Ubuntu20.04+Apacheのインストールエラー対策

この記事のポイント

・Invalid command 'RewriteEngine' は sudo a2enmod rewrite で解消できる
・Invalid command 'SSLEngine' は sudo a2enmod ssl で解消できる
・Invalid command 'Header' は sudo a2enmod headers で解消できる
・モジュール有効化後は systemctl restart apache2 で設定を反映する

Jan 19 03:14:28 linuxmaster-01 apachectl[2433]: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included in the server configuration

$ sudo a2enmod rewrite
Enabling module rewrite.
To activate the new configuration, you need to run:
  systemctl restart apache2

# after enabling, verify with: apache2ctl -M | grep rewrite
$ sudo systemctl restart apache2
$ apache2ctl -M | grep rewrite
 rewrite_module (shared)

# /etc/apache2/sites-available/000-default.conf の設定例
<Directory /var/www/html>
    AllowOverride All
    Require all granted
</Directory>

Jan 19 03:15:25 linuxmaster-01 apachectl[2485]: Invalid command 'SSLEngine', perhaps misspelled or defined by a module not included in the server configuration

$ sudo a2enmod ssl
Considering dependency setenvif for ssl:
Module setenvif already enabled
Considering dependency mime for ssl:
Module mime already enabled
Considering dependency socache_shmcb for ssl:
Enabling module socache_shmcb.
Enabling module ssl.
See /usr/share/doc/apache2/README.Debian.gz on how to configure SSL and create
self-signed certificates.
To activate the new configuration, you need to run:
  systemctl restart apache2

$ sudo systemctl restart apache2

Jan 19 03:18:15 linuxmaster-01 apachectl[2599]: Invalid command 'Header', perhaps misspelled or defined by a module not included in the server configuration

$ sudo a2enmod headers
Enabling module headers.
To activate the new configuration, you need to run:
  systemctl restart apache2

$ sudo systemctl restart apache2

# セキュリティヘッダーの追加例（/etc/apache2/sites-available/000-default.conf等）
Header always set X-Frame-Options "SAMEORIGIN"
Header always set X-Content-Type-Options "nosniff"
Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains"

$ apache2ctl -M
Loaded Modules:
 core_module (static)
 so_module (static)
 ...
 rewrite_module (shared)
 ssl_module (shared)
 headers_module (shared)