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Ganeti

Ganeti is a virtualization cluster manager. We currently use it for our machines at Hetzner. It is planned to eventually replace all uses of Proxmox.

How-to

Create a new VM (manually)

In case the VM creation cookbook is not usable, VMs can also be created manually.

  1. Create in Netbox and allocate IPs
  2. Create the VM with: 
    $ sudo gnt-instance add -t plain -B minmem=1G,maxmem=1G,vcpus=1 --net 0:network=infra-gnt-hetzner-hel-a-dmz1,mac=generate --disk 0:size=8g -n gnt-hetzner-hel01.majava.org --os-type noop --hypervisor-parameters kvm:boot_order=network,vnc_bind_address=127.0.0.1,vnc_password_file=/etc/ganeti/vnc-cluster-password --no-start HOSTNAME.srv.majava.org
$ sudo gnt-instance show HOSTNAME.srv.majava.org
  3. Record MAC address in Netbox
  4. Start the VM: 
    $ sudo gnt-instance start HOSTNAME.srv.majava.org
$ sudo gnt-instance console HOSTNAME.srv.majava.org
  5. Partition disks manually
  6. Wait for install to complete, and VM to shut down
  7. Change boot order to disk, and start it from there: 
    $ sudo gnt-instance modify --hypervisor-parameters=boot_order=disk HOSTNAME.srv.majava.org
$ sudo gnt-instance start HOSTNAME.srv.majava.org
  8. Log in via mgmt, sign puppet certs

Create a new cluster

This command was used to create the gnt-hetzner-hel-a cluster: 

$ gnt-cluster init \
    --no-etc-hosts --no-ssh-init \
    --vg-name vg-gnt \
    --master-netdev lo-gnt --master-netmask 128 --primary-ip-version 6 \
    --secondary-ip 10.20.80.1 \
    --enabled-hypervisors kvm \
    --hypervisor-parameters kvm:kvm_path=/usr/bin/qemu-system-x86_64,kvm_flag=enabled,serial_speed=115200,migration_bandwidth=64,migration_downtime=500,kernel_path= \
    --enabled-disk-templates=plain \
    gnt-hetzner-hel-a.discovery.majava.org