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[Paride Legovini <1795420@xxxxxxxxxxxxxxxxxx>]

This specific issue (the FATAL error) is fixed on >= Bionic and
therefore I'm marking the Bionic task as Fix Released.

However the

  script "</dev/tcp/127.0.0.1/53"

syntax doesn't currently work on any supported version of Ubuntu, but
for a different reason: it relies on /bin/sh being Bash. I filed a
separate LP bug for this problem with more details:

  https://bugs.launchpad.net/ubuntu/+source/keepalived/+bug/1934300

however for the moment my suggestion is to use alternative ways to check
if a TCP port is open, e.g. something like:

    script "bash -c '</dev/tcp/127.0.0.1/80'"
    script "nc -z 127.0.0.1 80"

** Changed in: keepalived (Ubuntu Bionic)
       Status: Incomplete => Fix Released

** Changed in: keepalived (Ubuntu Bionic)
     Assignee: Paride Legovini (paride) => (unassigned)

** Tags removed: server-next

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https://bugs.launchpad.net/bugs/1795420

Title:
  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:
  Won't Fix
Status in keepalived source package in Bionic:
  Fix Released
Status in keepalived source package in Cosmic:
  Won't Fix

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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