Role Name: multienv

Description: A stackable multienvironment directory layout for Ansible using unionfs. Check this Github project with demo data for the environments

There are three methods to run unionfs binary. From unionfs binary in the host, a docker container or a podman container.

Requirements

Using unionfs host binary

• unionfs-fuse

Using docker engine

• Docker
• Docker SDK for Python

Using podman engine

• Podman

• See requirements.txt

Role Variables

Define a stackable environment hierarchy in multienv_union variable using a list. The last environment in the list has the most priority. For example dev:

multienv_union:
  - base
  - dev

For example dev:

multienv_union:
  - base
  - production

More than two directories can be stacked. For example, to stack stage over dev and base:

multienv_union:
  - base
  - dev
  - stage

For the rest of variables:

• See defaults/main.yml.

Dependencies

• Centos: if using Centos and getting a message like 'is mounted on / but it is not a shared mount', you may need to make multienv_host_mountpoint a shared mount point with mount --make-rshared <multienv_host_mountpoint>. Replace <multienv_host_mountpoint> with the respective value
• Depends on other Ansible roles: no

Example Playbook

- hosts: all
  roles:
    - jobcespedes.multienv

Run it with docker:

ansible-playbook -i localhost, multienv.yml

Run it with podman:

# podman method requires sudo
ansible-playbook -i localhost, multienv.yml -e multienv_method=podman -K

Run it with binary in host:

ansible-playbook -i localhost, multienv.yml -e multienv_method=binary

Unmount it

ansible-playbook -i localhost, multienv.yml -e multienv_stop=true

License

Apache 2.0

Author Information

Job Céspedes: jobcespedes@gmail.com