bgyu / ansible_tutorial

Ansible Tutorial

Ansible configuraitons

• ansible.cfg : basic configurations
• inventory: inventory file to define server nodes

1. Run adhoc ping module

# Use full command without configuration file
ansible all --key-file ~/.ssh/id_rsa_ansible -i inventory -m ping
# Use configuration file ansible.cfg to save typing.
ansible all -m ping --extra-vars "ansible_user=ben"

• all means use all hosts defined in inventory file.
• --key-file specify ssh private key file
• -i inventory, specify what server nodes the comand applies to
• -m means module, here we are using module ping.
• --extra-var specify extra variables passed to ansible.

If your current user name is different from ssh user name, then you need to speficy ansible_user via --extra-vars options. If your current user name is the same with ssh user name, then you don't need to specify ansible_user.

2. Run adhoc gather_facts module

# gather all nodes facts
ansible all -m gather_facts --extra-vars "ansible_user=ben"

# gather specific node facts
ansible all -m gather_facts --limit 192.168.0.61 --extra-vars "ansible_user=ben"

3. Run sudo apt update

ansible all -m apt -a update_cache=true --become --ask-become-pass --extra-vars="ansible_user=ben"

# install vim-nox
ansible all -m apt -a name=vim-nox --become --ask-become-pass

# update snapd to latest
ansible all -m apt -a "name=snapd state=latest" --become --ask-become-pass

# update all packages
asnible all -m apt -a "upgrade=dist" --become --ask-become-pass

• -m apt to run apt command in Ubuntu
• --become to add sudo permission
• --ask-become-pass prompt for sudo password

4. Use playbook

ansible-playbook --ask-become-pass --extra-vars="anisble_user=ben" install_apache.yml

# run playbook with tags
ansible-playbook --tags web --ask-become-pass install_apache.yml


# run playbook without --ask-become-pass
# We can do this because in ansible.cfg, we use `remote_user` as simone
# and user simone is a sudoer, and no password is needed due to /etc/sudoers.d/simone
ansible-playbook site.yml