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docker-docs/engine/misc/faq/index.html
2017-04-14 10:39:00 -07:00

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<a data-link href="../../../engine/userguide/dockerizing/" class=""> Hello world in a container</a>
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<a data-link href="../../../engine/misc/" class=""> About Docker</a>
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<a data-link href="../../../machine/" class=""> Overview of Docker Machine</a>
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<a data-link href="../../../engine/articles/host_integration/" class=""> Automatically start containers</a>
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<a data-link href="../../../engine/articles/chef/" class=""> Using Chef</a>
<a data-link href="../../../engine/articles/puppet/" class=""> Using Puppet</a>
<a data-link href="../../../engine/articles/using_supervisord/" class=""> Using Supervisor with Docker</a>
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<a data-link href="../../../engine/userguide/storagedriver/imagesandcontainers/" class=""> Understand images, containers, and storage drivers</a>
<a data-link href="../../../engine/userguide/storagedriver/selectadriver/" class=""> Select a storage driver</a>
<a data-link href="../../../engine/userguide/storagedriver/aufs-driver/" class=""> AUFS storage driver in practice</a>
<a data-link href="../../../engine/userguide/storagedriver/btrfs-driver/" class=""> BTRFS storage in practice</a>
<a data-link href="../../../engine/userguide/storagedriver/device-mapper-driver/" class=""> Device mapper storage in practice</a>
<a data-link href="../../../engine/userguide/storagedriver/overlayfs-driver/" class=""> OverlayFS storage in practice</a>
<a data-link href="../../../engine/userguide/storagedriver/zfs-driver/" class=""> ZFS storage in practice</a>
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<button data-control> Network configuration</button>
<div data-content>
<a data-link href="../../../engine/userguide/networking/dockernetworks/" class=""> Docker container networking</a>
<a data-link href="../../../engine/userguide/networking/work-with-networks/" class=""> Work with network commands</a>
<a data-link href="../../../engine/userguide/networking/get-started-overlay/" class=""> Get started with multi-host networking</a>
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<button data-control> Default bridge network</button>
<div data-content>
<a data-link href="../../../engine/userguide/networking/default_network/dockerlinks/" class=""> Legacy container links</a>
<a data-link href="../../../engine/userguide/networking/default_network/binding/" class=""> Bind container ports to the host</a>
<a data-link href="../../../engine/userguide/networking/default_network/build-bridges/" class=""> Build your own bridge</a>
<a data-link href="../../../engine/userguide/networking/default_network/configure-dns/" class=""> Configure container DNS</a>
<a data-link href="../../../engine/userguide/networking/default_network/custom-docker0/" class=""> Customize the docker0 bridge</a>
<a data-link href="../../../engine/userguide/networking/default_network/container-communication/" class=""> Understand container communication</a>
<a data-link href="../../../engine/userguide/networking/default_network/ipv6/" class=""> IPv6 with Docker</a>
</div>
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<button data-control> Applied Docker</button>
<div data-content>
<a data-link href="../../../engine/examples/mongodb/" class=""> Dockerizing MongoDB</a>
<a data-link href="../../../engine/examples/postgresql_service/" class=""> Dockerizing PostgreSQL</a>
<a data-link href="../../../engine/examples/couchdb_data_volumes/" class=""> Dockerizing a CouchDB service</a>
<a data-link href="../../../engine/examples/nodejs_web_app/" class=""> Dockerizing a Node.js web app</a>
<a data-link href="../../../engine/examples/running_redis_service/" class=""> Dockerizing a Redis service</a>
<a data-link href="../../../engine/examples/apt-cacher-ng/" class=""> Dockerizing an apt-cacher-ng service</a>
</div>
</article>
</div>
</article>
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<section data-accordion>
<article data-accordion>
<button data-control> Manage image repositories</button>
<div data-content>
<a data-link href="../../../engine/userguide/image_management/" class=""> Image management</a>
<article data-accordion>
<button data-control> Docker Hub</button>
<div data-content>
<a data-link href="../../../docker-hub/" class=""> Introducing Docker Hub</a>
<a data-link href="../../../docker-hub/accounts/" class=""> Your Docker Hub account</a>
<a data-link href="../../../docker-hub/repos/" class=""> Repositories on Docker Hub</a>
<a data-link href="../../../docker-hub/builds/" class=""> Automated Builds on Docker Hub</a>
<a data-link href="../../../docker-hub/github/" class=""> Automated Builds from GitHub</a>
<a data-link href="../../../docker-hub/bitbucket/" class=""> Automated Builds with Bitbucket</a>
<a data-link href="../../../docker-hub/orgs/" class=""> Teams &amp; Organizations</a>
<a data-link href="../../../docker-hub/official_repos/" class=""> Official Repositories on Docker Hub</a>
</div>
</article>
<article data-accordion>
<button data-control> Docker Trusted Registry</button>
<div data-content>
<a data-link href="../../../docker-trusted-registry/" class=""> Overview</a>
<article data-accordion>
<button data-control> Trusted Registry installation overview</button>
<div data-content>
<a data-link href="../../../docker-trusted-registry/install/dtr-ami-byol-launch/" class=""> Install Docker Subscription for AWS (BYOL))</a>
<a data-link href="../../../docker-trusted-registry/install/engine-ami-launch/" class=""> Install Docker Engine for AWS AMI (BDS)</a>
<a data-link href="../../../docker-trusted-registry/install/dtr-ami-bds-launch/" class=""> Install Trusted Registry for AWS AMI (BDS)</a>
<a data-link href="../../../docker-trusted-registry/install/install-csengine/" class=""> Manually Install the CS Docker Engine</a>
<a data-link href="../../../docker-trusted-registry/install/install-dtr/" class=""> Manually install Trusted Registry</a>
<a data-link href="../../../docker-trusted-registry/install/upgrade/" class=""> Upgrade Trusted Registry and CS Engine</a>
</div>
</article>
<a data-link href="../../../docker-trusted-registry/quick-start/" class=""> Quick-start: Basic Workflow</a>
<a data-link href="../../../docker-trusted-registry/userguide/" class=""> User guide</a>
<a data-link href="../../../docker-trusted-registry/adminguide/" class=""> Admin guide</a>
<a data-link href="../../../docker-trusted-registry/configuration/" class=""> Configuration options</a>
<a data-link href="../../../docker-trusted-registry/license/" class=""> Trusted Registry License</a>
<article data-accordion>
<button data-control> DTR APIs</button>
<div data-content>
<a data-link href="../../../docker-trusted-registry/api/" class=""> Docker Trusted Registry Accounts &amp; Repos API: Intro &amp; Overview</a>
<a data-link href="../../../docker-trusted-registry/api/dtr_1_3_accounts/" class=""> Docker Trusted Registry Accounts API</a>
<a data-link href="../../../docker-trusted-registry/api/dtr_1_3_teams/" class=""> Docker Trusted Registry User and Org API</a>
<a data-link href="../../../docker-trusted-registry/api/dtr_1_3_repositories/" class=""> Docker Trusted Registry Repository API</a>
<a data-link href="../../../docker-trusted-registry/api/dtr_1_3_user_repo_access/" class=""> Docker Trusted Registry User Repository API</a>
<a data-link href="../../../docker-trusted-registry/api/dtr_1_3_team_repo_access/" class=""> Docker Trusted Registry Org Repository API</a>
<a data-link href="../../../docker-trusted-registry/api/dtr_1_3_team_repo_namespace_access/" class=""> Docker Trusted Registry Org Namespace API</a>
</div>
</article>
<a data-link href="../../../docker-trusted-registry/support/" class=""> Support</a>
<a data-link href="../../../docker-trusted-registry/release-notes/" class=""> Release notes</a>
<a data-link href="../../../docker-trusted-registry/prior-release-notes/" class=""> Prior release notes archive</a>
</div>
</article>
<article data-accordion>
<button data-control> Docker Registry</button>
<div data-content>
<a data-link href="../../../registry/" class=""> Docker Registry</a>
<a data-link href="../../../registry/introduction/" class=""> Understanding the Registry</a>
<a data-link href="../../../registry/deploying/" class=""> Deploying a registry server</a>
<a data-link href="../../../registry/configuration/" class=""> Configuring a registry</a>
<a data-link href="../../../registry/notifications/" class=""> Working with notifications</a>
<a data-link href="../../../registry/help/" class=""> Getting help</a>
</div>
</article>
<article data-accordion>
<button data-control> Use trusted images</button>
<div data-content>
<a data-link href="../../../engine/security/trust/content_trust/" class=""> Content trust in Docker</a>
<a data-link href="../../../engine/security/trust/trust_automation/" class=""> Automation with content trust</a>
<a data-link href="../../../engine/security/trust/trust_key_mng/" class=""> Manage keys for content trust</a>
<a data-link href="../../../engine/security/trust/trust_sandbox/" class=""> Play in a content trust sandbox</a>
</div>
</article>
<a data-link href="../../../engine/articles/certificates/" class=""> Using certificates for repository client verification</a>
<a data-link href="../../../engine/articles/registry_mirror/" class=""> Run a local registry mirror</a>
</div>
</article>
</section>
<section data-accordion>
<article data-accordion>
<button data-control> Extend Docker</button>
<div data-content>
<a data-link href="../../../engine/extend/plugins_network/" class=""> Docker network driver plugins</a>
<a data-link href="../../../engine/extend/plugins/" class=""> Extending Docker with plugins</a>
<a data-link href="../../../engine/extend/plugins_volume/" class=""> Volume plugins</a>
<a data-link href="../../../engine/extend/plugin_api/" class=""> Plugins API</a>
</div>
</article>
</section>
<section data-accordion>
<article data-accordion>
<button data-control> Command and API references</button>
<div data-content>
<a data-link href="../../../engine/reference/run/" class=""> Docker run reference</a>
<a data-link href="../../../engine/reference/builder/" class=""> Dockerfile reference</a>
<a data-link href="../../../engine/reference/api/remote_api_client_libraries/" class=""> Remote API client libraries</a>
<article data-accordion>
<button data-control> Using the command line</button>
<div data-content>
<a data-link href="../../../engine/reference/commandline/cli/" class=""> Use the Docker command line</a>
<a data-link href="../../../engine/reference/commandline/daemon/" class=""> daemon</a>
<a data-link href="../../../engine/reference/commandline/attach/" class=""> attach</a>
<a data-link href="../../../engine/reference/commandline/build/" class=""> build</a>
<a data-link href="../../../engine/reference/commandline/commit/" class=""> commit</a>
<a data-link href="../../../engine/reference/commandline/cp/" class=""> cp</a>
<a data-link href="../../../engine/reference/commandline/create/" class=""> create</a>
<a data-link href="../../../engine/reference/commandline/diff/" class=""> diff</a>
<a data-link href="../../../engine/reference/commandline/events/" class=""> events</a>
<a data-link href="../../../engine/reference/commandline/exec/" class=""> exec</a>
<a data-link href="../../../engine/reference/commandline/export/" class=""> export</a>
<a data-link href="../../../engine/reference/commandline/history/" class=""> history</a>
<a data-link href="../../../engine/reference/commandline/images/" class=""> images</a>
<a data-link href="../../../engine/reference/commandline/import/" class=""> import</a>
<a data-link href="../../../engine/reference/commandline/info/" class=""> info</a>
<a data-link href="../../../engine/reference/commandline/inspect/" class=""> inspect</a>
<a data-link href="../../../engine/reference/commandline/kill/" class=""> kill</a>
<a data-link href="../../../engine/reference/commandline/load/" class=""> load</a>
<a data-link href="../../../engine/reference/commandline/login/" class=""> login</a>
<a data-link href="../../../engine/reference/commandline/logout/" class=""> logout</a>
<a data-link href="../../../engine/reference/commandline/logs/" class=""> logs</a>
<a data-link href="../../../engine/reference/commandline/network_connect/" class=""> network connect</a>
<a data-link href="../../../engine/reference/commandline/network_create/" class=""> network create</a>
<a data-link href="../../../engine/reference/commandline/network_disconnect/" class=""> network disconnect</a>
<a data-link href="../../../engine/reference/commandline/network_inspect/" class=""> network inspect</a>
<a data-link href="../../../engine/reference/commandline/network_ls/" class=""> network ls</a>
<a data-link href="../../../engine/reference/commandline/network_rm/" class=""> network rm</a>
<a data-link href="../../../engine/reference/commandline/pause/" class=""> pause</a>
<a data-link href="../../../engine/reference/commandline/port/" class=""> port</a>
<a data-link href="../../../engine/reference/commandline/ps/" class=""> ps</a>
<a data-link href="../../../engine/reference/commandline/pull/" class=""> pull</a>
<a data-link href="../../../engine/reference/commandline/push/" class=""> push</a>
<a data-link href="../../../engine/reference/commandline/rename/" class=""> rename</a>
<a data-link href="../../../engine/reference/commandline/restart/" class=""> restart</a>
<a data-link href="../../../engine/reference/commandline/rm/" class=""> rm</a>
<a data-link href="../../../engine/reference/commandline/rmi/" class=""> rmi</a>
<a data-link href="../../../engine/reference/commandline/run/" class=""> run</a>
<a data-link href="../../../engine/reference/commandline/save/" class=""> save</a>
<a data-link href="../../../engine/reference/commandline/search/" class=""> search</a>
<a data-link href="../../../engine/reference/commandline/start/" class=""> start</a>
<a data-link href="../../../engine/reference/commandline/stats/" class=""> stats</a>
<a data-link href="../../../engine/reference/commandline/stop/" class=""> stop</a>
<a data-link href="../../../engine/reference/commandline/tag/" class=""> tag</a>
<a data-link href="../../../engine/reference/commandline/top/" class=""> top</a>
<a data-link href="../../../engine/reference/commandline/unpause/" class=""> unpause</a>
<a data-link href="../../../engine/reference/commandline/version/" class=""> version</a>
<a data-link href="../../../engine/reference/commandline/volume_create/" class=""> volume create</a>
<a data-link href="../../../engine/reference/commandline/volume_inspect/" class=""> volume inspect</a>
<a data-link href="../../../engine/reference/commandline/volume_ls/" class=""> volume ls</a>
<a data-link href="../../../engine/reference/commandline/volume_rm/" class=""> volume rm</a>
<a data-link href="../../../engine/reference/commandline/wait/" class=""> wait</a>
</div>
</article>
<a data-link href="../../../engine/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="../../../engine/reference/api/docker_remote_api/" class=""> Remote API</a>
<a data-link href="../../../engine/reference/api/docker_remote_api_v1.21/" class=""> Remote API v1.21</a>
<a data-link href="../../../engine/reference/api/docker_remote_api_v1.20/" class=""> Remote API v1.20</a>
<a data-link href="../../../engine/reference/api/docker_remote_api_v1.19/" class=""> Remote API v1.19</a>
<a data-link href="../../../engine/reference/api/docker_remote_api_v1.18/" class=""> Remote API v1.18</a>
<a data-link href="../../../engine/reference/api/docker_remote_api_v1.17/" class=""> Remote API v1.17</a>
<a data-link href="../../../engine/reference/api/docker_remote_api_v1.16/" class=""> Remote API v1.16</a>
<a data-link href="../../../engine/reference/api/docker_remote_api_v1.15/" class=""> Remote API v1.15</a>
<a data-link href="../../../engine/reference/api/docker_remote_api_v1.14/" class=""> Remote API v1.14</a>
<a data-link href="../../../engine/reference/api/docker-io_api/" class=""> Docker Hub API</a>
</div>
</article>
<article data-accordion>
<button data-control> Docker Hub</button>
<div data-content>
<a data-link href="../../../engine/reference/api/hub_registry_spec/" class=""> The Docker Hub and the Registry v1</a>
</div>
</article>
<a data-link href="../../../docker-trusted-registry/api/dtr_api/" class=""> Docker Trusted Registry</a>
<article data-accordion>
<button data-control> Docker Compose Reference</button>
<div data-content>
<article data-accordion>
<button data-control> Compose CLI reference</button>
<div data-content>
<a data-link href="../../../compose/reference/overview/" class=""> Introduction to the CLI</a>
<a data-link href="../../../compose/reference/docker-compose/" class=""> docker-compose</a>
<a data-link href="../../../compose/reference/build/" class=""> build</a>
<a data-link href="../../../compose/reference/help/" class=""> help</a>
<a data-link href="../../../compose/reference/kill/" class=""> kill</a>
<a data-link href="../../../compose/reference/logs/" class=""> logs</a>
<a data-link href="../../../compose/reference/pause/" class=""> pause</a>
<a data-link href="../../../compose/reference/port/" class=""> port</a>
<a data-link href="../../../compose/reference/ps/" class=""> ps</a>
<a data-link href="../../../compose/reference/pull/" class=""> pull</a>
<a data-link href="../../../compose/reference/restart/" class=""> restart</a>
<a data-link href="../../../compose/reference/rm/" class=""> rm</a>
<a data-link href="../../../compose/reference/run/" class=""> run</a>
<a data-link href="../../../compose/reference/scale/" class=""> scale</a>
<a data-link href="../../../compose/reference/start/" class=""> start</a>
<a data-link href="../../../compose/reference/stop/" class=""> stop</a>
<a data-link href="../../../compose/reference/unpause/" class=""> unpause</a>
<a data-link href="../../../compose/reference/up/" class=""> up</a>
</div>
</article>
<a data-link href="../../../compose/compose-file/" class=""> Compose file reference</a>
<a data-link href="../../../compose/env/" class=""> Compose environment variables reference</a>
</div>
</article>
<article data-accordion>
<button data-control> Docker Machine Reference</button>
<div data-content>
<article data-accordion>
<button data-control> Drivers</button>
<div data-content>
<a data-link href="../../../machine/drivers/os-base/" class=""> Driver options and operating system defaults</a>
<a data-link href="../../../machine/drivers/aws/" class=""> Amazon Web Services</a>
<a data-link href="../../../machine/drivers/digital-ocean/" class=""> Digital Ocean</a>
<a data-link href="../../../machine/drivers/generic/" class=""> Generic</a>
<a data-link href="../../../machine/drivers/gce/" class=""> Google Compute Engine</a>
<a data-link href="../../../machine/drivers/soft-layer/" class=""> IBM Softlayer</a>
<a data-link href="../../../machine/drivers/azure/" class=""> Microsoft Azure</a>
<a data-link href="../../../machine/drivers/hyper-v/" class=""> Microsoft Hyper-V</a>
<a data-link href="../../../machine/drivers/openstack/" class=""> OpenStack</a>
<a data-link href="../../../machine/drivers/virtualbox/" class=""> Oracle VirtualBox</a>
<a data-link href="../../../machine/drivers/rackspace/" class=""> Rackspace</a>
<a data-link href="../../../machine/drivers/vm-fusion/" class=""> VMware Fusion</a>
<a data-link href="../../../machine/drivers/vm-cloud/" class=""> VMware vCloud Air</a>
<a data-link href="../../../machine/drivers/vsphere/" class=""> VMware vSphere</a>
<a data-link href="../../../machine/drivers/exoscale/" class=""> exoscale</a>
</div>
</article>
<article data-accordion>
<button data-control> Subcommands</button>
<div data-content>
<a data-link href="../../../machine/reference/active/" class=""> active</a>
<a data-link href="../../../machine/reference/config/" class=""> config</a>
<a data-link href="../../../machine/reference/create/" class=""> create</a>
<a data-link href="../../../machine/reference/env/" class=""> env</a>
<a data-link href="../../../machine/reference/help/" class=""> help</a>
<a data-link href="../../../machine/reference/inspect/" class=""> inspect</a>
<a data-link href="../../../machine/reference/ip/" class=""> ip</a>
<a data-link href="../../../machine/reference/kill/" class=""> kill</a>
<a data-link href="../../../machine/reference/ls/" class=""> ls</a>
<a data-link href="../../../machine/reference/regenerate-certs/" class=""> regenerate-certs</a>
<a data-link href="../../../machine/reference/restart/" class=""> restart</a>
<a data-link href="../../../machine/reference/rm/" class=""> rm</a>
<a data-link href="../../../machine/reference/scp/" class=""> scp</a>
<a data-link href="../../../machine/reference/ssh/" class=""> ssh</a>
<a data-link href="../../../machine/reference/start/" class=""> start</a>
<a data-link href="../../../machine/reference/status/" class=""> status</a>
<a data-link href="../../../machine/reference/stop/" class=""> stop</a>
<a data-link href="../../../machine/reference/upgrade/" class=""> upgrade</a>
<a data-link href="../../../machine/reference/url/" class=""> url</a>
</div>
</article>
</div>
</article>
<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=""> HTTP API V2</a>
<a data-link href="../../../registry/storagedrivers/" class=""> Storage Drivers</a>
<a data-link href="../../../registry/spec/auth/jwt/" class=""> Token Authentication Implementation</a>
<a data-link href="../../../registry/spec/auth/token/" class=""> Token Authentication Specification</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/code/" class=""> Quickstart contribution</a>
<article data-accordion>
<button data-control> Set up for Engine Development</button>
<div data-content>
<a data-link href="../../../opensource/project/who-written-for/" class=""> README first</a>
<a data-link href="../../../opensource/project/software-required/" class=""> Get the required software</a>
<a data-link href="../../../opensource/project/software-req-win/" class=""> Set up for development on Windows</a>
<a data-link href="../../../opensource/project/set-up-git/" class=""> Configure Git for contributing</a>
<a data-link href="../../../opensource/project/set-up-dev-env/" class=""> Work with a development container</a>
<a data-link href="../../../opensource/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="../../../opensource/workflow/make-a-contribution/" class=""> Understand how to contribute</a>
<a data-link href="../../../opensource/workflow/find-an-issue/" class=""> Find and claim an issue</a>
<a data-link href="../../../opensource/workflow/work-issue/" class=""> Work on your issue</a>
<a data-link href="../../../opensource/workflow/create-pr/" class=""> Create a pull request (PR)</a>
<a data-link href="../../../opensource/workflow/review-pr/" class=""> Participate in the PR review</a>
<a data-link href="../../../opensource/workflow/advanced-contributing/" class=""> Advanced contributing</a>
<a data-link href="../../../opensource/workflow/coding-style/" class=""> Coding style checklist</a>
</div>
</article>
<article data-accordion>
<button data-control> Other ways to contribute</button>
<div data-content>
<a data-link href="../../../opensource/ways/meetups/" class=""> Organize a Docker Meetup</a>
<a data-link href="../../../opensource/ways/issues/" class=""> Organize our issues</a>
<a data-link href="../../../opensource/ways/community/" class=""> Support the community</a>
<a data-link href="../../../opensource/ways/test/" class=""> Testing contributions</a>
</div>
</article>
<article data-accordion>
<button data-control> Governance</button>
<div data-content>
<a data-link href="../../../opensource/governance/dgab-info/" class=""> Docker Governance Advisory Board</a>
<a data-link href="../../../opensource/governance/board-profiles/" class=""> Board member profiles</a>
<a data-link href="../../../opensource/governance/conduct-code/" class=""> Code of conduct</a>
</div>
</article>
<a data-link href="../../../opensource/FAQ/" class=""> FAQ for contributors</a>
<a data-link href="../../../opensource/get-help/" class=""> Where to chat or get help</a>
<a data-link href="../../../opensource/doc-style/" class=""> Style guide for Docker documentation</a>
</div>
</article>
</section>
<section data-accordion>
<article data-accordion>
<button data-control> About</button>
<div data-content>
<a data-link href="../../../release-notes/" class=""> Docker Release Notes</a>
<a data-link href="../../../engine/misc/faq/" class=" active"> FAQ</a>
<a data-link href="../../../engine/reference/glossary/" class=""> Docker Glossary</a>
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</article>
</section>
<section data-accordion>
<article data-accordion>
<button style="visibility: hidden" data-control> Docs archive</button>
<div data-content>
<a data-link href="http://docs.docker.com/v1.7/" class=""> Version 1.7</a>
<a data-link href="http://docs.docker.com/v1.6/" class=""> Version 1.6</a>
<a data-link href="http://docs.docker.com/v1.5/" class=""> Version 1.5</a>
<a data-link href="http://docs.docker.com/v1.4/" class=""> Version 1.4</a>
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<article id="content">
<h1 id="frequently-asked-questions-faq">Frequently Asked Questions (FAQ)</h1>
<p>If you don&rsquo;t see your question here, feel free to submit new ones to
<a href="mailto:docs@docker.com">docs@docker.com</a>. Or, you can fork <a href="https://github.com/docker/docker">the
repo</a> and contribute them yourself by editing
the documentation sources.</p>
<h3 id="how-much-does-docker-cost">How much does Docker cost?</h3>
<p>Docker is 100% free. It is open source, so you can use it without paying.</p>
<h3 id="what-open-source-license-are-you-using">What open source license are you using?</h3>
<p>We are using the Apache License Version 2.0, see it here:
<a href="https://github.com/docker/docker/blob/master/LICENSE">https://github.com/docker/docker/blob/master/LICENSE</a></p>
<h3 id="does-docker-run-on-mac-os-x-or-windows">Does Docker run on Mac OS X or Windows?</h3>
<p>Docker currently runs only on Linux, but you can use VirtualBox to run Docker in
a virtual machine on your box, and get the best of both worlds. Check out the
<a href="../../../engine/installation/mac/"><em>Mac OS X</em></a> and <a href="../../../engine/installation/windows/"><em>Microsoft
Windows</em></a> installation guides. The small Linux
distribution Docker Machine can be run inside virtual machines on these two
operating systems.</p>
<blockquote>
<p><strong>Note:</strong> if you are using a remote Docker daemon on a VM through Docker
Machine, then <em>do not</em> type the <code>sudo</code> before the <code>docker</code> commands shown in
the documentation&rsquo;s examples.</p>
</blockquote>
<h3 id="how-do-containers-compare-to-virtual-machines">How do containers compare to virtual machines?</h3>
<p>They are complementary. VMs are best used to allocate chunks of hardware
resources. Containers operate at the process level, which makes them very
lightweight and perfect as a unit of software delivery.</p>
<h3 id="what-does-docker-add-to-just-plain-lxc">What does Docker add to just plain LXC?</h3>
<p>Docker is not a replacement for LXC. &ldquo;LXC&rdquo; refers to capabilities of the Linux
kernel (specifically namespaces and control groups) which allow sandboxing
processes from one another, and controlling their resource allocations. On top
of this low-level foundation of kernel features, Docker offers a high-level tool
with several powerful functionalities:</p>
<ul>
<li><p><em>Portable deployment across machines.</em> Docker defines a format for bundling
an application and all its dependencies into a single object which can be
transferred to any Docker-enabled machine, and executed there with the
guarantee that the execution environment exposed to the application will be the
same. LXC implements process sandboxing, which is an important pre-requisite
for portable deployment, but that alone is not enough for portable deployment.
If you sent me a copy of your application installed in a custom LXC
configuration, it would almost certainly not run on my machine the way it does
on yours, because it is tied to your machine&rsquo;s specific configuration:
networking, storage, logging, distro, etc. Docker defines an abstraction for
these machine-specific settings, so that the exact same Docker container can
run - unchanged - on many different machines, with many different
configurations.</p></li>
<li><p><em>Application-centric.</em> Docker is optimized for the deployment of
applications, as opposed to machines. This is reflected in its API, user
interface, design philosophy and documentation. By contrast, the <code>lxc</code> helper
scripts focus on containers as lightweight machines - basically servers that
boot faster and need less RAM. We think there&rsquo;s more to containers than just
that.</p></li>
<li><p><em>Automatic build.</em> Docker includes <a href="../../../engine/reference/builder/"><em>a tool for developers to automatically
assemble a container from their source
code</em></a>, with full control over application
dependencies, build tools, packaging etc. They are free to use <code>make</code>, <code>maven</code>,
<code>chef</code>, <code>puppet</code>, <code>salt,</code> Debian packages, RPMs, source tarballs, or any
combination of the above, regardless of the configuration of the machines.</p></li>
<li><p><em>Versioning.</em> Docker includes git-like capabilities for tracking successive
versions of a container, inspecting the diff between versions, committing new
versions, rolling back etc. The history also includes how a container was
assembled and by whom, so you get full traceability from the production server
all the way back to the upstream developer. Docker also implements incremental
uploads and downloads, similar to <code>git pull</code>, so new versions of a container
can be transferred by only sending diffs.</p></li>
<li><p><em>Component re-use.</em> Any container can be used as a <a href="../../../engine/reference/glossary/#image"><em>&ldquo;base image&rdquo;</em></a> to create more specialized components. This can
be done manually or as part of an automated build. For example you can prepare
the ideal Python environment, and use it as a base for 10 different
applications. Your ideal PostgreSQL setup can be re-used for all your future
projects. And so on.</p></li>
<li><p><em>Sharing.</em> Docker has access to a public registry <a href="https://hub.docker.com/">on Docker Hub</a>
where thousands of people have uploaded useful images: anything from Redis,
CouchDB, PostgreSQL to IRC bouncers to Rails app servers to Hadoop to base
images for various Linux distros. The
<a href="https://docs.docker.com/registry/"><em>registry</em></a> also
includes an official &ldquo;standard library&rdquo; of useful containers maintained by the
Docker team. The registry itself is open-source, so anyone can deploy their own
registry to store and transfer private containers, for internal server
deployments for example.</p></li>
<li><p><em>Tool ecosystem.</em> Docker defines an API for automating and customizing the
creation and deployment of containers. There are a huge number of tools
integrating with Docker to extend its capabilities. PaaS-like deployment
(Dokku, Deis, Flynn), multi-node orchestration (Maestro, Salt, Mesos, Openstack
Nova), management dashboards (docker-ui, Openstack Horizon, Shipyard),
configuration management (Chef, Puppet), continuous integration (Jenkins,
Strider, Travis), etc. Docker is rapidly establishing itself as the standard
for container-based tooling.</p></li>
</ul>
<h3 id="what-is-different-between-a-docker-container-and-a-vm">What is different between a Docker container and a VM?</h3>
<p>There&rsquo;s a great StackOverflow answer <a href="http://stackoverflow.com/questions/16047306/how-is-docker-io-different-from-a-normal-virtual-machine">showing the differences</a>.</p>
<h3 id="do-i-lose-my-data-when-the-container-exits">Do I lose my data when the container exits?</h3>
<p>Not at all! Any data that your application writes to disk gets preserved in its
container until you explicitly delete the container. The file system for the
container persists even after the container halts.</p>
<h3 id="how-far-do-docker-containers-scale">How far do Docker containers scale?</h3>
<p>Some of the largest server farms in the world today are based on containers.
Large web deployments like Google and Twitter, and platform providers such as
Heroku and dotCloud all run on container technology, at a scale of hundreds of
thousands or even millions of containers running in parallel.</p>
<h3 id="how-do-i-connect-docker-containers">How do I connect Docker containers?</h3>
<p>Currently the recommended way to connect containers is via the Docker network feature. You can see details of how to <a href="https://docs.docker.com/networking">work with Docker networks here</a>.</p>
<p>Also useful for more flexible service portability is the <a href="../../../engine/articles/ambassador_pattern_linking/">Ambassador linking
pattern</a>.</p>
<h3 id="how-do-i-run-more-than-one-process-in-a-docker-container">How do I run more than one process in a Docker container?</h3>
<p>Any capable process supervisor such as <a href="http://supervisord.org/">http://supervisord.org/</a>, runit, s6, or daemontools can do the trick. Docker
will start up the process management daemon which will then fork to run
additional processes. As long as the processor manager daemon continues to run,
the container will continue to as well. You can see a more substantial example
<a href="../../../engine/articles/using_supervisord/">that uses supervisord here</a>.</p>
<h3 id="what-platforms-does-docker-run-on">What platforms does Docker run on?</h3>
<p>Linux:</p>
<ul>
<li>Ubuntu 12.04, 13.04 et al</li>
<li>Fedora 19/20+</li>
<li>RHEL 6.5+</li>
<li>CentOS 6+</li>
<li>Gentoo</li>
<li>ArchLinux</li>
<li>openSUSE 12.3+</li>
<li>CRUX 3.0+</li>
</ul>
<p>Cloud:</p>
<ul>
<li>Amazon EC2</li>
<li>Google Compute Engine</li>
<li>Microsoft Azure</li>
<li>Rackspace</li>
</ul>
<h3 id="how-do-i-report-a-security-issue-with-docker">How do I report a security issue with Docker?</h3>
<p>You can learn about the project&rsquo;s security policy
<a href="https://www.docker.com/security/">here</a> and report security issues to this
<a href="mailto:security@docker.com">mailbox</a>.</p>
<h3 id="why-do-i-need-to-sign-my-commits-to-docker-with-the-dco">Why do I need to sign my commits to Docker with the DCO?</h3>
<p>Please read <a href="http://blog.docker.com/2014/01/docker-code-contributions-require-developer-certificate-of-origin/">our blog post</a> on the introduction of the DCO.</p>
<h3 id="when-building-an-image-should-i-prefer-system-libraries-or-bundled-ones">When building an image, should I prefer system libraries or bundled ones?</h3>
<p><em>This is a summary of a discussion on the <a href="https://groups.google.com/forum/#!topic/docker-dev/L2RBSPDu1L0">docker-dev mailing list</a>.</em></p>
<p>Virtually all programs depend on third-party libraries. Most frequently, they
will use dynamic linking and some kind of package dependency, so that when
multiple programs need the same library, it is installed only once.</p>
<p>Some programs, however, will bundle their third-party libraries, because they
rely on very specific versions of those libraries. For instance, Node.js bundles
OpenSSL; MongoDB bundles V8 and Boost (among others).</p>
<p>When creating a Docker image, is it better to use the bundled libraries, or
should you build those programs so that they use the default system libraries
instead?</p>
<p>The key point about system libraries is not about saving disk or memory space.
It is about security. All major distributions handle security seriously, by
having dedicated security teams, following up closely with published
vulnerabilities, and disclosing advisories themselves. (Look at the <a href="https://www.debian.org/security/">Debian
Security Information</a> for an example of those
procedures.) Upstream developers, however, do not always implement similar
practices.</p>
<p>Before setting up a Docker image to compile a program from source, if you want
to use bundled libraries, you should check if the upstream authors provide a
convenient way to announce security vulnerabilities, and if they update their
bundled libraries in a timely manner. If they don&rsquo;t, you are exposing yourself
(and the users of your image) to security vulnerabilities.</p>
<p>Likewise, before using packages built by others, you should check if the
channels providing those packages implement similar security best practices.
Downloading and installing an &ldquo;all-in-one&rdquo; .deb or .rpm sounds great at first,
except if you have no way to figure out that it contains a copy of the OpenSSL
library vulnerable to the <a href="http://heartbleed.com/">Heartbleed</a> bug.</p>
<h3 id="why-is-debian-frontend-noninteractive-discouraged-in-dockerfiles">Why is <code>DEBIAN_FRONTEND=noninteractive</code> discouraged in Dockerfiles?</h3>
<p>When building Docker images on Debian and Ubuntu you may have seen errors like:</p>
<pre><code>unable to initialize frontend: Dialog
</code></pre>
<p>These errors don&rsquo;t stop the image from being built but inform you that the
installation process tried to open a dialog box, but was unable to. Generally,
these errors are safe to ignore.</p>
<p>Some people circumvent these errors by changing the <code>DEBIAN_FRONTEND</code>
environment variable inside the Dockerfile using:</p>
<pre><code>ENV DEBIAN_FRONTEND=noninteractive
</code></pre>
<p>This prevents the installer from opening dialog boxes during installation which
stops the errors.</p>
<p>While this may sound like a good idea, it <em>may</em> have side effects. The
<code>DEBIAN_FRONTEND</code> environment variable will be inherited by all images and
containers built from your image, effectively changing their behavior. People
using those images will run into problems when installing software
interactively, because installers will not show any dialog boxes.</p>
<p>Because of this, and because setting <code>DEBIAN_FRONTEND</code> to <code>noninteractive</code> is
mainly a &lsquo;cosmetic&rsquo; change, we <em>discourage</em> changing it.</p>
<p>If you <em>really</em> need to change its setting, make sure to change it back to its
<a href="https://www.debian.org/releases/stable/i386/ch05s03.html.en">default value</a>
afterwards.</p>
<h3 id="why-do-i-get-connection-reset-by-peer-when-making-a-request-to-a-service-running-in-a-container">Why do I get <code>Connection reset by peer</code> when making a request to a service running in a container?</h3>
<p>Typically, this message is returned if the service is already bound to your
localhost. As a result, requests coming to the container from outside are
dropped. To correct this problem, change the service&rsquo;s configuration on your
localhost so that the service accepts requests from all IPs. If you aren&rsquo;t sure
how to do this, check the documentation for your OS.</p>
<h3 id="where-can-i-find-more-answers">Where can I find more answers?</h3>
<p>You can find more answers on:</p>
<ul>
<li><a href="https://groups.google.com/d/forum/docker-user">Docker user mailinglist</a></li>
<li><a href="https://groups.google.com/d/forum/docker-dev">Docker developer mailinglist</a></li>
<li><a href="irc://chat.freenode.net#docker">IRC, docker on freenode</a></li>
<li><a href="https://github.com/docker/docker">GitHub</a></li>
<li><a href="http://stackoverflow.com/search?q=docker">Ask questions on Stackoverflow</a></li>
<li><a href="http://twitter.com/docker">Join the conversation on Twitter</a></li>
</ul>
<p>Looking for something else to read? Checkout the <a href="../../../engine/userguide/">User Guide</a>.</p>
</article>
</section>
</div>
<div id="toc" class="large-3 columns toc ">
On this page:
<nav id="TableOfContents">
<ul>
<li><a href="#frequently-asked-questions-faq">Frequently Asked Questions (FAQ)</a>
<ul>
<li>
<ul>
<li><a href="#how-much-does-docker-cost">How much does Docker cost?</a></li>
<li><a href="#what-open-source-license-are-you-using">What open source license are you using?</a></li>
<li><a href="#does-docker-run-on-mac-os-x-or-windows">Does Docker run on Mac OS X or Windows?</a></li>
<li><a href="#how-do-containers-compare-to-virtual-machines">How do containers compare to virtual machines?</a></li>
<li><a href="#what-does-docker-add-to-just-plain-lxc">What does Docker add to just plain LXC?</a></li>
<li><a href="#what-is-different-between-a-docker-container-and-a-vm">What is different between a Docker container and a VM?</a></li>
<li><a href="#do-i-lose-my-data-when-the-container-exits">Do I lose my data when the container exits?</a></li>
<li><a href="#how-far-do-docker-containers-scale">How far do Docker containers scale?</a></li>
<li><a href="#how-do-i-connect-docker-containers">How do I connect Docker containers?</a></li>
<li><a href="#how-do-i-run-more-than-one-process-in-a-docker-container">How do I run more than one process in a Docker container?</a></li>
<li><a href="#what-platforms-does-docker-run-on">What platforms does Docker run on?</a></li>
<li><a href="#how-do-i-report-a-security-issue-with-docker">How do I report a security issue with Docker?</a></li>
<li><a href="#why-do-i-need-to-sign-my-commits-to-docker-with-the-dco">Why do I need to sign my commits to Docker with the DCO?</a></li>
<li><a href="#when-building-an-image-should-i-prefer-system-libraries-or-bundled-ones">When building an image, should I prefer system libraries or bundled ones?</a></li>
<li><a href="#why-is-debian-frontend-noninteractive-discouraged-in-dockerfiles">Why is <code>DEBIAN_FRONTEND=noninteractive</code> discouraged in Dockerfiles?</a></li>
<li><a href="#why-do-i-get-connection-reset-by-peer-when-making-a-request-to-a-service-running-in-a-container">Why do I get <code>Connection reset by peer</code> when making a request to a service running in a container?</a></li>
<li><a href="#where-can-i-find-more-answers">Where can I find more answers?</a></li>
</ul></li>
</ul></li>
</ul>
</nav>
</div>
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Nov 3, 2015 at 7:59pm (PST)
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