Cloud init Theory and Tutorials

cloud-init

Cloud Init is one of the automated configuration tool that does the automation of services at the boot up

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# Reference URLS
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http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/view/head:/doc/examples/cloud-config.txt
http://cloudinit.readthedocs.org/en/latest/topics/examples.html

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Cloud init DSL
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apt_update: true
apt_upgrade: true

packages:
 - apache2
 - rsync
 
### this import the key from the launchpad username
ssh_import_id: [user1, user2]

### this will add each entry to the authorized keys list
ssh_authorized_keys:
  - ssh-rsa keydescription

### this will enable the byobu terminal

byobu_by_default: system | user

#### This will runcmd 

runcmd:
 - [ wget, "www.google.com", -O, /tmp/index.html ]
 
####### Setting the Hostname

hostname: testing
fqdn: testing.example.com
manage_etc_hosts: true


### Adding users

users:
  - name: test
    groups: test
    shell: /bin/bash
    sudo: ['ALL=(ALL) NOPASSWD:ALL']

### Addign groups
groups:
  - group1
  - group2: [user1, user2]
  
###changing the password

chpasswd:
  list: |
    user1:password1
  expire: False
  
### Writing files to a specified location
 write_files:
   - path: /test.txt
     content: |
       Hello World.


### Upgrading all the packages 

  package_upgrade: true
  

#### Managing the resolve.conf file

manage-resolv-conf: true
resolv_conf:
  nameservers:
    - '8.8.8.8'

#### rebooting the machine

power_state:
  timeout: 120
  delay: "+5"
  message: Rebooting in five minutes
  mode: reboot