A Technical I.T./DevOps Blog
Problem scenario
You want to run a basic Lua program as a test. What do you do?
Solution
Prerequisite
You must have installed the Lua compiler. If you are using a CentOS/RHEL/Fedora server, try this link.
Procedures
1. Create a file called contint.lua with the following line:
print(“This is a Hello World program”)
2.
…
Continue reading “How Do You Write a Hello World Program in Lua?”
Problem scenario
You want to test out the Golang compiler. You want to know how to write a basic Go program and run it. What do you do?
Solution
Prerequisites
You must have the Golang compiler installed. If you need help, see this posting.
Procedures
1. Create a file called hw.go with the following five lines:
package main
import “fmt”
func main() {
fmt.Println(“This is a Hello World program!”)
}
2.
…
Continue reading “How Do You Write a Hello World Program in Golang?”
Problem scenario
You want to run Lua programs on your Red Hat derivative distribution of Linux server (e.g., CentOS/RHEL/Fedora).
Solution
1. Make a script like this called lua.sh with the following lines:
yum -y install readline-devel gcc
curl https://www.lua.org/ftp/lua-5.3.5.tar.gz > /tmp/lua-5.3.5.tar.gz
mv /tmp/lua-5.3.5.tar.gz /opt/
cd /opt/
tar -xzvf lua-5.3.5.tar.gz
cd lua-5.3.5
sudo make linux test
echo “ENV=$ENV:/opt/lua-5.3.5/src/” >>
…
Continue reading “How Do You Install the Lua Compiler on a CentOS/RHEL/Fedora Server?”
Problem scenario
You want to be able to create EC-2 instances in AWS with a Python script. How do you do this?
Solution
Prerequisites
This assumes you have installed Boto3. If you do not know how, see this posting.
Procedures
As a reference, you may go here to learn more about Boto’s features: http://boto3.readthedocs.io/en/latest/guide/migrationec2.html
Use this program:
“”” Usage instructions
1. …
Continue reading “How Do You Use Python to Create a Server in AWS?”
Problem scenario
You are trying to install a new package or apply yum updates on a CentOS/RHEL/Fedora server. But you get 404 errors or “pycurl error 22” as the result of your yum commands. How do you use yum to install a new package or apply a new update?
Solution
Run this command: sudo yum clean all
Now your yum commands should work.
…
Continue reading “How Do You Troubleshoot the Message “pycurl error 22”?”
Problem scenario
You want to find the subscription ID for your Azure account. What do you do?
Possible Solution #1
Log into the Azure Portal. In the upper right click on your account and then click on “My permissions.” You should see an alphanumeric string near your subscription.
Possible Solution #2
Prerequisite
If you have Windows 7 you need to install Azure PowerShell;
…
Continue reading “How Do You Find the Subscription ID for an Azure Account?”
Problem scenario
You want to test out Groovy as a scripting language. You want a Groovy program to read in user input and print it out to the screen. How do you do this?
Prerequisite
This assumes that you have already installed Groovy on a Linux server. If you are running a Red Hat derivative (e.g., CentOS, RHEL, or Fedora), click on this link.
…
Problem scenario
You run gcc to compile a C program, but you get this error:
“gcc: error trying to exec ‘cc1plus’: execvp: No such file or directory”
Solution
Install a C compiler. If you do not know how, see this posting.
…
Problem scenario
You have compiled the source code of a Java program into bytecode (with a .class extension). You try to run it (execute the bytecode) with a javac command (javac HelloWorld), but you get “error: Class names, ‘HelloWorld’, are only accepted if annotation processing is explicitly requested
1 error “
What should you do?
Solution
Run it with the java command like this (with no “.class” extension): java HelloWorld
…
Continue reading “How Do You Run a Java Program That Has Compiled Successfully?”
Problem scenario
You want to write a Python program to display the instance IDs of virtual servers in AWS. What do you do?
Solution
Prerequisites
This assumes you have installed Boto3. If you do not know how, see this posting. This assumes that you are running it on a server that has access to AWS (e.g., it has access to the internet).
…
Continue reading “How Do You Find the Instance Ids of Virtual Servers in AWS Using Python?”