[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Brian Murray]

Hello Peter, or anyone else affected,

Accepted haproxy into vivid-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/haproxy/1.5.10-1ubuntu0.2 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: haproxy (Ubuntu Vivid)
   Status: In Progress => Fix Committed

** Tags removed: verification-done

** Tags added: verification-needed

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Launchpad Bug Tracker]

This bug was fixed in the package haproxy - 1.4.24-2ubuntu0.3

---
haproxy (1.4.24-2ubuntu0.3) trusty; urgency=medium

  * debian/haproxy.init:
- Loops through all PIDs present in the PIDFILE when
  nproc > 1 (LP: #1481737)

 -- Louis Bouchard   Wed, 23 Sep 2015
17:45:41 +0200

** Changed in: haproxy (Ubuntu Trusty)
   Status: Fix Committed => Fix Released

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Chris J Arges]

Sponsored for vivid

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Louis Bouchard]

ok, I'm on the vivid SRU

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Louis Bouchard]

** Tags removed: verification-needed
** Tags added: verification-done

** Changed in: haproxy (Ubuntu Trusty)
 Assignee: Louis Bouchard (louis-bouchard) => (unassigned)

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Louis Bouchard]

debdiff for vivid SRU

** Patch added: "lp1481737_vivid.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/haproxy/+bug/1481737/+attachment/4531521/+files/lp1481737_vivid.debdiff

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Chris J Arges]

Can someone post an SRU for vivid? Thanks

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Chris J Arges]

Hello Peter, or anyone else affected,

Accepted haproxy into trusty-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/haproxy/1.4.24-2ubuntu0.3 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: haproxy (Ubuntu Trusty)
   Status: In Progress => Fix Committed

** Tags removed: verification-done

** Tags added: verification-needed

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Launchpad Bug Tracker]

This bug was fixed in the package haproxy - 1.5.14-1ubuntu0.15.10.1

---
haproxy (1.5.14-1ubuntu0.15.10.1) wily; urgency=medium

  * Ensure that haproxy processes are terminated correctly when executing
stop/restart operations, easing backports to pre-systemd versions of
Ubuntu (LP: #1477198, #1481737).

 -- James Page   Mon, 09 Nov 2015 16:51:46 +

** Changed in: haproxy (Ubuntu Wily)
   Status: Fix Committed => Fix Released

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[James Page]

** Tags removed: verification-needed
** Tags added: verification-done

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[James Page]

** Also affects: haproxy (Ubuntu Wily)
   Importance: Undecided
   Status: New

** Also affects: haproxy (Ubuntu Xenial)
   Importance: Medium
   Status: Fix Released

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[James Page]

Please can we ensure that this is actually fixed in the current
development release as well; we're backporting haproxy to 14.04 as part
of the Ubuntu Cloud Archive, so having backwards compat in the latest
packages with 14.04 is important.

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[James Page]

Related bug 1477198

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[James Page]

There's a small niggle in the proposed change for trusty; the 'clean'
exit handling will override the exit code from the init script,
resulting in the return code being 0 all of the time; dropping the exit
from within 'clean' will resolve this.

I've uploaded Louis' fix with this small improvement to xenial

** Changed in: haproxy (Ubuntu Xenial)
   Status: Fix Released => In Progress

** Changed in: haproxy (Ubuntu Wily)
   Importance: Undecided => Medium

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Chris J Arges]

Hello Peter, or anyone else affected,

Accepted haproxy into wily-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/haproxy/1.5.14-1ubuntu0.15.10.1 in
a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: haproxy (Ubuntu Wily)
   Status: In Progress => Fix Committed

** Tags added: verification-needed

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[James Page]

** Changed in: haproxy (Ubuntu Wily)
   Status: New => In Progress

** Changed in: haproxy (Ubuntu Xenial)
 Assignee: (unassigned) => James Page (james-page)

** Changed in: haproxy (Ubuntu Wily)
 Assignee: (unassigned) => James Page (james-page)

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Launchpad Bug Tracker]

This bug was fixed in the package haproxy - 1.6.2-2ubuntu3

---
haproxy (1.6.2-2ubuntu3) xenial; urgency=medium

  * d/haproxy.init: Ensure that cleanup does not override exit status
of init script.

 -- James Page   Mon, 09 Nov 2015 14:35:15 +

** Changed in: haproxy (Ubuntu Xenial)
   Status: In Progress => Fix Released

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Louis Bouchard]

** Also affects: haproxy (Ubuntu Vivid)
   Importance: Undecided
   Status: New

** Changed in: haproxy (Ubuntu Vivid)
 Assignee: (unassigned) => Louis Bouchard (louis-bouchard)

** Changed in: haproxy (Ubuntu Vivid)
   Importance: Undecided => Medium

** Changed in: haproxy (Ubuntu Vivid)
   Status: New => In Progress

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Mathieu Trudel-Lapierre]

sponsored.

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Mathew Hodson]

** Tags removed: haproxy
** Tags added: trusty

** Changed in: haproxy (Ubuntu)
   Status: Invalid => Fix Released

** Changed in: haproxy (Ubuntu)
   Importance: Undecided => Medium

** Tags removed: needs-upstream-report

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Louis Bouchard]

** Patch removed: "lp1494141_fix_stop_failure.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/haproxy/+bug/1481737/+attachment/4473139/+files/lp1494141_fix_stop_failure.debdiff

** Patch added: "lp1481737_stop_multipid.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/haproxy/+bug/1481737/+attachment/4492590/+files/lp1481737_stop_multipid.debdiff

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Louis Bouchard]

** Description changed:

+ [SRU justification]
+ The sysVinit script does not completely stop processes when nbproc > 1
+ 
+ [Impact]
+ Stopping haproxy without this fix leaves all but one process running
+ 
+ [Fix]
+ Use temporary pidfile in a loop containing one single PID as the --pid option 
is not available for start-stop-daemon.
+ 
+ [Test Case]
+ Set nbproc > 4 in /etc/haproxy/haproxy.cfg
+ resart haproxy & verify that there is more than one haproxy process
+ Run :
+ $ ps aux | grep haproxy | grep -v grep | wc -l
+ 4
+ $ service haproxy stop
+ $ ps aux | grep haproxy | grep -v grep | wc -l
+ 
+ Without the patch, the result of the last command will be 3. With the
+ fix, it will be 0
+ 
+ [Regression]
+ The regression risk is in the use of a temporary file instead of the 
start-stop-daemon option.
+ 
+ It has been tested with TMPDIR="/tmp/My Dir" to check for spaces in
+ directory names.
+ 
+ [Original description of the problem]
  In case you have more than one process enabled in the haproxy config, the 
init script fails to stop all of those processes.
  So to clarify you need to have this in your haproxy.cfg:
  
  """
  ...
  global
- maxconn 32000
- ulimit-n65536
- userhaproxy
- group   haproxy
- nbproc  2
+ maxconn 32000
+ ulimit-n65536
+ userhaproxy
+ group   haproxy
+ nbproc  2
  
  ...
  """
  
  the problem is more visible if you set the nbproc to higher number.
  
  service haproxy stop --> will only stop on of the haproxy processes.
  
  The problem is so that start-stop-daemon can't handle pid files with multiple 
lines. Only stopping the first one. HAProxy does write all the pids started by 
itself into the pid file, so the problem is not in HAProxy, but in the 
start-stop-daemon or more likely in the init scrip of haproxy.
  One solution or workaround is to remove pidfile option of start-stop-daemon 
in the init script, than it wil work as killall and will stop the haproxy 
processes properly.
  
  To proof you can try this sequence:
  
  service haproxy start #if its not running
  ps ax | grep haproxy | grep -v grep | wc -l #this should report 2
  service haproxy restart
  ps ax | grep haproxy | grep -v grep | wc -l #this will report 3
  
  The workaround as a diff:
- root@ubi1:/opt# diff /etc/init.d/haproxy /etc/init.d/haproxy.orig 
+ root@ubi1:/opt# diff /etc/init.d/haproxy /etc/init.d/haproxy.orig
  62c62
  <   --retry 5 --exec $HAPROXY || ret=$?
  ---
  >   --retry 5 --pidfile $PIDFILE --exec $HAPROXY || ret=$?
  
  extra infos:
  root@ubi1:/opt# lsb_release -rd
  Description:Ubuntu 14.04.3 LTS
  Release:14.04
  
  root@ubi1:/opt# apt-cache policy haproxy
  haproxy:
-   Installed: 1.4.24-2ubuntu0.2
-   Candidate: 1.4.24-2ubuntu0.2
-   Version table:
-  1.5.3-1~ubuntu14.04.1 0
- 100 http://us.archive.ubuntu.com/ubuntu/ trusty-backports/main amd64 
Packages
-  *** 1.4.24-2ubuntu0.2 0
- 500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
- 100 /var/lib/dpkg/status
-  1.4.24-2 0
- 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
+   Installed: 1.4.24-2ubuntu0.2
+   Candidate: 1.4.24-2ubuntu0.2
+   Version table:
+  1.5.3-1~ubuntu14.04.1 0
+ 100 http://us.archive.ubuntu.com/ubuntu/ trusty-backports/main amd64 
Packages
+  *** 1.4.24-2ubuntu0.2 0
+ 500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
+ 100 /var/lib/dpkg/status
+  1.4.24-2 0
+ 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

** Patch added: "lp1494141_fix_stop_failure.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/haproxy/+bug/1481737/+attachment/4473139/+files/lp1494141_fix_stop_failure.debdiff

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Louis Bouchard]

** Also affects: haproxy (Ubuntu Trusty)
   Importance: Undecided
   Status: New

** Changed in: haproxy (Ubuntu Trusty)
   Importance: Undecided => Medium

** Changed in: haproxy (Ubuntu Trusty)
   Status: New => In Progress

** Changed in: haproxy (Ubuntu Trusty)
 Assignee: (unassigned) => Louis Bouchard (louis-bouchard)

** Changed in: haproxy (Ubuntu)
   Status: Confirmed => Invalid

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Louis Bouchard]

Peter, you will not be able to reproduce on Debian unless you test
versions prior to Stable.

The reason why the stop script does not stop at all processes is because
it relied on the --pidfile option and this one only kills the first PID.
When nproc > 1, the PIDFILE contains all PIDs. This is why debian
introduced the use of --pid in a loop for all haproxy PIDs.

Now, the --pid option that is introduced in dpkg version 1.17.6 as
outlined in the man page of start-stop-daemon :

   [--pid] pid
  Check for a process with the specified pid (since version 
1.17.6). The pid must be a number greater than 0.

This version is available in all Debian releases since Stable but only
available in Ubuntu Wily.  A fix for this situation is available for
haproxy 1.5 which is in trusty-backport (see LP: #1494141).  I will
backport that fix for the stable release and ask for an SRU on this one.

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  HAProxy init script does not work correctly with nbproc configuration
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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Peter G. Marczis]

Hi Louis !
Yes, I have the same understanding of the problem ! So if the fix is available, 
and you do port it, I guess you can close the ticket :)
Thanks a lot for you work and effort !
Br,
 Peter.

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Peter G. Marczis]

No, no, I really want to get my hands dirty. Than first of all I will
try to reproduce on Debian, and then check with them how it goes... In
fact, should I use the newest mainstream version of Debian ? Or do you
have any kind of mappings between Debian and Ubuntu releases ?

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Peter G. Marczis]

Is it really so that I should report the bug to debian via email ?
https://www.debian.org/Bugs/Reporting

Strange... please confirm.
Br,
 Peter.

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[Bug 1481737] Re: HAProxy init script does not work correctly with nbproc configuration option

[Robie Basak]

> Is it really so that I should report the bug to debian via email ?

Assuming the bug does reproduce on Debian and there isn't a bug filed
there already, then yes - someone needs to in order to drive this bug
towards a resolution. If you don't have time for this then that's fine -
this bug can remain open until someone else gets to it.

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