├── README.md
└── image_provisioner.yml


/README.md:
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 1 | # image-provisioner
 2 | 
 3 | A simple Ansible playbook to quickly provision VMs in a KVM/QEMU environment.
 4 | 
 5 | ## Assumptions
 6 | 
 7 | You have Ansible installed on your KVM host
 8 | 
 9 | ## Usage
10 | 
11 | 1. Create a `cloud-init` `user-data` and `meta-data` file. Read about `cloud-init` [here](https://cloudinit.readthedocs.io/en/latest/)
12 | 
13 | 2. Create the following directories or change them in the playbook to suit your environment.
14 | - `/data/vm_storage/cloud-init`
15 | - `/data/vm_storage/cloud-init/isos`
16 | - `/data/vm_storage/images/base`
17 | 
18 | At a minimum you should have storage for your cloud images, a directory for your `cloud-init` files and a directory
19 | for your installed VMs.
20 | 
21 | 3. Download a qcow2 cloud image for the operating system of your choice.
22 | 
23 | 4. Move the cloud image to `/data/vm_storage/images/base`
24 | 
25 | 5. Change the `base_disk` disk variable to match the image you downloaded.
26 | 
27 | 6. Ensure the `disk_path` variable matches the directory for your installed VMs.
28 | 
29 | 7. Run the playbook as follows:
30 | `ansible-playbook image_provisioner.yml --extra-vars="host_name=HOSTNAME full_host_name=FQDN memory=MEMORY vcpus=VCPUS network=NETWORK disk_size=DISK_SIZE"`
31 | 
32 | 8. If everything works, this will rysnc and resize the disk image, mount your cloud-init data, install it with `virt-install` and delete the old cloud-init data. 
33 | 


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/image_provisioner.yml:
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 1 | ---
 2 | # First attempt
 3 | - hosts: localhost
 4 |   vars: 
 5 |     host_name: '{{ host_name }}'
 6 |     full_host_name: '{{ full_host_name }}'
 7 |     memory: '{{ memory }}'
 8 |     vpcus: '{{ vcpus }}'
 9 |     disk_size: '{{ disk_size }}'
10 |     network: '{{ network }}'
11 |     ansible_hosts: '/etc/ansible/hosts'
12 |     cloud_init_path: '/data/vm_storage/cloud-init'
13 |     cloud_init_isos: '/data/vm_storage/cloud-init/isos'
14 |     base_disk: '/data/vm_storage/images/base/CentOS-7-x86_64-GenericCloud-1804.qcow2'
15 |     disk_path: '/data/vm_storage/images'
16 | 
17 |   tasks:
18 |     - name: Instantiate image
19 |       command: rsync -a {{ base_disk }} {{ disk_path }}/{{ host_name }}.qcow2
20 |       become: yes
21 |    
22 |     - name: Generate new meta-data instance-id
23 |       shell: 'echo instance-id: {{ host_name }} >> {{ cloud_init_path }}/meta-data'
24 |       become: yes
25 | 
26 |     - name: Generate new meta-data local-hostname
27 |       shell: 'echo local-hostname: {{ full_host_name }} >> {{ cloud_init_path }}/meta-data'
28 |       become: yes
29 |  
30 |     - name: Generate cloud-init ISO
31 |       command: genisoimage -output {{ cloud_init_isos }}/{{ host_name }}.iso -joliet -volid cidata \
32 |                -r {{ cloud_init_path }}/user-data {{ cloud_init_path }}/meta-data
33 |       become: yes
34 |     
35 |     - name: Resize disk image
36 |       command: qemu-img resize {{ disk_path }}/{{ host_name }}.qcow2 {{ disk_size }}
37 | 
38 |     
39 |     - name: Import the VM
40 |       command: virt-install \
41 |                --name {{ host_name }} \
42 |                --vcpus {{ vcpus }} \
43 |                --memory {{ memory }} \
44 |                --import \
45 |                --disk '{{ disk_path }}/{{ host_name }}'.qcow2,format=qcow2,bus=virtio \
46 |                --disk {{ cloud_init_isos }}/{{ host_name }}.iso,device=cdrom
47 |                --network network={{ network }}
48 |                --os-type=linux
49 |                --os-variant=rhel7
50 |                --noautoconsole
51 |       become: yes
52 |       
53 |     - name: Eject the cloud-init ISO
54 |       command: virsh change-media {{ host_name }} hda --eject --config
55 |       become: yes
56 |  
57 |     - name: Delete the cloud-init ISO
58 |       command: rm '{{ cloud_init_isos }}/{{ host_name }}'.iso
59 |       become: yes 
60 | 
61 |     - name: Remove old meta-data file
62 |       command: rm '{{ cloud_init_path }}/meta-data'
63 |       become: yes
64 |           
65 |     - name: Add {{ host_name }} to ansible/hosts
66 |       lineinfile:
67 |         path: '{{ ansible_hosts }}'
68 |         line: '{{ host_name }}'
69 |         state: present
70 |       become: yes
71 |          
72 |     - name: Remove {{ host_name }} entry in .ssh/known_hosts
73 |       lineinfile:
74 |         path: ~/.ssh/known_hosts
75 |         line: '{{ host_name }}'
76 |         state: absent
77 |  
78 |     - name: Reboot {{ host_name }}
79 |       command: virsh reboot {{ host_name }}
80 |       become: yes
81 | 


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