frostfs-s3-gw/docs/configuration.md

Configuration

There are three ways to configure the S3 GW:

1. CLI parameters
2. YAML file
3. Environment variables

Everything available as a CLI parameter can also be specified via environment variables and almost everything can be specified via .yaml configuration file.

But not vice versa, some parameters can be configured only with environment variables/configuration file. Most of these parameters have default values, therefore, these ways to configure the gateway are optional and basic configuration can be completed with CLI parameters only.

1. CLI parameters
   1. Nodes and weights
   2. Wallet
   3. Binding and TLS
   4. RPC endpoint and resolving of bucket names
   5. Processing of requests
   6. Connection to NeoFS
   7. Monitoring and metrics
2. YAML file and environment variables
   1. Configuration file

CLI parameters

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 and priorities, they can only be specified via environment variables or a configuration file.

Wallet

Wallet (--wallet) is a mandatory parameter. It is a path to a wallet file. You can provide a passphrase to decrypt a wallet via env variable or conf file, or you will be asked to enter a password interactively. You can also specify an account address to use from a wallet using the --address parameter.

Listening on address and TLS

You can make the gateway listen on specific address using the --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 are omitted):

$ neofs-s3-gw --listen_address 192.168.130.130:443 \
  --tls.key_file=key.pem --tls.cert_file=cert.pem

RPC endpoint and resolving of bucket names

To set RPC endpoint specify a value of parameter -r or --rpc_endpoint. The parameter is required if another parameter's --resolve_order value contains nns.

$ neofs-s3-gw --rpc_endpoint http://morph-chain.neofs.devenv:30333/ --resolve_order nns,dns

Processing of requests

Maximum number of clients whose requests can be handled by the gateway can be specified by the value of --max_clients_count parameter. --max_clients_deadline defines deadline after which the gate sends error RequestTimeout to a client.

$ neofs-s3-gw --max_clients_count 150 --max_clients_deadline 1m

Connection to NeoFS

Timeout to connect to NeoFS nodes can be set with --connect_timeout and timeout to check node health during rebalance--healthcheck_timeout.

Also, interval to check node health can be specified by --rebalance_interval value.

$ neofs-s3-gw --healthcheck_timeout 15s --connect_timeout 1m --rebalance_interval 1h

Monitoring and metrics

Pprof and Prometheus are integrated into the gateway. To enable them, use --pprof and --metrics flags or S3_GW_PPROF/S3_GW_METRICS environment variables.

YAML file and environment variables

Example of a YAML configuration file: yaml-example Examples of environment variables: env-example.

A path to a configuration file can be specified with --config parameter:

$ neofs-s3-gw --config your-config.yaml

NeoFS S3 Gateway configuration file

This section contains detailed NeoFS S3 Gateway configuration file description including default config values and some tips to set up configurable values.

There are some custom types used for brevity:

• duration -- string consisting of a number and a suffix. Suffix examples include s (seconds), m (minutes), ms ( milliseconds).

Structure

Section	Description
no section	General parameters
wallet	Wallet configuration
peers	Nodes configuration
tls	TLS configuration
logger	Logger configuration
cache	Cache configuration
nats	NATS configuration
cors	CORS configuration

General section

address: NfgHwwTi3wHAS8aFAN243C5vGbkYDpqLHP

listen_address: 0.0.0.0:8084

rpc_endpoint: http://morph-chain.neofs.devenv:30333
resolve_order:
  - nns
  - dns

metrics: false
pprof: false

connect_timeout: 10s
healthcheck_timeout: 15s
rebalance_interval: 60s

max_clients_count: 100
max_clients_deadline: 30s

default_policy: REP 3

Parameter	Type	Default value	Description
address	string		Account address to get from wallet. If omitted default one will be used.
listen_address	string	0.0.0.0:8080	The address that the gateway is listening on.
rpc_endpoint	string		The address of the RPC host to which the gateway connects to resolve bucket names (required to use the nns resolver).
resolve_order	[]string	[dns]	Order of bucket name resolvers to use. Available resolvers: dns, nns.
metrics	bool	false	Flag to enable and expose the prometheus metrics.
pprof	bool	false	Flag to enable the profiler.
connect_timeout	duration	10s	Timeout to connect to a node.
healthcheck_timeout	duration	15s	Timeout to check node health during rebalance.
rebalance_interval	duration	60s	Interval to check node health.
max_clients_count	int	100	Limits for processing of clients' requests.
max_clients_deadline	duration	30s	Deadline after which the gate sends error RequestTimeout to a client.
default_policy	string	REP 3	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.

wallet section

wallet:
  passphrase: "password"

Parameter	Type	Default value	Description
passphrase	string		Passphrase to decrypt wallet.

peers section

# Nodes configuration
# This configuration makes the gateway use the first node (node1.neofs:8080)
# while it's healthy. Otherwise, gateway uses the second node (node2.neofs:8080)
# for 10% of requests and the third node (node3.neofs:8080) for 90% of requests.
# Until nodes with the same priority level are healthy
# nodes with other priority are not used.
# The lower the value, the higher the priority.
peers:
  0:
    address: node1.neofs:8080
    priority: 1
    weight: 1
  1:
    address: node2.neofs:8080
    priority: 2
    weight: 0.1
  2:
    address: node3.neofs:8080
    priority: 2
    weight: 0.9

Parameter	Type	Default value	Description
address	string		Address of storage node.
priority	int	1	It allows to group nodes and don't switch group until all nodes with the same priority will be unhealthy. The lower the value, the higher the priority.
weight	float	1	Weight of node in the group with the same priority. Distribute requests to nodes proportionally to these values.

tls section

tls:
  cert_file: /path/to/cert
  key_file: /path/to/key

Parameter	Type	Default value	Description
cert_file	string		Path to the TLS certificate.
key_file	string		Path to the key.

logger section

logger:
  level: debug

Parameter	Type	Default value	Description
level	string	debug	Logging level. Possible values: debug, info, warn, error, dpanic, panic, fatal.

cache section

cache:
  objects:
    lifetime: 300s
    size: 150
  list:
    lifetime: 1m
    size: 100
  names:
    lifetime: 1m
    size: 1000
  buckets:
    lifetime: 1m
    size: 500
  system:
    lifetime: 2m
    size: 1000
  accessbox:
    lifetime: 5m
    size: 10

Parameter	Type	Default value	Description
objects	Cache config	lifetime: 5m size: 1000000	Cache for objects (NeoFS headers).
list	Cache config	lifetime: 60s size: 100000	Cache which keeps lists of objects in buckets.
names	Cache config	lifetime: 60s size: 10000	Cache which contains mapping of nice name to object addresses.
buckets	Cache config	lifetime: 60s size: 1000	Cache which contains mapping of bucket name to bucket info.
system	Cache config	lifetime: 5m size: 10000	Cache for system objects in a bucket: bucket settings, notification configuration etc.
accessbox	Cache config	lifetime: 10m size: 100	Cache which stores access box with tokens by its address.

cache subsection

lifetime: 2m
size: 1000

Parameter	Type	Default value	Description
lifetime	duration	depends on cache	Lifetime of entries in cache.
size	int	depends on cache	LRU cache size.

nats section

This is an advanced section, use with caution. You can turn on notifications about successful completions of basic operations, and the gateway will send notifications via NATS JetStream.

1. to configure the NATS server with JetStream
2. to specify NATS parameters for the S3 GW. It's necessary to define a values of nats.enable or S3_GW_NATS_ENABLED as True
3. to configure notifications in a bucket

nats:
  enabled: true
  endpoint: nats://localhost:4222
  timeout: 30s
  cert_file: /path/to/cert
  key_file: /path/to/key
  root_ca: /path/to/ca

Parameter	Type	Default value	Description
enabled	bool	false	Flag to enable the service.
endpoint	string		NATS endpoint to connect to.
timeout	duration	30s	Timeout for the object notification operation.
certificate	string		Path to the client certificate.
key	string		Path to the client key.
ca	string		Override root CA used to verify server certificates.

cors section

cors:
  default_max_age: 600

Parameter	Type	Default value	Description
default_max_age	int	600	Value of Access-Control-Max-Age header in seconds.