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admins = { "[email protected]" }
privileged_entities = {
    ["[email protected]"] = {
        roster = "both";
        message = "outgoing";
        presence = "roster";
    },
}
plugin_paths = { "/etc/prosody/prosody-modules" }
modules_enabled = {

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In case you want to run ansible (or ansible-playbook) command against a set of hosts that makes sense only for one run, you can don't bother to create one-time inventory file, but simply define a comma-separated list of hosts as argument of --invertory option (or its short form that's simply -i) as follows:

ansible --inventory=myhost1,myhost2,myhost3 all -m setup -a 'filter=*name*'

(note that all in this command line stands for the target hostname)

If you have only one host to run your playbook against, your inventory string must ends with ,

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Useful LXD commands

Summarized from https://stgraber.org/2016/03/19/lxd-2-0-your-first-lxd-container-312/.

Interestingly, the LXD command line client is named.... lxc!

List available containers

lxc image list ubuntu:        # ubuntu: is officially supported image source
lxc image list images:        # images: is an unsupported source
lxc image alias list images:  # lists user-friendly names

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How to create a LXD Container with your ssh key in it (and with ssh server in the container)

Create a brand new ed25519 key pair

ssh-keygen -o -a 100 -t ed25519

Get the pub key and put the result in your lxd default profile

cat ~/.ssh/ed25519.pub
lxc profile edit default

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Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "[email protected]"

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#!/bin/sh

# Credits: http://stackoverflow.com/a/750191

git filter-branch -f --env-filter "
    GIT_AUTHOR_NAME='Newname'
    GIT_AUTHOR_EMAIL='new@email'
    GIT_COMMITTER_NAME='Newname'
    GIT_COMMITTER_EMAIL='new@email'
  " HEAD

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Story: Writing Scripts with Go

This is a story about how I tried to use Go for scripting. In this story, I’ll discuss the need for a Go script, how we would expect it to behave and the possible implementations; During the discussion I’ll deep dive to scripts, shells, and shebangs. Finally, we’ll discuss solutions that will make Go scripts work.

Why Go is good for scripting?

While python and bash are popular scripting languages, C, C++ and Java are not used for scripts at all, and some languages are somewhere in between.

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example:

PRI = 191

To get the Facility
Divide the PRI number by 8. 
191/8 = 23.875
The whole number part is the facility.

To get the Severity

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Main Queue

This object is available since 7.5.3. It permits to specify parameters for the main message queue. Note that only queue-parameters are permitted for this config object. This permits to set the same options like in ruleset and action queues. A special statement is needed for the main queue, because it is a different object and cannot be configured via any other object.

Note that when the main_queue() object is configured, the legacy $MainMsgQ... statements are ignored.

A Simple Example

main_queue(    
    queue.size="100000"      # how many messages (messages, not bytes!) to hold in memory

queue.type="LinkedList" # allocate memory dynamically for the queue. Better for handling spikes

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#!/usr/bin/env python

"""A message modification plugin to remove credentials

   Copyright (C) 2014 by Adiscon GmbH and Peter Slavov
   Copyright (C) 2016 by Datadog

   This file is part of rsyslog.

   Licensed under the Apache License, Version 2.0 (the "License");