toolbox is a small script that launches a container to let you bring in your favorite debugging or admin tools.
$ /usr/bin/toolbox
Spawning container core-fedora-latest on /var/lib/toolbox/core-fedora-latest.
Press ^] three times within 1s to kill container.
[root@localhost ~]# dnf -y install tcpdump
...
[root@localhost ~]# tcpdump -i ens3
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ens3, link-type EN10MB (Ethernet), capture size 65535 bytes
toolbox uses a Fedora-based userspace environment by default, but this can be changed to any Docker image. Simply override environment variables in $HOME/.toolboxrc:
core@core-01 ~ $ cat ~/.toolboxrc
TOOLBOX_DOCKER_IMAGE=ubuntu-debootstrap
TOOLBOX_DOCKER_TAG=14.04
core@core-01 ~ $ toolbox
Spawning container core-ubuntu-debootstrap-14.04 on /var/lib/toolbox/core-ubuntu-debootstrap-14.04.
Press ^] three times within 1s to kill container.
root@core-01:~# apt-get update && apt-get install tcpdump
Set an /etc/passwd entry for one of the users to /usr/bin/toolbox:
useradd bob -m -p '*' -s /usr/bin/toolbox -U -G sudo,docker,rktNow when SSHing into the system as that user, toolbox will automatically be started:
$ ssh [email protected]
Container Linux by CoreOS alpha (1284.0.0)
...
Spawning container bob-fedora-latest on /var/lib/toolbox/bob-fedora-latest.
Press ^] three times within 1s to kill container.
[root@localhost ~]# dnf -y install emacs-nox
...
[root@localhost ~]# emacs /media/root/etc/systemd/system/docker.service