This is a small article about understanding the liveness, readiness and startup in kubernetes. There's good explanation in the kubernetes documentation: https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/ This video also explains well the process: https://www.youtube.com/watch?v=aTlQBofihJQ But I wanted to understand it in a practical way. So I have this demo: https://github.com/DiegoTc/guest-book-js-docker/tree/Running-App-Version-1 It's a simple application running on a kubernetes cluster. https://github.com/DiegoTc/guest-book-js-docker/blob/Running-App-Version-1/argo/deployment.yaml apiVersion: apps/v1 kind: Deployment metadata: name: chat-ui spec: replicas: 1 revisionHistoryLimit: 3 selector: matchLabels: app: chat-ui template: metadata: labels: app: chat-ui spec: containers: - image: diegotc/guestbook:20230803-064434 imagePullPolicy: Alwa...
Sometimes, we want to know how many devices are connected to our network. With any Unix OS you get easily know this. For this small tutorial we´re going to use Lubuntu 16.04. We will use nmap. Nmap (Network Mapper) is a security scanner. It is used to discover hosts and services on a computer network. For installing it, we first do sudo apt-get install nmap If we just need to identify the host names sudo nmap -sL 192.168.0.1/24 The result of this command will be Starting Nmap 7.01 ( https://nmap.org ) at 2016-10-02 12:39 CST Nmap scan report for 192.168.0.0 Nmap scan report for 192.168.0.1 Nmap scan report for 192.168.0.2 Nmap scan report for 192.168.0.3 Nmap scan report for 192.168.0.4 Nmap scan report for 192.168.0.5 If we need to know the OS of the devices we have connected we do a: sudo nmap -O 192.168.0.1/24 The address 192.188.0.1 depends of your network, you should do a ifconfig for knowing yours. The result of this command will be something l...