Im registering with Ansible output from network checking in such way:
- name: Test kube networking shell: kubectl exec -n iperf -it {{ item }} /test.sh loop: "{{ pods.stdout_lines }}" register: echo - debug: msg={{ item.stdout_lines }} loop: "{{ echo.results }}" and now how to go trough all of entries? I want to have all "stdout_lines" from every result as item. Is such thing posible? Or maybe some "nested" loop one over results and second trough all stdout_lines from every result?
Whenever I run into situations like this for ansible I stop and look for a better approach.
For example there is a 'script' module. If you write a nice script that outputs some json you can then import the output from that command as a ansible fact with the 'from_json' filter. This way you do the hard work in your favorite language and get your facts perfectly arranged so they are easy to loop through.
But to attempt to answer your question.. I am guessing you want to have all the stdout_lines from the kubectl command combined into a single long list. This should do it:
- name: Test kube networking shell: kubectl exec -n iperf -it {{ item }} /test.sh loop: "{{ pods.stdout_lines }}" register: echo - set_fact: stdout_lines: [] - set_fact: stdout_lines: "{{ stdout_lines + item.stdout_lines }}" with_items: "{{ echo.results }}" - debug: msg: "This is a stdout line: {{ item }}" with_items: "{{ stdout_lines }}" 
Test kube networkinglooks like, and what you actually want it to look like.