I try to get started with fabric 8 and open shift on docker. An open shift instance (single docker container) is running as described here: https://docs.openshift.org/latest/getting_started/administrators.html#running-in-a-docker-container. I installed fabric 8 as http://fabric8.io/guide/getStarted/openshift.html and now the basic pods are running.
But I cannot reach the service
oc get services
NAME CLUSTER_IP EXTERNAL_IP PORT(S) SELECTOR AGE
docker-registry 172.30.194.44 <none> 5000/TCP docker-registry=default 18h
fabric8 172.30.178.196 80/TCP group=io.fabric8.apps,project=console,provider=fabric8 18h
kubernetes 172.30.0.1 <none> 443/TCP,53/UDP,53/TCP <none> 20h
router 172.30.77.252 <none> 80/TCP router=router 18h
oc describe service fabric8
Name: fabric8
Namespace: default
Labels: group=io.fabric8.apps,project=console,provider=fabric8,version=2.2.116
Selector: group=io.fabric8.apps,project=console,provider=fabric8
Type: LoadBalancer
IP: 172.30.178.196
Port: <unnamed> 80/TCP
NodePort: <unnamed> 30308/TCP
Endpoints: 172.17.0.2:9090
Session Affinity: None
No events.
ping 172.17.0.2:9090
ping: unknown host 172.17.0.2:9090
gheiler@testCluster:~$ ping 172.30.178.196
PING 172.30.178.196 (172.30.178.196) 56(84) bytes of data.
From 62.218.18.245 icmp_seq=1 Destination Host Unreachable
From 62.218.18.245 icmp_seq=2 Destination Host Unreachable
In the troubleshooting section of: http://fabric8.io/guide/getStarted/openshift.html some ideas like
corsAllowedOrigins:
- .*
are suggested. But I do not know how to enable them in the docker container. Do you have any ideas why I cannot reach my basic fabric8 console?
If you are trying to access a service on OpenShift remotely then you need to ensure you've deployed a router & added a Route. You can read more on routing in OpenShift at https://docs.openshift.com/enterprise/3.0/architecture/core_concepts/routes.html.
In this case if you add a route with:
cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Route
metadata:
name: fabric8-console
pec:
host: <EXTERNALLY_RESOLVE_DNS>
to:
kind: Service
name: fabric8
EOF
As some extra info, you cannot target ping at a port. Ping uses a different network protocol, ICMP, which doesn't have the notion of ports. Also, both services & pods don't respond to ping so you will not be able to ping them. If you're trying to check connectivity then you can use the nc utility:
nc -v <address> <port>
This will report connection success if the address/port is reachable. Note that in OpenShift, pod IPs & service IPs are generally only routeable inside the cluster, i.e. on nodes, so trying this from outside the cluster will probably fail.