Variables

Types of variables

Variables, usually refered to as vars, are various kind of values available through devo.ps;

• Services configuration; each service comes with a set of default configuration that you can override. The value of each each of these configuration is available as a variable.

  For example, the NGINX service has a events.worker_connections configuration variable. If that service is installed on the web_1 node, then you should be able to access it at {{ web_1.configuration.nginx.events.worker_connections }}.

• Meta data; some information coming is dynamically assigned to each node upon provisioning.

  For example, the IP address ({{ web_1.ip }})) or devops SSH key ({{ web1.pub_key }}).

• Custom variables; users can define custom variables in the vars attributes of nodes, tasks and tasks commands.

  For example,

Assigning

vars:
  my_var: 123
  my_other_var: ["An", "array", "of", "strings"]
  {{ my_global_var }}: "Something else again"

Reading

• an inline command like

    steps:
      - run: mkdir {{ myvar }} && cd {{ myvar }}
  

• or with a script

    steps:
      - run: devops scripts/some_script.sh
  
    shell> cat ./scripts/some_script.sh
  
    #!/bin/bash
    echo {{ my_other_var }}
  

• or within a package task

    steps:
      - run: devops package some_task
        options:
          some: {{ myvar }}