Gitlab getting 502 error response in ubuntu 20.04

Hi All,

I am getting 502 error response in Ubuntu 20 server, Can someone please help me to fix this?

My server configuration is

                total        used      free      shared  buff/cache   available

Mem: 29 6 6 0 16 22
Swap: 15 0 15

Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 43 bits physical, 48 bits virtual
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4