Linux

SysAdmin Series – Explaining mpstat Command Output

Published on : May 1, 2019 by

SysAdmin Series – Explaining mpstat Command Output

Sometimes, you might have noticed high load on the CPU even though there is no unusual process running. mpstat is a useful command to monitor the CPU, it would tell you the CPU statistics. How the workload is balanced across the processors, whether a process is single threaded or not etc. The first processors will […]

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When does DNS use TCP / UDP?

Published on : April 26, 2019 by

When does DNS use TCP / UDP?

When does DNS use TCP / UDP? This is an age-old interview question. A general answer is DNS uses TCP for Zone transfer and UDP for name queries. But letʼs try to answer why is that? TCP is a connection-oriented protocol whereas UDP is a connection-less protocol. TCP requires the data to be consistent at […]

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Use and examples of Named Pipes

Tags: Linux

Published on : April 6, 2019 by

Use and examples of Named Pipes

Pipe is a method for Inter Process Communication (IPC) which send output of one process to another process. As you know, pipes are of two types: Unnamed Pipes Named Pipes Unnamed Pipe An example of unnamed pipe is as follows: $ ls | wc -l Here output of first command is given as an input […]

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Building up a WordPress website with AWS – PART 5

Published on : April 4, 2019 by

Building up a WordPress website with AWS – PART 5

CONFIGURING WORDPRESS CONTENTS TO LOAD FROM AWS CDN You may have now setup a LAMP server and may have installed WordPress by following the previous parts of the documentation. Now we will configure WordPress contents to load from AWS CDN. The steps involved are. Installing W3 Total Cache Plugin. W3 Total Cache plugin will help […]

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How to check whether UDP connection is open or not?

Tags: Server Managementserver monitoring

Published on : February 12, 2019 by

How to check whether UDP connection is open or not?

UDP is being a connectionless protocol, you can t reliably say that the port is open or not. Below two commands are the only way of checking the same. When you send a packet to the open port, there need not be any acknowledgment saying that the port is open. Theoretically, UDP should give a […]

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