Using data containers #1
Description
It's possible to create a database instance with a named data container using dmysql-server --with-volume but this always seems to try to create a new data container, and I don't see a way to connect to a pre-existing container of the same name, which might help portability?
That is, we are forced into running:
docker run -v /var/lib/mysql --name [CONTAINER_VOLUME_NAME] ...
docker run --volumes-from [CONTAINER_VOLUME_NAME] ...
as a bound together pair of instructions.
Would it also make sense to add another flag --volumes-from and use this as a basis for mounting data from a pre-existing container? Perhaps something like:
def getDataVolumeName(containerName):
# Create the container name variable
return containerName.upper() + '_DATA'
def runContainer(containerName, rootPassword, hasVolume=False):
''' Creates the container
'''
if hasVolume:
containerVolumeName = getDataVolumeName(containerName)
call('docker run --volumes-from ' + containerVolumeName + ' --name ' + containerName + ' -e MYSQL_ROOT_PASSWORD="' + rootPassword + '" -d mysql', shell=True)
else:
call('docker run --name ' + containerName + ' -e MYSQL_ROOT_PASSWORD="' + rootPassword + '" -d mysql', shell=True)
return
def main():
parser = argparse.ArgumentParser(
description="Creates a new MySQL container using the mysql image",
prog="dmysql-server")
parser.add_argument("containerName", help="The name of the mysql container to create")
parser.add_argument("rootPassword", help="The root password to define when creating the container")
# --with-volume and --volumes-from should be mutually exclusive?
parser.add_argument("--with-volume", help="Creates a data-only container", action='store_true')
parser.add_argument("--volumes-from", help="Use a previously created data-only container", action='store_true')
args = parser.parse_args()
# If we need to create a volume
if args.with_volume:
# Create the container name variable
# ?perhaps have an option to get this from a command line argument?
containerVolumeName = getDataVolumeName(args.containerName)
# Create data container
createVolume(containerVolumeName)
# If there's a volume
if (args.with_volume or args.volumes_from):
runContainer(containerName=args.containerName, rootPassword=args.rootPassword, hasVolume=True)
else:
runContainer(containerName=args.containerName, rootPassword=args.rootPassword)
return
It would be even more flexible if we could also specify the name of the data volume container?