Bug 37316

Summary:	logrotate does not trigger UMC components to reopen their logfiles
Product:	UCS	Reporter:	Florian Best <best>
Component:	UMC (Generic)	Assignee:	Florian Best <best>
Status:	CLOSED FIXED	QA Contact:	Alexander Kramer <kramer>
Severity:	normal
Priority:	P5	CC:	best, ebersbach, jmm, klaeser, salm, schwardt, walkenhorst
Version:	UCS 3.2
Target Milestone:	UCS 3.2-4-errata
Hardware:	Other
OS:	Linux
What kind of report is it?:	---	What type of bug is this?:	---
Who will be affected by this bug?:	---	How will those affected feel about the bug?:	---
User Pain:		Enterprise Customer affected?:
School Customer affected?:		ISV affected?:
Waiting Support:		Flags outvoted (downgraded) after PO Review:
Ticket number:		Bug group (optional):	Error handling, External feedback, Troubleshooting
Max CVSS v3 score:
Bug Depends on:	36473, 37159, 38563
Bug Blocks:	37317, 38143

Description Florian Best

2014-12-12 12:09:55 CET

For 3.2-4 errata.
+++ This bug was initially created as a clone of Bug #37159 +++

In case there is a crash with UMC, this problem leads to empty UMC log files:
* logrotate renames the log files → UMC server process still holds the file handle to the moved files
* after a day, logrotate compresses the log file → output into the old file handles is not written anymore to hard disk

In addition to Bug 36473, UMC server would need to handle the corresponding signal emitted by logrotate. 

+++ This bug was initially created as a clone of Bug #36473 +++

logrotate does not trigger the running applications to reopen their logfiles. Thus they are still logging into already deleted files and the log entries are lost.

root@master:~# lsof | grep .log.1
apache2    1445   www-data    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)
apache2    1629   www-data    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)
apache2    5946   www-data    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)
apache2    5947   www-data    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)
apache2    6637   www-data    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)
squid3     8153       root    3u      REG              253,0     18665     399352 /var/log/squid3/cache.log.1 (deleted)
squid3     8156      proxy    3u      REG              253,0     18665     399352 /var/log/squid3/cache.log.1 (deleted)
univentio 11056       root    4u      REG              253,0     37070     400458 /var/log/univention/management-console-web-server.log.1 (deleted)
apache2   11104       root    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)
apache2   18150   www-data    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)
apache2   18157   www-data    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)
apache2   20148   www-data    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)
apache2   23107   www-data    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)
apache2   31323   www-data    3u      REG              253,0      1069     400448 /var/log/univention/management-console-module-lib.log.1 (deleted)

Comment 1 Florian Best

2014-12-12 17:30:18 CET

Logrotate now sends a SIGHUP (1) to the UMC-web-server and UMC-server process.
UMC-server and web-server triggers univention.debug.reload(). A segfault there has been fixed.

Fix: svn r56743 r56744 r56745 r56759 r56760 r56762

2014-12-12-univention-debug.yaml (3.2-3 & 3.2-4)
2014-12-12-univention-management-console-frontend.yaml (only 3.2-4)
2014-12-12-univention-management-console.yaml (3.2-3 & 3.2-4)

Comment 2 Alexander Kramer

2014-12-16 15:07:45 CET

OK - (web)-server and computerrom process still ran after logrotate
OK - new logs got data after logrotate
OK - yaml for debug, console, frontend
OK - changelog console, frontend, debug

Comment 3 Moritz Muehlenhoff

2014-12-17 12:54:35 CET

http://errata.univention.de/ucs/3.2/251.html

Comment 4 Moritz Muehlenhoff

2014-12-17 12:54:49 CET

http://errata.univention.de/ucs/3.2/250.html

Comment 5 Moritz Muehlenhoff

2014-12-17 12:55:20 CET

http://errata.univention.de/ucs/3.2/249.html

Comment 6 Janek Walkenhorst

2014-12-17 15:38:42 CET

http://errata.univention.de/ucs/3.2/256.html