CentOS Keepalived配置

    借助 Keepalived 完成VIP配置

    • 在网关节点安装 Keepalived
    1. $ yum install -y keepalived
    • 编辑配置文件

      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
    1. $ vi /etc/keepalived/keepalived.conf
    2. ! Configuration File for keepalived
    3. global_defs {
    4. router_id LVS_DEVEL
    5. }
    6. #vrrp_script check_gateway {
    7. # 检测脚本
    8. # script "/etc/keepalived/check_gateway_status.sh"
    9. # 执行间隔时间
    10. # interval 5
    11. #}
    12. vrrp_instance VI_1 {
    13. #因使用非抢占模式,这里都为backup
    14. state BACKUP
    15. #网卡设备名,通过 ifconfig 命令确定
    16. interface ens6f0
    17. virtual_router_id 51
    18. #优先级,主节点大于备节点
    19. priority 100
    20. advert_int 1
    21. #非抢占模式
    22. nopreempt
    23. authentication {
    24. auth_type PASS
    25. auth_pass 1111
    26. }
    27. virtual_ipaddress {
    28. <VIP>
    29. }
    30. # track_script {
    31. # check_gateway
    32. # }
    33. }
    • 从节点
    1. $ vi /etc/keepalived/keepalived.conf
    2. ! Configuration File for keepalived
    3. global_defs {
    4. router_id LVS_DEVEL
    5. }
    6. #vrrp_script check_gateway {
    7. # 检测脚本
    8. # script "/etc/keepalived/check_gateway_status.sh"
    9. # 执行间隔时间
    10. # interval 5
    11. # }
    12. vrrp_instance VI_1 {
    13. #因使用非抢占模式,这里都为backup
    14. state BACKUP
    15. #网卡设备名,通过 ifconfig 命令确定
    16. interface ens6f0
    17. virtual_router_id 51
    18. #优先级,主节点大于备节点
    19. priority 50
    20. advert_int 1
    21. #非抢占模式
    22. nopreempt
    23. authentication {
    24. auth_type PASS
    25. auth_pass 1111
    26. }
    27. virtual_ipaddress {
    28. <VIP>
    29. }
    30. # track_script {
    31. # check_gateway
    32. # }
    33. }
    • 健康监测脚本

    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)

    1. $ vi /etc/keepalived/check_gateway_status.sh
    2. #!/bin/bash
    3. /usr/bin/curl -I http://localhost:10254/healthz
    4. if [ $? -ne 0 ];then
    5. cat /var/run/keepalived.pid | xargs kill
    6. fi

    添加执行权限

    1. $ chmod +x /etc/keepalived/check_gateway_status.sh
    • 更改 Keepalived systemd 配置文件,添加两项配置

      添加两项参数

    1. $ vi /lib/systemd/system/keepalived.service
    2. # /lib/systemd/system/keepalived.service
    3. [Unit]
    4. Description=Keepalive Daemon (LVS and VRRP)
    5. After=network-online.target
    6. Wants=network-online.target
    7. # Only start if there is a configuration file
    8. ConditionFileNotEmpty=/etc/keepalived/keepalived.conf
    9. [Service]
    10. Type=forking
    11. KillMode=process
    12. PIDFile=/var/run/keepalived.pid
    13. # Read configuration variable file if it is present
    14. EnvironmentFile=-/etc/default/keepalived
    15. ExecStart=/usr/sbin/keepalived $DAEMON_ARGS
    16. ExecReload=/bin/kill -HUP $MAINPID
    17. # 总是重启该服务
    18. Restart=always
    19. # 重启间隔时间
    20. RestartSec=10
    21. [Install]
    22. WantedBy=multi-user.target
    • 启动服务

      启动服务并设置开机自启动

    1. systemctl start keepalived
    2. systemctl enable keepalived
    3. systemctl status keepalived
    • 检测 VIP 是否启动
    1. ip a |grep <VIP>

    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。