早上有同事问了下CentOS7下/tmp目录下文件目录保留多久，我记得CentOS6下默认好像是30天，CentOS7下不太确认，所以查了下：
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[root@kvm02 tmpfiles.d]
# cd /usr/lib/tmpfiles.d/
[root@kvm02 tmpfiles.d]
# ls
abrt.conf iscsi.conf net-snmp.conf rpcbind.conf spice-vdagentd.conf tuned.conf
cups.conf legacy.conf openlmi-storage.conf rpm.conf svnserve.conf var.conf
cups-lp.conf libselinux.conf pam.conf samba.conf systemd.conf x11.conf
etc.conf libstoragemgmt.conf ppp.conf sap.conf systemd-nologin.conf
gvfsd-fuse-tmpfiles.conf lvm2.conf python.conf selinux-policy.conf tmp.conf
initscripts.conf mdadm.conf radvd.conf setroubleshoot.conf tog-pegasus.conf
[root@kvm02 tmpfiles.d]
# cat /usr/lib/tmpfiles.d/tmp.conf
# 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
v
/var/tmp
1777 root root 30d
# 默认保留时间变为了10天，如果这10天内没做任何调整，估计会被干掉
# 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
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CentOS6的配置文件是在/etc/cron.daily下，有兴趣的朋友自己查下，网上资料比较多
参考资料：
http://blog.csdn.net/zhidetian/article/details/51906335
本文转自 冰冻vs西瓜 51CTO博客，原文链接：http://blog.51cto.com/molewan/1983723，如需转载请自行联系原作者
