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How do I assign a port mapping to an existing Docker container? iptables -t nat -I DOCKER 1 -p tcp --dport ${HOST_PORT} -j DNAT --to-destination ${CONTAINER_IP}:${CONTAINER_PORT} In this example HOST_PORT is 8050 and CONTAINER_PORT is 8000 To find CONTAINER_IP use docker inspect command To remove the iptables rule use this command: iptables -t nat -D DOCKER 1
Why do we need a port containerPort in a Kuberntes deployment container . . . Exposing a port here gives the system additional information about the network connections a container uses, but is primarily informational Not specifying a port here DOES NOT prevent that port from being exposed Any port which is listening on the default "0 0 0 0" address inside a container will be accessible from the network Cannot be updated
Difference between targetPort and port in Kubernetes Service definition Example: The actual application can run on port 8080 and health checks for this application can run on port 8089 of the container So if you hit the service without a port, it doesn't know to which port of the container it should redirect the request The service needs to have a mapping so that it can hit the specific port of the container
Exposing a port on a live Docker container - Stack Overflow To expose the container's port 8000 on your localhost's port 8001: iptables -t nat -A DOCKER -p tcp --dport 8001 -j DNAT --to-destination 172 17 0 19:8000 One way you can work this out is to setup another container with the port mapping you want, and compare the output of the iptables-save command (though, I had to remove some of the other
Connecting to Postgresql in a docker container from outside I tried to connect from localhost (mac) to a postgres container I changed the port in the docker-compose file from 5432 to 3306 and started the container No idea why I did it :| Then I tried to connect to postgres via PSequel and adminer and the connection could not be established After switching back to port 5432 all works fine
How to check what port a pod is listening on with kubectl and not . . . One answer suggested to run netstat inside the container This only works if netstat is part of the container's image As an alternative, you can run netstat on the host executing it in the container's network namespace Get the container's process ID on the host (this is the application running inside the container)
How to list exposed port of all containers? - Stack Overflow We have lots of containers started using Rancher with each container exposing multiple ports Since we started the containers with Rancher, no port is exposed to the host by default $ docker container ls shows no exposed ports for containers started by rancher Rancher CLI rancheris not installed
Docker: How to start an existing container and forward the ports? The left-hand port number is the docker host port - your computer - and the right-hand side is the docker container port You CAN modify the ports You can change the ports of a docker container without deleting it The way quin452 puts it - with minor revision: Get the container ID: docker ps -a Stop the container: docker stop [container name]