Recently, due to a recent project, but the project itself does not do log scrolling, resulting in log has been growing, so it will certainly burst the disk, resulting in unpredictable results this suitable logrotate appearedCopy the code

role

 logrotate is designed to ease administration of systems that generate large numbers of log files. It allows automatic rotation, compression, removal,   
  and mailing of log files. Each log file may be handled daily, weekly, monthly, or when it grows too large.
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As described by Man Logrotate, Logrotate can automatically rotate, compress, delete logs, and send emails

use

root@49335c6e5ee3:/var/log# logrotate --help Usage: logrotate [OPTION...]  <configfile> -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 -l, --log=STRING Log file or 'syslog' to log to syslog --version Display version information Help options: -? , --help Show this help message --usage Display brief usage messageCopy the code

The logrotate configfile file can be manually executed.

/var/log/cron.log {
  daily
  rotate 7
  notifempty
  create
  size 1K
  nocompress
  nodateext
  missingok
}
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explain

parameter instructions
daily According to the days roll
rotate Number of files retained
notifempty If the log is empty, scroll
create New log files are created after the old log files are replaced
size Log scrolling is performed when the number of logs reaches
nocompress Log files are not compressed
nodateext Log files are incremented numerically, for example, log.1
missingok If the log file does not exist, no error is reported

For details, see Man Logrotate

Operation mechanism

For cron-installed systems,crontab will execute the script in /etc/cron.daily on a daily basis. This directory has a file called Logrotate:

#! /bin/sh test -x /usr/sbin/logrotate || exit 0 /usr/sbin/logrotate /etc/logrotate.confCopy the code

/usr/sbin/logrotate /etc/logrotate.conf /etc/logrotate.conf /usr/sbin/logrotate /etc/logrotate.conf

# see "man logrotate" for details
# rotate log files weekly
weekly

# use the syslog group by default, since this is the owning group
# of /var/log/syslog.
su root syslog

# keep 4 weeks worth of backlogs
rotate 4

# create new (empty) log files after rotating old ones
create

# uncomment this if you want your log files compressed
#compress

# packages drop log rotation information into this directory
include /etc/logrotate.d

# no packages own wtmp, or btmp -- we'll rotate them here
/var/log/wtmp {
    missingok
    monthly
    create 0664 root utmp
    rotate 1
}

/var/log/btmp {
    missingok
    monthly
    create 0660 root utmp
    rotate 1
}

# system-specific logs may be configured here
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Logrotate. d: include /etc/logrotate.d: include /etc/logrotate.d: include /etc/logrotate.d: include /etc/logrotate.d: include /etc/logrotate.d: include /etc/logrotate.d: include /etc/logrotate.d: include /etc/logrotate.d: include /etc/logrotate.d: include

/etc/logrotate.d/*   
/etc/logrotate.conf
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