instruction: Create a Dockerfile for networking
output: ```dockerfile
  from the service containers.You can separate this traffic by passing
  the --data-path-addr flag when initializing or joining the swarm. If there are
  multiple interfaces, --advertise-addr must be specified explicitly, and
  --data-path-addr defaults to --advertise-addr if not specified. Traffic about
  joining, leaving, and managing the swarm is sent over the
  --advertise-addr interface, and traffic among a service's containers is sent
  over the --data-path-addr interface. These flags can take an IP address or
  a network device name, such as eth0.This example initializes a swarm with a separate --data-path-addr. It assumes
  that your Docker host has two different network interfaces: 10.0.0.1 should be
  used for control and management traffic and 192.168.0.1 should be used for
  traffic relating to services.
  
  $ docker swarm init --advertise-addr 10.0.0.1 --data-path-addr 192.168.0.1
  This example joins the swarm managed by host 192.168.99.100:2377 and sets the
  --advertise-addr flag to eth0 and the --data-path-addr flag to eth1.
  
  $ docker swarm join \
   --token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2d7c \
   --advertise-addr eth0 \
   --data-path-addr eth1 \
   192.168.99.100:2377
  Publish ports on an overlay networkSwarm services connected to the same overlay network effectively expose all
  ports to each other. For a port to be accessible outside of the service, that
  port must be published using the -p or --publish flag on docker service create or docker service update. Both the legacy colon-separated syntax and
  the newer comma-separated value syntax are supported. The longer syntax is
  preferred because it is somewhat self-documenting.Flag valueDescription-p 8080:80 or-p published=8080,target=80Map TCP port 80 on the service to port 8080 on the routing mesh.-p 8080:80/udp or-p published=8080,target=80,protocol=udpMap UDP port 80 on the service to port 8080 on the routing mesh.-p 8080:80/tcp -p 8080:80/udp or-p published=8080,target=80,protocol=tcp -p published=8080,target=80,protocol=udpMap TCP port 80 on the service to TCP port 8080 on the routing mesh, and map UDP port 80 on the service to UDP port 8080 on the routing mesh.Learn moreDeploy services to a swarmSwarm administration guideSwarm mode tutorialNetworking overviewDocker CLI reference
  Request changesTable of contentsSwarm and types of trafficKey network conceptsFirewall considerationsOverlay networkingCreate an overlay networkCustomize an overlay networkAttach a service to an overlay networkConfigure service discoveryCustomize the ingress networkCustomize the docker_gwbridgeUse a separate interface for control and data trafficPublish ports on an overlay networkLearn more
  
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