Add docker relocation service

scripts/install_client.sh

@@ -116,6 +116,9 @@ if ! test -v PERSISTENT; then
 	# Disable user password
 	passwd -d student
 
+	# Enable docker relocation
+	systemctl enable mount-docker
+
 	# Remove tty
 	cat <<-EOF>> /etc/systemd/logind.conf
 	NAutoVTs=0

scripts/system/etc/systemd/system/mount-docker.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Docker relocation
+Before=docker.service
+
+[Service]
+ExecStart=/usr/local/bin/mount-docker.sh
+Type=oneshot
+
+[Install]
+RequiredBy=docker.service

scripts/system/usr/local/bin/mount-docker.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Unofficial Bash Strict Mode
+set -euo pipefail
+IFS='
+'
+
+cp -a /var/lib/docker /tmp
+mount -t tmpfs -osize=2G tmpfs /var/lib/docker
+mv /tmp/docker/* /var/lib/docker