1.环境两台Centos服务器
IP1:192.168.1.78
IP2:192.168.1.79
VIP:192.168.1.88
2.安装keeplived软件和nginx
每台服务器上都要安装keeplived和nginx
- nginx安装省略
- keepalived安装
tar -xvf keepalived-1.3.5.tar.gz
cd keepalived-1.3.5
./configure
make && make install
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig
mkdir /etc/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin
- 配置keepalived
主节点,修改keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
#acassen@firewall.loc
#failover@firewall.loc
#sysadmin@firewall.loc
}
#notification_email_from Alexandre.Cassen@firewall.loc
#smtp_server 192.168.200.1
#smtp_connect_timeout 30
router_id master-node
#vrrp_skip_check_adv_addr
#vrrp_strict
#vrrp_garp_interval 0
#vrrp_gna_interval 0
}
vrrp_instance VI_1 {
state MASTER
interface ens33
mcast_src_ip 192.168.1.78
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.88
}
}
从节点,修改keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
#acassen@firewall.loc
#failover@firewall.loc
#sysadmin@firewall.loc
}
#notification_email_from Alexandre.Cassen@firewall.loc
#smtp_server 192.168.200.1
#smtp_connect_timeout 30
router_id master-node
#vrrp_skip_check_adv_addr
#vrrp_strict
#vrrp_garp_interval 0
#vrrp_gna_interval 0
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
mcast_src_ip 192.168.1.79
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.88
}
}
2.测试
一、测试vip绑定、漂移
启动两个节点上的keepalived服务,使用ip a命令查看vip在哪个节点上。
Master:
~ [root@hrsw etc]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:6c:b0:3a brd ff:ff:ff:ff:ff:ff inet 192.168.1.78/24 brd 192.168.1.255 scope global ens33 valid_lft forever preferred_lft forever inet 192.168.1.88/32 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::5b7e:1a3d:618d:1e93/64 scope link valid_lft forever preferred_lft forever 3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:6c:b0:44 brd ff:ff:ff:ff:ff:ff inet 192.168.1.40/24 brd 192.168.1.255 scope global dynamic ens37 valid_lft 540sec preferred_lft 540sec inet6 fe80::9f21:50a8:7aa9:759b/64 scope link valid_lft forever preferred_lft forever
Backup:
[root@hrsw sysconfig]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:b0:0f:fd brd ff:ff:ff:ff:ff:ff inet 192.168.1.79/24 brd 192.168.1.255 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::5e88:7cdb:644:41e/64 scope link valid_lft forever preferred_lft forever inet6 fe80::5b7e:1a3d:618d:1e93/64 scope link tentative dadfailed valid_lft forever preferred_lft forever 3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:b0:0f:07 brd ff:ff:ff:ff:ff:ff inet 192.168.1.41/24 brd 192.168.1.255 scope global dynamic ens37 valid_lft 539sec preferred_lft 539sec inet6 fe80::2b81:1f13:5102:80ef/64 scope link valid_lft forever preferred_lft forever
可以看出VIP在master节点,现在将Master节点的keepalived服务停掉,或直接把Master节点服务器关机,再次查看
Master:
[root@hrsw etc]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:6c:b0:3a brd ff:ff:ff:ff:ff:ff inet 192.168.1.78/24 brd 192.168.1.255 scope global ens33 valid_lft forever preferred_lft forever inet 192.168.1.88/32 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::5b7e:1a3d:618d:1e93/64 scope link valid_lft forever preferred_lft forever 3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:6c:b0:44 brd ff:ff:ff:ff:ff:ff inet 192.168.1.40/24 brd 192.168.1.255 scope global dynamic ens37 valid_lft 366sec preferred_lft 366sec inet6 fe80::9f21:50a8:7aa9:759b/64 scope link valid_lft forever preferred_lft forever
Backup:
[root@hrsw sysconfig]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:b0:0f:fd brd ff:ff:ff:ff:ff:ff inet 192.168.1.79/24 brd 192.168.1.255 scope global ens33 valid_lft forever preferred_lft forever inet 192.168.1.88/32 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::5e88:7cdb:644:41e/64 scope link valid_lft forever preferred_lft forever inet6 fe80::5b7e:1a3d:618d:1e93/64 scope link tentative dadfailed valid_lft forever preferred_lft forever 3: ens37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:b0:0f:07 brd ff:ff:ff:ff:ff:ff inet 192.168.1.41/24 brd 192.168.1.255 scope global dynamic ens37 valid_lft 380sec preferred_lft 380sec inet6 fe80::2b81:1f13:5102:80ef/64 scope link valid_lft forever preferred_lft forever
可以看出VIP已经漂移到Backup节点上。查看Backup日志,显示切换到了MASTER STATE
Jun 8 09:56:24 hrsw Keepalived_vrrp[2427]: VRRP_Instance(VI_1) Transition to MASTER STATE Jun 8 09:56:25 hrsw Keepalived_vrrp[2427]: VRRP_Instance(VI_1) Entering MASTER STATE Jun 8 09:56:25 hrsw Keepalived_vrrp[2427]: VRRP_Instance(VI_1) setting protocol VIPs.
再次启动Master节点上的keepalived服务,查看Backup日志,显示切换回了BACKUP STATE
Jun 8 09:54:56 hrsw dhclient[680]: bound to 192.168.1.41 -- renewal in 249 seconds. Jun 8 09:54:56 hrsw dbus[615]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher' Jun 8 09:54:56 hrsw dbus-daemon: dbus[615]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher' Jun 8 09:54:56 hrsw systemd: Started Network Manager Script Dispatcher Service. Jun 8 09:54:56 hrsw nm-dispatcher: req:1 'dhcp4-change' [ens37]: new request (3 scripts) Jun 8 09:54:56 hrsw nm-dispatcher: req:1 'dhcp4-change' [ens37]: start running ordered scripts... Jun 8 09:55:44 hrsw Keepalived_vrrp[2427]: VRRP_Instance(VI_1) Received advert with higher priority 100, ours 99 Jun 8 09:55:44 hrsw Keepalived_vrrp[2427]: VRRP_Instance(VI_1) Entering BACKUP STATE Jun 8 09:55:44 hrsw Keepalived_vrrp[2427]: VRRP_Instance(VI_1) removing protocol VIPs.
二、测试访问
两个节点keepalived和nginx都正常情况下:
关闭Masterkeepalived服务
开启Masterkeepalived服务,关闭nginx服务
发现这个时候就访问不到了,原因是Master keepalived服务是正常的,所以访问1.88的时候还是去访问了Master上的nginx,但是现在nginx已经停止了,所以访问不到了。
我们要达到的效果是nginx停了,VIP也要随之切换。怎么办呢?让keepalived监控nginx的健康状况,如果nginx异常,就停止该keepalived服务。
修改keepalived.conf,增加如下代码
vrrp_script chk_nginx { script "/etc/keepalived/check_nginx.sh" interval 2 weight 2 } track_script { chk_nginx }
#!/bin/bash counter=`ps -ef|grep nginx|grep -v "grep"|wc -l` if [ $counter -eq 0 ]; then /mnt/Disk/nginx2/sbin/nginx sleep 2 counter=`ps -ef|grep nginx|grep -v "grep"|wc -l` if [ $counter -eq 0 ]; then pkill -9 keepalived fi fi
来源:https://www.cnblogs.com/czrwxw/p/6957445.html