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<a data-link href="/docker/installation/rhel/" class=""> Installation on Red Hat Enterprise Linux</a>
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<a data-link href="/docker/userguide/dockerimages/" class=""> Get started with images</a>
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<a data-link href="/docker/userguide/dockerrepos/" class=""> Get started with Docker Hub</a>
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<a data-link href="/articles/basics/" class=""> Get started with containers</a>
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<a data-link href="/docker/userguide/usingdocker/" class=""> Working with containers</a>
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<a data-link href="/docker/userguide/dockervolumes/" class=""> Managing data in containers</a>
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<a data-link href="/docker/userguide/dockerlinks/" class=""> Linking containers together</a>
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<a data-link href="/articles/host_integration/" class=""> Automatically start containers</a>
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</article>
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<article data-accordion>
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<button data-control> Docker on Windows & OSX</button>
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<div data-content>
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<a data-link href="/articles/dsc/" class=""> PowerShell DSC Usage</a>
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<a data-link href="/articles/b2d_volume_resize/" class=""> Resizing a Boot2Docker volume </a>
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</div>
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</article>
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<article data-accordion>
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<button data-control> Use the Kitematic GUI</button>
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<a data-link href="/kitematic/userguide/" class=""> Kitematic User Guide: Intro & Overview</a>
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<a data-link href="/kitematic/nginx-web-server/" class=""> Set up an Nginx web server</a>
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<a data-link href="/kitematic/minecraft-server/" class=""> Set up a Minecraft Server</a>
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<a data-link href="/kitematic/rethinkdb-dev-database/" class=""> Creating a Local RethinkDB Database for Development</a>
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<a data-link href="/kitematic/faq/" class=""> Frequently Asked Questions</a>
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<a data-link href="/kitematic/known-issues/" class=""> Known Issues</a>
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</div>
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</article>
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</div>
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</article>
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</section>
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<section data-accordion>
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<article data-accordion>
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<button data-control> Use Docker</button>
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<div data-content>
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<a data-link href="/docker/misc/" class=""> About Docker</a>
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<a data-link href="/docker/userguide/labels-custom-metadata/" class=""> Apply custom metadata</a>
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<a data-link href="/docker/introduction/understanding-docker/" class=""> Understand the architecture</a>
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<article data-accordion>
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<button data-control> Provision & set up Docker hosts</button>
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<div data-content>
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<a data-link href="/machine/" class=""> Overview of Docker Machine</a>
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</div>
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</article>
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<article data-accordion>
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<button data-control> Create multi-container applications</button>
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<div data-content>
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<a data-link href="/compose/" class=""> Overview of Docker Compose</a>
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<a data-link href="/compose/production/" class=""> Using Compose in production</a>
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<a data-link href="/compose/extends/" class=""> Extending services in Compose</a>
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<a data-link href="/compose/completion/" class=""> Command Completion</a>
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<a data-link href="/compose/django/" class=""> Quickstart Guide: Compose and Django</a>
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<a data-link href="/compose/rails/" class=""> Quickstart Guide: Compose and Rails</a>
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<a data-link href="/compose/wordpress/" class=""> Quickstart Guide: Compose and Wordpress</a>
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</div>
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</article>
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<article data-accordion>
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<button data-control> Cluster Docker containers</button>
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<div data-content>
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<a data-link href="/swarm/" class=""> Docker Swarm</a>
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<a data-link href="/swarm/install-manual/" class=""> Create a swarm for development</a>
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<a data-link href="/swarm/discovery/" class=""> Docker Swarm discovery</a>
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<a data-link href="/swarm/scheduler/filter/" class=""> Docker Swarm filters</a>
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<a data-link href="/swarm/scheduler/strategy/" class=""> Docker Swarm strategies</a>
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</div>
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</article>
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<article data-accordion>
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<button data-control> Adminstrate Docker</button>
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<div data-content>
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<a data-link href="/articles/networking/" class=""> Network configuration</a>
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<a data-link href="/articles/security/" class=""> Docker security</a>
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<a data-link href="/articles/configuring/" class=""> Configuring and running Docker</a>
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<a data-link href="/articles/runmetrics/" class=""> Runtime metrics</a>
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<a data-link href="/articles/https/" class=""> Protect the Docker daemon socket</a>
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<a data-link href="/articles/ambassador_pattern_linking/" class=""> Link via an ambassador container</a>
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<a data-link href="/articles/systemd/" class=""> Control and configure Docker with systemd</a>
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<article data-accordion>
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<button data-control> Applications and Services</button>
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<div data-content>
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<a data-link href="/docker/examples/running_riak_service/" class=""> Dockerizing a Riak service</a>
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<a data-link href="/docker/examples/running_ssh_service/" class=""> Dockerizing an SSH service</a>
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</div>
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</article>
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<article data-accordion>
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<button data-control> Integrate with Third-party Tools</button>
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<div data-content>
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<a data-link href="/articles/cfengine_process_management/" class=" active"> Process management with CFEngine</a>
|
|
|
|
<a data-link href="/articles/chef/" class=""> Using Chef</a>
|
|
|
|
<a data-link href="/articles/puppet/" class=""> Using Puppet</a>
|
|
|
|
<a data-link href="/articles/using_supervisord/" class=""> Using Supervisor with Docker</a>
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</div>
|
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</article>
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</div>
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</article>
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<article data-accordion>
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<button data-control> Applied Docker</button>
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<div data-content>
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<a data-link href="/docker/examples/mongodb/" class=""> Dockerizing MongoDB</a>
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<a data-link href="/docker/examples/postgresql_service/" class=""> Dockerizing PostgreSQL</a>
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<a data-link href="/docker/examples/couchdb_data_volumes/" class=""> Dockerizing a CouchDB service</a>
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<a data-link href="/docker/examples/nodejs_web_app/" class=""> Dockerizing a Node.js web app</a>
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<a data-link href="/docker/examples/running_redis_service/" class=""> Dockerizing a Redis service</a>
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<a data-link href="/docker/examples/apt-cacher-ng/" class=""> Dockerizing an apt-cacher-ng service</a>
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<a data-link href="/docker/userguide/dockerizing/" class=""> Dockerizing applications: A 'Hello world'</a>
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</div>
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</article>
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</div>
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</article>
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</section>
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<section data-accordion>
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<article data-accordion>
|
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<button data-control> Manage image repositories</button>
|
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<div data-content>
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<article data-accordion>
|
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<button data-control> The Public Hub</button>
|
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<div data-content>
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<a data-link href="/docker/docker-hub/userguide/" class=""> Docker Hub user guide</a>
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<a data-link href="/docker/docker-hub/" class=""> The Docker Hub</a>
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<a data-link href="/docker/docker-hub/accounts/" class=""> Accounts on Docker Hub</a>
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<a data-link href="/docker/userguide/dockerhub/" class=""> Getting started with Docker Hub</a>
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<a data-link href="/docker/docker-hub/repos/" class=""> Your Repositories on Docker Hub</a>
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<a data-link href="/docker/docker-hub/builds/" class=""> Automated Builds on Docker Hub</a>
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<a data-link href="/docker/docker-hub/official_repos/" class=""> Official Repositories on Docker Hub</a>
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</div>
|
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</article>
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<article data-accordion>
|
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<button data-control> Docker Trusted Registry</button>
|
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<div data-content>
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|
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<a data-link href="/docker-trusted-registry/" class=""> Overview</a>
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<a data-link href="/docker-trusted-registry/quick-start/" class=""> Quick-start: Basic Workflow</a>
|
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<a data-link href="/docker-trusted-registry/userguide/" class=""> User guide</a>
|
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<a data-link href="/docker-trusted-registry/adminguide/" class=""> Admin guide</a>
|
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|
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<a data-link href="/docker-trusted-registry/install/" class=""> Installation</a>
|
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|
|
<a data-link href="/docker-trusted-registry/configuration/" class=""> Configuration options</a>
|
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|
|
<a data-link href="/docker-trusted-registry/support/" class=""> Support</a>
|
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|
|
<a data-link href="/docker-trusted-registry/release-notes/" class=""> Release notes</a>
|
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|
|
<a data-link href="/docker-trusted-registry/prior-release-notes/" class=""> Prior release notes archive</a>
|
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|
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</div>
|
|
</article>
|
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<article data-accordion>
|
|
<button data-control> Docker Registry</button>
|
|
<div data-content>
|
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|
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<a data-link href="/registry/" class=""> Docker Registry 2.0</a>
|
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|
|
<a data-link href="/registry/introduction/" class=""> Understanding the Registry</a>
|
|
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|
|
<a data-link href="/registry/deploying/" class=""> Deploying a registry server</a>
|
|
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|
|
<a data-link href="/registry/configuration/" class=""> Configure a Registry</a>
|
|
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|
|
<a data-link href="/registry/notifications/" class=""> Work with Notifications</a>
|
|
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|
|
<a data-link href="/registry/authentication/" class=""> Authentication for the Registry</a>
|
|
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|
|
|
|
|
|
<a data-link href="/registry/help/" class=""> Getting help</a>
|
|
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
|
|
|
|
<a data-link href="/articles/certificates/" class=""> Using certificates for repository client verification</a>
|
|
|
|
|
|
|
|
<a data-link href="/articles/registry_mirror/" class=""> Run a local registry mirror</a>
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
</section>
|
|
|
|
<section data-accordion>
|
|
|
|
<article data-accordion>
|
|
<button data-control> Command and API references</button>
|
|
<div data-content>
|
|
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|
|
<article data-accordion>
|
|
<button data-control> Command line reference</button>
|
|
<div data-content>
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/cli/" class=""> Using the command line</a>
|
|
|
|
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|
|
|
|
|
<a data-link href="/docker/reference/commandline/daemon/" class=""> daemon</a>
|
|
|
|
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|
|
|
|
<a data-link href="/docker/reference/commandline/attach/" class=""> attach</a>
|
|
|
|
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|
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|
|
<a data-link href="/docker/reference/commandline/build/" class=""> build</a>
|
|
|
|
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|
|
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|
|
<a data-link href="/docker/reference/commandline/commit/" class=""> commit</a>
|
|
|
|
|
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|
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|
|
<a data-link href="/docker/reference/commandline/cp/" class=""> cp</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/create/" class=""> create</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/diff/" class=""> diff</a>
|
|
|
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|
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|
|
<a data-link href="/docker/reference/commandline/events/" class=""> events</a>
|
|
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|
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|
|
|
|
|
<a data-link href="/docker/reference/commandline/exec/" class=""> exec</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/export/" class=""> export</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/history/" class=""> history</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/images/" class=""> images</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/import/" class=""> import</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/info/" class=""> info</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/inspect/" class=""> inspect</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/kill/" class=""> kill</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/load/" class=""> load</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/login/" class=""> login</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/logout/" class=""> logout</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/logs/" class=""> logs</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/pause/" class=""> pause</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/port/" class=""> port</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/ps/" class=""> ps</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/pull/" class=""> pull</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/push/" class=""> push</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/rename/" class=""> rename</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/restart/" class=""> restart</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/rm/" class=""> rm</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/rmi/" class=""> rmi</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/run/" class=""> run</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/save/" class=""> save</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/search/" class=""> search</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/start/" class=""> start</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/stats/" class=""> stats</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/stop/" class=""> stop</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/tag/" class=""> tag</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/top/" class=""> top</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/unpause/" class=""> unpause</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/version/" class=""> version</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/commandline/wait/" class=""> wait</a>
|
|
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/run/" class=""> Docker run reference</a>
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/builder/" class=""> Dockerfile reference</a>
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/api/remote_api_client_libraries/" class=""> Remote API client libraries</a>
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/api/docker_io_accounts_api/" class=""> docker.io accounts API</a>
|
|
|
|
|
|
|
|
<article data-accordion>
|
|
<button data-control> Docker Remote API</button>
|
|
<div data-content>
|
|
|
|
|
|
<a data-link href="/docker/reference/api/docker-io_api/" class=""> Docker Hub API</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/api/docker_remote_api/" class=""> Remote API</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/api/docker_remote_api_v1.19/" class=""> Remote API v1.19</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/api/docker_remote_api_v1.18/" class=""> Remote API v1.18</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/api/docker_remote_api_v1.17/" class=""> Remote API v1.17</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/api/docker_remote_api_v1.16/" class=""> Remote API v1.16</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/api/docker_remote_api_v1.15/" class=""> Remote API v1.15</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/reference/api/docker_remote_api_v1.14/" class=""> Remote API v1.14</a>
|
|
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
|
|
|
|
<article data-accordion>
|
|
<button data-control> Docker Hub</button>
|
|
<div data-content>
|
|
|
|
|
|
<a data-link href="/docker/reference/api/hub_registry_spec/" class=""> The Docker Hub and the Registry v1</a>
|
|
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
|
|
|
|
<article data-accordion>
|
|
<button data-control> Docker Compose Reference</button>
|
|
<div data-content>
|
|
|
|
|
|
<a data-link href="/compose/cli/" class=""> Compose CLI reference</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/compose/yml/" class=""> docker-compose.yml reference</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/compose/env/" class=""> Compose environment variables reference</a>
|
|
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
|
|
|
|
<a data-link href="" class=""> Docker Machine Reference</a>
|
|
|
|
|
|
|
|
<article data-accordion>
|
|
<button data-control> Docker Swarm Reference</button>
|
|
<div data-content>
|
|
|
|
|
|
<a data-link href="/swarm/api/swarm-api/" class=""> Docker Swarm API</a>
|
|
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
|
|
|
|
<article data-accordion>
|
|
<button data-control> Docker Registry Reference</button>
|
|
<div data-content>
|
|
|
|
|
|
<a data-link href="/registry/spec/api/" class=""> Docker Registry HTTP API V2</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/registry/storagedrivers/" class=""> Docker Registry Storage Driver</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/registry/spec/auth/token/" class=""> Docker Registry v2 Authentication</a>
|
|
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
</section>
|
|
|
|
<section data-accordion>
|
|
|
|
<article data-accordion>
|
|
<button data-control> Open Source at Docker</button>
|
|
<div data-content>
|
|
|
|
|
|
<a data-link href="/opensource/how-to-contribute/" class=""> Overview of contributing</a>
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/get-help/" class=""> Where to chat or get help</a>
|
|
|
|
|
|
|
|
<article data-accordion>
|
|
<button data-control> Configure Development Environment</button>
|
|
<div data-content>
|
|
|
|
|
|
<a data-link href="/docker/project/who-written-for/" class=""> README first</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/software-required/" class=""> Get the required software</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/software-req-win/" class=""> Set up for development on Windows</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/set-up-git/" class=""> Configure Git for contributing</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/set-up-dev-env/" class=""> Work with a development container</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/test-and-docs/" class=""> Run tests and test documentation</a>
|
|
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
|
|
|
|
<article data-accordion>
|
|
<button data-control> Contribution Workflow</button>
|
|
<div data-content>
|
|
|
|
|
|
<a data-link href="/docker/project/make-a-contribution/" class=""> Understand how to contribute</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/find-an-issue/" class=""> Find and claim an issue</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/work-issue/" class=""> Work on your issue</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/create-pr/" class=""> Create a pull request (PR)</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/review-pr/" class=""> Participate in the PR review</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/advanced-contributing/" class=""> Advanced contributing</a>
|
|
|
|
|
|
|
|
|
|
<a data-link href="/docker/project/coding-style/" class=""> Coding style checklist</a>
|
|
|
|
|
|
|
|
</div>
|
|
</article>
|
|
|
|
|
|
|
|
<a data-link href="/opensource/code/" class=""> Contribute code overview</a>
|
|
|
|
|
|
|
|
<a data-link href="/opensource/community/" class=""> Support the community</a>
|
|
|
|
|
|
|
|
<a data-link href="/opensource/issues/" class=""> Organize our issues</a>
|
|
|
|
|
|
|
|
<a data-link href="/opensource/meetups/" class=""> Organize a Docker Meetup</a>
|
|
|
|
|
|
|
|
<a data-link href="/opensource/test/" class=""> Testing contributions</a>
|
|
|
|
|
|
|
|
<article data-accordion>
|
|
<button data-control> Governance</button>
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<a data-link href="/opensource/governance/dgab-info/" class=""> Docker Governance Advisory Board</a>
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<a data-link href="/opensource/governance/board-profiles/" class=""> Board member profiles</a>
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<a data-link href="/opensource/governance/conduct-code/" class=""> Code of conduct</a>
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</article>
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<a data-link href="/docker/project/doc-style/" class=""> Style guide for Docker documentation</a>
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<a data-link href="/release-notes/" class=""> Docker Release Notes</a>
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<a data-link href="https://docs.docker.com/v1.6/" class=""> Version 1.6</a>
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<a data-link href="https://docs.docker.com/v1.5/" class=""> Version 1.5</a>
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<a data-link href="https://docs.docker.com/v1.4/" class=""> Version 1.4</a>
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<div class="large-6 columns">
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<section id="main">
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<article id="content">
|
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|
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|
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<h1 id="process-management-with-cfengine">Process management with CFEngine</h1>
|
|
|
|
<p>Create Docker containers with managed processes.</p>
|
|
|
|
<p>Docker monitors one process in each running container and the container
|
|
lives or dies with that process. By introducing CFEngine inside Docker
|
|
containers, we can alleviate a few of the issues that may arise:</p>
|
|
|
|
<ul>
|
|
<li>It is possible to easily start multiple processes within a
|
|
container, all of which will be managed automatically, with the
|
|
normal <code>docker run</code> command.</li>
|
|
<li>If a managed process dies or crashes, CFEngine will start it again
|
|
within 1 minute.</li>
|
|
<li>The container itself will live as long as the CFEngine scheduling
|
|
daemon (cf-execd) lives. With CFEngine, we are able to decouple the
|
|
life of the container from the uptime of the service it provides.</li>
|
|
</ul>
|
|
|
|
<h2 id="how-it-works">How it works</h2>
|
|
|
|
<p>CFEngine, together with the cfe-docker integration policies, are
|
|
installed as part of the Dockerfile. This builds CFEngine into our
|
|
Docker image.</p>
|
|
|
|
<p>The Dockerfile’s <code>ENTRYPOINT</code> takes an arbitrary
|
|
amount of commands (with any desired arguments) as parameters. When we
|
|
run the Docker container these parameters get written to CFEngine
|
|
policies and CFEngine takes over to ensure that the desired processes
|
|
are running in the container.</p>
|
|
|
|
<p>CFEngine scans the process table for the <code>basename</code> of the commands given
|
|
to the <code>ENTRYPOINT</code> and runs the command to start the process if the <code>basename</code>
|
|
is not found. For example, if we start the container with
|
|
<code>docker run "/path/to/my/application parameters"</code>, CFEngine will look for a
|
|
process named <code>application</code> and run the command. If an entry for <code>application</code>
|
|
is not found in the process table at any point in time, CFEngine will execute
|
|
<code>/path/to/my/application parameters</code> to start the application once again. The
|
|
check on the process table happens every minute.</p>
|
|
|
|
<p>Note that it is therefore important that the command to start your
|
|
application leaves a process with the basename of the command. This can
|
|
be made more flexible by making some minor adjustments to the CFEngine
|
|
policies, if desired.</p>
|
|
|
|
<h2 id="usage">Usage</h2>
|
|
|
|
<p>This example assumes you have Docker installed and working. We will
|
|
install and manage <code>apache2</code> and <code>sshd</code>
|
|
in a single container.</p>
|
|
|
|
<p>There are three steps:</p>
|
|
|
|
<ol>
|
|
<li>Install CFEngine into the container.</li>
|
|
<li>Copy the CFEngine Docker process management policy into the
|
|
containerized CFEngine installation.</li>
|
|
<li>Start your application processes as part of the <code>docker run</code> command.</li>
|
|
</ol>
|
|
|
|
<h3 id="building-the-image">Building the image</h3>
|
|
|
|
<p>The first two steps can be done as part of a Dockerfile, as follows.</p>
|
|
|
|
<pre><code>FROM ubuntu
|
|
MAINTAINER Eystein Måløy Stenberg <eytein.stenberg@gmail.com>
|
|
|
|
RUN apt-get update && apt-get install -y wget lsb-release unzip ca-certificates
|
|
|
|
# install latest CFEngine
|
|
RUN wget -qO- http://cfengine.com/pub/gpg.key | apt-key add -
|
|
RUN echo "deb http://cfengine.com/pub/apt $(lsb_release -cs) main" > /etc/apt/sources.list.d/cfengine-community.list
|
|
RUN apt-get update && apt-get install -y cfengine-community
|
|
|
|
# install cfe-docker process management policy
|
|
RUN wget https://github.com/estenberg/cfe-docker/archive/master.zip -P /tmp/ && unzip /tmp/master.zip -d /tmp/
|
|
RUN cp /tmp/cfe-docker-master/cfengine/bin/* /var/cfengine/bin/
|
|
RUN cp /tmp/cfe-docker-master/cfengine/inputs/* /var/cfengine/inputs/
|
|
RUN rm -rf /tmp/cfe-docker-master /tmp/master.zip
|
|
|
|
# apache2 and openssh are just for testing purposes, install your own apps here
|
|
RUN apt-get update && apt-get install -y openssh-server apache2
|
|
RUN mkdir -p /var/run/sshd
|
|
RUN echo "root:password" | chpasswd # need a password for ssh
|
|
|
|
ENTRYPOINT ["/var/cfengine/bin/docker_processes_run.sh"]
|
|
</code></pre>
|
|
|
|
<p>By saving this file as Dockerfile to a working directory, you can then build
|
|
your image with the docker build command, e.g.,
|
|
<code>docker build -t managed_image</code>.</p>
|
|
|
|
<h3 id="testing-the-container">Testing the container</h3>
|
|
|
|
<p>Start the container with <code>apache2</code> and <code>sshd</code> running and managed, forwarding
|
|
a port to our SSH instance:</p>
|
|
|
|
<pre><code>$ docker run -p 127.0.0.1:222:22 -d managed_image "/usr/sbin/sshd" "/etc/init.d/apache2 start"
|
|
</code></pre>
|
|
|
|
<p>We now clearly see one of the benefits of the cfe-docker integration: it
|
|
allows to start several processes as part of a normal <code>docker run</code> command.</p>
|
|
|
|
<p>We can now log in to our new container and see that both <code>apache2</code> and <code>sshd</code>
|
|
are running. We have set the root password to “password” in the Dockerfile
|
|
above and can use that to log in with ssh:</p>
|
|
|
|
<pre><code>ssh -p222 root@127.0.0.1
|
|
|
|
ps -ef
|
|
UID PID PPID C STIME TTY TIME CMD
|
|
root 1 0 0 07:48 ? 00:00:00 /bin/bash /var/cfengine/bin/docker_processes_run.sh /usr/sbin/sshd /etc/init.d/apache2 start
|
|
root 18 1 0 07:48 ? 00:00:00 /var/cfengine/bin/cf-execd -F
|
|
root 20 1 0 07:48 ? 00:00:00 /usr/sbin/sshd
|
|
root 32 1 0 07:48 ? 00:00:00 /usr/sbin/apache2 -k start
|
|
www-data 34 32 0 07:48 ? 00:00:00 /usr/sbin/apache2 -k start
|
|
www-data 35 32 0 07:48 ? 00:00:00 /usr/sbin/apache2 -k start
|
|
www-data 36 32 0 07:48 ? 00:00:00 /usr/sbin/apache2 -k start
|
|
root 93 20 0 07:48 ? 00:00:00 sshd: root@pts/0
|
|
root 105 93 0 07:48 pts/0 00:00:00 -bash
|
|
root 112 105 0 07:49 pts/0 00:00:00 ps -ef
|
|
</code></pre>
|
|
|
|
<p>If we stop apache2, it will be started again within a minute by
|
|
CFEngine.</p>
|
|
|
|
<pre><code>service apache2 status
|
|
Apache2 is running (pid 32).
|
|
service apache2 stop
|
|
* Stopping web server apache2 ... waiting [ OK ]
|
|
service apache2 status
|
|
Apache2 is NOT running.
|
|
# ... wait up to 1 minute...
|
|
service apache2 status
|
|
Apache2 is running (pid 173).
|
|
</code></pre>
|
|
|
|
<h2 id="adapting-to-your-applications">Adapting to your applications</h2>
|
|
|
|
<p>To make sure your applications get managed in the same manner, there are
|
|
just two things you need to adjust from the above example:</p>
|
|
|
|
<ul>
|
|
<li>In the Dockerfile used above, install your applications instead of
|
|
<code>apache2</code> and <code>sshd</code>.</li>
|
|
<li>When you start the container with <code>docker run</code>,
|
|
specify the command line arguments to your applications rather than
|
|
<code>apache2</code> and <code>sshd</code>.</li>
|
|
</ul>
|
|
|
|
</article>
|
|
</section>
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</div>
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<div id="toc" class="large-3 columns toc ">
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On this page:
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<nav id="TableOfContents">
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<ul>
|
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<li><a href="#process-management-with-cfengine">Process management with CFEngine</a>
|
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<ul>
|
|
<li><a href="#how-it-works">How it works</a></li>
|
|
<li><a href="#usage">Usage</a>
|
|
<ul>
|
|
<li><a href="#building-the-image">Building the image</a></li>
|
|
<li><a href="#testing-the-container">Testing the container</a></li>
|
|
</ul></li>
|
|
<li><a href="#adapting-to-your-applications">Adapting to your applications</a></li>
|
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</ul></li>
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</ul>
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</nav>
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<div id="buildinfo">
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Jul 8, 2015 at 6:45pm (PST)
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BUILD_DATA
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$content.css({
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});
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}
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function updateParentHeight($parentAccordion, $currentAccordion, qty, operation) {
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var $content = $parentAccordion.filter('.open').find('> [data-content]'),
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$matched;
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$childs = $childs.not($currentAccordion.siblings('[data-accordion].open').find('> [data-content]'));
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$(this).data('oHeight', currentHeight + qty);
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calculateHeight($matched);
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$matched.css('max-height', $matched.data('oHeight'));
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}
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}
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}
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$content.css(closedCSS);
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});
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$accordion.addClass('open');
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closeAccordion($accordion, $content);
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});
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function toggleAccordion() {
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var isAccordionGroup = (opts.singleOpen) ? $accordion.parents(opts.groupElement).length > 0 : false;
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calculateHeight($content);
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if(isAccordionGroup) {
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closeSiblingAccordions($accordion);
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}
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if($accordion.hasClass('open')) {
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closeAccordion($accordion, $content);
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} else {
|
|
openAccordion($accordion, $content);
|
|
}
|
|
}
|
|
|
|
function addEventListeners() {
|
|
$controls.on('click', toggleAccordion);
|
|
|
|
$controls.on('accordion.toggle', function() {
|
|
if(opts.singleOpen && $controls.length > 1) {
|
|
return false;
|
|
}
|
|
|
|
toggleAccordion();
|
|
});
|
|
|
|
$(window).on('resize', debounce(function() {
|
|
refreshHeight($accordion);
|
|
}));
|
|
}
|
|
|
|
function setup() {
|
|
$content.each(function() {
|
|
var $curr = $(this);
|
|
|
|
if($curr.css('max-height') != 0) {
|
|
if(!$curr.closest('[data-accordion]').hasClass('open')) {
|
|
$curr.css({ 'max-height': 0, 'overflow': 'hidden' });
|
|
} else {
|
|
toggleTransition($curr);
|
|
calculateHeight($curr);
|
|
|
|
$curr.css('max-height', $curr.data('oHeight'));
|
|
}
|
|
}
|
|
});
|
|
|
|
|
|
if(!$accordion.attr('data-accordion')) {
|
|
$accordion.attr('data-accordion', '');
|
|
$accordion.find(opts.controlElement).attr('data-control', '');
|
|
$accordion.find(opts.contentElement).attr('data-content', '');
|
|
}
|
|
}
|
|
|
|
setup();
|
|
addEventListeners();
|
|
};
|
|
|
|
$.fn[pluginName] = function ( options ) {
|
|
return this.each(function () {
|
|
if (!$.data(this, 'plugin_' + pluginName)) {
|
|
$.data(this, 'plugin_' + pluginName,
|
|
new Accordion( this, options ));
|
|
}
|
|
});
|
|
}
|
|
|
|
})( jQuery, window, document );
|
|
|
|
$(document).ready(function() {
|
|
$('#multiple [data-accordion]').accordion({
|
|
singleOpen: false
|
|
});
|
|
});
|
|
|
|
</script>
|
|
|
|
|
|
<noscript>
|
|
<iframe src="//www.googletagmanager.com/ns.html?id=GTM-PSVHG8"
|
|
height="0" width="0" style="display:none;visibility:hidden"></iframe>
|
|
</noscript>
|
|
<script>
|
|
(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
|
|
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
|
|
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
|
|
'//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
|
|
})(window,document,'script','dataLayer','GTM-PSVHG8');
|
|
</script>
|
|
|