make addr, approle optional field in readme

README.md

@@ -55,7 +55,7 @@ If your configuration is right and Vault is running on the same host as the agen
 
 ## Configuration
 
-`addr` The address of the Vault cluster.  This is used to check the Vault cluster leader IP, as well as generate snapshots.
+`addr` The address of the Vault cluster.  This is used to check the Vault cluster leader IP, as well as generate snapshots. Defaults to "http://127.0.0.1:8200".
 
 `retain` The number of backups to retain.
 
@@ -65,7 +65,7 @@ If your configuration is right and Vault is running on the same host as the agen
 
 `secret_id` Specifies the secret_id used to call the Vault API.
 
-`approle` Specifies the approle name used to login.
+`approle` Specifies the approle name used to login.  Defaults to "approle".
 
 ### Storage options
 

main.go

@@ -35,14 +35,15 @@ func main() {
 	}
 
 	snapshotter, err := snapshot_agent.NewSnapshotter(c)
+	if err != nil {
+		log.Fatalln("Cannot instantiate snapshotter.", err)
+	}
 	frequency, err := time.ParseDuration(c.Frequency)
 
 	if err != nil {
 		frequency = time.Hour
 	}
-	if err != nil {
-		log.Fatalln("Error retrieving Current instance IP.  Verify internet connectivity.")
-	}
+
 	for {
 		if snapshotter.TokenExpiration.Before(time.Now()) {
 			snapshotter.SetClientTokenFromAppRole(c)
@@ -94,4 +95,4 @@ func logSnapshotError(dest, snapshotPath string, err error) {
 	} else {
 		log.Printf("Successfully created %s snapshot to %s\n", dest, snapshotPath)
 	}
-}
+}

snapshot_agent/agent.go

@@ -58,7 +58,9 @@ func NewSnapshotter(config *config.Configuration) (*Snapshotter, error) {
 
 func (s *Snapshotter) ConfigureVaultClient(config *config.Configuration) error {
 	vaultConfig := vaultApi.DefaultConfig()
-	vaultConfig.Address = config.Address
+	if config.Address != "" {
+		vaultConfig.Address = config.Address
+	}
 	tlsConfig := &vaultApi.TLSConfig{
 		Insecure: true,
 	}