Imagine I have multiple hadoop clusters, each with a master node and a
varying amount of slave nodes connected to it.
I want to dynamically discover the slaves from the master, and then perform
actions on them in serial mode (only impact one node at a time to minimize
downtime).
What's the right way to do this?
An almost-working approach is below, but I have a problem at "xxxxx". If I
hardcode a master node name there, everything works. But I don't want to
since that's silly and
there are lots of clusters. But I don't know how I can pass the master node
name across the plays?
- hosts : hadoop_master_nodes # run this on all master nodes
tasks:
- name: find targets
shell: list_all_my_hadoop_nodes.sh # show list of nodes connected
to this master
register: target_nodes
- set_fact:
target_nodes: "{{ target_nodes.stdout_lines }}" # set a fact so we
can call it from the next step
- hosts: "{{ hostvars['xxxxxxxx']['target_nodes'] }}" # call the list of
target_nodes discovered above
serial: 1
tasks:
- name: do whatever # "do whatever" one at a time across all the
target nodes
.....
--
You received this message because you are subscribed to the Google Groups
"Ansible Project" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/ansible-project/5a6caa7c-84bb-46ec-9740-2dd79c450620%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
