Keepalived是一款双机热备(HA)的软件,经常与haproxy结合使用,进行热备+负载均衡,实现高可用。
1. 实验环境主人:10.20.2.233
备份:10.20.2.235
虚拟IP:10.20.2.238
2. Keepalived安装1)通过yum安装软件依赖包
yum install -y wget make gcc openssl-devel popt-devel2)下载并安装Keepalived源代码包
下载地址:http://www.keepalived.org/software/keepalived-1.2.23.tar.gz
tar -zxf keepalived-1.2.23.tar.gz -C /usr/src cd /sru/src/keepalived-1.2.23/ ./configure --prefix=/usr/local/keepalived/ Make make install3)安装成功后,使其进入服务模式。
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/ cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ 3. 编辑配置文件 mkdir -p /etc/keepalived cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/1)主配置文件的内容如下:
! Configuration File for keepalived global_defs { router_id HA_TEST } #监测haproxy进程状态,每2秒执行一次 vrrp_script chk_haproxy { script "/etc/keepalived/check_haproxy.sh" interval 2 weight 2 } vrrp_instance VI_1 { state MASTER # 从为BACKUP priority 200 # 从为100 virtual_router_id 51 #路由ID,可通过#tcpdump vrrp查看。 garp_master_delay 1 #主从切换时间,单位为秒。 interface eth0 advert_int 1 mcast_src_ip 10.20.2.233 #MASTER服务器IP,从服务器写从服务器的IP authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.20.2.238 #虚拟IP } track_script { chk_haproxy #监测haproxy进程状态 } }2)备份配置文件的内容如下:
! Configuration File for keepalived global_defs { router_id HA_TEST } #监测haproxy进程状态,每2秒执行一次 vrrp_script chk_haproxy { script "/etc/keepalived/check_haproxy.sh" interval 2 weight 2 } vrrp_instance VI_1 { state BACKUP # 主为MASTER priority 100 # 主为101 virtual_router_id 51 #路由ID,可通过#tcpdump vrrp查看。 garp_master_delay 1 #主从切换时间,单位为秒。 interface eth0 advert_int 1 mcast_src_ip 10.20.2.235 #BACKUP服务器IP,主服务器写主服务器的IP authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.20.2.238 #虚拟IP } track_script { chk_haproxy #监测haproxy进程状态 } }haproxy检测脚本(check_haproxy.sh)的内容如下
#!/bin/bash A=`ps -C haproxy --no-header |wc -l` if [ $A -eq 0 ];then /etc/init.d/haproxyd start sleep 3 if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then /etc/init.d/keepalived stop fi Fi chmod 755 /etc/keepalived/check_haproxy.sh #脚本编写完成后需要赋上权限4)保持激活的开始和停止
service keepalived start #停止 service keepalived stop #启动 service keepalived restart #重启 4. 测试:1)在主服务器和备份服务器上启动keepalived。
service keepalived start (keepalived启动的同时会将haproxy启动) [root@test keepalived]# service keepalived start Starting keepalived: [ OK ] [root@test keepalived]# service haproxyd status HAProxy(pid 32077) is running!主用绑定VIP,备用不绑定VIP。
[root@test keepalived]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:50:56:85:46:b2 brd ff:ff:ff:ff:ff:ff inet 10.20.2.233/24 brd 10.20.2.255 scope global eth0 inet 10.20.2.238/32 scope global eth0 inet6 fe80::250:56ff:fe85:46b2/64 scope link valid_lft forever preferred_lft forever [root@dengqp01 keepalived]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:50:56:85:73:ce brd ff:ff:ff:ff:ff:ff inet 10.20.2.235/24 brd 10.20.2.255 scope global eth0 inet6 fe80::250:56ff:fe85:73ce/64 scope link valid_lft forever preferred_lft forever2)停止主机上的haproxy。3秒钟后,keepalived将启动它。
[root@test keepalived]# service haproxyd stop STOP HAProxy Listen STOP HAProxy process [root@test keepalived]# service haproxyd status HAProxy(pid 32368) is running!3)停止主服务器上的keepalived,备用服务器将立即接管服务。
一个VIP必然要备份。
[root@dengqp01 keepalived]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:50:56:85:73:ce brd ff:ff:ff:ff:ff:ff inet 10.20.2.235/24 brd 10.20.2.255 scope global eth0 inet 10.20.2.238/32 scope global eth0 inet6 fe80::250:56ff:fe85:73ce/64 scope link valid_lft forever preferred_lft forever4)在主服务器上启动keepalived,主服务器绑定VIP,备份服务器释放VIP。
[root@test keepalived]# service keepalived start Starting keepalived: [ OK ] [root@dengqp01 keepalived]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:50:56:85:73:ce brd ff:ff:ff:ff:ff:ff inet 10.20.2.235/24 brd 10.20.2.255 scope global eth0 inet 10.20.2.238/32 scope global eth0 inet6 fe80::250:56ff:fe85:73ce/64 scope link valid_lft forever preferred_lft forever欢迎分享,转载请注明来源:内存溢出
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