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Learn How to Manage Various Logs using Logrotate in Linux
Logrotate is designed for administration of Ubuntu systems that generate giant numbers of log records. It allows automatic rotation, compression, removal, and mailing of log records. Each log file could also be handled every day, weekly, monthly, or when it grows. This article explains about -“Learn how to manage various log using logrotate in Linux”
To install logrotate, use the following command –
$ sudo apt-get install logrotate
The sample output should be like this –
Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: libecap3 squid-common squid-langpack Use 'sudo apt autoremove' to remove them. The following NEW packages will be installed: logrotate 0 upgraded, 1 newly installed, 0 to remove and 250 not upgraded. Need to get 37.6 kB of archives. After this operation, 116 kB of additional disk space will be used. Get:1 http://in.archive.ubuntu.com/ubuntu xenial/main amd64 logrotate amd64 3.8.7-2ubuntu2 [37.6 kB] Fetched 37.6 kB in 0s (86.9 kB/s) Selecting previously unselected package logrotate. (Reading database ... 239112 files and directories currently installed.) Preparing to unpack .../logrotate_3.8.7-2ubuntu2_amd64.deb ... Unpacking logrotate (3.8.7-2ubuntu2) ... Processing triggers for man-db (2.7.5-1) ... .................................................................................
To get more options about logrotate, use the following command –
$ logrotate --help
The sample output should be like this –
Usage: logrotate [OPTION...] -d, --debug Don't do anything, just test (implies -v) -f, --force Force file rotation -m, --mail=command Command to send mail (instead of `/usr/bin/mail') -s, --state=statefile Path of state file -v, --verbose Display messages during rotation --version Display version information Help options: -?, --help Show this help message --usage Display brief usage message
The usage of logrotate, should be like this –
Usage: logrotate [-dfv?] [-d|--debug] [-f|--force] [-m|--mail=command] [-s|--state=statefile] [-v|--verbose] [--version] [-?|--help] [--usage] [OPTION...] <configfile>
Example
To get the information about logrotate files, use the following command –
$ cd /etc/logrotate.d/ /etc/logrotate.d$ ls
The sample output should be like this –
apache2 dbconfig-common munin-node speech-dispatcher upstart apport dpkg mysql-server squid yum apt jenkins pm-utils squidguard cacti lightdm ppp ufw cups-daemon munin rsyslog unattended-upgrades
To get the configuration of jenkins, use the following command –
$ sudo nano /etc/logrotate.d/jenkins
The sample output should be like this –
/var/log/jenkins/jenkins.log {
weekly
copytruncate
missingok
rotate 52
compress
delaycompress
notifempty
size 10k
dateext
maxage 10
compresscmd /bin/bzip2
}How To Install Jenkins on Ubuntu
The summary of above result should be like as follows-
weekly – Log records are circled if the current weekday is less then the weekday of the last rotation or if extra then a week has passed seeing that the last rotation.
copytruncate – Truncate the long-established log file in position after growing a duplicate, instead of relocating the old log file and optionally growing a brand new one.
rotate 52 – Log records are turned around 52 instances earlier than being eliminated or mailed to the deal with precise in a mail directive.
compress – The old versions of log records are compressed with gzip with the aid of default.
delaycompress – It delay compression of the previous log file to the subsequent rotation cycle.
notifempty – It do not rotate the log if it is empty.
size 10k – logrotate runsif the filesize is equivalent to (or more prominent than) 10K.
dateext – It archive old versions of log files adding a date extension like YYYYMMDD instead of readily adding number.
maxage 10 – Remove rotated logs older than 10 days.
compresscmd – It specifies which command to use to compress log files.
Corn Job
To get the daily corn job of logrotate, use the following command as shown below –
$ cat /etc/cron.daily/logrotate
The sample ouput should be like this –
#!/bin/sh # Clean non existent log file entries from status file cd /var/lib/logrotate test -e status || touch status head -1 status > status.clean sed 's/"//g' status | while read logfile date do [ -e "$logfile" ] && echo "\"$logfile\" $date" done >> status.clean mv status.clean status test -x /usr/sbin/logrotate || exit 0 /usr/sbin/logrotate /etc/logrotate.conf
To get the status of logrotate, use the following command –
$ cat /var/lib/logrotate/status
The sample ouput should be like this –
logrotate state -- version 2 "/var/log/syslog" 2017-1-23-9:14:34 "/var/log/cacti/cacti.log" 2017-1-23-9:14:34 "/var/log/mail.log" 2017-1-23-9:14:34 "/var/log/kern.log" 2017-1-23-9:14:34 "/var/log/cups/error_log" 2016-12-17-14:5:58 "/var/log/mysql.log" 2017-1-23-9:0:0 "/var/log/ufw.log" 2017-1-23-9:0:0 "/var/log/cacti/rrd.log" 2017-1-9-11:0:0 "/var/log/lightdm/seat0-greeter.log" 2017-1-23-9:14:34 "/var/log/cacti/poller-error.log" 2017-1-9-11:0:0 "/var/log/munin/munin-update.log" 2017-1-17-9:58:3 "/var/log/speech-dispatcher/speech-dispatcher.log" 2017-1-23-9:0:0 "/var/log/debug" 2017-1-23-9:0:0 "/var/log/yum.log" 2017-1-17-9:0:0 "/var/log/munin/munin-node.log" 2017-1-23-9:14:34 ........................................................................
In the above article, we have learnt about – Learn how to manage various log using logrotate in Linux. In our next articles, we will come up with more Linux based tricks and tips. Keep reading.
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