Set the default size for new Docker for Mac disk images
UPDATE: The instructions here are no longer necessary! Resizing the disk image is now possible right from the UI since Docker for Mac Version 17.12.0-ce-mac49 (21995).
If you are getting the error:
No space left on device
Configuring the qcow2 size cap is possible in the current versions:
# my disk is currently 64GiB $ /Applications/Docker.app/Contents/MacOS/qemu-img info ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/Docker.qcow2 image: /Users/djs/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/Docker.qcow2 file format: qcow2 virtual size: 64G (68719476736 bytes) disk size: 28G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: true refcount bits: 16 corrupt: false # I can increase or decrease the default cap by: $ cd ~/Library/Containers/com.docker.docker/Data/database/ $ git reset --hard HEAD is now at 8635944 last-start-time changed at 1480009710 # The com.docker.driver.amd64-linux/disk/size file (and the disk dir) may not exist. If they don't exist create them. $ cat com.docker.driver.amd64-linux/disk/size 65536 $ echo 131072 > com.docker.driver.amd64-linux/disk/size $ git add com.docker.driver.amd64-linux/disk/size $ git commit -s -m 'increase size to 128GiB' [master 60861de] increase size to 128GiB 1 file changed, 1 insertion(+), 1 deletion(-) # delete the disk -- this unfortunately deletes all images and containers $ rm ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/Docker.qcow2 # now I need to restart the app
For anyone wanting to use an external drive, you can also change the location of the Docker.qcow2 by editing the database key com.docker.driver.amd64-linux/disk/path. There is no UI element for this yet.
Credit for this procedure goes to @djs55 and was taken from https://github.com/docker/for-mac/issues/371#issuecomment-262826610 .