Case 1. “/whatis”: a slack command server
Business: When Slack users input a command like “/whatis GDPR”, search on wiki pages and respond in 3 seconds what GDPR is.
Generation 1. servers on machines
ElasticSearch: to respond in less than a second
Ngrok: to pierce the private network
Gen 2. containerized
Docker: to make deployments reliable
Gen 3. Cloud (AWS EC2 + Amazon ElasticSearch Service)
To get rid of on-premise server room, which occasionally suffers from power outages.
EC2: a drop-in replacement of bare metals
AWS ElasticSearch Service: a drop-in replacement of Elastic Search servers
Gen 4. Serverless (AWS API Gateway + AWS Lambda + EventBridge)
To get rid of EC2, which is occasionally stopped and need to manually restart and change slack configurations
API Gateway: ingress gateway; authentication
Lambda: pay-as-you-go; fast cold-starts
EventBridge: cron jobs
Case 2. “GODIVA”: Go Dependency Visualizer
Business: A static site, internal network access only
Generation 1. Nginx + Docker + static files
Nginx: to host a static site.
Docker: to make deployments reliable
Gen 2. Cloud
To get rid of BJO server room, which occasionally suffers from power outages.
Route 53: a DNS to resolve host to EC2’s ip
EC2: to migrate from bare metals
Gen 3. API Gateway + S3
To get rid of EC2, which is occasionally stopped and need to manually restart.
Route 53: a DNS to resolve host to API Gateway’s execution endpoint
API Gateway: ingress gateway; authentication
S3 files: a drop-in replacement of local files