Can you list and explain the main methods of application containerization?

The main methods of application containerization include:

1. Docker — the most popular tool for creating, distributing, and running containers. It allows packaging an application and all its dependencies into a single image.

2. Podman — an alternative to Docker that does not require a daemon and runs without root privileges.

3. Kubernetes — a container orchestration system that manages deployment, scaling, and maintenance of containerized applications.

4. LXC/LXD — lower-level containers that are closer to virtual machines, providing OS-level isolation.

5. Buildah — a tool for creating container images without the need to run a daemon.

Example of using Docker for containerizing a Go application:

FROM golang:1.20-alpine
WORKDIR /app
COPY . .
RUN go build -o myapp
CMD ["./myapp"]

Then with commands:

docker build -t myapp-image .
docker run myapp-image

You package the application and its dependencies into a container, ensuring portability and environment isolation.