ANSIBLE VARIABLES

include global variables for all Roles

sample playbook

splunk/

   setup_splunk_playbook.yaml

   roles/base

           /tasks/main.yaml

           /tasks/install.yaml

         search_head

           /tasks/configure.yaml

         indexer

           /tasks/configure.yaml

         some_other_role

           /tasks/some_task.yaml

   hosts

   config.yaml

Place your vars into config.yaml

cat splunk/config.yaml

--- 

# global Splunk variables

splunk_version: 7.0.0

in your playbook, include the Roles

cat setup_splunk_playbook.yaml

- hosts: "search_heads"  

  become_user: root

  become: true

  gather_facts: true

  roles:

    - base

    - search_head

in your Role, include the Global Vars inside a Task

cat roles/base/tasks/main.yaml

---

# install Splunk Base

- name: include vars

  include_vars: "{{ playbook_dir }}/config.yaml"

- include: install.yaml

vars are accessible in tasks now,

cat roles/base/tasks/install.yaml

- name: echo version

  debug: splunk version is {{ splunk_version }}

Loop through a Dict variable inside a playbook

cluster:

  members:

    splunk01: 10.123.1.0

    splunk02: 10.123.1.1

    splunk03: 10.123.1.2

in the playbook, 

- debug: msg="{{ cluster.members.values() | map('regex_replace', '(.*)', 'https://\\1:8089') | join(',') }}"

>> https://10.123,1.0:8089, https://10.123.1.1:8089, etc etc

Use Inventory file variables inside a playbook

cat hosts

[apache]

nycweb01

playbook

debug: msg="IP: {{ hostvars[groups['apache'][0]]['ansible_default_ipv4']['address'] }}"

debug: msg="Hostname: {{ hostvars[groups['apache'][0]]['inventory_hostname'] }}"

register a List/Array to be used for later,

- name: parse all hostnames in group WebServer  and get their IPs, place them in a list

  command: echo {{ hostvars[item]['ansible_ssh_host'] }}"

  with_items: "{{ groups['webserver'] }}"

  register: ip_list

- name: show the IPs

  debug: msg={{ ip_list.results | map(attribute='item') | list }}"

export an Environment variable

- name: yum install

  yum: name=somepkg state=present

  environment: 

    SOME_VAR: abc

Ansible JOBS AND PROCESS CONTROL

run Ansible ad hoc with 10 parallel forks

ansible -i hosts testnode1 -a "uname -a" -f 10

show human readable output
add this line to ansible.cfg

stdout_callback=yaml

Ansible PACKAGES AND INSTALLATION

#install multiple packages

yum: name="{{ item }}" state=present

with_items:

  - http 

  - htop

  - myapp

Ansible SERVER DIAGNOSTICS

Test Connection

ansible -i hosts all -m ping -u root

Diagnostics

manage nodes via "/etc/ansible/hosts" file

Debug (debug output for playbook)

- debug: var=result verbosity=2  

Ansible REMOTE CMD (Ad Hoc)

Ping specific node

ansible -i hosts nycweb01.prod.local -m ping

Ping with wildcard

ansible -i hosts "nycweb*" -m ping

Ping all nodes with SSH user 'root'

ansible -i hosts all -m ping -u root

run a command

ansible -i hosts dev -a 'uname -a'

check Yum packages

ansible -i hosts dev -m yum 

check if Docker rpm is installed

ansible -i hosts web01.nyc.local -m shell -a "rpm -qa | grep docker"

Get facts about a box

ansible -i hosts web01.nyc.local -m setup -a 'filter=facter_*'

run command with sudo

ansible -i hosts target-host -m shell -a "cat /etc/sudoers" --sudo 

limit command to a certain group or server: add --limit *.nyc

Copy your Ansible Master's public key to the managed node

ssh-keygen  ## generate public key

ssh-copy-id <name of node>  # copy key, provide password to node




uninstall any application in windows 10 via cmd

Below example is to uninstall onedrive

1. Open Command Prompt as Administrator

2. Type in taskkill /f /im OneDrive.exe to terminate any OneDrive processes and hit Enter.

3. Type in %SystemRoot%\SysWOW64\OneDriveSetup.exe /uninstall if you’re using 64-bit Windows 10 and hit Enter.