CentOS 7にNginx 1.8をインストール（SCL）

# はじめに

Software Collection(SCL)を利用してCentOS7にNginx1.8をインストール
親記事：[Nginxの各種インストール方法とEOLまとめ](https://qiita.com/witchcraze/items/df4a0baaaad9c932ea30)
参考：[Quick Start — Software Collections](https://www.softwarecollections.org/en/docs/)

## サポート

本手法で導入した場合、[Red Hat Software Collections Product Life Cycle - Red Hat Customer Portal](https://access.redhat.com/support/policy/updates/rhscl)より、2018-11がEOLだと思われる。
それ以降に報告された脆弱性や不具合への対応は実施されない可能性がある。

## LOG

### レポジトリ登録

```shell-session
# yum install -y centos-release-scl
```

### インストール

```shell-session
# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)

# yum install -y rh-nginx18 which
# scl enable rh-nginx18 bash
... 略
```

### nginx起動/停止

```shell-session
# systemctl start rh-nginx18-nginx
# systemctl status -l rh-nginx18-nginx
● rh-nginx18-nginx.service - The nginx HTTP and reverse proxy server
   Loaded: loaded (/usr/lib/systemd/system/rh-nginx18-nginx.service; disabled; vendor preset: disabled)
   Active: active (running) since Mon 2019-10-14 14:12:03 UTC; 4s ago
  Process: 247 ExecStart=/opt/rh/rh-nginx18/root/usr/sbin/nginx (code=exited, status=0/SUCCESS)
  Process: 246 ExecStartPre=/opt/rh/rh-nginx18/root/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)
 Main PID: 248 (nginx)
   CGroup: /docker/02ec5261bfda015f3e9817c10121b773bc53984a065bf6d10c30e3e740b346c1/system.slice/rh-nginx18-nginx.service
           tq248 nginx: master process /opt/rh/rh-nginx18/root/usr/sbin/nginx
           mq249 nginx: worker process
           ? 248 nginx: master process /opt/rh/rh-nginx18/root/usr/sbin/nginx

Oct 14 14:12:03 02ec5261bfda systemd[1]: Starting The nginx HTTP and reverse proxy server...
Oct 14 14:12:03 02ec5261bfda nginx[246]: nginx: the configuration file /etc/opt/rh/rh-nginx18/nginx/nginx.conf syntax is ok
Oct 14 14:12:03 02ec5261bfda nginx[246]: nginx: configuration file /etc/opt/rh/rh-nginx18/nginx/nginx.conf test is successful
Oct 14 14:12:03 02ec5261bfda systemd[1]: Failed to read PID from file /var/opt/rh/rh-nginx18/run/nginx/nginx.pid: Invalid argument
Oct 14 14:12:03 02ec5261bfda systemd[1]: Started The nginx HTTP and reverse proxy server.
```

```shell-session
# systemctl stop rh-nginx18-nginx
# systemctl status -l rh-nginx18-nginx
● rh-nginx18-nginx.service - The nginx HTTP and reverse proxy server
   Loaded: loaded (/usr/lib/systemd/system/rh-nginx18-nginx.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

Oct 14 14:12:03 02ec5261bfda systemd[1]: Starting The nginx HTTP and reverse proxy server...
Oct 14 14:12:03 02ec5261bfda nginx[246]: nginx: the configuration file /etc/opt/rh/rh-nginx18/nginx/nginx.conf syntax is ok
Oct 14 14:12:03 02ec5261bfda nginx[246]: nginx: configuration file /etc/opt/rh/rh-nginx18/nginx/nginx.conf test is successful
Oct 14 14:12:03 02ec5261bfda systemd[1]: Failed to read PID from file /var/opt/rh/rh-nginx18/run/nginx/nginx.pid: Invalid argument
Oct 14 14:12:03 02ec5261bfda systemd[1]: Started The nginx HTTP and reverse proxy server.
Oct 14 14:12:24 02ec5261bfda systemd[1]: Stopping The nginx HTTP and reverse proxy server...
Oct 14 14:12:24 02ec5261bfda systemd[1]: Stopped The nginx HTTP and reverse proxy server.
```

### nginx自動起動設定/設定解除

```shell-session
# systemctl enable rh-nginx18-nginx
Created symlink from /etc/systemd/system/multi-user.target.wants/rh-nginx18-nginx.service to /usr/lib/systemd/system/rh-nginx18-nginx.service.

# systemctl list-unit-files --type=service |grep nginx
rh-nginx18-nginx.service               enabled
```

```shell-session
# systemctl disable rh-nginx18-nginx
Removed symlink /etc/systemd/system/multi-user.target.wants/rh-nginx18-nginx.service.

# systemctl list-unit-files --type=service |grep nginx
rh-nginx18-nginx.service               disabled
```

### 各種確認

```shell-session
# which nginx
/opt/rh/rh-nginx18/root/usr/sbin/nginx

# nginx -v
nginx version: nginx/1.8.1

# yum info rh-nginx18
Loaded plugins: fastestmirror, ovl
Loading mirror speeds from cached hostfile
 * base: ftp.iij.ad.jp
 * centos-sclo-rh: ftp.iij.ad.jp
 * centos-sclo-sclo: ftp.iij.ad.jp
 * extras: ftp.iij.ad.jp
 * updates: ftp.iij.ad.jp
Installed Packages
Name        : rh-nginx18
Arch        : x86_64
Version     : 2.1
Release     : 4.el7
Size        : 0.0
Repo        : installed
From repo   : centos-sclo-rh
Summary     : Package that installs rh-nginx18
License     : GPLv2+
Description : This is the main package for rh-nginx18 Software Collection.
```