This document discusses using Ansible to manage instances on CloudPlatform. It provides an overview of configuration management and why Ansible is useful. It then covers installing and configuring Ansible, including basic terminology. Finally, it discusses using Ansible to deploy CloudStack management servers through a use case and references additional Ansible and CloudStack documentation.

1. September 2016
Using Ansible to manage instances on CloudPlatform
By
Kiran Manohar Chavala
@kiranchavala
kiranchavala@gmail.com

2. © 2016 Accelerite. All Rights R
Agenda
Configuration Management
Why Ansible is required
Installing Ansible
Hands on session on a practicle example of Ansible
Deploying Cloudstack Management server

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Why Configuration management is important
I need these services to be installed and running
I need this configuration file to contain these lines
I need this file to exist in this directory
Centralization of configuration
Creation of reusable template configurations i.e. web servers, database servers, DHCP servers,
Cloudstack management servers

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What is Configuration Management?
Configuration management is the philosophy of defining the state that a server
should be in wrt it’s configuration and using tools that achieve that state
CM gives centralization of configuration data and actions
Configuration Management tools should be idempotent

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hat is Idempotent
erations in mathematics and computer science, that can be applied multiple times without changing the result
yond the initial application.
You need to add the following lines to the default my.cnf:
odb_rollback_on_timeout=1
odb_lock_wait_timeout=600
x_connections=350
A sed command would add the lines
d -i -e '/symbolic-links=0/ ainnodb_rollback_on_timeout=1' -e '/symbolic-links=0/ ainnodb_lock_wait_timeout=600' -
symbolic-links=0/ amax_connections=350' /etc/my.cnf
But if you needed to run your script to update/restore another setting then the addition of these lines would be repeated
A configuration management tool would not add these lines aga

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How Ansible is different then Chef and Puppet
Technical:
Client/Server architecture not required
Only SSH connectivity required (password or public/private keys) making it easier to deploy in
environments
Modules can be in any language capable of returning JSON or key=value text pairs
Has an API
User:
Don’t need to learn a programming language (i.e. Ruby)
Chef and puppet are pull-based by default. Agent installed on the servers periodically check in with a centra
ervice and pull down con

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Basic Terminologies
Host Inventories
Roles
Tasks
Variables (hosts or groups)
Modules
Templates
Playbooks

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nstalling Ansible
Install a centos 6 .x machine
yum install wget
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
sudo rpm -Uvh remi-release-6*.rpm epel-release-6*.rpm
yum install -y ansible

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onfiguring Ansible
um install openssh-server openssh-clients
Yum install git
-keygen -t rsa
-copy-id root@remote machine you want to control
ot@anscont3 playbooks1]# cat hosts
ibleremote ansible_ssh_host=10.104.49.233 ansible_ssh_port=22
ot@anscont3 playbooks1]# cat ansible.cfg
faults]
tfile = hosts
mote_user = root
ate_key_file=/root/.ssh/id_rsa
t_key_checking = False

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Use Case Scenarios
The remote machine should have set of predefined packages installed
https://github.com/fifthecho/CloudStack-Template
git clone https://github.com/fifthecho/CloudStack-Template.git

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Deploying Cloudstack components using Anisble
http://docs.cloudstack.apache.org/en/latest/ansible.html
http://docs.ansible.com/ansible/guide_cloudstack.html
https://github.com/resmo/ansible-cloudstack

12. Thank You!