How to set the current container or session in a Linux environment?

In a Linux environment, to identify the current container or session, several methods can be used:

1. Checking cgroup:

cat /proc/self/cgroup

The output can show container identifiers (e.g., Docker or Kubernetes) if the process is running inside a container.

2. Checking environment variables:

Some containers set specific environment variables, such as CONTAINER_ID.

3. Using container commands:

If you have access to Docker, you can find out the current container via:

docker ps --filter "id=$(hostname)"

4. Determining the session:

To identify the current session, you can use:

who am i

or

loginctl session-status

These commands will show information about the current user and session.

Thus, to identify a container — check cgroup or hostname; for a session — use system utilities like who or loginctl.