Building and Running an Nginx Docker Image on CentOS
This tutorial demonstrates how to create a Dockerfile on a CentOS host, build an Nginx image, run the container, and verify its operation, while highlighting the importance of specifying an entrypoint or CMD in the Dockerfile.
This guide walks through creating a Dockerfile on a CentOS node, building an Nginx image, and running it as a container.
First, create a working directory and open the Dockerfile for editing:
mkdir dockerfilecd dockerfile/Write the following Dockerfile content:
FROM centosMAINTAINER hahashenRUN yum -y install wgetRUN yum -y install nginxCOPY index.html /usr/share/nginx/html/EXPOSE 80ENTRYPOINT ["/usr/sbin/nginx","-g","daemon off;"]Build the image with: docker build -t="hahashen/nginx:v1" . After the build completes, verify the image list: docker images Run the container: docker run -d -p 80 --name dotnet hahashen/nginx:v1 Check running containers with: docker ps The output shows the container ID, image, command, status, and port mapping (e.g., 0.0.0.0:49154->80/tcp).
Note that the Dockerfile must include an ENTRYPOINT or CMD to keep the Nginx process alive.
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