Config-server

Config server is a golang proof of concept where environment settings are constantly updated. By executing this job the environment configuration should be always up to date without performing a new deployment.

Prerequisites

Docker and docker compose.

How does this POC keep everything up to date?

Config server uses Hashicorp Consul as service discovery and environment key-value pairs provider.

When the server starts it performs a polling job into consul getting services addresses and application service key-value pairs. In case of consul hit failure, it should try to get local environment variable with the same key.

How to run locally

1. Build an image by performing docker build -t config-server .

2. Inside docker-compose.yaml file you should be able to find commands into command key in config-server service. There is some params that may be passed to run the http server:

-n, --app-name string             Application name. (default "config-server")
--auto-refresh                    Refresh key-value pairs from consult integration. (default true)
--auto-refresh-duration int       Interval between key-value pairs refreshes in seconds. (default 5)
--consul-port string              Port to be used on consul. (default ":8500")
--consul-prefix string            Consul key value prefix. (default "config")
--consul-url string               Consul URL. (default "consul")
-h, --help                        help for http
-p, --port string                 Port to be used on http server. (default ":4040")

3. After filling up with the desired configuration, you may start the local environment by executing docker-compose up

4. You should be able to see logging config variables by config-server or getting them by performing a cURL to <local_config_server_address>:<local_config_server_port>. If you leave the default values, the config-server address should be localhost:4040 and the consul ui address localhost:8500.

5. Insert some key-value pairs into consul. If you leave the default values, you should:

   • Access localhost:8500
   • Click on Key/Value nav bar option
   • Click on Create button
   • Insert config/config-server/<any_key> on Key or Folder input
   • Insert <any_value> into Value input
   • Click on Save button

6. Now you can see the config variable changing dynamically