Exposing Containers Externally

Run a container with a published port, then test and examine the published ports for the container.

docker run -d -p 8080:80 --name nginx_pub nginx
curl localhost:8080
docker port nginx_pub
docker ps

Create a service with a published port using the ingress publishing mode. Test the service and check which Swarm node the service’s task is running on.
```
docker service create -p 8081:80 --name nginx_ingress_pub nginx
curl localhost:8081
docker service ps nginx_ingress_pub
```
Create a service published using host mode. Check which node the task is running on and attempt to access it from the node where the task is running, as well as a node where it is not running.
```
docker service create -p mode=host,published=8082,target=80 --name nginx_host_pub nginx
docker service ps nginx_host_pub
```
Check which node the task is running on, and access the service from that node.
```
curl localhost:8082
```
Try accessing the service from another node. It should fail.
```
curl localhost:8082
```