tom lee writes:
my machine was mounted as rw for directory "/", it works fine for a while for sending out emails. then I find the machine was changed to mount as read only for directory "/". I cannot create any files in the directory / including /tmp, nor can I send out emails of course. it complains the file system is read-only. running "mount" command shows the machine is mounted as "rw". I checked no more log files modified any more under /var/log directory. reboot the machine, the problem is gone. any possible the machine got hacked or is there a way to check what caused this problem?
Your root filesystem probably got corrupted. When the kernel detects filesystem corruption, the partition usually gets remounted read-only.
Run "shutdown -r -F now". This will reboot and refsck your root partition.
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