log rotation logrotate

1. The configuration file ：

• /etc/logrotate.conf # Master profile
• /etc/logrotate.d # The files in the changed directory will be read /etc/logrotate.conf, If the files in this directory do not define special parameters , With /etc/logrotate.conf The setting in the file is taken as the default

2. The flow chart is as follows ：

• First execution rotate after , The original messages become messages.1, And it will make a new one messages To store log files
• Second execution ,messages.1 become messages.2,messages become messages.1, Create another one messages
• Third execution ,messages.2 become messages.3,messages.1 become messages.2,messages become messages.1, Create a new messages, Now there are four logs
• The fourth execution ,messages.3 become messages.4,messages.2 become messages.3,messages.1 become messages.2,messages become messages.1, Create a new messages. Now there is messages.4、messages.3、messages.2、messages.1、messages, Delete messages.4
• rotate The numerical value represents the last archived file , Namely xxx.tar.gz file

3. Profile parameter explanation

• weekly：rotate cycle

• rotate： Number of archives retained

• create： The original log file is archived , To create a new log file to store logs

• dateext： End with date

• compress： Whether to compress when archiving

• size： If you set 100K, The trigger condition is that as long as the log size reaches this value, it will be archived

• minsize： If you set 100K, The trigger condition is that the size is greater than 100K And the cycle is

• maxsize： If you set 100K, The trigger condition is that the cycle is up or the size is satisfied