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Libcontainer: joining forces under one roof
Libcontainer is a project that aims to create a common library for container management across different technologies like Docker and LXC. It avoids external dependencies and supports multiple container types through a common API. The goal is to allow cooperation and code reuse across projects through a shared container management library. Libct is a companion C library that provides a frontend API for managing the entire container lifecycle.
Libcontainer: joining forces under one roof
- 1. Andrey Vagin <avagin@openvz.org> Libcontainer:joining forces under one roof Docker Moscow Meetup 2015
- 2. 2 Agenda ● History ● LinuxContainer ● Docker and LXC ● Libcontainer ● Libct ● Questions
- 3. 3 History ● Parallels VirtuozzoContainers ● Linux-VServer ● OpenVZ ● LXC ● Linux-utils (unshare, nsenter) ● SystemD (systemd-nspawn) ● Libcontainer (Docker) OpenVZ 2005 LXC 2008 Libcontainer 2014 Virtuozzo 2001 systemdLinux-utils 2009 VServer
- 4. 4 Linux Containers Namespace Cgroups ● Cgroupslimits resources – Cpu – Memory – Blkio – Freeze ● Namespaces isolates environment – MNT, PID, NET, IPC, USER, UTS
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- 6. 6 Libcontainer ● Avoid externaldependencies ● Create a library to joining forces – Docker, Google, Parallels, RedHat, etc ● Support other container technologies (OpenVZ, jails, zones) ● Reuse in other projects (not only in Go)
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- 8. 8 API ● Factory – Create(),Load() ● Process – Env, capabilities, cwd ● Container – Namespaces, cgroup – ID(), Start(), Destroy() – Pause()/Resume() – Stats(), Processes()
- 9. 9 Libct – Libct isa containers management library which provides convenient API for frontend programs to rule a container during its whole lifetime ● In C ● Bindings for other languages (Go, Python)
- 10. 10 Hierarchy Docker LXC execdriver Libcontainer Linux Libct Linux OpenVZ LinuxKernel OpenVZ Linux Kernel
- 11. 11 The current stateand future plans ● Implement the new API for Libcontainer (DONE) ● Migrate Docker to use the new API ● Integrate Libct into Libcontainer
- 12. 12 Q&A ● https://github.com/docker/libcontainer ● https://github.com/xemul/libct ●Andrey Vagin <avagin@openvz.org> Thank you