Can I set a variable on one host and use them on other hosts?

[Benjamin Bauer]

I'm writing a playbook to restore the latest backup of my DB on all my Database servers. This is done in two main steps:

1. figure out which backup is the latest (once)
2. download that file to all DB servers
3. ...and run the restore
   

While step 2 and 3 are straight forward, my problem is to acquire the correct filename once and share it among all DB hosts.

I was trying something like this for testing, but I cant access `last_mongo` on the DB hosts.

---
- hosts: localhost
  tasks:
    - name: get filename of latest mongo backup
      shell: s3cmd ls s3://my_backup_bucket/production/ | awk 'NF{p=$4}END{print p}'
      register: lmongo
    - set_fact: last_mongo="{{lmongo.stdout}}"
- hosts: db
  tasks:
    - debug:
        msg: "mongo: {{latest_mongo}}"

Is there a (idiomatic) way to make this variable accessible to the db hosts?

[Benjamin Bauer]

Update:

I figured it out:

---
- hosts: localhost
  tasks:
    - name: get filename of latest mongo backup
      shell: s3cmd ls s3://my_backup_bucket/production/ | awk 'NF{p=$4}END{print p}'
      register: lmongo
    - set_fact: last_mongo="{{lmongo.stdout}}"
- hosts: db
  tasks:
    - debug:

        msg: "mongo: {{{hostvars['localhost']['last_mongo']}}}"

Is there a better way?

[Serge van Ginderachter]

Yes, use hostvars.localhost.lmongo.stdout

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[Benjamin Bauer]

Thanks for the good adivce!