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Version: v5.6

Ubuntu keepalived配置

VIP要保证和当前机器ip在同一网段内。

借助 Keepalived 完成VIP配置

  • 安装Keepalived
apt-get -y install libssl-dev
apt-get -y install openssl
apt-get -y install libpopt-dev
apt-get -y install 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
$ vi /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
$ vi /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)

$ vi /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
  • 更改 Keepalived systemd 配置文件,添加两项配置

    添加两项参数

$  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 <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。