One of the ways to log in to a Docker container (requires root access)

Nsenter

The Nsenter tool is part of the Util-linux package since version 2.23. It provides access to the namespace of another process. Nsenter requires root privileges to work properly. Unfortunately, Util-linux is still at version 2.20 in Ubuntu 14.04. To install the latest version (2.24) Proceed as follows:

Cd/tmp Curl https://www.kernel.org/pub/linux/utils/util-linux/v2.24/util-linux-2.24.tar.gz | tar-zxf- CD util-linux-2.24 ./configure--without-ncurses make nsenter CP Nsenter/usr/local/bin

In order to connect to a container, you had to find out the PID of the first process in the container.

Docker Inspect--format "{{. State.pid}} "<container-id>

With this PID you can connect to the container:

Nsenter--target $PID--mount--uts--ipc--net--pid