KeepAlived 搭建高可用的HAProxy集群

KeepAlived 简介

Keepalived，它是一个高性能的服务器高可用或热备解决方案，Keepalived主要来防止服务器单点故障的发生问题，可以通过其与Nginx、Haproxy等反向代理的负载均衡服务器配合实现web服务端的高可用。Keepalived以VRRP协议为实现基础，用VRRP协议来实现高可用性（HA）.VRRP（Virtual Router Redundancy Protocol）协议是用于实现路由器冗余的协议，VRRP协议将两台或多台路由器设备虚拟成一个设备，对外提供虚拟路由器IP（一个或多个）。

KeepAlived 的安装

#安装所需软件包
yum install -y openssl openssl-devel
#下载安装包
wget http://www.keepalived.org/software/keepalived-1.2.18.tar.gz
#解压、编译、安装
tar -zxvf keepalived-1.2.18.tar.gz -C /usr/local/
cd /usr/local/keepalived-1.2.18/ && ./configure --prefix=/usr/local/keepalived
make && make install
# 将keepalived安装成Linux系统服务，因为没有使用keepalived的默认安装路径（默认路径：/usr/local）,安装完成之后，需要做一些修改工作
#首先创建文件夹，将keepalived配置文件进行复制：
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
#然后复制keepalived脚本文件：
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
# 设置的过程中如果出现已经存在则删除原有的文件,重新创建
ln -s -f /usr/local/sbin/keepalived /usr/sbin/
ln -s -f /usr/local/keepalived/sbin/keepalived /sbin/
#可以设置开机启动：chkconfig keepalived on，到此我们安装完毕!
chkconfig keepalived on

KeepAlived 的配置

[root@nacos keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
   router_id other  ##标识节点的字符串，通常为本机hostname
}
vrrp_script chk_haproxy {
    script "/etc/keepalived/haproxy_check.sh"  ##执行脚本位置
    interval 2  ##检测时间间隔
    weight -20  ##如果条件成立则权重减20
}
vrrp_instance VI_1 {
    state BACKUP  ## 主节点为MASTER，备份节点为BACKUP-该配置非常重要
    interface ens192 ## 绑定虚拟IP的网络接口（网卡可以使用ifconfig查看）
    virtual_router_id 110  ## 虚拟路由ID号（主备节点一定要相同）-该配置非常重要
    mcast_src_ip 192.168.1.118 ## 本机ip地址
    priority 150  ##优先级配置（0-254的值）,一般主节点的权重大于备份节点
    nopreempt
    advert_int 1  ## 组播信息发送间隔，俩个节点必须配置一致，默认1s
authentication {  ## 认证匹配
        auth_type PASS
        auth_pass dalianpai
    }
    track_script {
        chk_haproxy
    }
    virtual_ipaddress {
        192.168.1.199  ## 虚拟ip，可以指定多个,以后连接mq就使用该虚拟ip进行连接
    }
}
[root@nacos keepalived]#

4.编写执行脚本(一定要赋权否则不能执行)

[root@nacos keepalived]# cat haproxy_check.sh
#!/bin/bash
COUNT=`ps -C haproxy --no-header |wc -l`
if [ $COUNT -eq 0 ];then
    /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
    sleep 2
    if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then
        killall keepalived
    fi
fi
[root@nacos keepalived]#

启动

[root@other keepalived]# chmod +x /etc/keepalived/haproxy_check.sh
[root@other keepalived]# service keepalived start
Starting keepalived (via systemctl):                       [  OK  ]
[root@other keepalived]# ps -ef | grep haproxy
nobody    2143     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2144     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2145     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2146     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2147     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2148     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2149     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2150     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2151     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2152     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2153     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2154     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2155     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2156     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2157     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2158     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2159     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2160     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2161     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
nobody    2162     1  0 Jul08 ?        00:00:02 /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
root      3713  1754  0 02:45 pts/0    00:00:00 grep --color=auto haproxy
[root@other keepalived]# ps -ef | grep keepalived
root      3669     1  0 02:44 ?        00:00:00 keepalived -D
root      3670  3669  0 02:44 ?        00:00:00 keepalived -D
root      3671  3669  0 02:44 ?        00:00:00 keepalived -D
root      3718  1754  0 02:45 pts/0    00:00:00 grep --color=auto keepalived
[root@other keepalived]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:50:56:b4:2f:fe brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.121/24 brd 192.168.1.255 scope global noprefixroute ens192
       valid_lft forever preferred_lft forever
    inet 192.168.1.199/32 scope global ens192
       valid_lft forever preferred_lft forever
    inet6 fe80::c1bd:70bd:56f9:d8f5/64 scope link tentative noprefixroute dadfailed
       valid_lft forever preferred_lft forever
    inet6 fe80::2e50:2dd3:3d4d:2c2e/64 scope link tentative noprefixroute dadfailed
       valid_lft forever preferred_lft forever
    inet6 fe80::68b:4e0e:e486:8dd8/64 scope link tentative noprefixroute dadfailed
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:2a:41:5e:74 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
[root@other keepalived]# service keepalived stop
Stopping keepalived (via systemctl):                       [  OK  ]
[root@other keepalived]# systemctl start keepalived
[root@other keepalived]# systemctl status keepalived
● keepalived.service - SYSV: Start and stop Keepalived
   Loaded: loaded (/etc/rc.d/init.d/keepalived; bad; vendor preset: disabled)
   Active: active (running) since Thu 2020-07-09 02:54:17 EDT; 6s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 3869 ExecStop=/etc/rc.d/init.d/keepalived stop (code=exited, status=0/SUCCESS)
  Process: 3888 ExecStart=/etc/rc.d/init.d/keepalived start (code=exited, status=0/SUCCESS)
 Main PID: 3895 (keepalived)
    Tasks: 3
   Memory: 904.0K
   CGroup: /system.slice/keepalived.service
           ├─3895 keepalived -D
           ├─3896 keepalived -D
           └─3897 keepalived -D

Jul 09 02:54:17 other Keepalived_vrrp[3897]: Opening file '/etc/keepalived/keepalived.conf'.
Jul 09 02:54:17 other Keepalived_vrrp[3897]: Truncating auth_pass to 8 characters
Jul 09 02:54:17 other Keepalived_vrrp[3897]: Configuration is using : 67374 Bytes
Jul 09 02:54:17 other Keepalived_vrrp[3897]: Using LinkWatch kernel netlink reflector...
Jul 09 02:54:17 other Keepalived_vrrp[3897]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]
Jul 09 02:54:17 other Keepalived_healthcheckers[3896]: Using LinkWatch kernel netlink reflector...
Jul 09 02:54:17 other Keepalived_vrrp[3897]: VRRP_Script(chk_haproxy) succeeded
Jul 09 02:54:18 other Keepalived_vrrp[3897]: VRRP_Instance(VI_1) Transition to MASTER STATE
Jul 09 02:54:18 other Keepalived_vrrp[3897]: VRRP_Instance(VI_1) Received higher prio advert
Jul 09 02:54:18 other Keepalived_vrrp[3897]: VRRP_Instance(VI_1) Entering BACKUP STATE
[root@other keepalived]#

停止主节点的keepalived查看我们的虚拟ip是否漂移到了从节点

posted @ 2020-07-09 14:58 天宇轩-王阅读(323) 评论(0) 编辑收藏举报

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KeepAlived 搭建高可用的HAProxy集群

KeepAlived 搭建高可用的HAProxy集群

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