1 개요[ | ]
- 카타코더 Kubernetes - Networking Introduction
2 Cluster IP[ | ]
master:~$ cat clusterip.yaml
apiVersion: v1
kind: Service
metadata:
name: webapp1-clusterip-svc
labels:
app: webapp1-clusterip
spec:
ports:
- port: 80
selector:
app: webapp1-clusterip
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: webapp1-clusterip-deployment
spec:
replicas: 2
template:
metadata:
labels:
app: webapp1-clusterip
spec:
containers:
- name: webapp1-clusterip-pod
image: katacoda/docker-http-server:latest
ports:
- containerPort: 80
---
master:~$ kubectl apply -f clusterip.yaml
service/webapp1-clusterip-svc created
deployment.extensions/webapp1-clusterip-deployment created
master:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
webapp1-clusterip-deployment-7fd8b9674b-b9dns 1/1 Running 0 22s
webapp1-clusterip-deployment-7fd8b9674b-zdqbq 1/1 Running 0 22s
master:~$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 1m
webapp1-clusterip-svc ClusterIP 10.98.44.183 <none> 80/TCP 31s
master:~$ kubectl describe svc/webapp1-clusterip-svc
Name: webapp1-clusterip-svc
Namespace: default
Labels: app=webapp1-clusterip
Annotations: kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"app":"webapp1-clusterip"},"name":"webapp1-clusterip-svc","namespace":"defau...
Selector: app=webapp1-clusterip
Type: ClusterIP
IP: 10.98.44.183
Port: <unset> 80/TCP
TargetPort: 80/TCP
Endpoints: 10.32.0.2:80,10.32.0.3:80
Session Affinity: None
Events: <none>
master:~$ export CLUSTER_IP=$(kubectl get services/webapp1-clusterip-svc-o go-template='{{(index .spec.clusterIP)}}')
master:~$ echo CLUSTER_IP=$CLUSTER_IP
CLUSTER_IP=10.98.44.183
master:~$ curl $CLUSTER_IP:80
<h1>This request was processed by host: webapp1-clusterip-deployment-7fd8b9674b-b9dns</h1>
master:~$ curl $CLUSTER_IP:80
<h1>This request was processed by host: webapp1-clusterip-deployment-7fd8b9674b-b9dns</h1>
master:~$ curl $CLUSTER_IP:80
<h1>This request was processed by host: webapp1-clusterip-deployment-7fd8b9674b-b9dns</h1>
master:~$ curl $CLUSTER_IP:80
<h1>This request was processed by host: webapp1-clusterip-deployment-7fd8b9674b-zdqbq</h1>
master:~$ curl $CLUSTER_IP:80
<h1>This request was processed by host: webapp1-clusterip-deployment-7fd8b9674b-zdqbq</h1>
master:~$ curl $CLUSTER_IP:80
<h1>This request was processed by host: webapp1-clusterip-deployment-7fd8b9674b-zdqbq</h1>
master:~$ curl $CLUSTER_IP:80
<h1>This request was processed by host: webapp1-clusterip-deployment-7fd8b9674b-b9dns</h1>
3 Target Port[ | ]
master:~$ cat clusterip-target.yaml
apiVersion: v1
kind: Service
metadata:
name: webapp1-clusterip-targetport-svc
labels:
app: webapp1-clusterip-targetport
spec:
ports:
- port: 8080
targetPort: 80
selector:
app: webapp1-clusterip-targetport
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: webapp1-clusterip-targetport-deployment
spec:
replicas: 2
template:
metadata:
labels:
app: webapp1-clusterip-targetport
spec:
containers:
- name: webapp1-clusterip-targetport-pod
image: katacoda/docker-http-server:latest
ports:
- containerPort: 80
---
master:~$ kubectl apply -f clusterip-target.yaml
service/webapp1-clusterip-targetport-svc created
deployment.extensions/webapp1-clusterip-targetport-deployment created
master:~$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 3m
webapp1-clusterip-svc ClusterIP 10.98.44.183 <none> 80/TCP 3m
webapp1-clusterip-targetport-svc ClusterIP 10.105.237.185 <none> 8080/TCP 16s
master:~$ kubectl describe svc/webapp1-clusterip-targetport-svc
Name: webapp1-clusterip-targetport-svc
Namespace: default
Labels: app=webapp1-clusterip-targetport
Annotations: kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"app":"webapp1-clusterip-targetport"},"name":"webapp1-clusterip-targetport-s...
Selector: app=webapp1-clusterip-targetport
Type: ClusterIP
IP: 10.105.237.185
Port: <unset> 8080/TCP
TargetPort: 80/TCP
Endpoints: 10.32.0.6:80,10.32.0.7:80
Session Affinity: None
Events: <none>
master:~$ export CLUSTER_IP=$(kubectl get services/webapp1-clusterip-targetport-svc -o go-template='{{(index .spec.clusterIP)}}')
master:~$ echo CLUSTER_IP=$CLUSTER_IP
CLUSTER_IP=10.105.237.185
master:~$ curl $CLUSTER_IP:8080
<h1>This request was processed by host: webapp1-clusterip-targetport-deployment-ffdbb7558-pdc9j</h1>
master:~$ curl $CLUSTER_IP:8080
<h1>This request was processed by host: webapp1-clusterip-targetport-deployment-ffdbb7558-pdc9j</h1>
master:~$ curl $CLUSTER_IP:8080
<h1>This request was processed by host: webapp1-clusterip-targetport-deployment-ffdbb7558-wtvs7</h1>
master:~$ curl $CLUSTER_IP:8080
<h1>This request was processed by host: webapp1-clusterip-targetport-deployment-ffdbb7558-wtvs7</h1>
master:~$ curl $CLUSTER_IP:8080
<h1>This request was processed by host: webapp1-clusterip-targetport-deployment-ffdbb7558-pdc9j</h1>
4 NodePort[ | ]
master:~$ cat nodeport.yaml
apiVersion: v1
kind: Service
metadata:
name: webapp1-nodeport-svc
labels:
app: webapp1-nodeport
spec:
type: NodePort
ports:
- port: 80
nodePort: 30080
selector:
app: webapp1-nodeport
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: webapp1-nodeport-deployment
spec:
replicas: 2
template:
metadata:
labels:
app: webapp1-nodeport
spec:
containers:
- name: webapp1-nodeport-pod
image: katacoda/docker-http-server:latest
ports:
- containerPort: 80
---
master:~$ kubectl apply -f nodeport.yaml
service/webapp1-nodeport-svc created
deployment.extensions/webapp1-nodeport-deployment created
master:~$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 6m
webapp1-clusterip-svc ClusterIP 10.98.44.183 <none> 80/TCP 6m
webapp1-clusterip-targetport-svc ClusterIP 10.105.237.185 <none> 8080/TCP 3m
webapp1-nodeport-svc NodePort 10.97.69.120 <none> 80:30080/TCP 20s
master:~$ kubectl describe svc/webapp1-nodeport-svc
Name: webapp1-nodeport-svc
Namespace: default
Labels: app=webapp1-nodeport
Annotations: kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"app":"webapp1-nodeport"},"name":"webapp1-nodeport-svc","namespace":"default...
Selector: app=webapp1-nodeport
Type: NodePort
IP: 10.97.69.120
Port: <unset> 80/TCP
TargetPort: 80/TCP
NodePort: <unset> 30080/TCP
Endpoints: 10.32.0.8:80,10.32.0.9:80
Session Affinity: None
External Traffic Policy: Cluster
Events: <none>
master:~$ curl 172.17.0.19:30080
<h1>This request was processed by host: webapp1-nodeport-deployment-785989576b-j5fc6</h1>
master:~$ curl 172.17.0.19:30080
<h1>This request was processed by host: webapp1-nodeport-deployment-785989576b-j5fc6</h1>
master:~$ curl 172.17.0.19:30080
<h1>This request was processed by host: webapp1-nodeport-deployment-785989576b-gcwgb</h1>
master:~$ curl 172.17.0.19:30080
<h1>This request was processed by host: webapp1-nodeport-deployment-785989576b-j5fc6</h1>
5 External IPs[ | ]
master:~$ cat externalip.yaml
apiVersion: v1
kind: Service
metadata:
name: webapp1-externalip-svc
labels:
app: webapp1-externalip
spec:
ports:
- port: 80
externalIPs:
- HOSTIP
selector:
app: webapp1-externalip
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: webapp1-externalip-deployment
spec:
replicas: 2
template:
metadata:
labels:
app: webapp1-externalip
spec:
containers:
- name: webapp1-externalip-pod
image: katacoda/docker-http-server:latest
ports:
- containerPort: 80
---
master:~$ sed -i 's/HOSTIP/172.17.0.19/g' externalip.yaml
master:~$ kubectl apply -f externalip.yaml
service/webapp1-externalip-svc created
deployment.extensions/webapp1-externalip-deployment created
master:~$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 9m
webapp1-clusterip-svc ClusterIP 10.98.44.183 <none> 80/TCP 8m
webapp1-clusterip-targetport-svc ClusterIP 10.105.237.185 <none> 8080/TCP 6m
webapp1-externalip-svc ClusterIP 10.109.41.233 172.17.0.19 80/TCP 21s
webapp1-nodeport-svc NodePort 10.97.69.120 <none> 80:30080/TCP 2m
master:~$ kubectl describe svc/webapp1-externalip-svc
Name: webapp1-externalip-svc
Namespace: default
Labels: app=webapp1-externalip
Annotations: kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"app":"webapp1-externalip"},"name":"webapp1-externalip-svc","namespace":"def...
Selector: app=webapp1-externalip
Type: ClusterIP
IP: 10.109.41.233
External IPs: 172.17.0.19
Port: <unset> 80/TCP
TargetPort: 80/TCP
Endpoints: 10.32.0.10:80,10.32.0.11:80
Session Affinity: None
Events: <none>
master:~$ curl 172.17.0.19
<h1>This request was processed by host: webapp1-externalip-deployment-bdf9688c4-chw4b</h1>
master:~$ curl 172.17.0.19
<h1>This request was processed by host: webapp1-externalip-deployment-bdf9688c4-8p4fg</h1>
master:~$ curl 172.17.0.19
<h1>This request was processed by host: webapp1-externalip-deployment-bdf9688c4-chw4b</h1>
6 Load Balancer[ | ]
master:~$ cat cloudprovider.yaml
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
name: kube-keepalived-vip
namespace: kube-system
spec:
template:
metadata:
labels:
name: kube-keepalived-vip
spec:
hostNetwork: true
containers:
- image: gcr.io/google_containers/kube-keepalived-vip:0.9
name: kube-keepalived-vip
imagePullPolicy: Always
securityContext:
privileged: true
volumeMounts:
- mountPath: /lib/modules
name: modules
readOnly: true
- mountPath: /dev
name: dev
# use downward API
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
# to use unicast
args:
- --services-configmap=kube-system/vip-configmap
# unicast uses the ip of the nodes instead of multicast
# this is useful if running in cloud providers (like AWS)
#- --use-unicast=true
volumes:
- name: modules
hostPath:
path: /lib/modules
- name: dev
hostPath:
path: /dev
nodeSelector:
# type: worker # adjust this to match your worker nodes
---
## We also create an empty ConfigMap to hold our config
apiVersion: v1
kind: ConfigMap
metadata:
name: vip-configmap
namespace: kube-system
data:
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
labels:
app: keepalived-cloud-provider
name: keepalived-cloud-provider
namespace: kube-system
spec:
replicas: 1
revisionHistoryLimit: 2
selector:
matchLabels:
app: keepalived-cloud-provider
strategy:
type: RollingUpdate
template:
metadata:
annotations:
scheduler.alpha.kubernetes.io/critical-pod: ""
scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
labels:
app: keepalived-cloud-provider
spec:
containers:
- name: keepalived-cloud-provider
image: quay.io/munnerz/keepalived-cloud-provider:0.0.1
imagePullPolicy: IfNotPresent
env:
- name: KEEPALIVED_NAMESPACE
value: kube-system
- name: KEEPALIVED_CONFIG_MAP
value: vip-configmap
- name: KEEPALIVED_SERVICE_CIDR
value: 10.10.0.0/26 # pick a CIDR that is explicitly reservedfor keepalived
volumeMounts:
- name: certs
mountPath: /etc/ssl/certs
resources:
requests:
cpu: 200m
livenessProbe:
httpGet:
path: /healthz
port: 10252
host: 127.0.0.1
initialDelaySeconds: 15
timeoutSeconds: 15
failureThreshold: 8
volumes:
- name: certs
hostPath:
path: /etc/ssl/certs
master:~$ kubectl apply -f cloudprovider.yaml
daemonset.extensions/kube-keepalived-vip created
configmap/vip-configmap created
deployment.apps/keepalived-cloud-provider created
master:~$ kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-78fcdf6894-d4cwq 1/1 Running 0 11m
coredns-78fcdf6894-j2wc5 1/1 Running 0 11m
etcd-master 1/1 Running 0 10m
keepalived-cloud-provider-fb7465d76-jxckr 1/1 Running 0 9s
kube-apiserver-master 1/1 Running 0 10m
kube-controller-manager-master 1/1 Running 0 9m
kube-keepalived-vip-2rdt2 1/1 Running 0 9s
kube-proxy-rpmm5 1/1 Running 0 11m
kube-scheduler-master 1/1 Running 0 10m
weave-net-6ppzr 2/2 Running 1 11m
master:~$ cat loadbalancer.yaml
apiVersion: v1
kind: Service
metadata:
name: webapp1-loadbalancer-svc
labels:
app: webapp1-loadbalancer
spec:
type: LoadBalancer
ports:
- port: 80
selector:
app: webapp1-loadbalancer
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: webapp1-loadbalancer-deployment
spec:
replicas: 2
template:
metadata:
labels:
app: webapp1-loadbalancer
spec:
containers:
- name: webapp1-loadbalancer-pod
image: katacoda/docker-http-server:latest
ports:
- containerPort: 80
---
master:~$ kubectl apply -f loadbalancer.yaml
service/webapp1-loadbalancer-svc created
deployment.extensions/webapp1-loadbalancer-deployment created
master:~$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 12m
webapp1-clusterip-svc ClusterIP 10.98.44.183 <none> 80/TCP 11m
webapp1-clusterip-targetport-svc ClusterIP 10.105.237.185 <none> 8080/TCP 8m
webapp1-externalip-svc ClusterIP 10.109.41.233 172.17.0.19 80/TCP 2m
webapp1-loadbalancer-svc LoadBalancer 10.110.83.174 10.10.0.1 80:31235/TCP 8s
webapp1-nodeport-svc NodePort 10.97.69.120 <none> 80:30080/TCP 5m
master:~$ kubectl describe svc/webapp1-loadbalancer-svc
Name: webapp1-loadbalancer-svc
Namespace: default
Labels: app=webapp1-loadbalancer
Annotations: kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"app":"webapp1-loadbalancer"},"name":"webapp1-loadbalancer-svc","namespace":...
Selector: app=webapp1-loadbalancer
Type: LoadBalancer
IP: 10.110.83.174
LoadBalancer Ingress: 10.10.0.1
Port: <unset> 80/TCP
TargetPort: 80/TCP
NodePort: <unset> 31235/TCP
Endpoints: 10.32.0.13:80,10.32.0.14:80
Session Affinity: None
External Traffic Policy: Cluster
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal CreatingLoadBalancer 19s service-controller Creating loadbalancer
Normal CreatedLoadBalancer 19s service-controller Created load balancer
master:~$ export LoadBalancerIP=$(kubectl get services/webapp1-loadbalancer-svc -o go-template='{{(index .status.loadBalancer.ingress 0).ip}}')
master:~$ echo LoadBalancerIP=$LoadBalancerIP
LoadBalancerIP=10.10.0.1
master:~$ curl $LoadBalancerIP
<h1>This request was processed by host: webapp1-loadbalancer-deployment-69b9f76fd6-zwgvz</h1>
master:~$ curl $LoadBalancerIP
<h1>This request was processed by host: webapp1-loadbalancer-deployment-69b9f76fd6-wr847</h1>
master:~$ curl $LoadBalancerIP
<h1>This request was processed by host: webapp1-loadbalancer-deployment-69b9f76fd6-zwgvz</h1>
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