Tomcat临时目录被清理

Springboot启动时会创建一个/tmp/tomcat.*/work/Tomcat/localhost/ROOT的临时目录作为文件上传的临时目录，但是该目录会在n天之后被系统自动清理掉，这个清理是由linux操作系统完成的，具体的配置如下

vim /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

# 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

1. 重启服务（临时目录会自动生成，线上不推荐）
2. 启动时增加参数-Djava.io.tmpdir=自定义目录
3. 项目配置tomcat目录

   server:
　　tomcat:
　　　　basedir: /data/tomcat/tmp


4. 配置linux临时目录不被删除（推荐）

   #修改删除配置文件
vim /usr/lib/tmpfiles.d/tmp.conf

#添加一行
x /tmp/tomcat.*