Keepalived安装部署
- 下载地址:
点我下载 - 通过ftp工具上传到linux中,/home/software
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- 解压
tar -zxvf keepalived-2.0.18.tar.gz
- 解压后进入到解压出来的目录,看到会有 configure ,那么就可以做配置了(配置安装和nginx一模一样)
- 通过命令 vim keepalived.conf 打开配置文件
global_defs { # 路由id:当前安装keepalived的节点主机标识符,保证全局唯一 router_id keep_171 } vrrp_instance VI_1 { # 表示状态是MASTER主机还是备用机BACKUP state MASTER # 该实例绑定的网卡 interface ens33 # 保证主备节点一致即可 virtual_router_id 51 # 权重,master权重一般高于backup,如果有多个,那就是选举,谁的权重高,谁就当选 priority 100 # 主备之间同步检查时间间隔,单位秒 advert_int 2 # 认证权限密码,防止非法节点进入 authentication { auth_type PASS auth_pass 1111 } # 虚拟出来的ip,可以有多个(vip) virtual_ipaddress { 192.168.1.161 } }
附:查看网卡名称
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- 启动 Keepalived
在sbin目录中进行启动(同nginx),如下图:
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- 通过命令 vim keepalived.conf 打开配置文件
global_defs { router_id keep_172 } vrrp_instance VI_1 { # 备用机设置为BACKUP state BACKUP interface ens33 virtual_router_id 51 # 权重低于MASTER priority 80 advert_int 2 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { # 注意:主备两台的vip都是一样的,绑定到同一个vip 192.168.1.161 } }
- 启动 Keepalived
# 启动keepalived systemctl start keepalived # 停止keepalived systemctl stop keepalived # 重启keepalived systemctl restart keepalived
- 查看进程
ps -ef|grep keepalived
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- 增加Nginx重启检测脚本
vim /etc/keepalived/check_nginx_alive_or_not.sh
#!/bin/bash A=`ps -C nginx --no-header |wc -l` # 判断nginx是否宕机,如果宕机了,尝试重启 if [ $A -eq 0 ]; then /usr/local/nginx/sbin/nginx # 等待一小会再次检查nginx,如果没有启动成功,则停止keepalived,使其启动备用机 sleep 3 if [ `ps -C nginx --no-header |wc -l` -eq 0 ]; then killall keepalived fi fi
增加运行权限
chmod +x /etc/keepalived/check_nginx_alive_or_not.sh
- 配置keepalived监听nginx脚本
vrrp_script check_nginx_alive { script "/etc/keepalived/check_nginx_alive_or_not.sh" interval 2 # 每隔两秒运行上一行脚本 weight 10 # 如果脚本运行失败,则升级权重+10 }
- 在 vrrp_instance 中新增监控的脚本
track_script { check_nginx_alive # 追踪 nginx 脚本 }
- 重启Keepalived使得配置文件生效
systemctl restart keepalived
规则:以一个虚拟ip分组归为同一个路由
主节点配置:
global_defs {
router_id keep_171
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.161
}
}
vrrp_instance VI_2 {
state BACKUP
interface ens33
virtual_router_id 52
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.162
}
}
【Keepalived】备用节点配置
global_defs {
router_id keep_172
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.161
}