k8s版本
[root@k8s-master ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.0", GitCommit:"70132b0f130acc0bed193d9ba59dd186f0e634cf", GitTreeState:"clean", BuildDate:"2019-12-07T21:20:10Z", GoVersion:"go1.13.4", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.0", GitCommit:"70132b0f130acc0bed193d9ba59dd186f0e634cf", GitTreeState:"clean", BuildDate:"2019-12-07T21:12:17Z", GoVersion:"go1.13.4", Compiler:"gc", Platform:"linux/amd64"}
一、yaml文件编写
mysql-db.yaml
apiVersion: v1
kind: Service
metadata:
name: wordpress-mysql
labels:
app: wordpress
spec:
ports:
- port: 3306
selector:
app: wordpress
tier: mysql
clusterIP: None
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-pv-claim
labels:
app: wordpress
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 5Gi
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
name: wordpress-mysql
labels:
app: wordpress
spec:
selector:
matchLabels:
app: wordpress
tier: mysql
strategy:
type: Recreate
template:
metadata:
labels:
app: wordpress
tier: mysql
spec:
containers:
- image: mysql:5.6
name: mysql
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-pass
key: password
ports:
- containerPort: 3306
name: mysql
volumeMounts:
- name: mysql-persistent-storage
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
persistentVolumeClaim:
claimName: mysql-pv-claim
- 创建数据库密码
kubectl create secret generic mysql-pass --from-literal='password=123456'
- 创建足够的PV
pv.yaml
kind: PersistentVolume
apiVersion: v1
metadata:
name: wordpress-mysql-pv-volume
labels:
type: local
spec:
capacity:
storage: 5Gi # 根据你创建的pvc大小设置
accessModes:
- ReadWriteOnce
hostPath:
path: "/data/pv/wordpress"
执行创建
kubectl apply -f pv.yaml
- 创建数据库pod
kubectl apply -f mysql-db.yaml
编写wordpress.yaml
wordpress.yaml
apiVersion: v1
kind: Service
metadata:
name: wordpress
labels:
app: wordpress
spec:
ports:
- port: 80
selector:
app: wordpress
tier: frontend
type: NodePort
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: wp-pv-claim
labels:
app: wordpress
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 5Gi
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
name: wordpress
labels:
app: wordpress
spec:
selector:
matchLabels:
app: wordpress
tier: frontend
strategy:
type: Recreate
template:
metadata:
labels:
app: wordpress
tier: frontend
spec:
containers:
- image: wordpress:4.8-apache
name: wordpress
env:
- name: WORDPRESS_DB_HOST
value: wordpress-mysql
- name: WORDPRESS_DB_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-pass # 对应创建的secretw
key: password
ports:
- containerPort: 80
name: wordpress
volumeMounts:
- name: wordpress-persistent-storage
mountPath: /var/www/html
volumes:
- name: wordpress-persistent-storage
persistentVolumeClaim:
claimName: wp-pv-claim
- 创建wordpress pod
kubectl apply -f wordpress.yaml
- 检查运行情况
kubectl get pod --all-namespaces
[root@k8s-master ~]# kubectl get pod --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
default wordpress-578744754c-bxq4v 1/1 Running 3 166m
default wordpress-mysql-5b697dbbfc-vm9b4 1/1 Running 2 3h21m
kube-system calico-kube-controllers-7cc97544d-z9mxz 1/1 Running 14 7d20h
kube-system calico-node-7mc7r 1/1 Running 0 7d2h
kube-system calico-node-dpkwx 1/1 Running 10 7d3h
kube-system calico-node-zqkd5 1/1 Running 14 7d20h
kube-system coredns-674df8b8bd-g662l 1/1 Running 14 7d20h
kube-system coredns-674df8b8bd-rv7lr 1/1 Running 15 7d20h
kube-system etcd-k8s-master 1/1 Running 15 7d20h
kube-system kube-apiserver-k8s-master 1/1 Running 17 7d20h
kube-system kube-controller-manager-k8s-master 1/1 Running 49 7d20h
kube-system kube-proxy-h7mh4 1/1 Running 15 7d20h
kube-system kube-proxy-sd5cz 1/1 Running 0 7d2h
kube-system kube-proxy-vxm62 1/1 Running 7 7d3h
kube-system kube-scheduler-k8s-master 1/1 Running 41 7d20h
kubernetes-dashboard dashboard-metrics-scraper-7b8b58dc8b-gtq65 1/1 Running 4 4d23h
kubernetes-dashboard kubernetes-dashboard-5f5f847d57-ljngx 1/1 Running 4 4d20h
查看services端口
kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 7d20h
wordpress NodePort 10.96.183.43 <none> 80:30593/TCP 3h6m
wordpress-mysql ClusterIP None <none> 3306/TCP 3h41m
访问 matster节点IP:30593
image.png
问题排查
- 创建pod失败
describe命令执行
kubectl describe pod xxx
问题信息pvc一直处于Pending
kubectl describe pvc
no persistent volumes available for this claim and no storage class is set
Mounted By: <none>
实际为没有合适的pv，创建合适的pv即可。
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