k8s之federation
2018-12-13 本文已影响0人
xiao_b4b1
集群信息
| 角色 | 版本 | 节点 | IP |
|---|---|---|---|
| cluster192 | kubernets 1.13.0 | master-192 | 172.30.81.192 |
| cluster194 | kubernets 1.12.3 | node-194,master-193 | 172.30.81.193,172.30.81.194 |
| federation | kubefed v1.9.0-alpha.3 ; kubectl v1.10.0 | 主集群cluster192 |
[root@master-192 kube-calico]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
* c192 cluster192 kubernetes-admin-192
c194 cluster194 kubernetes-admin-194
[root@master-192 kube-calico]# kubectl get node --context=c192
NAME STATUS ROLES AGE VERSION
master-192 Ready master 5m v1.13.0
[root@master-192 kube-calico]# kubectl get node --context=c194
NAME STATUS ROLES AGE VERSION
node-193 Ready worker 14d v1.12.3
ubuntu Ready master 14d v1.12.3
安装federation集群
1.kubefed初始化集群
[root@master-192 kube-calico]# cat /root/federation/coredns-provider.conf
[Global]
etcd-endpoints = http://172.30.81.192:2379
zones = xiaotech.com.
coredns-endpoints = 10.96.0.10:53
[root@master-192 kube-calico]# kubefed init federation \
> --host-cluster-context=c192 \
> --dns-provider="coredns" \
> --dns-zone-name="xiaotech.com." \
> --apiserver-enable-basic-auth=true \
> --apiserver-enable-token-auth=true \
> --dns-provider-config="/root/federation/coredns-provider.conf" \
> --apiserver-arg-overrides="--anonymous-auth=false,--v=4" \
> --api-server-service-type="NodePort" \
> --api-server-advertise-address="172.30.81.192" \
> --image=docker.io/xiaotech/fcp-amd64:v1.9.0-alpha.3 \
> --etcd-image=registry.cn-hangzhou.aliyuncs.com/google_containers/etcd-amd64:3.1.12 \
> --etcd-persistent-storage=false
Creating a namespace federation-system for federation system components... done
Creating federation control plane service... done
Creating federation control plane objects (credentials, persistent volume claim)...Creating federation component deployments... done
Updating kubeconfig... done
Waiting for federation control plane to come up...... done
Federation API server is running at: 172.30.81.192:32709
2.查看federation的相关信息
新建了federation-system的namespace
[root@master-192 kube-calico]# kubectl get ns
NAME STATUS AGE
default Active 8m
federation-system Active 1m
kube-public Active 8m
kube-system Active 8m
该namespace下有apiserver和controller-manager两个deploy
[root@master-192 federation]# kubectl -n federation-system get deploy
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
apiserver 1 1 1 1 8m
controller-manager 1 1 1 1 8m
新加了apiserver的service ，federation的context可以看到对应接口
[root@master-192 federation]# kubectl -n federation-system get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
apiserver NodePort 10.104.202.7 <none> 443:31082/TCP 8m
[root@master-192 federation]# kubectl config view
apiVersion: v1
clusters:
- cluster:
certificate-authority-data: REDACTED
server: https://172.30.81.192:6443
name: cluster192
- cluster:
certificate-authority-data: REDACTED
server: https://172.30.81.194:6443
name: cluster194
- cluster:
certificate-authority-data: REDACTED
server: https://172.30.81.192:31082
name: federation
查看集群信息
[root@master-192 federation]# kubectl get cluster --context=federation
No resources found.
当前集群空，我们只是把federation的控制组件部署在了cluster192中
3.federation添加集群
添加192集群
[root@master-192 kube-calico]# kubefed join cluster192 --cluster-context=c192 --host-cluster-context=c192 --context=federation
cluster "cluster192" created
[root@master-192 kube-calico]#
[root@master-192 kube-calico]#
[root@master-192 kube-calico]# kubectl get cluster --context=federation
NAME AGE
cluster192 7s
[root@master-192 kube-calico]# kubefed join cluster194 --host-cluster-context=c192 --cluster-context=c194 --context=federation
cluster "cluster194" created
[root@master-192 kube-calico]#
[root@master-192 kube-calico]#
[root@master-192 kube-calico]# kubectl get cluster --context=federation
NAME AGE
cluster192 17s
cluster194 8s
4.修改默认的context为federation
[root@master-192 kube-calico]# kubectl config use-context federation
Switched to context "federation".
[root@master-192 kube-calico]# kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
c192 cluster192 kubernetes-admin-192
c194 cluster194 kubernetes-admin-194
* federation federation federation
验证federation的使用
1.创建deploy
默认的defaut不存在，首先创建
[root@master-192 kube-calico]# kubectl create ns default
[root@master-192 kube-calico]# kubectl get ns
NAME STATUS AGE
default Active 39s
[root@master-192 kube-calico]# kubectl run nginx --image=nginx --port=80
deployment.apps "nginx" created
查看deploy在集群的分布情况,都分布到集群192上了
[root@master-192 kube-calico]# kubectl get deploy --context=c194
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 0 0 0 0 2m
[root@master-192 kube-calico]# kubectl get deploy --context=c192
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 1 1 1 1 2m
[root@master-192 kube-calico]# kubectl get deploy --context=federation
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 1 1 1 1 2m
修改deploy的replicas，再查看分布情况
[root@master-192 kube-calico]# kubectl scale --replicas=4 deploy nginx
deployment.extensions "nginx" scaled
可以看到均匀分布
[root@master-192 kube-calico]# kubectl get deploy --context=federation
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 4 4 4 3 3m
[root@master-192 kube-calico]# kubectl get deploy --context=c192
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 2 2 2 2 4m
[root@master-192 kube-calico]# kubectl get deploy --context=c194
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 2 2 2 1 4m
删除某个集群的deploy，查看如何变化
[root@master-192 kube-calico]# kubectl delete deploy nginx --context=c192
deployment.extensions "nginx" deleted
可以看到过会儿集群又会重新分布
root@master-192 kube-calico]# kubectl get deploy --context=c194
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 2 2 2 1 4m
[root@master-192 kube-calico]# kubectl get deploy --context=c192
No resources found.
[root@master-192 kube-calico]# kubectl get deploy --context=federation
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 4 2 2 1 4m
[root@master-192 kube-calico]# kubectl get deploy --context=federation
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 4 2 2 1 4m
[root@master-192 kube-calico]# kubectl get deploy --context=federation
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 4 2 2 1 4m
[root@master-192 kube-calico]# kubectl get deploy --context=federation
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 4 2 2 1 5m
[root@master-192 kube-calico]# kubectl get deploy --context=federation
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 4 4 4 1 5m
[root@master-192 kube-calico]# kubectl get deploy --context=federation
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 4 4 4 1 5m
[root@master-192 kube-calico]# kubectl get deploy --context=c192
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 3 3 3 1 20s
[root@master-192 kube-calico]# kubectl get deploy --context=c194
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 1 1 1 1 5m
[root@master-192 kube-calico]# kubectl get deploy --context=c192
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 3 3 3 3 30s
[root@master-192 kube-calico]# kubectl get deploy --context=federation
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 4 4 4 4 5m
2.创建service
[root@master-192 kube-calico]# kubectl expose deploy nginx --type=NodePort
service "nginx" exposed
[root@master-192 kube-calico]#
[root@master-192 kube-calico]#
[root@master-192 kube-calico]# kubectl get svc --context=federation
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx NodePort <none> <none> 80/TCP 9s
[root@master-192 kube-calico]# kubectl get svc --context=c192
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 36m
nginx NodePort 10.98.155.166 <none> 80:32294/TCP 14s
[root@master-192 kube-calico]# kubectl get svc --context=c194
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 14d
nginx NodePort 10.102.186.190 <none> 80:30107/TCP 19s
