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 cluster on several servers.
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Scripting
ZooInspector: zookeeper graphic interface
I just created a pre-compiled zooinspector, and tested it working well on CentOS and macOS, and should work on windows too.
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Install Go 1.7 on Linux The generic way
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.
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How To Install and Configure Rocket.Chat on CentOS
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 well as mobile applications for iOS and Android. Developers can also use hubot to integrate […]
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Whois: command line query for spam-infected domains
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 competing registrars. Go to http://www.internic.net for detailed information. GITHUB.COM.KHALEDELANSARI.COM GITHUB.COM [..]
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Extract and Compress 7z files in command line
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 official website:
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Smart ways to purge a RabbitMQ queue
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?
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RabbitMQ: remove node from cluster
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 remotely from the reset nodes. Here suppose we have a cluster consist of three RabbitMQ […]
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Determine the up time of an TCP connection on Linux
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 some luck finally. Note that it’s limited to TCP and UDP.
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ZooKeeper: The Four Letter Commands
ZooKeeper responds to a small set of commands. Each command is composed of four letters. When we issue the commands to ZooKeeper via telnet or nc, we would get corresponding response.
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