I've been using Keepalived for over a decade and in most setups with so-called track_scripts. This has always worked very well and helped to detect application issues and therefore trigger an automatic failover.
On a new Debian 12 (Bookworm) setup I ran into a problem though, once the Keepalived config (/etc/keepalived/keepalived.conf) was reloaded:
2024-07-24T06:43:29.025785+02:00 debian Keepalived_vrrp[769590]: (/etc/keepalived/keepalived.conf: Line 61) (vipgw) track script chk_nginx_curl not found, ignoring...
2024-07-24T06:43:29.025850+02:00 debian Keepalived_vrrp[769590]: (/etc/keepalived/keepalived.conf: Line 62) (vipgw) track script chk_failover_trigger not found, ignoring...
2024-07-24T06:43:29.025923+02:00 debian Keepalived_vrrp[769590]: Warning - script chk_failover_trigger is not used
2024-07-24T06:43:29.026011+02:00 debian Keepalived_vrrp[769590]: Warning - script chk_nginx_curl is not used
At first I expected a problem with the Keepalived script_user, but that wasn't the case. Then I stumbled on a GitHub issue which mentioned that a vrrp_script is ignored without specifying a script user. But having defined a script_user already, I could rule this out, too.
Looking at configurations from previous setups showed that I've always used the following order in the config file in the past:
global defs { }
vrrp_script { }
vrrp_instance { }
But on the new Debian 12 setup I've defined the vrrp_script entries at the bottom:
global defs { }
vrrp_instance { }
vrrp_script { }
Could it be, that Keepalived parses the config from top to bottom and therefore can't find the vrrp_script references inside the vrrp_instance's track_script { } context?
As it turns out: yes!
Once the order in the config file was changed and the vrrp_script entries were defined before the vrrp_instance entries, Keepalived loaded the scripts correctly and started executing them at the defined intervals.
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