Setup OpenDNS for your Home Network

In a recent project, I started using OpenDNS over other available options. Initially, my home network was using my ISP’s DNS servers. They’re slow and do almost nothing to keep my information safe. So, why, OpenDNS?   Websites load faster and have a guaranteed uptime of 100%.  Its highly customizable, allowing users to pick and choose […]

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Slow SSH Login | UseDNS=no

Problem: When SSH’ing into a server, connection, and login take a long time. Connect to a server Attempt to log in, and wait to see how long the connection takes. 10+ seconds is too long and should be investigated. Wait for the password prompt and then proceed to  cat /etc/ssh/sshd_config | less use vi to […]

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System Load

Your server or computer is currently running slower than normal. You know that its been online for days or even weeks. So, you’ re Troubleshooting Here are the commands and steps you can use to troubleshoot a machine that is running slow or is freezing up constantly. uptime Uptime is a command used to view […]

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Troubleshooting a slow system

Problem A server or computer is currently running slow, but you are able to log into it. You want to see what is causing the problem. Troubleshooting Here are the commands and steps you can use to troubleshoot a machine that is running slow or is freezing up constantly. uptime Uptime is a command used […]

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Wireshark | Getting Started

Wireshark is an open source packet analyzer, software analysis, network troubleshooting tool. What does it do? Wireshark allows its user to view raw data that is being transmitted over a network. Its main purpose is to encapsulate network packets so they can be analyzed for troubleshooting an issue. How is it different from TCPdump? Wireshark is […]

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FILE SYSTEMS AND HIERARCHIES

Linux File System A file system is the method and data structures that an operating system uses to keep track of files on a disk or partition. Basically how things will be stored. Before a partition or disk can be used as a file system, it needs to be initialized, and the bookkeeping data structures […]

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Compress a file with tar

Last time we spoke about unzipping an archive/compressed with tar. This time we’re going to show you how to compress a file with tar. Tar as you know it is most commonly used for unzipping compressed files and unzipping archived files. Both archived files and compressed files contain multiple files combined into one. This makes […]

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TAR | EXTRACTING FILES

Archiving combines several files into one file. While compressing combines several files into a smaller file. Key difference being that a compressed file is stored in a smaller file. Why is compressing a file useful? It helps package up many files into one file. This can save space and helps when sending files from one […]

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FSCK – FILE SYSTEM CHECK

File System Check, is a tool used to check and repair one or more Linux file systems. Fsck is best used when a device is receiving I/O errors. Alternatively, one can use it to just check the file system as a precaution You can use the -A option to automatically start checking all file systems […]

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