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February 1, 2019 17:40
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change docker stroage
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Hello all, | |
I have been using Docker with the Devicemapper storage driver. After manually editing the launcher script, I finally took the time to convert to Overlay2. Here are the instructions I took to do this. I hope this helps others. I see others have asked the question 9, but I don’t see any answers. I used this excellent guide 64 to help figure this out. | |
Step 1: Halt your Discourse application (and other docker apps) | |
./launcher stop app | |
Step 2: Commit and save your old Docker containers/images | |
We first committed each image we care for so that we had the most recent version tagged somewhere with all changes included. This can be done roughly like this: | |
docker ps -a | |
# for each container you care for, stop and then commit it | |
docker commit e198aac7112d export/local_discourse_app | |
docker save export/local_discourse_app > export_local_discourse_app.tar.gz | |
Step 3: Change storage driver | |
I chose Overlay2, but the Discourse-recommended driver is aufs. Adjust as necessary. If something goes wrong, simply set the storage-driver to devicemapper as needed. | |
Insert the following into /etc/docker/daemon.json | |
{ | |
"storage-driver": "overlay2" | |
} | |
Step 4: Restart docker | |
sudo service docker restart | |
Step 5: Import image into new storage device | |
docker load < export_local_discourse_app.tar.gz | |
Step 6: Rebuild Discourse | |
./launcher rebuild app | |
I hope this helps! Feel free to suggest any modifications or questions. |
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