Talk about Ansible and Infrastructure as Code

Ansibleの話と、ユルいInfrastructure as Codeの話

Satoshi TAGOMORI (@tagomoris)2014/10/03

SATOSHI TAGOMORI (@TAGOMORIS)

黒ラベルうまあああああああああああああああああああああいいいいいいいいいいいいいい！！！！！！！！！

Ansibleansible

operate servers by module & arguments$ ansible SERVERS \ -m yum \ -a ‘name=bash state=latest’

ansible-playbook

yaml playbook$ ansible-playbook playbooks/update_packages.yaml

playbook

---- include: ansible.yaml- hosts: all-centos-servers gather_facts: False tasks: - yum: name=openssl state=latest - yum: name=bash state=latest

See also: http://www.slideshare.net/tagomoris/ansibleja

Iterative authorization1.execute “ansible” steps 1-by-1 on a server

1. if it failed, fix arguments

2. if it succeeded, add it on playbook

2.complete playbook

3.run playbook on another server

4. run playbook on all servers

Very flexible!Variable expansion

all yaml values are jinja2 template!

variables from playbook, inventory, facts(servers)

Conditionals

execute it only when ...

Loops

“shell” & “command” modules

Don’t shoot yourself in the foot :(

Too much flexibility brings destruction...

Infrastructure as Code

Write code to struct our IT infra

Infra? Server?

Using IaaS: Network configuration as Code?

On-premise: Datacenter as Code ...

Server as Code

1. server deployment by code

Only code deploy servers

Blue-green deployment

Code knows all of server status

We must write all as code

2. GMs + setup code

Golden Master server images for general purpose

OS minor versions are not determined

It’s not problem whether GM is from code or not

Setup code has 2 layer

Compatibility layer for GM differences

Deployment layer for applications

3. Stateful servers + codeServers have state and be eventually changed

Everything are different from each other

Minimum code for limited parts of server status

For applications

Fragile parts: routing, ssh keys, monitoring agents

To be patched: security updates

Middleware deployment: Hadoop, Presto, Fluentd

Just start to write minimum code :)

As same with web or other apps!