This post is older than a year. Consider some information might not be accurate anymore.
Running a professional Java EE application with JBoss EAP/Wildfly or any other application server involves a good housekeeping strategy for log files. Pay attention that most developers make the mistake to log information twice, hence in most scenarios the default texturation is kept. So the log information will be written into the console.log and server.log. Furthermore if you don’t use a files size rotator, the server.log will be rotated daily. The potential threat is, if you write the logs to separate SAN partition with limited disk space, you might crash the application, if he has no disk space left. To prevent this, one possibility is to use logrotate on Linux for the job.
My applications run in the docker container. To prevent extreme disk usage, server.log and console.log is rotated when 2 GB is reached, 7 rotations mean that he keeps max 14 GB, after 3 days the log files are deleted.
# file size rotation of server.log to prevent full disk space
/var/log/docker/*/server.log {
su root cinhtau
# logrotate automatically by file size 2 GB
size 2G
create 0600 cinhtau cinhtau
# keep only last 7 rotations
rotate 7
copytruncate
compress
missingok
maxage 3
}
/var/log/docker/*/console.log {
su root cinhtau
# logrotate automatically by file size 2 GB
size 2G
create 0600 cinhtau cinhtau
# keep only last 7 rotations
rotate 7
copytruncate
compress
missingok
maxage 3
}
Regular daily rotated server logs are compressed and deleted after 3 days.
# jboss server daily rotated logs
/var/log/docker/*/server.log.????-??-?? {
su root cinhtau
compress
nocreate
nodateext
ifempty
missingok
rotate 1
size 0
start 0
lastaction
# Remove rotated files older than 3 days
find /var/log/docker -name 'server.log.????-??-??-??.0.gz' -mtime +3 -exec rm {} \;
endscript
}
To run the texturation (filename docker_jboss)
/usr/sbin/logrotate /etc/logrotate.d/docker_jboss
To check if the file are rotated
cat /var/lib/logrotate.status
Lets look at an example. Following directory contains before logrotation:
cinhtau@alpha:/var/log/docker/jboss# ls -l
-rw-r--r-- 1 cinhtau cinhtau 3397 Dec 1 10:50 backupgc.log.current
-rw-r--r-- 1 cinhtau cinhtau 356 Dec 2 10:42 fetrace.log
-rw-r--r-- 1 cinhtau cinhtau 6754 Dec 2 12:47 gc.log.0.current
-rw-r--r-- 1 cinhtau cinhtau 1240319 Dec 2 13:30 server.log
-rw-rw-r-- 1 cinhtau cinhtau 7157923 Nov 29 23:57 server.log.2016-11-29
-rw-rw-r-- 1 cinhtau cinhtau 4624286 Nov 30 15:54 server.log.2016-11-30
-rw-r--r-- 1 cinhtau cinhtau 7510470 Dec 1 23:58 server.log.2016-12-01
After log rotation:
cinhtau@alpha:/var/log/docker/jboss# ls -l
-rw-r--r-- 1 cinhtau cinhtau 3397 Dec 1 10:50 backupgc.log.current
-rw-r--r-- 1 cinhtau cinhtau 6754 Dec 2 12:47 gc.log.0.current
-rw-r--r-- 1 cinhtau cinhtau 1251043 Dec 2 13:46 server.log
-rw-rw-r-- 1 cinhtau cinhtau 426809 Nov 29 23:57 server.log.2016-11-29.0.gz
-rw-rw-r-- 1 cinhtau cinhtau 218025 Nov 30 15:54 server.log.2016-11-30.0.gz
-rw-r--r-- 1 cinhtau cinhtau 405076 Dec 1 23:58 server.log.2016-12-01.0.gz
An example for file size rotation.
cinhtau@alpha:/var/log/docker/jboss# ll
-rw-r--r-- 1 cinhtau cinhtau 215609425 Dec 2 14:02 server.log
-rw-r--r-- 1 cinhtau cinhtau 315519951 Dec 2 13:55 server.log.1.gz
-rw-rw-r-- 1 cinhtau cinhtau 143792 Nov 28 23:58 server.log.2016-11-28.0.gz
-rw-rw-r-- 1 cinhtau cinhtau 177975 Nov 29 23:59 server.log.2016-11-29.0.gz
-rw-rw-r-- 1 cinhtau cinhtau 35635494 Nov 30 23:59 server.log.2016-11-30.0.gz
-rw-r--r-- 1 cinhtau cinhtau 206083051 Dec 1 23:59 server.log.2016-12-01.0.gz
