linux下应用软件突然丢失的的故障
问题描述:
某小系统早上发现应用软件被删除了,系统无法正常运行,相关人员均为找到原因.OS本版是RHEL6

1，登录主机发现，/dev/sdb1同时挂载了两个文件系统，注意/tmp也被mount

[root@localhost lib]# cat /etc/anacrontab# /etc/anacrontab: configuration file for anacron# See anacron(8) and anacrontab(5) for details.SHELL=/bin/shPATH=/sbin:/bin:/usr/sbin:/usr/binMAILTO=root# the maximal random delay added to the base delay of the jobsRANDOM_DELAY=45# the jobs will be started during the following hours onlySTART_HOURS_RANGE=3-22#period in days   delay in minutes   job-identifier   command1       5       cron.daily              nice run-parts /etc/cron.daily7       25      cron.weekly             nice run-parts /etc/cron.weekly@monthly 45     cron.monthly            nice run-parts /etc/cron.monthly

man cron
Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; The founded crontabs are loaded into memory. Cron also
searches for /etc/anacrontab and the files in the /etc/cron.d directory,


参考资料：
https://access.redhat.com/site/documentation/zh-CN/Red_Hat_Enterprise_Linux/6/html/Migration_Planning_Guide/ch04s14.html