Sylwester Lachiewicz slachiewicz

Update, September 2016

OK, you can pretty much ignore what I wrote below this update, because it doesn't really apply anymore.

I wrote this over a year ago, and at the time I had spent a couple of weeks trying to get Kafka 0.8 working with .NET and then Node.js with much frustration and very little success. I was rather angry. It keeps getting linked, though, and just popped up on Hacker News, so here's sort of an update, although I haven't used Kafka at all this year so I don't really have any new information.

In the end, we managed to get things working with a Node.js client, although we continued to have problems, both with our code and with managing a Kafka/Zookeeper cluster generally. What made it worse was that I did not then, and do not now, believe that Kafka was the correct solution for that particular problem at that particular company. What they were trying to achieve could have been done more simply with any number of other messaging systems, with a subscriber reading messages off and writing

TL;DR

sudo pg_dropcluster 9.6 main --stop
sudo service postgresql stop
sudo pg_upgradecluster -m upgrade -k 9.4 main
sudo su postgres -c "/usr/lib/postgresql/9.5/bin/vacuumdb --all --analyze-in-stages"
sudo pg_dropcluster 9.4 main

TL;DR

sudo pg_dropcluster 9.4 main --stop
sudo pg_upgradecluster 9.3 main
sudo pg_dropcluster 9.3 main

Set up L2TP/IPsec VPN on Debian

	yum -y groupinstall 'Development Tools'
	yum -y install wget openssl-devel libxml2-devel libxslt-devel gd-devel perl-ExtUtils-Embed GeoIP-devel

	OPENSSL="openssl-1.0.2j"
	NGINX="nginx-1.11.4-1"

	mkdir -p /opt/lib
	wget https://www.openssl.org/source/$OPENSSL.tar.gz -O /opt/lib/$OPENSSL.tar.gz
	tar -zxvf /opt/lib/$OPENSSL.tar.gz -C /opt/lib

	[
	{
	"_id": "Wildfly-Monitoring-Dashboard",
	"_type": "dashboard",
	"_source": {
	"title": "Wildfly Monitoring Dashboard",
	"hits": 0,
	"description": "",
	"panelsJSON": "[{\"col\":7,\"id\":\"Active-Sessions-Statistics-jboss-hibernate4.war\",\"row\":3,\"size_x\":3,\"size_y\":2,\"type\":\"visualization\"},{\"col\":10,\"id\":\"Datasource-Pool-Statistics-jboss-hibernate4.war\",\"row\":3,\"size_x\":3,\"size_y\":2,\"type\":\"visualization\"},{\"col\":7,\"id\":\"Http-Requests-By-Client-IP\",\"row\":1,\"size_x\":3,\"size_y\":2,\"type\":\"visualization\"},{\"col\":10,\"id\":\"Http-Response-Status\",\"row\":1,\"size_x\":3,\"size_y\":2,\"type\":\"visualization\"},{\"col\":7,\"id\":\"Prepared-Statement-Cache-Statistics-jboss-as-hibernate4\",\"row\":5,\"size_x\":3,\"size_y\":2,\"type\":\"visualization\"},{\"col\":1,\"id\":\"ActiveMQ-Broker-Memory-Metrics\",\"row\":1,\"size_x\":6,\"size_y\":3,\"type\":\"visualization\"},{\"col\":1,\"id\":\"ActiveMQ-Broker-Total-Metrics\",\"row\":4,\"size_x\"

	"""
	Dependencies:

	pip install tabulate simplejson python-cjson ujson yajl msgpack-python

	"""

	from timeit import timeit
	from tabulate import tabulate

	global
	log /dev/log local0
	log /dev/log local1 notice
	chroot /var/lib/haproxy
	stats socket /run/haproxy/admin.sock mode 660 level admin
	stats timeout 30s
	user haproxy
	group haproxy
	daemon
	maxconn 2048

Sylwester Lachiewicz slachiewicz

Update, September 2016

Set up L2TP/IPsec VPN on Debian

Set up IPsec

Set up networking