A Technical I.T./DevOps Blog
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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Problem scenario
You would rather not create duplicate terminal windows in your Linux desktop or with PuTTy in Windows. This may be an enforced security policy rather than a preference. Some Linux systems only allow one log on session. Perhaps you want the systems administrator to use the “who” or “w” command to see which users are logged in without seeing more than one session for your user.
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Continue reading “How Do You Use the screen Program in Linux?”
Problem scenario
You want to see the path that network traffic takes from one server to another network endpoint. How do you find the intermediate path from the server your are on to a reachable IP address?
Solution
Use a tracing utility. If your server is running Windows, use tracert. Here is an example of how to use it: tracert 8.8.8.8
If your server is running Linux,
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Problem scenario
You want to add files to a new project in GitLab. You want to do this from the command prompt (not through the web UI). How do you do this?
Solution
This assumes you have a new project created; if you do not know how, see this posting. If you want to import a project, see this posting.
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Continue reading “How Do You Add Files to a New Project in GitLab?”