Setau sy Virtual Memory rekomendasi untuk di disable mas.. cek di
https://docs.cloudlinux.com/index.html?memory_limits.html krn bisa jadi penyebab 503 itu.. jd yang di set Physical memory aja..
dari forum CL:
"There is no reason to use Virtual Memory in CL6. It is there only because this is what we were able to provide initially -- and because it is the only memory limit we have in CL5. Right now, NPROC and physical memory limits are much better than virtual memory limits."
