How to create a react application and push in a new Git repo?

Create a repo called my-app in Github
npx create-react-app my-app --template typescript
git remote add origin https://github.com/<YOUR-GIT-NAME>/my-app.git
Control panel --> Credential manager --> Windows credentials --> remove all Git credentials (otherwise, you will get 403)
git config user.name "<YOUR-NAME>"
git config user.email <EMAIL-ADDRESS>
git config -e
git checkout -b main
git branch -D master
git branch
git fetch origin main
git pull origin main --allow-unrelated-histories
Fix all merge conflicts through VS Code
git commit
git push --set-upstream origin main

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How to install/upgrade/downgrade kubectl in Linux (Ubuntu)?

To install the latest version: curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" curl -LO "https://dl.k8s.io/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl.sha256" echo "$(<kubectl.sha256) kubectl" | sha256sum --check sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl kubectl version --client kubectl version To install a specific (v1.19.0) version: curl -LO "https://dl.k8s.io/release/v1.19.0/bin/linux/amd64/kubectl" curl -LO "https://dl.k8s.io/v1.19.0/bin/linux/amd64/kubectl.sha256" echo "$(<kubectl.sha256) kubectl" | sha256sum --check sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl kubectl version --client kubectl version This will install kubectl client. Run minikube start to install kubectl server.

High availability (Multi-AZ) for Amazon RDS

There is something called failover technology in Amazon. AWS RDS's Multi-AZ deployment uses this technology. If you enable Multi-AZ for an RDS DB, say MySQL DB, RDS automatically creates a standby replica in a different AZ. If the primary DB instance is in AZ-1A, then RDS creates a standby replica in AZ-1B (for example). Suppose I add a new row to a table in the primary DB, then the same row is added, almost in the same time, in the standby replica. This is called as synchronous replication . Thus, standby replicas are useful during DB instance failure/ AZ disruption . How? Because, there is no need to create a backup later because the backup has already been created. This gives high availability during planned system maintenance. Normal backup operation - I/O activities are blocked in the primary database Automated backup operation (standby replica) - I/O activities are not blocked This standby replica is not similar to read replica (which is used for disaster recovery). S...

Application Load Balancer (ALB)

The ALB spans all subnets in a VPC i.e., it is not inside a subnet but VPC. ALB is bound to Target Groups (TGs). TGs are bound to subnets.

Ayyappu MK

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