vmware_ubuntu_cloud_image

Ansible role for creating virtual machines based on Ubuntu Cloud Images in a vSphere environment.

Ubuntu Cloud Images

Ubuntu offers pre-installed images for usage in clouds. One of the available image formats is Open Virtualization Appliance (OVA) that can be imported into VMware. The images use the cloud-init mechanism to allow very basic configuration. Sadly, there is no support for using static IP addresses and for adjusting the hardware during machine creation.

This role adds support for these features.

Features

• Creates a virtual machine (VM) from a previously downloaded OVA file.
• Sets the hostname.
• Adds one or more ssh public keys and/or a password for the default user "ubuntu" so that Ansible can connect to the new machine.
• Optionally adjusts the hardware, e.g. number of CPUs or memory, see vmware_guest for possible customizations.
• Optionally sets VM notes (annotations), VM configuration file parameters and/or VM custom attributes.
• Disk size may be increased (defaults to 10GB), additional disks may be created and added.
• Optionally changes the dynamic IP address to a static one (taken either from the playbook or from DNS).
• The VM is turned on and can be used in the same playbook that invoked this role.
• Several VMs can be created in parallel.
• Tested with Ubuntu Cloud Images 21.04, 20.10, 20.04, 19.10, 19.04, 18.10, 18.04 and 17.10. Older versions do not work because they do not use netplan for network configuration.

Requirements

To use this role, you need

• a vSphere environment where the VM will be deployed.
• Credentials for the vCenter server of that environment with appropriate permissions, see below.
• an OVA file, e.g. ubuntu-18.04-server-cloudimg-amd64.ova on the control machine.

If you want to retrieve the VM's IP addresses from DNS, you also have to

• install dnspython (python library, http://www.dnspython.org/) on the control machine.
• use fully qualified domain names (FQDN, e.g. host.example.org) in the inventory. The FQDN will also be used as the VM name.
• add A records for each VM you want to create.

The minimum Ansible version is 2.10.7. The minimum community.vmware collection version is 1.8.0, which is part of the Ansible community package 3.2.0.

vSphere Permissions

The minimum permissions to create a VM with this role are:

DataStore > Allocate Space
Network > Assign Network
Resource > Assign Virtual Machine to Resource Pool
vApp > Import
Virtual Machine > Interaction > Power On
Virtual Machine > Configuration > Add New Disk

To adjust CPU and memory settings, you need

Virtual Machine > Configuration > Change CPU count
Virtual Machine > Configuration > Memory

To adjust disk size, you need

Virtual Machine > Configuration > Extend virtual disk

Advanced configuration options might need additional privileges.

Role Variables

vCenter Connection

• The URL of the vCenter server is set with vcenter_hostname or the environment variable VMWARE_HOST.
• The vCenter user is set with vcenter_username or the environment variable VMWARE_USER.
• The vCenter password is set with vcenter_password or the environment variable VMWARE_PASSWORD.
• Certificate validation can be disabled by setting vcenter_validate_certs=no or setting the environment variable VMWARE_VALIDATE_CERTS to no.

VMware Settings

• The OVA file on the control machine is specified with ova_file.
• The VM is created in the datacenter vmware_datacenter on the datastore vmware_datastore.
• The VM can be placed in a folder by specifying vmware_folder and in a resource pool by specifying vmware_resource_pool.
• The VM name is inventory_hostname by default. It can be changed with vm_guestname.

VM Settings

• The machine's hostname is inventory_hostname_short by default. It can be changed with vm_hostname.
• Use ssh_keys to set a list of public keys that will be added to the authorized_keys file of the user "ubuntu". At least one of ssh_keys and password has to be specified so that Ansible can connect to the new machine.
• Use password to set a password for the user "ubuntu". At least one of ssh_keys and password has to be specified so that Ansible can connect to the new machine.
• The hardware can be specified with hardware, containing a dictionary as specified in vmware_guest.
• Disk size may be adjusted with disk. This parameter accepts a list of disk specifications as documented in vmware_guest_disk. The first disk corresponds to the imported virtual disk. Its size may only be increased. See the example playbook below for usage.
• User defined network mappings can be specified with networks, see vmware_deploy_ovf for semantics.
• VM notes can be set with annotation.
  To use this feature, the VMware permission Virtual Machine > Configuration > Set annotation is required.
• To set VM configuration file parameters, supply advanced_settings with a list of dicts as shown in the example playbook.
• To set VM custom attributes, supply customvalues with a list of dicts as show in the example playbook. Note that new custom values will not be created, they should exist in vCenter prior to deploying.

To use a static IP address, use the following keys in the dictionary static_ip:

• ipv4 - a specific IPv4 address you want to assign. Defaults to the IPv4 address found in DNS for the FQDN.
• netmask - the netmask in CIDR notation, defaults to 8.
• gateway - the default gateway (required)
• dns_servers - a list of the DNS servers' IP addresses, defaults to Google's public DNS servers.
• dns_search - a list of domain names that should be used as DNS search suffixes. Use this to put your VM in a domain.

Inventory Settings

As the VMs do not exist yet, the ssh server's key is unknown. In order to connect to the new VMs, you need to turn off ssh host key checking. If you plan to frequently recreate VMs with the same FQDNs, ssh should not store the fingerprints in the known_hosts file.

Therefore, the recommended host/group variables are:

ansible_user=ubuntu
ansible_ssh_extra_args=-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null

Dependencies

This role does not depend on other roles.

Example Playbook

playbook:

- name: Deploy a Ubuntu Cloud Image Virtual Appliance
  hosts: cloudimg
  gather_facts: no

  roles:
    - role: hamburger_software.vmware_ubuntu_cloud_image
      vars:
        vcenter_hostname: vcenter.your.domain
        vcenter_username: [email protected]
        vcenter_password: verysecret
        vcenter_validate_certs: no
        vmware_datacenter: your-datacenter
        vmware_datastore: your-datastore
        vmware_folder: your-datacenter/vm/some-folder
        ova_file: ubuntu-20.04-server-cloudimg-amd64.ova
        hardware:
          num_cpus: 4
          memory_mb: 2048
        annotation: 'sample VM based on Ubuntu Cloud Image'
        # this avoids excessive syslog messages from multipathd under Ubuntu 20.04
        advanced_settings:
          - key: disk.EnableUUID
            value: 'TRUE'
        customvalues:
          - key: 'yourkey'
            value: 'yourvalue'
        disk:
          - size_gb: 20
            datastore: your-datastore
            scsi_controller: 0
            unit_number: 0
          - size_mb: 250
            datastore: your-datastore
            scsi_controller: 0
            unit_number: 1
            type: thin
        static_ip:
          netmask: 16
          gateway: 10.0.42.1
          dns_servers: [10.0.47.11, 10.0.48.12]
          dns_search:
          - your.domain
        ssh_keys:
          - ssh-rsa AAAAB3Nz[...]== some-key-name
        password: passw0rd

inventory with 5 hosts:

[cloudimg]
vm-[1:5].your.domain

[cloudimg:vars]
ansible_user=ubuntu
ansible_password=passw0rd
ansible_ssh_extra_args=-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null

License

MIT

Author Information

This role was created by Harald Albers at HS - Hamburger Software GmbH & Co. KG.