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# in playbook:
- name: install redis server
      apt: name=redis-server state=present update_cache=yes
      # apt-get update && apt-get install redis-server
      tags:[redis, initial]

# run only tasks with tag
ansible-playbook playbook.yml -i inventory.ini -t redis
# don't run tasks, only check
ansible-playbook --check playbook.yml -i inventory.ini -t redis
# run tasks excluding some tags
ansible-playbook --check playbook.yml -i inventory.ini --skip-tags redis