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AnsibleWorkshopMay2019.pdf
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Andreas Mosti
May 14, 2019
Programming
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250
AnsibleWorkshopMay2019.pdf
https://dipsas.github.io/AnsibleCourse/
Andreas Mosti
May 14, 2019
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Transcript
and infrastructure as code workshop Andreas Mosti
Key takeaways • Infrastructure as Code • Configuration Management •
What can Ansible solve? • What can it not solve? • Enough knowledge to understand the key principles
Dev/Build Runtime
Dev/Build Runtime
Dev/Build Runtime
Dev/Build Runtime
None
The complexity moves
None
None
Site A Site A Replica Site B Replica Site B
• Application platforms / runtimes • Permissions • Users •
Firewall rules • Config Files • Updates • Running Services • Upgrades
• Application platforms / runtimes • Permissions • Users •
Firewall rules • Config Files • Updates • Running Services • Upgrades 20
None
Inconsistent server farms
Platform requirements, «What are we releasing on?»
«We need new environments quickly, in a reproducible fashion»
Automate the infrastructure
Snowflake vs. Phoenix Servers
Infrastructure as code:
Reproducible Environments
Servers in version control
Configuration management
Explicit process
Safety!
Code Review
Baked vs. Fried servers
The usual suspects
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None
Why Ansible?
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None
Open Source
SSH WinRM
Most important:
The correct abstraction (for us)
None
Playbooks push Database Appserver Load Balancer
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Remember: Ansible keeps state
The benefits of Infrastructure as Code: 1) Automation 2) Version
control 3) Code Review 4) Testing 5) Documentation 6) Reuse
The holy grale: Imutable infrastructure
Warning 1:
None
None
None
None
The files don’t represent reality!
None
Warning 2:
If not run often, the system might regress
Part 1: Inventory and connection
SSH WinRM
WinRM Port 5986 Local / AD admin user w. remoting
Powershell 3.0 ConfigureRemotingForAnsible.ps1
SSH Port 22 root / dedicated user(s)
None
None
The Inventory
inventory/Example.inventory
inventory/Testlab18.inventory
Exercise 1: Inventory and server connection
Part 2: Playbooks and tasks
Playbooks push Database Appserver Loadbalancer
LoadBalancer.yaml Zookeeper.yaml Solr.yaml Database.yaml ArenaAppServer.yaml
WebServer.yaml
WebServer.yaml
WebServer.yaml
WebServer.yaml
roles/DotNet461/tasks/main.yaml
None
None
Exercise 2: Playbook and simple tasks
Part 3: Roles and variables
WebServer.yaml
To reuse tasks or implement components, we make roles
Example roles: • IIS • DotnetFramework45 • Oracle12C • TeamcityAgent
• Java • GoogleChrome • SplunkForwarder
None
Buildserver.yaml
roles/Oracle12Driver/tasks/main.yaml
roles/Oracle12Driver/tasks/main.yaml
roles/Oracle12Driver/defaults/main.yaml
Lists and iterators
roles/Zookeeper/tasks/main.yaml roles/Zookeeper/defaults/main.yaml
A word on variable precendence
From least to most important: • role defaults • group_vars/
• host_vars/ • host facts • play vars • include_vars • set_facts • extra vars
A word on state and idempotency
Always pick modules over shell commands (if possible)
roles/MKDocs/tasks/main.yaml
roles/MKDocs/tasks/main.yaml
Exercise 3: Roles, variables and iterators
Part 4: Handlers, templates, files
None
Files vs Templates
roles/TeamCityAgent/tasks/main.yaml
True configuration management with templating and JINJA2
roles/TeamCityAgent/templates/buildAgent.properties
roles/SplunkForwarder/templates/input.conf.j2
roles/HAProxy/templates/haproxy.conf.j2
roles/Prometheus/templates/alertmanager.yml.j2
roles/Prometheus/defaults/main.yml
roles/TeamCityAgent/tasks/main.yaml
roles/TeamCityAgent/handlers/main.yaml
Exercise 4: Templates, handlers and files
Part 5: Ansible Vault
When working with secrets roles/TeamCityAgent/tasks/main.yaml
roles/TeamCityAgent/defaults/main.yaml
None
roles/TeamCityAgent/defaults/main.yaml
None
roles/TeamCityAgent/defaults/main.yaml
Exercise 5: Vault and encryptet secrets