Add docs for environment variables

.env.example

@@ -1,4 +1,4 @@
 ARGOS_YAML_FILE = "my-config.yaml"
 ARGOS_DATABASE_URL = "postgresql://argos:argos@localhost/argos"
-DB_POOL_SIZE = 10
+DB_POOL_SIZE = 10 # https://docs.sqlalchemy.org/en/20/core/pooling.html#sqlalchemy.pool.QueuePool.params.pool_size
 DB_MAX_OVERFLOW = 20

docs/cli.md

@@ -46,10 +46,10 @@ Usage: argos agent [OPTIONS] SERVER AUTH
 
   Usage: argos agent https://argos.server "auth-token-here"
 
-  Alternatively, you can use the following environment variables to avoid passing
-  arguments to the agent on the command line:
-      ARGOS_AGENT_SERVER_URL=https://argos.server
-      ARGOS_AGENT_TOKEN=auth-token-here
+  Alternatively, you can use the following environment variables to avoid
+  passing arguments to the agent on the command line:
+  ARGOS_AGENT_SERVER_URL=https://argos.server     ARGOS_AGENT_TOKEN=auth-token-
+  here
 
 Options:
   --max-tasks INTEGER             Number of concurrent tasks this agent can run
@@ -75,8 +75,8 @@ Options:
   --help  Show this message and exit.
 
 Commands:
-  clean  Clean the database (to run routinely)
-  start  Starts the server.
+  cleandb  Clean the database (to run routinely)
+  start    Starts the server.
 ```
 
 <!--[[[end]]]
@@ -94,11 +94,11 @@ Usage: argos server start [OPTIONS]
   Starts the server.
 
 Options:
-  --host TEXT        Host to bind
-  --port INTEGER     Port to bind
-  --reload           Enable hot reloading
-  --log-config TEXT  Path to the logging configuration file
-  --help             Show this message and exit.
+  --host TEXT     Host to bind
+  --port INTEGER  Port to bind
+  --config TEXT   Path the the configuration file
+  --reload        Enable hot reloading
+  --help          Show this message and exit.
 ```
 
 <!--[[[end]]]
@@ -111,7 +111,7 @@ Options:
 .. ]]] -->
 
 ```man
-Usage: argos server clean [OPTIONS]
+Usage: argos server cleandb [OPTIONS]
 
   Clean the database (to run routinely)
 
@@ -119,7 +119,7 @@ Usage: argos server clean [OPTIONS]
   been locked for too long.
 
 Options:
-  --max-results INTEGER       Maximum number of results to keep
+  --max-results INTEGER       Number of results per tasks to keep
   --max-lock-seconds INTEGER  The number of seconds after which a lock is
                               considered stale
   --help                      Show this message and exit.

docs/configuration.md

@@ -13,6 +13,33 @@ caption: .env
 ---
 ```
 
+### Environment variables
+
+Here are the environment variables you can define to configure how the service will behave :
+
+#### ARGOS_YAML_FILE
+
+The path to the yaml configuration file, defining the checks.
+
+#### ARGOS_DATABASE_URL
+
+The database url, as defined [in SQLAlchemy docs](https://docs.sqlalchemy.org/en/20/core/engines.html#database-urls).
+
+For instance, to connect to a postgres database on localhost with user, pass and dbname "argos":
+
+```
+ARGOS_DATABASE_URL = "postgresql://argos:argos@localhost/argos"
+```
+
+#### DB_POOL_SIZE
+#### DB_MAX_OVERFLOW
+
+These two help you configure the size of the pool, and the max overflow (until when do we accept a new connection ?) These are documented [in the SQLAlchemy docs in greater details](https://docs.sqlalchemy.org/en/20/core/pooling.html#sqlalchemy.pool.QueuePool.params.pool_size)
+
+```bash
+DB_POOL_SIZE = 10
+DB_MAX_OVERFLOW = 20
+```
 
 ## Checks configuration