Pod can't connect to MongoDB outside the cluster.

[rviar]

Hello!
I have a problem with connecting to a database that is outside the cluster.
I can ping the server from the pod, but if i try communicate with 27017 port, then always get an error "Connection timed out".
Firewall on the monodb server is correct, and I can connect to database from other servers, but not from the cluster.

The result of curl command:

user@tmp-6666c75586-ffdmg:/home/node$ curl -v ***.***.***.***      
*   Trying ***.***.***.***:80...
* connect to ***.***.***.*** port 80 failed: Connection refused
* Failed to connect to ***.***.***.*** port 80: Connection refused
* Closing connection 0
curl: (7) Failed to connect to ***.***.***.*** port 80: Connection refused

Server with mongoDB close the connection because port 80 is closed, its ok.
If just ping the server also everything is work.

But when I try telnet or curl to port 27017 then I always get Timeout.

I'm try create NetworkPolicy like this:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-all-egress
spec:
  podSelector: {}
  policyTypes:
    - Egress
  egress:
    - {}

or this:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: egress-allow-internet-only
  namespace: default
spec:
  podSelector: {}
  policyTypes:
    - Egress
  egress:
    - to:
        - ipBlock:
            cidr: 0.0.0.0/0
            except:
              - 10.0.0.0/8
              - 172.16.0.0/12
              - 192.168.0.0/16
    - ports:
        - protocol: TCP
          port: 27017

but didn't help...

I will be grateful for any help!

[mysticaltech]

You could maybe add a firewall rule with the extra_firewall_rules variable.

Try it and let me know!

[rviar]

Wow! My bad, I was not careful enough when looking through the config.
This solved my problem!

Thanks you for this project! It's really helpful project which save a lot time without any headache!

[Gilaco]

I am experiencing exactly same issue... port 27017.

I have an extra firewall rule - however from some weird reason some nodes are blocking egress on port 27017 and others allow.

Not sure if that relates to when a node was created and how FW rules are applied - but I must understand the root cause that leads to it and resolve it... I have a cluster with 20 nodes, I must be sure that all can connect outside ... :-)

Any help is appreciated.

Thanks
🙏🏻