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@dmccuk
dmccuk / ansible_failed_hosts.md
Last active April 17, 2024 13:39
For when you need Ansible to give you a list of unreachable or failed hosts

How to get a list of failed or unreachable hosts

This is in response to this stackoverflow question The solution was posted by Vladimir Botka.

  • YouTube walkthough here

When Ansible runs, it's great for setting up and configuring servers as per your playbooks and roles. But have you ever needed to collect a list of failed hosts where Ansible wasn't able to connect to them? In this demo I'm going to show you how to collect a list of failed and unreachable hosts.

My setup:

I'm simply using a list of servers that don't exist, along with one remote server that I can get to.

@cdoan1
cdoan1 / Performance_Scale_Sizing_Worksheet.md
Last active March 4, 2022 19:10
Sizing Worksheet

Sizing Worksheet

I am writing this article to document data related to sizing classification for RHACM 2.2 deployments.

We define three generic size classifications, based on the number of managed clusters under management.

Then, we deploy RHACM 2.2 into each of the size classifications, and measure the system based on the workload.

Today, we will keep the workload very generic.

@lilongen
lilongen / run-ansible-with-any-host-without-inventory
Last active May 5, 2023 23:16
How to run Ansible without specifying the inventory but the host directly?
Question:
. How to run Ansible without specifying the inventory but the host directly?
. Run a playbook or command with arbitrary host not in the inventory hosts list?
. run ansible with arbitrary host/ip without inventory?
Answer:
Surprisingly, the trick is to append a ,
The host parameter preceding the , can be either a hostname or an IPv4/v6 address.
ansible all -i example.com,
@carlos-jenkins
carlos-jenkins / multihooks.py
Last active August 10, 2023 22:12
Delegating script for multiple git hooks
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright (C) 2015-2017 Carlos Jenkins <carlos@jenkins.co.cr>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
@richardcornish
richardcornish / git.md
Last active August 11, 2023 08:44
Enough Git for your résumé in 100ish lines
@andreyvit
andreyvit / tmux.md
Created June 13, 2012 03:41
tmux cheatsheet

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a