/proc/1/cgroups does not tell if I am inside of contianer

General
3

Thanks for hint.

I also check in this way, but not sure if it makes sense.
When I type on Host I see:

# df -h
Filesystem                                                                                                 Size  Used Avail Use% Mounted on
...
/var/lib/docker/fuse-overlayfs/eced1b7748e72cc17d33da7d7f5b3560508a8b5ad964028b277f436b82109145/merged

The same command in the contianer:

root@8d6a3b7407c5:/# df -h
Filesystem                                                                                                                                                                                                        Size  Used Avail Use% Mounted on
fuse-overlayfs                                                                                                                                                                                                    523G   27G  496G   6% /

I mean, I see only /

Can't create container