Deploy Keepalived

warning

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

yum install -y keepalived

Ubuntu

apt-get -y install libssl-dev
apt-get -y install openssl
apt-get -y install libpopt-dev
apt-get -y install keepalived

修改 Keepalived 配置文件

caution

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

! 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
#}
vrrp_instance VI_1 {
    #因使用非抢占模式，这里都为backup
    state BACKUP 
    #网卡设备名，通过 ifconfig 命令确定  
    interface ens6f0       
    virtual_router_id 51
    #优先级，主节点大于备节点     
    priority 100    
    advert_int 1
    #非抢占模式
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        <VIP>               
     }
#     track_script {
#    check_gateway
#   }
}
``` 从节点配置文件
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

}

vrrp_instance VI_1 {
#因使用非抢占模式，这里都为backup
state BACKUP 
#网卡设备名，通过 ifconfig 命令确定   
interface ens6f0
virtual_router_id 51
#优先级，主节点大于备节点   
priority 50
advert_int 1
#非抢占模式
nopreempt
authentication {
    auth_type PASS
    auth_pass 1111
}
virtual_ipaddress {
    <VIP>           
}

track_script {

check_gateway

}

}

### 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)

$ 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

### 修改 Keepalived Systemd 配置文件
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。
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

### 启动 Keepalived 服务
启动服务并设置开机自启动

systemctl start keepalived systemctl enable keepalived systemctl status keepalived

### 检测 VIP 是否启动

ip a |grep ```

warning

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。