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createLxc.sh

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+#!/bin/bash
+#A script to create LXC virtual machines 
+
+#Takes two mandatory arguments
+#Hostname
+#IP address
+
+#Takes two optional arguments
+#Template to provision from
+#Path to create instance
+
+
+#Usage message
+usage()
+{
+echo "$0 needs to be invoked with two arguments:\
+
+	Argument 1:Hostname
+	Argument 2:IP Address
+
+It can also take two optional arguments:
+
+Path to a template you wish to provision from
+Path to a directory to store a virtual machine in"
+exit 0
+}
+
+#Error handling code
+error_out() 
+{
+echo "A critical error has occured. Please see above line for portion that failed."
+exit 1
+}
+
+bail_out()
+{
+echo "Exiting at user request."
+exit 0
+}
+
+preflight()
+{
+#Ensure script is running as lxcmgmt user
+if [ "$(whoami)" != 'lxcmgmt' ]; then
+        echo "You must be the lxcmgmt user to run $0"
+        exit 1;
+fi
+
+
+#Check for hostname argument
+echo "Ensuring hostname is properly set..."
+if [ -z "$1" ]; then
+error_out
+else
+VMHOSTNAME="$1"
+fi
+
+#Check for IP
+echo "Ensuring ip is properly set..."
+if [ -z "$2" ]; then
+error_out
+else
+VMIP=$2
+fi
+
+#Check for template specification, otherwise set to default
+if [ -n "$3"  ]; then
+VMTEMPLATE="$3"
+else 
+VMTEMPLATE="/lxc/templates/ariesvm.tar.gz"
+fi
+
+#Check for path specification, otherwise set to default
+if [ -n "$4" ]; then
+VMPATH="$4"
+else 
+VMPATH="/lxc/instances/$VMHOSTNAME"
+fi
+
+echo "VM will be created with the following paramaters."
+echo "Hostname: $VMHOSTNAME"
+echo "IPv4 Address: $VMIP"
+echo "Template: $VMTEMPLATE"
+echo "Path: $VMPATH"
+echo "Do you wish to proceed? (Y/N)"
+read proceed
+
+if [ $proceed = "Y" ]; then
+createvm VMHOSTNAME VMIP VMTEMPLATE VMPATH
+elif [ $proceed = "N" ]; then
+bail_out
+else
+echo "Please specify Y or N"
+error_out
+fi
+}
+
+createvm()
+{
+#Provision a vm
+#If we are here, preflight check passed, user confirmed paramaters and we are good to go
+
+#SOME variables...
+CONFIGTEMPLATES="/lxc/templates"
+VMMAC=$(echo $VMIP | awk -F . '{print $4}')
+
+#First we create a directory for the instance
+echo "Creating storage location for $VMHOSTNAME..."
+mkdir $VMPATH
+mkdir $VMPATH/rootfs
+
+#Second we uncompress the VM template
+echo "Uncompressing template..."
+tar xfz $VMTEMPLATE -C $VMPATH/rootfs
+
+#Dynamically create fstab and config file in /lxc/instances/vminstance:
+echo "Creating configuration files..."
+
+#Create fstab:
+echo "Creating fstab..."
+cat > $VMPATH/$VMHOSTNAME.fstab <<FSTAB
+proc            /lxc/instances/$VMHOSTNAME/rootfs/proc         proc    nodev,noexec,nosuid 0 0
+sysfs           /lxc/instances/$VMHOSTNAME/rootfs/sys          sysfs defaults  0 0
+/dev            /lxc/instances/$VMHOSTNAME/rootfs/dev              none    bind    0 0
+FSTAB
+
+echo "Creating config file..."
+cat > $VMPATH/$VMHOSTNAME.config <<CONFIG
+lxc.utsname = $VMHOSTNAME
+lxc.mount = $VMPATH/$VMHOSTNAME.fstab
+lxc.rootfs = $VMPATH/rootfs
+lxc.network.hwaddr = $VMMAC
+lxc.network.ipv4 = $VMIP
+lxc.tty = 6
+lxc.network.type = veth
+lxc.network.flags = up
+lxc.network.link = br0
+lxc.network.name = eth0
+CONFIG
+
+#Start VM:
+echo "Starting your virtual machine $VMHOSTNAME..."
+
+#Verify VM is running: 
+echo "Verifying successful boot of $VMHOSTNAME..."
+
+exit 0
+}
+
+if [ "$1" = "--help" ]; then
+usage
+fi
+
+preflight $1 $2 $3 $4
+
+exit 0