wait_for module

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1

Hi,

After rebooting the host and need to check if that process is back online.
Is there a way in ansible (or “wait_for module” ) to check the service or process to be running after a reboot. could you please share your insight about it.Thank you…

2

For the reboot you can use

- name: Restart server
  shell: sleep 2 && /sbin/shutdown -r now
  async: 1
  poll: 0

If you can use wait_for depends on what your process is doing,
wait_for can do many things you find it in the documentation[1].

To check if a service is running you have service module that can do that.

[1] https://docs.ansible.com/ansible/latest/wait_for_module.html

3

Thanks Kai , looking for something like the server is rebooted and looks for the processes or service and then move to the next server reboots and check the service and goes to the next hosts and does the same.

4

You can do something like this.

  - shell: sleep 2 && /sbin/shutdown -r now
    async: 1
    poll: 0

  - wait_for:
      port: 22
      host: '{{ inventory_hostname }}'
      search_regex: OpenSSH
      delay: 10
    delegate_to: localhost

  - service:
      name: service-name
      state: started
    check_mode: yes
    register: r

  - fail:
      msg: Something went wrong
    when: r.state != 'started'

But if your process is listening on a port that you can check, then you can use wait_for directly.

5

Thanks Kai for that insight , i have taken out the port=22 and include the timeout=600 option in wait_for module in order to check the services by login to server. Also can we set different timeout values for different host in wait_for module.Can you please throw some light as i am created a playbook for reboot and calling it in other playbook by specifying specific host. like below but its not working .

6

Thanks Kai for that insight , i have taken out the port=22 and include the
timeout=600 option in wait_for module in order to check the services by
login to server. Also can we set different timeout values for different
host in wait_for module.

You can have a variable for each host that you specify the timeout.

Can you please throw some light as i am created a
playbook for reboot and calling it in other playbook by specifying specific
host. like below but its not working .

There is a lot of errors in your playbook, you should read up on YAML file syntax.
http://docs.ansible.com/ansible/latest/YAMLSyntax.html

And then study the other examples you find all over the documentation and remember to pay attention to the indentation since that is very important in YAML.

---
tasks:
   shell: sleep 2 && shutdown -r now
   async: 1
   poll: 0
   ignore_errors: true

This is a task file, it can't have "tasks:" in it.
Remove the tasks and add a dash in front of the shell line and make sure the indentation is correct.

server.yml

---
- name: for the individual hosts
- hosts: 192.168.3.154 <========( This server requires to wait for the server to come online after reboot )

Since you are using the name, you can't have the dash on hosts:

  tasks:
   include: tasks/restart1.yml

The include is missing a dash, and need to be indented properly.

   - name: wait for the server to be online
     local_action: wait_for host={{ inventory_hostname }} state=started delay=5 timeout=120

- hosts: 192.168.3.153 <============ ( this server doesnot require to wait for the server to come back after reboot )
  tasks:
   - include: tasks/restart1.yml

Here the indentation is incorrect.

7

Thanks Kai for sorting this out. I have rectified the indentations & other corrections and its working now …will add more logic to get the desired output.Appreciate your prompt help Kai…