Docker on Oracle Linux 10

My main use case for Docker on CentOS  is running containers for different application webs. For example, I run a Moodle  or different APIs and microservices that are developed in Docker on CentOS .

Before Docker  was very complicated. Doing the testing with the developer, and with Docker  it is very fast to deploy the different changes.

I find working with APIs and microservices in Docker on CentOS to be very useful and very practical. Docker is fast, lightweight, and makes apps run the same everywhere without problems.

On CentOS , Docker provides the same core features as other Linux systems, which is not very special, but I can run containers, manage images, store data, and deploy apps.

I mainly rely on container images and volumes every day in Docker on CentOS, plus networking when apps need to connect. For example, volumes are essential when I need to keep data persistent, like databases or logs.

Docker on CentOS has positively impacted my organization by helping us deploy faster, avoid environment problems, and make the system more reliable and easier to manage.

With Docker deploying faster, we save approximately 30% of the time on production issues or in the pipelines, which are specific outcomes I have observed.

Docker on CentOS can be improved with better security, easier storage management, and smoother integration with CI/CD and orchestration tools.

I think better monitoring, easier debugging, and more standard behavior across environments will make Docker on CentOS even better.

Other improvements needed for Docker on CentOS include improving compatibility, security scanning, easier default setup, and clear enterprise documentation, for example.

I have been using Docker on CentOS for about four years.

Docker on CentOS is stable.

Docker on CentOS has super scalability with Kubernetes , but it also has scalability without Kubernetes .

I previously tried containers on Ubuntu , but I quickly changed to Docker on CentOS.

I have only seen a return on investment in terms of time saved because I save my time, but in economic terms, no, because it was free.

My experience with pricing, setup cost, and licensing for Docker on CentOS is that it is free. The licensing is free, so it is very good.

Before choosing Docker on CentOS, I evaluated other options such as Docker on Ubuntu  or virtual machines.

My advice for others looking into using Docker on CentOS is to start simple, use trusted images, which is very important, learn networking and volumes, and focus on security and monitoring. I would rate this product a 7.

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.