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This will allow you to access the database information via consistent environment variables no matter what the name of the container is. In order to build a wordpress container that works with both databases the container should look for the alias, in our example ` db`, when linking to the database.
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Using links we can easily swap out the backend database and not have to change our configuration files for the wordpress site. When running a WordPress container we need to be able to connect to a database such as MySQL or MariaDB. If a database container only exposes port 8080 then the linked container will only be allowed to access port 8080 and nothing else if inter-container communication is set to false.
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When linking two containers Docker will use the exposed ports of the container to create a secure tunnel for the parent to access. The parent container will be able to access information via environment variables of the child such as name, exposed ports, ip, and environment variables. When two containers are linked together Docker creates a parent child relationship between the containers. This is a huge win for securing your containers. With this flag set to false, Container A cannot access Container B unless explicitly allowed via a link. In 0.6.5 inter-container communication can be disabled with the daemon flag -icc=false. Links allow containers to discover and securely communicate with each other. docker run -d -name mariadb user/mariadbĮvery command that worked with a container_id can now be used with a name that you specified:.ExamplesĮnough talk, let’s see some examples! You can run two databases with corresponding names like so: When you link one container to another you will have to provide the name and alias of the child that you want to link to via -link child_name:alias. If no name is specified Docker will automatically generate a name. We are happy to announce that we can finally close issue #1! You can now give memorable names to your containers using the new -name flag for docker run. Please see Advanced port redirects below for details. We did our best to keep the disruption to a minimum, and we hope you’ll agree that the new features are worth it. Second, in order to improve port redirection we had to introduce two small breaking changes.
DOCKER REMOVE CONTAINER ID INSTALL
Please make sure to install lxc 0.8 or 0.7 before you make the upgrade. Not bad for a minor release! (sorry if we forgot anyone).įirst, i f you are running the brand new Ubuntu 13.10, your version of the lxc scripts is unstable and not supported by Docker. In addition to numerous bug fixes, this release introduces container naming, links between containers, better host integration, and advanced port redirects.Ī big thank you to (in no particular order) to Paul Nasrat, Tianon Gravi, Edmund Wagner, Travis Cline, Gurjeet Singh, Justin Force, Johan Euphrosine, Ole Reifschneider, Will Rouesnel, Alex Larsson, Greg Thornton, Sven Dowideit, Scott Bessler, Todd Lunter, Vladimir Rutsky, Nicolas Dudebout, Nicolas Dudebout, Roger Peppe, Jerome Petazzoni for your contributions. Today we’re happy to announce Docker 0.6.5. Don’t be fooled by the version number: this is a significant release! Think of it as a preparation for 0.7, which will be even more significant.