Finding a string in docker logs of container

What is the best way to find a specific string in the logs of a docker container? Let's say I want to see all requests, that are made in the "nginx" docker image that came from a ip starting with "127."

grep wont work as expected on docker logs command:

docker logs nginx | grep "127."

It prints all logs, but does not filter the result!

this can happen if the container is logging to stderr, piping works only for stdout, so try:

docker logs nginx 2>&1 | grep "127."

"2>&1" will tells the shell to redirect stderr to stdout and give the output to grep using pipe.

As vim fan I prefer to use less and search with /

docker logs nginx 2>&1 | less

docker logs <container_name> 2>&1 | grep <string>