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Kubernetes 1.7 on CentOS: This is How We Nailed It!

Please Note: If you are looking for a comprehensive, step-by-step guide on installing Kubernetes on CentOS, check out this guide (composed by one of my colleagues) instead. Caution: This blog was originally composed several months ago, when the K8s release cycle was at v1.7.0-alpha.3. As always, K8s has zoomed past us, hence most of the content would be downright obsolete ...

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Let’s Talk About Shell Scripting

Bash is a command-line shell now available on all major operating systems, and it is the environment from which most developers can accomplish the majority of tasks for a system. Many of the commands that need to be executed to complete a task can be grouped together in a script to help avoid repetition when typing the commands. Furthermore, there’s ...

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Managing Windows Services from CLI

In this short guide, I’ll be reviewing the necessary information for how to manage services from the command line on Windows workstations and servers. It should also go without saying that “services” are an integral part of pretty much all computer systems. You should also be aware that “services” are sometimes referred to as daemons (pronounced “demons”), especially in various ...

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Improving Linux System Performance with I/O Scheduler Tuning

In a previous article, I wrote about using pgbench to tune PostgreSQL. While I covered a very common tunable shared_buffers, there are many other tuning options that can be used to gain performance from PostgreSQL. Today’s article is going to cover one of those additional options. However, this tunable does not belong to PostgreSQL. Rather this tunable belongs to the ...

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Bash If-Then-Else Example

This is a Bash If-Then-Else Example. Sometimes you need to specify different courses of action to be taken in a shell script, depending on the success or failure of a command. The if construction allows you to specify such conditions.                   The following table shows an overview of the whole article: Table ...

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Backup & Restore DHCP Server Database Information

In this article, we’ll review the necessary information for how to backup and restore information from a Microsoft Windows DHCP server database. Depending on how familiar you are with this procedure, you may or may not be aware that there’s more to it than just a simple “backup and restore the database”. Besides wanting a full copy of your database, sometimes ...

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Bash If – Statement Example

This is an If – Condition Example. Sometimes you need to specify different courses of action to be taken in a shell script, depending on the success or failure of a command. The if construction allows you to specify such conditions.                   The most compact syntax of the if command is: if ...

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Linux Bash awk Example

This is an awk tutorial. The basic function of awk is to search files for lines or other text units containing one or more patterns. When a line matches one of the patterns, special actions are performed on that line. Programs in awk are different from programs in most other languages, because awk programs are “data-driven”. You describe the data ...

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