Reload of NGinX doesnt kill some of the older worker processes

[Maxim Dounin]

Hello!

On Mon, May 15, 2017 at 06:54:47AM -0400, shivramg94 wrote:

> I am facing an issue where once I issued a reload to the NGinX binary, few
> of the older worker processes are not dying. They still remain orphaned. 
> 
> This is the configuration before issuing a reload :
> 
> [poduser at ucfc2z3a-1582-lb8-nginx1 logs]$ ps -ef | grep nginx
> poduser  12540 22030  0 06:39 ?        00:00:00 nginx: worker process       
>    
> poduser  12541 22030  0 06:39 ?        00:00:00 nginx: worker process       
>    
> poduser  12762 11601  0 06:41 pts/0    00:00:00 grep nginx
> poduser  22030     1  1 May12 ?        00:49:01 nginx: master process
> /u01/app/Oracle_Nginx/sbin/nginx
> poduser  23528 22030  0 May12 ?        00:00:22 nginx: worker process       
>    
> poduser  24950 22030  0 May12 ?        00:00:22 nginx: worker process 
> 
> Configuration after issuing a relaod
> 
> [poduser at ucfc2z3a-1582-lb8-nginx1 logs]$ ps -ef | grep nginx
> poduser  13280 22030  2 06:45 ?        00:00:00 nginx: worker process       
>    
> poduser  13281 22030  2 06:45 ?        00:00:00 nginx: worker process       
>    
> poduser  13323 11601  0 06:45 pts/0    00:00:00 grep nginx
> poduser  22030     1  1 May12 ?        00:49:02 nginx: master process
> /u01/app/Oracle_Nginx/sbin/nginx
> poduser  23528 22030  0 May12 ?        00:00:22 nginx: worker process       
>    
> poduser  24950 22030  0 May12 ?        00:00:22 nginx: worker process     
> 
> If you notice, there are two worker processes orphaned with PID's 23528 and
> 24950. Could someone please explain the cause for this, as to why few of the
> worker processes are orphaned?

>From the "nginx: worker process" process titles it look like these 
processes were not notified they are expected to shut down.  This 
may happen if notification fail for some reason - for example, 
due to inapropriate system limits.  Try checking error logs, it 
may shed some light on what happended.

-- 
Maxim Dounin
http://nginx.org/