§logrotate

1. See if it installed

root@hc4Jammy:/var/log# /sbin/logrotate --version logrotate 3.19.0

Default mail command:       /usr/bin/mail
Default compress command:   /bin/gzip
Default uncompress command: /bin/gunzip
Default compress extension: .gz
Default state file path:    /var/lib/logrotate/status
ACL support:                yes
SELinux support:            yes

$ logrotate <-- else

2. Create a logrotate configuration file specifically for MongoDB. You can create a new configuration file, for example, /etc/logrotate.d/mongodb:

-@hc4Jammy.yushei.com.tw 

logrotate /var/log/mongoDB-*.log

/var/log/mongoDB-*.log { daily rotate 7 compress delaycompress missingok notifempty create 0640 syslog sudo sharedscripts # su: This stands for "switch user.root:sudo
su root syslog

postrotate
    #    /usr/bin/killall -SIGUSR1 mongod
     /usr/bin/systemctl restart syslog-ng.service >/dev/null 2>&1 || true
endscript

}

or in n2Bookworm.yushei.com.tw

logrotate /var/log/mongodb/mongod.log

/var/log/mongodb/mongod.log { daily rotate 7 compress delaycompress missingok notifempty create 0640 syslog sudo sharedscripts # su: This stands for "switch user.root:sudo
su root syslog

# postrotate
# e.g. /usr/bin/killall -SIGUSR1 mongod
#

}

• daily: Rotates the log file daily.
• rotate 7: Keeps up to 7 rotated log files.
• compress: Compresses rotated log files.
• delaycompress: Postpones compression of the previous log file until the next rotation cycle.
• missingok: Ignores missing log files.
• notifempty: Doesn't rotate the log file if it's empty.
• create: Specifies the permissions and ownership for the newly created log files.
• sharedscripts: Runs the postrotate script only once for all matching log files.
• ?? postrotate: Executes the specified command after rotation. In this case, it sends the SIGUSR1 signal to the mongod process to reopen log files.
• Adjust permissions: Ensure that the user/group specified in the create directive (in this example, mongodb) has write permissions to the log directory.

3. testing sudo logrotate -d

root@hc4Jammy:/var/log# logrotate -d /etc/logrotate.d/mongodb
WARNING: logrotate in debug mode does nothing except printing debug messages!  Consider using verbose mode (-v) instead if this is not what you want.

reading config file /etc/logrotate.d/mongodb
Reading state from file: /var/lib/logrotate/status
Allocating hash table for state file, size 64 entries
Creating new state
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Handling 1 logs

rotating pattern: /var/log/mongoDB-*.log  after 1 days (7 rotations)
empty log files are not rotated, old logs are removed
switching euid from 0 to 0 and egid from 0 to 111 (pid 6646)
considering log /var/log/mongoDB-odroid-01.log
Creating new state
  Now: 2024-05-29 15:33
  Last rotated at 2024-05-29 15:00
  log does not need rotating (log has already been rotated)
not running postrotate script, since no logs were rotated
switching euid from 0 to 0 and egid from 111 to 0 (pid 6646)

root@hc4Jammy:/var/log# ls -l /var/log/mong*
-rw------- 1 root    root     33096 May 29 15:32 /var/log/mongoDB-odroid-01.log
-rw-r--r-- 1 mongodb mongodb 217221 Jul 24  2023 /var/log/mongod.log

4. make it auto

root@hc4Jammy:/var/log# sudo logrotate -f /etc/logrotate.d/mongodb
root@hc4Jammy:/var/log# ls -l /var/log/mongoDB-odroid-01.log*
-rw-r----- 1 syslog sudo     0 May 29 15:38 /var/log/mongoDB-odroid-01.log
-rw------- 1 root   root 35422 May 29 15:35 /var/log/mongoDB-odroid-01.log.1

after logrotate -f then it will do it automatically everyday