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WildFly remediation with Event-Driven Ansible

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                          |___/

Widfly Mini Conference 20/11/2024

Romain "Belaran" Pelisse, Senior Software Engineer @Red Hat

Presented using Slides

About me

  • Open Source enthousiast for all my career
  • Works for Red Hat since 2011
  • Works in Open Source and JBoss ecosystem since 2005
    • Started with JBoss AS 3.25 👴👴👴
  • Passionate about Linux and Automation (since 2011)
    • started with Puppet, feel in love with Ansible
    • since 2019 leading an initiative to integrate Red Hat Runtimes into Ansible 

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  • If you know what Shadowrun is, you might know me for something else...

Last time, on Wildfly Mini Conf...

  • We saw how to install Wildfly in fully automated fashion using Ansible.
  • What is Ansible?
    • An Open Source, python based and crossplatform automation solution
    • No code, but YAML descriptor:
- name: "An Ansible playbook to setup SSHd"
  hosts: localhost
  vars:
    sshd_pkg_name: openssh-server
  tasks:
    - name: "Ensure {{ sshd_pkg_name }} is installed"
      ansible.builtin.package:
        name: "{{ sshd_pkg_name }}"
        state: present
    - name: "Ensure service is running"
      ansible.builtin.service:
        name: sshd
        state: running

Demo 0 - Installing Wildfly with Ansible

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    / ======= \
   / __________\
  | ___________ |
  | | -       | |
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  | |_________| |________________________
  \=____________/                        )
  / """"""""""" \                       /
 / ::::::::::::: \                  =D-'
(_________________)

Going further... Event-Driven Ansible!

The power of automation

  • Now, we have an automation infrastructure that will keep our deployment in the proprer state
  • Let's leverage this to implements remediation using Event-Driven Ansible (EDA)

What is EDA?

  • one
  • two
  • three

Demo 1 - Restart Wildfly is server is down

  • Let's write a simple rulebook to leverage Event Driven Ansible (EDA) to automatically restart Wildfly if it's no longer running...

  • (simple use case, but we do need to start somewhere...)




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                                                `--)-(--`
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                                        jgs   `-=========-`()

Demo 2 - Restart on Java Out of Memory!

  • Restarting Wildfly if it's down is nice, but we can do far more than that.
  • Historically, Java apps were sometimes plagued by out of memory errors, that required a restart
  • Let's implement a remediation strategy, using EDA, for this common problem




                                            _.-^^---....,,--
                                        _--                  --_
                                       <                        >)
                                       |                         |
                                        \._                   _./
                                           ```--. . , ; .--'''
                                                 | |   |
                                              .-=||  | |=-.
                                              `-=#$%&%$#=-'
                                                 | ;  :|
                                        _____.,-#%&$@%#&#~,._____

Demo 3 - Flush db connection if the app reports idle connection

  • An app has a bug leading to leave some db connection idled
  • The bug has not yet been identified (or the fix is not released)
  • An easy fix is to flush the idle db pool when the problem is detected
  • Let's implement that remediation strategy with EDA

Demo 4 - Undeploy a broken app

  • An app can be broken and when it is, it has to be removed
  • And unregister from the web balancer (not in the demo)
  • Wildfly state must check after app removal

Thanks!






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