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环境:centos7
node1:192.168.183.175
node2:192.168.183.176
前提:
1.node1与node2关闭selinux
2.node1与node2关闭firewall
3.node1和node2通过hosts互相解析对方IP
4.node1与node2可以互相通信(互相添加公钥)
5.配置好yum源
6.时间同步
一、安装keepalived
[root@node1 ~]# yum install -y keepalived
[root@node1 ~]# ssh node2 "yum install -y keepalived"
二、修改配置文件
node1
[root@node1 keepalived]# cat keepalived.conf | grep -v "#"
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from kaadmin@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass reJggig
}
virtual_ipaddress {
192.168.183.177
}
}
node2
[root@node2 keepalived]# cat keepalived.conf | grep -v "#"
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from kaadmin@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node2
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass reJggig
}
virtual_ipaddress {
192.168.183.177
}
}
三、启动keepalived
[root@node1 keepalived]# systemctl start keepalived.service
[root@node1 keepalived]# ssh node2 'systemctl start keepalived.service'
四、查看node1与node2的keepalived状态
[root@node1 keepalived]# systemctl status keepalived.service
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since 六 2018-11-17 15:01:08 CST; 2min 34s ago
Process: 10708 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 10709 (keepalived)
CGroup: /system.slice/keepalived.service
├─10709 /usr/sbin/keepalived -D
├─10710 /usr/sbin/keepalived -D
└─10711 /usr/sbin/keepalived -D
11月 17 15:01:10 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:10 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:10 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:10 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on ens33 for 192.168.183.177
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
[root@node1 keepalived]# ssh node2 'systemctl status keepalived.service'
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since 六 2018-11-17 15:01:40 CST; 2min 6s ago
Process: 10648 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 10649 (keepalived)
CGroup: /system.slice/keepalived.service
├─10649 /usr/sbin/keepalived -D
├─10650 /usr/sbin/keepalived -D
└─10651 /usr/sbin/keepalived -D
11月 17 15:01:40 node2 Keepalived_healthcheckers[10650]: Initializing ipvs
11月 17 15:01:40 node2 Keepalived_vrrp[10651]: Registering Kernel netlink reflector
11月 17 15:01:40 node2 Keepalived_vrrp[10651]: Registering Kernel netlink command channel
11月 17 15:01:40 node2 Keepalived_vrrp[10651]: Registering gratuitous ARP shared channel
11月 17 15:01:40 node2 Keepalived_vrrp[10651]: Opening file '/etc/keepalived/keepalived.conf'.
11月 17 15:01:40 node2 Keepalived_vrrp[10651]: VRRP_Instance(VI_1) removing protocol VIPs.
11月 17 15:01:40 node2 Keepalived_vrrp[10651]: Using LinkWatch kernel netlink reflector...
11月 17 15:01:40 node2 Keepalived_vrrp[10651]: VRRP_Instance(VI_1) Entering BACKUP STATE
11月 17 15:01:40 node2 Keepalived_vrrp[10651]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]
11月 17 15:01:40 node2 Keepalived_healthcheckers[10650]: Opening file '/etc/keepalived/keepalived.conf'.
[root@node1 keepalived]#
五、查看node1和node2的IP情况
[root@node1 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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:7d:cb:f8 brd ff:ff:ff:ff:ff:ff
inet 192.168.183.175/24 brd 192.168.183.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 192.168.183.177/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe7d:cbf8/64 scope link
valid_lft forever preferred_lft forever
[root@node1 keepalived]# ssh node2 '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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:fb:3b:50 brd ff:ff:ff:ff:ff:ff
inet 192.168.183.176/24 brd 192.168.183.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fefb:3b50/64 scope link
valid_lft forever preferred_lft forever
[root@node1 keepalived]#
可以看到,VIP现在在node1上
六、手动停掉node1的keepalived服务
[root@node1 keepalived]# systemctl stop keepalived.service
[root@node1 keepalived]# systemctl status keepalived.service
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: inactive (dead)
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on ens33 for 192.168.183.177
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:01:15 node1 Keepalived_vrrp[10711]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:09:10 node1 Keepalived[10709]: Stopping
11月 17 15:09:10 node1 systemd[1]: Stopping LVS and VRRP High Availability Monitor...
11月 17 15:09:10 node1 Keepalived_vrrp[10711]: VRRP_Instance(VI_1) sent 0 priority
11月 17 15:09:10 node1 Keepalived_vrrp[10711]: VRRP_Instance(VI_1) removing protocol VIPs.
11月 17 15:09:11 node1 systemd[1]: Stopped LVS and VRRP High Availability Monitor.
七、观察node1与node2的IP情况
可以看到,VIP已经跑到node2上了
[root@node1 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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:7d:cb:f8 brd ff:ff:ff:ff:ff:ff
inet 192.168.183.175/24 brd 192.168.183.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe7d:cbf8/64 scope link
valid_lft forever preferred_lft forever
[root@node1 keepalived]# ssh node2 '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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:fb:3b:50 brd ff:ff:ff:ff:ff:ff
inet 192.168.183.176/24 brd 192.168.183.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 192.168.183.177/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fefb:3b50/64 scope link
valid_lft forever preferred_lft forever
八、重新启动node1的keepalived
[root@node1 keepalived]# systemctl start keepalived.service
[root@node1 keepalived]# systemctl status keepalived.service
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since 六 2018-11-17 15:15:59 CST; 7s ago
Process: 10780 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 10781 (keepalived)
CGroup: /system.slice/keepalived.service
├─10781 /usr/sbin/keepalived -D
├─10782 /usr/sbin/keepalived -D
└─10783 /usr/sbin/keepalived -D
11月 17 15:16:01 node1 Keepalived_vrrp[10783]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:16:01 node1 Keepalived_vrrp[10783]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:16:01 node1 Keepalived_vrrp[10783]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:16:01 node1 Keepalived_vrrp[10783]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:16:06 node1 Keepalived_vrrp[10783]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:16:06 node1 Keepalived_vrrp[10783]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on ens33 for 192.168.183.177
11月 17 15:16:06 node1 Keepalived_vrrp[10783]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:16:06 node1 Keepalived_vrrp[10783]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:16:06 node1 Keepalived_vrrp[10783]: Sending gratuitous ARP on ens33 for 192.168.183.177
11月 17 15:16:06 node1 Keepalived_vrrp[10783]: Sending gratuitous ARP on ens33 for 192.168.183.177
九、查看node1与node2的IP
发现VIP又回到了node1
keepalived默认为抢占模式,当node1的keepalived恢复时,VIP又会被抢回node1
只有加了vrrp实例中加了nopreempt这一条,VIP才不会抢回去
[root@node1 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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:7d:cb:f8 brd ff:ff:ff:ff:ff:ff
inet 192.168.183.175/24 brd 192.168.183.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 192.168.183.177/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe7d:cbf8/64 scope link
valid_lft forever preferred_lft forever
[root@node1 keepalived]# ssh node2 '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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:fb:3b:50 brd ff:ff:ff:ff:ff:ff
inet 192.168.183.176/24 brd 192.168.183.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fefb:3b50/64 scope link
valid_lft forever preferred_lft forever