![Use patterns quickly and effectively - Continued
Wildcards work
one*.com:dbservers
So can Regex
~(web|db).*.example.com
But would this work?
www[01:50].example.com, db-[a:f].example.com](https://image.slidesharecdn.com/tipsandtricksmeetup2018-05-17-180521191046/85/Simple-Tips-and-Tricks-with-Ansible-22-320.jpg)
![Moving Drive letters in a Puppet Manifest
vars:
alphabet: "abcdefghijklmnopqrstuvwxyz"
tasks:
- block:
- name: change disk names
replace:
path: /etc/puppet/example/{{ hostname
}}.yaml
regexp: 'sd{{ alphabet[item | int + 1] }}'
replace: 'sd{{ alphabet[item | int] }}'
with_sequence: start=0 end=11](https://image.slidesharecdn.com/tipsandtricksmeetup2018-05-17-180521191046/85/Simple-Tips-and-Tricks-with-Ansible-24-320.jpg)
![TASK [command]
*********************************
[WARNING]: Consider using yum module rather
than running yum
changed: [localhost]
@KeithResar](https://image.slidesharecdn.com/tipsandtricksmeetup2018-05-17-180521191046/85/Simple-Tips-and-Tricks-with-Ansible-27-320.jpg)
Simple Tips and Tricks with Ansible
- 1. Mike Dahlgren - miked@redhat.com Tips and Tricks
- 3. @KeithResar Automating F5 Load Balancers Automating your F5 Local traffic managers using Ansible. Ready to run your first playbook? Come and see what F5 Networks has been up to with ansible playbooks. We will discuss and demo all the cool things you can automate on your BIG-IP. ...presented on June 21st
- 4. @KeithResar
- 5. @KeithResar
- 6. @KeithResar
- 7. Mike Dahlgren - miked@redhat.com Now for the Tips and Tricks
- 8. Running Commands in Parallel
- 9. PARALLELISM AND STRATEGIES COMMANDS Number of forks can easily be defined with -f (default is 5) $ ansible webservers -a "/sbin/reboot" -f 10 Strategies can be used to control play execution an can be changed • Lineary strategy = in order execution (Default) • Free strategy = finish as fast as you can - hosts: all strategy: free tasks: ...
- 10. Removing Files & Directories
- 11. Removing a file from a server Easy for one File: $ ansible webservers -m file -a "dest=/path/to/file state=absent"
- 12. Removing all the files and directory - name: remove files and directories file: state: "{{ item }}" path: "/srv/deleteme/" owner: 1000 # set your owner, group, and mode group: 1000 mode: '0777' with_items: - absent - directory
- 13. Overloading the Ansible config
- 14. Set Defaults in a custom Ansible configuration file. • No need to type -i myhosts from the CLI • Remove the useless .retry files • Can be used anywhere you run Ansible Precedence model: * ANSIBLE_CONFIG (an environment variable) * ansible.cfg (in the current directory) * .ansible.cfg (in the home directory) * /etc/ansible/ansible.cfg
- 15. Forking background processes from the command line
- 16. TIME LIMITING BACKGROUND OPERATIONS Run script in background (30 Min timeout) $ ansible webserver -B 3600 -P 0 -a "/bin/long_cmd --do-stuff" Checking on the status of a previous job $ ansible web1.example.com -m async_status -a "jid=488359678239.2844" We can set how often to poll the status (60 seconds) $ ansible webserver -B 1800 -P 60 -a "/bin/long_cmd --do-stuff"
- 17. Clean up your debugging tasks
- 18. Clean up your debugging tasks - debug: msg: "This always displays" - debug: msg: "This only displays with ansible-playbook -vv+" verbosity: 2
- 19. Use smoke tests
- 20. Don’t just start services -- use smoke tests - name: check for proper response uri: url: http://localhost/myapp return_content: yes register: result until: '"Hello World" in result.content' retries: 10 delay: 1
- 21. Use Patterns
- 22. Use patterns quickly and effectively - Continued Wildcards work one*.com:dbservers So can Regex ~(web|db).*.example.com But would this work? www[01:50].example.com, db-[a:f].example.com
- 23. Abusing Regex
- 24. Moving Drive letters in a Puppet Manifest vars: alphabet: "abcdefghijklmnopqrstuvwxyz" tasks: - block: - name: change disk names replace: path: /etc/puppet/example/{{ hostname }}.yaml regexp: 'sd{{ alphabet[item | int + 1] }}' replace: 'sd{{ alphabet[item | int] }}' with_sequence: start=0 end=11
- 26. Flow Control in Templates {% for port in jmx_ports %} <Connection> ServiceURL "service:jmx:rmi:///jndi/rmi://{{ inventory_hostname }}.example.com:{{ port }}/jmxrmi" Host "{{ inventory_hostname }}.example.com" InstancePrefix "port_{{ port }}" Collect "memory" Collect "threads" Collect "classes" </Connection> {% endfor %}
- 27. TASK [command] ********************************* [WARNING]: Consider using yum module rather than running yum changed: [localhost] @KeithResar
- 28. - hosts: all tasks: - command: yum -y install telnet - yum: name=telnet state=present - command: yum -y install telnet args: warn: False @KeithResar
- 29. What is your favorite Trick?