Directory service pada Centos 7

Pada artikel sebelumnya kita telah membahas bagaimana systemctl ini melakukan manajemen untuk service-service yang ada Centos 7. Kemudian kita mungkin bertanya-tanya di mana letak file service ini ? Pada artikel kali ini kita akan membahas mengenai lokasi directory dari service-service yang ada Centos 7.

Letak directory yang berisi service-service ini ada di /usr/lib/systemd/system . Berikut kita akan mencoba hal-hal berikut ini

1. Melihat daftar beberapa service
   Service-service ini memiliki extention service. Kita dapat melihat contoh beberapa service seperti berikut ini
   

   [root@localhost ~]# ls /usr/lib/systemd/system | grep “d.service”
   auditd.service
   crond.service
   httpd.service
   lvm2-lvmetad.service
   lvm2-lvmpolld.service
   mcstransd.service
   nfs-rquotad.service
   rpcbind.service
   rpc-rquotad.service
   sshd.service
   systemd-hostnamed.service
   systemd-journald.service
   systemd-localed.service
   systemd-logind.service
   systemd-machined.service
   systemd-modules-load.service
   systemd-random-seed.service
   systemd-shutdownd.service
   systemd-suspend.service
   systemd-timedated.service
   systemd-udevd.service
   tcsd.service
   tuned.service
   vsftpd.service

2. Melihat isi salah satu service
   Kita akan melihat salah satu dari service seperti contoh berikut ini
   

   [root@localhost ~]# cat /usr/lib/systemd/system/httpd.service
   [Unit]
   Description=The Apache HTTP Server
   After=network.target remote-fs.target nss-lookup.target
   Documentation=man:httpd(8)
   Documentation=man:apachectl(8)

   [Service]
   Type=notify
   EnvironmentFile=/etc/sysconfig/httpd
   ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND
   ExecReload=/usr/sbin/httpd $OPTIONS -k graceful
   ExecStop=/bin/kill -WINCH ${MAINPID}
   # We want systemd to give httpd some time to finish gracefully, but still want
   # it to kill httpd after TimeoutStopSec if something went wrong during the
   # graceful stop. Normally, Systemd sends SIGTERM signal right after the
   # ExecStop, which would kill httpd. We are sending useless SIGCONT here to give
   # httpd time to finish.
   KillSignal=SIGCONT
   PrivateTmp=true

   [Install]
   WantedBy=multi-user.target

3. Melakukan manajemen dengan fullname
   Kita dapat melakukan manajemen dengan fullname seperti contoh berikut ini
   

   [root@localhost ~]# systemctl status httpd.service
   â httpd.service – The Apache HTTP Server
      Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
      Active: active (running) since Thu 2016-09-29 18:56:27 WIB; 1 day 1h ago
        Docs: man:httpd(8)
              man:apachectl(8)
    Main PID: 11581 (httpd)
      Status: “Total requests: 0; Current requests/sec: 0; Current traffic:   0 B/sec”
      CGroup: /system.slice/httpd.service
              ââ11581 /usr/sbin/httpd -DFOREGROUND
              ââ11615 /usr/sbin/httpd -DFOREGROUND
              ââ11616 /usr/sbin/httpd -DFOREGROUND
              ââ11617 /usr/sbin/httpd -DFOREGROUND
              ââ11618 /usr/sbin/httpd -DFOREGROUND
              ââ11619 /usr/sbin/httpd -DFOREGROUND

   Sep 29 18:56:27 localhost.localdomain systemd[1]: Starting The Apache HTTP Server…
   Sep 29 18:56:27 localhost.localdomain httpd[11581]: AH00558: httpd: Could not reliably determine the server’s fully qualified domain name, using localhost.l…s message
   Sep 29 18:56:27 localhost.localdomain systemd[1]: Started The Apache HTTP Server.
   Sep 29 19:01:05 localhost.localdomain httpd[11613]: AH00558: httpd: Could not reliably determine the server’s fully qualified domain name, using localhost.l…s message
   Sep 29 19:01:05 localhost.localdomain systemd[1]: Reloaded The Apache HTTP Server.
   Hint: Some lines were ellipsized, use -l to show in full.

4. Melakukan manajemen dengan nama depan
   Kita dapat melakukan manajemen memanggil nama depannya seperti contoh berikut ini:
   

   [root@localhost ~]# systemctl status httpd
   â httpd.service – The Apache HTTP Server
      Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
      Active: active (running) since Thu 2016-09-29 18:56:27 WIB; 1 day 1h ago
        Docs: man:httpd(8)
              man:apachectl(8)
    Main PID: 11581 (httpd)
      Status: “Total requests: 0; Current requests/sec: 0; Current traffic:   0 B/sec”
      CGroup: /system.slice/httpd.service
              ââ11581 /usr/sbin/httpd -DFOREGROUND
              ââ11615 /usr/sbin/httpd -DFOREGROUND
              ââ11616 /usr/sbin/httpd -DFOREGROUND
              ââ11617 /usr/sbin/httpd -DFOREGROUND
              ââ11618 /usr/sbin/httpd -DFOREGROUND
              ââ11619 /usr/sbin/httpd -DFOREGROUND

   Sep 29 18:56:27 localhost.localdomain systemd[1]: Starting The Apache HTTP Server…
   Sep 29 18:56:27 localhost.localdomain httpd[11581]: AH00558: httpd: Could not reliably determine the server’s fully qualified domain name, using localhost.l…s message
   Sep 29 18:56:27 localhost.localdomain systemd[1]: Started The Apache HTTP Server.
   Sep 29 19:01:05 localhost.localdomain httpd[11613]: AH00558: httpd: Could not reliably determine the server’s fully qualified domain name, using localhost.l…s message
   Sep 29 19:01:05 localhost.localdomain systemd[1]: Reloaded The Apache HTTP Server.
   Hint: Some lines were ellipsized, use -l to show in full.

Informasi lebih lanjut silahkan mengunjungi https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/sect-Managing_Services_with_systemd-Services.html.

Kunjungi www.proweb.co.id untuk menambah wawasan anda.