kubernetes - 如何使用本地 dev minikube 进入 Kubernetes 中的 postgres

Question

请有人帮助我吗？这是我在这里的第一篇文章，我真的很高兴开始在这里发帖并帮助人们，但我首先需要帮助。

我正在 Minikube 上部署我自己的 Postgres 数据库。对于数据库、密码和用户名，我使用的是 secret 。

数据使用 base64 编码

POSTGRES_USER = website_user

POSTGRES_DB = 网站

POSTGRES_PASSWORD = 通过

我还执行到容器中，看看我是否可以看到这些 envs 并且它们在那里。

问题是当我尝试使用 psql 进入 postgres 时。我在这个命令之后检查了 minikube ip 并输入了正确的密码(pass):

pqsl -h 192.168.99.100 -U website_user -p 31315 website

错误

Password for user website_user:
psql: FATAL: password authentication failed for user "website_user"

另外，如果我执行到我的 pod:

kubectl exec -it postgres-deployment-744fcdd5f5-7f7vx bash

并尝试进入 postgres 我得到:

psql -h $(hostname -i) -U website_user -p 5432 website

错误:

Password for user website_user:
psql: FATAL: password authentication failed for user "website_user"

我这里缺少一些东西。我也尝试过 ps aux在容器中，一切似乎都在运行 postgres 进程

kubectl get all

输出:

NAME                                       READY   STATUS    RESTARTS   AGE
pod/postgres-deployment-744fcdd5f5-7f7vx   1/1     Running   0          18m

NAME                       TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
service/kubernetes         ClusterIP   10.96.0.1        <none>        443/TCP          19m
service/postgres-service   NodePort    10.109.235.114   <none>        5432:31315/TCP   18m

NAME                                  READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/postgres-deployment   1/1     1            1           18m

NAME                                             DESIRED   CURRENT   READY   AGE
replicaset.apps/postgres-deployment-744fcdd5f5   1         1         1       18m

# Secret store
apiVersion: v1
kind: Secret
metadata:
  name: postgres-credentials
type: Opaque
data:
  POSTGRES_USER: d2Vic2l0ZV91c2VyCg==
  POSTGRES_PASSWORD: cGFzcwo=
  POSTGRES_DB: d2Vic2l0ZQo=


---
# Persistent Volume
apiVersion: v1
kind: PersistentVolume
metadata:
  name: postgres-pv
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 2Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: /data/postgres-pv


---
# Persistent Volume Claim
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: postgres-pvc
  labels:
    type: local
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 2Gi
  volumeName: postgres-pv

---
# Deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgres-deployment
spec:
  selector:
    matchLabels:
      app: postgres-container
  template:
    metadata:
      labels:
        app: postgres-container
    spec:
      containers:
        - name: postgres-container
          image: postgres:9.6.6
          env:
            - name: POSTGRES_USER
              valueFrom:
                secretKeyRef:
                  name: postgres-credentials
                  key: POSTGRES_USER

            - name: POSTGRES_DB
              valueFrom:
                secretKeyRef:
                  name: postgres-credentials
                  key: POSTGRES_DB

            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: postgres-credentials
                  key: POSTGRES_PASSWORD

          ports:
            - containerPort: 5432
          volumeMounts:
            - mountPath: /var/lib/postgresql/data
              name: postgres-volume-mount
      volumes:
        - name: postgres-volume-mount
          persistentVolumeClaim:
            claimName: postgres-pvc

---
apiVersion: v1
kind: Service
metadata:
  name: postgres-service
spec:
  selector:
    app: postgres-container
  ports:
    - port: 5432
      protocol: TCP
      targetPort: 5432
  type: NodePort

Answer 1

您创建了所有值:

$ echo "value" | base64

相反，您应该使用:$ echo -n "value" | base64

以下是 echo 的官方手册页:

Description

Echo the STRING(s) to standard output.

-n = do not output the trailing newline

TL;博士 : 您需要编辑您的 Secret具有新值的定义:

$ echo -n "website_user" | base64

$ echo -n "website" | base64

$ echo -n "pass" | base64

您创建了您的 Secret带有尾随换行符。请看下面的例子:

POSTGRES_USER :

$ echo "website_user" | base64

输出:d2Vic2l0ZV91c2VyCg==和你的一样

$ echo -n "website_user" | base64

输出:d2Vic2l0ZV91c2Vy这是 正确 值(value)

POSTGRES_PASSWORD :

$ echo "pass" | base64

输出:cGFzcwo=和你的一样

$ echo -n "pass" | base64

输出:cGFzcw==这是 正确 值(value)

POSTGRES_DB :

$ echo "website" | base64

输出:d2Vic2l0ZQo=和你的一样

$ echo -n "website" | base64

输出:d2Vic2l0ZQ==这是 正确 值(value)

您的 Secret应该是这样的:

apiVersion: v1
kind: Secret
metadata:
  name: postgres-credentials
type: Opaque
data:
  POSTGRES_USER: d2Vic2l0ZV91c2Vy
  POSTGRES_PASSWORD: cGFzcw==
  POSTGRES_DB: d2Vic2l0ZQ==

如果您使用新的 Secret 创建它您应该能够连接到数据库:

root@postgres-deployment-64d697868c-njl7q:/# psql -h $(hostname -i) -U website_user -p 5432 website
Password for user website_user: 
psql (9.6.6)
Type "help" for help.

website=# 

请查看其他链接:

Github.com: Kubernetes: issues: Config map vs secret to store credentials for Postgres deployment

Kubernetes.io: Secrets