Pin to a specific version of docker.

iso/Dockerfile

@@ -1,8 +1,25 @@
-# TODO: Move this to somewhere on GCR and manage tags explicitly instead of relying on latest.
+# TODO: Move this to somewhere on GCR and manage tags explicitly instead of
+# relying on latest.
 FROM boot2docker/boot2docker
 
+# Set the version of Docker.
+RUN echo "1.9.1" > $ROOTFS/etc/version
+
 # Add other dependencies here to $ROOTFS/
 ADD nsenter $ROOTFS/usr/bin/
 
+# Get a specific version of Docker. This will overwrite the binary installed
+# in the base image.
+# The --strip-components=3 flag will have to change as we switch docker versions
+# past 1.10.x. They changed the packaging format slightly.
+RUN rm -f /$ROOTFS/usr/local/bin/docker*
+RUN curl -fSL -o /tmp/dockerbin.tgz https://get.docker.com/builds/Linux/x86_64/docker-$(cat $ROOTFS/etc/version).tgz && \
+    tar -zxvf /tmp/dockerbin.tgz -C "$ROOTFS/usr/local/bin" --strip-components=3 && \
+    rm /tmp/dockerbin.tgz
+RUN $ROOTFS/usr/local/bin/docker -v
+
+# Build the actual iso image
 RUN /make_iso.sh
-CMD ["cat", "boot2docker.iso"]
+
+# Output it to transfer back to the host
+CMD ["cat", "boot2docker.iso"]

iso/README.md

@@ -1,4 +1,16 @@
 # Scripts for building a VM iso based on boot2docker
 
 ## Build instructions
-./build.sh
+./build.sh
+
+## Test instructions
+To manually try out the built iso, you can run the following commands to create a VM:
+
+```shell
+VBoxManage createvm --name testminikube --ostype "Linux_64" --register
+VBoxManage storagectl foo --name "IDE Controller" --add ide
+VBoxManage storageattach foo --storagectl "IDE Controller" --port 0 --device 0 --type dvddrive --medium ./minikube.iso
+VBoxManage modifyvm foo --memory 1024 --vrde on --vrdeaddress 127.0.0.1 --vrdeport 3390 --vrdeauthtype null
+```
+
+Then use the VirtualBox gui to start and open a session.