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CircleCI provides pre-built images for languages and services like databases with a lot of conveniences added into the images on CircleCI Docker Hub.css-1ie5e7y{display:inline-block;width:1rem;height:1rem;margin-left:-5px;}. To persist the data, we will use a Docker volume. This guide, as well as the rest of our docs, are open source and available on GitHub. Installing packages in images requires administrator privileges, therefore sudo is used - a password is not required. Copy rest of the files into the container. # For example, a service, a server, a client, a database # We use the keyword 'services' to start to create services. If you're here today, it's because you probably need it in your project! Let's see what is in the database; One may ask why? I'm helping people grow into Web Development by sharing resources and tips on my Twitter account. The Python image has pip installed and -browsers for browser testing. Contact our support engineers by opening a ticket. I like to use containers for some of my tools. Check my blog again for next post about some tips for working with migrations! Create Dockerfile in the DbMigrator project like the following: It's easy one. Run dotnet run we should see this: We can connect to docker container again and list databases as described in previous point. Let's get our hands dirty again. I have also used EnsureDatabase what is fine for local development but remember that for other environments you should create the database before with all necessary settings (collation, security, connlimit etc). Create other docker-image with netcore and DbMigrator. This guide, as well as the rest of our docs, are open source and available on, To report a problem in the documentation, or to submit feedback and comments, please. There is no long-running process that docker can attach to (some kind of web listener on specific port). Just run docker-compose up -d. I have this output: Where is our migrator? Or to spin up some 3rd party service which don't need your migrations but needs postgres). # Its syntax is as follows: [folder path on our machine]:[folder path to retrieve in the container]. Do you want to grow into Web Development? This image will simplify the job by providing all the dependencies to run Postgres in Docker. Check the docs to find out more. What's going on? You should be able to use SqlServer in very similar way - just change the db service in compose file, Program.cs of DbMigrator to work with SqlServer and of course connection string. Thanks to this approach you can upgrade your databases without db downtime. It supports: The assumption around this library is straightforward. By default, the Postgres data will be only in the container. For example, your PostgreSQL container might be running, but might not be ready to accept connections. Example scripts looks like this: Having those things let's run the migrator again. We already can run DbUp using dotnet CLI against dockerized postgres. Set the POSTGRES_USER environment variable in your CircleCI config to postgres to add the role to the image as follows: The steps run checkout first, then install the Postgres client tools. When I'm working on a new project, I like to have a clean environment. To test your database, you should connect to it using the software or programming language of your choice. These are SQL commands that create a table called test and insert a value into that table. Feel free to use it for your projects! In the primary image, the config defines an environment variable with the environment key, giving it a URL. The main two steps of the configuration will be: Below, you will find the Docker Compose file. If you're not family with Docker yet, I recommend you to read my two previous articles. When the database service spins up, it automatically creates the database circle_test and the postgres role that you can use to log in and run your tests. PostgreSQL is one of the most used database engines nowadays. Following is an example of how to do this in your CircleCI config.yml file: It is possible to apply the same principle for the following databases: dockerize -wait tcp://localhost:3306 -timeout 1m, dockerize -wait tcp://localhost:6379 -timeout 1m, sudo apt-get install redis-tools ; while ! GitHub: Postgres Docker Compose example (ready to use). As a reminder, the Postgres database is accessible on localhost with the port 5432. This pre-built circleci image includes a database and a user already. Navigate to new project fodler and add two packages. Set the default parameters which will be passed to running container and run command with shell (by involving shell we can make use of env variables). This section describes additional optional configuration for further customizing your build and avoiding race conditions. Storing the database in a ramdisk may improve performance. Let's check the compose logs using docker-compose logs. It is still possible without DbUp being dockerized but the CI scripts are growing with more and more commands. It will share the database date inside of your container with a local folder of your computer. After committing changes and pushing them, the build is automatically triggered on CircleCI and spins up the primary container. Add more layers on top of postgres image. Let's check if this works. then it should run db container first as this is its upstream dependency. Everything is according to dbup documentation. This can be done by setting the PGDATA: /dev/shm/pgdata/data environment variable in the service container image config. One of the things I dislike the most is installing "big" tools on my computers (for example, a database engine). To reach your goal of creating a Postgres Docker Compose file, we will use the image for PostgreSQL available on Docker Hub. In short (number contains script line numbers): Line 3-4 embrace docker layers caching so we don't need to restore the packages each time we edit a DbMigrator source file. To do that, you can add the database section in the services node of your Docker Compose. # Note: You are free to change your computer's port, # but take into consideration that it will change the way, # The PostgreSQL user (useful to connect to the database), # The PostgreSQL password (useful to connect to the database), # The PostgreSQL default database (automatically created at first launch), # The `env_file` tag allows us to declare an environment file, # The name of your environment file (the one at the repository root). # we must share the port with our computer's port. Is here: https://github.com/marcingolenia/postgres-dbup. This document describes how to use the official CircleCI pre-built Docker container images for a database service in CircleCI. So, you can begin with using that user and database without having to set it up yourself. The username is postgres and database is circle_test. This file is called docker-compose.yml, and you can make it at your project's root. CircleCI is always seeking ways to improve your experience with our platform. It is really easy to docker-compose down and docker-compose up and have everyting fresh. You should be able to use postgres in your docker-compose by other services without waiting to some migrations to apply (for example to run migrations for other database. # Official Postgres image from DockerHub (we use the last version). CircleCI Documentation by CircleCI is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. So we already have a postgres instance running in docker container and we are able to incrementally apply migrations using DbUp. # We use '3' because it's the last version. One command is enough to set up a Postgres database in Docker from scratch with new parameters. When it comes to DbUp it is a .NET Library that helps you deploy changes to your SQL database. If you want that your Postgres Docker Compose find the environment variables, you should add the following lines: Your Docker Compose will use the environment variables defined inside the .env to configure the database. To use pg_dump, pg_restore and similar utilities requires some extra configuration to ensure that pg_dump invocations will also use the correct version. I made some minor changes as the main example on the docs is for sqlserver. Work around this problem by using dockerize to wait for dependencies. If you want to read and use the complete Postgres Docker Compose example, I've hosted the code on my Github. # By default, a Postgres database is running on the 5432 port. I won't introduce you to docker or Postgres - you should have some basic knowledge in this area although I will follow you with every step. When you finish working on your project, I recommend you to stop the running Postgres Docker container using the command below: Once you want to work again on your project, you can use docker-compose up again to run your database. Let me show you how you can combine PostgreSQL, Docker and DbUp to create pleasant and quick database development environment without installing anything (besides docker of course). First navigate to the directory with your docker-compose.yml and run dotnet new console -o DbMigrator or any other name. This file should be named .env, and it should be located at the root of your repository with your Docker Compose. Works for me: Let's add 2 basic sql scripts to create simple tables: Set the script files as embedded ressources. Postgres didn't make it to be up sooner than migrator so the connection was refused. You can find the connection information (the username, the password, and the default database). The Migrator was deployed and exited so the container lifecycle ended. If you decide to delete the container, all the data are going to disappear definitively. The URL tells it that it is a PostgreSQL database, so it will default to the PostgreSQL default port. This is a game changer when you want to run integration-tests. # A Docker Compose must always start with the version tag. 2022 Circle Internet Services, Inc., All Rights Reserved. The depends_on tells docker that even if we decide to run this command: docker-compose up -d db-migrations No magic here. Use \c dbname to connect to specific database. Docker society (and the docker team) advises to not create monolithic Dockerfiles (so containing multiple tech things). # but you can use the name of your choice. As an example I will create random database. If you would like to share feedback, Our support engineers are available to help with service issues, billing, or account related questions, and can help troubleshoot build configurations. The first step consists of creating the configuration file to run Postgres in Docker. Let's start with simple docker-compose.yml: Having that file let's just run command docker-compose up -d. Now we can verify if docker container with postgres is running on the default port with docker ps. With this first version of your Postgres Docker Compose file, you will be able to run the database and connect to it! As I explained in the Postgres Docker Compose comments, the environment variables are defined in the environment part of the configuration. redis-cli ping 2>/dev/null ; do sleep 1 ; done, dockerize -wait http://localhost:80 -timeout 1m. This tutorial teaches you how to create a Postgres Docker Compose file. The layers will contain netcore and DbMibrator. Before running your file, I want to share with you some optional configurations. Docker Compose will do it for you. Think for a while this should make sense! I've something for you. Hey, psst! The configuration file will be detailed line per line, so you will be able to test it and configure it for your needs. Refer to the Database Configuration Examples document for additional configuration file examples. . I'm not going to lie, I'm not constantly moving all my environments to Docker, but I like to have a part of it in a dedicated one. See the Build Specific Environment Variables document for details. # In this example, we share the folder `db-data` in our root repository, with the default PostgreSQL data path. That's bad. The following example shows a .circleci/config.yml file with one job called build. You can do it in your IDE or in csproj. Each line is commented on so that you can understand the purpose of each instruction. Let's create new netcore console app. # The syntax is [port we want on our machine]:[port we want to retrieve in the container]. These steps are not mandatory, and to keep the Postgres Docker Compose example simple, we will not use them at the tutorial end. # You don't need to create the `db-data` folder. For example, for Python, you might install psycopg2 so that you can interface with the PostgreSQL database. In the root of your project repository, type the following command to install the dependencies and run your database: That's it; everything is set up! The first image is the programming language Python. import the Postgres image in the Docker Compose, configure the database to fit your needs and use it on your computer. Note: CircleCI injects a number of convenience environment variables into the primary container that you can use in conditionals throughout the rest of your build. Multiply this act by few times per day and you can save some time for coffee! I tend to use the second approach. If you don't want to put your environment variable in your Docker Compose file, you can create an environment file at your project root. Add the following to your config.yml file to enable pg_* or equivalent database utilities: Using multiple Docker containers for your jobs may cause race conditions if the service in a container does not start before the job tries to use it. Two commands follow the postgresql-client installation that interact with the database service. # Note: This may change the commands you are going to use a little bit. For example, CIRCLE_NODE_INDEX and CIRCLE_NODE_TOTAL are related to concurrent execution environments. Once you created the Docker Compose file, your folder architecture should be similar as below. With good docker-compose you simply don't have to worry about that. Everything you have to do is docker-compose up and you are ready to go with all your databases + schema up to date! The service image gives access to additional services like databases. It means that everytime you will re-build your Postgres Docker Compose, these same data will be used for the current project. Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. to find support articles, community forums, and training resources. As I mentioned before, one of the advantages of using Docker Compose for Postgres is to avoid background processes on your computer. Learn to code with simple and concrete examples. Contact our support engineers by. Docker is selected for the executor and the first image is the primary container where all execution occurs. It embraces transitions instead of "state". The cimg/postgres:14.0 image doesnt install any client-specific database adapters. "Host=localhost;User Id=postgres;Password=Secret!Passw0rd;Database=crazy_database;Port=5432", "Server=localhost,1433;Initial Catalog=TravelServicesConsumer;User ID=sa;Password=Strong!Passw0rd;MultipleActiveResultSets=True;Connection Timeout=30;", 'DbMigrator.SqlScripts.001_AddTable_Customer.sql', 'DbMigrator.SqlScripts.002_FillSampleData.sql', "dotnet DbMigrator.dll \"${DB_CONNECTION}\"", https://github.com/marcingolenia/postgres-dbup. We can list databases using \l command or use sql to do whatever we wnat. In this part, I will show you how to create a Postgres Docker Compose example. # If we want to access the database from our computer (outside the container). First let's check for running containers: Let's enter containers bash and check the db schema: One thing you may run into when playing with docker: Just add .dockerignore file with this content: And you are good to go (we've just ignored some visual studio internal things from docker commands ie copy). # You should know that Docker Compose works with services. Also when I write integration tests I tend to play with database causing some rubbish data. With one command, you can also shut down all the environment and free your computer from work. Let dbup create the crazy_database for us. If you don't have any project yet, you can do it in a new folder on your computer. Use \q command to exit psql and of course ctr+d combination to leave container in detached mode. # of `/var/lib/postgresql/data/`, automatically the change will appear in `db-data`. # It means that every time the repository is modifying the data inside. We welcome your contributions. Then the database tests run to create a table and insert a value into it. After we enter interactie mode let's run psql -U postgres. In this example, the config installs the PostgreSQL client tools, postgresql-client via apt-get, to get access to psql. Our support engineers are available to help with service issues, billing, or account related questions, and can help troubleshoot build configurations. This example has a second image and this will be used as the service image. They will teach you all the necessary knowledge to understand this tutorial to run Postgres in Docker. It creates a version table to keep track which scripts were executed and applies new ones incrementally. The container with DbMigrator will reach postgres apply migration and exit automatically. If you copy/paste the environment variables from the Docker Compose file to your .env file, you will have the following: Once you did it, it means your environment part isn't used anymore so that you can remove it. This is a good start but when your app is growing and contains different services with different databases this really simplifies your life. You can use your IDE but I will stick with CLI for now. You should see this: So once we have postgres up and running we can play a little bit with it by connecting to the container using docker exec -it a74 bash (make sure to enter yours container id). The example you will build comes with an initial configuration for your projects. # The `volumes` tag allows us to share a folder with our container. Let's add restart on-failure policy to compose yml file: Let's run everything again. See Pre-Built CircleCI Services Images for the list of images. Now it is time to update our compose-file. You can also visit our support site to find support articles, community forums, and training resources. The cimg/postgres Docker image uses regular persistent storage on disk. Perfect! I hope you will enjoy this way of database development. Time to run the app! If your are not sure what is going on you should definetely check the docker docs. Nowhere.

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