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