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William Turrell
2016-10-10 18:53:08 +01:00
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_posts/13-03-01-Docker.md
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@@ -7,7 +7,7 @@ anchor: docker
[Docker] is so called because it's all about containers. It's a lightweight alternative to a fully-fledged Vagrant VM. PHP's OOP is perhaps a helpful analogy to understanding it: think of Docker "images" as classes and "containers" as instances of them. For a typical LAMP application, you might have a web server container, another for the PHP-FPM process and a third for the MySQL server. Your project files - PHP, HTML, other assets, database contents – all remain on your host computer. You can create containers from the command line, or build a `docker-compose.yml` file that specifies which to use and how they communicate ("link") with one another. [Docker] is so called because it's all about containers. It's a lightweight alternative to a fully-fledged Vagrant VM. PHP's OOP is perhaps a helpful analogy to understanding it: think of Docker "images" as classes and "containers" as instances of them. For a typical LAMP application, you might have a web server container, another for the PHP-FPM process and a third for the MySQL server. Your project files - PHP, HTML, other assets, database contents – all remain on your host computer. You can create containers from the command line, or build a `docker-compose.yml` file that specifies which to use and how they communicate ("link") with one another.
Docker may help if you're developing multiple websites and want the separation that comes from installing each on it's on virtual machine, but don't have the necessary disk space or the time to keep everything up to date. It's efficient: the installation and downloads are quicker, you only need to store one copy of each image however often it's used, containers need less RAM and share the same OS kernel, so you can have more servers running simultaneously, and it takes a matter of seconds to stop and start them, no need to wait for a full server boot. Docker may help if you're developing multiple websites and want the separation that comes from installing each on it's own virtual machine, but don't have the necessary disk space or the time to keep everything up to date. It's efficient: the installation and downloads are quicker, you only need to store one copy of each image however often it's used, containers need less RAM and share the same OS kernel, so you can have more servers running simultaneously, and it takes a matter of seconds to stop and start them, no need to wait for a full server boot.
### Example: Running your PHP Applications in Docker ### Example: Running your PHP Applications in Docker
@@ -22,7 +22,7 @@ This will initialize and launch your container. `-d` makes it runs in the backgr
### Learn more about Docker ### Learn more about Docker
The command above shows a quick way to run a basic server. There's much more you can do (and thousands of pre-built images in the [Docker Hub][docker-hub].) Take time to learn the terminology and read the [Docker User Guide][docker-doc] to get the most from it, and don't run random code you've downloaded without checking it's safe – unofficial images may not have the latest security patches. If in doubt, stick to the [official repositiories][docker-hub-official]. The command above shows a quick way to run a basic server. There's much more you can do (and thousands of pre-built images in the [Docker Hub][docker-hub]). Take time to learn the terminology and read the [Docker User Guide][docker-doc] to get the most from it, and don't run random code you've downloaded without checking it's safe – unofficial images may not have the latest security patches. If in doubt, stick to the [official repositiories][docker-hub-official].
The [PHPDocker.io] site will auto-generate all the files you need for a fully-featured LAMP/LEMP stack, including your choice of PHP version and extensions. The [PHPDocker.io] site will auto-generate all the files you need for a fully-featured LAMP/LEMP stack, including your choice of PHP version and extensions.