create, format and mount lvm volume for lxc container

create_container_storage.sh

#!/bin/bash

VGROUP=lxcGuestsShared

name_regex="^[a-zA-Z0-9_]+$"
size_regex="^[0-9]+G$"

usage() {
        echo -e "$1\nUsage: $0 <NAME> <SIZE>\n\t\
where:\tNAME - the nameof the new container (should match '$name_regex')\n\
\t\tSIZE - size for lvmcreate\n\
\texample: $0 myMachine 20G" 1>&2

        exit 1
}

if (( $# != 2 )) || [ "$1" == "-h" ] || [ "$1" == "--help" ]; then
        usage
fi

[[ $1 =~ $name_regex ]] || usage "ERROR: Bad container name; it shoud match '$name_regex'\n"
[[ $2 =~ $size_regex ]] || usage "ERROR: Bad container size; it shoud match '$size_regex'\n"

NAME=$1
SIZE=$2

set +x

CONTAINER_PATH=/var/lib/lxc/$NAME

test ! -e "$CONTAINER_PATH" || usage "ERROR: container already exists; path: $CONTAINER_PATH\n"

echo lvcreate -L "$SIZE" -n "$NAME" "$VGROUP"
echo mkfs.ext4 -L "$NAME" "/dev/$VGROUP/$NAME"
echo mkdir "$CONTAINER_PATH"
echo echo -e "\"/dev/$VGROUP/$NAME\t$CONTAINER_PATH\text4\terrors=remount-ro\t0\t0\"" \>\> /etc/fstab
echo mount "$CONTAINER_PATH"