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Message #33657
[Bug 1795420] Re: [SRU] Keepalived update from 1.2.19 to 1.2.24 breaks support for /dev/tcp health check
Cosmic is out of service, so canceling that task. The bug is otherwise
still valid for sru for xenial/bionic if/when someone has time to
package it and finish the SRU form. Meanwhile, if anyone is interested
in helping push this issue towards a fix, the SRU process is documented
at https://wiki.ubuntu.com/StableReleaseUpdates.
** Changed in: keepalived (Ubuntu Cosmic)
Status: Triaged => Invalid
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https://bugs.launchpad.net/bugs/1795420
Title:
[SRU] Keepalived update from 1.2.19 to 1.2.24 breaks support for
/dev/tcp health check
Status in keepalived package in Ubuntu:
Fix Released
Status in keepalived source package in Xenial:
Triaged
Status in keepalived source package in Bionic:
Triaged
Status in keepalived source package in Cosmic:
Invalid
Bug description:
Previous configuration that works fine:
vrrp_script chk_trigger_port {
script "</dev/tcp/127.0.0.1/53"
interval 5
weight 30
}
This syntax is documented all over, and worked properly in 1.2.19, but
update to 1.2.24 package broke it.
Resulting symptom is that keepalived will continuously fail with a
FATAL error and respawn, and will not ever come online fully.
Tracing the service, it is getting a no such file or directory on the
/dev/tcp script. I have not looked at the code changes, but I suspect
there was some optimization to not use bash, or change in how the
script is executed - breaking support for that syntax.
I was able to work around with:
script "/bin/bash -c '</dev/tcp/127.0.0.1/53'"
but that still leaves all of the incorrect documentation.
Looks like it may have already been corrected upstream - please
backport this fix to ubuntu 16.04 package train please:
https://github.com/acassen/keepalived/commit/5cd5fff78de11178c51ca245ff5de61a86b85049
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