frostfs-s3-gw/docs/configuration.md

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.