Update docs/tech_docs/linux/KVM-virtualization-setup.md

docs/tech_docs/linux/KVM-virtualization-setup.md

@@ -1,3 +1,79 @@
+Sure, here's a condensed version with two sections: a step-by-step guide and a list of helpful commands.
+
+**Step-by-Step Guide**
+
+1. **Create the first bridge network (br-my-lan0) for Kubernetes DEV**
+```
+sudo ip link add name br-my-lan0 type bridge
+sudo ip addr add 10.154.2.1/24 dev br-my-lan0
+sudo ip link set dev br-my-lan0 up
+```
+
+2. **Create the second bridge network (br-my-lan1) for Docker DEV**
+```
+sudo ip link add name br-my-lan1 type bridge
+sudo ip addr add 172.50.50.1/24 dev br-my-lan1
+sudo ip link set dev br-my-lan1 up
+```
+
+3. **Persist the connections**
+```
+sudo vi /etc/sysconfig/network-scripts/ifcfg-br-my-lan0
+```
+Add the following:
+```
+DEVICE=br-my-lan0
+TYPE=Bridge
+BOOTPROTO=static
+IPADDR=10.154.2.1
+NETMASK=255.255.255.0
+ONBOOT=yes
+```
+
+```
+sudo vi /etc/sysconfig/network-scripts/ifcfg-br-my-lan1
+```
+Add the following:
+```
+DEVICE=br-my-lan1
+TYPE=Bridge
+BOOTPROTO=static
+IPADDR=172.50.50.1
+NETMASK=255.255.255.0
+ONBOOT=yes
+```
+
+4. **Restart NetworkManager**
+```
+sudo systemctl restart NetworkManager
+```
+
+**Helpful Commands**
+
+**Network Verification Commands**
+- `ip a` - Show IP addresses and network interfaces
+- `ping <IP_address>` - Test connectivity to a specific IP address
+- `traceroute <IP_address>` - Trace the route to a specific IP address
+- `mtr <IP_address>` - Combine traceroute and ping functionalities
+
+**Common Network Commands**
+- `ifconfig` - View and configure network interfaces
+- `netstat` - Display network connections, routing tables, and more
+- `route` - Manage routing tables
+- `iptables` - Configure firewall rules
+- `nmap` - Network exploration and security auditing
+
+**Advanced Network Commands**
+- `tcpdump` - Network packet capture and analysis
+- `wireshark` - Graphical network protocol analyzer
+- `ncat` - Versatile network debugging and data transfer tool
+- `iperf` - Network performance measurement tool
+- `lsof` - List open files, including network connections
+
+These commands can help you verify network configurations, troubleshoot issues, and perform advanced network analysis and debugging tasks.
+
+---
+
 ### 1. Folder Structure Best Practices
 For a well-organized virtualization environment, consider the following directory structure: