| commit | 754b6eb67ae49f32f99919f1b37d0e2725fdd783 | [log] [tgz] |
|---|---|---|
| author | Micah Abbott <miabbott@redhat.com> | Thu Mar 31 19:34:00 2022 |
| committer | Micah Abbott <miabbott@redhat.com> | Fri Apr 08 16:07:05 2022 |
| tree | be68249761eaba5ade0bb5ce178b1dde99e90c42 | |
| parent | af7bf05d0c700854059e9a7d1f43238e63efc6e6 [diff] |
remove existing containers when doing image pull In the case where there is a new container image available or if someone switches the container image they are using, there may be an existing container created on disk. In this case, we should remove the existing container, so the user enters a freshly created container from the new container image.
toolbox is a small script that launches a container to let you bring in your favorite debugging or admin tools.
There are currently two scripts that live within this repository:
$ /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
core@core-01 ~ $ cat ~/.toolboxrc REGISTRY=registry.redhat.io IMAGE=rhel7/rhel-tools:latest core@core-01 ~ $ toolbox Spawning a container 'toolbox-test' with image 'registry.redhat.io/rhel7/rhel-tools:latest'
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,rkt
Now when SSHing into the system as that user, toolbox will automatically be started:
$ ssh bob@hostname.example.com 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