Ansible playbook shell output

Question

I would like to quickly monitor some hosts using commands like ps,dstat etc using ansible-playbook. The ansible command itself perfectly does what I want, for instance I'd use:

ansible -m shell -a "ps -eo pcpu,user,args | sort -r -k1 | head -n5" 

and it nicely prints all std output for every host like this:

localhost | success | rc=0 >> 0.0 root     /sbin/init 0.0 root     [kthreadd] 0.0 root     [ksoftirqd/0] 0.0 root     [migration/0]  otherhost | success | rc=0 >> 0.0 root     /sbin/init 0.0 root     [kthreadd] 0.0 root     [ksoftirqd/0] 0.0 root     [migration/0]  

However this requires me to keep a bunch of shell scripts around for every task which is not very 'ansible' so I put this in a playbook:

--- -   hosts: all   gather_facts: no   tasks:     - shell: ps -eo pcpu,user,args | sort -r -k1 | head -n5 

and run it with -vv, but the output baiscally shows the dictionary content and newlines are not printed as such so this results in an unreadable mess like this:

changed: [localhost] => {"changed": true, "cmd": "ps -eo pcpu,user,args | sort -r -k1  head -n5 ", "delta": "0:00:00.015337", "end": "2013-12-13 10:57:25.680708", "rc": 0, "start": "2013-12-13 10:57:25.665371", "stderr": "", "stdout": "47.3 xxx    Xvnc4 :24 -desktop xxx:24 (xxx) -auth /home/xxx/.Xauthority -geometry 1920x1200\n ....  

I also tried adding register: var and the a 'debug' task to show {{ var.stdout }} but the result is of course the same.

Is there a way to get nicely formatted output from a command's stdout/stderr when run via a playbook? I can think of a number of possible ways (format output using sed? redirect output to file on the host then get that file back and echo it to the screen?), but with my limited knowledge of the shell/ansible it would take me a day to just try it out.

Answer 1

The debug module could really use some love, but at the moment the best you can do is use this:

- hosts: all   gather_facts: no   tasks:     - shell: ps -eo pcpu,user,args | sort -r -k1 | head -n5       register: ps      - debug: var=ps.stdout_lines 

It gives an output like this:

ok: [host1] => {     "ps.stdout_lines": [         "%CPU USER     COMMAND",         " 1.0 root     /usr/bin/python",         " 0.6 root     sshd: root@notty ",         " 0.2 root     java",         " 0.0 root     sort -r -k1"     ] } ok: [host2] => {     "ps.stdout_lines": [         "%CPU USER     COMMAND",         " 4.0 root     /usr/bin/python",         " 0.6 root     sshd: root@notty ",         " 0.1 root     java",         " 0.0 root     sort -r -k1"     ] } 

Answer 2

This is a start may be :

- hosts: all   gather_facts: no   tasks:     - shell: ps -eo pcpu,user,args | sort -r -k1 | head -n5       register: ps      - local_action: command echo item       with_items: ps.stdout_lines 

NOTE: Docs regarding ps.stdout_lines are covered here: ('Register Variables' chapter).