Weird privilege errors on Ubuntu 20.04

[hgv]

Hi Sergey,

Adding www-data user to ssl-cert group doesn't help.

root at k2# usermod -a -G ssl-cert www-data

root at k2# getent group ssl-cert
ssl-cert:x:112:postgres,www-data


Sergey A. Osokin Wrote:
-------------------------------------------------------
> Hi there,
> 
> hope you're doing well.
> 
> On Tue, Jun 08, 2021 at 11:46:32AM -0700, Palvelin Postmaster wrote:
> > I wonder what can cause these weird error log entries? The log
> entries indicate a PID which doesn’t exist. Does nginx launch some
> temporary process when it starts?
> > 
> > Nginx 1.21.0 on Ubuntu 20.04.
> > 
> > root at k2:~# systemctl restart nginx
> > 
> > root at k2:~# tail /var/log/nginx/error.log
> > 2021/06/08 21:25:32 [warn] 1287733#1287733: the "user" directive
> makes sense only if the master process runs with super-user
> privileges, ignored in /etc/nginx/nginx.conf:21
> > 2021/06/08 21:25:32 [emerg] 1287733#1287733: cannot load certificate
> key "/etc/ssl/private/nginx-selfsigned.key": BIO_new_file() failed
> (SSL: error:0200100D:system library:fopen:Permission
> denied:fopen('/etc/ssl/private/nginx-selfsigned.key','r')
> error:2006D002:BIO routines:BIO_new_file:system lib)
> 
> Seems like an attempt to start nginx without root privileges.
> 
> > root at k2:~# ls -lh /etc/ssl/private/ |grep selfsigned
> > -rw-r----- 1 root ssl-cert 1.7K Jul  8 17:12 nginx-selfsigned.key
> > 
> > root at k2:~# cat /etc/nginx/nginx.conf |grep ^user
> > user www-data;
> > 
> > root at k2:~# ps -auxw |grep nginx
> > root     1287600  0.0  0.0  56148  6504 ?        Ss   21:25   0:00
> nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
> > www-data 1287601  0.7  0.1  58544 15652 ?        S    21:25   0:05
> nginx: worker process
> > www-data 1287602  0.0  0.1  57556 13696 ?        S    21:25   0:00
> nginx: worker process
> > www-data 1287603  0.0  0.1  56392  9184 ?        S    21:25   0:00
> nginx: cache manager process
> 
> Could you check `www-data' user permission, and add, if necessary, to
> the `ssl-cert' group.
> 
> -- 
> Sergey Osokin
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Posted at Nginx Forum: https://forum.nginx.org/read.php?2,291799,291801#msg-291801