Ansible

# include order
./ansible.cfg
~/.ansible.cfg
/etc/ansible/ansible.cfg
 
/etc/ansible/ansible.cfg
[defaults]
retry_files_enabled = False
 
cat <<EOF>> ~/.bashrc
export ANSIBLE_VAULT_PASSWORD_FILE=~/.ansible/.vault_pass
export ANSIBLE_STDOUT_CALLBACK=debug
# export ANSIBLE_DEBUG=True
# export ANSIBLE_LOG_PATH=/var/log/ansible.log
EOF
 
DISPLAY_SKIPPED_HOSTS=0

/etc/ansible/ansible.cfg - global default configuration
~/.ansible.cfg - local global configuration
/etc/ansible/hosts - default inventory file

sed -i 's|#host_key_checking = False|host_key_checking = False|g' /etc/ansible/ansible.cfg
 
# /etc/ansible/ansible.cfg or ~/.ansible.cfg file:
[defaults]
host_key_checking = False
 
# variable:
export ANSIBLE_HOST_KEY_CHECKING=False
 
# command line:
ansible-playbook -e 'host_key_checking=False' yourplaybook.yml
 
# format debug output
export ANSIBLE_STDOUT_CALLBACK=debug

for HOST in $(cat /etc/ansible/hosts | grep -v "[\[|#]" | grep -v '^$' | sort -u); do
    ssh-copy-id -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i /root/.ssh/id_rsa.pub root@${HOST}
    ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null ${HOST} apt-get install -y sudo python
done

ansible-playbook /etc/ansible/playbooks/example.yml --limit www.example.com

import - statements are pre-processed at the time playbooks are parsed
include - statements are processed as they encountered during the execution of the playbook

site.yml
webservers.yml
fooservers.yml
roles/
   common/
     files/
     templates/
     tasks/
     handlers/
     vars/
     defaults/
     meta/
   webservers/
     files/
     templates/
     tasks/
     handlers/
     vars/
     defaults/
     meta/

ansible-doc -l
ansible-doc apt -s

ssh_args = -o ControlMaster=auto -o ControlPersist=60s -o UserKnownHostsFile=/dev/null
ssh_args = -o ForwardAgent=yes
 
# install python manual
ansible host_name -i inventory_name -m raw -a "apt-get update && apt-get install -y python-minimal"
 
# configure valut
apg -a1 -m32 -n1 > ~/.ansible/.vault_pass.txt
echo "export ANSIBLE_VAULT_PASSWORD_FILE=~/.ansible/.vault_pass.txt" >> ~/.bashrc
# check vars
find *_vars -type f -exec cat {} \;
 
# check encryption
find -name "*.enc.*" -exec cat {} \;
 
# find encrypted values
find -name *.enc.* -exec ansible-vault view {} \; | grep foo
 
ansible-vault encrypt ~/ansible/host_vars/www.example.com.yml.enc
# https://dantehranian.wordpress.com/2015/07/24/managing-secrets-with-ansible-vault-the-missing-guide-part-1-of-2/

role defaults
inventory file or script group vars
inventory group_vars/all
playbook group_vars/all
inventory group_vars/*
playbook group_vars/*
inventory file or script host vars
inventory host_vars/*
playbook host_vars/*
host facts
play vars
play vars_prompt
play vars_files
role vars (defined in role/vars/main.yml)
block vars (only for tasks in block)
task vars (only for the task)
role (and include_role) params
include params
include_vars
set_facts / registered vars
extra vars

ansible --version | grep "python version"
 
virtualenv ansible
source ./ansible/bin/activate
pip install ansible
 
virtualenv -p python3 ansible
source ./ansible/bin/activate
pip install ansible

ansible-playbook roles/hadoop_primary/tasks/main.yml --step --start-at-task='start service 1'