portchecker is a simple application to check the port of host is connectable or not
portchecker [-constr connection string] [-env environment-variable-name] [-attempt maximum-attempt-times] [-wait connection-failed-waiting-time]
-constr connection string under test
example:
tcp://127.0.0.0.1:1234
postgres://localhost/test
mysql://testuser:password@mysql-host.local:1234
redis://localhost
-env environment variable name
example:
DB_URL
REDIS_URL
-attempt how many times to try, default: 5 times
-wait wait how many time to try next time, default: 3s