Proxy Server Configuration

This document describes the configuration options available for the proxy server. Some proxy server options may be configured on a per-policy basis. Additional documentation for proxy-server middleware can be found at Middleware and The Auth System.

Documentation for other swift configuration options can be found at Configuration Documentation.

An example Proxy Server configuration can be found at etc/proxy-server.conf-sample in the source code repository.

The following configuration sections are available:

[DEFAULT]

Option

Default

Description

bind_ip

0.0.0.0

IP Address for server to bind to

bind_port

80

Port for server to bind to

keep_idle

600

Value to set for socket TCP_KEEPIDLE

bind_timeout

30

Seconds to attempt bind before giving up

backlog

4096

Maximum number of allowed pending connections

swift_dir

/etc/swift

Swift configuration directory

workers

auto

Override the number of pre-forked workers that will accept connections. If set it should be an integer, zero means no fork. If unset, it will try to default to the number of effective cpu cores and fallback to one. See General Service Tuning.

max_clients

1024

Maximum number of clients one worker can process simultaneously (it will actually accept(2) N + 1). Setting this to one (1) will only handle one request at a time, without accepting another request concurrently.

user

swift

User to run as

cert_file

Path to the ssl .crt. This should be enabled for testing purposes only.

key_file

Path to the ssl .key. This should be enabled for testing purposes only.

cors_allow_origin

List of origin hosts that are allowed for CORS requests in addition to what the container has set.

strict_cors_mode

True

If True (default) then CORS requests are only allowed if their Origin header matches an allowed origin. Otherwise, any Origin is allowed.

cors_expose_headers

This is a list of headers that are included in the header Access-Control-Expose-Headers in addition to what the container has set.

client_timeout

60

trans_id_suffix

This optional suffix (default is empty) that would be appended to the swift transaction id allows one to easily figure out from which cluster that X-Trans-Id belongs to. This is very useful when one is managing more than one swift cluster.

log_name

swift

Label used when logging

log_facility

LOG_LOCAL0

Syslog log facility

log_level

INFO

Logging level

log_headers

False

log_address

/dev/log

Logging directory

log_max_line_length

0

Caps the length of log lines to the value given; no limit if set to 0, the default.

log_custom_handlers

None

Comma separated list of functions to call to setup custom log handlers.

log_udp_host

Override log_address

log_udp_port

514

UDP log port

log_statsd_host

None

Enables StatsD logging; IPv4/IPv6 address or a hostname. If a hostname resolves to an IPv4 and IPv6 address, the IPv4 address will be used.

log_statsd_port

8125

log_statsd_default_sample_rate

1.0

log_statsd_sample_rate_factor

1.0

log_statsd_metric_prefix

eventlet_debug

false

If true, turn on debug logging for eventlet

expose_info

true

Enables exposing configuration settings via HTTP GET /info.

admin_key

Key to use for admin calls that are HMAC signed. Default is empty, which will disable admin calls to /info.

disallowed_sections

swift.valid_api_versions

Allows the ability to withhold sections from showing up in the public calls to /info. You can withhold subsections by separating the dict level with a “.”.

expiring_objects_container_divisor

86400

expiring_objects_account_name

expiring_objects

nice_priority

None

Scheduling priority of server processes. Niceness values range from -20 (most favorable to the process) to 19 (least favorable to the process). The default does not modify priority.

ionice_class

None

I/O scheduling class of server processes. I/O niceness class values are IOPRIO_CLASS_RT (realtime), IOPRIO_CLASS_BE (best-effort) and IOPRIO_CLASS_IDLE (idle). The default does not modify class and priority. Linux supports io scheduling priorities and classes since 2.6.13 with the CFQ io scheduler. Work only with ionice_priority.

ionice_priority

None

I/O scheduling priority of server processes. I/O niceness priority is a number which goes from 0 to 7. The higher the value, the lower the I/O priority of the process. Work only with ionice_class. Ignored if IOPRIO_CLASS_IDLE is set.

[proxy-server]

Option

Default

Description

use

Entry point for paste.deploy for the proxy server. For most cases, this should be egg:swift#proxy.

set log_name

proxy-server

Label used when logging

set log_facility

LOG_LOCAL0

Syslog log facility

set log_level

INFO

Log level

set log_headers

True

If True, log headers in each request

set log_handoffs

True

If True, the proxy will log whenever it has to failover to a handoff node

recheck_account_existence

60

Cache timeout in seconds to send memcached for account existence

recheck_container_existence

60

Cache timeout in seconds to send memcached for container existence

account_existence_skip_cache_pct

0.0

Periodically, bypass the cache for account info requests and goto disk to refresh the data in the cache. This is a percentage of requests should randomly skip. Values around 0.0 - 0.1 (1 in every 1000) are recommended.

container_existence_skip_cache_pct

0.0

Periodically, bypass the cache for container info requests and goto disk to refresh the data in the cache. This is a percentage of requests should randomly skip. Values around 0.0 - 0.1 (1 in every 1000) are recommended.

container_updating_shard_ranges_skip_cache_pct

0.0

Periodically, bypass the cache for shard_range update requests and goto disk to refresh the data in the cache. This is a percentage of requests should randomly skip. Values around 0.0 - 0.1 (1 in every 1000) are recommended.

container_listing_shard_ranges_skip_cache_pct

0.0

Periodically, bypass the cache for shard_range listing info requests and goto disk to refresh the data in the cache. This is a percentage of requests should randomly skip. Values around 0.0 - 0.1 (1 in every 1000) are recommended.

object_chunk_size

65536

Chunk size to read from object servers

client_chunk_size

65536

Chunk size to read from clients

memcache_servers

127.0.0.1:11211

Comma separated list of memcached servers ip:port or [ipv6addr]:port, if this value is empty, the memcache client will look for a [memcache.conf]

memcache_max_connections

2

Max number of connections to each memcached server per worker

node_timeout

10

Request timeout to external services

recoverable_node_timeout

node_timeout

Request timeout to external services for requests that, on failure, can be recovered from. For example, object GET.

client_timeout

60

Timeout to read one chunk from a client

conn_timeout

0.5

Connection timeout to external services

error_suppression_interval

60

Time in seconds that must elapse since the last error for a node to be considered no longer error limited

error_suppression_limit

10

Error count to consider a node error limited

allow_account_management

false

Whether account PUTs and DELETEs are even callable

account_autocreate

false

If set to ‘true’ authorized accounts that do not yet exist within the Swift cluster will be automatically created.

max_containers_per_account

0

If set to a positive value, trying to create a container when the account already has at least this maximum containers will result in a 403 Forbidden. Note: This is a soft limit, meaning a user might exceed the cap for recheck_account_existence before the 403s kick in.

max_containers_whitelist

This is a comma separated list of account names that ignore the max_containers_per_account cap.

rate_limit_after_segment

10

Rate limit the download of large object segments after this segment is downloaded.

rate_limit_segments_per_sec

1

Rate limit large object downloads at this rate.

request_node_count

2 * replicas

Set to the number of nodes to contact for a normal request. You can use ‘* replicas’ at the end to have it use the number given times the number of replicas for the ring being used for the request.

swift_owner_headers

<see the sample conf file for the list of default headers>

These are the headers whose values will only be shown to swift_owners. The exact definition of a swift_owner is up to the auth system in use, but usually indicates administrative responsibilities.

sorting_method

shuffle

Storage nodes can be chosen at random (shuffle), by using timing measurements (timing), or by using an explicit match (affinity). Using timing measurements may allow for lower overall latency, while using affinity allows for finer control. In both the timing and affinity cases, equally-sorting nodes are still randomly chosen to spread load. This option may be overridden in a per-policy configuration section.

timing_expiry

300

If the “timing” sorting_method is used, the timings will only be valid for the number of seconds configured by timing_expiry.

concurrent_gets

off

Use replica count number of threads concurrently during a GET/HEAD and return with the first successful response. In the EC case, this parameter only affects an EC HEAD as an EC GET behaves differently.

concurrency_timeout

conn_timeout

This parameter controls how long to wait before firing off the next concurrent_get thread. A value of 0 would we fully concurrent, any other number will stagger the firing of the threads. This number should be between 0 and node_timeout. The default is conn_timeout (0.5).

nice_priority

None

Scheduling priority of server processes. Niceness values range from -20 (most favorable to the process) to 19 (least favorable to the process). The default does not modify priority.

ionice_class

None

I/O scheduling class of server processes. I/O niceness class values are IOPRIO_CLASS_RT (realtime), IOPRIO_CLASS_BE (best-effort), and IOPRIO_CLASS_IDLE (idle). The default does not modify class and priority. Linux supports io scheduling priorities and classes since 2.6.13 with the CFQ io scheduler. Work only with ionice_priority.

ionice_priority

None

I/O scheduling priority of server processes. I/O niceness priority is a number which goes from 0 to 7. The higher the value, the lower the I/O priority of the process. Work only with ionice_class. Ignored if IOPRIO_CLASS_IDLE is set.

read_affinity

None

Specifies which backend servers to prefer on reads; used in conjunction with the sorting_method option being set to ‘affinity’. Format is a comma separated list of affinity descriptors of the form <selection>=<priority>. The <selection> may be r<N> for selecting nodes in region N or r<N>z<M> for selecting nodes in region N, zone M. The <priority> value should be a whole number that represents the priority to be given to the selection; lower numbers are higher priority. Default is empty, meaning no preference. This option may be overridden in a per-policy configuration section.

write_affinity

None

Specifies which backend servers to prefer on writes. Format is a comma separated list of affinity descriptors of the form r<N> for region N or r<N>z<M> for region N, zone M. Default is empty, meaning no preference. This option may be overridden in a per-policy configuration section.

write_affinity_node_count

2 * replicas

The number of local (as governed by the write_affinity setting) nodes to attempt to contact first on writes, before any non-local ones. The value should be an integer number, or use ‘* replicas’ at the end to have it use the number given times the number of replicas for the ring being used for the request. This option may be overridden in a per-policy configuration section.

write_affinity_handoff_delete_count

auto

The number of local (as governed by the write_affinity setting) handoff nodes to attempt to contact on deletion, in addition to primary nodes. Example: in geographically distributed deployment, If replicas=3, sometimes there may be 1 primary node and 2 local handoff nodes in one region holding the object after uploading but before object replicated to the appropriate locations in other regions. In this case, include these handoff nodes to send request when deleting object could help make correct decision for the response. The default value ‘auto’ means Swift will calculate the number automatically, the default value is (replicas - len(local_primary_nodes)). This option may be overridden in a per-policy configuration section.