Keepalived : Set notification script2024/07/23 |
To set notification script, it's possible to execute any script when the state of Keepalived changes. 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 | | | | | +----------------------+ +----------------------+ |
[1] | |
[2] | For example, in addition to basic Keepalived settings, set notification script. |
# create new #!/bin/bash TYPE=$1 NAME=$2 ENDSTATE=$3 MASTER_STATE () { # write any action here when Keepalived enters MASTER state /usr/bin/echo "MASTER state for VRRP ${TYPE} ${NAME}" > /tmp/keepalive.stat } BACKUP_STATE () { # write any action here when Keepalived enters BACKUP state /usr/bin/echo "BACKUP state for VRRP ${TYPE} ${NAME}" > /tmp/keepalive.stat } FAULT_STATE () { # write any action here when Keepalived enters FAULT state /usr/bin/echo "FAULT state for VRRP ${TYPE} ${NAME}" > /tmp/keepalive.stat } case $ENDSTATE in "MASTER") MASTER_STATE exit 0 ;; "BACKUP") BACKUP_STATE exit 0 ;; "FAULT") FAULT_STATE exit 0 ;; *) echo "${ENDSTATE} is unknown state for VRRP ${TYPE} ${NAME}" exit 1 ;; esac
root@node01:~#
chmod 755 /etc/keepalived/notify.sh
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 enable_script_security # specify a user who runs script # for security reasons, it should not use root script_user root } vrrp_instance VRRP1 { state BACKUP nopreempt interface enp1s0 virtual_router_id 101 priority 200 advert_int 1 virtual_ipaddress { 10.0.0.30/24 } smtp_alert # add # impossible to specify argument to scripts for [notify] section # for [notify], some arguments are added automatically like follows # notify script.sh (INSTANCE|GROUP) (instance name) (ENDSTATE) (priority) notify /etc/keepalived/notify.sh # also possible to specify like follows # possible to specify arguments here # notify_master "script.sh arg1 arg2 ..." # notify_backup "script.sh arg1 arg2 ..." # notify_fault "script.sh arg1 arg2 ..." }root@node01:~# systemctl restart keepalived
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[3] | That's OK. Verify actions for notification script when the state of Keepalived would be changed. |
root@node01:~#
root@node01:~# systemctl restart keepalived
cat /tmp/keepalive.stat BACKUP state for VRRP INSTANCE VRRP1 |
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