51 lines
1.9 KiB
Markdown
51 lines
1.9 KiB
Markdown
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MariaDB Container Set
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=====================
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The MariaDB database application has been organized into two containers,
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known as a [container-set][] within the Kolla project. One container runs
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the MariaDB application and the other stores the actual data.
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Operational efficiencies and service stability is provided by
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separating the application from the stored data. For example, stored data
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can be backed-up or restored without touching the MariaDB application
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component.
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The containers work in a cooperative fashion by using [docker-compose][]
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(aka Fig) to ensure the containers are co-located on the same host.
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With docker-compose, you can manage the containers collectively
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as a single unit.
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Here is a sample docker-compose yaml file for using both MariaDB containers:
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```
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mariadbdata:
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image: kollaglue/centos-rdo-mariadb-data
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volumes:
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- /var/lib/mysql:/var/lib/mysql
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- /var/log/mariadb:/var/log/mariadb
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net: "host"
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privileged: true
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mariadbapp:
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image: kollaglue/centos-rdo-mariadb-app
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env_file:
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- openstack.env
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volumes_from:
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- mariadbdata
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net: "host"
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ports:
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- "3306:3306"
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privileged: true
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```
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In addition to the MariaDB application being organized across two containers, the data
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container follows the [data-only container][] design pattern. In this design pattern,
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a dedicated container is used to perform a host mount and separate application
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container(s) mount volumes from the data-only container instead of performing the host
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mount directly. In the example above, the MariaDbApp container mounts the /var/lib/mysql
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and /var/log/mariadb volumes through the MariaDbData container instead of mounting
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these directly to the Docker host.
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[docker-compose]: http://www.fig.sh/
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[container-set]: https://review.openstack.org/#/c/153798/
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[data-only container]: http://www.tech-d.net/2013/12/16/persistent-volumes-with-docker-container-as-volume-pattern/
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