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branch master updated: website: Add draft post about the Guix Build Coor
|
From: |
Christopher Baines |
|
Subject: |
branch master updated: website: Add draft post about the Guix Build Coordinator. |
|
Date: |
Fri, 23 Apr 2021 15:11:16 -0400 |
This is an automated email from the git hooks/post-receive script.
cbaines pushed a commit to branch master
in repository guix-artwork.
The following commit(s) were added to refs/heads/master by this push:
new 94c7a50 website: Add draft post about the Guix Build Coordinator.
94c7a50 is described below
commit 94c7a50a92acb36196fd00a917ecaaf1d82d4b3a
Author: Christopher Baines <mail@cbaines.net>
AuthorDate: Fri Apr 16 15:30:34 2021 +0100
website: Add draft post about the Guix Build Coordinator.
* website/posts/drafts/building-derivations-how-complicated-can-it-be.md:
New file.
* website/static/blog/img/build-coordinator-architecture.dia: New file.
* website/static/blog/img/build-coordinator-architecture.svg: New file.
---
...ilding-derivations-how-complicated-can-it-be.md | 238 ++++
.../blog/img/build-coordinator-architecture.dia | 1273 ++++++++++++++++++++
.../blog/img/build-coordinator-architecture.svg | 127 ++
3 files changed, 1638 insertions(+)
diff --git
a/website/posts/drafts/building-derivations-how-complicated-can-it-be.md
b/website/posts/drafts/building-derivations-how-complicated-can-it-be.md
new file mode 100644
index 0000000..8453c1d
--- /dev/null
+++ b/website/posts/drafts/building-derivations-how-complicated-can-it-be.md
@@ -0,0 +1,238 @@
+title: Building derivations, how complicated can it be?
+date: 2021-04-23 20:00
+author: Christopher Baines
+tags: Guix Build Coordinator, Continuous integration, Quality Assurance
+---
+
+[Derivations][derivations] are key to Guix, they're the low-level build
instructions
+used for things like packages, disk images, and most things than end
+up in the store.
+
+Around a year ago, the established approach to build derivations
+across multiple machines was [daemon offloading][offloading]. This
+offloading approach is mostly static in terms of the machines involved
+and uses SSH to communicate and move things between machines.
+
+[derivations]: https://guix.gnu.org/manual/en/html_node/Derivations.html
+[offloading]:
https://guix.gnu.org/manual/en/html_node/Daemon-Offload-Setup.html
+
+The Guix Build Coordinator project set out to provide an alternative
+approach, both to explore what's possible, but also to provide a
+usable tool to address two specific use cases.
+
+The first use case was building things (mostly packages) for the
+purpose of providing substitutes. At the time, the daemon offloading
+approach used on ci.guix.gnu.org which is the default source of
+substitutes. This approach was not scaling particularly well, so there
+was room for improvement.
+
+The second use case was more aspirational, support various quality
+assurance tasks, like building packages changed by patches, regularly
+testing fixed output derivations, or building the same derivations
+across different machines to test for hardware specific differences.
+
+While both these tasks have quite a lot in common, there's still quite
+a lot of differences, this in part led to a lot of flexibility in the
+design of the Guix Build Coordinator.
+
+# Architecture
+
+Like offloading, the Guix Build Coordinator works in a centralised
+manner. There's one coordinator process which manages state, and agent
+processes run on the machines that perform builds. The coordinator
+plans which builds to allocate to which agents, and agents ask the
+coordinator for builds, which they then attempt.
+
+Once agents complete a build, they send the log file and any outputs
+back to the coordinator. This is shown in the diagram below. Note that
+the Guix Build Coordinator doesn't actually take care of building the
+individual derivations, that's still left to `guix-daemon`'s on the
+machines involved.
+
+
+
+The builds to perform are worked through methodically, a build won't
+start unless all the inputs are available. This behaviour replicates
+what `guix-daemon` does, but across all the machines involved.
+
+If agents can't setup to perform a build, they report this back to the
+coordinator, which may then perform other builds to produce those
+required inputs.
+
+Currently HTTP is used when agents want to communicate to the
+coordinator, although additional approaches could be implemented in
+the future. Similarly, SQLite is used as the database, but from the
+start there has been a plan to support PostgreSQL, but that's yet to
+be implemented.
+
+# Comparison to offloading
+
+There's lots more to the internal workings of the Guix Build
+Coordinator, but how does this compare to the daemon offloading
+builds?
+
+Starting from the outside and working in, the API for the Guix Build
+Coordinator is all asynchronous. When you submit a build, you get an
+ID back, which you can use to track the progress of that build. This
+is in contrast to the way the daemon is used, where you keep a
+connection established while builds are progressing.
+
+Offloading is tightly integrated with the daemon, which can be both
+useful as offloading can transparently apply to anything that would
+otherwise be built locally. However, this can also be a limitation
+since the daemon is one of the harder components to modify.
+
+With offloading, `guix-daemon` reaches out to another machine, copies
+over all the inputs and the derivation, and then starts the
+build. Rather than doing this, the Guix Build Coordinator agent pulls
+in the inputs and derivation using substitutes.
+
+This pull approach has a few advantages, firstly it removes the need
+to keep a large store on the machine running the coordinator, and this
+large store requirement of using offloading became a problem in terms
+of scalability for the offloading approach. Another advantage is that
+it makes deploying agents easier, as they don't need to be reachable
+from the coordinator over the network, which can be an issue with NATs
+or virtual machines.
+
+When offloading builds, the outputs would be copied back to the store
+on build success. Instead, the Guix Build Coordinator agent sends the
+outputs back as nar files. The coordinator would then process these
+nar files to make substitutes available. This helps distribute the
+work in generating the nar files, which can be quite expensive.
+
+These differences may be subtle, but the architecture makes a big
+difference, it's much easier to store and serve nars at scale if this
+doesn't require a large store managed by a single guix-daemon.
+
+There's also quite a few things in common with the daemon offloading
+approach. Builds are still methodically performed across multiple
+machines, and load is taken in to account when starting new builds.
+
+# A basic example
+
+Getting the Guix Build Coordinator up and running does require some
+work, the following commands should get the coordinator and an agent
+running on a single machine. First, you start the coordinator.
+
+```sh
+ guix-build-coordinator
+```
+
+Then in another terminal, you interact with the running coordinator to
+create an agent in it's database.
+
+```sh
+ guix-build-coordinator agent new
+```
+
+Note the UUID of the generated agent.
+
+```sh
+ guix-build-coordinator agent <AGENT ID> password new
+```
+
+Note the generated password for the agent. With the UUID and password,
+the agent can then be started.
+
+```sh
+ guix-build-coordinator-agent --uuid=<AGENT ID> --password=<AGENT PASSWORD>
+```
+
+At this point, both processes should be running and the
+guix-build-coordinator should be logging requests from the agent.
+
+In a third terminal, also at the root of the repository, generate a
+derivation, and then instruct the coordinator to have it built.
+
+```sh
+ guix build --no-grafts -d hello
+```
+
+Note the derivation that is output.
+
+```sh
+ guix-build-coordinator build <DERIVATION FILE>
+```
+
+This will return a randomly generated UUID that represents the build.
+
+While running from the command line is useful for development and
+experimentation, there are [services in Guix for running the
+coordinator and agents][services].
+
+[services]:
https://guix.gnu.org/en/manual/en/html_node/Guix-Services.html#Guix-Build-Coordinator
+
+# Applications of the Guix Build Coordinator
+
+While I think the Guix Build Coordinator is a better choice than
+daemon offloading in some circumstances, it doesn't currently replace
+it.
+
+At a high level, the Guix Build Coordinator is useful where there's a
+need to build derivations and do something with the outputs or build
+results, more than just having the outputs in the local store. This
+could be serving substitutes, or testing derivations for example.
+
+At small scales, the additional complexity of the coordinator is
+probably unnecessary, but when it's useful to use multiple machines,
+either because of the resources that provides, or because of a more
+diverse range of hardware, then it makes much more sense to use the
+Guix Build Coordinator to coordinate what's going on.
+
+# Looking forward
+
+The Guix Build Coordinator isn't just an alternative to daemon
+offloading, it's more a general toolkit for coordinating the building
+of derivations.
+
+Much of the functionality in the Guix Build Coordinator happens in
+hooks. There are bits of code (hooks) that run when certain events
+happen, like a build gets submitted, or a build finished
+successfully. It's these hooks that are responsible for doing things
+like processing nars to be served as substitutes, or submitting
+retries for a failed build.
+
+This hook to automatically retry building particular derivations is
+particularly useful when trying to provide substitutes where you want
+to lessen the impact of random failures, or for quality assurance
+purposes, where you want more data to better identify problems.
+
+There are also more features such as build and agent tags and build
+priorities that can be really useful in some scenarios.
+
+My hope is that the Guix Build Coordinator will enable a better
+substitute experience for Guix users, as well as enabling a whole new
+range of quality assurance tasks. It's already possible to see some
+impact from the Guix Build Coordinator, but there's still much work to
+do!
+
+## Additional material
+
+ - [Guix Build Coordinator Git
repository](https://git.cbaines.net/guix/build-coordinator/)
+ - [2020/04/17 - Initial announcement - Prototype tool for building
derivations](https://lists.gnu.org/archive/html/guix-devel/2020-04/msg00323.html)
+ - [2020/09/19 - \[PATCH 0/4\] Add package and services for the Guix Build
Coordinator](https://issues.guix.gnu.org/43494)
+ - [2020/11/17 - Thoughts on building things for substitutes and the Guix
Build
Coordinator](https://lists.gnu.org/archive/html/guix-devel/2020-11/msg00417.html)
+ - [2020/11/22 - Guix Days 2020 - Progress so far on the Guix Build
Coordinator](https://xana.lepiller.eu/guix-days-2020/guix-days-2020-christopher-baines-guix-build-coordinator.mp4)
+ - [2021/02/09 - The Guix Build Coordinator in
2021](https://lists.gnu.org/archive/html/guix-devel/2021-02/msg00148.html)
+ - [2021/02/14 - Getting the Guix Build Coordinator agent working on the
Hurd](https://lists.gnu.org/archive/html/guix-devel/2021-02/msg00223.html)
+ - [2021/03/08 - Hurd substitute availability (27.5%) and next
steps?](https://lists.gnu.org/archive/html/guix-devel/2021-03/msg00074.html)
+
+#### About GNU Guix
+
+[GNU Guix](https://www.gnu.org/software/guix) is a transactional package
+manager and an advanced distribution of the GNU system that [respects
+user
+freedom](https://www.gnu.org/distros/free-system-distribution-guidelines.html).
+Guix can be used on top of any system running the Hurd or the Linux
+kernel, or it can be used as a standalone operating system distribution
+for i686, x86_64, ARMv7, and AArch64 machines.
+
+In addition to standard package management features, Guix supports
+transactional upgrades and roll-backs, unprivileged package management,
+per-user profiles, and garbage collection. When used as a standalone
+GNU/Linux distribution, Guix offers a declarative, stateless approach to
+operating system configuration management. Guix is highly customizable
+and hackable through [Guile](https://www.gnu.org/software/guile)
+programming interfaces and extensions to the
+[Scheme](http://schemers.org) language.
diff --git a/website/static/blog/img/build-coordinator-architecture.dia
b/website/static/blog/img/build-coordinator-architecture.dia
new file mode 100644
index 0000000..492be1b
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+ <dia:attribute name="elem_height">
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+ <dia:attribute name="stereotype">
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+ <dia:attribute name="exstate">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="attrib">
+ <dia:composite type="text">
+ <dia:attribute name="string">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="height">
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+ <dia:attribute name="color">
+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="alignment">
+ <dia:enum val="0"/>
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+ <dia:color val="#000000ff"/>
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+ <dia:attribute name="text">
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+ <dia:string>#agent#</dia:string>
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+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:composite type="text">
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+ <dia:attribute name="font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="height">
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+ <dia:attribute name="color">
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+ <dia:color val="#000000ff"/>
+ </dia:attribute>
+ <dia:attribute name="text">
+ <dia:composite type="text">
+ <dia:attribute name="string">
+ <dia:string>#guix-daemon#</dia:string>
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+ <dia:attribute name="font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="height">
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+ <dia:color val="#000000ff"/>
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+ <dia:color val="#ffffffff"/>
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+ <dia:attribute name="obj_pos">
+ <dia:point val="20.8518,1.95278"/>
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+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="20.4518,1.92778;21.2518,11.8463"/>
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+ <dia:composite type="dict"/>
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+ <dia:int val="1"/>
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+ <dia:int val="1"/>
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+ <dia:attribute name="cpl_southeast">
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+ <dia:object type="UML - Message" version="0" id="O8">
+ <dia:attribute name="obj_pos">
+ <dia:point val="11.8372,6.33941"/>
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+ <dia:attribute name="obj_bb">
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+ <dia:attribute name="text">
+ <dia:string>#substitute derivation#</dia:string>
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+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="line_colour">
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+ <dia:point val="11.8372,8.33941"/>
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+ <dia:attribute name="text">
+ <dia:string>#(finished)#</dia:string>
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+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:point val="20.8589,9.1496"/>
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+ <dia:int val="1"/>
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+ <dia:object type="UML - Message" version="0" id="O11">
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+ <dia:point val="11.8372,10.3394"/>
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+ <dia:attribute name="text">
+ <dia:string>#substitute inputs#</dia:string>
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+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:string>#submit log file#</dia:string>
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+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="conn_endpoints">
+ <dia:point val="11.1372,20.8394"/>
+ <dia:point val="2.77916,20.8853"/>
+ </dia:attribute>
+ <dia:attribute name="text">
+ <dia:string>#submit output(s)#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="text_font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
+ </dia:attribute>
+ <dia:attribute name="text_height">
+ <dia:real val="0.63499999312083333"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000ff"/>
+ </dia:attribute>
+ <dia:attribute name="text_pos">
+ <dia:point val="6.9582,21.3624"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000ff"/>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O1" connection="38"/>
+ <dia:connection handle="1" to="O21" connection="3"/>
+ </dia:connections>
+ </dia:object>
+ <dia:object type="UML - Message" version="0" id="O18">
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+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="2.7304,23.4616;11.2447,24.5099"/>
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+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
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+ <dia:attribute name="conn_endpoints">
+ <dia:point val="11.1945,23.8311"/>
+ <dia:point val="2.78186,23.8618"/>
+ </dia:attribute>
+ <dia:attribute name="text">
+ <dia:string>#report build result#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="text_font">
+ <dia:font family="sans" style="0" name="Helvetica"/>
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+ <dia:attribute name="text_height">
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+ <dia:attribute name="text_colour">
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+ <dia:attribute name="line_colour">
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+ <dia:rectangle val="2.03929,6.23687;2.83929,17.5394"/>
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+ <dia:attribute name="meta">
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+ <dia:attribute name="conn_endpoints">
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+ <dia:attribute name="rbot">
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+ </dia:attribute>
+ <dia:attribute name="draw_focus">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="draw_cross">
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+ </dia:attribute>
+ <dia:attribute name="cpl_northwest">
+ <dia:int val="1"/>
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+ <dia:attribute name="cpl_southwest">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_northeast">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_southeast">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O0" connection="6"/>
+ </dia:connections>
+ </dia:object>
+ <dia:object type="UML - Lifeline" version="0" id="O20">
+ <dia:attribute name="obj_pos">
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+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="2.03398,16.4151;2.83398,20.0448"/>
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+ <dia:attribute name="meta">
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+ <dia:attribute name="draw_focus">
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+ <dia:attribute name="cpl_northwest">
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+ <dia:attribute name="cpl_northeast">
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+ <dia:attribute name="cpl_southeast">
+ <dia:int val="1"/>
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+ </dia:object>
+ <dia:object type="UML - Lifeline" version="0" id="O21">
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+ <dia:attribute name="obj_bb">
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+ <dia:attribute name="meta">
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+ <dia:attribute name="rbot">
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+ <dia:attribute name="draw_focus">
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+ <dia:object type="UML - Lifeline" version="0" id="O22">
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+ <dia:attribute name="obj_bb">
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+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
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+ <dia:attribute name="conn_endpoints">
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+ <dia:attribute name="line_colour">
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+ <dia:attribute name="fill_colour">
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+ <dia:attribute name="rtop">
+ <dia:real val="0.5"/>
+ </dia:attribute>
+ <dia:attribute name="rbot">
+ <dia:real val="2.5"/>
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+ <dia:attribute name="draw_focus">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="draw_cross">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_northwest">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_southwest">
+ <dia:int val="1"/>
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+ <dia:attribute name="cpl_northeast">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:attribute name="cpl_southeast">
+ <dia:int val="1"/>
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+ </dia:object>
+ </dia:layer>
+</dia:diagram>
diff --git a/website/static/blog/img/build-coordinator-architecture.svg
b/website/static/blog/img/build-coordinator-architecture.svg
new file mode 100644
index 0000000..b14bb15
--- /dev/null
+++ b/website/static/blog/img/build-coordinator-architecture.svg
@@ -0,0 +1,127 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN"
"http://www.w3.org/TR/2001/PR-SVG-20010719/DTD/svg10.dtd";>
+<svg width="24cm" height="27cm" viewBox="1 1 470 526"
xmlns="http://www.w3.org/2000/svg"; xmlns:xlink="http://www.w3.org/1999/xlink";>
+ <g id="Background">
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+ <line style="fill: none; stroke-opacity: 1; stroke-width: 1;
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+ </g>
+ <g>
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x="139.265" y="136.013">(new build details)</text>
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+ <g>
+ <rect style="fill: #ffffff; fill-opacity: 1; stroke-opacity: 1;
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+ <tspan x="229.745" y="25.4549">agent</tspan>
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+ <text font-size="12.7998" style="fill: #000000; fill-opacity: 1; stroke:
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height="40"/>
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x="323.39" y="136.624">substitute derivation</text>
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+ <polygon style="fill: #000000; fill-opacity: 1; stroke-opacity: 1;
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