Currently, more than a million Dockerfiles are on GitHub. What is a Dockerfile?Ī Dockerfile is just a blueprint that contains the instructions to build a Docker image. It is represented as a list of instructions (known as layers) in a filesystem. What is a Docker image?Ī Docker image is a template that allows you to instantiate running containers. Let's review some of the basic concepts before you start to put them into practice. This guide assumes you are familiar with Docker and its build environment. Refreshing basic concepts about Docker images and Dockerfiles To do that, I have provided you with a GitHub repository that contains all the files you need, to follow the tips and tricks shown in this post. Then, I will walk you through some practical examples, to improve the build time, the size, and the security of a Docker image. First, I will briefly explain some basic concepts that you need to refresh before examining specific cases. In this tutorial, I will go over these lessons learned, describing some of the best practices and common pitfalls that you are likely to encounter when developing Dockerfiles, by applying them on practical examples. As part of the team which maintains a container catalog with more than 130 apps, I have worked on adapting the containers and their Dockerfiles to meet the community requirements. Now that you’ve installed Metabase, it’s time to set it up and connect it to your database.Since Bitnami published its first Docker container in 2015, the techniques for writing Dockerfiles have significantly evolved. See Running Metabase in the Troubleshooting guide. In order for the Metabase container to read the files and use the contents as a secret, the environment variable name needs to be appended with a “_FILE” as explained above. We currently support the following environment variables to be used as secrets:
POSTGRES_PASSWORD_FILE: /run/secrets/db_password MB_DB_PASS_FILE: /run/secrets/db_password Notice the “_FILE” on the environment variables that have a secret): Put the db_user in the db_user.txt file, and db_password in the db_password.txt file. These files should be in the same directory as the docker-compose.yml. In addition to this example yml file, you’ll need to create two files: Here is an example docker-compose.yml file to start a Metabase Docker container with secrets to connect to a PostgreSQL database. In order to keep your connection parameters hidden from plain sight, you can use Docker Secrets to put all parameters in files so Docker can read and load them in memory before it starts the container.
Use Docker Secrets to hide sensitive parameters
Docker run image daemon expose port drivers#
Note that Metabase will use this directory to extract plugins bundled with the default Metabase distribution (such as drivers for various databases such as SQLite), thus it must be readable and writable by Docker. mount type=bind,source=/path/to/plugins,destination=/plugins \
Docker run image daemon expose port how to#
Here’s how to use a database file, owned by your account and stored in your home directory: These settings make it possible to match file permissions when files, such as the application database, are shared between the host and the container. In addition to the standard custom settings there are two docker specific environment variables MUID and MGID which are used to set the user and group IDs used by metabase when running in a docker container. You can use any of the custom settings from Customizing the Metabase Jetty Webserver by setting environment variables in your Docker run command.
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