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8da0556f63
Using this tool on a hypervisor admins can query KVM Instances running
on that hypervisor if they have the Qemu Guest Agent installed.
All System VMs have this and they can be queried.
For example:
$ cloudstack-guest-tool i-2-25-VM
This will print some information about network and filesystem status.
root@hv-138-a05-23:~# ./cloudstack-guest-tool s-11-VM --command info|jq
{
"network": [
{
"ip-addresses": [
{
"prefix": 8,
"ip-address": "127.0.0.1",
"ip-address-type": "ipv4"
}
],
"name": "lo",
"hardware-address": "00:00:00:00:00:00"
},
{
"ip-addresses": [
{
"prefix": 16,
"ip-address": "169.254.242.169",
"ip-address-type": "ipv4"
}
],
"name": "eth0",
"hardware-address": "0e:00:a9:fe:f2:a9"
},
...
...
"filesystem": [
{
"mountpoint": "/var",
"disk": [
{
"bus": 0,
"bus-type": "virtio",
"target": 0,
"unit": 0,
"pci-controller": {
"slot": 7,
"bus": 0,
"domain": 0,
"function": 0
}
}
],
"type": "ext4",
"name": "vda6"
},
Signed-off-by: Wido den Hollander <wido@widodh.nl>
130 lines
3.8 KiB
Python
Executable File
130 lines
3.8 KiB
Python
Executable File
#!/usr/bin/env python
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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#
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# Talk to a KVM guest through Libvirt and the Qemu Guest Agent
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# to retrieve information from the guest
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#
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# System VMs have the Qemu Guest Agent installed by default
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# and should properly respond to such commands
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#
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# Talk to KVM Instances through the Qemu Guest Agent
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#
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import argparse
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import json
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import sys
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import libvirt
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import libvirt_qemu
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COMMANDS = ["info", "ping", "fstrim"]
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class Libvirt:
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def __init__(self, uri=None, timeout=5):
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self.timeout = timeout
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self.conn = libvirt.open(uri)
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if not self.conn:
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raise Exception('Failed to open connection to the hypervisor')
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def get_domain(self, name):
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return self.conn.lookupByName(name)
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def agent_command(self, dom, cmd, flags=0, raw=False):
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ret = libvirt_qemu.qemuAgentCommand(dom, json.dumps({'execute': cmd}),
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self.timeout, flags)
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if raw:
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return ret
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return json.loads(ret)['return']
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class GuestCommand:
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def __init__(self, domain, timeout):
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self.domain = domain
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self.timeout = timeout
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self.virt = Libvirt(timeout=self.timeout)
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self.dom = self.virt.get_domain(self.domain)
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def ping(self):
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result = self.virt.agent_command(self.dom, 'guest-ping')
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res = False
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code = 1
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if len(result) == 0:
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res = True
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code = 0
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return {'result': res}, code
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def info(self):
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info = dict()
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info['filesystem'] = 'guest-get-fsinfo'
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info['network'] = 'guest-network-get-interfaces'
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result = dict()
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for key, cmd in info.items():
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result[key] = self.virt.agent_command(self.dom, cmd)
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return result, 0
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def fstrim(self):
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result = self.virt.agent_command(self.dom, 'guest-fstrim')
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res = False
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code = 1
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if len(result) > 0:
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res = True
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code = 0
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return {'result': result}, code
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def main(args):
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command = args.command
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try:
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guestcmd = GuestCommand(args.instance, args.timeout)
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result = {'error': 'Command not implemented'}
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code = 255
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if command == 'info':
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result, code = guestcmd.info()
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elif command == 'ping':
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result, code = guestcmd.ping()
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elif command == 'fstrim':
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result, code = guestcmd.fstrim()
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print(json.dumps(result))
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sys.exit(code)
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except libvirt.libvirtError as exc:
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print(json.dumps({'error': str(exc)}))
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sys.exit(255)
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if __name__ == '__main__':
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parser = argparse.ArgumentParser(description='CloudStack Guest Tool')
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parser.add_argument('instance', type=str,
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help='Instance Name')
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parser.add_argument('--command', type=str, required=False,
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help='Command to execute', default='info',
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choices=COMMANDS)
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parser.add_argument('--timeout', type=int, required=False,
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help='timeout in seconds', default=5)
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args = parser.parse_args()
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main(args)
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