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I use Slack for many things and it’s great to see so many integrations are available out of the box. But building integrations yourself is extremely easy using its Incoming Web Hooks. Wouldn’t it be nice if you could see a…
How to install OpenShift Origin on CentOS-7

When I try to build a OpenShift Origin cluster, I noticed that it’s a bit hard to have an intimate knowledge of its installation. This post focused on this topic, and describes how to use openshift-ansible to install an Origin…

Go language is designed for writing servers, that’s why it is using widely. Go has released latest version 1.7. This tutorial will help you to install Go 1.7 on your Linux systems.

Rocket.Chat is one of the most feature-rich open-source Slack alternatives, featuring group chat, direct messaging, private rooms, desktop notifications, media embedding, link previews, file uploading, voice/video chat, screensharing, and more. There are native applications for Windows, Mac, and Linux, as…

When run whois in command line, we sometimes cannot get the expected whois information, but something like below, $ whois github.com Whois Server Version 2.0 Domain names in the .com and .net domains can now be registered with many different…

Extract and Compress 7z files in command line 7-Zip is a file archiver with a high compression ratio. The file compressed by 7-Zip has an extension ”.7z”. Here is a list of main features of 7-Zip, which is from its…

In a recent benchmark, we got a very large queue in one of our online RabbitMQ cluster, which had more than 20mm messages in a single queue (occupying 5-6 gigabytes memory). Then how can we purge the large queue effectively?

When a node is no longer meant to be part of a RabbitMQ cluster, we’d remove it explicitly from the cluster. To remove a node from a cluster, there are basically two ways, get itself remove locally, or remove it…

As a typical use case for troubleshooting, we may need to find out the up time of an established socket connection. Well, how can we do that inside a running Linux system? I faced this issue this afternoon, and got…