Tiny howto, so don’t need to look this up as often. In order to tcpdump your own docker traffic, you will need to identify the appropriate interface first:
1 2 3 4 | # docker network lsNETWORK ID NAME DRIVER SCOPE15a300de bridge bridge local88d8d7d1 nextcloud_default bridge local |
From that, we get the network ID. This will be included (at least partly) in the interface name, so we’ll just take the first few characters and grep:
1 2 | # ip addr | grep 88d8b9: br-88d8d7d1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default |
this gives us the full interface name (ok, basically this is just “br-” followed by the network ID).
We can then just use tcpdump any way we like:
1 | tcpdump -i br-88d8d7d1 |
