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Before going through this blog, I would like to inform that this blog is reposted from a technical blog that I have read. Please enjoy the content and this blog is not commercial. How Karpenter Works Karpenter is a fairly new autoscaler, , claimed as “Just In Time Nodes” for Any Kubernetes Cluster. Currently Karpenter just support AWS and A... Read More

Introduction We often need to configure IP (static or dynamic), especially on newly installed Ubuntu. However, since we have not systematically summarized this, this makes our memory always a little confused, but it’s actually very simple. Here’s how to get networking all the way up in a matter of seconds using just a few commands from the ter... Read More

Introduction If you are a user who often deals with terminals, you must have noticed that the output ends a line with a highlighted percent symbol on occasion with a variety of applications. Maybe you would think it was because the output was cancelled early (ctrl+c, for example) or something similar, but it doesn’t seem to do this in bash, jus... Read More

What’s up? Recently, I encountered a weird problem. When I used SSH to connect to a Linux server, the connection was immediately interrupted, and such a message appeared: free(): invalid next size (fast), screenshot as below image: Troubleshooting After that, I tried to connect using another Linux computer and still had the same problem. Bu... Read More

MD-family The MD family of hashing algorithms were designed by Ron Rivest during the late 1980’s and early 1990’s. MD actually stands for “Message Digest”. MD2 It was optimized to run on 8-bit computers and generates a 128-bit hash value the hashes are generally displayed as hexadecimal string which is 32 characters long. This hash exhibits f... Read More

With steps same as previous docs: Setup kubernetes without Ansible, we can automatically configure k8s cluster. Please checkout git repository: Setup kubernetes cluster with Ansible Read More

How to setup Kubernetes cluster with the AWS EC2 nodes RHEL/CentOS OS and without Ansible? In this blog, I will introduce you about installing Kubernetes cluster in REHL7 OS. Prerequisite kubeadm docker/containerd (container runtime) kubectl Install kubeadm, kubectl, kubelet In almose cases, all you guys only want install specific kube... Read More

Install Pritunl Prepare a EC2 machine with security group, key pair to authenticate when SSH, VPC, Public subnet, target group. Bootstrap script below: #!/bin/bash sudo apt update -y sudo apt upgrade -y echo "deb http://repo.pritunl.com/stable/apt bionic main" | sudo tee /etc/apt/sources.list.d/pritunl.list echo "deb https://repo.mongodb.org/ap... Read More

Table Path Type Scope Description /etc/locale.conf File Global Global locale /etc/security/limits.conf File Global Global limits for a user /etc/environment File Global Global environment variables ... Read More

Table As Bash use Emacs mode, here’s a table of the shortcuts in Bash. Shortcuts Description ctrl-a Go to the start of a line (Home) ctrl-e Go to the end of a line (End) ctrl-u Delete from cursor to the start of a line ctrl-k Dele... Read More