无法连接到Kubernetes中的蟑螂舱
我正在开发一个带有web服务和持久层的简单web应用程序。Web持久层是Cockroach db。我正在尝试使用单个命令部署我的应用程序:无法连接到Kubernetes中的蟑螂舱,kubernetes,deployment,yaml,kubectl,cockroachdb,Kubernetes,Deployment,Yaml,Kubectl,Cockroachdb,我正在开发一个带有web服务和持久层的简单web应用程序。Web持久层是Cockroach db。我正在尝试使用单个命令部署我的应用程序: kubectl apply -f my-app.yaml 应用程序已成功部署。但是,当后端必须在db中存储某些内容时,会出现以下错误: dial tcp: lookup web-service-cockroach on 192.168.65.1:53: no such host postgresql://root@web-service-db:26257
kubectl apply -f my-app.yaml
应用程序已成功部署。但是,当后端必须在db中存储某些内容时,会出现以下错误:
dial tcp: lookup web-service-cockroach on 192.168.65.1:53: no such host
postgresql://root@web-service-db:26257/defaultdb?sslmode=disable
当我启动我的应用程序时,我向cockroach db提供以下连接字符串,连接成功,但当我尝试在db中存储某些内容时,会出现上述错误:
dial tcp: lookup web-service-cockroach on 192.168.65.1:53: no such host
postgresql://root@web-service-db:26257/defaultdb?sslmode=disable
由于某些原因,web pod无法与db pod进行通信。我的整个配置是:
# Service for web application
apiVersion: v1
kind: Service
metadata:
name: web-service
spec:
selector:
app: web-service
type: NodePort
ports:
- protocol: TCP
port: 8080
targetPort: http
nodePort: 30103
externalIPs:
- 192.168.1.9 # < - my local ip
---
# Deployment of web app
apiVersion: apps/v1
kind: Deployment
metadata:
name: web-service
spec:
selector:
matchLabels:
app: web-service
replicas: 1
template:
metadata:
labels:
app: web-service
spec:
hostNetwork: true
containers:
- name: web-service
image: my-local-img:latest
imagePullPolicy: IfNotPresent
ports:
- name: http
containerPort: 8080
hostPort: 8080
env:
- name: DB_CONNECT_STRING
value: "postgresql://root@web-service-db:26257/defaultdb?sslmode=disable"
---
### Kubernetes official doc PersistentVolume
apiVersion: v1
kind: PersistentVolume
metadata:
name: cockroach-pv-volume
labels:
type: local
spec:
storageClassName: manual
capacity:
storage: 10Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/tmp/my-local-volueme"
---
### Kubernetes official doc PersistentVolumeClaim
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: cockroach-pv-claim
spec:
storageClassName: manual
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 4Gi
---
# Cockroach used by web-service
apiVersion: v1
kind: Service
metadata:
name: web-service-cockroach
labels:
app: web-service-cockroach
spec:
selector:
app: web-service-cockroach
type: NodePort
ports:
- protocol: TCP
port: 26257
targetPort: 26257
nodePort: 30104
---
# Cockroach stateful set used to deploy locally
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: web-service-cockroach
spec:
serviceName: web-service-cockroach
replicas: 1
selector:
matchLabels:
app: web-service-cockroach
template:
metadata:
labels:
app: web-service-cockroach
spec:
volumes:
- name: cockroach-pv-storage
persistentVolumeClaim:
claimName: cockroach-pv-claim
containers:
- name: web-service-cockroach
image: cockroachdb/cockroach:latest
command:
- /cockroach/cockroach.sh
- start
- --insecure
volumeMounts:
- mountPath: "/tmp/my-local-volume"
name: cockroach-pv-storage
ports:
- containerPort: 26257
提前谢谢 看起来您的DNS有问题
dial tcp: lookup web-service-cockroach on 192.168.65.1:53: no such host
地址192.168.65.1
不喜欢kube dns服务ip
这可以解释,如果你在哪里使用主机网络,令人惊讶的是你这样做。
当使用hostNetwork:true
时,使用的默认dns服务器是主机使用的服务器,而不是kube dns
要解决此问题,请设置:
spec:
dnsPolicy: ClusterFirstWithHostNet
它将pod的dns服务器设置为k8s服务器
查看kubernetes文档了解更多信息。如果使用
webs服务cockroach.default.svc.cluster.local
作为数据库的DNS名称,会发生什么?这源于一个注释:我不确定你的服务的名称是什么。yaml有web服务蟑螂
,但返回的get service命令web服务蟑螂
服务名称是web服务蟑螂
。当我尝试使用以下连接字符串时:value:“p”ostgresql://web-service-cockroach.default.svc.cluster.local:26257/defaultdb?sslmode=disable“Db reports:dial tcp[::1]:26257:connect:connection Retired我已经成功地将蟑螂服务设置为连接字符串中的地址,非常感谢Ben!”!谢谢你,马特!我已经在部署规范类别下添加了dnsPolicy:ClusterFirstWithHostNet
,现在错误是:拨号tcp[::1]:26257:connect:connection-seeded
`谢谢,马特!我在添加'dnsPolicy:ClusterFirstWithHostNet'后添加了'dnsPolicy:ClusterFirstWithHostNet',我已将蟑螂的地址设置为指向蟑螂服务,并且它工作正常:)`