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Kubernetes
+ Python
=
CLOUD NATIVE PRAGUE
2019-09-05
HENNING JACOBS
@try_except_
2
ZALANDO AT A GLANCE
~ 5.4billion EUR
revenue 2018
> 250
million
visits
per
month
> 15.000
employees in
Europe
> 79%
of visits via
mobile devices
> 26
million
active customers
> 300.000
product choices
~ 2.000
brands
17
countries
3
SCALE
140Clusters
396Accounts
4
PYTHON
• Very popular
• Easy to learn
• Huge community
5
PYTHON
6
PYTHON IN ZALANDO
61 (Go) vs 257 (Python) profiles
14k (Go) vs 52k (Python) internal GitHub hits
Machine Learning / Data Science
7
RUNNING PYTHON ON KUBERNETES
8
RUNNING PYTHON ON KUBERNETES
⇒ ~114 MiB Docker image
9
DEPLOYMENT MANIFEST
Security "stuff"
Never without a
readinessProbe
10
HELLO, WORLD
kubectl apply -f deployment.yaml
kubectl port-forward service/aiohttp-helloworld 8080:80
http localhost:8080
HTTPie
11
HOW TO USE KUBERNETES
1. run
"Hello World"
2. configure
the rest of your app
12
IS IT FAST ENOUGH?
echo 'GET http://localhost:8080' | vegeta attack -rate 200 | vegeta report
Requests [total, rate] 3300, 200.06
Duration [total, attack, wait] 16.498s, 16.494, 3.261ms
Latencies [mean, 50, 95, 99, max] 3.185ms, 3.229ms,
4.182ms, 4.791ms,
21.153ms
Bytes In [total, mean] 39600, 12.00
Bytes Out [total, mean] 0, 0.00
Success [ratio] 100.00%
Status Codes [code:count] 200:3300
local run on my laptop, single Pod in kind cluster
13
RUNNING PYTHON ON KUBERNETES
14
"GRACEFUL" TERMINATION IN KUBERNETES
1. kubectl delete pod
2. SIGTERM + remove endpoints
3. grace period (default: 30s)
4. SIGKILL
⇒ Going down on SIGTERM leads to request errors
kube-proxy/ iptables,
Load Balancer update
15
TESTING THE ROLLING UPDATE
tests/e2e/test_update.py::test_rolling_update_no_signal_handling
Elapsed: 41.60 seconds
Successes: 2056
Errors: 0
Requests/s: 49.42 rps
tests/e2e/test_update.py::test_rolling_update_with_signal_handling
Elapsed: 15.16 seconds
Successes: 816
Errors: 2
Requests/s: 53.95 rps
16
ALTERNATIVE: THE PRESTOP TRICK
...
17
TESTING WITH PYTEST AND KIND
18
RUNNING PYTHON ON KUBERNETES
19
TESTING WITH PYTEST AND KIND
https://pypi.org/project/pytest-kind/
20
USING KIND CLUSTER DIRECTLY
https://pypi.org/project/pytest-kind/
21
ACCESSING KUBERNETES FROM PYTHON
22
ACCESSING KUBERNETES FROM PYTHON
• Official Kubernetes client - github.com/kubernetes-client/python
• Pykube-ng - github.com/hjacobs/pykube
du -csh /../../lib/python3.7/site-packages/kubernetes/
23M total
du -csh /../../lib/python3.7/site-packages/pykube/
160K total
23
LISTING CONTAINER IMAGES
24
OFFICIAL CLIENT VS PYKUBE-NG
• "Official"
• Generated (Swagger Codegen)
• Less "Pythonic"
• urllib3
• Supports many auth methods
• Heavy (23 MiB)
• Python 2.7 and 3
• Kel project 2015
• Dynamic
• More "Pythonic"
• requests
• Limited auth methods
• Light (160 KiB)
• Only Python 3
25
INTERACTIVE CONSOLE
$ pip3 install pykube-ng
$ python3 -m pykube
Pykube v19.9.1, loaded "/home/hjacobs/.kube/config" with context "mycluster".
Example commands:
[d.name for d in Deployment.objects(api)] # get names of deployments in default namespace
list(DaemonSet.objects(api, namespace='kube-system')) # list daemonsets in "kube-system"
Pod.objects(api).get_by_name('mypod').labels # labels of pod "mypod"
Use Ctrl-D to exit
>>>
26
WRITING A SIMPLE CONTROLLER
27
DOWNSCALING DURING OFF-HOURS
github.com/hjacobs/kube-downscaler
Weekend
28
DOWNSCALING DURING OFF-HOURS
DEFAULT_UPTIME="Mon-Fri 07:30-20:30 CET"
annotations:
downscaler/exclude: "true"
github.com/hjacobs/kube-downscaler
29
HOUSEKEEPING
● Delete prototypes
after X days
● Clean up temporary
deployments
● Remove resources
without owner
30
KUBERNETES JANITOR
● TTL and expiry date annotations, e.g.
○ set time-to-live for your test deployment
● Custom rules, e.g.
○ delete everything without "app" label after 7 days
github.com/hjacobs/kube-janitor
31
JANITOR TTL ANNOTATION
# let's try out nginx, but only for 1 hour
kubectl run nginx --image=nginx
kubectl annotate deploy nginx janitor/ttl=1h
github.com/hjacobs/kube-janitor
32
EXTENDING KUBERNETES WITH OPERATORS
33
ELASTICSEARCH OPERATOR
github.com/zalando-incubator/es-operator
34
WRITING AN OPERATOR
35
MAKE A FRAMEWORK!
github.com/zalando-incubator/kopf
36
KOPF: SIMPLE SPY-HANDLERS
React on events from K8s API.
Raw payload, no interpretation. Fire-and-forget, ignore errors.
github.com/zalando-incubator/kopf
37
KOPF: CONVENIENT CAUSE AND DIFF HANDLERS
github.com/zalando-incubator/kopf
38
RUNNING FROM DEVELOPMENT ENVIRONMENT
github.com/zalando-incubator/kopf
And here we are! Creating: {'duration': '1m', 'field': 'value',
'items': ['item1', 'item2']}
[2019-02-25 14:06:54,742] kopf.reactor.handlin [INFO ]
[asf-preprocessing/kopf-example-1] Handler create_fn succeeded.
[2019-02-25 14:06:54,856] kopf.reactor.handlin [INFO ]
[asf-preprocessing/kopf-example-1] All handlers succeeded for
creation.
Name: kopf-example-1
...
Status:
create_fn:
Message: hello world
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Success 81s kopf Handler create_fn succeeded.
$ kopf run scripts.py [--verbose]
$ kubectl apply -f ../obj.yaml
$ kubectl describe -f ../obj.yaml
39
"HELLO WORLD" EXAMPLE: CRD
github.com/zalando-incubator/kopfgithub.com/zalando-incubator/kopf
40
8 LINES OF PYTHON
github.com/zalando-incubator/kopfgithub.com/zalando-incubator/kopf
41
4 LINES OF DOCKER
github.com/zalando-incubator/kopfgithub.com/zalando-incubator/kopf
42
CRD OBJECT
github.com/zalando-incubator/kopfgithub.com/zalando-incubator/kopf
43
STATUS: "HELLO PRAGUE!"
github.com/zalando-incubator/kopfgithub.com/zalando-incubator/kopf
44
VMWORLD 2019 SESSION WITH KOPF
github.com/embano1/kopf-operator-vmworld
45
KOPF: FEATURES
• Custom & built-in resources supported (CRDs, Pods, Services, etc)
• Agnostic to API clients: kubernetes-client, pykube-ng, raw HTTP, etc
• Immediate reaction to changes and events
• Predefined behavioural patterns:
• Simple spy-handlers for event watching
• Advanced cause & diff detection for actual change tracking
• Retry-until-success approach to handlers
• Operator resilience:
• Restores its state on restarts
• Operator testing toolkit (minimally sufficient)
github.com/zalando-incubator/kopfgithub.com/zalando-incubator/kopf
46
TESTING WITH KIND
pypi.org/project/pytest-kind/
Kubernetes Web View
"kubectl for the web"
48
MOTIVATION: CHAT PING-PONG
49
MOTIVATION: PENDING PODS INCIDENT
⇒ I want to see all "Pending" Pods across all clusters!
50
MOTIVATION
51
SOME USE CASES
Support interactions with colleagues
• share links
• avoid human mistakes (wrong cluster login on CLI, "-n" param, ..)
• deep link to resource YAML
Incident response and investigation
• find a resource by name across clusters to help troubleshoot
• find pending pods across all clusters
• help identify if a problem is only in one cluster or multiple ones
52
MOTIVATION
srcco.de/posts/kubernetes-web-uis-in-2019.html
53
SOME USE CASES
54
SEARCHING FOR DOCKER IMAGE
55
SOME USE CASES
56
CRDS
additionalPrinterColumns
57
UPGRADE TO KUBERNETES 1.14
"Found 1223 rows for 1 resource type in 148 clusters in 3.301 seconds."
58
RESOURCE YAML VIEW
59
MULTIPLE CONDITIONS
kubectl -l application=coredns
60
MULTIPLE RESOURCE TYPES
kubectl get
pods,stacks,deploys,..
61
LABEL & CUSTOM COLUMNS
labelcols=application
customcols=CPU+Requests=join(', ', spec.containers[*].resources.requests.cpu)
uses JMESPath expression
62
URL STRUCTURE
/clusters/{cluster}/namespaces/{namespace}/{resource-type}
cluster: cluster aliases separated by "," or "_all"
namespace: namespace name or "_all"
resource-type: plural names separated by "," or "all" (like kubectl get all)
https://kube-web-view.readthedocs.io/
63
QUERY PARAMETERS FOR LIST VIEW
sort: column name to sort by, optionally with ":desc"
labelcols: additional label columns (comma separated) or "*"
selector: label selector (like kubectl -l), will be passed to Kubernetes API
filter: post-processing filter, either a simple string, Column=Value or
Column!=Value
hidecols: hide certain columns
customcols: custom columns using JMESPath
limit: number of rows to show
https://kube-web-view.readthedocs.io/en/latest/features.html#listing-resources
64
CUSTOMIZATION
Nearly all aspects can be customized for your org via CLI options:
• External Links (monitoring dashboards, ..)
• Default Label and Custom Columns
• Sidebar, HTML templates
• OAuth2 integration
kube-web-view.readthedocs.io/en/latest/customization.html
65
LINKING FROM DEPLOYMENT STATUS
66
KUBE-WEB-VIEW.DEMO.J-SERV.DE
67
TESTING WITH PYTEST-KIND AND PURE HTML
• Pykube
• aiohttp
• pytest-kind
• Jinja2 templates
68
KUBERNETES + PYTHON?
• Pykube
• asyncio / aiohttp
• pytest-kind
• Jinja2 templates
codeberg.org/hjacobs/kube-web-view/
69
KUBERNETES RESOURCE REPORT
github.com/hjacobs/kube-resource-report
https://github.com/hjacobs/kube-ops-view
https://github.com/hjacobs/kube-ops-view
72
KUBERNETES + PYTHON =
github.com/hjacobs
73
KUBERNETES + PYTHON =
code examples from this talk can be found in
codeberg.org/hjacobs/kubernetes-and-python
74
ZALANDO OPEN SOURCE
Kubernetes on AWS
github.com/zalando-incubator/kubernetes-on-aws
AWS ALB Ingress controller
github.com/zalando-incubator/kube-ingress-aws-controller
External DNS
github.com/kubernetes-incubator/external-dns
Postgres Operator
github.com/zalando/postgres-operator
Elasticsearch Operator
github.com/zalando-incubator/es-operator
Kubernetes Metrics Adapter
github.com/zalando-incubator/kube-metrics-adapter
QUESTIONS?
HENNING JACOBS
henning@zalando.de
@try_except_
Illustrations by @01k

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