ca.pem、服务器签名证书 生成ETCD证书 server-key.pem server.pem
[root@localhost etcd-cert]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
2.3 使用证书、etcd脚本搭建ETCD集群
- 上传一个生成etcd配置文件的脚本etcd.sh到/root/k8s目录下面，脚本内容如下：
[root@localhost k8s]# vi /root/k8s/etcd.sh
#!/bin/bash
# example: ./etcd.sh etcd01 192.168.73.11 etcd02=https://192.168.73.12:2380,etcd03=https://192.168.73,13:2380
ETCD_NAME=$1
ETCD_IP=$2
ETCD_CLUSTER=$3
WORK_DIR=/opt/etcd
#创建节点的配置文件模板
cat <<EOF >$WORK_DIR/cfg/etcd
#[Member]
ETCD_NAME="${ETCD_NAME}"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_LISTEN_CLIENT_URLS="https://${ETCD_IP}:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://${ETCD_IP}:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://${ETCD_IP}:2380,${ETCD_CLUSTER}"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
#创建节点的启动脚本模板
cat <<EOF >/usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=${WORK_DIR}/cfg/etcd
ExecStart=${WORK_DIR}/bin/etcd
--name=${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=${ETCD_INITIAL_CLUSTER_TOKEN}
--initial-cluster-state=new
--cert-file=${WORK_DIR}/ssl/server.pem
--key-file=${WORK_DIR}/ssl/server-key.pem
--peer-cert-file=${WORK_DIR}/ssl/server.pem
--peer-key-file=${WORK_DIR}/ssl/server-key.pem
--trusted-ca-file=${WORK_DIR}/ssl/ca.pem
--peer-trusted-ca-file=${WORK_DIR}/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
#重启服务，并设置开机自启
systemctl daemon-reload
systemctl enable etcd
systemctl restart etcd
- 把下载好的三个软件上传到k8s目录下
- 先解压etcd软件包到当前的目录下，再创建etcd集群的工作目录
[root@localhost k8s]# tar zxvf etcd-v3.3.10-linux-amd64.tar.gz
[root@localhost k8s]# ls etcd-v3.3.10-linux-amd64
Documentation etcd etcdctl README-etcdctl.md README.md READMEv2-etcdctl.md
#稍后使用源码包中的etcd、etcdctl 应用程序命令
[root@localhost k8s]# mkdir -p /opt/etcd/{cfg,bin,ssl}
[root@localhost k8s]# ls /opt/etcd/
bin cfg ssl
- 把etcd、etcdctl执行文件放在/opt/etcd/bin/
[root@localhost k8s]# mv etcd-v3.3.10-linux-amd64/etcd etcd-v3.3.10-linux-amd64/etcdctl /opt/etcd/bin/
- 拷贝证书到/opt/etcd/ssl/目录下
[root@localhost k8s]# cp etcd-cert/*.pem /opt/etcd/ssl/
[root@localhost k8s]# ls /opt/etcd/ssl/
ca-key.pem ca.pem server-key.pem server.pem
- 执行etcd.sh脚本产生etcd集群的配置脚本和服务启动脚本，进行卡住状态等待其他节点加入
#注意：修改成自己的ip地址
[root@localhost k8s]# bash etcd.sh etcd01 192.168.73.11 etcd02=https://192.168.73.12:2380,etcd03=https://192.168.73.13:2380
//使用另外一个会话窗口，会发现etcd进程己经开启
[root@localhost k8s]# ps -ef | grep etcd
2.4node节点加入ETCD集群
- 在master节点上拷贝证书到其他的node节点
[root@localhost k8s]# scp -r /opt/etcd/ root@192.168.73.12:/opt/
#将master上面的文件拷贝到node01节点上
[root@localhost k8s]# scp -r /opt/etcd/ root@192.168.73.13:/opt/
#将master上面的文件拷贝到node02节点上
- 将master服务的启动文件拷贝到其他的node节点上
[root@localhost k8s]# scp /usr/lib/systemd/system/etcd.service root@192.168.73.12:/usr/lib/systemd/system/
root@192.168.73.12's password:
etcd.service 100% 923 105.2KB/s 00:00
[root@localhost k8s]# scp /usr/lib/systemd/system/etcd.service root@192.168.73.13:/usr/lib/systemd/system/
root@192.168.73.13's password:
etcd.service 100% 923 830.1KB/s 00:00
[root@localhost k8s]#
- 修改拷贝到node01节点上面的etcd配置文件
vim /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd02" #ETCD集群的节点名称
#下面的地址都要指向自己的IP地址
ETCD_LISTEN_PEER_URLS="https://192.168.73.12:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.73.12:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.73.12:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.73.12:2379"
- 修改拷贝到node01节点上面的etcd配置文件
vim /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd03" #ETCD集群的节点名称
#下面的地址都要指向自己的IP地址
ETCD_LISTEN_PEER_URLS="https://192.168.73.13:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.73.13:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.73.13:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.713:2379"
- 在master节点输入bash等待node节点加入
[root@localhost k8s]# bash etcd.sh etcd01 192.168.73.11 etcd02=https://192.168.73.12:2380,etcd03=https://192.168.73.13:2380
- 快速的启动node01、node02节点
[root@localhost ~]# systemctl start etcd
[root@localhost ~]# systemctl status etcd
- 查看集群状态
#在master节点上面操作
[root@localhost k8s]# cd /opt/etcd/ssl/
[root@localhost ssl]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.73.11:2379,https://192.168.73.12:2379,https://192.168.73.13:2379" cluster-health
3.docker的部署
//node节点上面配置docker
[root@localhost ~]# yum -y install yum-utils device-mapper-persistent-data lvm2
[root@localhost ~]#yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
[root@localhost ~]# yum -y install docker-ce
#启动docker
[root@localhost ~]# systemctl restart docker
[root@localhost ~]# systemctl enable docker
#配置镜像加速
[root@localhost ~]# tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors":["https://v8z6yng7.mirror.aliyuncs.com"]
}
EOF
#重启docker
[root@localhost ~]# systemctl daemon-reload
[root@localhost ~]# systemctl restart docker
#网络优化
[root@localhost ~]# vim /etc/sysctl.conf
net.ipv4.ip_forward=1
[root@localhost ~]# sysctl -p
[root@localhost ~]# service network restart
[root@localhost ~]# systemctl restart docker
[root@localhost ~]# docker images
[root@localhost ~]# docker ps -a
4.flannel网络组件的部署
- 建立ETCD集群与外部通信
- 在master节点上，将分配的子网段写入到etcd中，以便于flannel使用
注意：必须在证书存放的路径/root/k8s/etcd-cert下执行此命令。
[root@localhost etcd-cert]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.73.11:2379,https://192.168.73.12:2379,https://192.168.73.13:2379" set /coreos.com/network/config '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'
- 查看写入信息
[root@localhost etcd-cert]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.73.11:2379,https://192.168.73.12:2379,https://192.168.73.13:2379" get /coreos.com/network/config
{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}
- 在两个node节点上创建k8s工作目录
[root@localhost ~]# mkdir -p /opt/kubernetes/{cfg,bin,ssl}
[root@localhost ~]# mv mk-docker-opts.sh flanneld /opt/kubernetes/bin/
[root@localhost ~]# ls /opt/kubernetes/bin/
- 上传可以生成配置文件和启动文件的脚本flannel.sh
//脚本内容：
[root@localhost ~]# vi flannel.sh
#!/bin/bash
ETCD_ENDPOINTS=${1:-"http://127.0.0.1:2379"}
cat <<EOF >/opt/kubernetes/cfg/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=${ETCD_ENDPOINTS}
-etcd-cafile=/opt/etcd/ssl/ca.pem
-etcd-certfile=/opt/etcd/ssl/server.pem
-etcd-keyfile=/opt/etcd/ssl/server-key.pem"
EOF
cat <<EOF >/usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network-online.target network.target
Before=docker.service
[Service]
Type=notify
EnvironmentFile=/opt/kubernetes/cfg/flanneld
ExecStart=/opt/kubernetes/bin/flanneld --ip-masq $FLANNEL_OPTIONS
ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable flanneld
systemctl restart flanneld
- 两个node节点开启flannel网络功能
[root@localhost ~]# bash flannel.sh https://192.168.73.11:2379,https://192.168.73.12:2379,https://192.168.73.13:2379
- 查看网络状态是否运行
[root@localhost ~]# systemctl status flanneld
- 创建docker连接flannel网络
- 两个node节点，修改docker的配置文件
[root@localhost ~]# vi /usr/lib/systemd/system/docker.service
//修改添加两处：
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS -H fd:// --containerd=/run/containerd/containerd.sock
- 查看flannel网络分配的子网段
[root@localhost ~]# cat /run/flannel/subnet.env
- 启动docker服务
[root@localhost ~]# systemctl daemon-reload
[root@localhost ~]# systemctl restart docker
- 两个node节点分别创建并自动进入centos:7容器
[root@localhost ~]# docker run -it centos:7 /bin/bash
Unable to find image 'centos:7' locally
7: Pulling from library/centos
ab5ef0e58194: Pull complete
Digest: sha256:4a701376d03f6b39b8c2a8f4a8e499441b0d567f9ab9d58e4991de4472fb813c
Status: Downloaded newer image for centos:7
[root@690ec8bdaa81 /]# yum install -y net-tools #安装后可以使用ifconfig命令
- 在容器里面查看IP地址，并进行ping测试
ifconfig #查看容器的IP地址
ping 对方的IP地址
5.部署master组件
- 在master上操作，api-server生成证书
[root@master k8s]# mkdir -p /opt/kubernetes/{cfg,bin,ssl} '//创建k8s工作目录'
[root@master k8s]# mkdir k8s-cert '//创建k8s证书目录'
[root@master k8s]# unzip master.zip -d /opt/kubernetes/ '//解压 maste.zip'
[root@master k8s]# ls /opt/k8s/
apiserver.sh bin cfg controller-manager.sh scheduler.sh ssl '//发现controller-manager.sh 没有执行权限'
[root@master k8s]# chmod +x /opt/kubernetes/controller-manager.sh '//给执行权限'
[root@master k8s]# cd k8s-cert/
[root@master k8s-cert]# vim k8s-cert.sh
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": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
#-----------------------
cat > server-csr.json <<EOF
{
"CN": "kubernetes",
"hosts": [
"10.0.0.1",
"127.0.0.1",
"192.168.233.131", '//master1，配置文件中要删除此类注释'
"192.168.233.130", '//master2'
"192.168.233.100", '//VIP'
"192.168.233.128", '//nginx代理master'
"192.168.233.129", '//nginx代理backup'
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server
#-----------------------
cat > admin-csr.json <<EOF
{
"CN": "admin",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
#-----------------------
cat > kube-proxy-csr.json <<EOF
{
"CN": "system:kube-proxy",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
'//为什么没有写node节点的IP地址？因为如果写了node节点IP地址，后期增加或者删除node节点的时候会非常麻烦'
- 生成证书
[root@master k8s-cert]# bash k8s-cert.sh '//生成证书'
[root@master k8s-cert]# ls
admin.csr admin.pem ca-csr.json k8s-cert.sh kube-proxy-key.pem server-csr.json
admin-csr.json ca-config.json ca-key.pem kube-proxy.csr kube-proxy.pem server-key.pem
admin-key.pem ca.csr ca.pem kube-proxy-csr.json server.csr server.pem
[root@master k8s-cert]# ls *.pem
admin-key.pem ca-key.pem kube-proxy-key.pem server-key.pem
admin.pem ca.pem kube-proxy.pem server.pem
[root@master k8s-cert]# cp ca*.pem server*.pem /opt/kubernets/ssl/ '//复制证书到工作目录'
[root@master k8s-cert]# ls /opt/kubernets/ssl/
ca-key.pem ca.pem server-key.pem server.pem
- 解压k8s服务器端压缩包
[root@master k8s-cert]# cd ..
[root@master k8s]# ls
cfssl.sh etcd-v3.3.10-linux-amd64 k8s-cert
etcd-cert etcd-v3.3.10-linux-amd64.tar.gz kubernetes-server-linux-amd64.tar.gz
etcd.sh flannel-v0.10.0-linux-amd64.tar.gz master.zip
[root@master k8s]# tar zxvf kubernetes-server-linux-amd64.tar.gz
- 复制服务器端关键命令到k8s工作目录中
[root@master k8s]# cd kubernetes/server/bin/
[root@master bin]# cp kube-controller-manager kube-scheduler kubectl kube-apiserver /opt/kubernets/bin/
[root@master bin]# ls /opt/kubernetes/bin/
kube-apiserver kube-controller-manager kubectl kube-scheduler
- 编辑令牌并绑定角色kubelet-bootstrap
[root@master bin]# cd /root/k8s/
[root@master k8s]# head -c 16 /dev/urandom | od -An -t x | tr -d '' '//随机生成序列号'
7ea8f86b 157225fd 4b927376 5e88a3ca
[root@master k8s]# vim /opt/kubernets/cfg/token.csv
7ea8f86b157225fd4b9273765e88a3ca,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
'//序列号，用户名，id，角色，这个用户是master用来管理node节点的'
- 开启apiserver，并将数据存放在etcd集群中并检查kube状态
[root@master kubernetes]# bash apiserver.sh 192.168.73.11 https://192.168.73.11:2379,https://192.168.73.12:2379,https://192.168.73.13:2379
[root@master kubernetes]# ls /opt/kubernetes/cfg/
kube-apiserver token.csv
[root@master kubernetes]# netstat -ntap |grep kube
[root@master kubernetes]# ps aux |grep kube
[root@master kubernetes]# vim /opt/kubernetes/cfg/kube-apiserver
...省略内容
--secure-port=6443 '//其实就是443，https协议通信端口'
...省略内容
[root@master kubernetes]# netstat -ntap |grep 6443
tcp 0 0 192.168.73.11:6443 0.0.0.0:* LISTEN 12636/kube-apiserve
tcp 0 0 192.168.73.11:40686 192.168.73.11:6443 ESTABLISHED 12636/kube-apiserve
tcp 0 0 192.168.73.11:6443 192.168.73.11:40686 ESTABLISHED 12636/kube-apiserve
- 启动scheduler服务
[root@master kubernetes]# ./scheduler.sh 127.0.0.1
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-scheduler.service to /usr/lib/systemd/system/kube-scheduler.service.
[root@master kubernetes]# systemctl status kube-scheduler
- 启动controller-manager
[root@master kubernetes]# ./controller-manager.sh 127.0.0.1
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-controller-manager.service to /usr/lib/systemd/system/kube-controller-manager.service.
[root@master kubernetes]# systemctl status kube-controller-manager
- 查看master节点状态
[root@master kubernetes]# /opt/kubernetes/bin/kubectl get cs '//发现是正常的，没问题'
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-2 Healthy {"health":"true"}
etcd-1 Healthy {"health":"true"}
etcd-0 Healthy {"health":"true"}
- node01节点部署
- master节点将kubectl和kube-proxy拷贝到node节点
[root@master kubernetes]# cd /root/k8s/kubernetes/server/bin/
[root@master bin]# ls
apiextensions-apiserver kube-apiserver.docker_tag kube-proxy
cloud-controller-manager kube-apiserver.tar kube-proxy.docker_tag
cloud-controller-manager.docker_tag kube-controller-manager kube-proxy.tar
cloud-controller-manager.tar kube-controller-manager.docker_tag kube-scheduler
hyperkube kube-controller-manager.tar kube-scheduler.docker_tag
kubeadm kubectl kube-scheduler.tar
kube-apiserver kubelet
[root@master bin]# scp kubelet kube-proxy root@192.168.73.12:/opt/k8s/bin
[root@master bin]# scp kubelet kube-proxy root@192.168.73.13:/opt/k8s/bin
- node节点解压node.zip
[root@node01 ~]# rz -E
rz waiting to receive.
[root@node01 ~]# ls
anaconda-ks.cfg flannel-v0.10.0-linux-amd64.tar.gz node.zip
[root@node01 ~]# unzip node.zip
[root@node01 ~]# ls
anaconda-ks.cfg flannel-v0.10.0-linux-amd64.tar.gz kubelet.sh node.zip proxy.sh
- master节点创建kubeconfig目录
[root@master bin]# cd /root/k8s/
[root@master k8s]# mkdir kubeconfig
[root@master k8s]# cd kubeconfig/
[root@master kubeconfig]# vim kubeconfig
APISERVER=$1
SSL_DIR=$2
# 创建kubelet bootstrapping kubeconfig
export KUBE_APISERVER="https://$APISERVER:6443"
# 设置集群参数
kubectl config set-cluster kubernetes
--certificate-authority=$SSL_DIR/ca.pem
--embed-certs=true
--server=${KUBE_APISERVER}
--kubeconfig=bootstrap.kubeconfig
# 设置客户端认证参数
kubectl config set-credentials kubelet-bootstrap
--token=7ea8f86b157225fd4b9273765e88a3ca '//此token序列号就是之前/opt/kubernetes/cfg/token.csv 文件中使用的的'
--kubeconfig=bootstrap.kubeconfig
# 设置上下文参数
kubectl config set-context default
--cluster=kubernetes
--user=kubelet-bootstrap
--kubeconfig=bootstrap.kubeconfig
# 设置默认上下文
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
#----------------------
# 创建kube-proxy kubeconfig文件
kubectl config set-cluster kubernetes
--certificate-authority=$SSL_DIR/ca.pem
--embed-certs=true
--server=${KUBE_APISERVER}
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy
--client-certificate=$SSL_DIR/kube-proxy.pem
--client-key=$SSL_DIR/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
[root@master kubeconfig]# export PATH=$PATH://opt/kubernetes/bin '//设置环境变量（可以写入到/etc/prlfile中）'
- 生成配置文件并拷贝到node节点
[root@master kubeconfig]# bash kubeconfig 192.168.73.11 /root/k8s/k8s-cert/
[root@master kubeconfig]# ls
bootstrap.kubeconfig kubeconfig kube-proxy.kubeconfig
[root@master kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.73.12:/opt/k8s/cfg
[root@master kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.73.13:/opt/k8s/cfg
- 创建bootstrap角色并赋予权限用于连接apiserver请求签名
[root@master kubeconfig]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created
- node01节点操作生成kubelet kubelet.config配置文件
[root@node01 ~]# vim kubelet.sh
'//将/opt/kubernetes路径都修改为/opt/k8s'
[root@node01 ~]# bash kubelet.sh 192.168.73.12
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@node01 ~]# ls /opt/k8s/cfg/
bootstrap.kubeconfig flanneld kubelet kubelet.config kube-proxy.kubeconfig
[root@node01 ~]# systemctl status kubelet
- master上检查到node01节点的请求，查看证书状态
[root@master kubeconfig]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s 71s kubelet-bootstrap Pending
'//pending：等待集群给该节点办法证书'
- 颁发证书，再次查看证书状态
[root@master kubeconfig]# kubectl certificate approve node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s
certificatesigningrequest.certificates.k8s.io/node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s approved
[root@master kubeconfig]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s 3m9s kubelet-bootstrap Approved,Issued '//已经被允许加入集群'
- 查看集群状态并启动proxy
[root@master kubeconfig]# kubectl get node '//如果有一个节点noready，检查kubelet，如果很多节点noready，那就检查apiserver，如果没问题再检查VIP地址，keepalived'
NAME STATUS ROLES AGE VERSION
192.168.73.12 Ready <none> 92s v1.12.3
[root@node01 ~]# vim proxy.sh '//修改配置文件，将/opt/kubernetes路径换成/opt/k8s'
[root@node01 ~]# bash proxy.sh 192.168.73.12
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.
[root@node01 ~]# systemctl status kube-proxy.service '//发现服务是running状态'
- node02节点部署
- 将node01之前生成的配置文件直接复制到node02
[root@node01 ~]# scp -r /opt/k8s/cfg/ root@192.168.73.13:/opt/k8s/cfg/
[root@node01 ~]# scp /usr/lib/systemd/system/{kubelet,kube-proxy}.service root@192.168.73.13:/usr/lib/systemd/system '//复制启动脚本过去'
- 修改三个配置文件的IP地址
[root@node02 ~]# cd /opt/k8s/cfg/
[root@node02 cfg]# vim kubelet
--hostname-override=192.168.73.13 '//修改为自己的IP地址'
[root@node02 cfg]# vim kubelet.config
address: 192.168.73.13
[root@node02 cfg]# vim kube-proxy
--hostname-override=192.168.73.13
- 启动服务并查看状态
[root@node02 cfg]# systemctl start kubelet
[root@node02 cfg]# systemctl enable kubelet
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@node02 cfg]# systemctl status kubelet
[root@node02 cfg]# systemctl start kube-proxy
[root@node02 cfg]# systemctl enable kube-proxy
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.
[root@node02 cfg]# systemctl status kube-proxy
- master上操作查看请求并同意node02证书
[root@master kubeconfig]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-A8BX2W67HKODPGvn0Q0dZ8Lr5Q8_2fXFt1O0STzZdis 74s kubelet-bootstrap Pending
node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s 21m kubelet-bootstrap Approved,Issued
[root@master kubeconfig]# kubectl certificate approve node-csr-A8BX2W67HKODPGvn0Q0dZ8Lr5Q8_2fXFt1O0STzZdis '//同意证书'
certificatesigningrequest.certificates.k8s.io/node-csr-A8BX2W67HKODPGvn0Q0dZ8Lr5Q8_2fXFt1O0STzZdis approved
[root@master kubeconfig]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-A8BX2W67HKODPGvn0Q0dZ8Lr5Q8_2fXFt1O0STzZdis 99s kubelet-bootstrap Approved,Issued
node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s 21m kubelet-bootstrap Approved,Issued
[root@master kubeconfig]# kubectl get node
NAME STATUS ROLES AGE VERSION
192.168.73.12 Ready <none> 19m v1.12.3
192.168.73.13 Ready <none> 44s v1.12.3
6.总结
-
回忆一下k8s单节点的部署流程
1.自签etcd的证书
2.etcd部署
3.node安装docker
4.flannel部署（先写入子网到etcd）
5.自签APIServer证书
6.部署APIServer组件（token，csv）
7.部署controller-manager（指定apiserver证书）和scheduler组件
8.生成kubeconfig（bootstrap,kubeconfig和kube-proxy.kubeconfig）
9.部署kubelet组件
10.部署kube-proxy组件
11.kubectl get csr && kubectl certificate approve允许办法证书
12.添加一个node节点
最后
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