CentOS6以下系统(含)使用watchtmp + cron来实现定时清理临时文件的效果,这点在Centos7发生了变化,在CentOS7下,系统使用systemd管理易变与临时文件,与之相关的系统服务有3个:

    systemd-tmpfiles-setup.service  :Create Volatile Files and Directories
    systemd-tmpfiles-setup-dev.service:Create static device nodes in /dev
    systemd-tmpfiles-clean.service :Cleanup of Temporary Directories




    #  This file is part of systemd.
    #  systemd is free software; you can redistribute it and/or modify it
    #  under the terms of the GNU Lesser General Public License as published by
    #  the Free Software Foundation; either version 2.1 of the License, or
    #  (at your option) any later version.

    # See tmpfiles.d(5) for details

    # Clear tmp directories separately, to make them easier to override
    v /tmp 1777 root root 10d           #   清理/tmp下10天前的目录和文件
    v /var/tmp 1777 root root 30d       #   清理/var/tmp下30天前的目录和文件

    # Exclude namespace mountpoints created with PrivateTmp=yes
    x /tmp/systemd-private-%b-*
    X /tmp/systemd-private-%b-*/tmp
    x /var/tmp/systemd-private-%b-*
    X /var/tmp/systemd-private-%b-*/tmp


    x /tmp/tomcat.*
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