- The first port(9000) : the Docker host (you can use this port to access to your container) to access to the container from the outside.
- the second port(8080) : is the port used by your application.
Example : I want to run tomcat server in a docker container, the default port of tomcat is 8080 and I want to expose my docker on port 9000 so I have to write :
docker run -p 9000:8080 --name myTomcatContainer tomcatSo with this configuration I can access to Tomcat from outside using : http://host-ip:9000
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