A Technical I.T./DevOps Blog
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.
How do you use the screen command to have different terminals simultaneously with the requirements above?
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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.
Procedures
1.
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Continue reading “How Do You Add Files to a New Project in GitLab?”
Problem scenario
You want to install MongoDB on an Ubuntu/Debian Linux server. How do you do this?
Solution
1. If you know your distribution of Linux, go to step #2. Otherwise try this command: cat /etc/*-release
2. Do one of the following that corresponds to your distribution of Linux:
On Debian: sudo apt-get -y install mongodb mongodb-server
On Ubuntu 16.x or Ubuntu 17.x run these two commands (that may span three lines):
curl http://repo.mongodb.org/apt/ubuntu/dists/xenial/mongodb-org/3.6/multiverse/binary-amd64/mongodb-org-server_3.6.4_amd64.deb >
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Continue reading “How Do You Install MongoDB on a Debian/Ubuntu Linux Server?”
Problem scenario
You want to install Groovy on CentOS 7.x but no yum repositories are configured for directly installing it. What should you do?
Solution
Run these commands:
sudo yum -y install ant ant-junit antlr-tool apache-commons-cli apache-commons-logging apache-ivy bsf jansi jline junit objectweb-asm tomcat-jsp-2.2-api tomcat-servlet-3.0-api xstream
curl http://rpmfind.net/linux/centos/7.4.1708/os/x86_64/Packages/groovy-1.8.9-7.el7.noarch.rpm > /tmp/groovy-1.8.9-7.el7.noarch.rpm
sudo rpm -i /tmp/groovy-1.8.9-7.el7.noarch.rpm
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