A Technical I.T./DevOps Blog
Problem scenario: You are running gem install *.gem and it hangs. This stalling appears to be a freeze. You wait several minutes and nothing happens. You are waiting for a message or a new prompt.
Solution: Control-C to get out of it. Try it again with the “-V” flag like this:
gem install contInt.gem -V
# This time be patient.
…
Continue reading “This Command “gem install contint.gem” Hangs Forever”
Problem scenario
You want a Perl program to call a Python program to call a Ruby program to call another Python program. You are using Linux as the OS.
Solution
Here is a one-line Perl program (course.pl) that calls a Python program:
system( “python /home/ec2-user/cont.py”);
Here is a two-line Python program named cont.py. It invokes a Ruby program.
import subprocess
subprocess.call([‘ruby /home/ec2-user/integration.rb’],
…
Continue reading “How To Integrate Perl, Ruby, and Python Programs”
Problem: You have a Python program that reads in a file named coolFile (in /tmp), and outputs the content to the screen. The program prints an extra blank line after each line of content of the file named coolFile. You want the output to not have an extra blank line. Here is the code:
#/usr/bin/python
x = open(“/tmp/coolFile”, “r”)
for line in x:
print (line)
How do you have the output now print an extra blank line after each line?
…
Docker is itself a dependency resolution tool. It is a container that allows a DevOps engineer to prepare one-time an OS environment with nuanced dependencies and configurations for other packages to be installed.
Leveraging the efficiency of a configuration management tool (such as Ansible, CFEngine, Chef, Puppet, and SaltStack) can empower DevOps engineering. It can also necessitate using duplicative deployments in different environments (development, quality assurance, staging, and production). Having a backup plan for disaster recovery is also important.
…
Continue reading “How Do You Copy Files into a Docker Container from the Server’s Command Line?”