The value to the left of the arrow shows the host address where we can reach the container externally. Once again, in the PORTS column, we can find all the exposed ports. The task uses the hosts network which bypasses Dockers built-in virtual network by mapping container ports directly to the ENI of the Amazon EC2 instance that hosts the task. Getting the container host and mapped port. This is the default network mode on Linux if a network mode isnt specified in the task definition. Use '-net host' to add the Jenkins docker container on the hosts network stack. Use host machine public IP address to access webserver in Jenkins docker container. Docker Compose exposes all specified container ports, making them reachable internally and externally from the local machine.Īs before, let’s check the exposed ports with the docker ps command: > docker ps -aĮ8c65b9eec91. "6060:6060/udp" # container port (6060) restricted to UDP protocol, assigned to given host (6060)Īs presented above, we can also publish multiple container ports at once using different variants of the short syntax and configuring it more precisely. By default, Docker Compose sets up a dedicated network for the defined containers, enabling communication between them. "127.0.0.1:8002:8002" # container port (8002), assigned to given host port (8002) and bind to 127.0.0.1 Explore the differences between expose and ports when using Docker Compose. "8000:8000" # container port (8000), assigned to given host port (8000) 1 In production, host mode networking is recommended over bridge mode to avoid packet forwarding overhead. "3000" # container port (3000), assigned to random host port Now that we know the syntax, let’s define the ports in our Docker Compose file: services: PROTOCOL restricts container ports to the specified protocol or sets them to TCP if empty.
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