Hatayı görmek lazım. hatayı aldıktan sonra" journalctl -xe" komutu ne sonuç veriyor?
-- Unit nginx.service has begun starting up.
Feb 06 15:19:45 localhost.localdomain nginx[13992]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Feb 06 15:19:45 localhost.localdomain sshd[13983]: Failed password for root from 112.85.42.81 port 30655 ssh2
Feb 06 15:19:45 localhost.localdomain unix_chkpwd[13993]: password check failed for user (root)
Feb 06 15:19:45 localhost.localdomain sshd[13983]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
Feb 06 15:19:45 localhost.localdomain named[1110]: client @0x7f02800c6370 45.4.52.92#80 (higi.com): query (cache) 'higi.com/ANY/IN' denied
Feb 06 15:19:45 localhost.localdomain nginx[13992]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Feb 06 15:19:46 localhost.localdomain nginx[13992]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Feb 06 15:19:46 localhost.localdomain nginx[13992]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Feb 06 15:19:46 localhost.localdomain named[1110]: client @0x7f02800c6370 45.4.52.92#80 (higi.com): query (cache) 'higi.com/ANY/IN' denied
Feb 06 15:19:47 localhost.localdomain nginx[13992]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Feb 06 15:19:47 localhost.localdomain sshd[13983]: Failed password for root from 112.85.42.81 port 30655 ssh2
Feb 06 15:19:47 localhost.localdomain unix_chkpwd[13994]: password check failed for user (root)
Feb 06 15:19:47 localhost.localdomain sshd[13983]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
Feb 06 15:19:47 localhost.localdomain nginx[13992]: nginx: [emerg] still could not bind()
Feb 06 15:19:47 localhost.localdomain systemd[1]: nginx.service: control process exited, code=exited status=1
Feb 06 15:19:47 localhost.localdomain systemd[1]: Failed to start nginx - high performance web server.
-- Subject: Unit nginx.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit nginx.service has failed.
--
-- The result is failed.
Feb 06 15:19:47 localhost.localdomain systemd[1]: Unit nginx.service entered failed state.
Feb 06 15:19:47 localhost.localdomain systemd[1]: nginx.service failed.