Complete OVA provisioning script
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@ -1,6 +1,6 @@
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#!/usr/bin/env python3
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# 3-ova.py - PVC Provisioner example script for OVA install
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# 1-ova.py - PVC Provisioner example script for OVA profile install
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2022 Joshua M. Boniface <joshua@boniface.me>
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@ -20,22 +20,25 @@
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###############################################################################
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# This script provides an example of a PVC provisioner script. It will create a
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# custom VM config based on an OVA profile.
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# standard VM config suitable for the OVA profile, and prepare the disks, but do
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# no additional install tasks (noop).
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# This script can thus be used as an example or reference implementation of a
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# PVC provisioner script and expanded upon as required; this specific script is
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# also hard-coded into a normal PVC provisioner system.
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# PVC provisioner script and expanded upon as required.
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# *** READ THIS SCRIPT THOROUGHLY BEFORE USING TO UNDERSTAND HOW IT WORKS. ***
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# The script must implement the class "VMBuilderScript" which extens "VMBuilder",
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# A script must implement the class "VMBuilderScript" which extends "VMBuilder",
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# providing the 5 functions indicated. Detailed explanation of the role of each
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# function is provided.
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# function is provided in context of the example; see the other examples for
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# more potential uses.
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# Within the VMBuilderScript class, several common variables are exposed:
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# Within the VMBuilderScript class, several common variables are exposed through
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# the parent VMBuilder class:
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# self.vm_name: The name of the VM from PVC's perspective
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# self.vm_id: The VM ID (numerical component of the vm_name) from PVC's perspective
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# self.vm_uuid: An automatically-generated UUID for the VM
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# self.vm_profile: The PVC provisioner profile name used for the VM
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# self.vm-data: A dictionary of VM data collected by the provisioner; an example:
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# self.vm_data: A dictionary of VM data collected by the provisioner; as an example:
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# {
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# "ceph_monitor_list": [
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# "hv1.pvcstorage.tld",
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@ -115,41 +118,61 @@
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# }
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# ]
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# }
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#
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# Any other information you may require must be obtained manually.
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# WARNING:
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#
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# For safety reasons, the script runs in a modified chroot. It will have full access to
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# the entire / (root partition) of the hypervisor, but read-only. In addition it has
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# access to /dev, /sys, /run, and a fresh /tmp to write to; use /tmp/target (as
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# convention) as the destination for any mounting of volumes and installation.
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# Of course, in addition to this safety, it is VERY IMPORTANT to be aware that this
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# script runs AS ROOT ON THE HYPERVISOR SYSTEM. You should never allow arbitrary,
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# untrusted users the ability to add provisioning scripts even with this safeguard,
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# since they could still do destructive things to /dev and the like!
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# Run any imports first
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import datetime
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import random
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import pvcapid.libvirt_schema as libvirt_schema
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# This import is always required here, as VMBuilder is used by the VMBuilderScript class
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# and ProvisioningError is the primary exception that should be raised within the class.
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from pvcapid.vmbuilder import VMBuilder, ProvisioningError
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# The VMBuilderScript class must be named as such, and extend VMBuilder.
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class VMBuilderScript(VMBuilder):
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def setup(self):
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"""
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setup(): Perform special setup steps or validation before proceeding
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Validate that we're actually an OVA profile.
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"""
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# Ensure we have debootstrap intalled on the provisioner system
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retcode, stdout, stderr = pvc_common.run_os_command(f"which debootstrap")
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if retcode:
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raise ProvisioningError("Failed to find critical dependency: debootstrap")
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if self.vm_data.get("ova_details") is None:
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raise ProvisioningError(
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"Attempting to provision non-OVA profile with OVA script."
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)
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def create(self):
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"""
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create(): Create the VM libvirt schema definition
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This step *must* return a fully-formed Libvirt XML document as a string.
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This step *must* return a fully-formed Libvirt XML document as a string or the
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provisioning task will fail.
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This example leverages the built-in libvirt_schema objects provided by PVC; these
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can be used as-is, or replaced with your own schema(s) on a per-script basis.
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"""
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# Run any imports first
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import pvcapid.libvirt_schema as libvirt_schema
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import datetime
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import random
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# Create the empty schema document that we will append to and return at the end
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schema = ""
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# Prepare a description based on the VM profile
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description = (
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f"PVC provisioner @ {datetime.datetime.now()}, profile '{self.vm_profile}'"
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)
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description = f"PVC provisioner @ {datetime.datetime.now()}, profile '{self.vm_profile}', OVA '{self.vm_data['ova_details']['name']}'"
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# Format the header
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schema += libvirt_schema.libvirt_header.format(
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@ -186,7 +209,7 @@ class VMBuilderScript(VMBuilder):
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# Add the network devices
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network_id = 0
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for network in self.vm_data["networks"]:
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vm_id_hex = "{:x}".format(int(vm_id % 16))
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vm_id_hex = "{:x}".format(int(self.vm_id % 16))
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net_id_hex = "{:x}".format(int(network_id % 16))
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if self.vm_data.get("mac_template") is not None:
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@ -211,7 +234,7 @@ class VMBuilderScript(VMBuilder):
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schema += libvirt_schema.devices_net_interface.format(
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eth_macaddr=eth_macaddr,
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eth_bridge=eth_bridge,
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eth_bridge=network["eth_bridge"],
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)
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network_id += 1
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@ -250,28 +273,16 @@ class VMBuilderScript(VMBuilder):
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def prepare(self):
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"""
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prepare(): Prepare any disks/volumes for the install() step
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This function should use the various exposed PVC commands as indicated to create
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block devices and map them to the host.
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"""
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# First loop: Create the disks, either by cloning (pvc_ceph.clone_volume), or by
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# new creation (pvc_ceph.add_volume).
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# Run any imports first
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from pvcapid.vmbuilder import open_zk
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from pvcapid.Daemon import config
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import daemon_lib.common as pvc_common
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import daemon_lib.ceph as pvc_ceph
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# First loop: Create the destination disks
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for volume in self.vm_data["volumes"]:
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if volume.get("source_volume") is not None:
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with open_zk(config) as zkhandler:
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success, message = pvc_ceph.clone_volume(
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zkhandler,
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volume["pool"],
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volume["source_volume"],
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f"{self.vm_name}_{volume['disk_id']}",
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)
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print(message)
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if not success:
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raise ProvisioningError(
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f"Failed to clone volume '{volume['source_volume']}' to '{volume['disk_id']}'."
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)
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else:
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with open_zk(config) as zkhandler:
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success, message = pvc_ceph.add_volume(
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zkhandler,
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@ -285,7 +296,7 @@ class VMBuilderScript(VMBuilder):
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f"Failed to create volume '{volume['disk_id']}'."
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)
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# Second loop: Map the disks to the local system
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# Second loop: Map the destination disks
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for volume in self.vm_data["volumes"]:
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dst_volume_name = f"{self.vm_name}_{volume['disk_id']}"
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dst_volume = f"{volume['pool']}/{dst_volume_name}"
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@ -297,301 +308,80 @@ class VMBuilderScript(VMBuilder):
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dst_volume_name,
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)
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print(message)
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if not retcode:
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if not success:
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raise ProvisioningError(f"Failed to map volume '{dst_volume}'.")
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# Third loop: Create filesystems on the volumes
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# Third loop: Map the source disks
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for volume in self.vm_data["volumes"]:
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src_volume_name = volume["volume_name"]
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src_volume = f"{volume['pool']}/{src_volume_name}"
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with open_zk(config) as zkhandler:
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success, message = pvc_ceph.map_volume(
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zkhandler,
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volume["pool"],
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src_volume_name,
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)
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print(message)
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if not success:
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raise ProvisioningError(f"Failed to map volume '{src_volume}'.")
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# Fourth loop: Convert the source (usually VMDK) volume to the raw destination volume
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for volume in self.vm_data["volumes"]:
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src_volume_name = volume["volume_name"]
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src_volume = f"{volume['pool']}/{src_volume_name}"
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src_devpath = f"/dev/rbd/{src_volume}"
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dst_volume_name = f"{self.vm_name}_{volume['disk_id']}"
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dst_volume = f"{volume['pool']}/{dst_volume_name}"
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dst_devpath = f"/dev/rbd/{dst_volume}"
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if volume.get("source_volume") is not None:
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continue
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if volume.get("filesystem") is None:
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continue
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filesystem_args_list = list()
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for arg in volume["filesystem_args"].split():
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arg_entry, *arg_data = arg.split("=")
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arg_data = "=".join(arg_data)
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filesystem_args_list.append(arg_entry)
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filesystem_args_list.append(arg_data)
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filesystem_args = " ".join(filesystem_args_list)
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if volume["filesystem"] == "swap":
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retcode, stdout, stderr = pvc_common.run_os_command(
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f"mkswap -f /dev/rbd/{dst_volume}"
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f"qemu-img convert -C -f {volume['volume_format']} -O raw {src_devpath} {dst_devpath}"
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)
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if retcode:
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raise ProvisioningError(
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f"Failed to create swap on '{dst_volume}': {stderr}"
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)
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else:
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retcode, stdout, stderr = pvc_common.run_os_command(
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f"mkfs.{volume['filesystem']} {filesystem_args} /dev/rbd/{dst_volume}"
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)
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if retcode:
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raise ProvisioningError(
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f"Faield to create {volume['filesystem']} file on '{dst_volume}': {stderr}"
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)
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print(stdout)
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# Create a temporary directory to use during install
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temp_dir = "/tmp/target"
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if not os.exists(temp_dir):
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os.mkdir(temp_dir)
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# Fourth loop: Mount the volumes to a set of temporary directories
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for volume in self.vm_data["volumes"]:
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dst_volume_name = f"{self.vm_name}_{volume['disk_id']}"
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dst_volume = f"{volume['pool']}/{dst_volume_name}"
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if volume.get("source_volume") is not None:
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continue
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if volume.get("filesystem") is None:
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continue
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mapped_dst_volume = f"/dev/rbd/{dst_volume}"
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mount_path = f"{temp_dir}/{volume['mountpoint']}"
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if not os.exists(mount_path):
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os.mkdir(mount_path)
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# Mount filesystem
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retcode, stdout, stderr = pvc_common.run_os_command(
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f"mount {mapped_dst_volume} {mount_path}"
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)
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if retcode:
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raise ProvisioningError(
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f"Failed to mount '{mapped_dst_volume}' on '{mount_path}': {stderr}"
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f"Failed to convert {volume['volume_format']} volume '{src_volume}' to raw volume '{dst_volume}' with qemu-img: {stderr}"
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)
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def install(self):
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"""
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install(): Perform the installation
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Since this is a noop example, this step does nothing, aside from getting some
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arguments for demonstration.
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Noop for OVA deploys as no further tasks are performed.
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"""
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# The directory we mounted things on earlier during prepare()
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temporary_directory = "/tmp/target"
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# Use these convenient aliases for later (avoiding lots of "self.vm_data" everywhere)
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vm_name = self.vm_name
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disks = self.vm_data["disks"]
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networks = self.vm_data["networks"]
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# Parse these arguments out of self.vm_data["script_arguments"]
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if self.vm_data["script_arguments"].get("deb_release") is not None:
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deb_release = self.vm_data["script_arguments"].get("deb_release")
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else:
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deb_release = "stable"
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if self.vm_data["script_arguments"].get("deb_mirror") is not None:
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deb_mirror = self.vm_data["script_arguments"].get("deb_mirror")
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else:
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deb_mirror = "http://ftp.debian.org/debian"
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if self.vm_data["script_arguments"].get("deb_packages") is not None:
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deb_packages = (
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self.vm_data["script_arguments"].get("deb_packages").split(",")
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)
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else:
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deb_packages = [
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"linux-image-amd64",
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"grub-pc",
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"cloud-init",
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"python3-cffi-backend",
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"wget",
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]
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# We need to know our root disk
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root_disk = None
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for disk in disks:
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if disk["mountpoint"] == "/":
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root_disk = disk
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if not root_disk:
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raise ProvisioningError("Failed to find root disk in disks list")
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# Perform a deboostrap installation
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os.system(
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"debootstrap --include={pkgs} {suite} {target} {mirror}".format(
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suite=deb_release,
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target=temporary_directory,
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mirror=deb_mirror,
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pkgs=",".join(deb_packages),
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)
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)
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# Bind mount the devfs
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os.system("mount --bind /dev {}/dev".format(temporary_directory))
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# Create an fstab entry for each disk
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fstab_file = "{}/etc/fstab".format(temporary_directory)
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# The disk ID starts at zero and increments by one for each disk in the fixed-order
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# disk list. This lets us work around the insanity of Libvirt IDs not matching guest IDs,
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# while still letting us have some semblance of control here without enforcing things
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# like labels. It increments in the for loop below at the end of each iteration, and is
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# used to craft a /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-X device ID
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# which will always match the correct order from Libvirt (unlike sdX/vdX names).
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disk_id = 0
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for disk in disks:
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# We assume SSD-based/-like storage, and dislike atimes
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options = "defaults,discard,noatime,nodiratime"
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# The root, var, and log volumes have specific values
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if disk["mountpoint"] == "/":
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root_disk["scsi_id"] = disk_id
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dump = 0
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cpass = 1
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elif disk["mountpoint"] == "/var" or disk["mountpoint"] == "/var/log":
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dump = 0
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cpass = 2
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else:
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dump = 0
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cpass = 0
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# Append the fstab line
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with open(fstab_file, "a") as fh:
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data = "/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-{disk} {mountpoint} {filesystem} {options} {dump} {cpass}\n".format(
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disk=disk_id,
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mountpoint=disk["mountpoint"],
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filesystem=disk["filesystem"],
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options=options,
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dump=dump,
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cpass=cpass,
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)
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fh.write(data)
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# Increment the disk_id
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disk_id += 1
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# Write the hostname
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hostname_file = "{}/etc/hostname".format(temporary_directory)
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with open(hostname_file, "w") as fh:
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fh.write("{}".format(vm_name))
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# Fix the cloud-init.target since it's broken
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cloudinit_target_file = "{}/etc/systemd/system/cloud-init.target".format(
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temporary_directory
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)
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with open(cloudinit_target_file, "w") as fh:
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data = """[Install]
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WantedBy=multi-user.target
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[Unit]
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Description=Cloud-init target
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After=multi-user.target
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"""
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fh.write(data)
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# NOTE: Due to device ordering within the Libvirt XML configuration, the first Ethernet interface
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# will always be on PCI bus ID 2, hence the name "ens2".
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# Write a DHCP stanza for ens2
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ens2_network_file = "{}/etc/network/interfaces.d/ens2".format(
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temporary_directory
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)
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with open(ens2_network_file, "w") as fh:
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data = """auto ens2
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iface ens2 inet dhcp
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"""
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fh.write(data)
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# Write the DHCP config for ens2
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dhclient_file = "{}/etc/dhcp/dhclient.conf".format(temporary_directory)
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with open(dhclient_file, "w") as fh:
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data = (
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"""# DHCP client configuration
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# Written by the PVC provisioner
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option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
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interface "ens2" {
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"""
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+ """ send fqdn.fqdn = "{hostname}";
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send host-name = "{hostname}";
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""".format(
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hostname=vm_name
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)
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+ """ request subnet-mask, broadcast-address, time-offset, routers,
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domain-name, domain-name-servers, domain-search, host-name,
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dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers,
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netbios-name-servers, netbios-scope, interface-mtu,
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rfc3442-classless-static-routes, ntp-servers;
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}
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"""
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)
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fh.write(data)
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# Write the GRUB configuration
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grubcfg_file = "{}/etc/default/grub".format(temporary_directory)
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with open(grubcfg_file, "w") as fh:
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data = """# Written by the PVC provisioner
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GRUB_DEFAULT=0
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GRUB_TIMEOUT=1
|
||||
GRUB_DISTRIBUTOR="PVC Virtual Machine"
|
||||
GRUB_CMDLINE_LINUX_DEFAULT="root=/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-{root_disk} console=tty0 console=ttyS0,115200n8"
|
||||
GRUB_CMDLINE_LINUX=""
|
||||
GRUB_TERMINAL=console
|
||||
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
|
||||
GRUB_DISABLE_LINUX_UUID=false
|
||||
""".format(
|
||||
root_disk=root_disk["scsi_id"]
|
||||
)
|
||||
fh.write(data)
|
||||
|
||||
# Chroot, do some in-root tasks, then exit the chroot
|
||||
with chroot_target(temporary_directory):
|
||||
# Install and update GRUB
|
||||
os.system(
|
||||
"grub-install --force /dev/rbd/{}/{}_{}".format(
|
||||
root_disk["pool"], vm_name, root_disk["disk_id"]
|
||||
)
|
||||
)
|
||||
os.system("update-grub")
|
||||
# Set a really dumb root password [TEMPORARY]
|
||||
os.system("echo root:test123 | chpasswd")
|
||||
# Enable cloud-init target on (first) boot
|
||||
# NOTE: Your user-data should handle this and disable it once done, or things get messy.
|
||||
# That cloud-init won't run without this hack seems like a bug... but even the official
|
||||
# Debian cloud images are affected, so who knows.
|
||||
os.system("systemctl enable cloud-init.target")
|
||||
|
||||
# Unmount the bound devfs
|
||||
os.system("umount {}/dev".format(temporary_directory))
|
||||
pass
|
||||
|
||||
def cleanup(self):
|
||||
"""
|
||||
cleanup(): Perform any cleanup required due to prepare()/install()
|
||||
|
||||
It is important to now reverse *all* steps taken in those functions that might
|
||||
need cleanup before teardown of the overlay chroot environment.
|
||||
This function is also called if there is ANY exception raised in the prepare()
|
||||
or install() steps. While this doesn't mean you shouldn't or can't raise exceptions
|
||||
here, be warned that doing so might cause loops. Do this only if you really need to.
|
||||
"""
|
||||
|
||||
temp_dir = "/tmp/target"
|
||||
for volume in list(reversed(self.vm_data["volumes"])):
|
||||
src_volume_name = volume["volume_name"]
|
||||
src_volume = f"{volume['pool']}/{src_volume_name}"
|
||||
src_devpath = f"/dev/rbd/{src_volume}"
|
||||
|
||||
with open_zk(config) as zkhandler:
|
||||
success, message = pvc_ceph.unmap_volume(
|
||||
zkhandler,
|
||||
volume["pool"],
|
||||
src_volume_name,
|
||||
)
|
||||
if not success:
|
||||
raise ProvisioningError(
|
||||
f"Failed to unmap source volume '{src_volume_name}': {message}"
|
||||
)
|
||||
|
||||
for volume in list(reversed(self.vm_data["volumes"])):
|
||||
dst_volume_name = f"{self.vm_name}_{volume['disk_id']}"
|
||||
dst_volume = f"{volume['pool']}/{dst_volume_name}"
|
||||
mapped_dst_volume = f"/dev/rbd/{dst_volume}"
|
||||
mount_path = f"{temp_dir}/{volume['mountpoint']}"
|
||||
dst_devpath = f"/dev/rbd/{dst_volume}"
|
||||
|
||||
if (
|
||||
volume.get("source_volume") is None
|
||||
and volume.get("filesystem") is not None
|
||||
):
|
||||
# Unmount filesystem
|
||||
retcode, stdout, stderr = pvc_common.run_os_command(
|
||||
f"umount {mount_path}"
|
||||
)
|
||||
if retcode:
|
||||
raise ProvisioningError(
|
||||
f"Failed to unmount '{mapped_dst_volume}' on '{mount_path}': {stderr}"
|
||||
)
|
||||
|
||||
# Unmap volume
|
||||
with open_zk(config) as zkhandler:
|
||||
success, message = pvc_ceph.unmap_volume(
|
||||
zkhandler,
|
||||
|
|
@ -600,5 +390,5 @@ GRUB_DISABLE_LINUX_UUID=false
|
|||
)
|
||||
if not success:
|
||||
raise ProvisioningError(
|
||||
f"Failed to unmap '{mapped_dst_volume}': {stderr}"
|
||||
f"Failed to unmap destination volume '{dst_volume_name}': {message}"
|
||||
)
|
||||
|
|
|
|||
Loading…
Reference in New Issue