Luca Filipozzi LucaFilipozzi

Creating opentelemetry tracing data from an haproxy access log

Approach

Unfortunately, otelcol currently has no receiver for logfiles that produces tracing data. There is log tailing functionality, and e.g. a fluent forward protocol receiver, but they all create "log" data, not tracing. I've seen this proof of concept to implement a forward receiver that creates tracing data, but that seems to have no traction and no relation to the upstream project at all (not even git history.

Thus, we've settled on this approach:

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LUA Record Type for Lua-powered DNS records for standards based fail-over and geographical load balancing

GitHub branch -> https://github.com/ahupowerdns/pdns/tree/luarec

Recently, many zone owners could not migrate away from Dyn since they were benefiting from non-standardised DNS-based failover and geographical loadbalancing features. What you see below is an attempt to get standards based but flexible equivalents of these currently proprietary features. Here is a zone:

$TTL 60
lua.br. IN      SOA     a.lua.br. nstld.verisign-grs.com. (
        2016032300      ; Serial
        14400           ; Refresh

Gracefully Deprecating TLS 1.0

TL;DR: I explain how to detect TLS 1.0 connections and, by way of custom headers, warn the user about the coming change to more modern TLS versions.

Background
How you can prepare

Nginx
Apache
f5
HAProxy
IIS / .NET

TMUX - Single window group, multiple session.

So I have been using tmux for a while and have grown to like it and have since added many many customizations to it. Now once you start getting the hang of it, you'll naturally want to do more with the tool.

Now tmux has a concept of window-group and session and if you are like me you'll want multiple session that connects to the same window group instead of a new window group every time. Basically I just need different views into the same set of windows that I have already created, I don't want to create a new set of windows every time I fire up my terminal.

This is the default case if you simply use the tmux command as your login shell, effectively creating a new group of windows every time you start tmux.

This is less than ideal because, if you are like me, you fire up one-off terminals all the time and you don't want all those one-off jobs to stay running in the background. Plus sometimes you need information fro


	# Debian 10
	aws ec2 describe-images \
	--region us-east-1 \
	--owners 136693071363 \
	--filters 'Name=name,Values=debian-10-amd64-*' \
	--query 'sort_by(Images, &CreationDate)[-1].[ImageId,Name,CreationDate]' \
	--output text

	##

	package main

	import (
	"fmt"
	"log"
	"net"
	"time"

	"github.com/hashicorp/yamux"
	)

	package proxy

	import (
	"io"
	"log"
	"net"
	)

	func Proxy(srvConn, cliConn *net.TCPConn) {
	// channels to wait on the close event for each connection

	VERSION=0.20.6

	sudo apt-get update
	sudo apt-get install openjdk-6-jdk

	wget https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-$VERSION.deb
	sudo dpkg -i elasticsearch-$VERSION.deb

	# be sure you add "action.disable_delete_all_indices" : true to the config!!

	default['sshd']['sshd_config']['AuthenticationMethods'] = 'publickey,keyboard-interactive:pam'
	default['sshd']['sshd_config']['ChallengeResponseAuthentication'] = 'yes'
	default['sshd']['sshd_config']['PasswordAuthentication'] = 'no'