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SysAdmin Series – What is proc-buddyinfo?

Published on : May 4, 2019 by

SysAdmin Series – What is proc-buddyinfo?

Preface:

Primary memory or Linux is not considered as a single block by Linux Kernel. Instead it is fragmented or may be a better word here would be divided or differentiated into different zones inside nodes. Zones can vary depending on the architecture. We will be considering only 64 bit for learning purposes. Nodes are how […]

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SysAdmin Series – Explaining mpstat Command Output

Published on : May 1, 2019 by

SysAdmin Series – Explaining mpstat Command Output

Preface:

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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SysAdmin Series – What does ksoftirqd do ?

Published on : April 29, 2019 by

SysAdmin Series – What does ksoftirqd do ?

Preface:

Operating System manages and controls I/O operations and I/O devices. Let’s have a quick overview of different ways of interacting with I/O devices, before we go through what a ksoftirqd does. Interrupts – The CPU issues commands to the I/O module then proceeds with its normal work until interrupted by I/O device on completion of […]

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When does DNS use TCP / UDP?

Published on : April 26, 2019 by

When does DNS use TCP / UDP?

Preface:

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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cPanel: Find Duplicate Domains in Servers

Published on : April 24, 2019 by

cPanel: Find Duplicate Domains in Servers

Preface:

One of our client needed to enable DNS cluster for his web servers. Before enabling cluster we have to make sure there are no duplicate accounts in the server. In many cases, accounts were migrated across the servers and the previous ones were not deleted. So, when enabling the cluster, the DNS of the first […]

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