Rancher之HA部署

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://z34wtdhg.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

Docker镜像加速

rancher-server01 172.16.138.126

rancher-server02 172.16.138.127

rancher-mysql和Haproxy 172.16.138.128

1、搭建Mysql数据库（搭建Mysql过程忽略）

搭建要求：

• 至少 1 GB内存
• 每个Rancher Server节点需要50个连接 (例如：3个节点的Rancher则需要至少150个连接)

Mysql创建库和用户

CREATE DATABASE IF NOT EXISTS cattle COLLATE = 'utf8_general_ci' CHARACTER SET = 'utf8';
GRANT ALL ON cattle.* TO 'cattle'@'%' IDENTIFIED BY 'cattle';
GRANT ALL ON cattle.* TO 'cattle'@'localhost' IDENTIFIED BY 'cattle';

2、搭建Docker(搭建docker忽略)

搭建要求：

• 对于 RHEL/CentOS, 默认的 storage driver, 例如 devicemapper using loopback, 并不被Docker推荐。 请参考我博客中docker安装优化的Docker的官方文档文档去修改使用其他的storage driver。
• 9345, 8080 端口需要在各个节点之间能够互相访问
• 1GB内存

启动rancher镜像

docker run -d --restart=unless-stopped -p 8080:8080 -p 9345:9345 rancher/server:v1.6.2 
     --db-host 172.16.138.128 --db-port 3306 --db-user cattle --db-pass cattle --db-name cattle 
     --advertise-address 172.16.138.127
　　
　　--db-host指mysqlIP
　　--db-port指mysql端口 
　　--db-user指用户cattle
　　--db-pass指用户的密码cattle
   --advertise-addresszhi指当前server的IP

3、搭建haproxy

启动haproxy

配置文件

global
  maxconn 4096
  ssl-server-verify none

defaults
  mode http
  balance roundrobin
  option redispatch
  option forwardfor

  timeout connect 5s
  timeout queue 5s
  timeout client 36000s
  timeout server 36000s

frontend http-in
  mode http
#  bind *:443 ssl crt /etc/haproxy/certificate.pem
  bind *:80
  default_backend rancher_servers

  # Add headers for SSL offloading
#  http-request set-header X-Forwarded-Proto https if { ssl_fc }
#  http-request set-header X-Forwarded-Ssl on if { ssl_fc }

  acl is_websocket hdr(Upgrade) -i WebSocket
  acl is_websocket hdr_beg(Host) -i ws
  use_backend rancher_servers if is_websocket

backend rancher_servers
  server websrv1 172.16.138.126:8080 weight 1 maxconn 1024
  server websrv2 172.16.138.127:8080 weight 1 maxconn 1024

启动

nohup haproxy -f /etc/haproxy/haproxy.cfg &