Using Overlay file system with Docker on systemd Ubuntu (14.10+)
24Dec15
Back in March I wrote about Using Overlay file system with Docker on Ubuntu – those instructions applied to Ubuntu before the switch to systemd e.g. 14.04 and earlier.
The move to systemd means that changes to /etc/default/docker don’t have any effect any more.
To get systemd to dance along to our tune needs a file like this:
/etc/systemd/system/docker.service.d/overlay.conf
[Service] ExecStart= ExecStart=/usr/bin/docker daemon -H fd:// --storage-driver=overlay
To make this work use the following script (or get it from gist to avoid silly copy/past replacement of < with <):
sudo mkdir /etc/systemd/system/docker.service.d sudo bash -c 'cat <<EOF > /etc/systemd/system/docker.service.d/overlay.conf [Service] ExecStart= ExecStart=/usr/bin/docker daemon -H fd:// --storage-driver=overlay EOF' sudo systemctl daemon-reload sudo systemctl restart docker
Now when you run ‘sudo docker info’ you should see something like:
... Storage Driver: overlay Backing Filesystem: extfs ...
At least you didn’t need to upgrade the kernel this time – small mercies.
NB this is somewhat (inaccurately right now) documented in Control and configure Docker with systemd – I can feel a PR coming on.
Filed under: Docker, howto | 1 Comment
Tags: Docker, file system, overlay, systemd, Ubuntu
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