About

Usage

• Use your Rackspace Cloud account or get a developer one for free

• Ensure you have novaclient installed. Refer to http://www.rackspace.com/knowledge_center/article/installing-python-novaclient-on-linux-and-mac-os for more details.

• Clone this repo to your local folder

git clone https://github.com/srirajan/cloudinit-demo
cd cloudinit-demo

• Run example 1 on Rackspace Cloud, CentOS 6 (PVHVM). Replace 'key' with your own key name. If you don't have a key

  key=sri-key
  nova boot --flavor=general1-1 \
  --image=518d156d-d4e0-483d-a7db-89cd27b50180 \
  --key-name $key \
  --config-drive=true \
  --user-data=example1.yaml \
  c0001
  

• A look under the hood

  • With the config drive you should see a small 67MB~ disk

     fdisk -l
    
     Disk /dev/xvda: 21.5 GB, 21474836480 bytes
     255 heads, 63 sectors/track, 2610 cylinders
     Units = cylinders of 16065 * 512 = 8225280 bytes
     Sector size (logical/physical): 512 bytes / 512 bytes
     I/O size (minimum/optimal): 512 bytes / 512 bytes
     Disk identifier: 0x00040be1
    
         Device Boot      Start         End      Blocks   Id  System
     /dev/xvda1   *           1        2611    20970496   83  Linux
    
     Disk /dev/xvdd: 67 MB, 67108864 bytes
     255 heads, 63 sectors/track, 8 cylinders
     Units = cylinders of 16065 * 512 = 8225280 bytes
     Sector size (logical/physical): 512 bytes / 512 bytes
     I/O size (minimum/optimal): 512 bytes / 512 bytes
     Disk identifier: 0x00000000
    

  • Mount the drive meta_data.json

     mkdir -p /mnt/configdrive
     mount /dev/xvdd  /mnt/configdrive
    

  • Look at the meta data files

     cat /mnt/configdrive/openstack/latest/meta_data.json | python -m json.tool
    
     cat /mnt/configdrive/openstack/latest/vendor_data.json | python -m json.tool
    
    

  • The yaml file we sent will show up under both these locations.

     less  /mnt/configdrive/openstack/latest/user_data
     less /var/lib/cloud/instance/cloud-config.txt 
    

  • Unmount - A good admin never leaves unwanted drives mounted :)

     umount /mnt/configdrive
    

  • Runcmd arguments from the Yaml file will also show under scripts.

     less /var/lib/cloud/instance/scripts/runcmd  
    

  • The status is also nicely provided.

     less /var/lib/cloud/data/status.json
    

  • Review logs

     #If you have the example 1 output config
     less /var/log/cloud-init-output.log 
    
     #Ubuntu
     less /var/log/cloud-init.log 
    
     #CentOS
     grep "CLOUDINIT" /var/log/messages
    

• Run example 2 & see if /home/demo/.chef/knife.rb was created

  key=sri-key
  nova boot --flavor=general1-1 \
  --image=518d156d-d4e0-483d-a7db-89cd27b50180 \
  --key-name $key \
  --config-drive=true \
  --user-data=example2.yaml \
  c0003
  

• Other Examples; See example 3 & example 4

• Read the (docs)[https://cloudinit.readthedocs.org/en/latest/]