OneideLuizSchneider · OneideLuizSchneider · Sep 9, 2024 · Sep 11, 2024 · Sep 12, 2024 · Sep 12, 2024
diff --git a/05-SERVICE.md b/05-SERVICE.md
@@ -14,7 +14,8 @@ Create it:
 - `k aplly -f svc-definition.yml`
 
 Expose a pod:
-- `kubectl expose pod nginx --port=80 --name nginx-service --type=ClusterIP`
+- `kubectl expose pod nginx --port=80 --name nginx-service`
+  - `--type=ClusterIP` is default, and `--target-port=` will the same as `--port=` is you don't set it
 
 To see more details of the a POD:
 - `k get po -o wide`
diff --git a/06-COMMANDS-ARGUMENTS.md b/06-COMMANDS-ARGUMENTS.md
@@ -29,6 +29,9 @@ Run POD with command and arguments:
         - "5000"
   ```
 
+Or just:
+- `k run ubuntu --image=ubuntu --command sleep 5000`
+
 Obs.:
 - The tag `command` is will overwrite the tag `ENTRYPOINT` from Dockerfile.
 - The tag `args` is will overwrite the tag `CMD` from Dockerfile.

diff --git a/09-SECURITY-CONTEXT.md → 09-SERVICE-ACCOUNT.md b/09-SECURITY-CONTEXT.md → 09-SERVICE-ACCOUNT.md
@@ -1,16 +1,15 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
+## Service Account
 
-Get all service accounts:
+- Get all service accounts:
   ```
   k get sa -A
   ```
 
-Service Account for the POD:
+- Service Account for the POD:
   ```
   k create serviceaccount my-sa
   ```
-To get the name of the token to see the value of the token:
+- To get the name of the token to see the value of the token:
   ```
   k describe serviceaccount my-sa
   k describe secret my-sa-token-kbbdm

diff --git a/10-SERVICE-ACCOUNT.md → 10-SECURITY-CONTEXT.md b/10-SERVICE-ACCOUNT.md → 10-SECURITY-CONTEXT.md
@@ -1,5 +1,3 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
 
 Security Context for the POD:
   ```
@@ -52,4 +50,9 @@ Security Context for the Container with capabilities:
   ```
 
 To see more details of the a POD:
-- `k get po -o wide`
+- `k get po -o wide`
+
+---
+
+Doc:
+- <https://kubernetes.io/docs/tasks/configure-pod-container/security-context/>
diff --git a/11-RESOURCE-LIMITS.md b/11-RESOURCE-LIMITS.md
@@ -1,5 +1,3 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
 
 Limite resorces for all the PODS in default NS:
   ```

diff --git a/12-TAINTS.md b/12-TAINTS.md
@@ -1,5 +1,3 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
 
 Create a taint
 - `k taint nodes node-name key=value:taint-effect`

diff --git a/13-NODE-SELECTORS.md b/13-NODE-SELECTORS.md
@@ -1,5 +1,3 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
 
 Create a label
 - `k label nodes node1 app=ssd`

diff --git a/14-NODE-AFFINITY.md b/14-NODE-AFFINITY.md
@@ -1,5 +1,3 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
 
 Show all labels on the nodes:
 - `k get nodes --show-labels`

diff --git a/15-MILTI-CONTAINER-PODS.md b/15-MILTI-CONTAINER-PODS.md
@@ -1,26 +1,75 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
+#### Sidecar containers
+
+- Here's an example of a Deployment with two containers, one of which is a sidecar:
+
+  ```
+  apiVersion: apps/v1
+  kind: Deployment
+  metadata:
+    name: myapp
+    labels:
+      app: myapp
+  spec:
+    replicas: 1
+    selector:
+      matchLabels:
+        app: myapp
+    template:
+      metadata:
+        labels:
+          app: myapp
+      spec:
+        containers:
+          - name: myapp
+            image: alpine:latest
+            command: ['sh', '-c', 'while true; do echo "logging" >> /opt/logs.txt; sleep 1; done']
+            volumeMounts:
+              - name: data
+                mountPath: /opt
+        initContainers:
+          - name: logshipper
+            image: alpine:latest
+            restartPolicy: Always
+            command: ['sh', '-c', 'tail -F /opt/logs.txt']
+            volumeMounts:
+              - name: data
+                mountPath: /opt
+        volumes:
+          - name: data
+            emptyDir: {}
+  ```
+
+- Two containers in a POD and sharing a volume, different mounthPaths but the same shared folder:
 
-Add a Label on a POD:
   ```
   apiVersion: v1
   kind: Pod
   metadata:
-    name: nginx-pod
+    name: two-containers
   spec:
+
+    volumes:
+    - name: shared-data
+      emptyDir: {}
+
     containers:
-    - image: nginx
-      name: nginx-container
-    affinity:
-      nodeAffinity:
-        requiredDuringSchedulingIgnoredDuringExecution:
-          nodeSelectorTerms:
-          - matchExpressions:
-            - key: app
-              operator: In
-              values:
-              - ssd
+
+    - name: nginx-container
+      image: nginx
+      volumeMounts:
+      - name: shared-data
+        mountPath: /usr/share/nginx/html
+
+    - name: debian-container
+      image: debian
+      volumeMounts:
+      - name: shared-data
+        mountPath: /pod-data
+      command: ["/bin/sh"]
+      args: ["-c", "echo Hello from the debian container > /pod-data/index.html"]
   ```
 
-To see more details of the a POD:
-- `k get po -o wide`
+---
+
+Doc:
+- <https://kubernetes.io/docs/concepts/workloads/pods/>
diff --git a/16-READNESS-LIVENESS.md b/16-READNESS-LIVENESS.md
@@ -1,5 +1,3 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
 
 Add livenessProbe and readinessProbe on a POD:
   ```

diff --git a/17-LOGGING.md b/17-LOGGING.md
@@ -1,5 +1,3 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
 
 Show the POD logs:
 - `k logs pod-name`

diff --git a/18-MONITORING.md b/18-MONITORING.md
@@ -1,7 +1,5 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
 
-Go to github and install metrics-server:
+Go to github and install metrics-server(If needed):
 - `https://github.com/kubernetes-sigs/metrics-server`
 
 Get Nodes metrics:

diff --git a/19-POD-LABELS.md b/19-POD-LABELS.md
@@ -1,8 +1,4 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
-
-Documentation:
-- https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/
+#### Labels
 
 Add two labels on a POD:
   ```
@@ -23,3 +19,9 @@ Add two labels on a POD:
 
 Get Pods by labels:
 - `k get pods -l environment=production,tier=frontend`
+
+
+---
+
+Doc:
+- https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/
diff --git a/20-LABELS-SELECTORS.md b/20-LABELS-SELECTORS.md
@@ -1,5 +1,3 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
 
 Get Nodes metrics:
 - `k get pods --selector app=app1`

diff --git a/21-ROLLING-UPDATES-AND-ROLLBACKS.md b/21-ROLLING-UPDATES-AND-ROLLBACKS.md
@@ -1,5 +1,3 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
 
 Deployment Strategys:
 - Recreate

diff --git a/22-JOBS-CRONJOBS.md b/22-JOBS-CRONJOBS.md
@@ -1,5 +1,4 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
+#### CronJob - Jobs
 
 Add a JOB:
   ```

diff --git a/23-SERVICES.md b/23-SERVICES.md
@@ -1,5 +1,4 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
+#### Service
 
 Service NodePort:
   ```

diff --git a/24-INGRESS.md b/24-INGRESS.md
@@ -1,7 +1,5 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
-- `alias kdr='kubectl -o yaml --dry-run=client'`
-
+#### Ingress
+
 Install Nginx Ingress Controller Steps:
 - ConfigMap
   - `kdr create configmap nginx-configuration -n ingress-space > configmap.yml`

diff --git a/25-NETWORK-POLICIES.md b/25-NETWORK-POLICIES.md
@@ -1,8 +1,4 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
-
-Documentation:
-- https://kubernetes.io/docs/concepts/services-networking/network-policies/
+#### Network Policy
 
 NetworkPolicy example:
   ```
@@ -37,4 +33,9 @@ Create it:
 
 
 Obs.: ***Flannel*** does not support NetwotkPolicies.
-      But ***Kube-router, Calico, Romana, Weave-net*** does.
+      But ***Kube-router, Calico, Cilium...*** does support.
+
+---
+
+Doc:
+- <https://kubernetes.io/docs/concepts/services-networking/network-policies/>
diff --git a/26-VOLUMES-PV-PVC.md b/26-VOLUMES-PV-PVC.md
@@ -1,9 +1,4 @@
-How to create kubectl alias (optional):
-- `alias k=kubectl`
-
-Documentation:
-- https://kubernetes.io/docs/concepts/storage/volumes/
-- https://kubernetes.io/docs/concepts/storage/persistent-volumes/
+#### Persistent Volumes and PV. Claims
 
 Persistent Volumes:
   ```
@@ -60,10 +55,8 @@ POD:
           claimName: my-pvc
   ```
 
+---
 
-
-  volumes:
-  - name: default-token-qq6ns
-    secret:
-      defaultMode: 420
-      secretName: default-token-qq6ns
+Doc:
+- <https://kubernetes.io/docs/concepts/storage/volumes/>
+- <https://kubernetes.io/docs/concepts/storage/persistent-volumes/>
diff --git a/27 - HELM.md b/27 - HELM.md
@@ -0,0 +1,43 @@
+## Helm
+
+#### Install
+
+Go to <https://helm.sh/docs/intro/install/>
+
+#### Some commands
+
+- `helm search hub` searches the Artifact Hub, which lists helm charts from dozens of different repositories.
+- `helm search repo` searches the repositories that you have added to your local helm
+  ```
+  helm search repo wordpress
+  helm search hub wordpress
+  ```
+
+- Add a Repo:
+  ```
+  helm repo add bitname https://charts.bitnami.com/bitnami
+  helm repo update
+  ```
+
+- Search for a repo:
+  `helm search repo joomla`
+
+- List repositories:
+  `helm repo ls`
+
+- Env prints out all the environment info in use by Helm
+  `helm env`
+
+- Install App:
+  - `helm install <name> <chart>`
+  - Ex.: `helm install my-nginx stable/nginx-ingress`
+- Uninstall App:
+  - `helm uninstall <name>`
+  - Ex.: `helm uninstall my-nginx`
+- You can pass `--namespace my-namespace` as well
+
+- Pull and download:
+  - `helm pull <chart> --untar=true`
+
+Some Cheats:
+<https://helm.sh/docs/intro/cheatsheet/>