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Found at: raymii.org:70/Ansible_Deployment_Framework.txt

This is a text-only version of the following page on https://raymii.org:
Title       : 	Ansible - pure ssh based configuration management and deployment
Author      : 	Remy van Elst
Date        : 	09-03-2013
URL         : 	https://raymii.org/s/tutorials/Ansible_Deployment_Framework.html
Format      : 	Markdown/HTML

Ansible is a radically simple model-driven configuration management, deployment,
and command execution framework. Other tools in this space have been too
complicated for too long, require too much bootstrapping, and have too much
learning curve. By comparison, Ansible is dead simple and painless to extend.
Puppet and Chef have about 60k lines of code. Ansibles core is a little over
2000 lines.

I'm developing an open source monitoring app called Leaf Node Monitoring, for windows, linux & android. Go check it out!

Consider sponsoring me on Github. It means the world to me if you show your appreciation and you'll help pay the server costs.

You can also sponsor me by getting a Digital Ocean VPS. With this referral link you'll get $100 credit for 60 days.

#### How do I use Ansible

I used chef to deploy and manage all my vps servers which host the cluster on
which raymii.org is hosted. I've written a chef-bootstrap script to make sure
all the packages to build and compile rvm, ruby and chef are installed, and I've
got my entire cluster in chef cookbooks. It works well, but it is bloated. It
requires ruby on the server nodes, and that sometimes gives problems on the vps
servers I have, since none of them have more than 128MB ram.

I discovered Ansible via reddit, and I'm sold. I've converted the scripts I used
with chef to ansible format, and not only are they shorter, the biggest
advantage is that Ansible does not require ruby on the host. I can start with a
newly installed vps with ssh installed. Nothing more.

_Update 2013-03-09_ I've also contributed a few pieces of code to Ansible,
namely for the apt and yum modules. It is such a great project!

[You can find more about Ansible on their website][2].

Below I'll explain how to install and setup ansible (on debian 6), and I'll give
some examples on how to use it.

### Install ansible

    git clone git://github.com/ansible/ansible.git
    cd ./ansible
    sudo make install

#### You might need some python modules

    sudo easy_install jinja2 
    sudo easy_install pyyaml
    sudo easy_install paramiko

#### Add localhost to test

    source ./hacking/env-setup
    echo "" > ~/ansible_hosts
    export ANSIBLE_HOSTS=~/ansible_hosts

#### Setup ssh-agent

    ssh-agent bash
    ssh-add ~/.ssh/id_rsa

#### Add servers/hosts

Edit the `~/ansible_hosts` file:


##### Make sure to add the ssh-key to the host

    ssh-copy-id -i ~/.ssh/id_rsa.pub '-p 2222 vps3.sparklingclouds.nl'    

#### Test if it works

     ansible all -m ping
    vps1.sparklingclouds.nl | success >> {
    "ping": "pong"
    vps.raymii.org | success >> {
    "ping": "pong"
    vps3.sparklingclouds.nl | success >> {
    "ping": "pong"
    vps5.sparklingclouds.nl | success >> {
    "ping": "pong"
    vps6.sparklingclouds.nl | success >> {
    "ping": "pong"
    vps17.sparklingclouds.nl | success >> {
    "ping": "pong"
    vps7.sparklingclouds.nl | FAILED => FAILED: timed out

It is working. Server vps7 is down, so it reports it correct.

### Examples

###### Get external IP of hosts in groups "nodes" and "master"

    ansible nodes:master -a "wget -qO - http://ifconfig.me/ip" -f 10     
    vps8.sparklingclouds.nl | success | rc=0 >>
    vps11.sparklingclouds.nl | success | rc=0 >>

###### Install a package on all hosts in group "nodes" using apt

    ansible nodes -m apt -a "pkg=nano state=latest"
    vps11.sparklingclouds.nl | FAILED >> {
        "failed": true, 
        "msg": "Could not import python modules: apt, apt_pkg. Please install python-apt package."
    vps1.sparklingclouds.nl | success >> {
        "changed": false

###### Fix the above error

Install package python-apt manually using the "apt-get -y install python-apt"
command. Run it via sudo (-s) as user remy (-u remy) and ask me for the sudo
password (-K)

    ansible -v vps11.sparklingclouds.nl -a "apt-get -y install python-apt" -f 10 -u remy -s -K
    sudo password: 
    vps11.sparklingclouds.nl | success | rc=0 >>
    Reading package lists...
    Building dependency tree...
    Reading state information...
    The following extra packages will be installed:
    iso-codes python-apt-common 
    Setting up python-apt-common ( ...
    Setting up python-apt ( ...
    Setting up iso-codes (3.23-1) ...

### My Playbooks

[I've got my playbooks on my github account. You can see them and use them as
reference, and if you want, improve them.][3].

#### Playbook tips

Get the network inteface (eth0, venet0) in a value (item [0] is lo):

      interface: ${ansible_interfaces[1]}

Variables with quotes:

      compress: '( "application/x-javascript", "text/css", "text/html", "text/plain" )'

Result of a command in a variable:

      date: $PIPE(date)
      hard_command: $PIPE("this_is_a_long_command | which gets piped | and grepped")

Running on CentOS and Debian and have a yum and an apt statement with an if? Use
the pkg_mgr variable:

      pkg_mgr: ${ansible_pkg_mgr}
      - name: Install vim and git with ${pkg_mgr}
        action: $pkg_mgr name=$item state=latest
          - vim
          - git

Have special IPv6 config? Or want general if execution based on variables?
Define a variable (this is in the ansible_hosts file)

    vps5.sparklingclouds.nl:444 ipv6=True
    vps6.sparklingclouds.nl:444 ipv6=True

Now in a template (example for nginx):

    {% if ipv6 == "True" %}
      listen [::]:80 default_server; # ipv6only=on;  
    {% else %}
      listen 80 default_server;
    {% endif %}

This makes sure nginx runs on non-ipv6 nodes.

   [1]: https://www.digitalocean.com/?refcode=7435ae6b8212
   [2]: http://ansible.github.com/
   [3]: https://github.com/RaymiiOrg/ansible


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