Keepalived : Monitor processes2023/08/25 |
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Monitoring processes with Keepalived. This example is based on the environment like follows.
VIP:10.0.0.30
+----------------------+ | +----------------------+
| [node01.srv.world] |10.0.0.51 | 10.0.0.52| [node02.srv.world] |
| Keepalived#1 +----------+----------+ Keepalived#2 |
| | | |
+----------------------+ +----------------------+
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| [1] | |
| [2] | For example, in addition to basic Keepalived settings, add settings to monitor sshd process. |
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root@node01:~#
vi /etc/keepalived/keepalived.conf
global_defs {
router_id node01
notification_email {
root@localhost
}
notification_email_from root@node01.srv.world
smtp_server localhost
smtp_connect_timeout 30
}
# add monitoring setting for sshd process
vrrp_track_process track_sshd {
process sshd
delay 1
}
vrrp_instance VRRP1 {
state MASTER
# nopreempt
interface enp1s0
virtual_router_id 101
priority 200
advert_int 1
virtual_ipaddress {
10.0.0.30/24
}
# add
track_process {
track_sshd
}
smtp_alert
}
root@node01:~# systemctl restart keepalived
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| [3] | That's OK. Verify failover and failback when sshd would be down. |
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# primary node root@node01:~# ip address show enp1s0
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:5b:6d:b6 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.51/24 brd 10.0.0.255 scope global enp1s0
valid_lft forever preferred_lft forever
inet 10.0.0.30/24 scope global secondary enp1s0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe5b:6db6/64 scope link
valid_lft forever preferred_lft forever
root@node01:~# systemctl stop sshd root@node01:~# ip address show enp1s0
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:5b:6d:b6 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.51/24 brd 10.0.0.255 scope global enp1s0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe5b:6db6/64 scope link
valid_lft forever preferred_lft forever
root@node01:~# ssh debian@node02 "ip address show enp1s0"
debian@node02's password:
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:17:b6:c0 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.52/24 brd 10.0.0.255 scope global enp1s0
valid_lft forever preferred_lft forever
inet 10.0.0.30/24 scope global secondary enp1s0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe17:b6c0/64 scope link
valid_lft forever preferred_lft forever
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