What would likely cause directories in /var/run to disappear / not be created on startup? (CentOS 7.3) Ran into an issue today where Apache would not load because `/var/run/httpd` was missing. After much hunting to find that cause of the error I was getting (`[Tue Jul 25 00:06:31.574386 2017] [auth_digest:error] [pid 6179] (2)No such file or directory: AH01760: failed to initialize shm - all nonce-count checking, one-time nonces, and MD5-sess algorithm disabled`). Then I saw that MariaDB was missing its `/var/run/mysql` directory, and PostgreSQL was missing its directory. What would cause those to not be made on system start-up / saved between reboots? I would not _expect_ to need to modify init scripts as suggested in this question. ### Edit: outputs of `ls -dl /var/run` & `ls -dl /run` lrwxrwxrwx. 1 root root 6 Dec 15 2015 /var/run -> ../run drwxr-xr-x 25 root root 800 Jul 26 03:40 /run

## Not a fix - but a fix.

After trawling through other SE network sites, forums, newsgroups, and the like, I wondered if it might be related to mount order for local and remote file systems (there are a pair of CIFS shares mounted on this server, which each have subdirectories bind mounted elsewhere).

I pushed the CIFS shares higher in `/etc/fstab`, and moved all bind mounts to the bottom.

Then I rebooted.

Now `/run` aka `/var/run` is working as expected.

I don't _know_ that editing `/etc/fstab` mattered - but it's the only substantive change made that I know of.