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Docker run, docker exec and docker logs

(Pepipho) #1

When I do this:
docker run --name test -d busybox sh -c "while true; do $(echo date); sleep 1; done"
and then
docker logs
I get logs, but when I do first run and then docker exec:
docker run --name test -it busybox
docker exec -d test sh -c "while true; do $(echo date); sleep 1; done"
docker start test
docker logs -f test
I don’t get nothing.
Why this happens? What is solution for executing commands in running container and to get logs?

(Rdxmb) #2

Why this happens?

Because with -it you run a terminal inside the container with interactive , so STDOUT and STDERR are the terminal and not the logs.