A sysadmin needed to update Nginx config on 50 servers. SSH into each one? That is 50 terminal sessions and 50 chances to make a typo.
The Configuration Drift Problem
Manual server management does not scale. Shell scripts help but break silently. Chef and Puppet require agents installed on every server.
Ansible is a free, agentless automation engine. Write YAML playbooks, run them over SSH. No agents to install, no master server required.
What Ansible Offers for Free
- Agentless - Uses SSH, no agent installation needed
- YAML Playbooks - Human-readable automation scripts
- Idempotent - Run playbooks multiple times safely
- 3000+ Modules - Manage files, packages, services, cloud resources, databases
- Roles - Reusable automation packages (Ansible Galaxy)
- Inventory - Dynamic inventory from AWS, GCP, Azure, Kubernetes
- Vault - Encrypt sensitive data (passwords, keys)
- Check Mode - Dry run without making changes
Quick Example
- hosts: webservers
tasks:
- name: Install nginx
apt: name=nginx state=latest
- name: Start nginx
service: name=nginx state=started enabled=yes
- name: Deploy config
template: src=nginx.conf.j2 dest=/etc/nginx/nginx.conf
notify: Restart nginx
handlers:
- name: Restart nginx
service: name=nginx state=restarted
ansible-playbook -i inventory.ini deploy.yml
GitHub: ansible/ansible - 64K+ stars
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