How To Install and Configure Log Rotation on RHEL 7 or CentOS 7

How To Install and Configure Log Rotation on RHEL 7
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Table of Contents
Overview.......................................................................................................................................................1
Applies To......................................................................................................................................................1
Pre-Requisites ...............................................................................................................................................1
Check Package...........................................................................................................................................1
Install Package...........................................................................................................................................1
Verify Package...........................................................................................................................................2
Configuration Files / Location...................................................................................................................2
Logrotate – Configuration File ..............................................................................................................2
Logrotate – Configuration Directory to Include....................................................................................3
Logrotate – httpd Script............................................................................................................................3
Httpd – Rotation Script .........................................................................................................................3
logrotate – Run Status ..............................................................................................................................4
logrotate Manually....................................................................................................................................5
logrotate Manually - Verbose ...................................................................................................................5
logrotate Manually – Debug .....................................................................................................................5
logrotate Manually – All Configs...............................................................................................................6
logrotate – Custom Application Log .........................................................................................................6
Tomcat – Rotation Script – One Log File...............................................................................................6
logrotate – Custom Application Multiple Filters.......................................................................................7
Tomcat – Rotation Script – Multiple Filters ..........................................................................................7
Configurable Options....................................................................................................................................8
Shell Script - MoveOldLogs.sh...................................................................................................................9
PostRotate - Option ................................................................................................................................10

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Overview
All the services or applications deployed on the system, generates event log’s in a file for each action that
is performed on the system / application / user. Over a period of time it becomes a tedious task to manage
such log files and grows in humongous sizes and the application performance would deteriorate
periodically.
To mitigate such issues and maintain log files we utilize “logrotate” which is designed to ease
administration. It takes care of automatic log file rotation, compression, removal and mailing of log files.
It can be configured to maintain logs file on daily, weekly monthly or when the size of the file is grown to
a specific size.
Ideally, logrotate is run as a cron job. To test or run manually you can run command “logrotate” with “-f”
parameter along with the configuration file.
Applies To
Tested on RHEL 7, CentOS 7, though it can be configured on most of the *nix flavor of OS.
Pre-Requisites
 logrotate
Check Package
Install the logrotate package, run the command
rpm -qa | grep logrotate
Install Package
Install the logrotate package, run the command;
yum install logrotate -y

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Verify Package
To verify the logrotate package is installed, run the command;
rpm -qa | grep logrotate
Configuration Files / Location
By default, when the logrotate is installed. All the Configuration files “/etc/logrotate.conf” that are
configured.
/etc/logrotate.conf Default configuration file
/etc/logrotate.d/ Default directory for different service or application configuration file location
Logrotate – Configuration File
Default configuration file is configured as below. To display current configuration without comments, run
command;
grep -v "#" /etc/logrotate.conf
weekly
rotate 4
create
dateext
include /etc/logrotate.d
/var/log/wtmp {
monthly
create 0664 root utmp
minsize 1M
rotate 1
}
/var/log/btmp {
missingok
monthly
create 0600 root utmp
rotate 1
}

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Logrotate – Configuration Directory to Include
The directive “include /etc/logrotate.d” that is configured, instructs the service to include the
configuration files in the directory “/etc/logrotate.d”.
cd /etc/logrotate.d/
ls -l
Logrotate – httpd Script
A sample script, which show as to how to configure log rotation for “/var/log/httpd/” location for all
“*.log” which is filtered files.
Httpd – Rotation Script
/var/log/httpd/*log {
missingok
notifempty
sharedscripts
delaycompress
postrotate
/bin/systemctl reload httpd.service > /dev/null 2>/dev/null || true
endscript
}

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logrotate – Run Status
To validate the logrotate run status for each configuration file and know the status of each one of them,
run the command; It will list run time for each config file.
cat /var/lib/logrotate.status

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logrotate Manually
To run manually logrotate run the command below for specific configuration file.
logrotate -f /etc/logrotate.d/tomcat
logrotate Manually - Verbose
To verbose logrotate run the command below;
logrotate -v -f /etc/logrotate.d/tomcat
logrotate Manually – Debug
To debug logrotate and redirect the logs to a file, run the command below;
logrotate -d /etc/logrotate.conf 2> /tmp/logrotate.debug

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logrotate Manually – All Configs
To rotate all the logs and in verbose mode, run the command below;
logrotate -f -v /etc/logrotate.conf
logrotate – Custom Application Log
To configure logrotate for a custom application. Create a new config file and configure the options for log
rotation in the folder “/etc/logrotate.d/”. We will be rotating a specific file “catalina.out” only. Set
options for the log rotation accordingly.
vi /etc/logrotate.d/tomcat
Tomcat – Rotation Script – One Log File
/usr/local/apache-tomcat-6.0.20/logs/catalina.out {
copytruncate
daily
dateext
rotate 30
size 100M
notifempty
missingok
compress
postrotate
/usr/bin/MoveOldLogs.sh || true
endscript
}

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logrotate – Custom Application Multiple Filters
To configure logrotate for a custom application. Create a new configuration file and configure the options
for log rotation in the folder “/etc/logrotate.d/”.
We will be rotating a specific file “catalina.out” only. Another path wherein we will configure to rotate
filter files “*.log” for the paths. Similarly we can configure for different paths.
File Type #1 /usr/local/apache-tomcat-6.0.20/logs/catalina.out
File Type #2 /usr/local/apache-tomcat-6.0.20/logs/*.log
logrotate -v -f /etc/logrotate.d/tomcat
Tomcat – Rotation Script – Multiple Filters
/usr/local/apache-tomcat-6.0.20/logs/catalina.out /usr/local/apache-tomcat-6.0.20/logs/*.log {
copytruncate
daily
dateext
rotate 30
size 100M
notifempty
missingok
compress
postrotate
/usr/bin/MoveOldLogs.sh || true
endscript
}

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Configurable Options
A lot of other configurable options and with its function.
Options Function
compress To compress the rotated log file with gzip
nocompress Compression is disabled
copytruncate When processes are still writing information to open log files. It will copy the
active log file to a backup file and truncates the active log file
nocopytruncate Will copy the log files to backup file, but the open log file will not be
truncated
create mode owner
group
rotates the log file and creates a new log file with the specified permissions,
owner, and group.
The default is to use the same mode, owner, and group as the original file
nocreate prevents the creation of a new log file creation
delaycompress It’s used with the compress option is set, then rotated log file is not
compressed until the next time it is cycled
nodelaycompress overrides delaycompress. The log file is compressed when it is cycled
errors address If logrotate encounters errors to an email address
ifempty Log file is rotated even if it is empty. It’s the default setting
notifempty Does not rotate the log file, if it is empty file or zero byte file
mail address This mails log files that are cycled to an address. When mail log files are
cycled, they are effectively removed from the system
nomail When mail log files are cycled, a copy is not mailed
olddir directory With this, cycled log files are kept in the specified directory. This directory
must be on the same filesystem as the current log files

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noolddir Cycled log files are kept in the same directory as the current log files
prerotate/endscript Before rotation run. The prerotate and endscript invoke task or script, check
script below.
postrotate/endscript After rotation run. The postrotate and endscript invoke task or script, check
script below.
daily To rotate log files daily
weekly To rotate log files weekly
monthly To rotate log files monthly
rotate count Specifies the number of times to rotate a file before it is deleted. 0 (zero)
means no copies are retained. In case you set it as 7, seven copies are
retained.
tabootext [+] list directs logrotate to not rotate files with the specified extension. The default
list of extensions is .rpm-orig, .rpmsave, v, and ~.
size size With this, the log file is rotated when the specified size is reached. Size may
be specified in bytes (default), kilobytes (sizek), or megabytes (sizem).
Shell Script - MoveOldLogs.sh
#!/bin/bash
LogPath=/usr/local/apache-tomcat-6.0.20/logs/
LogFileName=catalina.out
LogDate=$(date +"%m%d%Y")
MoveFileName=${LogPath}${LogFileName}
DestPath=/var/log/archive-logs/apache-tomcat/
#
# Create Destination path if it doesn't exists
#
if [ ! -d ${DestPath} ]; then
mkdir -p ${DestPath}
fi
#
# Move the file to a archive folder
#
mv ${MoveFileName} ${DestPath}${LogFileName}.${LogDate}
gzip ${DestPath}/${LogFileName}.${LogDate}
exit

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PostRotate - Option
Invoke command / task between postrotate and endscript tags.
postrotate
/bin/systemctl reload httpd.service > /dev/null 2>/dev/null || true
endscript

How To Install and Configure Log Rotation on RHEL 7 or CentOS 7

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