Scott Ford Docker for Mac - Safely reset from factory defaultsHere are the steps Ive done so far: On my Local machine (macbook running Docker version 1. The Docker menu () displays the Docker Subscription Service. In the example below, the Applications folder is in grid view mode. Double-click Docker.app in the Applications folder to start Docker. Double-click Docker.dmg to open the installer, then drag the Docker icon to the Applications folder. Install and run Docker Desktop on Mac.
![]() Run Docker Default With Docker How To Backup AndAssumptionsFor these instructions, I’m assuming that you’re working with a project using docker-compose, and that you want to make sure that your images don’t have to be rebuilt, and the data in your volumes is preserved.I’m also assuming that your version of Docker for Mac (and related tools) is compatible with the version that I was using when I wrote this. I ran into some problems with those steps, so I thought I’d put together a more concise recipe here. This completely wipes out any data that’s stored in your containers and volumes, so there were some instructions on how to backup and restore your information. I’m not using Docker for Mac for any production workloads, just development environments, but I wanted to go ahead and do the extra work to try and avoid any data corruption.In order to trigger the change, the release notes mentioned performing the “Reset from factory defaults” option in the Docker for Mac preferences window.![]() The easiest way to see the full names is by running docker-compose ps. Docker Compose does the hard work of giving each container a unique container name within the Docker engine. When working with docker-compose, you can use the names of the services that are specified in the docker-compose.yml file. One such complexity is the full name of each of your containers. This isn’t specifically required for backing up your container images, but it makes life a lot easier.Here’s what my docker-compose.yml file looks like:Command: bundle exec rails s -p 80 -b '0.0.0.0'Command: bundle exec script/delayed_job runDocker-compose hides some of the complexities of working directly with the docker command. This is done differently with newer versions of the docker-compose.yml file format. Identify Your VolumesIn my docker-compose.yml file above, I’m using two containers to house volumes. As you can see from the output above, they are usually formatted as a combination of the current directory name ( cbits-spree-ecom in my case), the service name, and a number which will only be greater than 1 if you have more than one instance of a container running. Exit 1You’ll need to refer to these names in future steps. Exit 1Cbits-spree-ecom_worker_1 /app/docker-entrypoint.sh. Up 0.0.0.0:32770->6379/tcpCbits-spree-ecom_web_1 /app/docker-entrypoint.sh. ![]() This one will be the current directory outside of the container (on our host system) and will be mounted at /backup inside the container.We’re asking docker to run an instance of the container image named ubuntu.Tar cvf /backup/var-lib-postgresql.tar /var/lib/postgresql/We’re asking docker to run the tar command inside the container that we’ve asked it to start. This is the container that we want, because it’s the one that has access to the data that we want to back up.We’re asking docker to add an additional volume. The volumes will all be mounted in the places that we’d expect them to be if we were running a copy of the db container directly. Strengthsfinder 20 access code crackThis is what will give us access to the data from outside of the container.Now that we’ve dug into that, it should be easier to understand the command to back up the bundle volume below.Here’s the command to back up the bundle volume.5f70bf18a086: Loading layer 1.024kB/1.024kBDc7818f0ad09: Loading layer 128.6MB/128.6MBF134fec9a99e: Loading layer 45.2MB/45.2MBC5bfde1f7499: Loading layer 126.3MB/126.3MBA1978924e1a2: Loading layer 398.2MB/398.2MBE1767f2cda17: Loading layer 53.07MB/53.07MB85920dc2fe27: Loading layer 2.56kB/2.56kB32e8739e3478: Loading layer 3.932MB/3.932MB7997c9222b4b: Loading layer 100.1MB/100.1MB7bca91565aa1: Loading layer 51.77MB/51.77MBBa78842082e1: Loading layer 1.536kB/1.536kB7c4e1d775dce: Loading layer 141.8MB/141.8MB4b4242736321: Loading layer 2.048kB/2.048kB05a249cfdf41: Loading layer 4.608kB/4.608kBFa7a04b08c93: Loading layer 4.608kB/4.608kB113ef05337b2: Loading layer 2.56kB/2.56kBB2f41a89f721: Loading layer 4.608kB/4.608kBC8d2f35661db: Loading layer 5.632kB/5.632kBFc31ff4e2304: Loading layer 5.12kB/5.12kB34b1e2bb4799: Loading layer 3.072kB/3.072kBF4ea0bb3d9d4: Loading layer 219.7MB/219.7MB15f5fc64d554: Loading layer 2.56kB/2.56kBF3bcfbfd3f07: Loading layer 8.564MB/8.564MB100a53ab6e1a: Loading layer 26.62kB/26.62kBE6b8421838b1: Loading layer 23.04kB/23.04kBWe’re asking docker to load container images that we saved using the docker save command.We’re asking docker to read from the spree-app.tar file to load the container image.Create Your Containers from the Restored Container ImagesNow that we’ve restored the container images, we need to ask docker-compose to create the containers that we’ve specified in our docker-compose.yml file.We’re asking docker to delete the container when we’re done with it.We’re asking docker to use the volumes from the db container in our docker-compose.yml file.We’re asking docker to mount our current directory, $(pwd), from outside of the container (which contains our backup files) at /backup inside the container.We’re asking docker to run an instance of the ubuntu container.Tar xvf /backup/var-lib-postgresql.tar var/lib/postgresqlThis is the command that extracts our backup and puts all of the data back where it came from.Now that we’ve gone over the details of that command, we can restore the bundle volume. It’s going to read the contents of our volume and archive them in a tar file inside the /backup directory (which is also the current directory outside of the container).
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