Hi there,
Looks like this ESXi host is added to an AD domain and the "Likewise" provider that VMware are using to provide this functionality is causing this:
./likewise/db: total 28388 -rw------- 1 root root 27.6M Feb 19 01:12 lsass-adcache.filedb.CAMPUS.MCGILL.CA.new -r--r--r-T 1 root root 60.0K Jan 8 03:13 .#registry.db -rwx------ 1 root root 44.0K Feb 19 00:57 registry.db -rw------- 1 root root 3.1K Feb 19 01:03 lsass-adcache.filedb.CAMPUS.MCGILL.CA drwx------ 1 root root 512 Feb 19 01:12 . drwxr-xr-x 1 root root 512 Feb 19 00:56 .. -rw-r--r-T 1 root root 0 Jan 8 03:13 pstore.filedb
The file "lsass-adcache.filedb.CAMPUS.MCGILL.CA.new" is 27.6MB in size and this will be consuming all the /etc space.
Your next question will be can I remove this file - this files seems to be an AD cache file so while I have not been able to find an official VMware document related to newer versions of ESXi however this article seems to imply the answer is yes:
https://kb.vmware.com/s/article/1026012?lang=en_US
Here is another implying the same thing: Not able to login to ESXi with Domain Account. Error: Cannot login to domain\user | IT Support Rocket
After completing and restarting ESXi, just check that the ESXi server is still connected to AD. If not then reconnect.
Kind regards.