![]() You can build a custom container image with the settings set inside the container. There’s another way that you can inject configuration into your containers. You can, of course, hop into the container with docker exec and edit the config, or edit it on the base file system. Again, if you need to make a change, you’ll edit the file, copy it into the container, and restart it. Be sure to check out the Docs to see what you can configure. This method is excellent if you have a more complex configuration, perhaps TLS certificates, Active Directory configurations, and so on. sqlcmd -S localhost,31433 -U sa -Q 'DBCC TRACESTATUS ' -P Status Global Session docker exec sqldemo1 cat /var/opt/mssql/nfĪnd now let’s ask SQL Server what it thinks its configuration is…and there we have trace flag 3226 configured again. With the container up and running, let’s check if our nf file inside the container is the one we want…and in the output below, you can see that’s the case. mssql/server:2019-CU11-ubuntu-18.04Īnd now copy our nf file into the container at the location SQL Server expects the file to be located at /var/opt/mssql and start up the container with docker start docker cp nf sqldemo1:/var/opt/mssql So let’s create that container… docker container create \ We don’t want to start the container right now because we first want to copy the nf file in into the container volume and then start the container so SQL Server can use the nf file for its configuration. This will create the container and the volume at the same time. Let’s use docker create to create the container. Now, rather than use docker run to create and start the container. In our example here, we’re setting a trace flag again. Check out the Docs for more details on what to configure and how to configure it. You can make this as customized as needed. Let’s get started…įirst, we need an nf file, and here is a straightforward example. You can quickly change the configuration file and restart the container to load the new configuration using this method. Using this method, you’re decoupling the configuration of the container from its definition. Let’s do the same thing again, but this time let’s configure SQL Server running in a container with an nf configuration file. docker rm -f sqldemo1Ĭreating and Running a Container with a nf Configuration File This code will delete your container and your volume. Let’s clean up from this demo and move on to the following example. If you want to remove it, you will need to delete the container and recreate it…but that’s ok if you use a Volume to persist your data independent of the container’s lifecycle. This configuration is now part of the container’s definition and is forever tied to the container’s lifecycle. detach /mssql/server:2019-CU11-ubuntu-18.04 /opt/mssql/bin/sqlservr -T 3226Īfter starting our container, let’s ask SQL Server about its currently configured trace flags…and in the output below, you can see the trace flag 3226 is configured. Let’s check out the code for this… docker run \ So when this container starts up it will start the sqlservr executable with the -T 3226 parameter. ![]() I’m configuring a trace flag by setting the correct parameters for the sqlservr executable. In Docker you can override the command of a container at the command line so we can start up a container with the correct executable and parameters. ![]() Let’s go! Starting a Container with a Trace Flagįirst up, let’s configure a container at runtime using Database Engine Service Startup Options. Second, we’re going to inject a configuration file into our container to configure SQL Server. First, we will configure a container at runtime by overriding the default docker command for the container and setting Database Engine Service Startup Options. In this blog post, we will walk through a few examples of how to configure SQL Server in Docker Containers. ![]()
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