jiaguado/tcpdump repository overview

The Dockerfile is as below,

FROM ubuntu

RUN apt-get update && apt-get install -y tcpdump

RUN mkdir /var/lib/tcpdump

CMD tcpdump -i eth0

You just need the below command,

docker run --tty --net=container:{{CONTAINER_NAME}} -v /var/lib/tcpdump:/var/lib/tcpdump jiaguado/tcpdump:v1 tcpdump -A 'port 8080' -w /var/lib/tcpdump/capture.pcap

As you can see you can configure your tcpdump command as you please,

https://www.tcpdump.org/manpages/tcpdump.1.html⁠

in the sample above it will only connect traffic on 8080 and you will be able to gather the network capture on your host in /var/lib/tcpdump/