初始化系统

每台机器都要操作

# 关闭防火墙
systemctl stop firewalld.service
systemctl disable firewalld
firewall-cmd --reload
# 关闭selinux
setenforce 0  # 临时
sed -i 's/enforcing/disabled/' /etc/selinux/config  # 永久
# 关闭swap
swapoff -a  # 临时
sed -ri 's/.*swap.*/#&/' /etc/fstab    # 永久
# 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 = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system  # 生效
#安装chrony
yum -y install chrony
#修改同步服务器地址为阿里云
sed -i.bak '3,6d' /etc/chrony.conf && sed -i '3cserver ntp1.aliyun.com iburst' \
/etc/chrony.conf
# 启动chronyd及加入开机自启
systemctl start chronyd && systemctl enable chronyd
#查看同步结果
chronyc sources

安装docker

每台机器都要操作

# 下载docker压缩包
https://download.docker.com/linux/static/stable/x86_64/docker-19.03.11.tgz
# 解压二进制包、移动加压文件
tar zxvf docker-19.03.11.tgz
mv docker/* /usr/bin
# 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=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
[Install]
WantedBy=multi-user.target
EOF
#创建配置文件   
mkdir /etc/docker
cat > /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"],
  "insecure-registries": ["172.18.69.205:80"],
  "log-opts": {"max-size":"2g", "max-file":"100"}
}
EOF
#启动并设置开机启动
systemctl daemon-reload
systemctl start docker
systemctl enable docker

新增rancher操作用户

每台机器都要操作

新建用户 
groupadd docker
useradd rancher -G docker
#设置es用户的密码为5W3R1gjHfg
passwd  rancher 
vi /etc/sudoers
# 增加一行记录
rancher ALL=(ALL)       NOPASSWD: ALL
# 生效  
sysctl --system

选择一台机器特色处理

选择一台机器安装rke，kubectl，helm，对其他机器免密登录

# 免密登录
su - rancher
ssh-keygen
ssh-copy-id rancher@外网ip1
ssh-copy-id rancher@外网ip2
ssh-copy-id rancher@外网ip3
# root用户下，执行如下操作：
# 1、下载rke文件并移动到/usr/sbin
wget https://github.com/rancher/rke/releases/download/v1.1.2/rke_linux-amd64 \
&& chmod +x rke_linux-amd64 \
&& mv rke_linux-amd64 /usr/bin/rke
# 2、安装kubectl
wget https://docs.rancher.cn/download/kubernetes/linux-amd64-v1.18.3-kubectl \
&&  chmod +x linux-amd64-v1.18.3-kubectl \
&&  mv linux-amd64-v1.18.3-kubectl /usr/bin/kubectl
# 3、安装helm
wget https://docs.rancher.cn/download/helm/helm-v3.0.3-linux-amd64.tar.gz \
&&   tar xf helm-v3.0.3-linux-amd64.tar.gz  \
&&   cd linux-amd64 \
&&   mv helm  /usr/sbin/

在/home/rancher目录设置rancher-cluster.yml配置文件

nodes:
  - address: ip地址
    internal_address: ip地址
    user: rancher
    role: [controlplane, worker, etcd]
    port: 22
  - address: ip地址
    internal_address: ip地址
    user: rancher
    role: [controlplane, worker, etcd]
    port: 22
  - address: ip地址
    internal_address: ip地址
    user: rancher
    role: [controlplane, worker, etcd]
    port: 22
services:
  etcd:
    snapshot: true
    creation: 6h
    retention: 24h
ignore_docker_version: true
cluster_name: mycluster
ingress:
  provider: nginx
  options:
    use-forwarded-headers: "true"

rke部署k8s

rancher用户下执行：
cd /home/rancher
rke up --config ./rancher-cluster.yml
# 新生成的集群文件，用来执行kubectl
mkdir -p /home/rancher/.kube
cp kube_config_rancher-cluster.yml  $HOME/.kube/config
# 检查
kubectl get nodes
kubectl get pods --all-namespaces

安装 cert-manager

# 安装 CustomResourceDefinition 资源
kubectl apply --validate=false -f https://github.com/jetstack/cert-manager/releases/download/v0.15.0/cert-manager.crds.yaml
# **重要：**
# 如果您正在运行 Kubernetes v1.15 或更低版本，
# 则需要在上方的 kubectl apply 命令中添加`--validate=false`标志，
# 否则您将在 cert-manager 的 CustomResourceDefinition 资源中收到与
# x-kubernetes-preserve-unknown-fields 字段有关的验证错误。
# 这是一个良性错误，是由于 kubectl 执行资源验证的方式造成的。
# 为 cert-manager 创建命名空间
kubectl create namespace cert-manager
# 添加 Jetstack Helm 仓库
helm repo add jetstack https://charts.jetstack.io
# 更新本地 Helm chart 仓库缓存
helm repo update
# 安装 cert-manager Helm chart
helm install \
 cert-manager jetstack/cert-manager \
 --namespace cert-manager \
 --version v0.15.0

安装完 cert-manager 后，您可以通过检查 cert-manager 命名空间中正在运行的 Pod 来验证它是否已正确部署：

kubectl get pods --namespace cert-manager
NAME READY STATUS RESTARTS AGE
cert-manager-5c6866597-zw7kh 1/1 Running 0 2m
cert-manager-cainjector-577f6d9fd7-tr77l 1/1 Running 0 2m
cert-manager-webhook-787858fcdb-nlzsq 1/1 Running 0 2m

通过helm安装 Rancher

# 添加helm仓库
helm repo add rancher-stable https://releases.rancher.com/server-charts/stable
# 创建命名空间
kubectl create namespace cattle-system
helm install rancher rancher-stable/rancher \
 --namespace cattle-system \
 --set hostname=rancher.demo.com
kubectl -n cattle-system rollout status deploy/rancher
kubectl -n cattle-system get deploy rancher

新增nginx

docker pull nginx:1.15
mkdir -p /opt/nginx/cert
# 生成证书
cd /opt/nginx/cert
chmod +x create_self-signed-cert.sh
 ./create_self-signed-cert.sh --ssl-domain=demo.jmj1995.com --ssl-trusted-ip=8.129.116.194 --ssl-size=2048 --ssl-date=3650
docker run --name nginx01 -d   -p 80:80 -p 443:443  nginx:1.15
docker cp nginx01:/etc/nginx /opt
docker rm -f nginx01
docker exec -it nginx01 /bin/bash
# 修改default.conf
upstream rancher {
        server 8.129.69.137:80;
        server 8.129.145.169:80;
        server 8.129.115.152:80;
    }
map $http_upgrade $connection_upgrade {
    default Upgrade;
    ''      close;
}
server {
    listen 443 ssl http2;
    server_name rancher.jmj1995.com;
    ssl_certificate /etc/nginx/cert/tls.crt;
    ssl_certificate_key /etc/nginx/cert/tls.key;
    location / {
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Port $server_port;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://rancher;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        # 这里将允许您在 Rancher UI 中打开命令行窗口时，窗口可以保留最多15分钟。没有这个参数时，默认值为1分钟，一分钟后在Rancher>中的shell会自动关闭。
        proxy_read_timeout 900s;
        proxy_buffering off;
    }
}
server {
    listen 80;
    server_name rancher.jmj1995.com;
    return 301 https://$server_name$request_uri;
}
#  运行nginx
docker run -it -d --name mynginx -p 80:80 -p 443:443 -v /opt/nginx/:/etc/nginx/   -v /opt/nginx/logs:/var/log/nginx  nginx:1.15