A Technical I.T./DevOps Blog
Problem scenario
You want to move copies of all the files in a given subdirectory (we’ll say /tmp/a/ for an example) on a Docker host to go into a Docker container.
Solution
From the server use the command “docker ps” to find the container ID. Now that you have the container ID, you can write a script to move copies of the files into the Docker container.
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Continue reading “How Do You Copy Many Files from Your Linux Server into a Docker Container?”
Updated on 12/26/18
These directions show how to install Docker on SUSE Linux. These commands are for installing Docker 1.x on an AWS instance of SUSE 15. These directions require that your AWS SUSE Linux server is in a security group that has access to the internet. (If you want to see more directions for install Docker on different distributions of Linux in different public clouds, see this posting.)
Step #1
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Continue reading “How To Install Docker on an AWS Instance of SUSE Linux?”
Problem scenario: When someone uses a .pp file (either through a puppet agent call from a Puppet Agent node or via a puppet apply on a Puppet Master server), what order can a human DevOps Engineer expect the order to be?
Answer: The execution order of a given manifest is the top of the manifest is executed and Puppet works its way down from there. ContinualIntegration.com tested and verified this,
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Continue reading “What is the Order of Execution of a Puppet Manifest?”
Updated on 6/8/20
This version is the unabridged version. For the abridged version, you may click here.
Problem scenario
A Puppet manifest is not working, but there are no obvious error messages. When running the puppet agent command, you use the -d flag for debugging. In your manifest, you use logoutput => true stanza. But still, you cannot figure out why your manifest is not working.
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Problem scenario: Using Bash you want to compute kB, MB, and GB with decimal values. But you only seem to be able to do arithmetic on integer values.
Root cause: Bash does not support “float” arithmetic with values to the right of the period. Decimal values cannot be calculated.
Solution: Install the bc utility/language (e.g. yum -y install bc). It is often used in Bash to augment the numeric processing features.
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Continue reading “Doing Bash Arithmetic with Greater Precision than Integer Values”
Question: What Should Be Done About the Discrepancies Between Local Group Policy Editor and the Registry Settings?
Solution: Nothing. To open the Local Group Policy Editor in Windows Server 2012, either go to PowerShell and type “gpedit.msc” with no quotes. Or without PowerShell go to the Windows button on the desktop and go to the search field. Search for “gpedit” with no quotes. Click on the result (usually just one).
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Problem scenario
You want to upload files into Nexus 3 running in a Docker container. You installed Nexus 3 with Docker 1.9 using these directions. The OS is CentOS 7.2. The web UI for Nexus 3 works via Docker, but you cannot upload files into any repository. When you go to Repositories, but you do not see the “Artifact tab.” How do you upload files?
Solution
Prerequisite
Install Docker;
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Continue reading “How Do You Upload Files to Nexus 3 in a Docker Container on Linux CentOS?”
Updated on 1/1/18
You may want to see this different posting that works for Linux SUSE as well as other non-SUSE distributions of Linux.
Problem scenario
You want to install the open source version of Hadoop 3.0.0 on Linux SUSE 12 SP3. What do you do?
Solution
These directions would work on a non-SUSE distribution if you install Java a different way from the first command in the script.
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Problem scenario
You want to download a very large file using PowerShell (from a file share on your network or URL on the Internet). But the file is larger than the available RAM on your server. How do you download a large file using Powershell?
Solution
Invoke-restmethod, Invoke-webrequest, curl and wget (even with the redirect “” command) all put the file being downloaded into memory. If RAM is scarce on your system or the file is very large,
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Continue reading “How Do You Download Big Files with PowerShell?”
Problem scenario: You go to the Start menu and type in the box “malicious” or “Windows Malicious Software Removal Tool” and no program shows up. You go to “Programs and Features” in the “Control Panel” but you cannot find anything with the word “Malicious” in it. How do you run Windows Malicious Software Removal Tool?
Solution from a command prompt: Open a command prompt (hold the Windows button and tap “r”).
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Continue reading “How do you run Windows Malicious Software Removal Tool?”