部署 Keepalived

部署 Keepalived - 图1warning

局域网内交换机需要支持 VRRP 协议，否则 Keepalived 无法正常工作。

部署 Keepalived

在所有网关节点安装 Keepalived

CentOS

  1. yum install -y keepalived

Ubuntu

  1. apt-get -y install libssl-dev
  2. apt-get -y install openssl
  3. apt-get -y install libpopt-dev
  4. apt-get -y install keepalived

修改 Keepalived 配置文件

部署 Keepalived - 图2caution

注意！当前调用健康监测脚本内容为注释状态，原因是在安装 Rainbond 前 需要确保 VIP 已经存在；在 Rainbond 安装完成之后需将注释取消，才能实现健康监测，确保 网关高可用。

主节点配置文件

vim /etc/keepalived/keepalived.conf

  2. ! Configuration File for keepalived
  4. global_defs {
  5.    router_id LVS_DEVEL
  6. }
  7. #vrrp_script check_gateway {
  8. # 检测脚本
  9. #   script "/etc/keepalived/check_gateway_status.sh"
  10. # 执行间隔时间
  11. #   interval 5
  12. #}
  13. vrrp_instance VI_1 {
  15.     #因使用非抢占模式，这里都为backup
  16.     state BACKUP 
  17.     #网卡设备名，通过 ifconfig 命令确定  
  18.     interface ens6f0       
  19.     virtual_router_id 51
  20.     #优先级，主节点大于备节点     
  21.     priority 100    
  22.     advert_int 1
  23.     #非抢占模式
  24.     nopreempt
  25.     authentication {
  26.         auth_type PASS
  27.         auth_pass 1111
  28.     }
  29.     virtual_ipaddress {
  30.         <VIP>               
  31.      }
  32. #     track_script {
  33. #    check_gateway
  34. #   }
  35. }
  36. ``` 从节点配置文件
  38. vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs { router_id LVS_DEVEL }

vrrp_script check_gateway {

检测脚本

script “/etc/keepalived/check_gateway_status.sh”

执行间隔时间

interval 5

}

  1. vrrp_instance VI_1 {
  2. #因使用非抢占模式，这里都为backup
  3. state BACKUP 
  4. #网卡设备名，通过 ifconfig 命令确定   
  5. interface ens6f0
  6. virtual_router_id 51
  7. #优先级，主节点大于备节点   
  8. priority 50
  9. advert_int 1
  10. #非抢占模式
  11. nopreempt
  12. authentication {
  13.     auth_type PASS
  14.     auth_pass 1111
  15. }
  16. virtual_ipaddress {
  17.     <VIP>           
  18. }

track_script {

check_gateway

}

}

  2. ### 健康监测脚本
  4. 扩展对网关节点健康检查的脚本，脚本的功能是当 rbd-gateway 组件停止服务，则关闭本机的 Keepalived，切换 VIP 。(主从都需操作)

$ vim /etc/keepalived/check_gateway_status.sh

!/bin/bash

/usr/bin/curl -I http://localhost:10254/healthz

if [ $? -ne 0 ]; then cat /var/run/keepalived.pid | xargs kill fi

添加执行权限

$ chmod +x /etc/keepalived/check_gateway_status.sh

  2. ### 修改 Keepalived Systemd 配置文件
  4. 更改 Keepalived systemd 配置文件，添加两项配置 `Restart` `RestartSec` ，保证 Keepalived 服务异常退出后自动重启。
  6. vi /lib/systemd/system/keepalived.service

/lib/systemd/system/keepalived.service

[Unit] Description=Keepalive Daemon (LVS and VRRP) After=network-online.target Wants=network-online.target

Only start if there is a configuration file

ConditionFileNotEmpty=/etc/keepalived/keepalived.conf [Service] Type=forking KillMode=process PIDFile=/var/run/keepalived.pid

Read configuration variable file if it is present

EnvironmentFile=-/etc/default/keepalived ExecStart=/usr/sbin/keepalived $DAEMON_ARGS ExecReload=/bin/kill -HUP $MAINPID

总是重启该服务

Restart=always

重启间隔时间

RestartSec=10

[Install] WantedBy=multi-user.target

  2. ### 启动 Keepalived 服务
  4. 启动服务并设置开机自启动

systemctl start keepalived systemctl enable keepalived systemctl status keepalived

  2. ### 检测 VIP 是否启动

ip a |grep ```

部署 Keepalived - 图3warning

在进行下一步操作前请确保 VIP 已经存在，如果 VIP 不存在，请重新审查本节操作；在 Rainbond 安装完成之后请将配置文件中注释取消并重启 Keepalived 服务，实现健康监测，以此确保 网关高可用。