This is the piece of my playbook file for the question:
- name: Initialize the Kubernetes cluster using kubeadm
command: kubeadm init --config /etc/kubernetes/kubeadminit.yaml
register: init_output
- name: Copy join command to local file
local_action: copy content={{ init_output.stdout }} dest="./join-command"Currently join-command contains the entire stdout (30+ lines of text) for content. What I want to grab is just the last two lines of init_output.stdout instead of the entire output. I've looked into using index reference (ie. init_output.stdout[#]) but I don't know that the output will always be the same length and I don't know how to use indexes to grab more than one line, but i'm fairly certain that the last two lines will always be the join command. Any suggestions?
Select last 2 lines from the list stdout_lines
- local_action: copy content={{ init_output.stdout_lines[-2:] }} dest="./join-command"It's possible to format the lines in a block. For example
- local_action:
module: copy
content: |
{{ init_output.stdout_lines[-2] }}
{{ init_output.stdout_lines[-1] }}
dest: "./join-command"To append the lines in a loop try
- local_action:
module: lineinfile
path: "./join-command"
line: "{{ item }}"
insertafter: EOF
create: true
loop: "{{ init_output.stdout_lines[-2:] }}"