https://github.com/viveksinghggits/cross-nwnamespace-communication
This repository contains commands and code for the YouTube video where I talked about cross network namespace communication.
https://github.com/viveksinghggits/cross-nwnamespace-communication
kubernetes kubernetes-networking linux-networking
Last synced: 4 months ago
JSON representation
This repository contains commands and code for the YouTube video where I talked about cross network namespace communication.
- Host: GitHub
- URL: https://github.com/viveksinghggits/cross-nwnamespace-communication
- Owner: viveksinghggits
- Created: 2023-03-19T11:28:32.000Z (over 2 years ago)
- Default Branch: master
- Last Pushed: 2023-03-19T11:35:49.000Z (over 2 years ago)
- Last Synced: 2025-02-22T13:04:36.642Z (4 months ago)
- Topics: kubernetes, kubernetes-networking, linux-networking
- Language: Go
- Homepage: https://youtu.be/6zgHhEpnTGI
- Size: 1.95 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
## Create server ns and run server into that ns
```bash
sudo ip netns add serverns
# show all the network namespaces
ls -l /var/run/netns
# or
ip netns ls
# run server into the server namespace
sudo ip netns exec serverns ./server
./client
Requesting http://localhost:8080/serve
2023/03/18 12:47:56 Error Get "http://localhost:8080/serve": dial tcp 127.0.0.1:8080: connect: connection refused, getting localhost
# create client network ns and run client there
sudo ip netns add clientns
sudo ip netns exec client ./client
```
## Draw diagram to explain how we are going to create virt network interface to make the connection work
```bash
sudo ip netns exec clientns ip link
1: lo: mtu 65536 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
sudo ip netns exec serverns ip link
1: lo: mtu 65536 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
```
## Create veth virtual ethernet network interface to conenct them
```bash
sudo ip link add pair-c type veth peer name pair-s
# run ip link to list all the network interfaces on the machine
ip link
```
## Move one end of the pair to server and another end to client ns
```bash
sudo ip link set pair-c netns clientns
# list network interfaces again from server and client to see new interface has been added
sudo ip netns exec serverns ip link
1: lo: mtu 65536 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
15: pair-s@if16: mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether 46:11:c5:37:34:42 brd ff:ff:ff:ff:ff:ff link-netns clientns
```
## Assign IP address to the virtual interfaces
```bash
sudo ip netns exec clientns ip addr add 10.0.0.1/24 dev pair-c
sudo ip netns exec serverns ip addr add 10.0.0.2/24 dev pair-s
```
## Change the status to up
```
sudo ip netns exec serverns ip link set dev pair-s up
```
## Show the connectivity
```bash
# start server
sudo ip netns exec serverns ./server
# run client
sudo ip netns exec clientns ./client -server 10.0.0.2
Requesting http://10.0.0.2:8080/serve
Hello World!!!
```