I'm currently setting up a postgres instance on my Kubernetes cluster hosted on OVH public cloud. The problem is that I can't access it. I know that I have to make psql -h host -U user --password -p 30904 db
to connect, but the problem is that i don't know what to put instead of host . Localhost? The ip of the master node? Another ip?
Thank you for your time.
postgres-deploy.yaml:
apiVersion: v1
kind: Service
metadata:
name: postgres
spec:
type:
NodePort
ports:
- port: 5432
selector:
app: postgres
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
name: postgres
spec:
selector:
matchLabels:
app: postgres
strategy:
type: Recreate
template:
metadata:
labels:
app: postgres
spec:
containers:
- image: postgres:13.1
name: postgres
env:
- name: POSTGRES_DB
valueFrom:
secretKeyRef:
name: ident
key: POSTGRES_DB
name: POSTGRES_USER
valueFrom:
secretKeyRef:
name: ident
key: POSTGRES_USER
name: POSTGRES_PASSWORD
valueFrom:
secretKeyRef:
name: ident
key: POSTGRES_PASSWORD
ports:
- containerPort: 5432
name: postgres
volumeMounts:
- name: postgres-persistent-storage
mountPath: /var/lib/postgresql/data2
volumes:
- name: postgres-persistent-storage
persistentVolumeClaim:
claimName: postgres-pv-claim
You can try something like this:
kubectl exec -it $(kubectl get pods -n %YOURNAMESPACE% | grep postgres | cut -d " " -f1) -n %YOURNAMESPACE% -- bash -c "psql -U postgres -c 'SELECT current_database()'"
Or omit the namespace thing if you need it in current namespace:
kubectl exec -it $(kubectl get pods | grep postgres | cut -d " " -f1) -n -- bash -c "psql -U postgres -c 'SELECT current_database()'"
I have deployed your YAMLs
and I was able to connect.
In --h
you have to provide IP of node
or host machine
where PostgreSQL
pod was deployed.
I have tested this on my GKE cluster.
Based on your YAMLs
and this tutorial. Mainly for ConfigMap
and PV/PVC
configuration.
POSTGRES_DB: postgresdb
POSTGRES_USER: postgresadmin
POSTGRES_PASSWORD: admin123
$ kubectl get po
NAME READY STATUS RESTARTS AGE
postgres-5586dc9864-pwpsn 1/1 Running 0 37m
You have to kubectl exec
to PostgreSQL
pod.
$ kubectl exec -ti postgres-5586dc9864-pwpsn -- bin/bash
root@postgres-5586dc9864-pwpsn:/#
Use psql
command to connect database
.
root@postgres-5586dc9864-pwpsn:/# psql -p 5432 -U postgresadmin -d postgresdb
psql (13.1 (Debian 13.1-1.pgdg100+1))
Type "help" for help.
postgresdb=#
Service Details:
$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.28.0.1 <none> 443/TCP 60m
postgres NodePort 10.28.14.2 <none> 5432:31431/TCP 45m
Pod Details:
$ kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
postgres-5586dc9864-pwpsn 1/1 Running 0 41m 10.24.1.6 gke-cluster-1-default-pool-8baf2b67-jjjh <none> <none>
Node details, where PostgreSQL
pod was deployed.
$ kubectl get node -o wide | grep gke-cluster-1-default-pool-8baf2b67-jjjh
gke-cluster-1-default-pool-8baf2b67-jjjh Ready <none> 56m v1.16.15-gke.4300 10.154.15.222 35.197.210.241 Container-Optimized OS from Google 4.19.112+ docker://19.3.1
NodeIP
address of node
where PostgreSQL
pod was deployed is 10.154.15.222
.
Command:
$ kubectl exec -ti <podname> -- psql -h <Internal IP address of hosting node> -U postgresadmin --password -p <nodeport number from service> <database name>
Output:
$ kubectl exec -ti postgres-5586dc9864-pwpsn -- psql -h 10.154.15.222 -U postgresadmin --password -p 31431 postgresdb
Password:
psql (13.1 (Debian 13.1-1.pgdg100+1))
Type "help" for help.
postgresdb=#
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