Export An Env Var To Container With Ansible

ansible

I'd like to export an environment variable to Docker using Ansible (preferably) that has a value of a command substitution, e.g.

export SSH_AUTH_SOCK=`cat /root/file.txt`

file.txt's content changes from time to time, therefore I need the command substitution to dynamically change the var's value.

What is the way to achieve such thing ? I tried

env:
  SSH_AUTH_SOCK="`cat /root/file.txt`"

but it appended the literal string rather than its value.

Best Answer

You can use the pipe lookup plugin:

environment:
  SSH_AUTH_SOCK: "{{ lookup('pipe', 'cat /root/file.txt') }}"

^{Remember lookup plugins are executed locally on the control machine, not on the target server. If the target server if different, you need to register the value in a separate task, as the other answer suggests.}

^{Note also that you should use YAML notation to declare the environment dictionary (and it's not env).}

Related Solutions

How to see stdout of ansible commands

I think you can register the result to a variable, then print with debug.

- name: print to stdout
  command: echo "hello"
  register: hello

- debug: msg="{{ hello.stdout }}"

- debug: msg="{{ hello.stderr }}"

Adding a user to an additional group using ansible

According to the User module you can use this:

- name: Adding user {{ user }}  
  user: name={{ user }}
        group={{ user }}
        shell=/bin/bash
        password=${password}
        groups=sudo
        append=yes

You can just add the groups=groupname and append=yes to add them to an existing user when you're creating them

Best Answer

Related Solutions

How to see stdout of ansible commands

Adding a user to an additional group using ansible

Related Topic