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The gen_nodes ansible role

The gen_nodes ansible role is used to let us generate certain target files we need upon bringup. The amount of files it generates will depend on the features you have enabled.

The gen_nodes ansible role uses jinja2 template engine supported by ansible to generate output files. A file uses the template jinja2 processing by just using one ansible task. You provide the source file, and the output file. That's it. You then codify in the template file what you need using jinja2, and so can leverage variables in your extra_vars.yaml based on your configuration.

The gen_nodes ansible role is in charge of generating node specific files. The amount of files generated will depend on if you are using local virtualization (vagrant) or cloud (terraform). We document both below.

For both cases we always generate the KDEVOPS_NODES file based on the jinja2 template KDEVOPS_NODES_TEMPLATE.

Overriding KDEVOPS_PLAYBOOKS_DIR and KDEVOPS_NODES_ROLE_TEMPLATE_DIR

Although the gen_nodes ansible role is used to generate the nodes files, you can override this if you need to. The default settings are set at the top level Makefile.

export KDEVOPS_PLAYBOOKS_DIR := playbooks
KDEVOPS_NODES_ROLE_TEMPLATE_DIR := $(KDEVOPS_PLAYBOOKS_DIR)/roles/gen_nodes/templates

KDEVOPS_NODES and KDEVOPS_NODES_TEMPLATE

The KDEVOPS_NODES and KDEVOPS_NODES_TEMPLATE is a top level Makefile variable set to empty at first.

If you have local virtualization enabled vagrant then we default these:

  • KDEVOPS_NODES as vagrant/kdevops_nodes.yaml
  • KDEVOPS_NODES_TEMPLATE is set to the jinja2 template $(KDEVOPS_NODES_ROLE_TEMPLATE_DIR)/kdevops_nodes_split_start.j2.yaml.

If using a cloud environment terraform will set these to be other files:

  • KDEVOPS_NODES as terraform/nodes.tf
  • KDEVOPS_NODES_TEMPLATE as $(KDEVOPS_NODES_ROLE_TEMPLATE_DIR)/terraform_nodes.tf.j2

Furthermore, your workflow can override this to something different if needed.

Docs for each are split up: