Best method of storing shell output to variable to use on other hosts?

[Tony Owens]

I'm looking for some tips on the best way to store a variable persistently across all hosts or multiple plays.

I am attempting to create a docker swarm manager using something similar to this:

1. - hosts: swarm-init
2. gather_facts: no
3. tasks:
4. - shell: docker swarm init
5. - shell: docker swarm join-token -q manager
6. register: manager
7. - shell: docker swarm join-token -q worker
8. register: worker

I would run this play once and don't have that logic built yet but I have not been able to find a method of storing {{ worker }} in a variable so that I could join the swarm from another host in another play.  Any advice?

[Stephen Granger]

http://docs.ansible.com/ansible/set_fact_module.html

    - name: set fact from hosts output

      set_fact:

       docker_manager: manager.stdout

       docker_worker: worker.stdout

# you may want to just pick out a line too, see the debug for what you may want

    - debug:

        var:

          - worker.stdout_lines

          - manager.stdout_lines

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Steve

[Tony Owens]

Thanks for the tip.  I am much closer but I'm getting some undesirable characters added to the var named "key" I'm setting.

- hosts: swarm-init

  tasks:
    - shell: docker swarm init
    - shell: docker swarm join-token -q manager
      register: manager

    - set_fact:
        manager: "{{ manager.stdout_lines }}"

    - shell: docker swarm join-token -q worker
      register: worker

    - set_fact:
        worker: "{{ worker.stdout_lines }}"
- hosts: swarm-worker
  vars:
    key: "{{ hostvars[groups['swarm-init'][0]]['worker'] }}"
  tasks:
   - shell: "docker swarm join --token {{ key }} {{ swarmmanager }}:2377"

Inventory
[swarm-init]
myhost1
 
[swarm-manager]
myhost1
 
[swarm-worker]
myhost2
 
[swarm-manager:vars]
swarmmanager=myhost1
 
[swarm-worker:vars]
swarmmanager=myhost1

The output:

PLAY ***************************************************************************

TASK [setup] *******************************************************************
ok: [myhost1]

TASK [command] *****************************************************************
changed: [myhost1]

TASK [command] *****************************************************************
changed: [myhost1]

TASK [set_fact] ****************************************************************
ok: [myhost1]

TASK [command] *****************************************************************
changed: [myhost1]

TASK [set_fact] ****************************************************************
ok: [myhost1]

PLAY ***************************************************************************

TASK [setup] *******************************************************************
ok: [myhost2]

TASK [command] *****************************************************************
fatal: [myhost2]: FAILED! => {"changed": true, "cmd": "docker swarm join --token [u'SWMTKN-1-0lanrq32u7f1v47noxftd1ekpzgipo3noufg7ppox3aooqhmqh-3peerw7aalzg8ko13zrqh6hee'] myhost1:2377", "delta": "0:00:00.036979", "end": "2016-08-07 20:20:16.500147", "failed": true, "rc": 1, "start": "2016-08-07 20:20:16.463168", "stderr": "Error response from daemon: invalid join token", "stdout": "", "stdout_lines": [], "warnings": []}


PLAY RECAP *********************************************************************
myhost1   : ok=6    changed=3    unreachable=0    failed=0   
myhost2   : ok=1    changed=0    unreachable=0    failed=1   

FATAL: command execution failed
hudson.AbortException: Ansible playbook execution failed
	at org.jenkinsci.plugins.ansible.AnsiblePlaybookBuilder.perform(AnsiblePlaybookBuilder.java:218)
	at org.jenkinsci.plugins.ansible.AnsiblePlaybookBuilder.perform(AnsiblePlaybookBuilder.java:192)
	at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:78)
	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)
	at hudson.model.Build$BuildExecution.build(Build.java:205)
	at hudson.model.Build$BuildExecution.doRun(Build.java:162)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534)
	at hudson.model.Run.execute(Run.java:1741)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
	at hudson.model.ResourceController.execute(ResourceController.java:98)
	at hudson.model.Executor.run(Executor.java:410)
ERROR: Ansible playbook execution failed
Notifying upstream projects of job completion
Finished: FAILURE

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Steve

[Tony Owens]

I actually got this to work by change key variable to:

1. key: "{{ hostvars[groups['swarm-init'][0]]['worker'] | replace('[u', '') | replace(']', '')}}"
   

What a pia!  Surely i am doing something early in the play that is causing me to have to replace those characters.

[Kai Stian Olstad]

On 08. aug. 2016 02:51, Tony Owens wrote:
> I actually got this to work by change key variable to:
>
>

> 1. key: "{{ hostvars[groups['swarm-init'][0]]['worker'] | replace('[u',

> '') | replace(']', '')}}"
>
> What a pia! Surely i am doing something early in the play that is causing
> me to have to replace those characters.

Your worker is a list so maybe something like this
hostvars[groups['swarm-init'][0]]['worker'][0]

--
Kai Stian Olstad

[Tony Owens]

I am facing an issue where I need to specify hosts like this

1. - hosts: "swarm-init-{{ env }}"

but trying to use that group value in hostvars stanza yields the below error. any suggestions?

1. mtoken: "{{ hostvars[groups['swarm-init-{{ env }}'][0]]['manager'] | replace('[u', '') | replace(']', '')}}"

{"failed": true, "msg": "'dict object' has no attribute 'swarm-init-{{ env }}'"}

[Brian Coca]

hosts: only has access to extra-vars, you cannot get group vars when they depend on the hosts you select in hosts: ....

----------

Brian Coca

[Tony Owens]

{{ env }} is an extra-vars in this instance

[Tony Owens]

This works just fine when I set_fact for "manager" on the desired host.

1. 
   
2. mtoken: "{{ hostvars['myhost.net']['manager'] | replace('[u', '') | replace(']', '')}}"

but I need to be able to get the name of the single host that is in the group passed with something like this. Perhaps i need to step back and regroup and go about this in a different way. Any tips would be appreciated.

1. - hosts: "swarm-init-{{ env }}"

[Tony Owens]

I concede..there is no way to do this without passing an extra var at run time.