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Something About . . .
Operation/Maintenance
Kubernetes
Hello!
I am Tom Tsai aka smalltown
2
“
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http://bit.ly/taipei-hug
“ Kubernetes
Production
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Outline
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1.
Where is Your
Kubernetes?
Select Where Your Kubernetes is!
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Public Cloud
No
Yes
Completed
Network Infra.
General Usage
Yes
Yes
No
Shutdown
Suddenly
No Yes
No
When Should I Self-Hosted Kubernetes
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1.
High
Availability/Scalability
High Availability: Kubernetes Itself
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- Key/Value Storage - apiserver
- scheduler
- controller-manager
- kubelet
- kube-proxy
- container runtime- HA: 1, 3, 5 …
- Clustering Guide
- General HA Mode
High Availability: Application in K8S
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~$ kubectl get deployment
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
Nginx 3 3 3 3 18s
Before Talk About
Scalability . . .
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K8S Resource Request & Limit
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Ref
Scalability: Horizontal Pod Autoscaler
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Ref
Scalability: Vertical Pods Autoscaler
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Ref
Scalability: Cluster Autoscaler
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Ref
1.
Manage
Stateful Service
Stateful Service
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Manage Production Service
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Stateless Stateful
Setup
Scale Out/Up
Backup
Upgrade
Operation
CoreOS Brings
K8S Operator . . .
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What is Kubernetes Operator?
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What is Kubernetes Operator?
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An Operator is a Domain Specific Controller
Operation of Stateless Service
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kubectl
ReplicaSet
app=web, env=prod
Pod
app=web
env=prod
scale up
desired=3 count=1
kubectl
ReplicaSet
app=web, env=prod
Pod
app=web
env=prod
desired=3 count=3
Operation of Stateful Service
(Operator)
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backup
kubectl
etcd Operator
app=3.0.13
size=3
Pod
app=web
env=prod
backup-tool
interval=300s
Exist Operators
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1.
Log/Monitoring
Log Management
. . .
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Log Management: Yes, ELKF
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Log Collect
Centralised V.S. Decentralised
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System/Application
Metric Collect . . .
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Metrics: Yes, Prometheus
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Get Alert When
Service . . .
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Monitoring: Internal
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Ref
Monitor: External
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1.
Continuous Delivery
Common Resource View of K8S Application
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Deployment YAML
ConfigMap YAML Secret YAML/VaultDocker Image Tag
Service YAML
Deploy With kubectl
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Ref
The Key Man: Helm
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Deploy With Helm
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Ref
Good Old Days V.S. Kubernetes
40
GNU/Linux
ELF Binaries Config in /etc
apt, yum, etc
Chef, Puppet, Ansible
Kubernetes
Images K8S Object
Helm
Operator Framework
CI/CD Total Solution For K8S
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GitOps Patterns
42
Ref
1.
TroubleShooting
Guide
Official TroubleShooting Guide
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44
Just My Two Cents: Pod
◂ Pending
◂ Terminating
◂ CrashLoopBackOff
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Just My Two Cents: Service
◂ Endpoint is Empty
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Just My Two Cents: Node Register
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1.
Your Best
Friend: kubectl
Good Craftsmanship Depends
on Use of The Right Tools
When You Manage N Clusters N
Namespaces
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There Are Several Helper Tool For You
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Ref
1.
Kubernetes
Trends
Where Kubernetes is Going?
Kubernetes Move So Fast...
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Thanks!
Any questions?
◂

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