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proxy-server.conf

configuration file for the OpenStack Swift proxy server

proxy-server.conf

This is the configuration file used by the proxy server and other proxy middlewares.

The configuration file follows the python-pastedeploy syntax. The file is divided into sections, which are enclosed by square brackets. Each section will contain a certain number of key/value parameters which are described later.

Any line that begins with a '#' symbol is ignored.

You can find more information about python-pastedeploy configuration format at https://docs.pylonsproject.org/projects/pastedeploy/en/latest/#config-format

This is indicated by section named [DEFAULT]. Below are the parameters that are acceptable within this section.

IP address the proxy server should bind to. The default is 0.0.0.0 which will make it bind to all available addresses.
TCP port the proxy server should bind to. The default is 80.
Value to set for socket TCP_KEEPIDLE. The default value is 600.
Timeout to bind socket. The default is 30.
TCP backlog. Maximum number of allowed pending connections. The default value is 4096.
Key to use for admin calls that are HMAC signed. Default is empty, which will disable admin calls to /info.
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 ".". The following would cause the sections 'container_quotas' and 'tempurl' to not be listed, and the key max_failed_deletes would be removed from bulk_delete. Default value is 'swift.valid_api_versions' which allows all registered features to be listed via HTTP GET /info except swift.valid_api_versions information
The number of pre-forked processes that will accept connections. Zero means no fork. The default is auto which will make the server try to match the number of effective cpu cores if python multiprocessing is available (included with most python distributions >= 2.6) or fallback to one. It's worth noting that individual workers will use many eventlet co-routines to service multiple concurrent requests.
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. The default is 1024.
The system user that the proxy server will run as. The default is swift.
Enables exposing configuration settings via HTTP GET /info. The default is true.
Swift configuration directory. The default is /etc/swift.
Location of the SSL certificate file. The default path is /etc/swift/proxy.crt. This is disabled by default.
Location of the SSL certificate key file. The default path is /etc/swift/proxy.key. This is disabled by default.
Label used when logging. The default is swift.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Logging address. The default is /dev/log.
To cap the length of log lines to the value given. No limit if set to 0, the default.
The default is false.
Comma separated list of functions to call to setup custom log handlers. functions get passed: conf, name, log_to_console, log_route, fmt, logger, adapted_logger. The default is empty.
If set, log_udp_host will override log_address.
UDP log port, the default is 514.
StatsD server. IPv4/IPv6 addresses and hostnames are supported. If a hostname resolves to an IPv4 and IPv6 address, the IPv4 address will be used.
The default is 8125.
The default is 1.
The default is 1.
The default is empty.
Time to wait while receiving each chunk of data from a client or another backend node. The default is 60.
Debug mode for eventlet library. The default is false.
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.
List of origin hosts that are allowed for CORS requests in addition to what the container has set. Use a comma separated list of full URL (http://foo.bar:1234,https://foo.bar)
If True (default) then CORS requests are only allowed if their Origin header matches an allowed origin. Otherwise, any Origin is allowed.
Comma separated list of headers to expose through Access-Control-Expose-Headers, in addition to the defaults and any headers set in container metadata.
Modify 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.
Modify 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. Work only with ionice_priority.
Modify 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.

This is indicated by section name [pipeline:main]. Below are the parameters that are acceptable within this section.

It is used when you need apply a number of filters. It is a list of filters ended by an application. The normal pipeline is "catch_errors gatekeeper healthcheck proxy-logging cache container_sync bulk tempurl ratelimit tempauth container-quotas account-quotas slo dlo versioned_writes proxy-logging proxy-server".

Note: The double proxy-logging in the pipeline is not a mistake. The left-most proxy-logging is there to log requests that were handled in middleware and never made it through to the right-most middleware (and proxy server). Double logging is prevented for normal requests. See proxy-logging docs.

Any section that has its name prefixed by "filter:" indicates a filter section. Filters are used to specify configuration parameters for specific swift middlewares. Below are the filters available and respective acceptable parameters.
[filter:healthcheck]
Entry point for paste.deploy for the healthcheck middleware. This is the reference to the installed python egg. This is normally egg:swift#healthcheck.
An optional filesystem path which, if present, will cause the healthcheck URL to return "503 Service Unavailable" with a body of "DISABLED BY FILE".

[filter:tempauth]
Entry point for paste.deploy for the tempauth middleware. This is the reference to the installed python egg. This is normally egg:swift#tempauth.
Label used when logging. The default is tempauth.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Logging address. The default is /dev/log.
Enables the ability to log request headers. The default is False.
The reseller prefix will verify a token begins with this prefix before even attempting to validate it. Also, with authorization, only Swift storage accounts with this prefix will be authorized by this middleware. Useful if multiple auth systems are in use for one Swift cluster. The default is AUTH.
The auth prefix will cause requests beginning with this prefix to be routed to the auth subsystem, for granting tokens, etc. The default is /auth/.
The require_group parameter names a group that must be presented by either X-Auth-Token or X-Service-Token. Usually this parameter is used only with multiple reseller prefixes (e.g., SERVICE_require_group=blah). By default, no group is needed. Do not use .admin.
This is the time in seconds before the token expires. The default is 86400.
This allows middleware higher in the WSGI pipeline to override auth processing, useful for middleware such as tempurl and formpost. If you know you're not going to use such middleware and you want a bit of extra security, you can set this to false. The default is true.
This specifies what scheme to return with storage urls: http, https, or default (chooses based on what the server is running as) This can be useful with an SSL load balancer in front of a non-SSL server.
Lastly, you need to list all the accounts/users you want here. The format is: user_<account>_<user> = <key> [group] [group] [...] [storage_url] or if you want underscores in <account> or <user>, you can base64 encode them (with no equal signs) and use this format: user64_<account_b64>_<user_b64> = <key> [group] [group] [...] [storage_url]

There are special groups of: .reseller_admin who can do anything to any account for this auth and also .admin who can do anything within the account.

If neither of these groups are specified, the user can only access containers that have been explicitly allowed for them by a .admin or .reseller_admin. The trailing optional storage_url allows you to specify an alternate URL to hand back to the user upon authentication. If not specified, this defaults to http[s]://<ip>:<port>/v1/<reseller_prefix>_<account> where http or https depends on whether cert_file is specified in the [DEFAULT] section, <ip> and <port> are based on the [DEFAULT] section's bind_ip and bind_port (falling back to 127.0.0.1 and 8080), <reseller_prefix> is from this section, and <account> is from the user_<account>_<user> name.

Here are example entries, required for running the tests:

[filter:authtoken]

To enable Keystone authentication you need to have the auth token middleware first to be configured. Here is an example below, please refer to the keystone's documentation for details about the different settings.

You'll need to have as well the keystoneauth middleware enabled and have it in your main pipeline so instead of having tempauth in there you can change it to: authtoken keystoneauth

The auth credentials ("project_domain_name", "user_domain_name", "username", "project_name", "password") must match the Keystone credentials for the Swift service. The example values shown here assume a user named "swift" with admin role on a project named "service", both being in the Keystone domain with id "default". Refer to the KeystoneMiddleware documentation at https://docs.openstack.org/keystonemiddleware/latest/middlewarearchitecture.html#configuration for other examples.

# delay_auth_decision defaults to False, but leaving it as false will
# prevent other auth systems, staticweb, tempurl, formpost, and ACLs from
# working. This value must be explicitly set to True.

[filter:keystoneauth]

Keystone authentication middleware.

Entry point for paste.deploy for the keystoneauth middleware. This is the reference to the installed python egg. This is normally egg:swift#keystoneauth.
The reseller_prefix option lists account namespaces that this middleware is responsible for. The prefix is placed before the Keystone project id. For example, for project 12345678, and prefix AUTH, the account is named AUTH_12345678 (i.e., path is /v1/AUTH_12345678/...). Several prefixes are allowed by specifying a comma-separated list as in: "reseller_prefix = AUTH, SERVICE". The empty string indicates a single blank/empty prefix. If an empty prefix is required in a list of prefixes, a value of '' (two single quote characters) indicates a blank/empty prefix. Except for the blank/empty prefix, an underscore ('_') character is appended to the value unless already present.
The user must have at least one role named by operator_roles on a project in order to create, delete and modify containers and objects and to set and read privileged headers such as ACLs. If there are several reseller prefix items, you can prefix the parameter so it applies only to those accounts (for example the parameter SERVICE_operator_roles applies to the /v1/SERVICE_<project> path). If you omit the prefix, the option applies to all reseller prefix items. For the blank/empty prefix, prefix with '' (do not put underscore after the two single quote characters).
The reseller admin role has the ability to create and delete accounts.
This allows middleware higher in the WSGI pipeline to override auth processing, useful for middleware such as tempurl and formpost. If you know you're not going to use such middleware and you want a bit of extra security, you can set this to false.
If the service_roles parameter is present, an X-Service-Token must be present in the request that when validated, grants at least one role listed in the parameter. The X-Service-Token may be scoped to any project. If there are several reseller prefix items, you can prefix the parameter so it applies only to those accounts (for example the parameter SERVICE_service_roles applies to the /v1/SERVICE_<project> path). If you omit the prefix, the option applies to all reseller prefix items. For the blank/empty prefix, prefix with '' (do not put underscore after the two single quote characters). By default, no service_roles are required.
For backwards compatibility, keystoneauth will match names in cross-tenant access control lists (ACLs) when both the requesting user and the tenant are in the default domain i.e the domain to which existing tenants are migrated. The default_domain_id value configured here should be the same as the value used during migration of tenants to keystone domains.
For a new installation, or an installation in which keystone projects may move between domains, you should disable backwards compatible name matching in ACLs by setting allow_names_in_acls to false:

[filter:cache]

Caching middleware that manages caching in swift.

Entry point for paste.deploy for the memcache middleware. This is the reference to the installed python egg. This is normally egg:swift#memcache.
Label used when logging. The default is memcache.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Logging address. The default is /dev/log.
Enables the ability to log request headers. The default is False.
Sets the maximum number of connections to each memcached server per worker.
If not set in the configuration file, the value for memcache_servers will be read from /etc/swift/memcache.conf (see memcache.conf-sample) or lacking that file, it will default to 127.0.0.1:11211. You can specify multiple servers separated with commas, as in: 10.1.2.3:11211,10.1.2.4:11211. (IPv6 addresses must follow rfc3986 section-3.2.2, i.e. [::1]:11211)

[filter:ratelimit]

Rate limits requests on both an Account and Container level. Limits are configurable.

Entry point for paste.deploy for the ratelimit middleware. This is the reference to the installed python egg. This is normally egg:swift#ratelimit.
Label used when logging. The default is ratelimit.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Logging address. The default is /dev/log.
Enables the ability to log request headers. The default is False.
This should represent how accurate the proxy servers' system clocks are with each other. 1000 means that all the proxies' clock are accurate to each other within 1 millisecond. No ratelimit should be higher than the clock accuracy. The default is 1000.
App will immediately return a 498 response if the necessary sleep time ever exceeds the given max_sleep_time_seconds. The default is 60 seconds.
To allow visibility into rate limiting set this value > 0 and all sleeps greater than the number will be logged. If set to 0 means disabled. The default is 0.
Number of seconds the rate counter can drop and be allowed to catch up (at a faster than listed rate). A larger number will result in larger spikes in rate but better average accuracy. The default is 5.
If set, will limit PUT and DELETE requests to /account_name/container_name. Number is in requests per second. If set to 0 means disabled. The default is 0.
When set with container_limit_x = r: for containers of size x, limit requests per second to r. Will limit PUT, DELETE, and POST requests to /a/c/o. The default is ''.
Similarly to the above container-level write limits, the following will limit container GET (listing) requests.

[filter:domain_remap]

Middleware that translates container and account parts of a domain to path parameters that the proxy server understands. The container.account.storageurl/object gets translated to container.account.storageurl/path_root/account/container/object and account.storageurl/path_root/container/object gets translated to account.storageurl/path_root/account/container/object

Entry point for paste.deploy for the domain_remap middleware. This is the reference to the installed python egg. This is normally egg:swift#domain_remap.
Label used when logging. The default is domain_remap.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Logging address. The default is /dev/log.
Enables the ability to log request headers. The default is False.
The domain to be used by the middleware. Multiple domains can be specified separated by a comma.
The path root value for the storage URL. The default is v1.
Browsers can convert a host header to lowercase, so check that reseller prefix on the account is the correct case. This is done by comparing the items in the reseller_prefixes config option to the found prefix. If they match except for case, the item from reseller_prefixes will be used instead of the found reseller prefix. When none match, the default reseller prefix is used. When no default reseller prefix is configured, any request with an account prefix not in that list will be ignored by this middleware. Defaults to 'AUTH'.
The default reseller prefix. This is used when none of the configured reseller_prefixes match. When not set, no reseller prefix is added.

[filter:catch_errors]
Entry point for paste.deploy for the catch_errors middleware. This is the reference to the installed python egg. This is normally egg:swift#catch_errors.
Label used when logging. The default is catch_errors.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Logging address. The default is /dev/log.
Enables the ability to log request headers. The default is False.

[filter:cname_lookup]

Note: this middleware requires python-dnspython

Entry point for paste.deploy for the cname_lookup middleware. This is the reference to the installed python egg. This is normally egg:swift#cname_lookup.
Label used when logging. The default is cname_lookup.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Logging address. The default is /dev/log.
Enables the ability to log request headers. The default is False.
The domain to be used by the middleware.
How deep in the CNAME chain to look for something that matches the storage domain. The default is 1.
Specify the nameservers to use to do the CNAME resolution. If unset, the system configuration is used. Multiple nameservers can be specified separated by a comma. Default is unset.

[filter:staticweb]

Note: Put staticweb just after your auth filter(s) in the pipeline

Entry point for paste.deploy for the staticweb middleware. This is the reference to the installed python egg. This is normally egg:swift#staticweb.
Label used when logging. The default is staticweb.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Logging address. The default is /dev/log.
Enables the ability to log request headers. The default is False.

[filter:tempurl]

Note: Put tempurl before slo, dlo, and your auth filter(s) in the pipeline

Entry point for paste.deploy for the tempurl middleware. This is the reference to the installed python egg. This is normally egg:swift#tempurl.
The methods allowed with Temp URLs. The default is 'GET HEAD PUT POST DELETE'.
The headers to remove from incoming requests. Simply a whitespace delimited list of header names and names can optionally end with '*' to indicate a prefix match. incoming_allow_headers is a list of exceptions to these removals.
The headers allowed as exceptions to incoming_remove_headers. Simply a whitespace delimited list of header names and names can optionally end with '*' to indicate a prefix match.
The headers to remove from outgoing responses. Simply a whitespace delimited list of header names and names can optionally end with '*' to indicate a prefix match. outgoing_allow_headers is a list of exceptions to these removals.
The headers allowed as exceptions to outgoing_remove_headers. Simply a whitespace delimited list of header names and names can optionally end with '*' to indicate a prefix match.

[filter:formpost]

Note: Put formpost just before your auth filter(s) in the pipeline

Entry point for paste.deploy for the formpost middleware. This is the reference to the installed python egg. This is normally egg:swift#formpost.

[filter:name_check]

Note: Just needs to be placed before the proxy-server in the pipeline.

Entry point for paste.deploy for the name_check middleware. This is the reference to the installed python egg. This is normally egg:swift#name_check.
Characters that will not be allowed in a name. The default is '"`<>.
Maximum number of characters that can be in the name. The default is 255.
Python regular expressions of substrings that will not be allowed in a name. The default is /./|/../|/.$|/..$.

[filter:list-endpoints]
Entry point for paste.deploy for the list_endpoints middleware. This is the reference to the installed python egg. This is normally egg:swift#list_endpoints.
The default is '/endpoints/'.

[filter:proxy-logging]

Logging for the proxy server now lives in this middleware. If the access_* variables are not set, logging directives from [DEFAULT] without "access_" will be used.

Entry point for paste.deploy for the proxy_logging middleware. This is the reference to the installed python egg. This is normally egg:swift#proxy_logging.
Label used when logging. The default is proxy-server.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Default is /dev/log.
If set, access_log_udp_host will override access_log_address. Default is unset.
Default is 514.
You can use log_statsd_* from [DEFAULT], or override them here. StatsD server. IPv4/IPv6 addresses and hostnames are supported. If a hostname resolves to an IPv4 and IPv6 address, the IPv4 address will be used.
Default is 8125.
Default is 1.
The default is 1.
Default is "" (empty-string)
Default is False.
If access_log_headers is True and access_log_headers_only is set only these headers are logged. Multiple headers can be defined as comma separated list like this: access_log_headers_only = Host, X-Object-Meta-Mtime
By default, the X-Auth-Token is logged. To obscure the value, set reveal_sensitive_prefix to the number of characters to log. For example, if set to 12, only the first 12 characters of the token appear in the log. An unauthorized access of the log file won't allow unauthorized usage of the token. However, the first 12 or so characters is unique enough that you can trace/debug token usage. Set to 0 to suppress the token completely (replaced by '...' in the log). The default is 16 chars. Note: reveal_sensitive_prefix will not affect the value logged with access_log_headers=True.
What HTTP methods are allowed for StatsD logging (comma-sep); request methods not in this list will have "BAD_METHOD" for the <verb> portion of the metric. Default is "GET,HEAD,POST,PUT,DELETE,COPY,OPTIONS".
Hashing algorithm for anonymization. Must be one of algorithms supported by Python's hashlib. Default is MD5.
Salt added as prefix before hashing the value to anonymize. Default is empty (no salt).
Template used to format access logs. All words surrounded by curly brackets will be substituted with the appropriate values.

[filter:bulk]

Note: Put before both ratelimit and auth in the pipeline.

Entry point for paste.deploy for the bulk middleware. This is the reference to the installed python egg. This is normally egg:swift#bulk.
The default is 10000.
The default is 1000.
The default is 10000.
The default is 1000.

In order to keep a connection active during a potentially long bulk request, Swift may return whitespace prepended to the actual response body. This whitespace will be yielded no more than every yield_frequency seconds. The default is 10.

Note: This parameter is used during a bulk delete of objects and their container. This would frequently fail because it is very likely that all replicated objects have not been deleted by the time the middleware got a successful response. It can be configured the number of retries. And the number of seconds to wait between each retry will be 1.5**retry The default is 0.

[filter:slo]

Note: Put after auth and staticweb in the pipeline.

Entry point for paste.deploy for the slo middleware. This is the reference to the installed python egg. This is normally egg:swift#slo.
The default is 1000.
The default is 2097152.
The default is 1048576
Start rate-limiting object segments after the Nth segment of a segmented object. The default is 10 segments.
Once segment rate-limiting kicks in for an object, limit segments served to N per second. The default is 1.
Time limit on GET requests (seconds). The default is 86400.

[filter:dlo]

Note: Put after auth and staticweb in the pipeline. If you don't put it in the pipeline, it will be inserted for you.

Entry point for paste.deploy for the dlo middleware. This is the reference to the installed python egg. This is normally egg:swift#dlo.
Start rate-limiting object segments after the Nth segment of a segmented object. The default is 10 segments.
Once segment rate-limiting kicks in for an object, limit segments served to N per second. The default is 1.
Time limit on GET requests (seconds). The default is 86400.

[filter:container-quotas]

Note: Put after auth in the pipeline.

Entry point for paste.deploy for the container_quotas middleware. This is the reference to the installed python egg. This is normally egg:swift#container_quotas.

[filter:account-quotas]

Note: Put after auth in the pipeline.

Entry point for paste.deploy for the account_quotas middleware. This is the reference to the installed python egg. This is normally egg:swift#account_quotas.

[filter:gatekeeper]

Note: this middleware requires python-dnspython

Entry point for paste.deploy for the gatekeeper middleware. This is the reference to the installed python egg. This is normally egg:swift#gatekeeper.
Label used when logging. The default is gatekeeper.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Logging address. The default is /dev/log.
Enables the ability to log request headers. The default is False.

[filter:container_sync]

Note: this middleware requires python-dnspython

Entry point for paste.deploy for the container_sync middleware. This is the reference to the installed python egg. This is normally egg:swift#container_sync.
Set this to false if you want to disallow any full URL values to be set for any new X-Container-Sync-To headers. This will keep any new full urls from coming in, but won't change any existing values already in the cluster. Updating those will have to be done manually, as knowing what the true realm endpoint should be cannot always be guessed. The default is true.
Set this to specify this clusters //realm/cluster as "current" in /info

[filter:xprofile]

Note: Put it at the beginning of the pipeline to profile all middleware. But it is safer to put this after healthcheck.

Entry point for paste.deploy for the xprofile middleware. This is the reference to the installed python egg. This is normally egg:swift#xprofile.
This option enable you to switch profilers which should inherit from python standard profiler. Currently the supported value can be 'cProfile', 'eventlet.green.profile' etc.
This prefix will be used to combine process ID and timestamp to name the profile data file. Make sure the executing user has permission to write into this path (missing path segments will be created, if necessary). If you enable profiling in more than one type of daemon, you must override it with an unique value like, the default is /var/log/swift/profile/account.profile.
The profile data will be dumped to local disk based on above naming rule in this interval. The default is 5.0.
Be careful, this option will enable profiler to dump data into the file with time stamp which means there will be lots of files piled up in the directory. The default is false
This is the path of the URL to access the mini web UI. The default is __profile__.
Clear the data when the wsgi server shutdown. The default is false.
Unwind the iterator of applications. Default is false.

[filter:versioned_writes]

Note: Put after slo, dlo in the pipeline. If you don't put it in the pipeline, it will be inserted automatically.

Entry point for paste.deploy for the versioned_writes middleware. This is the reference to the installed python egg. This is normally egg:swift#versioned_writes.
Enables using versioned writes middleware and exposing configuration settings via HTTP GET /info. WARNING: Setting this option bypasses the "allow_versions" option in the container configuration file, which will be eventually deprecated. See documentation for more details.

This is indicated by section name [app:proxy-server]. Below are the parameters that are acceptable within this section.
Entry point for paste.deploy for the proxy server. This is the reference to the installed python egg. This is normally egg:swift#proxy.
Label used when logging. The default is proxy-server.
Syslog log facility. The default is LOG_LOCAL0.
Logging level. The default is INFO.
Logging address. The default is /dev/log.
Log when handoff locations are used. Default is True.
Cache timeout in seconds to send memcached for account existence. The default is 60 seconds.
Cache timeout in seconds to send memcached for container existence. The default is 60 seconds.
Chunk size to read from object servers. The default is 65536.
Chunk size to read from clients. The default is 65536.
Request timeout to external services. The default is 10 seconds.
How long the proxy server will wait for an initial response and to read a chunk of data from the object servers while serving GET / HEAD requests. Timeouts from these requests can be recovered from so setting this to something lower than node_timeout would provide quicker error recovery while allowing for a longer timeout for non-recoverable requests (PUTs). Defaults to node_timeout, should be overridden if node_timeout is set to a high number to prevent client timeouts from firing before the proxy server has a chance to retry.
Connection timeout to external services. The default is 0.5 seconds.
How long to wait for requests to finish after a quorum has been established. The default is 0.5 seconds.
Time in seconds that must elapse since the last error for a node to be considered no longer error limited. The default is 60 seconds.
Error count to consider a node error limited. The default is 10.
Whether account PUTs and DELETEs are even callable. If set to 'true' any authorized user may create and delete accounts; if 'false' no one, even authorized, can. The default is false.
If set to 'true' authorized accounts that do not yet exist within the Swift cluster will be automatically created. The default is set to false.
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.
This is a comma separated list of account hashes that ignore the max_containers_per_account cap.
Comma separated list of Host headers to which the proxy will deny requests. The default is empty.
Storage nodes can be chosen at random (shuffle - default), 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. The valid values for sorting_method are "affinity", "shuffle", and "timing".
If the "timing" sorting_method is used, the timings will only be valid for the number of seconds configured by timing_expiry. The default is 300.
If "on" then 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. Default is "off".
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 the value of conn_timeout (0.5).
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. The default is '2 * replicas'.
Specifies which backend servers to prefer on reads. 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.

Example: first read from region 1 zone 1, then region 1 zone 2, then anything in region 2, then everything else:

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. If this is set, then when handling an object PUT request, some number (see setting write_affinity_node_count) of local backend servers will be tried before any nonlocal ones. Default is empty, meaning no preference.

Example: try to write to regions 1 and 2 before writing to any other nodes:

write_affinity = r1, r2
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. The default is '2 * replicas'.
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. The default is 'x-container-read, x-container-write, x-container-sync-key, x-container-sync-to, x-account-meta-temp-url-key, x-account-meta-temp-url-key-2, x-container-meta-temp-url-key, x-container-meta-temp-url-key-2, x-account-access-control'.
Start rate-limiting object segments after the Nth segment of a segmented object. The default is 10 segments.
Once segment rate-limiting kicks in for an object, limit segments served to N per second. The default is 1.
Modify 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.
Modify 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. Work only with ionice_priority.
Modify 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.

More in depth documentation about the swift-proxy-server and also OpenStack Swift as a whole can be found at https://docs.openstack.org/swift/latest/admin_guide.html and https://docs.openstack.org/swift/latest/

swift-proxy-server(1)