modified: README.md

README.md

@@ -4,6 +4,8 @@ Kubernetes is an open‑source platform that automates the deployment, scaling,
 
 - [k3s](#k3s)
   - [Install / Setup](#install--setup)
+- [Kubernetes DNS](#kubernetes-dns)
+  - [Services DNS Name](#services-dns-name)
 - [kubectl](#kubectl)
   - [Pod delete](#pod-delete)
   - [OOMKilled](#oomkilled)
@@ -32,10 +34,28 @@ K3s is a lightweight, certified Kubernetes distribution designed to run in resou
 curl -sfL https://get.k3s.io | sh -
 ```
 
+## Kubernetes DNS
+
+**Automatic DNS Records:** Kubernetes automatically creates DNS entries for Services and Pods. This allows workloads to connect using predictable names instead of IPs, which may change.
+
+### Services DNS Name
+
+```text
+<service-name>.<namespace>.svc.<cluster-domain>
+```
+
+*Example: [test-services.services.svc.cluster.local](test-services.services.svc.cluster.local).*
+
 ## kubectl
 
 kubectl is the command‑line tool used to interact with Kubernetes clusters. Think of it as the “remote control” for Kubernetes: it lets you deploy applications, inspect resources, and manage cluster operations directly from your terminal.
 
+**Create namespace:**
+
+``` bash
+ kubectl create namespace tests 
+```
+
 ### Pod delete
 
 **Restart local Path Provizionizer:**
@@ -79,17 +99,48 @@ kubectl get crds | grep traefik
 #### network testing
 
 ``` bash
- kubectl run -i --tty dns-test --image=busybox --restart=Never -- 
+kubectl run  -i --tty dns-test --namespace tests --image=busybox --restart=Never -- 
-# Inside the pod:
+kubectl delete pod dns-test --namespace tests || 0
-nslookup google.com
 ```
 
-**from inside the pod:**
+**Example using yaml and hostNetwork:**
+
+- Create Pod
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: dns-test
+  namespace: tests
+spec:
+  hostNetwork: true
+  containers:
+  - name: dns-test
+    image: busybox
+    command: ["sh"]
+    stdin: true
+    tty: true
+```
+
+- Attach to Pod
+
+```bash
+kubectl attach -it dns-test -n tests
+```
+
+- Execute command inside pod.
 
 ``` bash
 nslookup google.com
 ```
 
+- Delete pod
+
+```bash
+kubectl delete pod dns-test --namespace tests
+```
+
 ### Set Replicas
 
 **Set deployment replicas to 0:**