Which command demonstrates exposing port 8080 on the host to port 80 inside the container?

Which command demonstrates exposing port 8080 on the host to port 80 inside the container?

• A. sudo podman run -d --name apache1 -p 8080:80 rhscl/httpd-24-rhel7:2.4
• B. sudo podman run -d --name apache1 -p 80:8080 rhscl/httpd-24-rhel7:2.4
• C. sudo podman run -d --name apache1 -p 8080:8080 rhscl/httpd-24-rhel7:2.4
• D. sudo podman run -d --name apache1 -p 127.0.0.1:8081:80 rhscl/httpd-24-rhel7:2.4

Answer: (A)

Port mapping with the -p flag maps a host port to a container port using the format hostPort:containerPort. To expose host port 8080 to container port 80, you need -p 8080:80. The command shown uses -p 8080:80, runs in detached mode, assigns a name, and specifies the image, which together accomplish the exact mapping described. Other options either swap the ports (host 80 to container 8080), map the same port on both ends (8080:8080), or bind a specific localhost address and a different host port (127.0.0.1:8081:80), which do not meet the requirement of host 8080 to container 80.

Port mapping with the -p flag maps a host port to a container port using the format hostPort:containerPort. To expose host port 8080 to container port 80, you need -p 8080:80. The command shown uses -p 8080:80, runs in detached mode, assigns a name, and specifies the image, which together accomplish the exact mapping described. Other options either swap the ports (host 80 to container 8080), map the same port on both ends (8080:8080), or bind a specific localhost address and a different host port (127.0.0.1:8081:80), which do not meet the requirement of host 8080 to container 80.