119 lines
4.2 KiB
Python
119 lines
4.2 KiB
Python
import json
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import uncloud.secrets as secrets
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from django.core.management.base import BaseCommand
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from django.contrib.auth import get_user_model
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from uncloud_vm.models import VMSnapshotProduct, VMProduct, VMHost
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from datetime import datetime
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class Command(BaseCommand):
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help = 'Select VM Host for VMs'
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def add_arguments(self, parser):
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parser.add_argument('--this-hostname', required=True)
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parser.add_argument('--this-cluster', required=True)
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parser.add_argument('--create-vm-snapshots', action='store_true')
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parser.add_argument('--schedule-vms', action='store_true')
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parser.add_argument('--start-vms', action='store_true')
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def handle(self, *args, **options):
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for cmd in [ 'create_vm_snapshots', 'schedule_vms', 'start_vms' ]:
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if options[cmd]:
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f = getattr(self, cmd)
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f(args, options)
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def schedule_vms(self, *args, **options):
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for pending_vm in VMProduct.objects.filter(status='PENDING'):
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cores_needed = pending_vm.cores
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ram_needed = pending_vm.ram_in_gb
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# Database filtering
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possible_vmhosts = VMHost.objects.filter(physical_cores__gte=cores_needed)
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# Logical filtering
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possible_vmhosts = [ vmhost for vmhost in possible_vmhosts
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if vmhost.available_cores >=cores_needed
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and vmhost.available_ram_in_gb >= ram_needed ]
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if not possible_vmhosts:
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log.error("No suitable Host found - cannot schedule VM {}".format(pending_vm))
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continue
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vmhost = possible_vmhosts[0]
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pending_vm.vmhost = vmhost
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pending_vm.status = 'SCHEDULED'
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pending_vm.save()
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print("Scheduled VM {} on VMHOST {}".format(pending_vm, pending_vm.vmhost))
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print(self)
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def start_vms(self, *args, **options):
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vmhost = VMHost.objects.get(hostname=options['this_hostname'])
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if not vmhost:
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raise Exception("No vmhost {} exists".format(options['vmhostname']))
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# not active? done here
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if not vmhost.status = 'ACTIVE':
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return
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vms_to_start = VMProduct.objects.filter(vmhost=vmhost,
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status='SCHEDULED')
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for vm in vms_to_start:
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""" run qemu:
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check if VM is not already active / qemu running
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prepare / create the Qemu arguments
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"""
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print("Starting VM {}".format(VM))
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def check_vms(self, *args, **options):
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"""
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Check if all VMs that are supposed to run are running
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"""
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def modify_vms(self, *args, **options):
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"""
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Check all VMs that are requested to be modified and restart them
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"""
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def create_vm_snapshots(self, *args, **options):
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this_cluster = VMCluster(option['this_cluster'])
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for snapshot in VMSnapshotProduct.objects.filter(status='PENDING',
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cluster=this_cluster):
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if not snapshot.extra_data:
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snapshot.extra_data = {}
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# TODO: implement locking here
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if 'creating_hostname' in snapshot.extra_data:
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pass
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snapshot.extra_data['creating_hostname'] = options['this_hostname']
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snapshot.extra_data['creating_start'] = str(datetime.now())
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snapshot.save()
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# something on the line of:
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# for disk im vm.disks:
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# rbd snap create pool/image-name@snapshot name
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# snapshot.extra_data['snapshots']
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# register the snapshot names in extra_data (?)
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print(snapshot)
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def check_health(self, *args, **options):
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pending_vms = VMProduct.objects.filter(status='PENDING')
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vmhosts = VMHost.objects.filter(status='active')
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# 1. Check that all active hosts reported back N seconds ago
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# 2. Check that no VM is running on a dead host
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# 3. Migrate VMs if necessary
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# 4. Check that no VMs have been pending for longer than Y seconds
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# If VM snapshots exist without a VM -> notify user (?)
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print("Nothing is good, you should implement me")
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