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Build Plex on musl, from scratch

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Plex now provide a first-party musl Plex build that works without any
external dependencies whatsoever. It's built with LLVM with many
compiler and linker optimisations enabled:
https://forums.plex.tv/t/plex-media-server-forum-preview-faster-and-smaller-builds-with-new-toolchain/699575

Restructure build into multiple distinct Docker build stages to better
leverage caching and significantly improve build time on multicore
systems with BuildKit, particularly with LTO enabled.

Changes for this release include:
- Build `FROM spritsail/alpine` instead of `FROM debian` to ensure musl
  compatibility with all compiled binaries. Use `FROM scratch` for the
  resulting image. ld-musl is provided by Plex.
- Build busybox, su-exec and tini as they're no longer provided by the
  base image.
- Build binaries/libraries with standard hardening flags, including the
  popular -flto.

Signed-off-by: Joe Groocock <me@frebib.net>
This commit is contained in:
Joe Groocock
2021-05-28 11:12:19 +01:00
parent 48abfda1b6
commit f01f4950ab
4 changed files with 224 additions and 85 deletions
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README.md
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@ -13,14 +13,10 @@
[![Build Status](https://drone.spritsail.io/api/badges/spritsail/plex-media-server/status.svg)][drone]
[![Last Build](https://api.spritsail.io/badge/lastbuild/spritsail/plex-media-server:latest)][drone]
The _smallest*_ Plex Media Server docker image, built on barebones [spritsail/busybox](https://hub.docker.com/r/spritsail/busybox/) with glibc and libraries built from source. The container hosts a fully featured Plex Media Server, with almost all of the useless crap removed, resulting in the smallest container possible whilst maintaining full functionality.
You can find out more about the [spritsail/busybox](https://hub.docker.com/r/spritsail/busybox) base image [here](https://github.com/spritsail/busybox)
The _smallest*_ Plex Media Server docker image, built `FROM scratch` with musl provided by Plex and supporting libraries and binaries built from source. The container hosts a fully featured Plex Media Server, with almost all of the useless crap removed, resulting in the smallest container possible whilst maintaining full functionality.
_*last we checked_
**NOTICE:** This build has changed the `/config/Plex Media Server` mountpoint inside the container to now be present at `/config`. If you previously used this container, please update your mountpoint to `/config`.
## Getting Started
Navigate to [plex.tv/claim](https://www.plex.tv/claim) and obtain a token in the form `claim-xxxx...`