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1
slides/_redirects
Normal file
1
slides/_redirects
Normal file
@@ -0,0 +1 @@
|
||||
/ /kube-halfday.yml.html 200!
|
||||
@@ -171,11 +171,7 @@ class: pic
|
||||
|
||||
---
|
||||
|
||||
## Do we need to run Docker at all?
|
||||
|
||||
No!
|
||||
|
||||
--
|
||||
## Default container runtime
|
||||
|
||||
- By default, Kubernetes uses the Docker Engine to run containers
|
||||
|
||||
@@ -185,42 +181,6 @@ No!
|
||||
|
||||
(like CRI-O, or containerd)
|
||||
|
||||
---
|
||||
|
||||
## Do we need to run Docker at all?
|
||||
|
||||
Yes!
|
||||
|
||||
--
|
||||
|
||||
- In this workshop, we run our app on a single node first
|
||||
|
||||
- We will need to build images and ship them around
|
||||
|
||||
- We can do these things without Docker
|
||||
<br/>
|
||||
(and get diagnosed with NIH¹ syndrome)
|
||||
|
||||
- Docker is still the most stable container engine today
|
||||
<br/>
|
||||
(but other options are maturing very quickly)
|
||||
|
||||
.footnote[¹[Not Invented Here](https://en.wikipedia.org/wiki/Not_invented_here)]
|
||||
|
||||
---
|
||||
|
||||
## Do we need to run Docker at all?
|
||||
|
||||
- On our development environments, CI pipelines ... :
|
||||
|
||||
*Yes, almost certainly*
|
||||
|
||||
- On our production servers:
|
||||
|
||||
*Yes (today)*
|
||||
|
||||
*Probably not (in the future)*
|
||||
|
||||
.footnote[More information about CRI [on the Kubernetes blog](https://kubernetes.io/blog/2016/12/container-runtime-interface-cri-in-kubernetes)]
|
||||
|
||||
---
|
||||
@@ -235,11 +195,12 @@ Yes!
|
||||
|
||||
- node (a machine — physical or virtual — in our cluster)
|
||||
- pod (group of containers running together on a node)
|
||||
- IP addresses are associated with *pods*, not with individual containers
|
||||
- service (stable network endpoint to connect to one or multiple containers)
|
||||
- namespace (more-or-less isolated group of things)
|
||||
- secret (bundle of sensitive data to be passed to a container)
|
||||
|
||||
And much more!
|
||||
|
||||
- And much more!
|
||||
|
||||
- We can see the full list by running `kubectl api-resources`
|
||||
|
||||
@@ -250,25 +211,3 @@ Yes!
|
||||
class: pic
|
||||
|
||||

|
||||
|
||||
---
|
||||
|
||||
class: pic
|
||||
|
||||

|
||||
|
||||
---
|
||||
|
||||
## Credits
|
||||
|
||||
- The first diagram is courtesy of Weave Works
|
||||
|
||||
- a *pod* can have multiple containers working together
|
||||
|
||||
- IP addresses are associated with *pods*, not with individual containers
|
||||
|
||||
- The second diagram is courtesy of Lucas Käldström, in [this presentation](https://speakerdeck.com/luxas/kubeadm-cluster-creation-internals-from-self-hosting-to-upgradability-and-ha)
|
||||
|
||||
- it's one of the best Kubernetes architecture diagrams available!
|
||||
|
||||
Both diagrams used with permission.
|
||||
|
||||
@@ -268,7 +268,7 @@ The master node has [taints](https://kubernetes.io/docs/concepts/configuration/t
|
||||
|
||||
- Check the logs of all the pods having a label `run=rng`:
|
||||
```bash
|
||||
kubectl logs -l run=rng --tail 1
|
||||
kubectl get pods -l run=rng -o name | xargs -n 1 kubectl logs --tail 1
|
||||
```
|
||||
|
||||
]
|
||||
|
||||
@@ -4,22 +4,6 @@ Our app on Kube
|
||||
|
||||
---
|
||||
|
||||
## What's on the menu?
|
||||
|
||||
In this part, we will:
|
||||
|
||||
- **build** images for our app,
|
||||
|
||||
- **ship** these images with a registry,
|
||||
|
||||
- **run** deployments using these images,
|
||||
|
||||
- expose these deployments so they can communicate with each other,
|
||||
|
||||
- expose the web UI so we can access it from outside.
|
||||
|
||||
---
|
||||
|
||||
## The plan
|
||||
|
||||
- Build on our control node (`node1`)
|
||||
@@ -131,47 +115,6 @@ We should see:
|
||||
|
||||
---
|
||||
|
||||
## Testing our local registry
|
||||
|
||||
- We can retag a small image, and push it to the registry
|
||||
|
||||
.exercise[
|
||||
|
||||
- Make sure we have the busybox image, and retag it:
|
||||
```bash
|
||||
docker pull busybox
|
||||
docker tag busybox $REGISTRY/busybox
|
||||
```
|
||||
|
||||
- Push it:
|
||||
```bash
|
||||
docker push $REGISTRY/busybox
|
||||
```
|
||||
|
||||
]
|
||||
|
||||
---
|
||||
|
||||
## Checking again what's on our local registry
|
||||
|
||||
- Let's use the same endpoint as before
|
||||
|
||||
.exercise[
|
||||
|
||||
- Ensure that our busybox image is now in the local registry:
|
||||
```bash
|
||||
curl $REGISTRY/v2/_catalog
|
||||
```
|
||||
|
||||
]
|
||||
|
||||
The curl command should now output:
|
||||
```json
|
||||
{"repositories":["busybox"]}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Building and pushing our images
|
||||
|
||||
- We are going to use a convenient feature of Docker Compose
|
||||
|
||||
@@ -36,10 +36,6 @@
|
||||
|
||||
(At least ... not yet! Though it's [experimental in 1.12](https://kubernetes.io/docs/setup/independent/high-availability/).)
|
||||
|
||||
--
|
||||
|
||||
- "It's still twice as many steps as setting up a Swarm cluster 😕" -- Jérôme
|
||||
|
||||
---
|
||||
|
||||
## Other deployment options
|
||||
|
||||
@@ -1,6 +1,6 @@
|
||||
## Versions installed
|
||||
|
||||
- Kubernetes 1.12.0
|
||||
- Kubernetes 1.12.1
|
||||
- Docker Engine 18.06.1-ce
|
||||
- Docker Compose 1.21.1
|
||||
|
||||
|
||||
@@ -1,26 +1,3 @@
|
||||
# Next steps
|
||||
|
||||
*Alright, how do I get started and containerize my apps?*
|
||||
|
||||
--
|
||||
|
||||
Suggested containerization checklist:
|
||||
|
||||
.checklist[
|
||||
- write a Dockerfile for one service in one app
|
||||
- write Dockerfiles for the other (buildable) services
|
||||
- write a Compose file for that whole app
|
||||
- make sure that devs are empowered to run the app in containers
|
||||
- set up automated builds of container images from the code repo
|
||||
- set up a CI pipeline using these container images
|
||||
- set up a CD pipeline (for staging/QA) using these images
|
||||
]
|
||||
|
||||
And *then* it is time to look at orchestration!
|
||||
|
||||
---
|
||||
|
||||
|
||||
## Options for our first production cluster
|
||||
|
||||
- Get a managed cluster from a major cloud provider (AKS, EKS, GKE...)
|
||||
@@ -57,26 +34,6 @@ And *then* it is time to look at orchestration!
|
||||
|
||||
---
|
||||
|
||||
## Namespaces
|
||||
|
||||
- Namespaces let you run multiple identical stacks side by side
|
||||
|
||||
- Two namespaces (e.g. `blue` and `green`) can each have their own `redis` service
|
||||
|
||||
- Each of the two `redis` services has its own `ClusterIP`
|
||||
|
||||
- CoreDNS creates two entries, mapping to these two `ClusterIP` addresses:
|
||||
|
||||
`redis.blue.svc.cluster.local` and `redis.green.svc.cluster.local`
|
||||
|
||||
- Pods in the `blue` namespace get a *search suffix* of `blue.svc.cluster.local`
|
||||
|
||||
- As a result, resolving `redis` from a pod in the `blue` namespace yields the "local" `redis`
|
||||
|
||||
.warning[This does not provide *isolation*! That would be the job of network policies.]
|
||||
|
||||
---
|
||||
|
||||
## Stateful services (databases etc.)
|
||||
|
||||
- As a first step, it is wiser to keep stateful services *outside* of the cluster
|
||||
@@ -236,16 +193,3 @@ Sorry Star Trek fans, this is not the federation you're looking for!
|
||||
|
||||
- Discover resources across clusters
|
||||
|
||||
---
|
||||
|
||||
## Developer experience
|
||||
|
||||
*We've put this last, but it's pretty important!*
|
||||
|
||||
- How do you on-board a new developer?
|
||||
|
||||
- What do they need to install to get a dev stack?
|
||||
|
||||
- How does a code change make it from dev to prod?
|
||||
|
||||
- How does someone add a component to a stack?
|
||||
|
||||
@@ -35,19 +35,18 @@ chapters:
|
||||
- - k8s/kubectlrun.md
|
||||
- k8s/kubectlexpose.md
|
||||
- k8s/ourapponkube.md
|
||||
#- k8s/kubectlproxy.md
|
||||
#- k8s/localkubeconfig.md
|
||||
#- k8s/accessinternal.md
|
||||
- k8s/kubectlproxy.md
|
||||
# - k8s/localkubeconfig.md
|
||||
# - k8s/accessinternal.md
|
||||
- - k8s/dashboard.md
|
||||
- k8s/kubectlscale.md
|
||||
- k8s/daemonset.md
|
||||
- k8s/rollout.md
|
||||
- - k8s/logs-cli.md
|
||||
# Bridget hasn't added EFK yet
|
||||
#- k8s/logs-centralized.md
|
||||
# - k8s/logs-centralized.md
|
||||
- k8s/helm.md
|
||||
- k8s/namespaces.md
|
||||
#- k8s/netpol.md
|
||||
- k8s/netpol.md
|
||||
- k8s/whatsnext.md
|
||||
# - k8s/links.md
|
||||
# Bridget-specific
|
||||
|
||||
@@ -2,15 +2,26 @@
|
||||
|
||||
- Hello! We are:
|
||||
|
||||
- .emoji[✨] Bridget ([@bridgetkromhout](https://twitter.com/bridgetkromhout))
|
||||
- .emoji[✨] Bridget Kromhout ([@bridgetkromhout](https://twitter.com/bridgetkromhout))
|
||||
|
||||
- .emoji[🌟] Joe ([@joelaha](https://twitter.com/joelaha))
|
||||
- .emoji[🌟] Joe Laha ([@joelaha](https://twitter.com/joelaha))
|
||||
|
||||
- The workshop will run from 13:30-16:45
|
||||
- The workshop will run from 9:30 - 13:00
|
||||
|
||||
- There will be a break from 15:00-15:15
|
||||
- There will be a break from 11:00 - 11:30
|
||||
|
||||
- Feel free to interrupt for questions at any time
|
||||
|
||||
- *Especially when you see full screen container pictures!*
|
||||
|
||||
---
|
||||
|
||||
## Say hi!
|
||||
|
||||
- We encourage networking at [#velocityconf](https://twitter.com/hashtag/velocityconf?f=tweets&vertical=default&src=hash)
|
||||
|
||||
- Take a minute to introduce yourself to your neighbors
|
||||
|
||||
- Tell them where you're from (where you're based out of & what org you work at)
|
||||
|
||||
- Share what you're hoping to learn in this session! .emoji[✨]
|
||||
|
||||
@@ -1,46 +1,4 @@
|
||||
# Pre-requirements
|
||||
|
||||
- Be comfortable with the UNIX command line
|
||||
|
||||
- navigating directories
|
||||
|
||||
- editing files
|
||||
|
||||
- a little bit of bash-fu (environment variables, loops)
|
||||
|
||||
- Some Docker knowledge
|
||||
|
||||
- `docker run`, `docker ps`, `docker build`
|
||||
|
||||
- ideally, you know how to write a Dockerfile and build it
|
||||
<br/>
|
||||
(even if it's a `FROM` line and a couple of `RUN` commands)
|
||||
|
||||
- It's totally OK if you are not a Docker expert!
|
||||
|
||||
---
|
||||
|
||||
class: title
|
||||
|
||||
*Tell me and I forget.*
|
||||
<br/>
|
||||
*Teach me and I remember.*
|
||||
<br/>
|
||||
*Involve me and I learn.*
|
||||
|
||||
Misattributed to Benjamin Franklin
|
||||
|
||||
[(Probably inspired by Chinese Confucian philosopher Xunzi)](https://www.barrypopik.com/index.php/new_york_city/entry/tell_me_and_i_forget_teach_me_and_i_may_remember_involve_me_and_i_will_lear/)
|
||||
|
||||
---
|
||||
|
||||
## Hands-on sections
|
||||
|
||||
- The whole workshop is hands-on
|
||||
|
||||
- We are going to build, ship, and run containers!
|
||||
|
||||
- You are invited to reproduce all the demos
|
||||
## Hands-on
|
||||
|
||||
- All hands-on sections are clearly identified, like the gray rectangle below
|
||||
|
||||
@@ -50,53 +8,10 @@ Misattributed to Benjamin Franklin
|
||||
|
||||
- Go to @@SLIDES@@ to view these slides
|
||||
|
||||
- Join the chat room: @@CHAT@@
|
||||
|
||||
<!-- ```open @@SLIDES@@``` -->
|
||||
|
||||
]
|
||||
|
||||
---
|
||||
|
||||
class: in-person
|
||||
|
||||
## Where are we going to run our containers?
|
||||
|
||||
---
|
||||
|
||||
class: in-person, pic
|
||||
|
||||

|
||||
|
||||
---
|
||||
|
||||
class: in-person
|
||||
|
||||
## You get a cluster of cloud VMs
|
||||
|
||||
- Each person gets a private cluster of cloud VMs (not shared with anybody else)
|
||||
|
||||
- They'll remain up for the duration of the workshop
|
||||
|
||||
- You should have a little card with login+password+IP addresses
|
||||
|
||||
- You can automatically SSH from one VM to another
|
||||
|
||||
- The nodes have aliases: `node1`, `node2`, etc.
|
||||
|
||||
---
|
||||
|
||||
class: in-person
|
||||
|
||||
## Why don't we run containers locally?
|
||||
|
||||
- Installing that stuff can be hard on some machines
|
||||
|
||||
(32 bits CPU or OS... Laptops without administrator access... etc.)
|
||||
|
||||
- *"The whole team downloaded all these container images from the WiFi!
|
||||
<br/>... and it went great!"* (Literally no-one ever)
|
||||
|
||||
- All you need is a computer (or even a phone or tablet!), with:
|
||||
|
||||
- an internet connection
|
||||
@@ -109,203 +24,18 @@ class: in-person
|
||||
|
||||
class: in-person
|
||||
|
||||
## SSH clients
|
||||
|
||||
- On Linux, OS X, FreeBSD... you are probably all set
|
||||
|
||||
- On Windows, get one of these:
|
||||
|
||||
- [putty](http://www.putty.org/)
|
||||
- Microsoft [Win32 OpenSSH](https://github.com/PowerShell/Win32-OpenSSH/wiki/Install-Win32-OpenSSH)
|
||||
- [Git BASH](https://git-for-windows.github.io/)
|
||||
- [MobaXterm](http://mobaxterm.mobatek.net/)
|
||||
|
||||
- On Android, [JuiceSSH](https://juicessh.com/)
|
||||
([Play Store](https://play.google.com/store/apps/details?id=com.sonelli.juicessh))
|
||||
works pretty well
|
||||
|
||||
- Nice-to-have: [Mosh](https://mosh.org/) instead of SSH, if your internet connection tends to lose packets
|
||||
|
||||
---
|
||||
|
||||
class: in-person, extra-details
|
||||
|
||||
## What is this Mosh thing?
|
||||
|
||||
*You don't have to use Mosh or even know about it to follow along.
|
||||
<br/>
|
||||
We're just telling you about it because some of us think it's cool!*
|
||||
|
||||
- Mosh is "the mobile shell"
|
||||
|
||||
- It is essentially SSH over UDP, with roaming features
|
||||
|
||||
- It retransmits packets quickly, so it works great even on lossy connections
|
||||
|
||||
(Like hotel or conference WiFi)
|
||||
|
||||
- It has intelligent local echo, so it works great even in high-latency connections
|
||||
|
||||
(Like hotel or conference WiFi)
|
||||
|
||||
- It supports transparent roaming when your client IP address changes
|
||||
|
||||
(Like when you hop from hotel to conference WiFi)
|
||||
|
||||
---
|
||||
|
||||
class: in-person, extra-details
|
||||
|
||||
## Using Mosh
|
||||
|
||||
- To install it: `(apt|yum|brew) install mosh`
|
||||
|
||||
- It has been pre-installed on the VMs that we are using
|
||||
|
||||
- To connect to a remote machine: `mosh user@host`
|
||||
|
||||
(It is going to establish an SSH connection, then hand off to UDP)
|
||||
|
||||
- It requires UDP ports to be open
|
||||
|
||||
(By default, it uses a UDP port between 60000 and 61000)
|
||||
|
||||
---
|
||||
|
||||
class: in-person
|
||||
|
||||
## Connecting to our lab environment
|
||||
|
||||
.exercise[
|
||||
|
||||
- Log into the first VM (`node1`) with your SSH client
|
||||
|
||||
<!--
|
||||
```bash
|
||||
for N in $(awk '/\Wnode/{print $2}' /etc/hosts); do
|
||||
ssh -o StrictHostKeyChecking=no $N true
|
||||
done
|
||||
```
|
||||
|
||||
```bash
|
||||
if which kubectl; then
|
||||
kubectl get deploy,ds -o name | xargs -rn1 kubectl delete
|
||||
kubectl get all -o name | grep -v service/kubernetes | xargs -rn1 kubectl delete --ignore-not-found=true
|
||||
kubectl -n kube-system get deploy,svc -o name | grep -v dns | xargs -rn1 kubectl -n kube-system delete
|
||||
fi
|
||||
```
|
||||
-->
|
||||
|
||||
- Check that you can SSH (without password) to `node2`:
|
||||
```bash
|
||||
ssh node2
|
||||
```
|
||||
- Type `exit` or `^D` to come back to `node1`
|
||||
|
||||
<!-- ```bash exit``` -->
|
||||
|
||||
]
|
||||
|
||||
If anything goes wrong — ask for help!
|
||||
|
||||
---
|
||||
|
||||
## Doing or re-doing the workshop on your own?
|
||||
|
||||
- Use something like
|
||||
[Play-With-Docker](http://play-with-docker.com/) or
|
||||
[Play-With-Kubernetes](https://training.play-with-kubernetes.com/)
|
||||
|
||||
Zero setup effort; but environment are short-lived and
|
||||
might have limited resources
|
||||
|
||||
- Create your own cluster (local or cloud VMs)
|
||||
|
||||
Small setup effort; small cost; flexible environments
|
||||
|
||||
- Create a bunch of clusters for you and your friends
|
||||
([instructions](https://@@GITREPO@@/tree/master/prepare-vms))
|
||||
|
||||
Bigger setup effort; ideal for group training
|
||||
|
||||
---
|
||||
|
||||
class: self-paced
|
||||
|
||||
## Get your own Docker nodes
|
||||
|
||||
- If you already have some Docker nodes: great!
|
||||
|
||||
- If not: let's get some thanks to Play-With-Docker
|
||||
|
||||
.exercise[
|
||||
|
||||
- Go to http://www.play-with-docker.com/
|
||||
|
||||
- Log in
|
||||
|
||||
- Create your first node
|
||||
|
||||
<!-- ```open http://www.play-with-docker.com/``` -->
|
||||
|
||||
]
|
||||
|
||||
You will need a Docker ID to use Play-With-Docker.
|
||||
|
||||
(Creating a Docker ID is free.)
|
||||
|
||||
---
|
||||
|
||||
## We will (mostly) interact with node1 only
|
||||
|
||||
*These remarks apply only when using multiple nodes, of course.*
|
||||
|
||||
- Unless instructed, **all commands must be run from the first VM, `node1`**
|
||||
|
||||
- We will only checkout/copy the code on `node1`
|
||||
|
||||
- During normal operations, we do not need access to the other nodes
|
||||
|
||||
- If we had to troubleshoot issues, we would use a combination of:
|
||||
|
||||
- SSH (to access system logs, daemon status...)
|
||||
|
||||
- Docker API (to check running containers and container engine status)
|
||||
|
||||
---
|
||||
|
||||
## Terminals
|
||||
|
||||
Once in a while, the instructions will say:
|
||||
<br/>"Open a new terminal."
|
||||
|
||||
There are multiple ways to do this:
|
||||
|
||||
- create a new window or tab on your machine, and SSH into the VM;
|
||||
|
||||
- use screen or tmux on the VM and open a new window from there.
|
||||
|
||||
You are welcome to use the method that you feel the most comfortable with.
|
||||
|
||||
---
|
||||
|
||||
## Tmux cheatsheet
|
||||
|
||||
[Tmux](https://en.wikipedia.org/wiki/Tmux) is a terminal multiplexer like `screen`.
|
||||
|
||||
*You don't have to use it or even know about it to follow along.
|
||||
<br/>
|
||||
But some of us like to use it to switch between terminals.
|
||||
<br/>
|
||||
It has been preinstalled on your workshop nodes.*
|
||||
|
||||
- Ctrl-b c → creates a new window
|
||||
- Ctrl-b n → go to next window
|
||||
- Ctrl-b p → go to previous window
|
||||
- Ctrl-b " → split window top/bottom
|
||||
- Ctrl-b % → split window left/right
|
||||
- Ctrl-b Alt-1 → rearrange windows in columns
|
||||
- Ctrl-b Alt-2 → rearrange windows in rows
|
||||
- Ctrl-b arrows → navigate to other windows
|
||||
- Ctrl-b d → detach session
|
||||
- tmux attach → reattach to session
|
||||
|
||||
@@ -77,79 +77,6 @@ and displays aggregated logs.
|
||||
|
||||
---
|
||||
|
||||
class: extra-details
|
||||
|
||||
## Compose file format version
|
||||
|
||||
*Particularly relevant if you have used Compose before...*
|
||||
|
||||
- Compose 1.6 introduced support for a new Compose file format (aka "v2")
|
||||
|
||||
- Services are no longer at the top level, but under a `services` section
|
||||
|
||||
- There has to be a `version` key at the top level, with value `"2"` (as a string, not an integer)
|
||||
|
||||
- Containers are placed on a dedicated network, making links unnecessary
|
||||
|
||||
- There are other minor differences, but upgrade is easy and straightforward
|
||||
|
||||
---
|
||||
|
||||
## Service discovery in container-land
|
||||
|
||||
- We do not hard-code IP addresses in the code
|
||||
|
||||
- We do not hard-code FQDN in the code, either
|
||||
|
||||
- We just connect to a service name, and container-magic does the rest
|
||||
|
||||
(And by container-magic, we mean "a crafty, dynamic, embedded DNS server")
|
||||
|
||||
---
|
||||
|
||||
## Example in `worker/worker.py`
|
||||
|
||||
```python
|
||||
redis = Redis("`redis`")
|
||||
|
||||
|
||||
def get_random_bytes():
|
||||
r = requests.get("http://`rng`/32")
|
||||
return r.content
|
||||
|
||||
|
||||
def hash_bytes(data):
|
||||
r = requests.post("http://`hasher`/",
|
||||
data=data,
|
||||
headers={"Content-Type": "application/octet-stream"})
|
||||
```
|
||||
|
||||
(Full source code available [here](
|
||||
https://@@GITREPO@@/blob/8279a3bce9398f7c1a53bdd95187c53eda4e6435/dockercoins/worker/worker.py#L17
|
||||
))
|
||||
|
||||
---
|
||||
|
||||
class: extra-details
|
||||
|
||||
## Links, naming, and service discovery
|
||||
|
||||
- Containers can have network aliases (resolvable through DNS)
|
||||
|
||||
- Compose file version 2+ makes each container reachable through its service name
|
||||
|
||||
- Compose file version 1 did require "links" sections
|
||||
|
||||
- Network aliases are automatically namespaced
|
||||
|
||||
- you can have multiple apps declaring and using a service named `database`
|
||||
|
||||
- containers in the blue app will resolve `database` to the IP of the blue database
|
||||
|
||||
- containers in the green app will resolve `database` to the IP of the green database
|
||||
|
||||
---
|
||||
|
||||
## What's this application?
|
||||
|
||||
--
|
||||
@@ -240,50 +167,6 @@ Stop the app with `^C`, edit `dockercoins.yml`, comment out the `volumes` sectio
|
||||
|
||||
---
|
||||
|
||||
class: extra-details
|
||||
|
||||
## Why does the speed seem irregular?
|
||||
|
||||
- It *looks like* the speed is approximately 4 hashes/second
|
||||
|
||||
- Or more precisely: 4 hashes/second, with regular dips down to zero
|
||||
|
||||
- Why?
|
||||
|
||||
--
|
||||
|
||||
class: extra-details
|
||||
|
||||
- The app actually has a constant, steady speed: 3.33 hashes/second
|
||||
<br/>
|
||||
(which corresponds to 1 hash every 0.3 seconds, for *reasons*)
|
||||
|
||||
- Yes, and?
|
||||
|
||||
---
|
||||
|
||||
class: extra-details
|
||||
|
||||
## The reason why this graph is *not awesome*
|
||||
|
||||
- The worker doesn't update the counter after every loop, but up to once per second
|
||||
|
||||
- The speed is computed by the browser, checking the counter about once per second
|
||||
|
||||
- Between two consecutive updates, the counter will increase either by 4, or by 0
|
||||
|
||||
- The perceived speed will therefore be 4 - 4 - 4 - 0 - 4 - 4 - 0 etc.
|
||||
|
||||
- What can we conclude from this?
|
||||
|
||||
--
|
||||
|
||||
class: extra-details
|
||||
|
||||
- "I'm clearly incapable of writing good frontend code!" 😀 — Jérôme
|
||||
|
||||
---
|
||||
|
||||
## Stopping the application
|
||||
|
||||
- If we interrupt Compose (with `^C`), it will politely ask the Docker Engine to stop the app
|
||||
|
||||
@@ -4,8 +4,15 @@ Thank you!
|
||||
|
||||
---
|
||||
|
||||
class: title, in-person
|
||||
# Thank you!
|
||||
|
||||
That's all, folks! <br/> Questions?
|
||||
- The clusters will be shut down tonight
|
||||
|
||||
- If you like:
|
||||
|
||||
- [rate this tutorial on the Velocity website](https://conferences.oreilly.com/velocity/vl-eu/public/schedule/evaluate/71149?eval=71149)
|
||||
|
||||
- [tweet about what you learned](https://twitter.com/intent/tweet?url=https%3A%2F%2Fcontainer.training&text=Learning%20k8s%20with%20@bridgetkromhout%21&hashtags=VelocityConf), mentioning @bridgetkromhout and #VelocityConf
|
||||
|
||||
- [questions, comments, pull requests, workshop invitations, etc](https://github.com/jpetazzo/container.training/)
|
||||
|
||||

|
||||
|
||||
@@ -8,7 +8,13 @@ class: title, self-paced
|
||||
|
||||
class: title, in-person
|
||||
|
||||
@@TITLE@@<br/></br>
|
||||
@@TITLE@@
|
||||
|
||||
WiFi: OReillyCon<br>
|
||||
Password: oreilly18
|
||||
|
||||
<br>
|
||||
<br>
|
||||
|
||||
.footnote[
|
||||
**Be kind to the WiFi!**<br/>
|
||||
|
||||
Reference in New Issue
Block a user