First, the environment
Nx1 192.168.40.211
nginx2 192.168.40.132
vip1 192.168.40.223 Lord keep1, is from keep2
vip2 192.168.40.222 Lord keep2, is from keep1
(Here, the installation mode yum are employed, is not tired)
Two, keepalived profile
Nx1
we /etc/keepalived/keepalived.conf
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
route_id LVS_DEVEL
}
vrrp_script_chk_nginx {
script "/etc/keepalived/ck_ng.sh"
interval 2
weight 2
}
# VIP1
vrrp_instance VI_1 {
state MASTER
interface ens33
lvs_sync_daemon_interface ens33
virtual_router_id 151
priority 100
advert_int 5
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.40.223
}
track_script {
chk_nginx
}
}
#VIP2
vrrp_instance VI_2 {
state BACKUP
interface ens33
lvs_sync_daemon_interface ens33
virtual_router_id 152
priority 90
advert_int 5
nopreempt
authentication {
auth_type PASS
auth_pass 2222
}
virtual_ipaddress {
192.168.40.222
}
track_script {
chk_nginx
}
}
nginx2
#vi /etc/keepalived/keepalived.conf
global_defs {
notification_email {
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
route_id LVS_DEVEL
}
vrrp_script_chk_nginx {
script "/etc/keepalived/ck_ng.sh"
interval 2
weight 2
}
# VIP1
vrrp_instance VI_1 {
state BACKUP
interface ens33
lvs_sync_daemon_interface ens33
virtual_router_id 151
priority 90
advert_int 5
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.40.223
}
track_script {
chk_nginx
}
}
#VIP2
vrrp_instance VI_2 {
state MASTER
interface ens33
lvs_sync_daemon_interface ens33
virtual_router_id 152
priority 100
advert_int 5
nopreempt
authentication {
auth_type PASS
auth_pass 2222
}
virtual_ipaddress {
192.168.40.222
}
track_script {
chk_nginx
}
}
Three, nginx detection script (two loom as)
#vi /etc/keepalived/ck_ng.sh
#!/bin/bash
# Check nginx process exists
counter=$(ps -C nginx --no-heading|wc -l)
if [ "${counter}" = "0" ]; then
# After trying to start a nginx, stopping five seconds is detected again
service nginx start
sleep 5
counter=$(ps -C nginx --no-heading|wc -l)
if [ "${counter}" = "0" ]; then
# If the startup is not successful, kill keepalive trigger switchover
service keepalived stop
be
be
#chmod +x /etc/keepalived/ck_ng.sh
Fourth, the test
[root@localhost ~]# ip a （nginx1）
....
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:17:c0:db brd ff:ff:ff:ff:ff:ff
inet 192.168.40.211/24 brd 192.168.40.255 scope global ens33
valid_lft forever preferred_lft forever
inet 192.168.40.223/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe17:c0db/64 scope link
valid_lft forever preferred_lft forever
[root@localhost ~]# ip a (nginx2)
....
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link / ether 00: 0C: 29: 5e: ba: a3 brd ff: ff: ff: ff: ff: ff
inet 192.168.40.132/24 brd 192.168.40.255 scope global ens33
valid_lft forever preferred_lft forever
inet 192.168.40.222/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe5e:baa3/64 scope link
valid_lft forever preferred_lft forever
The stopped nginx1 keepalived, nginx1 at this time is transferred to the vip nginx2, as follows
[root@localhost ~]# ip a
....
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link / ether 00: 0C: 29: 5e: ba: a3 brd ff: ff: ff: ff: ff: ff
inet 192.168.40.132/24 brd 192.168.40.255 scope global ens33
valid_lft forever preferred_lft forever
inet 192.168.40.222/32 scope global ens33
valid_lft forever preferred_lft forever
inet 192.168.40.223/32 scope global ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe5e:baa3/64 scope link
valid_lft forever preferred_lft forever
Two virtual IP to go on one of these machines were successfully