サーバーの完全修飾ドメイン名を確実に解決できません。

私はフォローしていますこれCentos 7で2つの仮想ホストを設定する方法のチュートリアル。

問題は、httpdを再起動すると次のエラーが発生することです。

[userme@server ~]$ sudo systemctl restart httpd.service 
[sudo] password for userme: 
Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details.

私の構成は

[userme@server ~]$ cat /etc/hosts
127.0.0.1   server.workstation.com server
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

[userme@server ~]$ hostname
server.workstation.com

[userme@server ~]$ cat /etc/sysconfig/network
# Created by anaconda
NETWORKING=yes
HOSTNAME=server


[userme@server ~]$ cat /etc/resolv.conf 
# Generated by NetworkManager
search workstation.com
nameserver fe80::1%p3p1
nameserver 192.168.100.1


[userme@server ~]$ domainname 
(none)

リクエストに応じて編集済み

[userme@server ~]$ systemctl status httpd -l
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Thu 2018-01-18 12:55:25 +04; 57min ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 1285 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
  Process: 1283 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
 Main PID: 1283 (code=exited, status=1/FAILURE)

Jan 18 12:55:25 server.workstation.com systemd[1]: Starting The Apache HTTP Server...
Jan 18 12:55:25 server.workstation.com httpd[1283]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using server.workstation.com. Set the 'ServerName' directive globally to suppress this message
Jan 18 12:55:25 server.workstation.com systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
Jan 18 12:55:25 server.workstation.com kill[1285]: kill: cannot find process ""
Jan 18 12:55:25 server.workstation.com systemd[1]: httpd.service: control process exited, code=exited status=1
Jan 18 12:55:25 server.workstation.com systemd[1]: Failed to start The Apache HTTP Server.
Jan 18 12:55:25 server.workstation.com systemd[1]: Unit httpd.service entered failed state.
Jan 18 12:55:25 server.workstation.com systemd[1]: httpd.service failed.


[userme@server ~]$ sudo firewall-cmd --list-all
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: p3p1
  sources: 
  services: ssh dhcpv6-client
  ports: 
  protocols: 
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules:

[userme@server ~]$ apachectl configtest
Syntax OK

自分のネットワーク/ホスト名の設定にどのような問題がありますか？どんな助けでも大変感謝します。