How Kubernetes works

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What is Kubernetes?

,VCFSOFUFT Ӝ ؝ٝذشؔ٦؛أزٖ٦ءّٝخ٦ٕ ؝ٝذشךꂁ⪒ծ鏣㹀ծ盖椚׾遤ֲ Ӝ ĜĦĔėģğήĥęςؘٔءٍ铂ד乼菭㡦 Ӝ (PPHMFך爡ⰻءأذيַ׵؎ٝأػ؎،ׁ׸׋ “Kubernetes
is open source—a contrast to Borg and Omega,  which were developed as purely Google-internal systems. “ Borg, Omega, and Kubernetes  https://research.google.com/pubs/pub44843.html

Google - Site Reliability Engineering

https://twitter.com/brendandburns/status/585479466648018944

➭ךفٓحزؿؓ٦يהך嫰鯰 Ӝ *OGSBTUSVDUVSFBTB 4FSWJDF Ӝ 7. ر؍أؙ طحز ٙ٦ؙ
,VCFSOFUFT Ӝ $POUBJOFSBTB4FSWJDF Ӝ ؝ٝذشך盖椚ծ㹋遤 Ӝ ֮׵ײ׷،فٔ؛٦ءّٝ $MPVE'PVOESZ Ӝ 1MBUGPSNBTB4FSWJDF Ӝ ؝٦سַ׵رفٗ؎ Ӝ )551ծ"1*ծ8FC 0QFO4UBDL

Why Kubernetes?

,VCFSOFUFTכؔ٦فٝד֮׷ Ӝ ؔ٦فٝا٦أاؿزؐؑ، HJUIVCDPNLVCFSOFUFTLVCFSOFUFT "QBDIF-JDFOTF Ӝ ؔ٦فٝرؠ؎ٝ HJUIVCDPNLVCFSOFUFTDPNNVOJUZ Ӝ
ؔ٦فٝ؝ىُصذ؍ 4QFDJBM*OUFSFTU(SPVQT 4*(T 4MBDL 4UBDL0WFSPX Ⰻ⚅歲ד⟃♳ךى٦ز،حف Ӝ $MPVE/BUJWF$PNQVUJOH'PVOEBUJPO $/$'

$VSSFOU1SPKFDUT Kubernetes  Orchestration Prometheus  Monitoring OpenTracing  Tracing ﬂutentd  Logging Linkerd 
Service Mesh GRPC  Remote Procedure Call CoreDNS  Service Discovery Containerd  Container Runtime rkt  Container Runtime CNI  Networking https://www.cncf.io/projects/

https://www.cncf.io/about/members/ 1MBUJOVN.FNCFST

1MBUJOVN.FNCFST https://www.cncf.io/about/members/

,VCFSOFUFTכه٦ةـٕד֮׷ Ӝ DMPVEQSPWJEFS --# ـٗحؙأزٖ٦آזוך乼⡲׾䬄韋⻉ ($1 "84 "[VSF 0QFO4UBDL 
Ӝ $/* $POUBJOFS/FUXPSL*OUFSGBDF $BMJDP 'MBOOFM 0QFOW4XJUDI 8FBWF  Ӝ $POUBJOFS3VOUJNF %PDLFS SLU DSJP

,VCFSOFUFTכ䧭ꞿ׃גְ׷ Kubernetes Docker Swarm Apache Mesos All Time Statistics
Contributors 1,473 201 288 Commits 49,619 3,331 24,308 12 Month Statistics Contributors 756 66 155 Commits 19,223 567 7,946 https://www.openhub.net/p/_compare?project_0=Kubernetes&project_1=docker+swarm&project_2=Apache+Mesos As of 17/06/12

How Kubernetes works

،٦ؗذؙثٍ CLI API UI Master Node 1 Node “n”

؝،؝ٝإفز Ӝ 1PET Ӝ 3FQMJDB4FUT Ӝ %FQMPZNFOUT Ӝ 4FSWJDFT

1PET Ӝ 醱侧ך؝ٝذشה  醱侧ךنُٔ٦ي Ӝ رفٗ؎ך剑㼭⽃⡘ Ӝ *1QFS1PE 1PE
Volume Web Server Agent

1PET Ӝ 醱侧ך؝ٝذشה  醱侧ךنُٔ٦ي Ӝ رفٗ؎ך剑㼭⽃⡘ Ӝ *1QFS1PE apiVersion:
v1 kind: Pod metadata: name: nginx spec: containers: - name: nginx image: nginx:1.13.3 ports: - containerPort: 80

3FQMJDB4FUT Ӝ /⦐ך1PEָ㹋遤ׁ׸גְ׷朐䡾׾⥂א 3FQMJDB4FU Replicas: 2 Selector: app=web Pod 
Template 1PE app web 1PE app web

Template 1PE app web

Template 1PE app web 1PE app web

3FQMJDB4FUT Ӝ /⦐ך1PEָ  㹋遤ׁ׸גְ׷朐䡾׾⥂א apiVersion: extensions/v1beta1 kind: ReplicaSet metadata:
name: nginx spec: replicas: 2 selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.13.3 ports: - containerPort: 80

%FQMPZNFOUT %FQMPZNFOU Replicas: 2 Selector: app=web  image: app:v1 Pod 
Template 1PE app:v1 1PE app:v1 34 Replicas: 2 app:v1 Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ

Template 1PE app:v1 1PE app:v1 34 Replicas: 2 app:v1 Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ

Template 1PE app:v1 1PE app:v1 34 34 Replicas: 2 app:v1 Replicas: 1 app:v2 Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ

Template 1PE app:v1 1PE app:v1 34 34 Replicas: 2 app:v1 1PE app:v2 Replicas: 1 app:v2 Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ

Template 1PE app:v1 1PE app:v1 34 34 Replicas: 1 app:v1 1PE app:v2 Replicas: 1 app:v2 Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ

Template 1PE app:v1 34 34 Replicas: 1 app:v1 1PE app:v2 Replicas: 1 app:v2 Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ

Template 1PE app:v1 34 34 Replicas: 2 app:v2 Replicas: 1 app:v1 1PE app:v2 Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ

Template 1PE app:v1 1PE app:v2 34 34 Replicas: 2 app:v2 Replicas: 1 app:v1 1PE app:v2 Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ

%FQMPZNFOUT Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ %FQMPZNFOU Replicas: 2 Selector:
app=web  image: app:v2 Pod  Template 1PE app:v1 1PE app:v2 34 34 Replicas: 2 app:v2 Replicas: 0 app:v1 1PE app:v2

%FQMPZNFOUT Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ %FQMPZNFOU Replicas: 2 Selector:
app=web  image: app:v2 Pod  Template 1PE app:v2 34 34 Replicas: 2 app:v2 Replicas: 0 app:v1 1PE app:v2

%FQMPZNFOUT Ӝ ٗ٦ؚٔٝ،حفر٦ز Ӝ ٗ٦ٕغحؙ apiVersion: apps/v1beta1 kind: Deployment
metadata: name: nginx spec: replicas: 2 selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.13.3 ports: - containerPort: 80

4FSWJDFT Ӝ ⟎䟝*1הه٦ز Ӝ ٓكٕإؙٖةח״׷  1PEךؚٕ٦ؾؚٝ Ӝ ؟٦ؽأة؎ف $MVTUFS*1 /PEF1PSU
-PBE#BMBODFS  1PE app web 1PE app web 3FQMJDB4FU 4FSWJDF VIP: 10.0.0.249 Selector: app=web

4FSWJDFT Ӝ ⟎䟝*1הه٦ز Ӝ ٓكٕإؙٖةח״׷  1PEךؚٕ٦ؾؚٝ Ӝ ؟٦ؽأة؎ف $MVTUFS*1 /PEF1PSU
-PBE#BMBODFS  apiVersion: v1 kind: Service metadata: name: nginx spec: type: ClusterIP selector: app: nginx ports: - protocol: TCP port: 80 targetPort: 80

*OHSFTT Ӝ -頾蚚ⴓ侔 Ӝ غ٦ثٍٕمأز Ӝ ػأח״׷䮶׶ⴓֽ Ӝ 5-4穄畭
4FSWJDFGPP 4FSWJDFCBS *OHSFTT /foo /bar example.com

*OHSFTT Ӝ -頾蚚ⴓ侔 Ӝ غ٦ثٍٕمأز Ӝ ػأח״׷䮶׶ⴓֽ Ӝ 5-4穄畭
apiVersion: extensions/v1beta1 kind: Ingress metadata: name: example-com spec: rules: - host: example.com http: paths: - path: /foo backend: serviceName: foo servicePort: 80 - path: /bar backend: serviceName: bar servicePort: 80

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4UPSBHF$MBTT宕竲نُٔ٦ي Ӝ 4UBUFGVM4FUTأذ٦زؿٕ،فٔ؛٦ءّٝ Ӝ +PCTٙٝءّحزآّـ Ӝ $SPO+PCآّـך㹀劍㹋遤 Ӝ %BFNPO4FUTⰋגךظ٦سד1PE׾㹋遤 Ӝ )PMJ[POUBM1PE"VUP4DBMFSؔ٦زأ؛٦ٕ

،٦ؗذؙثٍ CLI API UI Master Node 1 Node “n”

،٦ؗذؙثٍ $POUSPMMFS  .BOBHFS FUDE 4DIFEVMFS BQJTFSWFS CLI API UI
Master Node 1 Node “n” $POUBJOFS  3VOUJNF LVCFMFU LVCFMFU $POUBJOFS  3VOUJNF

FUDE㈓♧ךر٦ةأز، $POUSPMMFS  .BOBHFS FUDE 4DIFEVMFS BQJTFSWFS Master Ӝ $1㘗ךⴓ侔ؗ٦غُٔ٦أز،
Ӝ أذ٦زכⰋגFUDEח⥂㶷ׁ׸׷ Ӝ ؐؓحث׾؟ه٦ز׃גֶ׶ծ  أذ٦زך㢌刿כ׋׌׍ח➭ך  ؝ٝه٦طٝزח鸐濼ׁ׸׷ Ӝ IUUQHJUIVCDPNDPSFPTFUDE CLI API UI

BQJTFSWFS3&45 $36% 钠鏾钠〳 $POUSPMMFS  .BOBHFS FUDE 4DIFEVMFS BQJTFSWFS Master
Ӝ 3&45Ⳣ椚הغٔر٦ءّٝ Ӝ 钠鏾钠〳 Ӝ ㈓♧FUDEחر٦ة׾剅ֹ鴥׬ Ӝ ؽآطأٗآحؙכ㹋鄲ׁ׸גְזְ CLI API UI

4DIFEVMFS1PEךأ؛آُ٦ؚٔٝ $POUSPMMFS  .BOBHFS FUDE 4DIFEVMFS BQJTFSWFS Master Ӝ 1PEךٔا٦أ銲実זו罋䣁׃ג 
黝ⴖז/PEFחأ؛آُ٦ؚׅٔٝ׷ Ӝ أ؛آُ٦ٕׅ׷/PEF׾  䭷㹀ׅ׷ֿה׮דֹ׷ resources: requests: memory: "64Mi" cpu: "250m" CLI API UI

$POUSPMMFS.BOBHFSؽآطأٗآحؙ $POUSPMMFS  .BOBHFS FUDE 4DIFEVMFS BQJTFSWFS Master Ӝ 3FQMJDB4FUT
4FSWJDFTזוծٔا٦أך  ؽآطأٗآحָؙ㹋鄲ׁ׸גְ׷ CLI API UI

LVCFMFU $POUBJOFS  3VOUJNF Node $POUBJOFS3VOUJNF BQJTFSWFS Master Ӝ ؝ٝذش؎ً٦آך《䖤ה㹋遤
Ӝ $3*$POUBJOFS3VOUJNF*OUFSGBDF %PDLFS SLU DSJP

LVCFMFU $POUBJOFS  3VOUJNF Node LVCFMFU BQJTFSWFS Master Ӝ /PEFח䌢꽎ׅ׷ؒ٦آؑٝز
Ӝ BQJTFSWFS׾ؐؓحث׃גծ荈魦ך  /PEFח1PEָأ؛آُ٦ׁٕ׸׷ה  ؝ٝذش؎ً٦آך《䖤ծ㹋遤׾遤ֲ Ӝ ؝ٝذشך朐䡾ח䘔ׄגBQJTFSWFS׾  鸐ׄג1PEךأذ٦ز׾刿倜ׅ׷

)PXB1PEJTTDIFEVMFE Core Kubernetes: Jazz Improv over Orchestration

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Ӝ #PSH 0NFHB BOE,VCFSOFUFT

5IBOLT Ӝ 4MJEF CJUMZIPXLTXPSLT Ӝ 2VFTUJPOT ,B[VLJ4VEBLTVEB![MBCDPKQ !TVQFSCSPUIFST

How Kubernetes works

How Kubernetes works

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