libpod is meant to provide an library for applications lookint the user the Container Pod concept popularized by Kubernetes. libpod also contains a tool kpod, which allows you to manage Pods, Containers, and Container Images.
At a high level, we expect the scope of libpod/kpod to the following functionalities:
- Support multiple image formats including the existing Docker image format
- Support for multiple means to download images including trust & image verification
- Container image management (managing image layers, overlay filesystems, etc)
- Container and POD process lifecycle management
- Resource isolation of containers and PODS.
- Building container images. See Buildah
- Signing and pushing images to various image storages. See Skopeo.
- Container Runtimes daemons for working with Kubernetes CRIs See CRI-O.
The plan is to use OCI projects and best of breed libraries for different aspects:
- Runtime: runc (or any OCI runtime-spec implementation) and oci runtime tools
- Images: Image management using containers/image
- Storage: Storage and management of image layers using containers/storage
- Networking: Networking support through use of CNI
libpod is currently in active development.
| Command | Description | Demo |
|---|---|---|
| kpod(1) | Simple management tool for pods and images | |
| kpod-attach(1) | Instead of providing a kpod attach command, the man page kpod-attach describes how to use the kpod logs and kpod exec commands to achieve the same goals as kpod attach. |
|
| kpod-cp(1) | Instead of providing a kpod cp command, the man page kpod-cp describes how to use the kpod mount command to have even more flexibility and functionality. |
|
| kpod-diff(1) | Inspect changes on a container or image's filesystem |  |
| kpod-export(1) | Export container's filesystem contents as a tar archive | |
| kpod-history(1) | Shows the history of an image | |
| kpod-images(1) | List images in local storage | |
| kpod-info(1) | Display system information | |
| kpod-inspect(1) | Display the configuration of a container or image | |
| kpod-kill(1) | Kill the main process in one or more running containers | |
| kpod-load(1) | Load an image from docker archive or oci | |
| kpod-login(1) | Login to a container registry | |
| kpod-logout(1) | Logout of a container registry | |
| kpod-logs(1) | Display the logs of a container | |
| kpod-mount(1) | Mount a working container's root filesystem | |
| kpod-pause(1) | Pause one or more running containers | |
| kpod-ps(1) | Prints out information about containers | |
| kpod-pull(1) | Pull an image from a registry | |
| kpod-push(1) | Push an image to a specified destination | |
| kpod-rename(1) | Rename a container | |
| kpod-rm(1) | Removes one or more containers | |
| kpod-rmi(1) | Removes one or more images | |
| kpod-save(1) | Saves an image to an archive | |
| kpod-stats(1) | Display a live stream of one or more containers' resource usage statistics | |
| kpod-stop(1) | Stops one or more running containers | |
| kpod-tag(1) | Add an additional name to a local image | |
| kpod-umount(1) | Unmount a working container's root filesystem | |
| kpod-unpause(1) | Unpause one or more running containers | |
| kpod-version(1) | Display the version information | |
| kpod-wait(1) | Wait on one or more containers to stop and print their exit codes |
KPOD configures OCI Hooks to run when launching a container
Useful information for ops and dev transfer as it relates to infrastructure that utilizes KPOD
For async communication and long running discussions please use issues and pull requests on the github repo. This will be the best place to discuss design and implementation.
For sync communication we have an IRC channel #KPOD, on chat.freenode.net, that everyone is welcome to join and chat about development.
Latest version of runc is expected to be installed on the system. It is picked up as the default runtime by kpod.
Required
Fedora, CentOS, RHEL, and related distributions:
yum install -y \
btrfs-progs-devel \
device-mapper-devel \
git \
glib2-devel \
glibc-devel \
glibc-static \
go \
golang-github-cpuguy83-go-md2man \
gpgme-devel \
libassuan-devel \
libgpg-error-devel \
libseccomp-devel \
libselinux-devel \
ostree-devel \
pkgconfig \
runc \
skopeo-containersDebian, Ubuntu, and related distributions:
apt-get install -y \
btrfs-tools \
git \
golang-go \
libassuan-dev \
libdevmapper-dev \
libglib2.0-dev \
libc6-dev \
libgpgme11-dev \
libgpg-error-dev \
libseccomp-dev \
libselinux1-dev \
pkg-config \
runc \
skopeo-containersDebian, Ubuntu, and related distributions will also need a copy of the development libraries for ostree, either in the form of the libostree-dev package from the flatpak PPA, or built from source (more on that here).
If using an older release or a long-term support release, be careful to double-check that the version of runc is new enough (running runc --version should produce spec: 1.0.0), or else build your own.
NOTE
Be careful to double-check that the version of golang is new enough, version 1.8.x or higher is required. If needed, golang kits are avaliable at https://golang.org/dl/
Optional
Fedora, CentOS, RHEL, and related distributions:
(no optional packages)
Debian, Ubuntu, and related distributions:
apt-get install -y \
libapparmor-devAs with other Go projects, KPOD must be cloned into a directory structure like:
GOPATH
└── src
└── github.com
└── projectatomic
└── libpod
First, configure a GOPATH (if you are using go1.8 or later, this defaults to ~/go).
export GOPATH=~/go
mkdir -p $GOPATHNext, clone the source code using:
mkdir -p $GOPATH/src/github.com/projectatomic
cd $_ # or cd $GOPATH/src/github.com/projectatomic
git clone https://github.com/projectatomic/libpod # or your fork
cd libpodmake install.tools
make
sudo make installOtherwise, if you do not want to build kpod with seccomp support you can add BUILDTAGS="" when running make.
make BUILDTAGS=""
sudo make installkpod supports optional build tags for compiling support of various features.
To add build tags to the make option the BUILDTAGS variable must be set.
make BUILDTAGS='seccomp apparmor'| Build Tag | Feature | Dependency |
|---|---|---|
| seccomp | syscall filtering | libseccomp |
| selinux | selinux process and mount labeling | libselinux |
| apparmor | apparmor profile support | libapparmor |
Follow this tutorial to get started with KPOD.
A proper description of setting up CNI networking is given in the
contrib/cni README. But the gist is that you need to
have some basic network configurations enabled and CNI plugins installed on
your system.
- Basic pod/container lifecycle, basic image pull (done)
- Support for tty handling and state management (done)
- Basic integration with kubelet once client side changes are ready (done)
- Support for log management, networking integration using CNI, pluggable image/storage management (done)
- Support for exec/attach (done)