<p>I'm having a few issues getting Ambassador to work correctly. I'm new to Kubernetes and just teaching myself.</p>

<p>I have successfully managed to work through the demo material Ambassador provide - e.g /httpbin/ endpoint is working correctly, but when I try to deploy a Go service it is falling over.</p>

<p>When hitting the 'qotm' endpoint, the page this is the response: </p>

<pre><code>upstream request timeout
</code></pre>

<p>Pod status:</p>

<pre><code>CrashLoopBackOff
</code></pre>

<p>From my research, it seems to be related to the yaml file not being configured correctly but I'm struggling to find any documentation relating to this use case.</p>

<p>My cluster is running on AWS EKS and the images are being pushed to AWS ECR.</p>

<p>main.go: </p>

<pre><code>package main

import (
    "fmt"
    "net/http"
    "os"
)

func main() {
    var PORT string
    if PORT = os.Getenv("PORT"); PORT == "" {
        PORT = "3001"
    }
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello World from path: %s\n", r.URL.Path)
    })
    http.ListenAndServe(":" + PORT, nil)
}
</code></pre>

<p>Dockerfile:</p>

<pre><code>FROM golang:alpine
ADD ./src /go/src/app
WORKDIR /go/src/app
EXPOSE 3001
ENV PORT=3001
CMD ["go", "run", "main.go"]
</code></pre>

<p>test.yaml: </p>

<pre><code>apiVersion: v1
kind: Service
metadata:
  name: qotm
  annotations:
    getambassador.io/config: |
      ---
      apiVersion: ambassador/v1
      kind:  Mapping
      name:  qotm_mapping
      prefix: /qotm/
      service: qotm
spec:
  selector:
    app: qotm
  ports:
    - port: 80
      name: http-qotm
      targetPort: http-api
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: qotm
spec:
  replicas: 1
  strategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: qotm
    spec:
      containers:
        - name: qotm
          image: ||REMOVED||
          ports:
            - name: http-api
              containerPort: 3001
          readinessProbe:
            httpGet:
              path: /health
              port: 5000
            initialDelaySeconds: 30
            periodSeconds: 3
          resources:
            limits:
              cpu: "0.1"
              memory: 100Mi
</code></pre>

<p>Pod description:</p>

<pre><code>Name:               qotm-7b9bf4d499-v9nxq
Namespace:          default
Priority:           0
PriorityClassName:  &lt;none&gt;
Node:               ip-192-168-89-69.eu-west-1.compute.internal/192.168.89.69
Start Time:         Sun, 17 Mar 2019 17:19:50 +0000
Labels:             app=qotm
                    pod-template-hash=3656908055
Annotations:        &lt;none&gt;
Status:             Running
IP:                 192.168.113.23
Controlled By:      ReplicaSet/qotm-7b9bf4d499
Containers:
  qotm:
    Container ID:   docker://5839996e48b252ac61f604d348a98c47c53225712efd503b7c3d7e4c736920c4
    Image:          IMGURL
    Image ID:       docker-pullable://IMGURL
    Port:           3001/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       CrashLoopBackOff
    Last State:     Terminated
      Reason:       Error
      Exit Code:    1
      Started:      Sun, 17 Mar 2019 17:30:49 +0000
      Finished:     Sun, 17 Mar 2019 17:30:49 +0000
    Ready:          False
    Restart Count:  7
    Limits:
      cpu:     100m
      memory:  200Mi
    Requests:
      cpu:        100m
      memory:     200Mi
    Readiness:    http-get http://:3001/health delay=30s timeout=1s period=3s #success=1 #failure=3
    Environment:  &lt;none&gt;
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-5bbxw (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             False 
  ContainersReady   False 
  PodScheduled      True 
Volumes:
  default-token-5bbxw:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-5bbxw
    Optional:    false
QoS Class:       Guaranteed
Node-Selectors:  &lt;none&gt;
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason     Age                  From                                                  Message
  ----     ------     ----                 ----                                                  -------
  Normal   Scheduled  12m                  default-scheduler                                     Successfully assigned default/qotm-7b9bf4d499-v9nxq to ip-192-168-89-69.eu-west-1.compute.internal
  Normal   Pulled     10m (x5 over 12m)    kubelet, ip-192-168-89-69.eu-west-1.compute.internal  Container image "IMGURL" already present on machine
  Normal   Created    10m (x5 over 12m)    kubelet, ip-192-168-89-69.eu-west-1.compute.internal  Created container
  Normal   Started    10m (x5 over 11m)    kubelet, ip-192-168-89-69.eu-west-1.compute.internal  Started container
  Warning  BackOff    115s (x47 over 11m)  kubelet, ip-192-168-89-69.eu-west-1.compute.internal  Back-off restarting failed container
</code></pre>

<p>In your kubernetes deployment file you have exposed a readiness probe on port 5000 while your application is exposed on port 3001, also while running the container a few times I got OOMKilled so increased the memory limit. Anyways below deployment file should work fine.</p>

<pre><code>apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: qotm
spec:
  replicas: 1
  strategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: qotm
    spec:
      containers:
        - name: qotm
          image: &lt;YOUR_IMAGE&gt;
          imagePullPolicy: Always
          ports:
            - name: http-api
              containerPort: 3001
          readinessProbe:
            httpGet:
              path: /health
              port: 3001
            initialDelaySeconds: 30
            periodSeconds: 3
          resources:
            limits:
              cpu: "0.1"
              memory: 200Mi
</code></pre>
