Enable etcd user and password based authentication about tendrl-ansible HOT 7 CLOSED

Ok, so I need to generate new password via ansible first:

$ cat password.yml                                                                                                     
---                                                                                                                    
- hosts: localhost
  connection: local
  tasks:
    - debug: msg="{{ lookup('password', '/dev/null chars=ascii_letters length=30') }}"

https://docs.ansible.com/ansible/latest/playbooks_lookups.html#the-password-lookup

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There is no ansible module for etcdctl, so I need to test if it's ok to run these commands over and over again.

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@r0h4n what file do you mean by this:

Add the etcd_username and etcd_password to all Tendrl service config file

At this point, only etcd is installed, so I would assume that the changes in tendrl config files are described later on, as we install and configure them.

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@mbukatov Keep this entire auth thing optional, user should be able to run unsafe etcd too (for devs/testing etc)

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@r0h4n ok, let's have an ansible variable to control this, with auth enabled as a default (so that for dev/testing, one can turn it off)

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Blocked Keeping etcd auth disabled is blocked by Tendrl/api#294 (I updated the pull request so that enabling etcd auth will work, but disabling will not, until Tendrl/api#294 is fixed).

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Addressed in #35

But as pointed out in a previous comment, it's not possible to start with etcd auth disabled until Tendrl/api#294 is fixed.

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