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Containerization

image of a fuzzy monster putting a program in a box

Containerization is the process of packaging software code along with the necessary operating system (OS) libraries and dependencies into a single lightweight executable called a container. These containers can run consistently on any infrastructure, whether it’s in the cloud or on-premises.

Key benefits of containerization include:

  1. Portability: Containers allow developers to create an application once and deploy it on multiple operating systems. They run efficiently across different environments without needing to rewrite the program code.
  2. Scalability: Containers are lightweight and can be easily scaled up or down. Developers can add multiple containers for different applications on a single machine.
  3. Fault Tolerance: Containerized microservices operate in isolated user spaces, so a single faulty container doesn’t affect others. This increases application resilience and availability.
  4. Agility: Troubleshooting and updating containerized applications doesn’t interfere with the underlying OS or other services, enabling faster software release cycles.

For more information relating to containers: https://www.ibm.com/topics/containerization

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Install Guest Editions on CentOS Linux

forest landscape with the silhouette of a person

Installing CentOS Linux in a virtual machine with VirtualBox is a straightforward exercise. The exception comes when configuring Guest Editions on the operating system. I find it easiest to use a group install with Yum, before “inserting” the disc for Guest Editions. Using the following two lines in the shell will ensure that the C compiler and kernel are available for installing Guest Editions.

sudo yum groups install 'Development Tools'
sudo yum install kernel-devel-yourLatestVersion

Further guidance is available in the user manual. https://www.virtualbox.org/manual/UserManual.html#externalkernelmodules