We can configure daemon flags and environment variables.It is an easy way to control the Docker service.Sudo systemctl show -property=Environment docker We can use the below command to verify the configuration has been loaded, and it is the same as expected: – We need to reload the daemon as we have created a new systemd file and restart the docker service to apply this new configuration as shown below: –ĥ. Let’s verify the changes by running the ‘docker info’ command once again:Ĥ. Tip: Wait for 1-2 mins after making changes to the file, and then restart the service.Ĥ. Note: You will get an error as shown below in the snapshot while restarting the docker daemon if the ‘daemon.json’ file is improper or missing something, so re-check the ‘daemon.json’ file and restart the service.Įxplanation: In the above snapshot, we can see that it encountered an error in the first attempt, so recheck the ‘daemon.json’ for any error and fix it and then restart the service again without any error. We have to restart the Docker service using systemctl command to apply the new configuration as shown below: – Now, edit the ‘daemon.json’ file or create it if it does not exist already, as shown below: –ģ. Let’s check the current configuration of the Docker daemon by running the ‘docker info’ command as below: –Ģ. Let’s understand how we can configure Docker daemon flags or environment variables with the below examples: – Scenario 1: Change the default logging driver to json-file and runtime directory to “/mnt/docker-data”ġ. We need to create a systemd drop-in directory for the docker service and create a configuration file inside it. We must restart the Docker service after changing the ‘daemon.json’ file to enforce the changes.Īlmost all daemon configuration options can be configured using ‘daemon.json’ however, we can not configure the ‘HTTP proxy’ option using ‘daemon.json’. We have to create this file when we configure daemon flags or environment variables the first time. The default path of this file is ‘/etc/docker,’ and it does not exist when we install Docker. We can configure the daemon flags and environment variables for our Docker daemon in different ways however, the recommended way to configure daemon flags and environment variables is to use the platform-independent file that is ‘daemon.json’. Explanation: In the above snapshot, we can see that the docker service is running and is enabled.
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