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Ansible

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Helena Rasche

Questions

Objectives

last_modification Last modification: Apr 6, 2021

Configuration Management

Manages the configuration of machines.

Specifies what software is installed, how it is configured

Speaker Notes


Why Configuration Management?

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Configuration Management goals

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Ansible

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Important Terms

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Inventory File

Defines the systems (called “hosts”) against which Ansible will work.

[webservers]
192.168.0.1
192.168.0.2 ansible_user=ubuntu

[databases]
db_1.example.org ansible_user=root

Speaker Notes


Ansible Module and Tasks

A module is a piece of code that Ansible can execute on a host, collecting return values.

A task is an invocation of single module with its configuration.

---
- copy:
    src: foo.conf
    dest: /etc/foo.conf
    owner: foo
    group: foo
    mode: 0644

- package:
    name: ntpdate
    state: present

Speaker Notes


Role

.pull-left[ A collection of:

]

.pull-right[ with a predefined directory structure:

.
├── defaults
│   └── main.yml
├── files
│   └── cvmfs_wipecache.centos_7
├── handlers
│   └── main.yml
├── meta
│   └── main.yml
├── README.md
├── tasks
│   ├── apache.yml
│   ├── main.yml
│   └── stratumN.yml
├── templates
│   └── stratum1_squid.conf.j2
├── tests
│   ├── inventory
│   └── test.yml
└── vars
    └── main.yml

]

Speaker Notes


Playbook

A YAML file listing a set of tasks and/or roles that should be applied to a group of hosts.

.pull-left[

.pull-right[

- name: CVMFS
  hosts: all
  vars:
    cvmfs_role: client
    galaxy_cvmfs_repos_enabled: true
  roles:
    - geerlingguy.repo-epel
    - galaxyproject.cvmfs

]

Speaker Notes


Vault

$ANSIBLE_VAULT;1.1;AES256
63333238633033313664633437316231323932326531386266636637353037313335613563663934
6639666536653631363739383639633165633337393334630a353233393938646539306362633738
61613439366435336230636561663864323765303663666239613430323534333665636665643964
6537376666323333660a663233343565393166373665366138306661343764623561343634656463
31636265303430623731643766346434323565663436626466353765393465376533376366356463

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Ansible Philosophies

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Ansible Galaxy

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Key Points

Thank you!

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