A Technical I.T./DevOps Blog
Goal You want to use unzip when you are using SUSE (either openSUSE or SUSE Linux Enterprise).
Background
The unzip character-based utility is useful for many reasons. At the command line you can access compressed files that normally occupy little space on the disk. Transferring .zip files is great for keeping network bandwidth utilization low.
Try this command to see if unzip is installed: unzip –version
AWS SUSE servers have unzip installed by default,
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Goal: You want to use zip when you are using SUSE (openSUSE or SUSE Linux Enterprise). You want to use the character (or command) prompt. You do not want to use the GUI.
Background: The zip character-based utility is useful for many reasons. At the command line you can free up space while retaining files for future usage. Try this command to see if zip is installed: man zip
Part 1 Installation Process
If the command cannot be found,
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How do you unzip files using Red Hat Enterprise Linux (or CentOS or Fedora Linux)?
Goal: You want to use unzip when you are using Red Hat Enterprise Linux (or CentOS or Fedora Linux).
Background: The unzip character-based utility is useful for many reasons. At the command line you can access compressed files that normally occupy little space on the disk. Transferring .zip files is great for keeping network bandwidth utilization low.
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Continue reading “How do you unzip files using RHEL (or CentOS or Fedora Linux)?”
Goal: You want to use zip when you are using Red Hat Enterprise Linux (or CentOS or Fedora Linux).
Background: The zip character-based utility is useful for many reasons. At the command line you can free up space while retaining files for future usage. Try this command to see if zip is installed: man zip
Part 1: How to install zip?
If the command cannot be found,
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Continue reading “How do you zip files using Red Hat Enterprise Linux (or CentOS or Fedora Linux)?”
Goal: You want to issue a command (e.g., an export command) that has a password in it. But you do not want anyone looking over your shoulder to see it. You do not want the password to be visible in the history of the shell.
Solution: Type this ‘read -s foobar’
Then press enter. The cursor will go to the next line. Type in the password.
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Continue reading “How Do You Assign a Password to a Variable In Linux Without Making It Visible?”
Problem scenario: When trying to use PowerShell to download a file, get you this error ‘Error calling “DownloadFile” with “2” argument(s): “An Exception occurred during a WebClient request.”‘
Solution: Make sure you have ample space on the disk and make sure the destination folder exists. A typo in the path or if the folder not existing could cause this error. Insufficient disk space could also cause the problem.
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Continue reading “How to Troubleshoot PowerShell Downloading a File From the Internet”
Updated 1/5/18
THESE DIRECTIONS ARE OUTDATED. They are here as a reference for legacy purposes only. For directions on how to install Hadoop on a RedHat or CentOS server, see this article.
Problem scenario
You want to install an open source version on a RedHat derivative distribution of Linux in a public cloud. How do you do this?
Solution
These directions will allow you install Hadoop on a RedHat derivative (e.g.,
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These “directions” to install Suricata on SUSE Linux include a script and how to run it. The script was designed to install Suricata 3.1dev on an AWS instance of SUSE 12 SP1. This script was based on these here. This script requires that your AWS SUSE Linux server is in a security group that has access to the Internet. The script takes approximately five minutes to run. But bandwidth and resources on your instance may vary.
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Continue reading “How to Install Suricata on an AWS Instance of SUSE Linux”
Problem scenario: On Ubuntu, after installing Hadoop, when you enter the command ‘/usr/local/hadoop/bin/hadoop namenode -format’ and you get this error:
“Error: JAVA_HOME is not set and could not be found.”
Solution: Verify Java is installed (‘java -version’). If it is not installed, you can use ‘apt-get install -y default-jre’.
Next, go to hadoop-env.sh. Find the export JAVA_HOME stanza. Change the ‘${JAVA_HOME}’ value to ‘/usr’ with no quotes.
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Continue reading “How To Get Hadoop Installed on Ubuntu When There Is a Java Error”
Problem scenario
When you log into Ubuntu, you see a message like this:
8 packages can be updated.
5 updates are security updates.
You run this: sudo apt-get -y update
This completes. But next time you log in, you see the same message about 8 packages can be updated. What do you do?
Solution
Run this command: sudo apt-get -y upgrade
If you are looking for deploying Hadoop to Ubuntu,
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