Add service and update readme

16-sidecar-containers/00-fluentd-configmap.yml

@@ -1,20 +0,0 @@
----
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: fluentd
-data:
-  fluent.conf: |
-    <source>
-      @type tail
-      path /logs/*
-      pos_file /tmp/fluentd-nginx-pos.log
-      tag nginx
-      <parse>
-        @type nginx
-      </parse>
-    </source>
-
-    <match nginx>
-      @type stdout
-    </match>

16-sidecar-containers/01-sidecar.yml

@@ -3,6 +3,8 @@ apiVersion: v1
 kind: Pod
 metadata:
   name: two-containers
+  labels:
+    app: sidecar-container
 spec:
   volumes:
     - name: shared-logs
@@ -13,6 +15,8 @@ spec:
   containers:
     - name: nginx
       image: nginx
+      ports:
+        - containerPort: 80
       volumeMounts:
         - name: shared-logs
           mountPath: /var/log/nginx
@@ -23,3 +27,34 @@ spec:
           mountPath: /logs
         - name: fluentd-config
           mountPath: /fluentd/etc
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: fluentd
+data:
+  fluent.conf: |
+    <source>
+      @type tail
+      path /logs/*
+      pos_file /tmp/fluentd-nginx-pos.log
+      tag nginx
+      <parse>
+        @type nginx
+      </parse>
+    </source>
+
+    <match nginx>
+      @type stdout
+    </match>
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx
+spec:
+  ports:
+    - port: 80
+      targetPort: 80
+  selector:
+    app: sidecar-container

16-sidecar-containers/README.md

@@ -14,7 +14,7 @@ spec:
   - name: container1
     image: nginx
   - name: container2
-    image: busybox
+    image: fluentd
 ```
 
 Here we have 2 containers: `container1` and `container2`.
@@ -33,14 +33,20 @@ Istio, the service mesh tool, installs a sidecar container to do its job: https:
 
 ## Exercices
 
-Review and apply the file [01-sidecar.yml](01-sidecar.yml). Connect to the `nginx` container and look at the file system in `/usr/share/nginx/html`.
+Review and apply the file [01-sidecar.yml](01-sidecar.yml).
+
+Connect to the `nginx` container (`kubectl exec -it two-containers -c nginx`) and look at the file system in `/var/log/nginx`.
+
+Do the same for the `fluentd` container and this time look in `/logs`. What do you see?
+
+Tail the logs from the fluentd pod (`kubectl logs -f two-containers -c fluentd`) and in another terminal window, send requests to the nginx service with a curl from a separate pod. What do you see? How do you explain it?
 
 This exercice is taken from the [official Kubernetes documentation](https://kubernetes.io/docs/tasks/access-application-cluster/communicate-containers-same-pod-shared-volume/#creating-a-pod-that-runs-two-containers).
 
 ## Clean up
 
 ```sh
-kubectl delete service,deployment,pod --all
+kubectl delete service,deployment,pod,configmap --all
 ```
 
 ## Links