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]

• [proxy-server]

[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.
allow_open_expired	false	If true (default is false), an object that has expired but not yet been reaped can be can be accessed by setting the ‘x-open-expired’ header to true in GET, HEAD, and POST requests.