keepalived 的安装部署及使用详细完整版

た入场券 2024-02-24 06:28 17阅读 0赞

## 架构 ##

![在这里插入图片描述][6a453a81ce0a41fd95e88b27d6d2b82d.png]

## 1.安装 ##

yum install keepalived -y
    
    systemctl enable keepalived
     
    systemctl restart keepalived
    
    
    systemctl status keepalived

## 2.部署配置样例 ##

vim /etc/keepalived/keepalived.conf

global_defs {
        router_id PROXYSQL_HA
        script_user root
        enable_script_security
    }
    vrrp_script chk_proxysql_port {
        script "/etc/keepalived/check_proxysql.sh"
        interval 1
        weight -50
        fall 2
        rise 2
    }
    vrrp_instance VI_1 {
        state MASTER
        interface eth0
        mcast_src_ip 192.124.107.129 
        unicast_peer {
            192.124.126.109 
    
        }
        virtual_router_id 50
        priority 100
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1qaz2wsx
        }
        virtual_ipaddress {
            192.124.91.241/17 dev eth0 
        }
        track_script {
            chk_proxysql_port
        }
    }

检查脚本

#!/bin/bash
    /bin/netstat -na | grep -e '0.0.0.0:5432' &>/dev/null

### 全局定义块 ###

这部分主要用来设置Keepalived的故障通知机制和Router ID标识

global_defs {
        router_id PROXYSQL_HA
        script_user root
        enable_script_security
    }

### VRRP实例定义模块 ###

vrrp_instance VI_1 {
        state MASTER
        interface eth0
        mcast_src_ip 192.124.107.129  #当前机器
        unicast_peer {
            192.124.126.109   #另一台机器
    
        }
        virtual_router_id 50
        priority 100
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1qaz2wsx
        }
        virtual_ipaddress {
            192.124.91.241/17 dev eth0   # 设置虚拟ip，主节点自动添加
        }
        track_script {
            chk_proxysql_port
        }
    }

*  如果两节点的上联交换机禁用了组播，则只能采用vrrp单播通告的方式

mcast_src_ip 192.124.107.129  #当前机器
        unicast_peer {
            192.124.126.109   #另一台机器
    
        }

*  定义实例名称为VI\_1
 *  state 表示该实例的角色状态，有MASTER和BACKUP两种主备状态。
 *  interface 对外提供服务的网络接口eth0
 *  virtual\_router\_id 虚拟路由ID标识，主备服务器配置中相同实例的ID必须一致，否则将出现脑裂问题。
 *  priority表示实例优先级，数字越大，优先级越高。
 *  advert\_int为同步通知间隔。主备之间通信检查的时间间隔，默认为1秒。
 *  authentication 权限认证配置。
 *  virtual\_ipaddress 虚拟IP地址；可以配置多个IP，每个IP占一行。注意，这里的IP就是在工作中需要和域名绑定的ip，即可配置的高可用服务监听的ip保持一致。

## 3.切换日志分析 ##

### 日志查看方式 ###

tail -22f /var/log/messages | grep Keepalived

### 节点 192.160.200.3开启后备升为主 ###

Nov 14 14:47:52 192-168-3-193 Keepalived[225718]: Starting VRRP child process, pid=225719
    Nov 14 14:47:52 192-168-3-193 Keepalived_vrrp[225719]: Registering Kernel netlink reflector
    Nov 14 14:47:52 192-168-3-193 Keepalived_vrrp[225719]: Registering Kernel netlink command channel
    Nov 14 14:47:52 192-168-3-193 Keepalived_vrrp[225719]: Opening file '/etc/keepalived/keepalived.conf'.
    Nov 14 14:47:52 192-168-3-193 Keepalived_vrrp[225719]: Assigned address 192.160.200.3 for interface eth0
    Nov 14 14:47:52 192-168-3-193 Keepalived_vrrp[225719]: Assigned address fe80::f8a0:e0ff:fee8:b800 for interface eth0
    Nov 14 14:47:52 192-168-3-193 Keepalived_vrrp[225719]: Registering gratuitous ARP shared channel
    Nov 14 14:47:52 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) removing VIPs.
    Nov 14 14:47:52 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Entering BACKUP STATE (init)
    Nov 14 14:47:52 192-168-3-193 Keepalived_vrrp[225719]: VRRP sockpool: [ifindex(2), family(IPv4), proto(112), unicast(1), fd(11,12)]
    Nov 14 14:47:52 192-168-3-193 Keepalived_vrrp[225719]: VRRP_Script(chk_proxysql_port) succeeded
    Nov 14 14:51:04 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Backup received priority 0 advertisement
    Nov 14 14:51:05 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Receive advertisement timeout
    Nov 14 14:51:05 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Entering MASTER STATE
    Nov 14 14:51:05 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) setting VIPs.
    Nov 14 14:51:05 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:05 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Sending/queueing gratuitous ARPs on eth0 for 192.160.100.3
    Nov 14 14:51:05 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:05 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:05 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:05 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:06 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Master received advert from 192.160.220.118 with same priority 100 but higher IP address than ours
    Nov 14 14:51:06 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Entering BACKUP STATE
    Nov 14 14:51:06 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) removing VIPs.
    Nov 14 14:51:51 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) received lower priority (50) advert from 192.160.220.118 - discarding
    Nov 14 14:51:52 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) received lower priority (50) advert from 192.160.220.118 - discarding
    Nov 14 14:51:53 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) received lower priority (50) advert from 192.160.220.118 - discarding
    Nov 14 14:51:54 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Receive advertisement timeout
    Nov 14 14:51:54 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Entering MASTER STATE
    Nov 14 14:51:54 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) setting VIPs.
    Nov 14 14:51:54 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:54 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Sending/queueing gratuitous ARPs on eth0 for 192.160.100.3
    Nov 14 14:51:54 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:54 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:54 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:54 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:59 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:59 192-168-3-193 Keepalived_vrrp[225719]: (VI_1) Sending/queueing gratuitous ARPs on eth0 for 192.160.100.3
    Nov 14 14:51:59 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:59 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:59 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:51:59 192-168-3-193 Keepalived_vrrp[225719]: Sending gratuitous ARP on eth0 for 192.160.100.3

### 节点 192.160.220.118开启后主降为备 ###

关掉服务触发

Nov 14 14:47:51 192-160-220-118 Keepalived[20622]: Starting Keepalived v1.3.5 (03/19,2017), git commit v1.3.5-6-g6fa32f2
    Nov 14 14:47:51 192-160-220-118 Keepalived[20622]: Opening file '/etc/keepalived/keepalived.conf'.
    Nov 14 14:47:51 192-160-220-118 Keepalived[20623]: Starting Healthcheck child process, pid=20624
    Nov 14 14:47:51 192-160-220-118 Keepalived[20623]: Starting VRRP child process, pid=20625
    Nov 14 14:47:51 192-160-220-118 Keepalived_vrrp[20625]: Registering Kernel netlink reflector
    Nov 14 14:47:51 192-160-220-118 Keepalived_vrrp[20625]: Registering Kernel netlink command channel
    Nov 14 14:47:51 192-160-220-118 Keepalived_vrrp[20625]: Registering gratuitous ARP shared channel
    Nov 14 14:47:51 192-160-220-118 Keepalived_vrrp[20625]: Opening file '/etc/keepalived/keepalived.conf'.
    Nov 14 14:47:51 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Instance(VI_1) removing protocol VIPs.
    Nov 14 14:47:51 192-160-220-118 Keepalived_vrrp[20625]: Using LinkWatch kernel netlink reflector...
    Nov 14 14:47:51 192-160-220-118 Keepalived_vrrp[20625]: VRRP sockpool: [ifindex(2), proto(112), unicast(1), fd(10,11)]
    Nov 14 14:47:51 192-160-220-118 Keepalived_healthcheckers[20624]: Opening file '/etc/keepalived/keepalived.conf'.
    Nov 14 14:47:51 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Script(chk_proxysql_port) succeeded
    Nov 14 14:47:51 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Instance(VI_1) Transition to MASTER STATE
    Nov 14 14:47:52 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Instance(VI_1) Entering MASTER STATE
    Nov 14 14:47:52 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Instance(VI_1) setting protocol VIPs.
    Nov 14 14:47:52 192-160-220-118 Keepalived_vrrp[20625]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:47:52 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth0 for 192.160.100.3
    Nov 14 14:47:52 192-160-220-118 Keepalived_vrrp[20625]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:47:52 192-160-220-118 Keepalived_vrrp[20625]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:47:52 192-160-220-118 Keepalived_vrrp[20625]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:47:52 192-160-220-118 Keepalived_vrrp[20625]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:47:57 192-160-220-118 Keepalived_vrrp[20625]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:47:57 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth0 for 192.160.100.3
    Nov 14 14:47:57 192-160-220-118 Keepalived_vrrp[20625]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:47:57 192-160-220-118 Keepalived_vrrp[20625]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:47:57 192-160-220-118 Keepalived_vrrp[20625]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:47:57 192-160-220-118 Keepalived_vrrp[20625]: Sending gratuitous ARP on eth0 for 192.160.100.3
    Nov 14 14:48:34 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:35 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:35 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Script(chk_proxysql_port) failed
    Nov 14 14:48:36 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Instance(VI_1) Changing effective priority from 100 to 50
    Nov 14 14:48:36 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:37 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:38 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:39 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:39 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Instance(VI_1) Received advert with higher priority 100, ours 50
    Nov 14 14:48:39 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Instance(VI_1) Entering BACKUP STATE
    Nov 14 14:48:39 192-160-220-118 Keepalived_vrrp[20625]: VRRP_Instance(VI_1) removing protocol VIPs.
    Nov 14 14:48:40 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:41 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:42 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:43 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:44 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1
    Nov 14 14:48:45 192-160-220-118 Keepalived_vrrp[20625]: /etc/keepalived/check_proxysql.sh exited with status 1

[6a453a81ce0a41fd95e88b27d6d2b82d.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/24/94efbb5affc24e6b84fcb8c63e981b5f.png