A Technical I.T./DevOps Blog
Problem scenario
You have a web server with an external IP address (e.g., a VPS, an EC-2 instance, a DigitalOcean droplet, a VM in Azure or GCP). You have a domain name, e.g., funexample.com, that you have registered. You want to go to craft a URL foobar.funexample.com to resolve to this web server with an external IP address. Right now when you open a web browser and go to foobar.funexample.com, nothing downloads.
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Continue reading “How Do You Use Amazon Route 53 with a Domain Name?”
Problem scenario
You are familiar with codebases in the context of configuration management or version control. How can you invoke “git rebase” to learn more about git?
Solution
If you use the man page for “git rebase” you see this phrase to define “git rebase”: “Forward-port local commits to the updated upstream head”
What does “Forward-port local commits to the updated upstream head” mean?
According to
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Updated on 1/22/19
Problem scenario
You installed Graylog in a Docker container. You open the URL for the server in a web browser. You see this message:
” Server currently unavailable
We are experiencing problems connecting to the Graylog server running on http://127.0.0.1:9000/api. Please verify that the server is healthy and working correctly.
You will be automatically redirected to the previous page once we can connect to the server.
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Problem scenario
You have a variable in a Bash script that helps you compose a new Bash command. You want to create a complex and dynamic Bash command. This variable includes one or more spaces in it.
You can echo the commands and verify that these are valid Linux commands. You run them and they test out. But to run automatically in a script, you are finding that it can be difficult.
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Problem scenario
You are using a Red Hat derivative of Linux (e.g., CentOS/RHEL/Fedora). When trying to run a MongoDB command you receive this message: “error while loading shared libraries: libssl.so.1.0.0: cannot open shared object file: No such file or directory”
What should you do?
Solution
Get different installation media. If you try to install a .tgz file for Ubuntu on CentOS/RHEL/Fedora, you will get this message.
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Problem scenario
You are running a Python program with Boto and you get an error like this:
” aws_access_key_id=AKIAJfoobar9999, NameError: name ‘AKIAfoobar9999’ is not defined”
What should you do?
Solution
Put single quotes around the aws_access_key_id value.
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Problem scenario
You have seen “git branch” and heard of branching strategies. What does “git branch” actually do? How can you use “git branch”?
Solution
In the context of version control or configuration management, branching is a fork of a codebase.
(Forking is the creation of an independent copy of a repository; a branch is the same except it is a copy of a repository within the same repository for the purpose of merging with the main or “trunk” branch.
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Problem scenario
You want to install Groovy version 2 on Debian or Ubuntu Linux. What do you do?
Solution
Run these two commands:
sudo apt-get -y update
sudo apt-get -y install groovy2
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Continue reading “How Do You Install Groovy Version 2 on Debian or Ubuntu Linux?”
Problem scenario
You want to use Grunt the automation tool (https://gruntjs.com). How do you install it and get it to work on Linux?
Solution
#1 If you are using CentOS, Red Hat Enterprise Linux, or Fedora, run these two commands:
sudo yum -y install nodejs npm # *
sudo npm install -g grunt
If you are using Debian or Ubuntu Linux,
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Problem scenario
You want to use Gulp the automation tool (https://gulpjs.com/). How do you install it and get it to work on Linux (either a Debian distribution or a Red Hat distribution)?
Solution
1. If you are using CentOS, Red Hat Enterprise Linux, or Fedora, run these two commands:
sudo yum -y install nodejs npm # *
sudo npm install -g gulp
If you are using Debian or Ubuntu Linux,
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