部署 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
从节点配置文件
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 <VIP>
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。