mlxc.sh

#!/bin/bash

### Binaries
SCREEN=$(which screen)
LXCSTART=$(which lxc-start)
LXCSTOP=$(which lxc-stop)

### Configuration to get lxc directory
LXCCONF="/etc/default/lxc"
ERR=0


### catch some common errors
if [ -z $SCREEN ] || [ -z $LXCSTART ] || [ -z $LXCSTOP ] ; then
    echo "ERROR: Could not find screen or lxc-start"
    exit 1
fi
if [ -r $LXCCONF ]; then
    source $LXCCONF
else
    echo "ERROR: Could not find config $LXCCONF"
    exit 2
fi

### Functions 
# starting function
function vm_start () {
    for vm in $* ; do
        if [ -d $LXC_DIRECTORY/$vm ]; then
            if screen -ls | grep $vm &> /dev/null ; then
                echo "WARN: $vm already running" 
            else
                screen -d -m -S $vm $LXCSTART -n $vm -f $LXC_DIRECTORY/$vm/config
            fi
        else
            echo "ERROR: $vm doesn't look like a valid container on your system"
            ((ERR++))
        fi
    done
}

# stopping function
function vm_stop () {
    for vm in $* ; do
        if [ -d $LXC_DIRECTORY/$vm ]; then
            if screen -ls | grep $vm &> /dev/null ; then
                $LXCSTOP -n $vm
                echo "WARN: $vm killed" 
            fi
        else
            echo "ERROR: $vm doesn't look like a valid container on your system"
            ((ERR++))
        fi
    done
}

# Print infos about all screens on the system and lxc status
function vm_info () {
    echo "Screens:"
    screen -ls

    echo "LXC Status:"
    for vm in $* ; do
        echo -n "$vm: "
        lxc-info -n $vm | head -1 | awk '{print $NF }'
    done
}

# Print network configs and stuff
function vm_netstat () {
    for vm in $* ; do
        echo "Netstat for $vm:"
        grep "address" $LXC_DIRECTORY/$vm/rootfs/etc/network/interfaces 2>/dev/null | awk '{print "IP: "$2}'
        lxc-netstat -n $vm | grep -v "^tcp6" | grep -v "^unix"
        echo
    done
}

function vm_clone () {
    if [ -z "$1" -o -z "$2" ] || [ ! -d "$LXC_DIRECTORY/$1" ]; then
        echo "ERROR: non-correct usage - see help"
        echo "ERROR: $LXC_DIRECTORY/$2 may exist or $LXC_DIRECTORY/$1 doesn't."
        exit 3
    fi

    # Copy configuration
    echo "INFO: Copying container..."
    cp -a $LXC_DIRECTORY/$1 $LXC_DIRECTORY/$2

    echo "INFO: Changing lxc config..."
    sed -i "s/$1/$2/g" $LXC_DIRECTORY/$2/config

    # ATTENTION!
    # This requries a convention of vm$IP-name-of-vm
    echo "INFO: Getting last octet from vmXX..."
    OCTET=$(echo $2 | sed 's#vm\(..\).*#\1#')

    echo "INFO: Making network config with 10.10.0.$OCTET..."
    sed -i "s/address.*/address 10.10.0.$OCTET/" $LXC_DIRECTORY/$2/rootfs/etc/network/interfaces
}

function vm_help () {
cat << EOF 

Usage:

$0 <commands> [container]

Commands: 

# Starting
* start <container> - Start a container
* startall - Start all your containers (be careful with that!) 

# Stopping
* stop <container> - Stop a container
* stopall - Stop all containers

# Cloning
* clone <container> <new container> - Relative to LXC home!

# Information
* info - Show status for containers and screens
* ls - Same as info
* net - Show all netstats for all your containers
* help - Print this message

EOF
}

### Runtime function switch case
case $1 in
    startall ) vm_start $(lxc-ls | sort | uniq);;
    start ) shift ; vm_start $* ;;
    stopall ) vm_stop $(lxc-ls | sort | uniq);;
    stop ) shift ; vm_stop $* ;;
    clone ) vm_clone "$2" "$3";;
    info|ls ) vm_info $(lxc-ls | sort | uniq);;
    net ) vm_netstat $(lxc-ls | sort | uniq);;
    help ) vm_help ;;
    * ) vm_help ;;
esac

exit $ERR