Public bug reported:
1) The release of Ubuntu we are using
$ lsb_release -rd
Description: Ubuntu 16.04.5 LTS
Release: 16.04
2) The version of the package we are using
$ apt-cache policy keepalived
keepalived:
Installed: 1:1.2.24-1ubuntu0.16.04.1
...
3) What we expected to happen
MISC healthcheckers would be treated normally.
4) What happened instead
We are trying to use Ubuntu 16.04's keepalived with our own MISC healthchecker,
which is implemented to exit with exit code 3, and getting the following log
messages endlessly.
--- Note: some IP fields are masked ---
Sep 12 06:55:09 devsvr Keepalived[16705]: Healthcheck child process(34232)
died: Respawning
Sep 12 06:55:09 devsvr Keepalived[16705]: Starting Healthcheck child process,
pid=34239
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Initializing ipvs
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Registering Kernel
netlink reflector
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Registering Kernel
netlink command channel
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Opening file
'/etc/keepalived/keepalived.conf'.
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Using LinkWatch kernel
netlink reflector...
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Activating
healthchecker for service [XX.XX.XX.18]:80
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Activating
healthchecker for service [XX.XX.XX.19]:80
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Activating
healthchecker for service [XX.XX.XX.18]:443
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Activating
healthchecker for service [XX.XX.XX.19]:443
...
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Activating
healthchecker for service [XX.XX.XX.52]:443
Sep 12 06:55:09 devsvr Keepalived_healthcheckers[34239]: Activating
healthchecker for service [XX.XX.XX.53]:443
Sep 12 06:55:10 devsvr Keepalived_healthcheckers[34239]: pid 34257 exited with
permanent error CONFIG. Terminating
Sep 12 06:55:10 devsvr Keepalived_healthcheckers[34239]: Removing service
[XX.XX.XX.24]:25 from VS [YY.YY.YY.YY]:0
Sep 12 06:55:10 devsvr Keepalived_healthcheckers[34239]: Removing service
[XX.XX.XX.25]:25 from VS [YY.YY.YY.YY]:0
Sep 12 06:55:10 devsvr Keepalived_healthcheckers[34239]: Removing service
[XX.XX.XX.21]:56667 from VS [ZZ.ZZ.ZZ.ZZ]:0
Sep 12 06:55:10 devsvr Keepalived_healthcheckers[34239]: Removing service
[XX.XX.XX.52]:443 from VS [WW.WW.WW.WW]:0
Sep 12 06:55:10 devsvr Keepalived[16705]: Healthcheck child process(34239)
died: Respawning
Sep 12 06:55:10 devsvr Keepalived[16705]: Starting Healthcheck child process,
pid=34260
...
---
It looks like our MISC healthchecker's exit code 3, which should be a
valid value according to the following description, is treated as a
permanent error since it is equal to KEEPALIVED_EXIT_CONFIG defined in
keepalived's lib/scheduler.h :
---
# MISC healthchecker, run a program
MISC_CHECK
{
# External script or program
...
# exit status 2-255: svc check success, weight
# changed to 2 less than exit status.
# (for example: exit status of 255 would set
# weight to 253)
misc_dynamic
}
---
The problem, we think, have started with this patch (we did not see the problem
in Ubuntu 14.04):
Stop respawning children repeatedly after permanent error
-
https://github.com/acassen/keepalived/commit/4ae9314af448eb8ea4f3d8ef39bcc469779b0fec
The problem will be fixed by this patch (not included in Ubuntu 16.04):
Make report_child_status() check for vrrp and checker child processes
-
https://github.com/acassen/keepalived/commit/ca955a7c1a6af324428ff04e24be68a180be127f
Please consider backporting it to Ubuntu 16.04's keepalived.
** Affects: keepalived (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1792298
Title:
keepalived: MISC healthchecker's exit status is erroneously treated as
a permanent error
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