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 FrostFS
   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 FrostFS nodes; this will make a gateway spread requests equally among them (using weight 1 for every node):

$ frostfs-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):

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

Using these flag you can configure only one address. To set multiple addresses use yaml config.

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.

$ frostfs-s3-gw --rpc_endpoint http://morph-chain.frostfs.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.

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

Connection to FrostFS

Timeout to connect to FrostFS 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.

$ frostfs-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_ENABLED/S3_GW_PROMETHEUS_ENABLED 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:

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

Multiple configs

You can use several config files when running application. It allows you to split configuration into parts. For example, you can use separate yaml file for pprof and prometheus section in config (see config examples). You can either provide several files with repeating --config flag or provide path to the dir that contains all configs using --config-dir flag. Also, you can combine these flags:

$ frostfs-s3-gw --config ./config/config.yaml --config /your/partial/config.yaml --config-dir ./config/dir

Note: next file in --config flag overwrites values from the previous one. Files from --config-dir directory overwrite values from --config files. So the command above run frostfs-s3-gw to listen on 0.0.0.0:8080 address (value from ./config/config.yaml), applies parameters from /your/partial/config.yaml, enable pprof (value from ./config/dir/pprof.yaml) and prometheus (value from ./config/dir/prometheus.yaml).

Reload on SIGHUP

Some config values can be reloaded on SIGHUP signal. Such parameters have special mark in tables below.

You can send SIGHUP signal to app using the following command:

$ kill -s SIGHUP <app_pid>

Example:

$ ./bin/frostfs-s3-gw --config config.yaml  &> s3.log &
[1] 998346

$ cat s3.log
# ...
2022-09-30T17:38:22.338+0300    info    s3-gw/app.go:371        application started     {"name": "frostfs-s3-gw", "version": "v0.24.0"}
# ...

$ kill -s SIGHUP 998346

$ cat s3.log
# ...
2022-09-30T17:38:40.909+0300    info    s3-gw/app.go:491        SIGHUP config reload completed

FrostFS S3 Gateway configuration file

This section contains detailed FrostFS 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
placement_policy	Placement policy configuration
server	Server configuration
logger	Logger configuration
cache	Cache configuration
nats	NATS configuration
cors	CORS configuration
pprof	Pprof configuration
prometheus	Prometheus configuration
tracing	Tracing configuration
frostfs	Parameters of requests to FrostFS
resolve_bucket	Bucket name resolving configuration
kludge	Different kludge configuration

General section

listen_domains:
   - s3dev.frostfs.devenv
   - s3dev2.frostfs.devenv

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

connect_timeout: 10s
stream_timeout: 10s
healthcheck_timeout: 15s
rebalance_interval: 60s
pool_error_threshold: 100

max_clients_count: 100
max_clients_deadline: 30s

allowed_access_key_id_prefixes:
   - Ck9BHsgKcnwfCTUSFm6pxhoNS4cBqgN2NQ8zVgPjqZDX
   - 3stjWenX15YwYzczMr88gy3CQr4NYFBQ8P7keGzH5QFn

Parameter	Type	SIGHUP reload	Default value	Description
listen_domains	[]string			Domains to be able to use virtual-hosted-style access to bucket.
rpc_endpoint	string	yes		The address of the RPC host to which the gateway connects to resolve bucket names (required to use the nns resolver).
resolve_order	[]string	yes	[dns]	Order of bucket name resolvers to use. Available resolvers: dns, nns.
connect_timeout	duration		10s	Timeout to connect to a node.
stream_timeout	duration		10s	Timeout for individual operations in streaming RPC.
healthcheck_timeout	duration		15s	Timeout to check node health during rebalance.
rebalance_interval	duration		60s	Interval to check node health.
pool_error_threshold	uint32		100	The number of errors on connection after which node is considered as unhealthy.
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.
allowed_access_key_id_prefixes	[]string			List of allowed AccessKeyID prefixes which S3 GW serve. If the parameter is omitted, all AccessKeyID will be accepted.

wallet section

wallet:
   path: /path/to/wallet.json # Path to wallet
   passphrase: "" # Passphrase to decrypt wallet.
   address: NfgHwwTi3wHAS8aFAN243C5vGbkYDpqLHP

Parameter	Type	Default value	Description
path	string		Path to wallet
passphrase	string		Passphrase to decrypt wallet.
address	string		Account address to get from wallet. If omitted default one will be used.

peers section

# Nodes configuration
# This configuration makes the gateway use the first node (node1.frostfs:8080)
# while it's healthy. Otherwise, gateway uses the second node (node2.frostfs:8080)
# for 10% of requests and the third node (node3.frostfs: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.frostfs:8080
    priority: 1
    weight: 1
  1:
    address: node2.frostfs:8080
    priority: 2
    weight: 0.1
  2:
    address: node3.frostfs: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.

placement_policy section

placement_policy:
  default: REP 3
  region_mapping: /path/to/mapping/rules.json
  copies_numbers:
    - location_constraint: one-dc
      vector:
        - 1
        - 2
        - 3

Parameter	Type	SIGHUP reload	Default value	Description
default	string	yes	REP 3	Default policy of placing containers in FrostFS. If a user sends a request CreateBucket and doesn't define policy for placing of a container in FrostFS, the S3 Gateway will put the container with default policy.
region_mapping	string	yes		Path to file that maps aws LocationContraint values to FrostFS placement policy. The similar to --container-policy flag in frostfs-s3-authmate util, see in docs
copies_numbers	[]Copies numbers	no		Array of configured location constraints and their copies numbers.

File for region_mapping must contain something like this:

{
   "rep-3": "REP 3",
   "complex": "REP 1 IN X CBF 1 SELECT 1 FROM * AS X",
   "example-json-policy": "{\"replicas\":[{\"count\":3,\"selector\":\"SelASD0\"}],\"container_backup_factor\":3,\"selectors\":[{\"name\":\"SelASD0\",\"count\":3,\"filter\":\"*\"}],\"filters\":[]}"
}

Note: on SIGHUP reload policies will be updated only if both parameters are valid. So if you change default to some valid value and set invalid path in region_mapping the default value won't be changed.

copies_numbers subsection

- location_constraint: sample-01
  vector:
    - 1
    - 2
    - 3

Parameter	Type	SIGHUP reload	Default value	Description
location_constraint	string	no		Location constraint text label.
vector	[]int	no		Array of copies numbers corresponding to the constraint.

server section

You can specify several listeners for server. For example, for http and https.

server:
  - address: 0.0.0.0:8080
    tls:
      enabled: false
      cert_file: /path/to/cert
      key_file: /path/to/key
  - address: 0.0.0.0:8081
    tls:
      enabled: true
      cert_file: /path/to/another/cert
      key_file: /path/to/another/key

Parameter	Type	SIGHUP reload	Default value	Description
address	string		0.0.0.0:8080	The address that the gateway is listening on.
tls.enabled	bool		false	Enable TLS or not.
tls.cert_file	string	yes		Path to the TLS certificate.
tls.key_file	string	yes		Path to the key.

logger section

logger:
  level: debug

Parameter	Type	SIGHUP reload	Default value	Description
level	string	yes	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
  accesscontrol:
    lifetime: 1m
    size: 100000

Parameter	Type	Default value	Description
objects	Cache config	lifetime: 5m size: 1000000	Cache for objects (FrostFS 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.
accesscontrol	Cache config	lifetime: 1m size: 100000	Cache which stores owner to cache operation mapping.

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.

pprof section

Contains configuration for the pprof profiler.

pprof:
  enabled: true
  address: localhost:8085

Parameter	Type	SIGHUP reload	Default value	Description
enabled	bool	yes	false	Flag to enable the service.
address	string	yes	localhost:8085	Address that service listener binds to.

prometheus section

Contains configuration for the prometheus metrics service. General metrics are available on /metrics url path, billing metrics on /metrics/billing.

prometheus:
  enabled: true
  address: localhost:8086

Parameter	Type	SIGHUP reload	Default value	Description
enabled	bool	yes	false	Flag to enable the service.
address	string	yes	localhost:8086	Address that service listener binds to.

tracing section

Contains configuration for the tracing service.

tracing:
  enabled: false
  exporter: "otlp_grpc"
  endpoint: "localhost:4318"

Parameter	Type	SIGHUP reload	Default value	Description
enabled	bool	yes	false	Flag to enable the service.
exporter	string	yes	``	Type of tracing exporter.
endpoint	string	yes	``	Address that service listener binds to.

frostfs section

Contains parameters of requests to FrostFS. This value can be overridden with X-Amz-Meta-Frostfs-Copies-Number (value is comma separated numbers: 1,2,3) header for PutObject, CopyObject, CreateMultipartUpload.

frostfs:
  set_copies_number: [0]

Parameter	Type	Default value	Description
set_copies_number	[]uint32	[0]	Numbers of the object copies (for each replica) to consider PUT to FrostFS successful. Default value [0] or empty list means that object will be processed according to the container's placement policy

resolve_bucket section

Bucket name resolving parameters from and to container ID with HEAD request.

resolve_bucket:
  allow:
    - container
  deny:

Parameter	Type	Default value	Description
allow	[]string		List of container zones which are available to resolve. Mutual exclusive with deny list. Prioritized over deny list.
deny	[]string		List of container zones which are restricted to resolve. Mutual exclusive with allow list.

kludge section

Workarounds for non-standard use cases.

kludge:
  use_default_xmlns_for_complete_multipart: false
  complete_multipart_keepalive: 10s
  bypass_content_encoding_check_in_chunks: false

Parameter	Type	SIGHUP reload	Default value	Description
use_default_xmlns_for_complete_multipart	bool	yes	false	Enable using default xml namespace http://s3.amazonaws.com/doc/2006-03-01/ when parse CompleteMultipartUpload xml body.
complete_multipart_keepalive	duration	no	10s	Set timeout between whitespace transmissions during CompleteMultipartUpload processing.
bypass_content_encoding_check_in_chunks	bool	yes	false	Use this flag to be able to use chunked upload approach without having aws-chunked value in Content-Encoding header.