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1

New to Kubernetes.

To build our testing environment, I'm trying to set up a PostgreSQL instance in Kubernetes, that's accessible to other pods in the testing cluster.

The pod and service are both syntactically valid and running. Both show in the output from kubectl get [svc/pods]. But when another pod tries to access the database, it times out.

Here's the specification of the pod:

# this defines the postgres server
apiVersion: v1
kind: Pod
metadata:
 name: postgres
 labels:
 app: postgres
spec:
 hostname: postgres
 restartPolicy: OnFailure
 containers:
 - name: postgres
 image: postgres:9.6.6
 imagePullPolicy: IfNotPresent
 ports:
 - containerPort: 5432
 protocol: TCP

And here is the definition of the service:

# this defines a "service" that makes the postgres server publicly visible
apiVersion: v1
kind: Service
metadata:
 name: postgres
spec:
 selector:
 app: postgres
 type: ClusterIP
 ports:
 - port: 5432
 protocol: TCP

I'm certain that something is wrong with at least one of those, but I'm not sufficiently familiar with Kubernetes to know which.

If it's relevant, we're running on Google Kubernetes Engine.

Help appreciated!

kubernetes google-kubernetes-engine

share|improve this question

asked Mar 26 at 23:03

Eric FulmerEric Fulmer

41411 gold badge44 silver badges1616 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  how do you hit postgres db from other pod?
  
  – P Ekambaram
  Mar 27 at 7:07
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Are pods and Postgres on the same namespace? How are you trying to connect to Postgres from your app? Which DNS/hostname are you using?
  
  – Jose Armesto
  Mar 27 at 9:43
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @fiunchinho Yes, both the pods are in the same dev namespace. For our app, we've got something in Python that uses SQLAlchemy. We're also using the tenacity package to handle retrying, so we're eventually just getting a time-out related error from tenacity.
  
  – Eric Fulmer
  Mar 27 at 14:57
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  can you share the connection string?
  
  – Jose Armesto
  Mar 27 at 15:09
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  can you try to exec into one of your containers (preferably the python container) and try to curl postgres:5432? also - is the service supposed to be exposed outside the cluster? you can try for testing purposes to remove type: ClusterIP
  
  – Amityo
  Mar 28 at 14:00
  

  
  
  
  

 | 
show 1 more comment

1

New to Kubernetes.

To build our testing environment, I'm trying to set up a PostgreSQL instance in Kubernetes, that's accessible to other pods in the testing cluster.

The pod and service are both syntactically valid and running. Both show in the output from kubectl get [svc/pods]. But when another pod tries to access the database, it times out.

Here's the specification of the pod:

# this defines the postgres server
apiVersion: v1
kind: Pod
metadata:
 name: postgres
 labels:
 app: postgres
spec:
 hostname: postgres
 restartPolicy: OnFailure
 containers:
 - name: postgres
 image: postgres:9.6.6
 imagePullPolicy: IfNotPresent
 ports:
 - containerPort: 5432
 protocol: TCP

And here is the definition of the service:

# this defines a "service" that makes the postgres server publicly visible
apiVersion: v1
kind: Service
metadata:
 name: postgres
spec:
 selector:
 app: postgres
 type: ClusterIP
 ports:
 - port: 5432
 protocol: TCP

I'm certain that something is wrong with at least one of those, but I'm not sufficiently familiar with Kubernetes to know which.

If it's relevant, we're running on Google Kubernetes Engine.

Help appreciated!

kubernetes google-kubernetes-engine

share|improve this question

asked Mar 26 at 23:03

Eric FulmerEric Fulmer

41411 gold badge44 silver badges1616 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  how do you hit postgres db from other pod?
  
  – P Ekambaram
  Mar 27 at 7:07
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Are pods and Postgres on the same namespace? How are you trying to connect to Postgres from your app? Which DNS/hostname are you using?
  
  – Jose Armesto
  Mar 27 at 9:43
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @fiunchinho Yes, both the pods are in the same dev namespace. For our app, we've got something in Python that uses SQLAlchemy. We're also using the tenacity package to handle retrying, so we're eventually just getting a time-out related error from tenacity.
  
  – Eric Fulmer
  Mar 27 at 14:57
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  can you share the connection string?
  
  – Jose Armesto
  Mar 27 at 15:09
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  can you try to exec into one of your containers (preferably the python container) and try to curl postgres:5432? also - is the service supposed to be exposed outside the cluster? you can try for testing purposes to remove type: ClusterIP
  
  – Amityo
  Mar 28 at 14:00
  

  
  
  
  

 | 
show 1 more comment

New to Kubernetes.

To build our testing environment, I'm trying to set up a PostgreSQL instance in Kubernetes, that's accessible to other pods in the testing cluster.

The pod and service are both syntactically valid and running. Both show in the output from kubectl get [svc/pods]. But when another pod tries to access the database, it times out.

Here's the specification of the pod:

# this defines the postgres server
apiVersion: v1
kind: Pod
metadata:
 name: postgres
 labels:
 app: postgres
spec:
 hostname: postgres
 restartPolicy: OnFailure
 containers:
 - name: postgres
 image: postgres:9.6.6
 imagePullPolicy: IfNotPresent
 ports:
 - containerPort: 5432
 protocol: TCP

And here is the definition of the service:

# this defines a "service" that makes the postgres server publicly visible
apiVersion: v1
kind: Service
metadata:
 name: postgres
spec:
 selector:
 app: postgres
 type: ClusterIP
 ports:
 - port: 5432
 protocol: TCP

I'm certain that something is wrong with at least one of those, but I'm not sufficiently familiar with Kubernetes to know which.

If it's relevant, we're running on Google Kubernetes Engine.

Help appreciated!

kubernetes google-kubernetes-engine

share|improve this question

asked Mar 26 at 23:03

Eric FulmerEric Fulmer

41411 gold badge44 silver badges1616 bronze badges

# this defines the postgres server
apiVersion: v1
kind: Pod
metadata:
 name: postgres
 labels:
 app: postgres
spec:
 hostname: postgres
 restartPolicy: OnFailure
 containers:
 - name: postgres
 image: postgres:9.6.6
 imagePullPolicy: IfNotPresent
 ports:
 - containerPort: 5432
 protocol: TCP

# this defines a "service" that makes the postgres server publicly visible
apiVersion: v1
kind: Service
metadata:
 name: postgres
spec:
 selector:
 app: postgres
 type: ClusterIP
 ports:
 - port: 5432
 protocol: TCP

kubernetes google-kubernetes-engine

kubernetes google-kubernetes-engine

share|improve this question

asked Mar 26 at 23:03

Eric FulmerEric Fulmer

41411 gold badge44 silver badges1616 bronze badges

share|improve this question

asked Mar 26 at 23:03

Eric FulmerEric Fulmer

41411 gold badge44 silver badges1616 bronze badges

asked Mar 26 at 23:03

Eric FulmerEric Fulmer

41411 gold badge44 silver badges1616 bronze badges

asked Mar 26 at 23:03

Eric FulmerEric Fulmer

41411 gold badge44 silver badges1616 bronze badges