I believe my question is pretty straightforward. I'm doing my prerequisites to install Kubernetes cluster on bare metal.
Let's say I have:
master - hostname for Docker DB container which is fixed on first node
slave - hostname for Docker DB container which is fixed on second node
Can I communicate with master from any container (app, etc.) in a cluster regardless it's running on the same node or not?
Is this a default behaviour? Or anything additional should be done?
I assume that I need to setup hostname parameter in YAML or JSON file so Kubernetes is aware what the hostname is.
Probably this is not the factor, but I plan to use Kubespray installation method so it gets Calico networking for k8s.
Many thanks
Yes,
You can access and communication from any container in a namespace via hostname.
Here is an example about Kubernetes Service configure:
---
apiVersion: v1
kind: Service
metadata:
name: master
labels:
name: master
namespace: smart-office
spec:
ports:
- port: 5672
name: master
targetPort: 5672
selector:
name: masterDeployment configure:
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: master
labels:
name: master
namespace: smart-office
spec:
replicas: 1
template:
metadata:
labels:
name: master
annotations:
prometheus.io/scrape: "false"
spec:
containers:
- name: master
image: rabbitmq:3.6.8-management
ports:
- containerPort: 5672
name: master
nodeSelector:
beta.kubernetes.io/os: linuxAnd from other services, for e.g your slaver .env will be:
AMQP_HOST=master <---- The hostname
AMQP_PORT=5672
AMQP_USERNAME=guest
AMQP_PASSWORD=guest
AMQP_HEARTBEAT=60It's will work inside Cluster even if you not publish External IP.
Hope this can help you.