Docker on CentOS 8

I have been working as a senior middleware engineer and DevOps engineer for the last 17 years, where I have used Docker on CentOS  in various multi-level, multi-cloud platforms like AWS  and Azure , and for Fortune 500 companies such as Charter, Mastercard, Cardinal Health, and Dell. Currently, I'm involved in the containerization of Spring  3.x, Java-based applications, and building microservices for distributed applications using Docker on CentOS . The containerization we are doing was initially using ECR, which has now migrated to EKS, and I am creating the CI/CD pipeline with GitLab , Docker  builds and Argo CD deployments. Our architecture includes an 80-plus pods cluster, scaling from 2 to 85, with a target of zero downtime and 140 TPS. Docker on CentOS, being lightweight and stable, integrates well with the Linux kernel, providing minimum overhead and cost efficiency, which is crucial for resource-constrained environments.

The capabilities of Docker on CentOS that I have found the most valuable include its use for Spring-based applications, which significantly enhance the value I derive from it. Docker on CentOS is particularly effective for building distributed applications and microservices. Deployments are smooth and easy, and the integration with Kubernetes  is seamless. I have successfully managed 80-plus pods clusters, scaling from 80 to 85 with 140 TPS without encountering any issues. Docker on CentOS's lightweight nature allows for flawless development across environments such as dev, stage, and prod.

From my perspective, the experience with the deployment of Docker on CentOS is quite positive, especially for the CI/CD pipeline. The architecture overview includes the use of a Git  repository and GitLab  CI, which facilitates the Docker  build for our Spring  3.x Java applications.

I have faced challenges with the end-of-life cycle of CentOS  since 2021-2022, security updates, network complexity with multi-node DNS issues, storage persistence pain points with EBS and EFS, and resource management before the Kubernetes  abstraction.

I have been working with Docker on CentOS for a very long time, starting with Docker Swarm and Docker, specifically for this current project itself.

While the end-of-life for CentOS  was noted, the overall persistence and network performance, including firewall functionality, were commendable. Earlier issues with out-of-memory crashes were resolved with proper sizing adjustments, and overall, I experienced no conflicts during updates, maintaining the 140 TPS targets effectively.

Regarding the scalability of Docker on CentOS, I initially built the Docker containers and moved them to Kubernetes, where my scaling efforts were focused.

Once Docker on CentOS is dockerized and deployed in Kubernetes, it scales effectively by meeting the target of 140 TPS with an SLA of one second for three REST endpoints.

I do not often communicate with the technical support of Docker on CentOS, as I haven't found the need; the documentation has been sufficient.

The documentation for Docker on CentOS is excellent; I find answers to my questions regarding the Docker daemon and network configuration issues quickly and efficiently. The information available for storage and security has been helpful, despite some challenges in those areas along with conducting DR exercises.

The steps I needed to take when setting the solution up involved starting with dockerizing the application on CentOS, primarily with versions 7/8. I pulled the Docker image after setting up CentOS and created user groups to prevent overwriting. Using the daemon setup, I configured the firewall and created the Docker file. My workflow continued with using Maven version 3.8 and integrating it with Eclipse to enhance several endpoints. This included updating PL/SQL procedures and aiming for an SLA of less than one second, with a multi-stage deployment reflecting the expanding functionality of our application.

From my perspective, the experience with the deployment of Docker on CentOS is quite positive, especially for the CI/CD pipeline. The installation is straightforward with easy updates and configurations, including starting Docker groups and handling the daemon without challenges. I utilized a JSON-based setup, firewall setups were simple, and the multi-stage deployments were effective. My integration efforts with Maven and Eclipse were also seamless, leading to a flawless push to ECR.

Docker on CentOS is utilized in a hybrid setup within my organization; starting on-premises with CentOS, our architecture evolved to the cloud. I began with building everything locally, then transitioned to development environments, eventually versioning the applications and pushing to ECR, allowing flexibility whether on local or cloud resources.

In terms of reliability and stability, I find Docker on CentOS to be dependable, with good kernel support and daemon stability. I would rate this solution an 8 out of 10.

My main use case for Docker on CentOS  is for microservices, and I have been using Docker  mainly for development and testing environments.

The most common use case for me with Docker on CentOS  is to spin up a SQL container, as it is much faster than installing and configuring the database, and it keeps the environment clean.

A typical scenario with Docker on CentOS is when I use a container locally for testing. I usually create a new MySQL  container for that.

I think that the container Docker on CentOS is the most beneficial because I am able to create a new container locally very easily.

I believe that the ease of container creation with Docker on CentOS helps my workflow, as it allows me to create testing environments locally.

It is especially useful when you need to test different database versions or reset the state quickly without affecting anything else on the system with Docker on CentOS.

Docker on CentOS has positively impacted my organization by being much faster than installing and configuring the database directly on the machine.

So far, I do not have problems with Docker on CentOS.

I have been working in my current field for 20 years.

I am satisfied with Docker on CentOS in this aspect.

I am able to create a database container with Docker on CentOS in minutes. If I want to create a testing environment, the time is approximately one day.

I recommend searching on the internet for the best practices for setting Docker on CentOS containers.

Docker on CentOS deserves a perfect score of 10 out of 10. It is more efficient nowadays than in the past, which makes Docker on CentOS deserve a perfect score for me. Docker on CentOS is easy to use. Regarding Docker on CentOS's AI capabilities, I think security is important. When using Docker on CentOS's AI capabilities, I find it very accurate and reliable. I would rate this review a 10.