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DescriptionOyvind Albrigtsen
2015-12-16 10:59:55 UTC
+++ This bug was initially created as a clone of Bug #1263348 +++
Description of problem:
The mysql resource agent leaks the check_slave... tmpfile and thus floods the /var/run/resource-agents directory with check_slave.* files which are not cleaned up, eventually leading to a filled partition or inode shortage.
Version-Release number of selected component (if applicable):
bash-4.2.46-12.el7.x86_64 (CentOS 7.1.1503)
resource-agents-3.9.5-40.el7_1.6.x86_64 (CentOS 7.1.1503)
How reproducible:
always
Steps to Reproduce:
1. Setup mysql Master/Slave Pacemaker cluster
2. Look at the /var/run/resource-agents directory
3.
Actual results:
Hundreds and thousands of left over check_slave.* files in /var/run/resource-agents
Expected results:
None to a few check_slave.* files in /var/run/resource-agents
Additional info:
I did some debugging and the problem seems to boil down to a strings behaviour in /usr/lib/ocf/resource.d/heartbeat/mysql:
1. The function check_slave() creates the file through the get_slave_info() function in line 378
2. Later on the file should be deleted. Actually the execution goes through line 504 which should delete the file using rm -f $tmpfile
3. Debugging shows that the $tmpfile variable is empty when the rm -f $tmpfile happens. The $tmpfile variable seems to be scoped to the get_slave_info() function, though there is no 'local' declaration in the function.
--- Additional comment from Fabio Massimo Di Nitto on 2015-09-15 19:33:31 CEST ---
Looking at the code, there are tons of conditions inside the agent that can lead to file temporary file leaks beside the normal runtime monitoring issue.
I have never used mysql is master/slave mode (where this code path is leaking). Can you please share your configuration so i can set it up easily to verify any fix?
Thanks
--- Additional comment from Frank Enderle on 2015-10-02 18:40:35 CEST ---
I'm currently unable to produce a test case. I will try to find the time in the next week, so please do not autoclose this bug.
--- Additional comment from Oyvind Albrigtsen on 2015-12-16 11:18:21 CET ---
OCF_CHECK_LEVEL=10 is required to reproduce the issue:
# pcs resource op add MySQL monitor interval=15s OCF_CHECK_LEVEL=10
I tested and verified that the following patch solves the issue:
https://github.com/ClusterLabs/resource-agents/pull/722
Comment 2Oyvind Albrigtsen
2015-12-16 11:01:38 UTC
Tested and verified that the patch is working as expected on RHEL6 as well.
Comment 3Oyvind Albrigtsen
2015-12-21 12:23:34 UTC
Create MySQL service with pcs and run the following command to be able to reproduce the issue:
# pcs resource op add MySQL monitor interval=60s OCF_CHECK_LEVEL=10
Before:
New /var/run/resource-agents/check_slave.mysql.XXXXXX created on slave-node every minute (or other interval you set it to).
After:
/var/run/resource-agents/check_slave.mysql.XXXXXX files are deleted after being used by the resource agent.
Comment 4Oyvind Albrigtsen
2015-12-24 12:52:05 UTC
Setup:
# pcs resource create MySQL mysql
# pcs resource master MySQL
# pcs resource op add MySQL monitor interval=15s OCF_CHECK_LEVEL=10
Run on the slave node.
Before:
# rpm -q resource-agents
resource-agents-3.9.5-24.el6_7.1.x86_64
# ls /var/run/resource-agents/check_slave.*
/var/run/resource-agents/check_slave.MySQL.uCeh9f
Wait at least 15 seconds.
# ls /var/run/resource-agents/check_slave.*
/var/run/resource-agents/check_slave.MySQL.uCeh9f
/var/run/resource-agents/check_slave.MySQL.uxRvQo
After:
# ls /var/run/resource-agents/check_slave.*
/var/run/resource-agents/check_slave.MySQL.uCeh9f
/var/run/resource-agents/check_slave.MySQL.uxRvQo
Wait at least 15 seconds.
# ls /var/run/resource-agents/check_slave.*
/var/run/resource-agents/check_slave.MySQL.uCeh9f
/var/run/resource-agents/check_slave.MySQL.uxRvQo
The same number of files (from before the patch still exist, but will be removed on reboot).
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2016-0735.html