Attention: IBM now provides a Docker image for DB2 on Docker Hub. You're probably better off using that one.

pre-requisites

It seems like DB2 doesn't like running on the AUFS back-end, so you should switch to devicemapper instead.

Maybe this is an unrealistic request, I'm not sure.

boot2docker

boot2docker is cool, but it hides your docker settings away, so in order to switch to the devicemapper backend you would do:

boot2docker ssh

(inside boot2docker)

sudo echo EXTRA_ARGS="--storage-driver=devicemapper" > \
    /var/lib/boot2docker/profile

(ctrl-d to exit)

boot2docker restart

Also, hit up boot2docker ip for the ip address -- you'll need that later.

build

docker build -t db2-express-c .
docker run -P --privileged=true -it db2-express-c

(inside docker)

./prepare.sh

This will start the DB2 instance and create a sample database.

(back in the shell)

docker ps | grep db2-express-c:0.0.1

(note hash, e.g. e001bc1de596)

docker stop e001bc1de596
docker commit e001bc1de596 db2-express-c:0.0.2

Thanks to rieske for the build script.

run

it's kind of a doozy:

docker run --privileged=true -P -t -d -u db2inst1 jeffbonhag/db2-express-c:0.0.1 /bin/bash -c "source ~/sqllib/db2profile && db2start && read -p Waiting..."

login!

username: db2inst1
password: db2inst1
host: localhost (or whatever `boot2docker ip` told you)
port: what `docker ps` said
database: SAMPLE

That's all!