apache httpd on centos

sudo yum install httpd mod_ssl
systemctl status httpd
systemctl start httpd
Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details.
systemctl status httpd.service

httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Sat 2018-04-28 02:58:49 CEST; 12s ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 25955 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
  Process: 25951 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
 Main PID: 25951 (code=exited, status=1/FAILURE)

sudo su -
cd /var/log/httpd/
less error_log

[Sat Apr 28 02:58:49.199587 2018] [core:notice] [pid 25951] SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0
[Sat Apr 28 02:58:49.222124 2018] [suexec:notice] [pid 25951] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Sat Apr 28 02:58:49.223152 2018] [ssl:emerg] [pid 25951] (13)Permission denied: AH02201: Init: Can't open server certificate file /home/centos/myapp/mysitename.crt
[Sat Apr 28 02:58:49.223168 2018] [ssl:emerg] [pid 25951] AH02312: Fatal error initialising mod_ssl, exiting.

less /etc/httpd/conf/httpd.conf

<VirtualHost *:443>
  DocumentRoot /var/www/website
  ServerName www.yourdomain.com
  SSLEngine on
  SSLCertificateFile "/home/centos/myapp/mysitename.crt"
  SSLCertificateKeyFile "/home/centos/myapp/mysitename.key"
</VirtualHost>

sudo /usr/sbin/httpd -S

AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain. Set the 'ServerName' directive globally to suppress this message
VirtualHost configuration:
*:443                  is a NameVirtualHost
         default server www.yourdomain.com (/etc/httpd/conf/httpd.conf:107)
         port 443 namevhost www.yourdomain.com (/etc/httpd/conf/httpd.conf:107)
         port 443 namevhost localhost.localdomain (/etc/httpd/conf.d/ssl.conf:56)
ServerRoot: "/etc/httpd"
Main DocumentRoot: "/var/www/html"
Main ErrorLog: "/etc/httpd/logs/error_log"
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
Mutex proxy: using_defaults
Mutex authn-socache: using_defaults
Mutex ssl-cache: using_defaults
PidFile: "/run/httpd/httpd.pid"
Define: _RH_HAS_HTTPPROTOCOLOPTIONS
Define: DUMP_VHOSTS
Define: DUMP_RUN_CFG
User: name="apache" id=48
Group: name="apache" id=48

See also http://www.javamonamour.org/2018/02/apache.html