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Server Health Check
You can enable haproxy-health-checks for a specific backend server by applying ingress.appscode.com/check and ingress.appscode.com/check-port annotations to the corresponding service. You can also configure health-check behavior using backend rules.
Example
First deploy and expose a test server:
$ kubectl apply -f test-server.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
run: test-server
name: test-server
namespace: default
spec:
selector:
matchLabels:
run: test-server
template:
metadata:
labels:
run: test-server
spec:
containers:
- image: appscode/test-server:2.2
name: test-server
---
apiVersion: v1
kind: Service
metadata:
labels:
run: test-server
name: test-server
namespace: default
spec:
ports:
- port: 8080
targetPort: 8080
name: web
- port: 9090
targetPort: 9090
name: health
selector:
run: test-server
Here, port 8080 will serve client’s request and port 9090 will be used for health checks.
Then deploy the ingress:
$ kubectl apply test-ingress.yaml
apiVersion: voyager.appscode.com/v1
kind: Ingress
metadata:
name: test-ingress
namespace: default
spec:
rules:
- http:
paths:
- path: /app
backend:
service:
name: test-server
port:
number: 8080
Now we need to annotate the backend service to enable health check for that backend.
$ kubectl annotate svc test-server ingress.appscode.com/check="true"
$ kubectl annotate svc test-server ingress.appscode.com/check-port="9090"
You can also specify the health-check behaviour using backend rules. For example:
apiVersion: voyager.appscode.com/v1
kind: Ingress
metadata:
name: test-ingress
namespace: default
spec:
rules:
- http:
paths:
- path: /app
backend:
service:
name: test-server
port:
number: 8080
backendRules:
- 'option httpchk GET /testpath/ok'
- 'http-check expect rstring (testpath/ok)'