Using drones to understand Kubernetes concepts

IBM, updated 🕥 2022-12-10 07:15:09

Kubefly - Understanding Kubernetes using Drones

Kubernetes is one of the fastest-growing technologies in the industry, and for good reason. Kubernetes provides an isolated and secure app platform for managing containers - ultimately transforming application development and operations for your team or company. You may have heard, or felt, that Kubernetes is complex or hard to learn. 

Kubefly was born out of a simple idea, explain the concepts of Kubernetes, Istio and cloud native technologies in a fun and visual way. We wanted to help people understand what was going on behind the scenes.

The question was how to visualize the concepts?

The answer was Drones!!

Our team at IBM recently built a demo to teach and demonstrate core Kubernetes concepts using a swarm of flying drones. The drones showcase concepts like pods, replica sets, deployments, and stateful sets.  Once you apply your Kubernetes Deployment describing an application, you'll see a few drones take off -- each one representing a pod in the deployment. If one of the kubernetes pods is killed, you'll see the drone land, and another will take its place, as Kubernetes' declarative model will always attempt to match the desired state.

If you would like to learn a little more, or see a video of the drones in action, check out our blog.

This project will share the demo code we built and the equipment that we used.

The Gear

To build the demo we used drones from Bitcraze.io. The drones are Crazyflie 2.0 drones. Crazyflie

These are open source drones that have a rich API and easy to use programming libraries. And the really cool part is that they are extensible with a set of add-on decks. For our demo we used the LED Ring Deck to provide the lights on the bottom of the drones.

LED Ring Deck

To position the drones, we used the Loco Positioning System. LPS is essentially indoor GPS, allowing the drones to fly autonomously. LPS also provides an API to tell the drones an exact coordinate we want them to fly to. LPS.

In our case we actually bought the Swarm Bundle, which provided 10 drones, the Loco Positioning System, and all the parts we needed.

If you want to start small, you can play with a single Crazyflie drone and the Flow Deck. This will allow you to do similar things without the complexity of the full LPS.

The Software

Kubefly is made up of two key components, the Drone Controller and the Kubernetes Watcher.

Drone Controller

The Drone controller, in the drone-controller folder, is a python program that runs on your laptop and connects via radio link directly to the drones. Drone controller will call the kube-watcher API to receive data about where the drones should be positioned, and then will send commands to the drones based on that data.

Kubernetes Watcher

The Kubernetes Watcher, in the kube-watcher folder, is a Node.js program that runs locally, on your laptop. It uses the Kubernetes API to connect to a Kubernetes cluster and watches for events such as Pods starting and stopping. Kube-watcher then translates those events into positions for the drones sent to the drone connection. In our case we ran Kubernetes on IBM Cloud using IBM Cloud Kubernetes Service (IKS).

MyApp

MyApp, in the myapp folder, is a simple demo application you can run on Kubernetes to test things out.

Issues

Bump qs and express in /myapp

opened on 2022-12-10 07:15:04 by dependabot[bot]

Bumps qs to 6.11.0 and updates ancestor dependency express. These dependencies need to be updated together.

Updates qs from 6.5.2 to 6.11.0

Changelog

Sourced from qs's changelog.

6.11.0

  • [New] [Fix] stringify: revert 0e903c0; add commaRoundTrip option (#442)
  • [readme] fix version badge

6.10.5

  • [Fix] stringify: with arrayFormat: comma, properly include an explicit [] on a single-item array (#434)

6.10.4

  • [Fix] stringify: with arrayFormat: comma, include an explicit [] on a single-item array (#441)
  • [meta] use npmignore to autogenerate an npmignore file
  • [Dev Deps] update eslint, @ljharb/eslint-config, aud, has-symbol, object-inspect, tape

6.10.3

  • [Fix] parse: ignore __proto__ keys (#428)
  • [Robustness] stringify: avoid relying on a global undefined (#427)
  • [actions] reuse common workflows
  • [Dev Deps] update eslint, @ljharb/eslint-config, object-inspect, tape

6.10.2

  • [Fix] stringify: actually fix cyclic references (#426)
  • [Fix] stringify: avoid encoding arrayformat comma when encodeValuesOnly = true (#424)
  • [readme] remove travis badge; add github actions/codecov badges; update URLs
  • [Docs] add note and links for coercing primitive values (#408)
  • [actions] update codecov uploader
  • [actions] update workflows
  • [Tests] clean up stringify tests slightly
  • [Dev Deps] update eslint, @ljharb/eslint-config, aud, object-inspect, safe-publish-latest, tape

6.10.1

  • [Fix] stringify: avoid exception on repeated object values (#402)

6.10.0

  • [New] stringify: throw on cycles, instead of an infinite loop (#395, #394, #393)
  • [New] parse: add allowSparse option for collapsing arrays with missing indices (#312)
  • [meta] fix README.md (#399)
  • [meta] only run npm run dist in publish, not install
  • [Dev Deps] update eslint, @ljharb/eslint-config, aud, has-symbols, tape
  • [Tests] fix tests on node v0.6
  • [Tests] use ljharb/actions/node/install instead of ljharb/actions/node/run
  • [Tests] Revert "[meta] ignore eclint transitive audit warning"

6.9.7

  • [Fix] parse: ignore __proto__ keys (#428)
  • [Fix] stringify: avoid encoding arrayformat comma when encodeValuesOnly = true (#424)
  • [Robustness] stringify: avoid relying on a global undefined (#427)
  • [readme] remove travis badge; add github actions/codecov badges; update URLs
  • [Docs] add note and links for coercing primitive values (#408)
  • [Tests] clean up stringify tests slightly
  • [meta] fix README.md (#399)
  • Revert "[meta] ignore eclint transitive audit warning"

... (truncated)

Commits
  • 56763c1 v6.11.0
  • ddd3e29 [readme] fix version badge
  • c313472 [New] [Fix] stringify: revert 0e903c0; add commaRoundTrip option
  • 95bc018 v6.10.5
  • 0e903c0 [Fix] stringify: with arrayFormat: comma, properly include an explicit `[...
  • ba9703c v6.10.4
  • 4e44019 [Fix] stringify: with arrayFormat: comma, include an explicit [] on a s...
  • 113b990 [Dev Deps] update object-inspect
  • c77f38f [Dev Deps] update eslint, @ljharb/eslint-config, aud, has-symbol, tape
  • 2cf45b2 [meta] use npmignore to autogenerate an npmignore file
  • Additional commits viewable in compare view


Updates express from 4.16.4 to 4.18.2

Release notes

Sourced from express's releases.

4.18.2

4.18.1

  • Fix hanging on large stack of sync routes

4.18.0

... (truncated)

Changelog

Sourced from express's changelog.

4.18.2 / 2022-10-08

4.18.1 / 2022-04-29

  • Fix hanging on large stack of sync routes

4.18.0 / 2022-04-25

... (truncated)

Commits


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Bump express from 4.16.4 to 4.17.3 in /kube-watcher

opened on 2022-12-09 12:23:05 by dependabot[bot]

Bumps express from 4.16.4 to 4.17.3.

Release notes

Sourced from express's releases.

4.17.3

4.17.2

4.17.1

  • Revert "Improve error message for null/undefined to res.status"

4.17.0

  • Add express.raw to parse bodies into Buffer
  • Add express.text to parse bodies into string

... (truncated)

Changelog

Sourced from express's changelog.

4.17.3 / 2022-02-16

4.17.2 / 2021-12-16

4.17.1 / 2019-05-25

... (truncated)

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Bump qs and express in /kube-watcher

opened on 2022-12-08 12:39:27 by dependabot[bot]

Bumps qs to 6.5.3 and updates ancestor dependency express. These dependencies need to be updated together.

Updates qs from 6.5.2 to 6.5.3

Changelog

Sourced from qs's changelog.

6.5.3

  • [Fix] parse: ignore __proto__ keys (#428)
  • [Fix] utils.merge: avoid a crash with a null target and a truthy non-array source
  • [Fix] correctly parse nested arrays
  • [Fix] stringify: fix a crash with strictNullHandling and a custom filter/serializeDate (#279)
  • [Fix] utils: merge: fix crash when source is a truthy primitive & no options are provided
  • [Fix] when parseArrays is false, properly handle keys ending in []
  • [Fix] fix for an impossible situation: when the formatter is called with a non-string value
  • [Fix] utils.merge: avoid a crash with a null target and an array source
  • [Refactor] utils: reduce observable [[Get]]s
  • [Refactor] use cached Array.isArray
  • [Refactor] stringify: Avoid arr = arr.concat(...), push to the existing instance (#269)
  • [Refactor] parse: only need to reassign the var once
  • [Robustness] stringify: avoid relying on a global undefined (#427)
  • [readme] remove travis badge; add github actions/codecov badges; update URLs
  • [Docs] Clean up license text so it’s properly detected as BSD-3-Clause
  • [Docs] Clarify the need for "arrayLimit" option
  • [meta] fix README.md (#399)
  • [meta] add FUNDING.yml
  • [actions] backport actions from main
  • [Tests] always use String(x) over x.toString()
  • [Tests] remove nonexistent tape option
  • [Dev Deps] backport from main
Commits
  • 298bfa5 v6.5.3
  • ed0f5dc [Fix] parse: ignore __proto__ keys (#428)
  • 691e739 [Robustness] stringify: avoid relying on a global undefined (#427)
  • 1072d57 [readme] remove travis badge; add github actions/codecov badges; update URLs
  • 12ac1c4 [meta] fix README.md (#399)
  • 0338716 [actions] backport actions from main
  • 5639c20 Clean up license text so it’s properly detected as BSD-3-Clause
  • 51b8a0b add FUNDING.yml
  • 45f6759 [Fix] fix for an impossible situation: when the formatter is called with a no...
  • f814a7f [Dev Deps] backport from main
  • Additional commits viewable in compare view


Updates express from 4.16.4 to 4.18.2

Release notes

Sourced from express's releases.

4.18.2

4.18.1

  • Fix hanging on large stack of sync routes

4.18.0

... (truncated)

Changelog

Sourced from express's changelog.

4.18.2 / 2022-10-08

4.18.1 / 2022-04-29

  • Fix hanging on large stack of sync routes

4.18.0 / 2022-04-25

... (truncated)

Commits


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Bump certifi from 2019.9.11 to 2022.12.7 in /drone-controller

opened on 2022-12-08 06:34:51 by dependabot[bot]

Bumps certifi from 2019.9.11 to 2022.12.7.

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Bump decode-uri-component from 0.2.0 to 0.2.2 in /kube-watcher

opened on 2022-12-02 22:27:06 by dependabot[bot]

Bumps decode-uri-component from 0.2.0 to 0.2.2.

Release notes

Sourced from decode-uri-component's releases.

v0.2.2

  • Prevent overwriting previously decoded tokens 980e0bf

https://github.com/SamVerschueren/decode-uri-component/compare/v0.2.1...v0.2.2

v0.2.1

  • Switch to GitHub workflows 76abc93
  • Fix issue where decode throws - fixes #6 746ca5d
  • Update license (#1) 486d7e2
  • Tidelift tasks a650457
  • Meta tweaks 66e1c28

https://github.com/SamVerschueren/decode-uri-component/compare/v0.2.0...v0.2.1

Commits


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Bump engine.io and socket.io in /kube-watcher

opened on 2022-11-23 21:49:41 by dependabot[bot]

Bumps engine.io to 3.6.1 and updates ancestor dependency socket.io. These dependencies need to be updated together.

Updates engine.io from 3.5.0 to 3.6.1

Release notes

Sourced from engine.io's releases.

3.6.1

:warning: This release contains an important security fix :warning:

A malicious client could send a specially crafted HTTP request, triggering an uncaught exception and killing the Node.js process:

Error: read ECONNRESET
    at TCP.onStreamRead (internal/stream_base_commons.js:209:20)
Emitted 'error' event on Socket instance at:
    at emitErrorNT (internal/streams/destroy.js:106:8)
    at emitErrorCloseNT (internal/streams/destroy.js:74:3)
    at processTicksAndRejections (internal/process/task_queues.js:80:21) {
  errno: -104,
  code: 'ECONNRESET',
  syscall: 'read'
}

Please upgrade as soon as possible.

Bug Fixes

  • catch errors when destroying invalid upgrades (83c4071)

3.6.0

Bug Fixes

  • add extension in the package.json main entry (#608) (3ad0567)
  • do not reset the ping timer after upgrade (1f5d469)

Features

  • decrease the default value of maxHttpBufferSize (58e274c)

This change reduces the default value from 100 mb to a more sane 1 mb.

This helps protect the server against denial of service attacks by malicious clients sending huge amounts of data.

See also: https://github.com/advisories/GHSA-j4f2-536g-r55m

  • increase the default value of pingTimeout (f55a79a)

Links

... (truncated)

Changelog

Sourced from engine.io's changelog.

3.6.1 (2022-11-20)

:warning: This release contains an important security fix :warning:

A malicious client could send a specially crafted HTTP request, triggering an uncaught exception and killing the Node.js process:

Error: read ECONNRESET
    at TCP.onStreamRead (internal/stream_base_commons.js:209:20)
Emitted 'error' event on Socket instance at:
    at emitErrorNT (internal/streams/destroy.js:106:8)
    at emitErrorCloseNT (internal/streams/destroy.js:74:3)
    at processTicksAndRejections (internal/process/task_queues.js:80:21) {
  errno: -104,
  code: 'ECONNRESET',
  syscall: 'read'
}

Please upgrade as soon as possible.

Bug Fixes

  • catch errors when destroying invalid upgrades (83c4071)

6.2.1 (2022-11-20)

:warning: This release contains an important security fix :warning:

A malicious client could send a specially crafted HTTP request, triggering an uncaught exception and killing the Node.js process:

Error: read ECONNRESET
    at TCP.onStreamRead (internal/stream_base_commons.js:209:20)
Emitted 'error' event on Socket instance at:
    at emitErrorNT (internal/streams/destroy.js:106:8)
    at emitErrorCloseNT (internal/streams/destroy.js:74:3)
    at processTicksAndRejections (internal/process/task_queues.js:80:21) {
  errno: -104,
  code: 'ECONNRESET',
  syscall: 'read'
}

Please upgrade as soon as possible.

Bug Fixes

... (truncated)

Commits
  • 67a3a87 chore(release): 3.6.1
  • 83c4071 fix: catch errors when destroying invalid upgrades
  • f62f265 chore(release): 3.6.0
  • f55a79a feat: increase the default value of pingTimeout
  • 1f5d469 fix: do not reset the ping timer after upgrade
  • 3ad0567 fix: add extension in the package.json main entry (#608)
  • 58e274c feat: decrease the default value of maxHttpBufferSize
  • See full diff in compare view


Updates socket.io from 2.4.0 to 2.5.0

Release notes

Sourced from socket.io's releases.

2.5.0

:warning: WARNING :warning:

The default value of the maxHttpBufferSize option has been decreased from 100 MB to 1 MB, in order to prevent attacks by denial of service.

Security advisory: https://github.com/advisories/GHSA-j4f2-536g-r55m

Bug Fixes

  • fix race condition in dynamic namespaces (05e1278)
  • ignore packet received after disconnection (22d4bdf)
  • only set 'connected' to true after middleware execution (226cc16)
  • prevent the socket from joining a room after disconnection (f223178)

Links:

2.4.1

This release reverts the breaking change introduced in 2.4.0 (https://github.com/socketio/socket.io/commit/f78a575f66ab693c3ea96ea88429ddb1a44c86c7).

If you are using Socket.IO v2, you should explicitly allow/disallow cross-origin requests:

  • without CORS (server and client are served from the same domain):
const io = require("socket.io")(httpServer, {
  allowRequest: (req, callback) => {
    callback(null, req.headers.origin === undefined); // cross-origin requests will not be allowed
  }
});
  • with CORS (server and client are served from distinct domains):
io.origins(["http://localhost:3000"]); // for local development
io.origins(["https://example.com"]);

In any case, please consider upgrading to Socket.IO v3, where this security issue is now fixed (CORS is disabled by default).

Reverts

  • fix(security): do not allow all origins by default (a169050)

Links:

... (truncated)

Changelog

Sourced from socket.io's changelog.

2.5.0 (2022-06-26)

Bug Fixes

  • fix race condition in dynamic namespaces (05e1278)
  • ignore packet received after disconnection (22d4bdf)
  • only set 'connected' to true after middleware execution (226cc16)
  • prevent the socket from joining a room after disconnection (f223178)

4.5.1 (2022-05-17)

Bug Fixes

  • forward the local flag to the adapter when using fetchSockets() (30430f0)
  • typings: add HTTPS server to accepted types (#4351) (9b43c91)

4.5.0 (2022-04-23)

Bug Fixes

  • typings: ensure compatibility with TypeScript 3.x (#4259) (02c87a8)

Features

  • add support for catch-all listeners for outgoing packets (531104d)

This is similar to onAny(), but for outgoing packets.

Syntax:

socket.onAnyOutgoing((event, ...args) => {
  console.log(event);
});
  • broadcast and expect multiple acks (8b20457)

Syntax:

io.timeout(1000).emit("some-event", (err, responses) => {
</tr></table>

... (truncated)

Commits
  • baa6804 chore(release): 2.5.0
  • f223178 fix: prevent the socket from joining a room after disconnection
  • 226cc16 fix: only set 'connected' to true after middleware execution
  • 05e1278 fix: fix race condition in dynamic namespaces
  • 22d4bdf fix: ignore packet received after disconnection
  • dfded53 chore: update engine.io version to 3.6.0
  • e6b8697 chore(release): 2.4.1
  • a169050 revert: fix(security): do not allow all origins by default
  • See full diff in compare view


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You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot merge` will merge this PR after your CI passes on it - `@dependabot squash and merge` will squash and merge this PR after your CI passes on it - `@dependabot cancel merge` will cancel a previously requested merge and block automerging - `@dependabot reopen` will reopen this PR if it is closed - `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually - `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself) - `@dependabot use these labels` will set the current labels as the default for future PRs for this repo and language - `@dependabot use these reviewers` will set the current reviewers as the default for future PRs for this repo and language - `@dependabot use these assignees` will set the current assignees as the default for future PRs for this repo and language - `@dependabot use this milestone` will set the current milestone as the default for future PRs for this repo and language You can disable automated security fix PRs for this repo from the [Security Alerts page](https://github.com/IBM/kubefly/network/alerts).
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