apache-server-logo

Apache is the most popular open-source webserver. It is also called httpd in Centos/Redhat distributions.

Begin by checking if the server is running or not:

[debian.linuxnix] root:~/ # service apache2 status
Apache2 is running (pid 2082).

On Centos you can use the service command or the command below which gives more informations:

[centos.linuxnix] root:~ # apachectl status
● httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2016-10-13 10:53:26 CEST; 1 months 4 days ago
Docs: man:httpd(8)
man:apachectl(8)
Process: 27054 ExecReload=/usr/sbin/httpd $OPTIONS -k graceful (code=exited, status=0/SUCCESS)
Main PID: 1179 (httpd)
Status: "Total requests: 0; Current requests/sec: 0; Current traffic: 0 B/sec"
CGroup: /system.slice/httpd.service
├─ 1179 /usr/sbin/httpd -DFOREGROUND
├─ 6529 /usr/sbin/httpd -DFOREGROUND
├─ 8835 /usr/sbin/httpd -DFOREGROUND
├─ 8858 /usr/sbin/httpd -DFOREGROUND
├─ 8859 /usr/sbin/httpd -DFOREGROUND
├─ 8860 /usr/sbin/httpd -DFOREGROUND
├─ 8861 /usr/sbin/httpd -DFOREGROUND
├─27059 /usr/sbin/httpd -DFOREGROUND
├─27060 /usr/sbin/httpd -DFOREGROUND
├─27061 /usr/sbin/httpd -DFOREGROUND
└─27062 /usr/sbin/httpd -DFOREGROUND

Nov 13 03:36:01 vps24699.ovh.net systemd[1]: Reloaded The Apache HTTP Server.

When you modify your vhosts configurations you can check syntax by using commands below:

[debian.linuxnix] root:~/ # apache2ctl configtest
Syntax OK
[debian.linuxnix] root:~/ # apache2ctl -t
Syntax OK

Now, to list all running vhosts, you can use :

[debian.linuxnix] root:~/ # apache2ctl -S
VirtualHost configuration:
wildcard NameVirtualHosts and _default_ servers:
_default_:443          211.ip-5-126-0.eu (/etc/apache2/sites-enabled/001-default-ssl:2)
*:8080                 is a NameVirtualHost
         default server 211.ip-5-126-0.eu (/etc/apache2/sites-enabled/000-default:2)
         port 8080 namevhost 211.ip-5-126-0.eu (/etc/apache2/sites-enabled/000-default:2)
         port 8080 namevhost agency (/etc/apache2/sites-enabled/agency:2)
         port 8080 namevhost janux-dashboard (/etc/apache2/sites-enabled/janux-dashboard:2)
         port 8080 namevhost vh1 (/etc/apache2/sites-enabled/vh1:2)
Syntax OK

You can see that :

  • There are 4 loaded vhosts listening on port 8080.
  • The default vhost is also listening on port 443 for HTTPS.

On Centos we can use:

[centos.linuxnix] root:~ # apachectl -S
VirtualHost configuration:
*:80                   localhost (/etc/httpd/conf.d/s9s.conf:1)
*:443                  cc.severalnines.local (/etc/httpd/conf.d/ssl.conf:2)
ServerRoot: "/etc/httpd"
Main DocumentRoot: "/var/www/html"
Main ErrorLog: "/etc/httpd/logs/error_log"
Mutex proxy: using_defaults
Mutex authn-socache: using_defaults
Mutex ssl-cache: using_defaults
Mutex default: dir="/run/httpd/" mechanism=default
Mutex mpm-accept: using_defaults
Mutex authdigest-opaque: using_defaults
Mutex proxy-balancer-shm: using_defaults
Mutex rewrite-map: using_defaults
Mutex authdigest-client: using_defaults
Mutex ssl-stapling: using_defaults
PidFile: "/run/httpd/httpd.pid"
Define: DUMP_VHOSTS
Define: DUMP_RUN_CFG
User: name="apache" id=48
Group: name="apache" id=48

On Centos listing vhosts with the command above shows some important informations like:

  • Main DocumentRoot : path in which HTML pages are stored (HTML, CSS, PHP, JS,…)
  • Main ErrorLog
  • Pidfile
  • user & group

I hope that this blog helped you. Please visit our blog website for other interesting blogs and feel free to leave your feedbacks and comments. Till next time

The following two tabs change content below.
I am a hands-on, competent Linux system engineer with 5 years’ experience. I have a strong performance background in wide variety of professional Linux system support including monitoring, configuration, troubleshooting and maintenance. I have worked on numerous projects from concept to completion. A specialist in LAMP platforms, I take pride in administrating Linux systems and regularly refresh my skills to ensure I keep up with ongoing developments and new technologies.