はじめに

ngin.xに接続を試みるもエラーとなりました。

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

対処法

エラーコードの指示を実行。

$ systemctl status nginx.service
● nginx.service - nginx - high performance web server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since 火 2019-09-17 20:53:03 UTC; 25s ago
     Docs: http://nginx.org/en/docs/
  Process: 3438 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=1/FAILURE)

 9月 17 20:53:03 ip-10-0-0-133.ap-northeast-1.compute.internal systemd[1]: Starting nginx - high performance web server...
 9月 17 20:53:03 ip-10-0-0-133.ap-northeast-1.compute.internal nginx[3438]: nginx: [emerg] unknown directive "　" in /etc/nginx/nginx.conf:44
 9月 17 20:53:03 ip-10-0-0-133.ap-northeast-1.compute.internal systemd[1]: nginx.service: control process exited, code=exited status=1
 9月 17 20:53:03 ip-10-0-0-133.ap-northeast-1.compute.internal systemd[1]: Failed to start nginx - high performance web server.
 9月 17 20:53:03 ip-10-0-0-133.ap-northeast-1.compute.internal systemd[1]: Unit nginx.service entered failed state.
 9月 17 20:53:03 ip-10-0-0-133.ap-northeast-1.compute.internal systemd[1]: nginx.service failed.

不要な空白" "が入ってしまって、そんな指令知らないと怒られていました。それが/etc/nginx/nginx.conf:44にあるとのこと。

$ sudo vi /etc/nginx/nginx.conf
  :set number  #４４行目を探すため、行数表示
　不要な空白を削除。おそらく全角の空白があった。

最初、行数数えていましたので(笑)、:set numberは便利ですね。カーソルモード(ESCを押したあとの状態)で入力です。

再度接続すると、無事接続できました。

$ sudo systemctl start nginx.service
$ sudo systemctl status nginx.service  #接続状況の確認
● nginx.service - nginx - high performance web server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; vendor preset: disabled)
   Active: active (running) since 火 2019-09-17 21:32:13 UTC; 3min 56s ago
     Docs: http://nginx.org/en/docs/
  Process: 3592 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=0/SUCCESS)
 Main PID: 3593 (nginx)
   CGroup: /system.slice/nginx.service
           ├─3593 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
           └─3595 nginx: worker process

 9月 17 21:32:13 ip-10-0-0-133.ap-northeast-1.compute.internal systemd[1]: Starting nginx - high performance web server...
 9月 17 21:32:13 ip-10-0-0-133.ap-northeast-1.compute.internal systemd[1]: PID file /var/run/nginx.pid not readable (yet?) after start.
 9月 17 21:32:13 ip-10-0-0-133.ap-northeast-1.compute.internal systemd[1]: Started nginx - high performance web server.

参考