Boot2docker: Using nfs instead of vboxsf to mount /Users

After trying to run bitcoind in a docker container on boot2docker and mounting my local ~/.bitcoin directory as a volume I discovered that the file system VirtualBox uses for mounting directories (vboxsf) doesn’t support some operations that LevelDB needs in order to operate.

Unfortunately, at the time of this writing, boot2docker doesn’t have an official way to switch from VirtualBox shared folders to nfs.

Which prompted me to write this short script that does exactly this:

	#!/bin/bash

	#
	# This script will mount /Users in the boot2docker VM using NFS (instead of the
	# default vboxsf). It's probably not a good idea to run it while there are
	# Docker containers running in boot2docker.
	#
	# Usage: sudo ./boot2docker-use-nfs.sh
	#

	if [ "$USER" != "root" ]
	then
	echo "This script must be run with sudo: sudo ${0}"
	exit -1
	fi

	# Run command as non root http://stackoverflow.com/a/10220200/96855
	B2D_IP=$(sudo -u ${SUDO_USER} boot2docker ip &> /dev/null)

	if [ "$?" != "0" ]
	then
	sudo -u ${SUDO_USER} boot2docker up
	$(sudo -u ${SUDO_USER} boot2docker shellinit)
	B2D_IP=$(sudo -u ${SUDO_USER} boot2docker ip &> /dev/null)
	#echo "You need to start boot2docker first: boot2docker up && \$(boot2docker shellinit) "
	#exit -1
	fi

	OSX_IP=$(ifconfig en0 \| grep --word-regexp inet \| awk '{print $2}')
	MAP_USER=${SUDO_USER}
	MAP_GROUP=$(sudo -u ${SUDO_USER} id -n -g)
	RESTART_NFSD=0

	EXPORTS_LINE="/Users -mapall=${MAP_USER}:${MAP_GROUP} ${OSX_IP}"
	grep "$EXPORTS_LINE" /etc/exports > /dev/null
	if [ "$?" != "0" ]
	then
	RESTART_NFSD=1
	# Backup exports file
	$(cp -n /etc/exports /etc/exports.bak) && \
	echo "Backed up /etc/exports to /etc/exports.bak"
	# Delete previously generated line if it exists
	grep -v '^/Users ' /etc/exports > /etc/exports
	# We are using the OS X IP because the b2d VM is behind NAT
	echo "$EXPORTS_LINE" >> /etc/exports
	fi

	NFSD_LINE="nfs.server.mount.require_resv_port = 0"
	grep "$NFSD_LINE" /etc/nfs.conf > /dev/null
	if [ "$?" != "0" ]
	then
	RESTART_NFSD=1
	# Backup /etc/nfs.conf file
	$(cp -n /etc/nfs.conf /etc/nfs.conf.bak) && \
	echo "Backed up /etc/nfs.conf to /etc/nfs.conf.bak"
	echo "nfs.server.mount.require_resv_port = 0" >> /etc/nfs.conf
	fi

	if [ "$RESTART_NFSD" == "1" ]
	then
	echo "Restarting nfsd"
	nfsd update 2> /dev/null \|\| (nfsd start && sleep 5)
	fi

	sudo -u ${SUDO_USER} boot2docker ssh << EOF
	mount \| grep nfs > /dev/null && \
	echo "/Users already mounted with NFS" && \
	exit
	echo "Unmounting /Users"
	sudo umount /Users 2> /dev/null
	echo "Starting nfs-client"
	sudo /usr/local/etc/init.d/nfs-client start 2> /dev/null
	echo "Mounting /Users"
	sudo mount $OSX_IP:/Users /Users -o rw,async,noatime,rsize=32768,wsize=32768,proto=tcp,nfsvers=3
	echo "Mounted /Users:"
	ls -al /Users
	exit
	EOF

view raw boot2docker-use-nfs.sh hosted with ❤ by GitHub

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