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# Create a network and start three app instances with the same alias docker network create lb-net for i in 1 2 3; do docker run -d \ --name app$i \ --network lb-net \ --network-alias app \ -e INSTANCE=$i \ myapp:latest done # Requests to "app:3000" round-robin across the three containers docker run --rm --network lb-net curlimages/curl \ sh -c 'for i in 1 2 3 4 5 6; do curl -s app:3000/instance; echo; done' # Inspect DNS — shows multiple A records docker run --rm --network lb-net alpine nslookup app # Custom hostname and extra hosts docker run -d \ --name myapi \ --network app-net \ --hostname api-server \ --add-host external.svc:1.2.3.4 \ myapp:latest docker exec myapi hostname docker exec myapi cat /etc/hosts # Clean up docker stop $(docker ps -q) docker network rm lb-net
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