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# Running Roundcube in a Docker Container
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The simplest method is to run the official image:
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```
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docker run -e ROUNDCUBEMAIL_DEFAULT_HOST=mail -d roundcube/roundcubemail
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```
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## Configuration/Environment Variables
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The following env variables can be set to configure your Roundcube Docker instance:
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`ROUNDCUBEMAIL_DEFAULT_HOST` - Hostname of the IMAP server to connect to
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`ROUNDCUBEMAIL_DEFAULT_PORT` - IMAP port number; defaults to `143`
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`ROUNDCUBEMAIL_SMTP_SERVER` - Hostname of the SMTP server to send mails
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`ROUNDCUBEMAIL_SMTP_PORT` - SMTP port number; defaults to `587`
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`ROUNDCUBEMAIL_PLUGINS` - List of built-in plugins to activate. Defaults to `archive,zipdownload`
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`ROUNDCUBEMAIL_UPLOAD_MAX_FILESIZE` - File upload size limit; defaults to `5M`
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By default, the image will use a local SQLite database for storing user account metadata.
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It'll be created inside the `/var/www/html` volume and can be backed up from there. Please note that
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this option should not be used for production environments.
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### Connect to a MySQL Database
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The recommended way to run Roundcube is connected to a MySQL database. Specify the following env variables to do so:
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`ROUNDCUBEMAIL_DB_TYPE` - Database provider; currently supported: `mysql`, `pgsql`, `sqlite`
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`ROUNDCUBEMAIL_DB_HOST` - Host (or Docker instance) name of the database service; defaults to `mysql` or `postgres` depending on linked containers.
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`ROUNDCUBEMAIL_DB_USER` - The database username for Roundcube; defaults to `root` on `mysql`
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`ROUNDCUBEMAIL_DB_PASSWORD` - The password for the database connection
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`ROUNDCUBEMAIL_DB_NAME` - The database name for Roundcube to use; defaults to `roundcubemail`
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Before starting the container, please make sure that the supplied database exists and the given database user
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has privileges to create tables.
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Run it with a link to the MySQL host and the username/password variables:
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```
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docker run --link=mysql:mysql -d roundcube/roundcubemail
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```
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### Advanced configuration
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Apart from the above described environment variables, the Docker image also allows to add custom config files
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which are merged into Roundcube's default config. Therefore the image defines a volume `/var/roundcube/config`
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where additional config files (`*.php`) are searched and included. Mount a local directory with your config
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files - check for valid PHP syntax - when starting the Docker container:
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```
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docker run -v ./config/:/var/roundcube/config/ -d roundcube/roundcubemail
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```
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Check our wiki for a reference of [Roundcube config options](https://github.com/roundcube/roundcubemail/wiki/Configuration).
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## Building a Docker image
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Use the `Dockerfile` in this directory to build your own Docker image.
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It pulls the latest build of Roundcube Webmail from the Github download page and builds it on top of a `php:7.1-apache` Docker image.
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Build it from this directory with
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```
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docker build -t roundcubemail .
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```
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