Getting things done with Ansible

Jesse Keating

@iamjkeating

Ansible

what is it

Ansible

what can it do

Ansible

why Ansible

Easy to get started

Easy to use

Easy to extend

Cow powers

Ansible

orchestration

Execute actions in a certain order

Use data from one execution in a later execution

Rolling app deploy example

- hosts: web
  tasks:
    - name: run webapps on 8082
      docker: image=appv2 command="service nginx start" ports=8082:8080
              state=present

    - name: insert new into load balancer
      rax_clb_nodes: load_balancer_id=5 address={{ inventory_hostname }}
                     port=8082 condition=enabled type=primary
      delegate_to: localhost

    - name: test local server
      wait_for: port=8082

    - name: remove old webapps version
      rax_clb_nodes: load_balancer_id=5 address={{ inventory_hostname }}
                     port=8081 state=absent

    - name: remove old webapps version
      docker: image=appv2 command="service nginx start" ports=8081:8080
              state=absent

Ansible

config management

On-system configuration

Webapp configure example

- hosts: localhost
  tasks:
    - name: install packages
      yum: pkg={{ item }} state=present
      with_items:
        - nginx
        - syslog-ng

    - name: configure nginx
      template: src=templates/nginx.conf.j2 dest=/etc/nginx/nginx.conf

    - name: configure syslog-ng
      copy: src=files/syslog-ng.conf dest=/etc/syslog-ng.conf

    - name: enable services
      service: name={{ item }} state=enabled
      with_items:
        - nginx
        - syslog-ng

    - name: get webapp content
      git: dest=/srv/webapp/ version={{ version }} depth=1
           repo="git://git.server/webapp.git"

Ansible

provisioning

Create infrastructure to manage

Provisioning example

- hosts: localhost
  tasks:
    - name: launch web instances
      rax: name=web0{{ item }}.mydomain flavor=performance1-1
           image=webapp.mydomain key_name=provision state=present
           wait=true
      register: newnodes
      with_sequence: 5

    - name: add nodes to runtime inventory
      add_node: name={{ item.instances[0].name }} group=webs
                ansible_ssh_host={{ item.instances[0].rax_accessipv4 }}
      with_items: newnodes.results

- hosts: webs
  tasks:
    - name: configure stuff....

Ansible

remediation

Self healing systems

Ansible

ad-hoc remote execution

One-off actions

Shellshock example

$ ansible -i myinventory.py all-linux -m yum -a "name=bash state=latest" -f 500 -vv

Ansible

advantages

Ansible

learn more