08.验证集群功能
本文档使用 daemonset 验证 master 和 worker 节点是否工作正常。
注意:如果没有特殊指明,本文档的所有操作均在 zhangjun-k8s01 节点上执行,然后远程分发文件和执行命令。
检查节点状态
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
zhangjun-k8s01 Ready <none> 154m v1.14.2
zhangjun-k8s02 Ready <none> 154m v1.14.2
zhangjun-k8s03 Ready <none> 154m v1.14.2
都为 Ready 时正常。
创建测试文件
cd /opt/k8s/work
cat > nginx-ds.yml <<EOF
apiVersion: v1
kind: Service
metadata:
name: nginx-ds
labels:
app: nginx-ds
spec:
type: NodePort
selector:
app: nginx-ds
ports:
- name: http
port: 80
targetPort: 80
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
name: nginx-ds
labels:
addonmanager.kubernetes.io/mode: Reconcile
spec:
template:
metadata:
labels:
app: nginx-ds
spec:
containers:
- name: my-nginx
image: nginx:1.7.9
ports:
- containerPort: 80
EOF
执行测试
kubectl create -f nginx-ds.yml
检查各节点的 Pod IP 连通性
$ kubectl get pods -o wide|grep nginx-ds
nginx-ds-cr9n2 1/1 Running 0 2m7s 172.30.32.2 zhangjun-k8s02 <none> <none>
nginx-ds-nf7sk 1/1 Running 0 2m7s 172.30.184.2 zhangjun-k8s03 <none> <none>
nginx-ds-scpcn 1/1 Running 0 2m7s 172.30.80.2 zhangjun-k8s01 <none> <none>
可见,nginx-ds 的 Pod IP 分别是 172.30.32.2
、172.30.184.2
、172.30.80.2
,在所有 Node 上分别 ping 这三个 IP,看是否连通:
source /opt/k8s/bin/environment.sh
for node_ip in ${NODE_IPS[@]}
do
echo ">>> ${node_ip}"
ssh ${node_ip} "ping -c 1 172.30.32.2"
ssh ${node_ip} "ping -c 1 172.30.184.2"
ssh ${node_ip} "ping -c 1 172.30.80.2"
done
检查服务 IP 和端口可达性
$ kubectl get svc |grep nginx-ds
nginx-ds NodePort 10.254.13.141 <none> 80:31858/TCP 2m58s
可见:
- Service Cluster IP:10.254.13.141
- 服务端口:80
- NodePort 端口:31858
在所有 Node 上 curl Service IP:
source /opt/k8s/bin/environment.sh
for node_ip in ${NODE_IPS[@]}
do
echo ">>> ${node_ip}"
ssh ${node_ip} "curl -s 10.254.13.141"
done
预期输出 nginx 欢迎页面内容。
检查服务的 NodePort 可达性
在所有 Node 上执行:
source /opt/k8s/bin/environment.sh
for node_ip in ${NODE_IPS[@]}
do
echo ">>> ${node_ip}"
ssh ${node_ip} "curl -s ${node_ip}:31858"
done
预期输出 nginx 欢迎页面内容。