TJS-AJV


TJS-AJV is a handy tool that uses TJS to generate json schema from typescript interface, and uses AJV to validate a config file against the json schema. How to use TJS-AJV? Define your Interface file which will be used to dynamically generate the json schema. For example, the sample-schema.json schema file is generated from the typescript Interface sample-interface.ts by tjs-ajv.Define your config file, … Continue reading TJS-AJV →

Avoid EC2 Image Builder Remove SSM Agent


We use EC2 Image Builder to build both Amazon Linux 2 and Red Hat Enterprise Linux based AMI as our SOE. The Ansible playbook that is included in the component installs SSM agent, but somehow we could not connect to the EC2 instance that is created from the RHEL AMI SOE via ssm session manager. … Continue reading Avoid EC2 Image Builder Remove SSM Agent →

Two Examples of using AWS Network Firewall


AWS Network Firewall is a high-available and scalable firewall service that provides network protections for VPC, which is a supplement to the existing security services. Security group protects computing resources (EC2, Lambda, RDS...)NACL (Network Access Control List) protects subnetsWAF (Web Application Firewall) and Shield protects frontend resources (ELB, CloudFound, API Gateway) There are quite a … Continue reading Two Examples of using AWS Network Firewall →

Yum gets ‘HTTPS Error 403 – Forbidden’ error in Amazon Linux 2


If you use S3 endpoint not NAT/Proxy to access the Amazon yum repository, then this post should be helpful to you. We use S3 endpoint to access Amazon repositories, and we noticed that any yum operations failed with the 'HTTPS Error 403 - Forbidden' error in the EC2 instances that are launched from the latest … Continue reading Yum gets ‘HTTPS Error 403 – Forbidden’ error in Amazon Linux 2 →