LiteSpeed Admin returns 503 error on CloudLinux Server

LiteSpeed Admin URL returns 503 error and error log shows “cannot allocate memory”. It is due to CloudLinux unlimited setting change. LiteSpeed Admin runs admin_php as “lsadm” user, normally set as “pmem=0K” in LVE, which means unlimited. However CloudLinux enforced “0K” as real “0” instead of “unlimited”, hence execve() function will fail with “cannot allocate memory”.

Quick fix for this is:

lvectl set-user lsadm --pmem=2G