[英]OpenShift Access Mongodb Pod from another Pod
我当前正试图在OpenShift上部署一个mongodb pod,并通过mongoose从另一个node.js应用程序访问这个pod。 现在起初一切似乎都很好。 我创建了一条通往mongodb的路线,当我在浏览器中打开它时,我得到了
看起来您正在尝试通过本机驱动程序端口上的HTTP访问MongoDB。
到现在为止还挺好。 但是,当我尝试从另一个pod打开与数据库的连接时,它拒绝连接。 我正在使用OpenShift提供的用户名和密码并连接到
mongodb://[username]:[password]@[host]:[port]/[dbname]
不幸没有运气。 似乎数据库只是接受来自localhost的连接。 但是我无法找到如何改变它。 如果有人有想法会很棒。
继承人部署配置
apiVersion: v1
kind: DeploymentConfig
metadata:
annotations:
template.alpha.openshift.io/wait-for-ready: "true"
creationTimestamp: null
generation: 1
labels:
app: mongodb-persistent
template: mongodb-persistent-template
name: mongodb
spec:
replicas: 1
selector:
name: mongodb
strategy:
activeDeadlineSeconds: 21600
recreateParams:
timeoutSeconds: 600
resources: {}
type: Recreate
template:
metadata:
creationTimestamp: null
labels:
name: mongodb
spec:
containers:
- env:
- name: MONGODB_USER
valueFrom:
secretKeyRef:
key: database-user
name: mongodb
- name: MONGODB_PASSWORD
valueFrom:
secretKeyRef:
key: database-password
name: mongodb
- name: MONGODB_ADMIN_PASSWORD
valueFrom:
secretKeyRef:
key: database-admin-password
name: mongodb
- name: MONGODB_DATABASE
valueFrom:
secretKeyRef:
key: database-name
name: mongodb
image: registry.access.redhat.com/rhscl/mongodb-32-rhel7@sha256:82c79f0e54d5a23f96671373510159e4fac478e2aeef4181e61f25ac38c1ae1f
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 3
initialDelaySeconds: 30
periodSeconds: 10
successThreshold: 1
tcpSocket:
port: 27017
timeoutSeconds: 1
name: mongodb
ports:
- containerPort: 27017
protocol: TCP
readinessProbe:
exec:
command:
- /bin/sh
- -i
- -c
- mongo 127.0.1:27017/$MONGODB_DATABASE -u $MONGODB_USER -p $MONGODB_PASSWORD
--eval="quit()"
failureThreshold: 3
initialDelaySeconds: 3
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
resources:
limits:
memory: 512Mi
securityContext:
capabilities: {}
privileged: false
terminationMessagePath: /dev/termination-log
volumeMounts:
- mountPath: /var/lib/mongodb/data
name: mongodb-data
dnsPolicy: ClusterFirst
restartPolicy: Always
securityContext: {}
terminationGracePeriodSeconds: 30
volumes:
- name: mongodb-data
persistentVolumeClaim:
claimName: mongodb
test: false
triggers:
- imageChangeParams:
automatic: true
containerNames:
- mongodb
from:
kind: ImageStreamTag
name: mongodb:3.2
namespace: openshift
type: ImageChange
- type: ConfigChange
status:
availableReplicas: 0
latestVersion: 0
observedGeneration: 0
replicas: 0
unavailableReplicas: 0
updatedReplicas: 0
服务配置
apiVersion: v1
kind: Service
metadata:
annotations:
template.openshift.io/expose-uri: mongodb://{.spec.clusterIP}:{.spec.ports[?(.name=="mongo")].port}
creationTimestamp: null
labels:
app: mongodb-persistent
template: mongodb-persistent-template
name: mongodb
spec:
ports:
- name: mongo
port: 27017
protocol: TCP
targetPort: 27017
selector:
name: mongodb
sessionAffinity: None
type: ClusterIP
status:
loadBalancer: {}
和豆荚
apiVersion: v1
kind: Pod
metadata:
annotations:
kubernetes.io/created-by: |
{"kind":"SerializedReference","apiVersion":"v1","reference":{"kind":"ReplicationController","namespace":"some-name-space","name":"mongodb-3","uid":"xxxx-xxx-xxx-xxxxxx","apiVersion":"v1","resourceVersion":"244413593"}}
kubernetes.io/limit-ranger: 'LimitRanger plugin set: cpu request for container
mongodb'
openshift.io/deployment-config.latest-version: "3"
openshift.io/deployment-config.name: mongodb
openshift.io/deployment.name: mongodb-3
openshift.io/scc: nfs-scc
creationTimestamp: null
generateName: mongodb-3-
labels:
deployment: mongodb-3
deploymentconfig: mongodb
name: mongodb
ownerReferences:
- apiVersion: v1
controller: true
kind: ReplicationController
name: mongodb-3
uid: a694b832-5dd2-11e8-b2fc-40f2e91e2433
spec:
containers:
- env:
- name: MONGODB_USER
valueFrom:
secretKeyRef:
key: database-user
name: mongodb
- name: MONGODB_PASSWORD
valueFrom:
secretKeyRef:
key: database-password
name: mongodb
- name: MONGODB_ADMIN_PASSWORD
valueFrom:
secretKeyRef:
key: database-admin-password
name: mongodb
- name: MONGODB_DATABASE
valueFrom:
secretKeyRef:
key: database-name
name: mongodb
image: registry.access.redhat.com/rhscl/mongodb-32-rhel7@sha256:82c79f0e54d5a23f96671373510159e4fac478e2aeef4181e61f25ac38c1ae1f
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 3
initialDelaySeconds: 30
periodSeconds: 10
successThreshold: 1
tcpSocket:
port: 27017
timeoutSeconds: 1
name: mongodb
ports:
- containerPort: 27017
protocol: TCP
readinessProbe:
exec:
command:
- /bin/sh
- -i
- -c
- mongo 127.0.1:27017/$MONGODB_DATABASE -u $MONGODB_USER -p $MONGODB_PASSWORD
--eval="quit()"
failureThreshold: 3
initialDelaySeconds: 3
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 1
resources:
limits:
memory: 512Mi
requests:
cpu: 250m
memory: 512Mi
securityContext:
capabilities:
drop:
- KILL
- MKNOD
- SETGID
- SETUID
- SYS_CHROOT
privileged: false
runAsUser: 1049930000
seLinuxOptions:
level: s0:c223,c212
terminationMessagePath: /dev/termination-log
volumeMounts:
- mountPath: /var/lib/mongodb/data
name: mongodb-data
- mountPath: /var/run/secrets/kubernetes.io/serviceaccount
name: default-token-rfvr5
readOnly: true
dnsPolicy: ClusterFirst
imagePullSecrets:
- name: default-dockercfg-3mpps
nodeName: thenode.name.net
nodeSelector:
region: primary
restartPolicy: Always
securityContext:
fsGroup: 1049930000
seLinuxOptions:
level: s0:c223,c212
supplementalGroups:
- 5555
serviceAccount: default
serviceAccountName: default
terminationGracePeriodSeconds: 30
volumes:
- name: mongodb-data
persistentVolumeClaim:
claimName: mongodb
- name: default-token-rfvr5
secret:
defaultMode: 420
secretName: default-token-rfvr5
status:
phase: Pending
好的,这是一个漫长的搜索,最后我能够解决它。 我的第一个错误是,路由不适合与数据库建立连接,因为它们只使用http协议。
现在有2个用例留给我
1.本地机器
由于路由不起作用,因此使用端口转发。 我以前读过这个,但并不真正理解它的含义(我认为服务本身就是转发端口)。
当您在本地计算机上时,您将使用oc执行以下操作
oc port-forward <pod-name> <local-port>:<remote-port>
您将获得转发端口的信息。 现在问题是,在您的应用程序中,您现在将连接到localhost(即使在本地计算机上)
2.在OpenShift上运行的应用程序
将代码上传到OpenShift后(在我的情况下,只需添加到项目 - > Node.js - >添加您的仓库),localhost将不再工作。 我花了一段时间才能理解,只要你在同一个项目中,你的环境变量就会有很多信息。 所以只需检查数据库服务的名称(在我的情况下是mongodb),你会发现要使用的主机和端口
摘要
这是一个现在可以运行的小代码示例,也可以在本地机器上运行,就像在OpenShift上一样。 我已经在OpenShift上建立了一个名为mongodb的persoand MongoDB。
代码没有做太多,但它会建立连接并告诉你它确实如此,所以你知道它正在工作。
var mongoose = require('mongoose');
// Connect to Mongodb
var username = process.env.MONGO_DB_USERNAME || 'someUserName';
var password = process.env.MONGO_DB_PASSWORD || 'somePassword';
var host = process.env.MONGODB_SERVICE_HOST || '127.0.0.1';
var port = process.env.MONGODB_SERVICE_PORT || '27017';
var database = process.env.MONGO_DB_DATABASE || 'sampledb';
console.log('---DATABASE PARAMETERS---');
console.log('Host: ' + host);
console.log('Port: ' + port);
console.log('Username: ' + username);
console.log('Password: ' + password);
console.log('Database: ' + database);
var connectionString = 'mongodb://' + username + ':' + password +'@' + host + ':' + port + '/' + database;
console.log('---CONNECTING TO---');
console.log(connectionString);
mongoose.connect(connectionString);
mongoose.connection.once('open', (data) => {
console.log('Connection has been made');
console.log(data);
});
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