Add cronjobs and YAML catch up instructions

k8s/dockercoins.yaml

@@ -0,0 +1,160 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: hasher
+  name: hasher
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: hasher
+  template:
+    metadata:
+      labels:
+        app: hasher
+    spec:
+      containers:
+      - image: dockercoins/hasher:v0.1
+        name: hasher
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: hasher
+  name: hasher
+spec:
+  ports:
+  - port: 80
+    protocol: TCP
+    targetPort: 80
+  selector:
+    app: hasher
+  type: ClusterIP
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: redis
+  name: redis
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: redis
+  template:
+    metadata:
+      labels:
+        app: redis
+    spec:
+      containers:
+      - image: redis
+        name: redis
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: redis
+  name: redis
+spec:
+  ports:
+  - port: 6379
+    protocol: TCP
+    targetPort: 6379
+  selector:
+    app: redis
+  type: ClusterIP
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: rng
+  name: rng
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: rng
+  template:
+    metadata:
+      labels:
+        app: rng
+    spec:
+      containers:
+      - image: dockercoins/rng:v0.1
+        name: rng
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: rng
+  name: rng
+spec:
+  ports:
+  - port: 80
+    protocol: TCP
+    targetPort: 80
+  selector:
+    app: rng
+  type: ClusterIP
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: webui
+  name: webui
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: webui
+  template:
+    metadata:
+      labels:
+        app: webui
+    spec:
+      containers:
+      - image: dockercoins/webui:v0.1
+        name: webui
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: webui
+  name: webui
+spec:
+  ports:
+  - port: 80
+    protocol: TCP
+    targetPort: 80
+  selector:
+    app: webui
+  type: NodePort
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: worker
+  name: worker
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: worker
+  template:
+    metadata:
+      labels:
+        app: worker
+    spec:
+      containers:
+      - image: dockercoins/worker:v0.1
+        name: worker

slides/k8s/kubectlrun.md

@@ -278,6 +278,72 @@ Let's leave `kubectl logs` running while we keep exploring.
 
 ---
 
+## Scheduling periodic background work
+
+- A Cron Job is a job that will be executed at specific intervals
+
+  (the name comes from the traditional cronjobs executed by the UNIX crond)
+
+- It requires a *schedule*, represented as five space-separated fields:
+
+  - minute [0,59]
+  - hour [0,23]
+  - day of the month [1,31]
+  - month of the year [1,12]
+  - day of the week ([0,6] with 0=Sunday)
+
+- `*` means "all valid values"; `/N` means "every N"
+
+- Example: `*/3 * * * *` means "every three minutes"
+
+---
+
+## Creating a Cron Job
+
+- Let's create a simple job to be executed every three minutes
+
+- Cron Jobs need to terminate, otherwise they'd run forever
+
+.exercise[
+
+- Create the Cron Job:
+  ```bash
+  kubectl run --schedule="*/3 * * * *" --restart=OnFailure --image=alpine sleep 10
+  ```
+
+- Check the resource that was created:
+  ```bash
+  kubectl get cronjobs
+  ```
+
+]
+
+---
+
+## Cron Jobs in action
+
+- At the specified schedule, the Cron Job will create a Job
+
+- The Job will create a Pod
+
+- The Job will make sure that the Pod completes
+
+  (re-creating another one if it fails, for instance if its node fails)
+
+.exercise[
+
+- Check the Jobs that are created:
+  ```bash
+  kubectl get jobs
+  ```
+
+]
+
+(It will take a few minutes before the first job is scheduled.)
+
+---
+
+
 ## What about that deprecation warning?
 
 - As we can see from the previous slide, `kubectl run` can do many things

slides/k8s/yamldeploy.md

@@ -0,0 +1,93 @@
+# Deploying with YAML
+
+- So far, we created resources with the following commands:
+
+  - `kubectl run`
+
+  - `kubectl create deployment`
+
+  - `kubectl expose`
+
+- We can also create resources directly with YAML manifests
+
+---
+
+## `kubectl apply` vs `create`
+
+- `kubectl create -f whatever.yaml`
+
+  - creates resources if they don't exist
+
+  - if resources already exist, don't alter them
+    <br/>(and display error message)
+
+- `kubectl apply -f whatever.yaml`
+
+  - creates resources if they don't exist
+
+  - if resources already exist, update them
+    <br/>(to match the definition provided by the YAML file)
+
+  - stores the manifest as an *annotation* in the resource
+
+---
+
+## Creating multiple resources
+
+- The manifest can contain multiple resources separated by `---`
+
+```yaml
+ kind: ...
+ apiVersion: ...
+ metadata: ...
+   name: ...
+ ...
+ ---
+ kind: ...
+ apiVersion: ...
+ metadata: ...
+   name: ...
+ ...
+```
+
+---
+
+## Creating multiple resources
+
+- The manifest can also contain a list of resources
+
+```yaml
+ apiVersion: v1
+ kind: List
+ items:
+ - kind: ...
+   apiVersion: ...
+   ...
+ - kind: ...
+   apiVersion: ...
+   ...
+```
+
+---
+
+## Deploying dockercoins with YAML
+
+- We provide a YAML manifest with all the resources for Dockercoins
+
+  (Deployments and Services)
+
+- We can use it if we need to deploy or redeploy Dockercoins
+
+.exercise[
+
+- Deploy or redeploy Dockercoins:
+  ```bash
+  kubectl apply -f ~/container.training/k8s/dockercoins.yaml
+  ```
+
+]
+
+(If we deployed Dockercoins earlier, we will see warning messages,
+because the resources that we created lack the necessary annotation.
+We can safely ignore them.)
+

slides/kube-fullday.yml

@@ -23,7 +23,7 @@ chapters:
   - shared/prereqs.md
   #- shared/webssh.md
   - shared/connecting.md
-  - k8s/versions-k8s.md
+  #- k8s/versions-k8s.md
   - shared/sampleapp.md
   #- shared/composescale.md
   #- shared/hastyconclusions.md
@@ -42,17 +42,18 @@ chapters:
   #- k8s/buildshiprun-selfhosted.md
   - k8s/buildshiprun-dockerhub.md
   - k8s/ourapponkube.md
-  #- k8s/kubectlproxy.md
-  #- k8s/localkubeconfig.md
-  #- k8s/accessinternal.md
 -
-  - k8s/setup-k8s.md
+  - k8s/yamldeploy.md
+  #- k8s/setup-k8s.md
   - k8s/dashboard.md
   #- k8s/kubectlscale.md
   - k8s/scalingdockercoins.md
   - shared/hastyconclusions.md
   - k8s/daemonset.md
   #- k8s/dryrun.md
+  #- k8s/kubectlproxy.md
+  #- k8s/localkubeconfig.md
+  #- k8s/accessinternal.md
   - k8s/rollout.md
   #- k8s/healthchecks.md
   #- k8s/healthchecks-more.md

slides/kube-selfpaced.yml

@@ -43,16 +43,17 @@ chapters:
   - k8s/buildshiprun-dockerhub.md
   - k8s/ourapponkube.md
 -
-  - k8s/kubectlproxy.md
-  - k8s/localkubeconfig.md
-  - k8s/accessinternal.md
+  - k8s/yamldeploy.md
   - k8s/setup-k8s.md
   - k8s/dashboard.md
   #- k8s/kubectlscale.md
   - k8s/scalingdockercoins.md
   - shared/hastyconclusions.md
   - k8s/daemonset.md
   - k8s/dryrun.md
+  - k8s/kubectlproxy.md
+  - k8s/localkubeconfig.md
+  - k8s/accessinternal.md
 -
   - k8s/rollout.md
   - k8s/healthchecks.md