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https://gitlab.com/libvirt/libvirt-python.git
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71c1cdb134
This example allows to use the guest agent event and metadata to track vCPU count set via the guest agent (agent-based onlining/offlining) and keep it persistent accross domain restarts. The daemon listens for the agent lifecycle event, and if it's received it looks into doman's metadata to see whether a desired count was set and issues the guest agent command.
75 lines
2.1 KiB
Python
Executable File
75 lines
2.1 KiB
Python
Executable File
#!/usr/bin/env python
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import libvirt
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import sys
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import getopt
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import os
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customXMLuri = "guest-cpu.python.libvirt.org"
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def usage():
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print("usage: "+os.path.basename(sys.argv[0])+" [-hcl] domain count [uri]")
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print(" uri will default to qemu:///system")
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print(" --help, -h Print(this help message")
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print(" --config, -c Modify persistent domain configuration")
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print(" --live, -l Modify live domain configuration")
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print("")
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print("Sets the vCPU count via the guest agent and sets the metadata element " +
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"used by guest-vcpu-daemon.py example")
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uri = "qemu:///system"
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flags = 0
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live = False;
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config = False;
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try:
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opts, args = getopt.getopt(sys.argv[1:], "hcl", ["help", "config", "live"])
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except getopt.GetoptError as err:
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# print help information and exit:
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print(str(err)) # will print something like "option -a not recognized"
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usage()
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sys.exit(2)
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for o, a in opts:
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if o in ("-h", "--help"):
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usage()
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sys.exit()
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if o in ("-c", "--config"):
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config = True
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flags |= libvirt.VIR_DOMAIN_AFFECT_CONFIG
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if o in ("-l", "--live"):
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live = True
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flags |= libvirt.VIR_DOMAIN_AFFECT_LIVE
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if len(args) < 2:
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usage()
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sys.exit(1)
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elif len(args) >= 3:
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uri = args[2]
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domain = args[0]
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count = int(args[1])
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conn = libvirt.open(uri)
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dom = conn.lookupByName(domain)
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if flags == 0 or config:
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confvcpus = dom.vcpusFlags(libvirt.VIR_DOMAIN_AFFECT_CONFIG)
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if confvcpus < count:
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print("Persistent domain configuration has only " + str(confvcpus) + " vcpus configured")
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sys.exit(1)
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if flags == 0 or live:
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livevcpus = dom.vcpusFlags(libvirt.VIR_DOMAIN_AFFECT_LIVE)
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if livevcpus < count:
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print("Live domain configuration has only " + str(livevcpus) + " vcpus configured")
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sys.exit(1)
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if flags == 0 or live:
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dom.setVcpusFlags(count, libvirt.VIR_DOMAIN_AFFECT_LIVE | libvirt.VIR_DOMAIN_VCPU_GUEST)
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meta = "<ncpus count='" + str(count) + "'/>"
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dom.setMetadata(libvirt.VIR_DOMAIN_METADATA_ELEMENT, meta, "guestvcpudaemon", customXMLuri, flags)
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