Architecture diagram makerfrom plain language, free.

architecture-beta
  service users(internet)[Users]
  service dns(internet)[DNS]
  group cloud(cloud)[Cloud]
  group publicNet(cloud)[Public subnet] in cloud
  group privateNet(cloud)[Private subnet] in cloud
  service lb(server)[Load balancer] in publicNet
  junction fan in privateNet
  service api1(server)[API 1] in privateNet
  service api2(server)[API 2] in privateNet
  service cache(database)[Redis cache] in privateNet
  service db(database)[Postgres] in privateNet
  service storage(disk)[Object storage] in cloud
  users:R --> L:dns
  dns:R --> L:lb
  lb:R -- L:fan
  fan:T --> B:api1
  fan:B --> T:api2
  api1:R --> L:db
  api2:R --> L:cache
  cache:T --> B:db
  db:R --> L:storage