How To

Securing a Zookeeper ensemble

November 30, 2021 – 9:31 pm

Even in secured networks, it’s a good idea to use some of the security features available in Zookeeper. In this post we’ll look at two security mechanisms: mutual TLS (mTLS) and SASL authentication. We’ll set up these security features on the server-server communication (leader election protocols) and client-server communication (Kafta to Zookeeper).

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How To

Building a Zookeeper ensemble

October 28, 2021 – 3:52 pm

Some notes on setting up and configuring a Zookeeper ensemble. Many guides use some shortcuts to setting up the ensemble such as running multiple Zookeeper instances on a single machine or running them in Docker. Both require some workarounds to make it work. As a better example, this guide runs three Zookeeper instances across three different VMs.

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How To

Microsoft Bot Framework Part 3: Connect to channels

September 1, 2021 – 12:00 pm

In the first two parts we built a bot using the Microsoft Bot Framework SDK and registered it in Azure. In this third and final part we’ll consume the bot using three of the available Bot Framework Channels: A simple chat component on a web page, SMS text and a fully custom Node.js application.

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How To

Microsoft Bot Framework Part 2: Build a bot with Bot Framework SDK

August 7, 2021 – 12:49 pm

In the first part, we created an Azure Bot registration and connected to a demo bot application. In this part we’ll swap out the demo bot for one we’ve built using the Microsoft Bot Framework SDK.

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How To

Microsoft Bot Framework Part 1: Create an Azure Bot Resource

July 27, 2021 – 8:33 pm

In this part, I’ll register and configure a bot with Microsoft Azure Bot Service. It might seem odd to start here rather than going straight into the application code. However, getting this step out of the way gives us something simple to play with that works end to end.

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Java Basics

Exception handling in ScheduledExecutorService

May 15, 2021 – 11:03 am

Java’s ScheduledExecutorService allows you to schedule Runnable tasks without having to worry too much about creating Threads. But how do we handle this exception? We have a few options.

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Uncategorized

The epoch was an hour late

January 1, 2021 – 12:00 am

On the moment that is represented as zero in Unix, C, Java and so many other systems, Big Ben did not strike twelve. At midnight on the 1st January 1970, Big Ben struck one.

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How To Java Basics

Execute Around idiom in Java

November 28, 2020 – 5:33 pm

The Execute Around idiom is a pattern that allows you to wrap an action with some standard setup / tear down steps. Examples might include: Execute within a lock: acquire the lock, do the action, release the lock Resource handling: acquire the resource, do the action, close the resource Execute as a user: switch to read more »

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How To Java Basics

Reverse order a Stream in Java

October 23, 2020 – 5:11 pm

How do you reverse order a Stream in Java? There’s no obvious Stream.reverse() method. Is this an oversight in the API? Is there a workaround?

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Docker

Private DNS for Native Windows Docker Container

August 10, 2020 – 9:16 pm

Docker Windows containers have a number of shortcomings, particularly around networking. One serious showstopper is that it doesn’t use the DNS of its host server.

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