# Configuration Actually, everything available as a CLI parameter can also be specified via environment variables, so they're not specifically mentioned in most cases (see `--help` also). If you prefer a config file you can use it in yaml format. ## Nodes and weights You can specify multiple `-p` options to add more NeoFS nodes; this will make a gateway spread requests equally among them (using weight 1 for every node): ``` $ neofs-s3-gw -p 192.168.130.72:8080 -p 192.168.130.71:8080 ``` If you want some specific load distribution proportions, use weights, but keep it in mind that they can only be specified via environment variables: ``` $ S3_GW_PEERS_0_ADDRESS=192.168.130.72:8080 S3_GW_PEERS_0_WEIGHT=9 \ S3_GW_PEERS_1_ADDRESS=192.168.130.71:8080 S3_GW_PEERS_1_WEIGHT=1 neofs-s3-gw ``` This command will make gateway use 192.168.130.72 for 90% of the requests and 192.168.130.71 for the remaining 10%. ## Key Wallet (`--wallet`) is a mandatory parameter. It is a path to a wallet file. You can provide password to decrypt a wallet via `S3_GW_WALLET_PASSPHRASE` variable or you will be asked to enter a password interactively. You can also specify an account address to use from a wallet using `--address` parameter. ## Binding and TLS Gateway binds to `0.0.0.0:8080` by default, and you can change that with `--listen_address` option. It can also provide TLS interface for its users, just specify paths to the key and certificate files via `--tls.key_file` and `--tls.cert_file` parameters. Note that using these options makes gateway TLS-only, if you need to serve both TLS and plain text you either have to run two gateway instances or use some external redirecting solution. Example to bind to `192.168.130.130:443` and serve TLS there (keys and nodes omitted): ``` $ neofs-s3-gw --listen_address 192.168.130.130:443 \ --tls.key_file=key.pem --tls.cert_file=cert.pem ``` ## Monitoring and metrics Pprof and Prometheus are integrated into the gateway, but not enabled by default. To enable them, use `--pprof` and `--metrics` flags or `S3_GW_PPROF`/`S3_GW_METRICS` environment variables. ## Yaml file Configuration file is optional and can be used instead of environment variables/other parameters. It can be specified with `--config` parameter: ``` $ neofs-s3-gw --config your-config.yaml ``` Configuration file example: ``` listen_address: 0.0.0.0:8084 wallet: passphrase: 123456 logger: level: debug peers: 0: address: s01.neofs.devenv:8080 weight: 1 ``` To know the nesting level of the variable, you need to cut off the prefix `S3_GW` from the variable and split the rest parts by `_`. For example, variable `S3_GW_PEERS_0_WEIGHT=1` will be transformed to: ``` peers: 0: weight: 1 ``` If a parameter doesn't support environment variable (e.g. `--listen_address 0.0.0.0:8084`) form, it is used as: ``` listen_address: 0.0.0.0:8084 ``` ### Default policy of placing containers in NeoFS If a user sends a request `CreateBucket` and doesn't define policy for placing of a container in NeoFS, the S3 Gateway will put the container with default policy. It can be specified via environment variable, e.g.: ``` S3_GW_DEFAULT_POLICY=REP 1 CBF 1 SELECT 1 FROM * ``` or via `.yaml` config file, e.g.: ``` default_policy: REP 1 ``` If the value is not set at all it will be set as `REP 3`. ### Cache parameters Parameters for caches in s3-gw can be specified in a .yaml config file. E.g.: ``` cache: lifetime: 300s size: 150 list_objects_lifetime: 1m ``` If invalid values are set, the gateway will use default values instead.