环境说明

  • CentOS Linux release 8.3.2011

问题说明

磁盘占用90%,利用df -hl & du -sh命令找到
/var/log/messages
/var/log/journal
占用过多,分析日志查看原因
大量:

Jun 20 03:40:31 iZbp14vt99zpj8dde2fdlmZ crond[208986]: No configuration file found at /root/.esmtprc or /etc/esmtprc

解决步骤

查看当前日志占用磁盘的空间的总大小

journalctl --disk-usage

[root@iZbp14vt99zpj8dde2fdlmZ journal]# journalctl --disk-usage 
Archived and active journals take up 3.9G in the file system.

指定日志文件保存多久

保存最近一周:journalctl --vacuum-time=1w
保存最近一年:journalctl --vacuum-time=1years

[root@iZbp14vt99zpj8dde2fdlmZ journal]# journalctl --vacuum-time=1w
Vacuuming done, freed 0B of archived journals from /var/log/journal/20210318142909815972522070876808.

指定日志文件最大空间

只保留500MB的日志:journalctl --vacuum-size=500M
只保留1GB的日志:journalctl --vacuum-size=1G

[root@iZbp14vt99zpj8dde2fdlmZ journal]# journalctl --vacuum-size=500M
Vacuuming done, freed 3.5G of archived journals from /var/log/journal/20210318142909815972522070876808.

/var/log/messages

问题:No configuration file found at /root/.esmtprc or /etc/esmtprc
参考:
No configuration file found at /root/.esmtprc or /etc/esmtprc

Centos 7:yum install -y postfix
Centos 8:dnf install -y postfix