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Performance optimized PHP-FPM container image

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Performance optimized PHP-FPM container image

Alpine-based performance optimized build of PHP-FPM for containerized production environments.

  • Arguments provided to docker are passed to FPM, e.g. docker run <image> -d zend_extension=xdebug.so -i.
  • Execute PHP's cli via docker exec -it <instance> php.
  • Extend PHP's settings by adding .ini files to /etc/php/conf.d.
  • Extend FPM pool's settings by adding .conf files to /etc/php-fpm.d.
  • Extend/override Apache settings via /etc/apache2/conf.d/app.conf.
  • Hook entry script by adding /usr/local/bin/entry-config.sh and /usr/local/bin/entry-run.sh
  • REMOTE_ADDR and REQUEST_SCHEME HTTP headers are populated from X_FORWARDED_FOR and X_FORWARDED_PROTO, respectively.
  • The HTTPS HTTP header is set to on for every request having X_FORWARDED_PROTO == 'https'.
  • SSH access can be enabled by installing dropbear (apk add --no-cache dropbear) and setting root's pubkey using the appropriate environment variable (see below).
  • Apache fcgi_proxy (connect) timeout is set to 300s

Environment variables

NAME DEFAULT DESCRIPTION
HOST default gateway Host address
HTTPD_PORT 80
HTTPD_ROOT /var/www/app
HTTPD_SERVERNAME $HOSTNAME or localhost
HTTPD_REALIP_HEADER X-Forwarded-For
SSHD_PORT 22 if dropbear is installed
SSHD_AUTH_PUBKEY if dropbear is installed

Bundled extensions

The following extensions are included and enabled by default:

  • GD with support for PNG, JPEG and WebP
  • BCMath, GMP
  • OpenSSL, Sodium, Argon2
  • PDO PostgreSQL/MySQL, MySQLi
  • OPcache, APCu

Additional extensions are available but disabled by default:

  • PhpRedis (-dextension=redis.so)
  • AMQP (-dextension=amqp.so)
  • Xdebug (-dzend_extension=xdebug.so)

Notes

  • docker build -f Containerfile.81 --target builder --tag builder-81 . builds the intermediary builder image.
  • Build flags courtesy of ClearLinux's PHP package

TODO

  • include msmtp for sending emails

References

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