cool updates

2023-07-22 23:59:49 +03:00 · 2023-07-22 23:59:49 +03:00 · 754c608826
commit 754c608826
parent b608d88265
22 changed files with 926 additions and 213 deletions
--- a/.gitignore
+++ b/.gitignore
@ -1,3 +1,4 @@
 __pycache__/
 *.pyc
 *~
+domain.xml
--- a/README.md
+++ b/README.md
@ -2,26 +2,90 @@

 Агент для работы на ворк-нодах.

-Пока взаимодействовать можно только так (через [test.py](test.py)):
+# Как это должно выглядеть

-```
-sudo env NODEAGENT_CONFIG_FILE=$PWD/configuration.toml python test.py
+`node-agent` должен стать обычным DEB-пакетом. Вместе с самим приложением пойдут вспомагательные утилиты:
+
+- **na-vmctl** "Своя" версия virsh, которая дёргает код из Node Agent. Базовые операции с VM и также установка и миграция ВМ. Реализована частично.
+- **na-vmexec**. Обёртка для вызова QEMU guest agent на машинах, больше нчего уметь не должна. Реализована целиком.
+- **na-volctl**. Предполагается здесь оставить всю работу с дисками. Не реализовано.
+
+Этими утилитами Нет цели заменять virsh, нужно реализовать только специфичные для Node Agent вещи.
+
+Зависимости (версии из APT репозитория Debian 12):
+
+- `python3-lxml` 4.9.2
+- `python3-docopt` 0.6.2
+- `python3-libvirt` 9.0.0 (актуальная новее)
+
+# Классы
+
+Весь пакет разбит на модули, а основной функционал на классы.
+
+## `ConfigLoader`
+
+Наследуется от `UserDict`. Принимает в конструктор путь до файла, после чего экземпляром `ConfigLoader` можно пользоваться как обычным словарём. Вызывается внутри `LibvirtSession` при инициализации.
+
+## `LibvirtSession`
+
+Устанавливает сессию с libvirtd и создаёт объект virConnect. Класс умеет принимать в конструктор один аргумент — путь до файла конфигурации, но его можно опустить.
+
+```python
+from node_agent import LibvirtSession
+
+session = LibvirtSession()
+session.close()
 ```

-# Модули
+Также этот класс является контекстным менеджером и его можно использвоать так:

-Основной класс тут `NodeAgent`. Через него осуществляется доступ ко всем методам.
+```python
+from node_agent import LibvirtSession, VirtualMachine

- `base` тут базовый класс.
- `main` тут объявлен `NodeAgent`.
- `exceptions` тут исключения.
- `config` тут понятно.
- `vm` тут объявлен класс `VirtualMachine` с базовыми методами для виртуалок. Генерацию XML для дефайна ВМ следует сделать в отдельном модуле.
+with LibvirtSession() as session:
+    vm = VirtualMachine(session, 'имя_вм')
+    vm.status
+```
+
+## `VirtualMachine`
+
+Класс для базового управления виртуалкой. В конструктор принимает объект LibvirtSession, который в себе содержит объект virConnect и конфиг в виде словаря.
+
+## `QemuAgent`
+
+Класс для работы с агентом на гостях. Его можно считать законченным. Он умеет:
+
+- Выполнять шелл команды через метод `shellexec()`.
+- Выполнять команды через `execute()`.
+
+Внутри также способен:
+
+- Поллить выполнение команды. То есть можно дождаться вывода долгой команды.
+- Декодирует base64 вывод STDERR и STDOUT если надо.
+- Принимать STDIN

 # TODO

-Нужно что-то придумать с обработкой ошибок. Сейчас на неожиданности я вызываю исключения, нужно некритичные из них обработать, чтобы приложение не падало при обращении к несуществующему домену или нефатальных ошибок при работе с существующими доменами.
+- [ ] Установка ВМ
+    - [ ] Конструктор XML
+- [ ] Управление дисками
+- [ ] Удаление ВМ
+- [ ] Изменение CPU
+- [ ] Изменение RAM
+- [ ] Миграция ВМ между нодами
+- [x] Работа с qemu-ga
+- [x] Управление питанием
+- [ ] Вкл/выкл автостарт ВМ
+- [ ] Статистика потребления ресурсов
+- [ ] Получение инфомрации из/о ВМ
+- [ ] SSH-ключи
+- [ ] Сеть
+- [ ] ???

-# Как это должно выглядеть
+# Заметки

-`node-agent` должен быть обычным DEB-пакетом. В пакете само приложение, sysyemd-сервис, конфиг. Бонусом можно доложить консольные утилиты (пока не реализованы): `nodeagent-vmctl` (чтобы напрямую дергать методы виртуалок), `guest-cmd` (обёртка над virsh quest-agent-command).
+xml.py наверное лучше реализовать через lxml.objectify: https://stackoverflow.com/questions/47304314/adding-child-element-to-xml-in-python
+
+???: https://www.geeksforgeeks.org/reading-and-writing-xml-files-in-python/
+
+Минимальный рабочий XML: https://access.redhat.com/documentation/ru-ru/red_hat_enterprise_linux/6/html/virtualization_administration_guide/section-libvirt-dom-xml-example
--- a/config.toml
+++ b/config.toml
@ -0,0 +1,24 @@
+[general]
+
+[libvirt]
+uri = 'qemu:///system'
+
+[logging]
+level = 'INFO'
+file = '/var/log/node-agent.log'
+
+[volumes]
+
+[[volumes.pools]]
+name = 'ssd-nvme'
+enabled = true
+default = true
+path = '/srv/vm-volumes/ssd-nvme'
+
+[[volumes.pools]]
+name = 'hdd'
+enabled = true
+path = '/srv/vm-volumes/hdd'
+
+[vm.images]
+path = '/srv/vm-images'
--- a/configuration.toml
+++ b/configuration.toml
@ -1,10 +0,0 @@
-[general]
-connect_uri = 'qemu:///system'
-
-[blockstorage]
-local = true
-local_path = '/srv/vm-disks'
-
-[imagestorage]
-local = true
-local_path = '/srv/vm-images'
--- a/node_agent/init.py
+++ b/node_agent/init.py
@ -1 +1,4 @@
-from .main import NodeAgent
+from .main import LibvirtSession
+from .vm import VirtualMachine, QemuAgent
+from .config import ConfigLoader
+from .exceptions import *
--- a/node_agent/base.py
+++ b/node_agent/base.py
@ -1,7 +0,0 @@
-import libvirt
-
-
-class NodeAgentBase:
-    def __init__(self, conn: libvirt.virConnect, config: dict):
-        self.config = config
-        self.conn = conn
--- a/node_agent/config.py
+++ b/node_agent/config.py
@ -1,21 +1,29 @@
 import os
 import sys
-import pathlib
 import tomllib
+from pathlib import Path
+from collections import UserDict
+
+from .exceptions import ConfigLoadError


-NODEAGENT_CONFIG_FILE = \
-    os.getenv('NODEAGENT_CONFIG_FILE') or '/etc/nodeagent/configuration.toml'
+NODEAGENT_CONFIG_FILE = os.getenv('NODEAGENT_CONFIG_FILE')
+NODEAGENT_DEFAULT_CONFIG_FILE = '/etc/node-agent/config.toml'


-def load_config(config: pathlib.Path):
-    try:
-        with open(config, 'rb') as conf:
-            return tomllib.load(conf)
-    except (OSError, ValueError) as readerr:
-        sys.exit(f'Error: Cannot read configuration file: {readerr}')
-    except tomllib.TOMLDecodeError as tomlerr:
-        sys.exit(f'Error: Bad TOML syntax in configuration file: {tomlerr}')
+class ConfigLoader(UserDict):
+    def __init__(self, file: Path | None = None):
+        if file is None:
+            file = NODEAGENT_CONFIG_FILE or NODEAGENT_DEFAULT_CONFIG_FILE
+        self.file = Path(file)
+        self.data = self._load()

-
-config = load_config(pathlib.Path(NODEAGENT_CONFIG_FILE))
+    def _load(self):
+        try:
+            with open(self.file, 'rb') as config:
+                return tomllib.load(config)
+                # todo: schema validation
+        except (OSError, ValueError) as readerr:
+            raise ConfigLoadError('Cannot read config file: %s: %s', (self.file, readerr)) from readerr
+        except tomllib.TOMLDecodeError as tomlerr:
+            raise ConfigLoadError('Bad TOML syntax in config file: %s: %s', (self.file, tomlerr)) from tomlerr
--- a/node_agent/exceptions.py
+++ b/node_agent/exceptions.py
@ -1,3 +1,15 @@
+class ConfigLoadError(Exception):
+    """Bad config file syntax, unreachable file or bad data."""
+
+
+class LibvirtSessionError(Exception):
+    """Something went wrong while connecting to libvirt."""
+
+
+class VMError(Exception):
+    """Something went wrong while interacting with the domain."""
+
+
 class VMNotFound(Exception):
    def __init__(self, domain, message='VM not found: {domain}'):
        self.domain = domain
@ -5,30 +17,5 @@ class VMNotFound(Exception):
        super().__init__(self.message)


-class VMStartError(Exception):
-    def __init__(self, domain, message='VM start error: {domain}'):
-        self.domain = domain
-        self.message = message.format(domain=domain)
-        super().__init__(self.message)
-
-
-class VMShutdownError(Exception):
-    def __init__(
-            self,
-            domain,
-            message="VM '{domain}' cannot shutdown, try with hard=True"
-        ):
-        self.domain = domain
-        self.message = message.format(domain=domain)
-        super().__init__(self.message)
-
-
-class VMRebootError(Exception):
-    def __init__(
-            self,
-            domain,
-            message="VM '{domain}' reboot, try with hard=True",
-        ):
-        self.domain = domain
-        self.message = message.format(domain=domain)
-        super().__init__(self.message)
+class QemuAgentError(Exception):
+    """Mostly QEMU Guest Agent is not responding."""
--- a/node_agent/main.py
+++ b/node_agent/main.py
@ -1,8 +1,30 @@
+from pathlib import Path
+from contextlib import AbstractContextManager
+
 import libvirt

-from .vm import VirtualMachine
+from .config import ConfigLoader
+from .exceptions import LibvirtSessionError


-class NodeAgent:
-    def __init__(self, conn: libvirt.virConnect, config: dict):
-        self.vm = VirtualMachine(conn, config)
+class LibvirtSession(AbstractContextManager):
+    def __init__(self, config: Path | None = None):
+        self.config = ConfigLoader(config)
+        self.session = self._connect(self.config['libvirt']['uri'])
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exception_type, exception_value, exception_traceback):
+        self.close()
+
+    def _connect(self, connection_uri: str):
+        try:
+            return libvirt.open(connection_uri)
+        except libvirt.libvirtError as err:
+            raise LibvirtSessionError(
+                'Failed to open connection to the hypervisor: %s' % err
+            )
+
+    def close(self) -> None:
+        self.session.close()
--- a/node_agent/utils/vmctl.py
+++ b/node_agent/utils/vmctl.py
@ -0,0 +1,67 @@
+"""
+Manage virtual machines.
+
+Usage:  na-vmctl [options] status <machine>
+        na-vmctl [options] is-running <machine>
+        na-vmctl [options] start <machine>
+        na-vmctl [options] shutdown <machine> [-f|--force] [-9|--sigkill]
+
+Options:
+    -c, --config <file>  Config file [default: /etc/node-agent/config.yaml]
+    -l, --loglvl <lvl>   Logging level [default: INFO]
+    -f, --force          Force action. On shutdown calls graceful destroy()
+    -9, --sigkill        Send SIGKILL to QEMU process. Not affects without --force
+"""
+
+import sys
+import pathlib
+import logging
+
+from docopt import docopt
+
+sys.path.append('/home/ge/Code/node-agent')
+from node_agent import LibvirtSession, VirtualMachine, VMError, VMNotFound
+
+
+logger = logging.getLogger(__name__)
+levels = logging.getLevelNamesMapping()
+
+
+class Color:
+    RED = '\033[31m'
+    GREEN = '\033[32m'
+    YELLOW = '\033[33m'
+    NONE = '\033[0m'
+
+
+def cli():
+    args = docopt(__doc__)
+    config = pathlib.Path(args['--config']) or None
+    loglvl = args['--loglvl'].upper()
+
+    if loglvl in levels:
+        logging.basicConfig(level=levels[loglvl])
+
+    with LibvirtSession(config) as session:
+        try:
+            vm = VirtualMachine(session, args['<machine>'])
+            if args['status']:
+                print(vm.status)
+            if args['is-running']:
+                if vm.is_running:
+                    print('running')
+                else:
+                    sys.exit(vm.status)
+            if args['start']:
+                vm.start()
+                print(f'{vm.name} started')
+            if args['shutdown']:
+                vm.shutdown(force=args['--force'], sigkill=args['sigkill'])
+        except VMNotFound as nferr:
+            sys.exit(f'{Color.RED}VM {args["<machine>"]} not found.{Color.NONE}')
+        except VMError as vmerr:
+            sys.exit(f'{Color.RED}{vmerr}{Color.NONE}')
+
+
+if __name__ == '__main__':
+    cli()
--- a/node_agent/utils/vmexec.py
+++ b/node_agent/utils/vmexec.py
@ -0,0 +1,92 @@
+"""
+Execute shell commands on guest via guest agent.
+
+Usage:  na-vmexec [options] <machine> <command>
+
+Options:
+    -c, --config <file>  Config file [default: /etc/node-agent/config.yaml]
+    -l, --loglvl <lvl>   Logging level [default: INFO]
+    -s, --shell <shell>  Guest shell [default: /bin/sh]
+    -t, --timeout <sec>  QEMU timeout in seconds to stop polling command status [default: 60]
+"""
+
+import sys
+import pathlib
+import logging
+
+from docopt import docopt
+
+sys.path.append('/home/ge/Code/node-agent')
+from node_agent import LibvirtSession, VMNotFound, QemuAgent, QemuAgentError
+
+
+logger = logging.getLogger(__name__)
+levels = logging.getLevelNamesMapping()
+
+
+class Color:
+    RED = '\033[31m'
+    GREEN = '\033[32m'
+    YELLOW = '\033[33m'
+    NONE = '\033[0m'
+
+
+def cli():
+    args = docopt(__doc__)
+    config = pathlib.Path(args['--config']) or None
+    loglvl = args['--loglvl'].upper()
+
+    if loglvl in levels:
+        logging.basicConfig(level=levels[loglvl])
+
+    with LibvirtSession(config) as session:
+        shell = args['--shell']
+        cmd = args['<command>']
+
+        try:
+            ga = QemuAgent(session, args['<machine>'])
+            exited, exitcode, stdout, stderr = ga.shellexec(
+                cmd,
+                executable=shell,
+                capture_output=True,
+                decode_output=True,
+                timeout=int(args['--timeout']),
+            )
+        except QemuAgentError as qemuerr:
+            errmsg = f'{Color.RED}{err}{Color.NONE}'
+            if str(err).startswith('Polling command pid='):
+                errmsg = (
+                    errmsg + Color.YELLOW
+                    + '\n[NOTE: command may still running]'
+                    + Color.NONE
+                )
+            sys.exit(errmsg)
+        except VMNotFound as err:
+            sys.exit(
+                f'{Color.RED}VM {args["<machine>"]} not found.{Color.NONE}'
+            )
+
+    if not exited:
+        print(
+            Color.YELLOW
+            +'[NOTE: command may still running]'
+            + Color.NONE
+        )
+    else:
+        if exitcode == 0:
+            exitcolor = Color.GREEN
+        else:
+            exitcolor = Color.RED
+        print(
+            exitcolor
+            + f'[command exited with exit code {exitcode}]'
+            + Color.NONE
+        )
+
+    if stderr:
+        print(Color.RED + stderr.strip() + Color.NONE)
+    if stdout:
+        print(Color.GREEN + stdout.strip() + Color.NONE)
+
+if __name__ == '__main__':
+    cli()
--- a/node_agent/utils/volctl.py
+++ b/node_agent/utils/volctl.py
--- a/node_agent/vm.py
+++ b/node_agent/vm.py
@ -1,120 +0,0 @@
-import libvirt
-
-from .base import NodeAgentBase
-from .exceptions import (
-    VMNotFound,
-    VMStartError,
-    VMRebootError,
-    VMShutdownError,
-)
-
-
-class VirtualMachine(NodeAgentBase):
-
-    def _dom(self, domain: str) -> libvirt.virDomain:
-        """Get virDomain object to manipulate with domain."""
-        try:
-            ret = self.conn.lookupByName(domain)
-            if ret is not None:
-                return ret
-            raise VMNotFound(domain)
-        except libvirt.libvirtError as err:
-            raise VMNotFound(err) from err
-
-    def create(
-        self,
-        name: str,
-        volumes: list[dict],
-        vcpus: int,
-        vram: int,
-        image: dict,
-        cdrom: dict | None = None,
-    ):
-        # TODO
-        pass
-
-    def delete(self, name: str, delete_volumes=False):
-        pass
-
-    def status(self, name: str) -> str:
-        """
-        Return VM state: 'running', 'shutoff', etc. Ref:
-        https://libvirt.org/html/libvirt-libvirt-domain.html#virDomainState
-        """
-        state = self._dom(name).info()[0]
-        match state:
-            case libvirt.VIR_DOMAIN_NOSTATE:
-                return 'nostate'
-            case libvirt.VIR_DOMAIN_RUNNING:
-                return 'running'
-            case libvirt.VIR_DOMAIN_BLOCKED:
-                return 'blocked'
-            case libvirt.VIR_DOMAIN_PAUSED:
-                return 'paused'
-            case libvirt.VIR_DOMAIN_SHUTDOWN:
-                return 'shutdown'
-            case libvirt.VIR_DOMAIN_SHUTOFF:
-                return 'shutoff'
-            case libvirt.VIR_DOMAIN_CRASHED:
-                return 'crashed'
-            case libvirt.VIR_DOMAIN_PMSUSPENDED:
-                return 'pmsuspended'
-
-    def is_running(self, name: str) -> bool:
-        """Return True if VM is running, else return False."""
-        if self._dom(name).isActive() != 1:
-            return False  # inactive (0) or error (-1)
-        return True
-
-    def start(self, name: str) -> None:
-        """Start VM."""
-        if not self.is_running(name):
-            ret = self._dom(name).create()
-        else:
-            return
-        if ret != 0:
-            raise VMStartError(name)
-
-    def shutdown(self, name: str, hard=False) -> None:
-        """Shutdown VM. Use hard=True to force shutdown."""
-        if hard:
-            # Destroy VM gracefully (no SIGKILL)
-            ret = self._dom(name).destroyFlags(flags=libvirt.VIR_DOMAIN_DESTROY_GRACEFUL)
-        else:
-            # Normal VM shutdown, OS may ignore this.
-            ret = self._dom(name).shutdown()
-        if ret != 0:
-            raise VMShutdownError(name)
-
-    def reboot(self, name: str, hard=False) -> None:
-        """
-        Reboot VM. Use hard=True to force reboot. With forced reboot
-        VM will shutdown via self.shutdown() (no forced) and started.
-        """
-        if hard:
-            # Forced "reboot"
-            self.shutdown(name)
-            self.start(name)
-        else:
-            # Normal reboot.
-            ret = self._dom(name).reboot()
-        if ret != 0:
-            raise VMRebootError(name)
-
-    def vcpu_set(self, name: str, count: int):
-        pass
-
-    def vram_set(self, name: str, count: int):
-        pass
-
-    def ssh_keys_list(self, name: str, user: str):
-        pass
-
-    def ssh_keys_add(self, name: str, user: str):
-        pass
-
-    def ssh_keys_remove(self, name: str, user: str):
-        pass
-
-    def set_user_password(self, name: str, user: str):
-        pass
--- a/node_agent/vm/init.py
+++ b/node_agent/vm/init.py
@ -0,0 +1,2 @@
+from .main import VirtualMachine
+from .ga import QemuAgent
--- a/node_agent/vm/base.py
+++ b/node_agent/vm/base.py
@ -0,0 +1,22 @@
+import libvirt
+
+from ..main import LibvirtSession
+from ..exceptions import VMNotFound
+
+
+class VMBase:
+    def __init__(self, session: LibvirtSession, name: str):
+        self.domname = name
+        self.session = session.session  # virConnect object
+        self.config = session.config  # ConfigLoader object
+        self.domain = self._get_domain(name)
+
+    def _get_domain(self, name: str) -> libvirt.virDomain:
+        """Get virDomain object by name to manipulate with domain."""
+        try:
+            domain = self.session.lookupByName(name)
+            if domain is not None:
+                return domain
+            raise VMNotFound(name)
+        except libvirt.libvirtError as err:
+            raise VMNotFound(err) from err
--- a/node_agent/vm/ga.py
+++ b/node_agent/vm/ga.py
@ -0,0 +1,192 @@
+import json
+import logging
+from time import time, sleep
+from base64 import standard_b64encode, b64decode, b64encode
+
+import libvirt
+import libvirt_qemu
+
+from ..main import LibvirtSession
+from ..exceptions import QemuAgentError
+from .base import VMBase
+
+
+logger = logging.getLogger(__name__)
+
+
+DEFAULT_WAIT_TIMEOUT = 60  # seconds
+POLL_INTERVAL = 0.3
+
+
+class QemuAgent(VMBase):
+    """
+    Interacting with QEMU guest agent. Methods:
+
+    execute()
+        Low-level method for executing QEMU command as dict. Command dict
+        internally converts to JSON. See method docstring for more info.
+    shellexec()
+        High-level method for executing shell commands on guest. Command
+        must be passed as string. Wraps execute() method.
+    _execute()
+        Just executes QEMU command. Wraps libvirt_qemu.qemuAgentCommand()
+    _get_cmd_result()
+        Intended for long-time commands. This function loops and every
+        POLL_INTERVAL calls 'guest-exec-status' for specified guest PID.
+        Polling ends on command exited or on timeout.
+    _return_tuple()
+        This method transforms JSON command output to tuple and decode
+        base64 encoded strings optionally.
+    """
+
+    def __init__(self,
+        session: LibvirtSession,
+        name: str,
+        timeout: int | None = None,
+        flags: int | None = None
+    ):
+        super().__init__(session, name)
+        self.timeout = timeout or DEFAULT_WAIT_TIMEOUT  # timeout for guest agent
+        self.flags = flags or libvirt_qemu.VIR_DOMAIN_QEMU_MONITOR_COMMAND_DEFAULT
+
+    def execute(
+        self,
+        command: dict,
+        stdin: str | None = None,
+        capture_output: bool = False,
+        decode_output: bool = False,
+        wait: bool = True,
+        timeout: int = DEFAULT_WAIT_TIMEOUT,
+    ):
+        """
+        Execute command on guest and return output if capture_output is True.
+        See https://wiki.qemu.org/Documentation/QMP for QEMU commands reference.
+        Return values:
+            tuple(
+                exited: bool | None,
+                exitcode: int | None,
+                stdout: str | None,
+                stderr: str | None
+            )
+        stdout and stderr are base64 encoded strings or None.
+        """
+        # todo command dict schema validation
+        if capture_output:
+            command['arguments']['capture-output'] = True
+        if isinstance(stdin, str):
+            command['arguments']['input-data'] = standard_b64encode(
+                stdin.encode('utf-8')
+            ).decode('utf-8')
+
+        # Execute command on guest
+        cmd_out = self._execute(command)
+
+        if capture_output:
+            cmd_pid = json.loads(cmd_out)['return']['pid']
+            return self._get_cmd_result(
+                cmd_pid,
+                decode_output=decode_output,
+                wait=wait,
+                timeout=timeout,
+            )
+        return None, None, None, None
+
+    def shellexec(
+        self,
+        command: str,
+        stdin: str | None = None,
+        executable: str = '/bin/sh',
+        capture_output: bool = False,
+        decode_output: bool = False,
+        wait: bool = True,
+        timeout: int = DEFAULT_WAIT_TIMEOUT,
+    ):
+        """
+        Execute command on guest with selected shell. /bin/sh by default.
+        Otherwise of execute() this function brings command as string.
+        """
+        cmd = {
+            'execute': 'guest-exec',
+            'arguments': {
+                'path': executable,
+                'arg': ['-c', command],
+            }
+        }
+        return self.execute(
+            cmd,
+            stdin=stdin,
+            capture_output=capture_output,
+            decode_output=decode_output,
+            wait=wait,
+            timeout=timeout,
+        )
+
+
+    def _execute(self, command: dict):
+        logging.debug('Execute command: vm=%s cmd=%s', self.domname, command)
+        try:
+            return libvirt_qemu.qemuAgentCommand(
+                self.domain,  # virDomain object
+                json.dumps(command),
+                self.timeout,
+                self.flags,
+            )
+        except libvirt.libvirtError as err:
+            raise QemuAgentError(err) from err
+
+    def _get_cmd_result(
+        self,
+        pid: int,
+        decode_output: bool = False,
+        wait: bool = True,
+        timeout: int = DEFAULT_WAIT_TIMEOUT,
+    ):
+        """Get executed command result. See GuestAgent.execute() for info."""
+        exited = exitcode = stdout = stderr = None
+
+        cmd = {
+            'execute': 'guest-exec-status',
+            'arguments': {'pid': pid},
+        }
+
+        if not wait:
+            output = json.loads(self._execute(cmd))
+            return self._return_tuple(output, decode=decode_output)
+
+        logger.debug('Start polling command pid=%s', pid)
+        start_time = time()
+        while True:
+            output = json.loads(self._execute(cmd))
+            if output['return']['exited']:
+                break
+            sleep(POLL_INTERVAL)
+            now = time()
+            if now - start_time > timeout:
+                raise QemuAgentError(
+                    f'Polling command pid={pid} took longer than {timeout} seconds.'
+                )
+        logger.debug(
+            'Polling command pid=%s finished, time taken: %s seconds',
+            pid, int(time()-start_time)
+        )
+        return self._return_tuple(output, decode=decode_output)
+
+    def _return_tuple(self, cmd_output: dict, decode: bool = False):
+        exited = cmd_output['return']['exited']
+        exitcode = cmd_output['return']['exitcode']
+
+        try:
+            stdout = cmd_output['return']['out-data']
+            if decode and stdout:
+                stdout = b64decode(stdout).decode('utf-8')
+        except KeyError:
+            stdout = None
+
+        try:
+            stderr = cmd_output['return']['err-data']
+            if decode and stderr:
+                stderr = b64decode(stderr).decode('utf-8')
+        except KeyError:
+            stderr = None
+
+        return exited, exitcode, stdout, stderr
--- a/node_agent/vm/main.py
+++ b/node_agent/vm/main.py
@ -0,0 +1,126 @@
+import logging
+
+import libvirt
+
+from ..exceptions import VMError
+from .base import VMBase
+
+
+logger = logging.getLogger(__name__)
+
+
+class VirtualMachine(VMBase):
+
+    @property
+    def name(self):
+        return self.domain.name()
+
+    @property
+    def status(self) -> str:
+        """
+        Return VM state: 'running', 'shutoff', etc. Reference:
+        https://libvirt.org/html/libvirt-libvirt-domain.html#virDomainState
+        """
+        state = self.domain.info()[0]
+        match state:
+            case libvirt.VIR_DOMAIN_NOSTATE:
+                return 'nostate'
+            case libvirt.VIR_DOMAIN_RUNNING:
+                return 'running'
+            case libvirt.VIR_DOMAIN_BLOCKED:
+                return 'blocked'
+            case libvirt.VIR_DOMAIN_PAUSED:
+                return 'paused'
+            case libvirt.VIR_DOMAIN_SHUTDOWN:
+                return 'shutdown'
+            case libvirt.VIR_DOMAIN_SHUTOFF:
+                return 'shutoff'
+            case libvirt.VIR_DOMAIN_CRASHED:
+                return 'crashed'
+            case libvirt.VIR_DOMAIN_PMSUSPENDED:
+                return 'pmsuspended'
+
+    @property
+    def is_running(self) -> bool:
+        """Return True if VM is running, else return False."""
+        if self.domain.isActive() != 1:
+            # inactive (0) or error (-1)
+            return False
+        return True
+
+    def start(self) -> None:
+        """Start defined VM."""
+        logger.info('Starting VM: vm=%s', self.domname)
+        if self.is_running:
+            logger.debug('VM vm=%s is already started, nothing to do', self.domname)
+            return
+        try:
+            ret = self.domain.create()
+        except libvirt.libvirtError as err:
+            raise VMError(err) from err
+        if ret != 0:
+            raise VMError('Cannot start VM: vm=%s exit_code=%s', self.domname, ret)
+
+    def shutdown(self, force=False, sigkill=False) -> None:
+        """
+        Send ACPI signal to guest OS to shutdown. OS may ignore this.
+        Use `force=True` for graceful VM destroy. Add `sigkill=True`
+        to hard shutdown (may corrupt guest data!).
+        """
+        if sigkill:
+            flags = libvirt.VIR_DOMAIN_DESTROY_DEFAULT
+        else:
+            flags = libvirt.VIR_DOMAIN_DESTROY_GRACEFUL
+        if force:
+            ret = self.domain.destroyFlags(flags=flags)
+        else:
+            # Normal VM shutdown via ACPI signal, OS may ignore this.
+            ret = self.domain.shutdown()
+        if ret != 0:
+            raise VMError(
+                f'Cannot shutdown VM, try force or sigkill: %s', self.domname
+            )
+
+    def reset(self):
+        """
+        Copypaste from libvirt doc::
+
+            Reset a domain immediately without any guest OS shutdown.
+            Reset emulates the power reset button on a machine, where all
+            hardware sees the RST line set and reinitializes internal state.
+
+            Note that there is a risk of data loss caused by reset without any
+            guest OS shutdown.
+        """
+        ret = self.domian.reset()
+        if ret != 0:
+            raise VMError('Cannot reset VM: %s', self.domname)
+
+    def reboot(self) -> None:
+        """Send ACPI signal to guest OS to reboot. OS may ignore this."""
+        ret = self.domain.reboot()
+        if ret != 0:
+            raise VMError('Cannot reboot: %s', self.domname)
+
+    def set_autostart(self) -> None:
+        ret = self.domain.autostart()
+        if ret != 0:
+            raise VMError('Cannot set : %s', self.domname)
+
+    def vcpu_set(self, count: int):
+        pass
+
+    def vram_set(self, count: int):
+        pass
+
+    def ssh_keys_list(self, user: str):
+        pass
+
+    def ssh_keys_add(self, user: str):
+        pass
+
+    def ssh_keys_remove(self, user: str):
+        pass
+
+    def set_user_password(self, user: str):
+        pass
--- a/node_agent/volume/init.py
+++ b/node_agent/volume/init.py
--- a/node_agent/xml.py
+++ b/node_agent/xml.py
@ -0,0 +1,115 @@
+import pathlib
+
+from lxml import etree
+from lxml.builder import E
+
+
+class NewXML:
+    def __init__(
+        self,
+        name: str,
+        title: str,
+        memory: int,
+        vcpus: int,
+        cpu_vendor: str,
+        cpu_model: str,
+        volume_path: str,
+
+        desc: str | None = None,
+        show_boot_menu: bool = False,
+    ):
+        """
+        Initialise basic XML using lxml E-Factory. Ref:
+
+            - https://lxml.de/tutorial.html#the-e-factory
+            - https://libvirt.org/formatdomain.html
+        """
+        DOMAIN = E.domain
+        NAME = E.name
+        TITLE = E.title
+        DESCRIPTION = E.description
+        METADATA = E.metadata
+        MEMORY = E.memory
+        CURRENTMEMORY = E.currentMemory
+        VCPU = E.vcpu
+        OS = E.os
+        OS_TYPE = E.type
+        OS_BOOT = E.boot
+        FEATURES = E.features
+        ACPI = E.acpi
+        APIC = E.apic
+        CPU = E.cpu
+        CPU_VENDOR = E.vendor
+        CPU_MODEL = E.model
+        ON_POWEROFF = E.on_poweroff
+        ON_REBOOT = E.on_reboot
+        ON_CRASH = E.on_crash
+        DEVICES = E.devices
+        EMULATOR = E.emulator
+        DISK = E.disk
+        DISK_DRIVER = E.driver
+        DISK_SOURCE = E.source
+        DISK_TARGET = E.target
+        INTERFACE = E.interface
+        GRAPHICS = E.graphics
+
+        self.domain = DOMAIN(
+            NAME(name),
+            TITLE(title),
+            DESCRIPTION(desc or ""),
+            METADATA(),
+            MEMORY(str(memory), unit='MB'),
+            CURRENTMEMORY(str(memory), unit='MB'),
+            VCPU(str(vcpus), placement='static'),
+            OS(
+                OS_TYPE('hvm', arch='x86_64'),
+                OS_BOOT(dev='cdrom'),
+                OS_BOOT(dev='hd'),
+            ),
+            FEATURES(
+                ACPI(),
+                APIC(),
+            ),
+            CPU(
+                CPU_VENDOR(cpu_vendor),
+                CPU_MODEL(cpu_model, fallback='forbid'),
+                mode='custom',
+                match='exact',
+                check='partial',
+            ),
+            ON_POWEROFF('destroy'),
+            ON_REBOOT('restart'),
+            ON_CRASH('restart'),
+            DEVICES(
+                EMULATOR('/usr/bin/qemu-system-x86_64'),
+                DISK(
+                    DISK_DRIVER(name='qemu', type='qcow2', cache='writethrough'),
+                    DISK_SOURCE(file=volume_path),
+                    DISK_TARGET(dev='vda', bus='virtio'),
+                    type='file',
+                    device='disk',
+                ),
+            ),
+            type='kvm',
+        )
+
+    def add_volume(self, options: dict, params: dict):
+        """Add disk device to domain."""
+        DISK = E.disk
+        DISK_DRIVER = E.driver
+        DISK_SOURCE = E.source
+        DISK_TARGET = E.target
+
+x = NewXML(
+    name='1',
+    title='first',
+    memory=2048,
+    vcpus=4,
+    cpu_vendor='Intel',
+    cpu_model='Broadwell',
+    volume_path='/srv/vm-volumes/5031077f-f9ea-410b-8d84-ae6e79f8cde0.qcow2',
+)
+
+# x.add_volume()
+# print(x.domain)
+print(etree.tostring(x.domain, pretty_print=True).decode().strip())
--- a/poetry.lock
+++ b/poetry.lock
@ -0,0 +1,136 @@
+# This file is automatically @generated by Poetry 1.4.2 and should not be changed by hand.
+
+[[package]]
+name = "docopt"
+version = "0.6.2"
+description = "Pythonic argument parser, that will make you smile"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
+    {file = "docopt-0.6.2.tar.gz", hash = "sha256:49b3a825280bd66b3aa83585ef59c4a8c82f2c8a522dbe754a8bc8d08c85c491"},
+]
+
+[[package]]
+name = "libvirt-python"
+version = "9.0.0"
+description = "The libvirt virtualization API python binding"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
+    {file = "libvirt-python-9.0.0.tar.gz", hash = "sha256:49702d33fa8cbcae19fa727467a69f7ae2241b3091324085ca1cc752b2b414ce"},
+]
+
+[[package]]
+name = "lxml"
+version = "4.9.3"
+description = "Powerful and Pythonic XML processing library combining libxml2/libxslt with the ElementTree API."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, != 3.4.*"
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+    {file = "lxml-4.9.3.tar.gz", hash = "sha256:48628bd53a426c9eb9bc066a923acaa0878d1e86129fd5359aee99285f4eed9c"},
+]
+
+[package.extras]
+cssselect = ["cssselect (>=0.7)"]
+html5 = ["html5lib"]
+htmlsoup = ["BeautifulSoup4"]
+source = ["Cython (>=0.29.35)"]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.11"
+content-hash = "8e62a9e51f66c5a3a124d0e631ca68803f2c8d933a75faf2783dc4ddf118e7ab"
--- a/pyproject.toml
+++ b/pyproject.toml
@ -4,11 +4,16 @@ version = "0.1.0"
 description = "Node Agent"
 authors = ["ge <ge@nixhacks.net>"]
 readme = "README.md"
-packages = [{include = "node_agent"}]

 [tool.poetry.dependencies]
 python = "^3.11"
-libvirt-python = "^9.4.0"  # 9.0.0 on Debian 12
+libvirt-python = "9.0.0"  # 9.0.0 on Debian 12
+lxml = "^4.9.2"  # 4.9.2 on Debian 12
+docopt = "^0.6.2"  # 0.6.2 on Debian 12
+
+[tool.poetry.scripts]
+na-vmctl = "node_agent.utils.vmctl:cli"
+na-vmexec = "node_agent.utils.vmexec:cli"

 [build-system]
 requires = ["poetry-core"]
--- a/test.py
+++ b/test.py
@ -1,16 +0,0 @@
-import libvirt
-
-from node_agent import NodeAgent
-from node_agent.config import config
-
-
-try:
-    conn = libvirt.open(config['general']['connect_uri'])
-except libvirt.libvirtError as err:
-    sys.exit('Failed to open connection to the hypervisor: %s' % err)
-
-
-node_agent = NodeAgent(conn, config)
-s = node_agent.vm.status('debian12')
-print(s)
-conn.close()