622 lines
23 KiB
Python
622 lines
23 KiB
Python
#!/usr/bin/env python3
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# 2-debootstrap.py - PVC Provisioner example script for debootstrap 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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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 3.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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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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# standard VM config and install a Debian-like OS using debootstrap.
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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.
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# The script must implement the class "VMBuilderScript" which extens "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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# Within the VMBuilderScript class, several common variables are exposed:
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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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# {
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# "ceph_monitor_list": [
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# "hv1.pvcstorage.tld",
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# "hv2.pvcstorage.tld",
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# "hv3.pvcstorage.tld"
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# ],
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# "ceph_monitor_port": "6789",
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# "ceph_monitor_secret": "96721723-8650-4a72-b8f6-a93cd1a20f0c",
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# "mac_template": null,
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# "networks": [
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# {
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# "eth_bridge": "vmbr1001",
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# "id": 72,
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# "network_template": 69,
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# "vni": "1001"
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# },
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# {
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# "eth_bridge": "vmbr101",
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# "id": 73,
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# "network_template": 69,
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# "vni": "101"
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# }
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# ],
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# "script": [contents of this file]
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# "script_arguments": {
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# "deb_mirror": "http://ftp.debian.org/debian",
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# "deb_release": "bullseye"
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# },
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# "system_architecture": "x86_64",
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# "system_details": {
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# "id": 78,
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# "migration_method": "live",
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# "name": "small",
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# "node_autostart": false,
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# "node_limit": null,
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# "node_selector": null,
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# "ova": null,
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# "serial": true,
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# "vcpu_count": 2,
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# "vnc": false,
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# "vnc_bind": null,
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# "vram_mb": 2048
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# },
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# "volumes": [
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# {
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# "disk_id": "sda",
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# "disk_size_gb": 4,
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# "filesystem": "ext4",
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# "filesystem_args": "-L=root",
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# "id": 9,
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# "mountpoint": "/",
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# "pool": "vms",
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# "source_volume": null,
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# "storage_template": 67
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# },
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# {
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# "disk_id": "sdb",
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# "disk_size_gb": 4,
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# "filesystem": "ext4",
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# "filesystem_args": "-L=var",
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# "id": 10,
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# "mountpoint": "/var",
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# "pool": "vms",
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# "source_volume": null,
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# "storage_template": 67
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# },
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# {
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# "disk_id": "sdc",
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# "disk_size_gb": 4,
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# "filesystem": "ext4",
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# "filesystem_args": "-L=log",
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# "id": 11,
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# "mountpoint": "/var/log",
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# "pool": "vms",
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# "source_volume": null,
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# "storage_template": 67
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# }
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# ]
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# }
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from pvcapid.vmbuilder import 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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"""
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# Run any imports first
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import daemon_lib.common as pvc_common
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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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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 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 datetime
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import random
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import pvcapid.libvirt_schema as libvirt_schema
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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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# Format the header
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schema += libvirt_schema.libvirt_header.format(
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vm_name=self.vm_name,
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vm_uuid=self.vm_uuid,
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vm_description=description,
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vm_memory=self.vm_data["system_details"]["vram_mb"],
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vm_vcpus=self.vm_data["system_details"]["vcpu_count"],
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vm_architecture=self.vm_data["system_architecture"],
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)
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# Add the disk devices
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monitor_list = self.vm_data["ceph_monitor_list"]
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monitor_port = self.vm_data["ceph_monitor_port"]
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monitor_secret = self.vm_data["ceph_monitor_secret"]
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for volume in self.vm_data["volumes"]:
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schema += libvirt_schema.devices_disk_header.format(
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ceph_storage_secret=monitor_secret,
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disk_pool=volume["pool"],
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vm_name=self.vm_name,
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disk_id=volume["disk_id"],
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)
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for monitor in monitor_list:
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schema += libvirt_schema.devices_disk_coordinator.format(
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coordinator_name=monitor,
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coordinator_ceph_mon_port=monitor_port,
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)
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schema += libvirt_schema.devices_disk_footer
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# Add the special vhostmd device for hypervisor information inside the VM
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schema += libvirt_schema.devices_vhostmd
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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(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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mac_prefix = "52:54:01"
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macgen_template = self.vm_data["mac_template"]
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eth_macaddr = macgen_template.format(
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prefix=mac_prefix, vmid=vm_id_hex, netid=net_id_hex
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)
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else:
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mac_prefix = "52:54:00"
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random_octet_A = "{:x}".format(random.randint(16, 238))
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random_octet_B = "{:x}".format(random.randint(16, 238))
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random_octet_C = "{:x}".format(random.randint(16, 238))
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macgen_template = "{prefix}:{octetA}:{octetB}:{octetC}"
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eth_macaddr = macgen_template.format(
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prefix=mac_prefix,
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octetA=random_octet_A,
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octetB=random_octet_B,
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octetC=random_octet_C,
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)
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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=network["eth_bridge"],
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)
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network_id += 1
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# Add default devices
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schema += libvirt_schema.devices_default
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# Add serial device
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if self.vm_data["system_details"]["serial"]:
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schema += libvirt_schema.devices_serial.format(vm_name=self.vm_name)
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# Add VNC device
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if self.vm_data["system_details"]["vnc"]:
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if self.vm_data["system_details"]["vnc_bind"]:
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vm_vnc_bind = self.vm_data["system_details"]["vnc_bind"]
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else:
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vm_vnc_bind = "127.0.0.1"
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vm_vncport = 5900
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vm_vnc_autoport = "yes"
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schema += libvirt_schema.devices_vnc.format(
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vm_vncport=vm_vncport,
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vm_vnc_autoport=vm_vnc_autoport,
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vm_vnc_bind=vm_vnc_bind,
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)
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# Add SCSI controller
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schema += libvirt_schema.devices_scsi_controller
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# Add footer
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schema += libvirt_schema.libvirt_footer
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return schema
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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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# 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 disks, either by cloning (pvc_ceph.clone_volume), or by
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# new creation (pvc_ceph.add_volume).
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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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volume["pool"],
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f"{self.vm_name}_{volume['disk_id']}",
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f"{volume['disk_size_gb']}G",
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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 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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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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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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dst_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 '{dst_volume}'.")
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# Third loop: Create filesystems on the volumes
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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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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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)
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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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)
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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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"""
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# Run any imports first
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from pvcapid.vmbuilder import chroot
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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
|
|
[Unit]
|
|
Description=Cloud-init target
|
|
After=multi-user.target
|
|
"""
|
|
fh.write(data)
|
|
|
|
# NOTE: Due to device ordering within the Libvirt XML configuration, the first Ethernet interface
|
|
# will always be on PCI bus ID 2, hence the name "ens2".
|
|
# Write a DHCP stanza for ens2
|
|
ens2_network_file = "{}/etc/network/interfaces.d/ens2".format(
|
|
temporary_directory
|
|
)
|
|
with open(ens2_network_file, "w") as fh:
|
|
data = """auto ens2
|
|
iface ens2 inet dhcp
|
|
"""
|
|
fh.write(data)
|
|
|
|
# Write the DHCP config for ens2
|
|
dhclient_file = "{}/etc/dhcp/dhclient.conf".format(temporary_directory)
|
|
with open(dhclient_file, "w") as fh:
|
|
data = (
|
|
"""# DHCP client configuration
|
|
# Written by the PVC provisioner
|
|
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
|
|
interface "ens2" {
|
|
"""
|
|
+ """ send fqdn.fqdn = "{hostname}";
|
|
send host-name = "{hostname}";
|
|
""".format(
|
|
hostname=vm_name
|
|
)
|
|
+ """ request subnet-mask, broadcast-address, time-offset, routers,
|
|
domain-name, domain-name-servers, domain-search, host-name,
|
|
dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers,
|
|
netbios-name-servers, netbios-scope, interface-mtu,
|
|
rfc3442-classless-static-routes, ntp-servers;
|
|
}
|
|
"""
|
|
)
|
|
fh.write(data)
|
|
|
|
# Write the GRUB configuration
|
|
grubcfg_file = "{}/etc/default/grub".format(temporary_directory)
|
|
with open(grubcfg_file, "w") as fh:
|
|
data = """# Written by the PVC provisioner
|
|
GRUB_DEFAULT=0
|
|
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(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))
|
|
|
|
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.
|
|
"""
|
|
|
|
# Run any imports first
|
|
import daemon_lib.common as pvc_common
|
|
import daemon_lib.ceph as pvc_ceph
|
|
|
|
temp_dir = "/tmp/target"
|
|
|
|
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']}"
|
|
|
|
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,
|
|
volume["pool"],
|
|
dst_volume_name,
|
|
)
|
|
if not success:
|
|
raise ProvisioningError(
|
|
f"Failed to unmap '{mapped_dst_volume}': {stderr}"
|
|
)
|