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/var/log/auth.log.1がauth.logよりも小さいのはなぜですか

設定した時間ごとにauth.logファイルをローテーションするcronjobがあることは知っていますが、実際のauth.logと比べてauth.log.1が小さいことに気付きました。 auth.logはauth.log.1に名前変更され、新しいauth.logは作成されませんか？

16.04authenticationlog
1
Tayo Amuneke

はいといいえ：

  • はい、auth.logはauth.log.1に名前が変更されます
  • いいえ、auth.log.1はauth.logよりも小さいとは限りません。これは マシンの使用 に依存するためです。

E.G .:私のマシンで：

ll /var/log/auth*
-rw-r----- 1 syslog adm 209K Nov 30 17:55 /var/log/auth.log
-rw-r----- 1 syslog adm 304K Nov 25 17:08 /var/log/auth.log.1
-rw-r----- 1 syslog adm  27K Nov 18 09:20 /var/log/auth.log.2.gz
-rw-r----- 1 syslog adm  16K Nov 11 07:35 /var/log/auth.log.3.gz
-rw-r----- 1 syslog adm  19K Nov  5 07:35 /var/log/auth.log.4.gz

ただし、他の（古い）ログは圧縮されるため、実際には小さくなります。

4
Fabby

ログローテーションは、タスク用に設計されたlogrotateパッケージによって管理されます。 man logrotateから

NAME
       logrotate ‐ rotates, compresses, and mails system logs

SYNOPSIS
       logrotate [-dv] [-f|--force] [-s|--state file] config_file ..

DESCRIPTION
       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.

       Normally, logrotate is run as a daily cron job.  It will not modify a log more than once in one day unless the criterion for that log is based on the  log's  size  and
       logrotate is being run more than once each day, or unless the -f or --force option is used.

       Any  number  of  config files may be given on the command line. Later config files may override the options given in earlier files, so the order in which the logrotate
       config files are listed is important.  Normally, a single config file which includes any other config files which are needed should be used.  See below for more infor‐
       mation on how to use the include directive to accomplish this.  If a directory is given on the command line, every file in that directory is used as a config file.

       If  no  command line arguments are given, logrotate will print version and copyright information, along with a short usage summary.  If any errors occur while rotating
       logs, logrotate will exit with non-zero status.
2
waltinator