Docker for Developers - Sunshine PHP
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The document provides an overview of Docker, a platform that allows developers and sysadmins to build, ship, and run distributed applications using containers. It explains Docker's architecture, including its engine, networking capabilities, and how to use Docker commands for running and managing containers. The content also discusses best practices, such as using volumes for persistent data and leveraging Docker Compose for multi-container orchestration.
![Running a container
• `docker run` will run a container
• This will not restart an existing container, just create a new one
• docker run [options] IMAGE [command] [arguments]
• [options ]modify the docker process for this container
• IMAGE is the image to use
• [command] is the command to run inside the container
• [arguments] are arguments for the command
Sunshine PHP 2017 13](https://image.slidesharecdn.com/dockerfordevelopers-workshopsunshinephp2017-170203165227/85/Docker-for-Developers-Sunshine-PHP-13-320.jpg)
![Some Notes
• All three containers are 100% self contained
• Docker containers share common ancestors, but keep their own files
• `docker run` parameters:
• --rm – Destroy a container once it exits
• -d – Run in the background (daemon mode)
• -i – Run in interactive mode
• --name – Give the container a name
• -p [local port]:[container port] – Forward the local port to the container port
Sunshine PHP 2017 26](https://image.slidesharecdn.com/dockerfordevelopers-workshopsunshinephp2017-170203165227/85/Docker-for-Developers-Sunshine-PHP-26-320.jpg)
![Inspect a container
docker inspect [options] CONTAINER_NAME
• Returns a JSON string with data about the container
• Can also query
• docker inspect -f “{{ .NetworkSettings.IPAddress }}” web_server
• Really handy for scripting out things like reverse proxies
Sunshine PHP 2017 55](https://image.slidesharecdn.com/dockerfordevelopers-workshopsunshinephp2017-170203165227/85/Docker-for-Developers-Sunshine-PHP-55-320.jpg)
![Config for DB now points to the service
name
Sunshine PHP 2017 86
<?php
return [
'debug' => true,
'config_cache_enabled' => false,
'db' => [
'driver' => 'Pdo_Mysql',
'hostname' => 'mysqlserver',
'port' => '3306',
'database' => 'dockerfordevs',
'user' => 'root',
'password' => 's3curep@assword',
],
];](https://image.slidesharecdn.com/dockerfordevelopers-workshopsunshinephp2017-170203165227/85/Docker-for-Developers-Sunshine-PHP-86-320.jpg)
Docker for Developers - Sunshine PHP
- 1. Docker for PHP Developers Chris Tankersley @dragonmantank Sunshine PHP 2017 Sunshine PHP 2017 1
- 2. What Is Docker? “Docker is an open platform for developers and sysadmins to build, ship, and run distributed applications. Consisting of Docker Engine, a portable, lightweight runtime and packaging tool, and Docker Hub, a cloud service for sharing applications and automating workflows, Docker enables apps to be quickly assembled from components and eliminates the friction between development, QA, and production environments.” Sunshine PHP 2017 2 https://www.docker.com/whatisdocker/
- 4. Normal Bare-Metal Server Sunshine PHP 2017 4 CPU RAM HD Network Operating System nginx PHP DB
- 5. Virtual Machines Sunshine PHP 2017 5 CPU RAM HD Network Operating System nginx PHP DB Operating System nginx PHP DB Operating System Hypervisor
- 6. Containers Sunshine PHP 2017 6 CPU RAM HD Network Operating System nginxnginx PHP DB PHP DB
- 7. Containers Are Not New • LXC (Linux Containers) • OpenVZ • Systemd-nspawn • Qemu/kvm • BSD Jails • Solaris Zones • chroot Sunshine PHP 2017 7
- 8. Docker is an Ecosystem Sunshine PHP 2017 8 Docker Engine
- 9. Docker is an Ecosystem Sunshine PHP 2017 9 Docker ComposeDocker Machine Docker Swarm
- 10. How does it work? Sunshine PHP 2017 10 Uses a variety of existing Container technologies Server Containers Hyper-V Containers xhyve Virtualization
- 11. Sorry OSX < 10.10 and Windows < 10 Users Docker Toolbox Sunshine PHP 2017 11
- 12. Let’s use Docker Sunshine PHP 2017 12
- 13. Running a container • `docker run` will run a container • This will not restart an existing container, just create a new one • docker run [options] IMAGE [command] [arguments] • [options ]modify the docker process for this container • IMAGE is the image to use • [command] is the command to run inside the container • [arguments] are arguments for the command Sunshine PHP 2017 13
- 14. Running a simple shell Sunshine PHP 2017 14
- 15. Running a simple shell Sunshine PHP 2017 15
- 16. Running a simple shell Sunshine PHP 2017 16
- 17. What’s Going On? Sunshine PHP 2017 17 Ubuntu Kernel / + bin/ + etc/ + dev/ + home/ + usr/ + var/ + lib/ + … nginx bash / + bin/ + etc/ + dev/ + home/ + usr/ + var/ + lib/ + … php
- 18. Running Two Webservers Sunshine PHP 2017 18
- 19. Running Two Webservers Sunshine PHP 2017 19
- 20. Running Two Webservers Sunshine PHP 2017 20
- 21. Running Two Webservers Sunshine PHP 2017 21
- 22. Running Two Webservers Sunshine PHP 2017 22
- 23. Running Two Webservers Sunshine PHP 2017 23
- 24. Running Two Webservers Sunshine PHP 2017 24
- 25. Running Two Webservers Sunshine PHP 2017 25
- 26. Some Notes • All three containers are 100% self contained • Docker containers share common ancestors, but keep their own files • `docker run` parameters: • --rm – Destroy a container once it exits • -d – Run in the background (daemon mode) • -i – Run in interactive mode • --name – Give the container a name • -p [local port]:[container port] – Forward the local port to the container port Sunshine PHP 2017 26
- 27. Volumes Sunshine PHP 2017 27
- 28. Modifying a running container • `docker exec` can run a command inside of an existing container • Use Volumes to share data Sunshine PHP 2017 28
- 29. Persistent Data with Volumes • You can designate a volume with –v • Create a named volume with `volume create` • Volumes can be shared amongst containers • Volumes can mount data from the host system Sunshine PHP 2017 29
- 30. Mounting from the host machine Sunshine PHP 2017 30
- 31. Mounting from the host machine Sunshine PHP 2017 31
- 32. Mounting from the host machine Sunshine PHP 2017 32
- 33. Mounting from the host machine Sunshine PHP 2017 33
- 34. Mounting from the host machine Sunshine PHP 2017 34
- 35. Mounting from the host isn’t perfect • The container now has a window into your host machine • Permissions can get screwy if you are modifying in the container • Most things it creates will be root by default, and you probably aren’t root on the host machine • Host-mounted volumes are not portable at all • OSX and Hyper-V VMs have limited pathings to mount • OSX has poor I/O performance Sunshine PHP 2017 35
- 36. Named Data Volumes • Creates a space that becomes persistent • Can be mounted anywhere inside your images • Have our app containers use the data volume to store data • Use ‘editor containers’ to go in and modify data when needed Sunshine PHP 2017 36
- 37. vim Tutorial • vim is a Modal text editor • ESC will drop you back to default mode • :new /opt/webconfig/default to create a new file • In default mode, i will get us into interactive (edit) mode • :w to save a file • :q will quit Sunshine PHP 2017 37
- 38. Mounting Data Volumes Sunshine PHP 2017 38
- 39. Mounting Data Volumes Sunshine PHP 2017 39
- 40. Mounting Data Volumes Sunshine PHP 2017 40
- 41. Mounting Data Volumes Sunshine PHP 2017 41
- 42. Mounting Data Volumes Sunshine PHP 2017 42
- 43. Mounting Data Volumes Sunshine PHP 2017 43
- 44. Why go through the hassle? • Data volumes are portable, depending on the driver • Data volumes are safer • Separates the app containers from data • Production can use a data volume, dev can use a host volume • Our app containers stay small • Works directly with other tools Sunshine PHP 2017 44
- 45. Networking Sunshine PHP 2017 45
- 46. Networking • Docker can create multiple network “pools” • Each container gets an IP address • Containers can be attached to multiple networks • Docker network allow service discovery inside networks Sunshine PHP 2017 46
- 47. Legacy - Docker Links • Legacy Links work with `--link` • Only works on the legacy “bridge” network • Doesn’t support service discovery • Not worth it to use anymore Sunshine PHP 2017 47
- 48. Docker Networks • Discreet IP pool for containers • Containers can be added and removed to the network at whim • Service discovery though ‘--network-alias’ • Can be set up to work across hosts Sunshine PHP 2017 48
- 49. Create a network Sunshine PHP 2017 49
- 50. Attach to a network Sunshine PHP 2017 50
- 51. Ping the web container Sunshine PHP 2017 51
- 52. Add another web and kill web1 Sunshine PHP 2017 52
- 53. BREAK TIME! WOO! Sunshine PHP 2017 53
- 54. Other Helpful Commands Sunshine PHP 2017 54
- 55. Inspect a container docker inspect [options] CONTAINER_NAME • Returns a JSON string with data about the container • Can also query • docker inspect -f “{{ .NetworkSettings.IPAddress }}” web_server • Really handy for scripting out things like reverse proxies Sunshine PHP 2017 55
- 56. Work with images • docker pull IMAGE – Pulls down an image before using • docker images – Lists all the images that are downloaded • docker rmi IMAGE – Deletes an image if it’s not being used Sunshine PHP 2017 56
- 57. Containerizing An Application Sunshine PHP 2017 57
- 58. Our Goals • Not change our workflow (much) • Run PHP 7, Unit Tests, and webserver • Deploy “easily” Sunshine PHP 2017 58
- 59. Just try and run it docker run -d --name d4dapp -v C:dragoProjectsdockerfordevs-app:/var/www/ -p 8080:80 php:apache Sunshine PHP 2017 59
- 60. Sunshine PHP 2017 60
- 61. Checking Logs • Containers log to stdout/stderr • Docker aggregates the logs • Can be viewed with docker logs Sunshine PHP 2017 61
- 62. Oops Sunshine PHP 2017 62
- 63. Custom Images • PHP images are pretty bare • Lots of times need to install extensions Sunshine PHP 2017 63
- 64. Dockerfile • Dockerfile is the configuration steps for an image • Can be created from scratch, or based on another image • Allows you to add files, create default volumes, ports, etc • Can be used privately or pushed to Docker Hub Sunshine PHP 2017 64
- 65. docker/Dockerfile FROM php:apache RUN a2enmod rewrite Sunshine PHP 2017 65
- 66. Build it docker build -t tag_name ./ • This runs through the Dockerfile and generates the image • We can now use the tag name to run the image Sunshine PHP 2017 66
- 67. Build it docker build -t d4dapp docker/ Sunshine PHP 2017 67
- 68. Sunshine PHP 2017 68
- 69. Use the new image docker run -d --name d4dapp -v C:dragoProjectsdockerfordevs-app:/var/www/ -p 8080:80 d4dapp Sunshine PHP 2017 69
- 70. Use the new image Sunshine PHP 2017 70
- 71. Slightly better Sunshine PHP 2017 71
- 72. Install Dependencies Sunshine PHP 2017 72
- 73. Running Composer docker run --rm -v c:/Users/drago/.composer:/root/.composer -v c:/Users/drago/Projects/workshop:/app -v c:/Users/drago/.ssh:/root/.ssh composer/composer install Sunshine PHP 2017 73
- 74. Better! Sunshine PHP 2017 74
- 75. Look at queues! Sunshine PHP 2017 75
- 76. docker/Dockerfile FROM php:apache RUN a2enmod rewrite && docker-php-ext-install pdo_mysql Sunshine PHP 2017 76
- 77. Rebuild it docker build -t d4dapp docker/ Sunshine PHP 2017 77
- 78. Rebuild the image docker build -t d4dapp docker/ Sunshine PHP 2017 78
- 79. Rebuild the container $ docker rm -f d4dapp $ docker run -d --name d4dapp -v C:dragoProjectsdockerfordevs-app:/var/www/ -p 8080:80 d4dapp Sunshine PHP 2017 79
- 80. Progress! Sunshine PHP 2017 80
- 81. Docker Compose Sunshine PHP 2017 81
- 82. What is Docker Compose? • Multi-container orchestration • A single config file holds all of your container info • Works with Docker Swarm and a few other tools, like Rancher Sunshine PHP 2017 82
- 83. Sample docker-compose.yml version: '2' volumes: mysqldata: driver: local services: d4dapp: build: ./docker/ volumes: - ./:/var/www/ ports: - 8080:80 mysqlserver: image: mysql environment: MYSQL_DATABASE: dockerfordevs MYSQL_ROOT_PASSWORD: 's3curep@assword' volumes: - mysqldata:/var/lib/mysql Sunshine PHP 2017 83
- 84. No longer use docker run $ docker rm –f d4dapp $ docker-compose up -d Sunshine PHP 2017 84
- 85. Now we have 2 containers Sunshine PHP 2017 85
- 86. Config for DB now points to the service name Sunshine PHP 2017 86 <?php return [ 'debug' => true, 'config_cache_enabled' => false, 'db' => [ 'driver' => 'Pdo_Mysql', 'hostname' => 'mysqlserver', 'port' => '3306', 'database' => 'dockerfordevs', 'user' => 'root', 'password' => 's3curep@assword', ], ];
- 87. Yay! Sunshine PHP 2017 87
- 88. Install our DB Migration Software docker run --rm -v c:/Users/drago/.composer:/root/.composer -v c:/Users/drago/Projects/workshop:/app -v c:/Users/drago/.ssh:/root/.ssh composer/composer require robmorgan/phinx Sunshine PHP 2017 88
- 89. Set up phinx docker run --rm -v C:UsersdragoProjectsdockerfordevs-app:/app -w /app php:cli php vendor/bin/phinx init Sunshine PHP 2017 89
- 90. Run the migration docker run --rm -v C:UsersdragoProjectsdockerfordevs-app:/app -w /app --network dockerfordevsapp_default php:cli php vendor/bin/phinx migrate Sunshine PHP 2017 90
- 91. Oops Sunshine PHP 2017 91
- 92. Let’s use the existing container docker run --rm -v C:UsersdragoProjectsdockerfordevs-app:/app -w /app --network dockerfordevsapp_default dockerfordevsapp_d4dapp php vendor/bin/phinx migrate Sunshine PHP 2017 92
- 93. Good… Sunshine PHP 2017 93
- 94. It Lives! Sunshine PHP 2017 94
- 95. Other Tools Sunshine PHP 2017 95
- 96. Docker Ecosystem • Docker Machine • Docker Swarm Sunshine PHP 2017 96
- 97. Thank You! • Software Engineer for InQuest • Author of “Docker for Developers” • https://leanpub.com/dockerfordevs • Co-Host of “Jerks Talk Games” • http://jerkstalkgames • http://ctankersley.com • [email protected] • @dragonmantank Sunshine PHP 2017 97