【Docker第3回】WEBサーバを構築／ Nginxのインストール／ネットワークの概要を確認

$ sudo apt updateを実施
$ sudo apt install nginx

# 現在の設定
$ ls /var/www/html/
index.nginx-debian.html

$ cd /var/www/html/
$ cat index.nginx-debian.html

$ pwd
/var/www/html
$ sudo vi hello.html

# プロセス　実行中のプログラム
# 以下のコマンドで確認可能

$ pstree -p
systemd(1)─┬─...                                                       # systemdのプロセス
:
├─nginx(26867)─┬─nginx(26872)                                          # Nginxのプロセス
│ └─nginx(26873)
:
├─sshd(1606)───sshd(28275)───sshd(28385)───bash(28386)───pstree(28602) # SSHのプロセス
:

# Nginxのステータスを確認
# activeになっている
$ systemctl status nginx
● nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2023-02-17 23:57:04 UTC; 6h ago
:
:

# stop nginx
# inactiveになった
$ sudo systemctl stop nginx
$ systemctl status nginx
● nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
Active: inactive (dead) since Sat 2023-02-18 06:59:16 UTC; 4s ago
:
:

# 再度起動
$ ls -l /usr/sbin/nginx
-rwxr-xr-x 1 root root 1149096 Nov 10 06:38 /usr/sbin/nginx

$ sudo /usr/sbin/nginx -g 'daemon off;'
# プロンプトは返らない
# Nginxはアクティブになる
# システムDで動かした方がいい

# 再度sytemctlで Nginxを起動する
# activeになった
$ sudo systemctl start nginx
$ systemctl status nginx
● nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2023-02-18 07:10:46 UTC; 6s ago
:
:

$ curl -v localhost
* Rebuilt URL to: localhost/
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 80 (#0)
> GET / HTTP/1.1
> Host: localhost
> User-Agent: curl/7.58.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx/1.14.0 (Ubuntu)
< Date: Sat, 18 Feb 2023 09:09:35 GMT
< Content-Type: text/html
< Content-Length: 612
< Last-Modified: Fri, 17 Feb 2023 23:57:03 GMT
< Connection: keep-alive
< ETag: "63f0144f-264"
< Accept-Ranges: bytes
<
:
:
:
* Connection #0 to host localhost left intact

$ telnet localhost 80
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GET / HTTP/1.1
Host: localhost
User-Agent: curl/7.58.0
Accept: */*
:
:
# 同様にレスポンスがあることを確認
# Ctrl + C で抜ける