Skip to main content

networking in kubernetes

let us start with single node kubernetes cluster

node has an IP 192.168.1.2
if this is minikube then we talking about minikube virtual machine inside your hypervisor

unlike dockers where IP address is assigned to dockers, in kubernetes IP address is assigned to Pods

so when kubernetes is initially configured we create an internal private network with the address.

10.244.0.0 and all pods are attached to it.
when we deploy pods they all get a separate ip address.

The pods can communicate to each other using this internal ip address bt accessing this ip address for any work may not be a good idea as its subject to change when pods are recreated.

Its kinda easy to understand networking on a single cluster but how does it work when there are multiple nodes

Comments

Popular posts from this blog

Gui logging in node js and python

For node.js Use  frontail for logging https://www.npmjs.com/package/frontail For Python -- use Cutelog https://pypi.org/project/cutelog/ In NodeJs for using frontail we need to use log the logs in a file for logging logs to file , we will use winston Using winston https://www.npmjs.com/package/winston Eg. of using winstonconst { createLogger, format, transports } = require('winston'); const { combine, timestamp, label, prettyPrint } = format; const logger = createLogger({   level: 'info',   format: format.json(),   transports: [     //     // - Write to all logs with level `info` and below to `combined.log`      // - Write all logs error (and below) to `error.log`.     //     new transports.File({ filename: 'error.log', level: 'error' }),     new transports.File({ filename: 'combined.log' })   ] }); logger.log({   level: 'info',   message: 'What time is...

fork and sync a github project to bitbucket

First create an empty repository on Bitbucket. Then clone it locally git clone git@bitbucket.org:benlongstaff/forked-repo.git cd forked-repo Now add Github repo as a new remote in Bitbucket called “sync” git remote add sync git@github.com:something/original-repo.git Verify the remotes, it should look something like Summer:forked-repo benlongstaff$ git remote -v origin git@bitbucket.org:benlongstaff/forked-repo.git (fetch) origin git@bitbucket.org:benlongstaff/forked-repo.git (push) sync git@github.com:something/original-repo.git (fetch) sync git@github.com:something/original-repo.git (push) Pull from the master branch in the sync remote. git pull sync master Setup a local branch to track the sync remote’s master branch git branch --track github-master sync/master Push the local master branch to the origin remote in Bitbucket. git push -u origin master To merge in changes from the original repo pull them down into the  github-master  branch and then rebas...

opening multiple ports tunnels ngrok in ubuntu

Location for the config yml file /home/example/.ngrok2/ngrok.yml content of config file authtoken: 4nq9771bPxe8ctg7LKr_2ClH7Y15Zqe4bWLWF9p tunnels: app-foo: addr: 80 proto: http host_header: app-foo.dev app-bar: addr: 80 proto: http host_header: app-bar.dev how to start ngrok with considering the config file: ngrok start --all