problem when I want to run a shell program on remote host in background

[Nguyen Hoang]

Hi Ansible Experts!


I use ansible 2.4.2.0 on linux Centos


I have one problem  when I want to run a shell program on remote host in background

I have a shell program ControllerAgent like that :


[root@157501lepca02 bin]# pwd
/home/neoload69/bin
[root@157501lepca02 bin]# ls -l
total 320
-rwxr-xr-x 1 root     root     13698  7 mars  09:04 ControllerAgent
...

If I run manually  my shell program ControllerAgent as following :

[root@157501lepca02 bin]# nohup /home/neoload69/bin/ControllerAgent </dev/null >/dev/null 2>&1 &
[1] 10147
[root@157501lepca02 bin]#

it works well


But when I want to run my shell program ControllerAgent in a ansible playbook as following :


- hosts: [xx.yyy.tt.xxx]
  become: yes
  remote_user: deploy75
...

- name: Starting  Controller Agent
  shell: sh nohup /home/neoload69/bin/ControllerAgent </dev/null >/dev/null 2>&1 &

...

Nothing  happens, it means that no process of my shell program ControllerAgent is created

Do you have an idea of the problem to help me ?

Thanks a lots

Best regards

Viet

NB : the remote user deploy75 is in the visudo file of the remote machine xx.yyy.tt.xxx like

## Allow root to run any commands anywhere
root    ALL=(ALL)       ALL
deploy75 ALL=(ALL) ALL

[Brian Coca]

You are calling sh while shell already does this, also the nohup is
inside the sh so it won't prevent the disconnection race condition,
you need to execute the nohup directly:

shell:nohup /home/neoload69/bin/ControllerAgent </dev/null >/dev/null 2>&1 &

Also, I don't recommend doing this if you really want to run
backgrounded services like this you should use a service manager
(init.d, systemd, runit, upstart, etc)
----------
Brian Coca

[Nguyen Hoang]

Hi Brian

I have just done what you advice me 

and it works, it is ok now

Thanks  a lot 

Best Regards

Nguyen