Kubernetes MySQL connection timeout - kubernetes

Question

I've set up a Kubernetes deployment and service for MySQL. I cannot access the MySQL service from any pod using its DNS name... It just times out. Any other port refuses the connection immediately, but the port in my service configuration times out after ~10 seconds.
I am able to resolve the MySQL Pod DNS.
I cannot ping the host.
Service.yml
apiVersion: v1
kind: Service
metadata:
name: mysql-service
labels:
run: mysql-service
spec:
ports:
- port: 3306
protocol: TCP
- port: 3306
protocol: UDP
selector:
run: mysql-service
Deployment.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: mysql-service
labels:
app: mysql-service
spec:
replicas: 1
selector:
matchLabels:
app: mysql-service
template:
metadata:
labels:
app: mysql-service
spec:
containers:
- name: 'mysql-service'
image: mysql:5.5
env:
- name: MYSQL_ROOT_PASSWORD
value: some_password
- name: MYSQL_DATABASE
value: some_database
ports:
- containerPort: 3306

Answer 1

Your deployment (and more specifically its pod spec) says
labels:
app: mysql-service
but your service says
selector:
run: mysql-service
These don't match, so your service isn't attaching to the pod. You should also see this if you kubectl describe service mysql-service, the "endpoints" list will be empty.
Change the service's selector to match the pod's labels (or vice versa) and this should be better.