mycat 容器中安装 keepalived

  • 假设为双 mycat

keeaplived 配置

看下 docker 的网络

  1. > docker network ls
  2. NETWORK ID          NAME                DRIVER              SCOPE
  3. 25fed3e4d30a        bridge              bridge              local
  4. 7b6fce5125a3        docker_gwbridge     bridge              local
  5. 36508b1e58ae        host                host                local
  6. dd6163d8125d        none                null                local

看下 docker_gwbridge 的 ip

ip addr

  2. -- other
  4. 4: docker_gwbridge: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
  5.     link/ether 02:42:3a:55:fc:08 brd ff:ff:ff:ff:ff:ff
  6.     inet 172.18.0.1/16 brd 172.18.255.255 scope global docker_gwbridge
  7.        valid_lft forever preferred_lft forever

配置

mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak vim /etc/keepalived/keepalived.conf

  1. vrrp_instance VI_1 {
  2.    state MASTER
  3.    # docker 的桥接网络 docker_gwbridge
  4.    interface docker_gwbridge
  5.    # 主备组可以保持一致
  6.    virtual_router_id 51
  7.    priority 100
  8.    # nopreempt
  9.    advert_int 1
  10.    authentication {
  11.        auth_type PASS
  12.        auth_pass 123456
  13.    }
  15.    virtual_ipaddress {
  16.      # docker_gwbridge 同网段 172.18.0.1 的虚拟ip
  17.      172.18.0.200
  18.    }
  19. }
  • 启动 keepalive

宿主机

  • swarm 网络内的虚拟 ip 无法被外网访问
    • 所以要把容器中的虚拟ip映射到宿主机，由宿主机负责接收外网请求，转发给虚拟ip

可以用负载均衡组件进行请求转发

keepalived 方式

  • 配置

    mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak vim /etc/keepalived/keepalived.conf

  1. vrrp_instance VI_1 {
  2.    state MASTER
  3.    interface docker_gwbridge
  4.       # 主备保持一致
  5.    virtual_router_id 51
  6.    priority 100
  7.    # nopreempt
  8.    advert_int 1
  9.    authentication {
  10.        auth_type PASS
  11.        auth_pass 123456
  12.    }
  14.    virtual_ipaddress {
  15.           # 面向外网的虚拟 ip
  16.        192.168.1.212
  17.    }
  18. }
  20. # 转发请求给 mycat 数据端口
  21. virtual_server 192.168.1.212 8066 {
  22.   # 心跳检测 s
  23.     delay_loop 3
  24.   # 轮询
  25.   lb_algo rr
  26.   # NAT 模式
  27.   lb_kind NAT
  28.   # 超时时间
  29.   persistence timeout 50
  30.   protocol TCP
  31.   # 转发给容器的虚拟 ip
  32.   real_server 172.18.0.200 8066 {
  33.       weight 1
  34.     }
  35. }
  37. # 转发请求给 mycat 控制端口
  38. virtual_server 192.168.1.212 9066 {
  39.     delay_loop 3
  40.   lb_algo rr
  41.   lb_kind NAT
  42.   persistence timeout 50
  43.   protocol TCP
  44.   real_server 172.18.0.200 9066 {
  45.       weight 1
  46.     }
  47. }

启动 keepalive