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.TH "SYNCTHING-CONFIG" "5" "Sep 26, 2021" "v1" "Syncthing"
.SH NAME
syncthing-config \- Syncthing Configuration
.SH SYNOPSIS
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
$HOME/.config/syncthing
$HOME/Library/Application Support/Syncthing
%LOCALAPPDATA%\eSyncthing
.ft P
.fi
.UNINDENT
.UNINDENT
.SH DESCRIPTION
.sp
New in version 1.5.0: Database and config can now be set separately. Previously the database was
always located in the same directory as the config.

.sp
Syncthing uses a single directory to store configuration and crypto keys.
Syncthing also has a database, which is often stored in this directory too.
The config location defaults to \fB$HOME/.config/syncthing\fP
(Unix\-like), \fB$HOME/Library/Application Support/Syncthing\fP (Mac),
or \fB%LOCALAPPDATA%\eSyncthing\fP (Windows). It can be changed at runtime
using the \fB\-\-config\fP flag. In this directory the following files are
located:
.INDENT 0.0
.TP
.B \fBconfig.xml\fP
The configuration file, in XML format.
.TP
.B \fBcert.pem\fP, \fBkey.pem\fP
The device’s ECDSA public and private key. These form the basis for the
device ID. The key must be kept private.
.TP
.B \fBhttps\-cert.pem\fP, \fBhttps\-key.pem\fP
The certificate and key for HTTPS GUI connections. These may be replaced
with a custom certificate for HTTPS as desired.
.TP
.B \fBcsrftokens.txt\fP
A list of recently issued CSRF tokens (for protection against browser cross
site request forgery).
.UNINDENT
.sp
The database is stored either in the same directory as the config (usually the
default), but may also be located in one of the following directories (Unix\-like
platforms only):
.INDENT 0.0
.IP \(bu 2
If a database exists in the old default location, that location is
still used.
.IP \(bu 2
If \fB$XDG_DATA_HOME\fP is set, use \fB$XDG_DATA_HOME/syncthing\fP\&.
.IP \(bu 2
If \fB~/.local/share/syncthing\fP exists, use that location.
.IP \(bu 2
Use the old default location (same as config).
.UNINDENT
.sp
The location of the database can be changed using the \fB\-\-data\fP flag. The
\fB\-\-home\fP flag sets both config and database locations at the same time.
The database contains the following files:
.INDENT 0.0
.TP
.B \fBindex\-\fP\fI*\fP\fB\&.db\fP
A directory holding the database with metadata and hashes of the files
currently on disk and available from peers.
.UNINDENT
.SH CONFIG FILE FORMAT
.sp
The following shows an example of a default configuration file (IDs will differ):
.sp
\fBNOTE:\fP
.INDENT 0.0
.INDENT 3.5
The config examples are present for illustration. Do \fBnot\fP copy them
entirely to use as your config. They are likely out\-of\-date and the values
may no longer correspond to the defaults.
.UNINDENT
.UNINDENT
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
<configuration version="30">
    <folder id="default" label="Default Folder" path="/Users/jb/Sync/" type="sendreceive" rescanIntervalS="3600" fsWatcherEnabled="true" fsWatcherDelayS="10" ignorePerms="false" autoNormalize="true">
        <filesystemType>basic</filesystemType>
        <device id="3LT2GA5\-CQI4XJM\-WTZ264P\-MLOGMHL\-MCRLDNT\-MZV4RD3\-KA745CL\-OGAERQZ"></device>
        <minDiskFree unit="%">1</minDiskFree>
        <versioning></versioning>
        <copiers>0</copiers>
        <pullerMaxPendingKiB>0</pullerMaxPendingKiB>
        <hashers>0</hashers>
        <order>random</order>
        <ignoreDelete>false</ignoreDelete>
        <scanProgressIntervalS>0</scanProgressIntervalS>
        <pullerPauseS>0</pullerPauseS>
        <maxConflicts>\-1</maxConflicts>
        <disableSparseFiles>false</disableSparseFiles>
        <disableTempIndexes>false</disableTempIndexes>
        <paused>false</paused>
        <weakHashThresholdPct>25</weakHashThresholdPct>
        <markerName>.stfolder</markerName>
        <copyOwnershipFromParent>false</copyOwnershipFromParent>
        <modTimeWindowS>0</modTimeWindowS>
        <maxConcurrentWrites>2</maxConcurrentWrites>
        <disableFsync>false</disableFsync>
        <blockPullOrder>standard</blockPullOrder>
        <copyRangeMethod>standard</copyRangeMethod>
    </folder>
    <device id="3LT2GA5\-CQI4XJM\-WTZ264P\-MLOGMHL\-MCRLDNT\-MZV4RD3\-KA745CL\-OGAERQZ" name="syno" compression="metadata" introducer="false" skipIntroductionRemovals="false" introducedBy="">
        <address>dynamic</address>
        <paused>false</paused>
        <autoAcceptFolders>false</autoAcceptFolders>
        <maxSendKbps>0</maxSendKbps>
        <maxRecvKbps>0</maxRecvKbps>
        <maxRequestKiB>0</maxRequestKiB>
        <remoteGUIPort>0</remoteGUIPort>
    </device>
    <gui enabled="true" tls="false" debugging="false">
        <address>127.0.0.1:8384</address>
        <apikey>k1dnz1Dd0rzTBjjFFh7CXPnrF12C49B1</apikey>
        <theme>default</theme>
    </gui>
    <ldap></ldap>
    <options>
        <listenAddress>default</listenAddress>
        <globalAnnounceServer>default</globalAnnounceServer>
        <globalAnnounceEnabled>true</globalAnnounceEnabled>
        <localAnnounceEnabled>true</localAnnounceEnabled>
        <localAnnouncePort>21027</localAnnouncePort>
        <localAnnounceMCAddr>[ff12::8384]:21027</localAnnounceMCAddr>
        <maxSendKbps>0</maxSendKbps>
        <maxRecvKbps>0</maxRecvKbps>
        <reconnectionIntervalS>60</reconnectionIntervalS>
        <relaysEnabled>true</relaysEnabled>
        <relayReconnectIntervalM>10</relayReconnectIntervalM>
        <startBrowser>true</startBrowser>
        <natEnabled>true</natEnabled>
        <natLeaseMinutes>60</natLeaseMinutes>
        <natRenewalMinutes>30</natRenewalMinutes>
        <natTimeoutSeconds>10</natTimeoutSeconds>
        <urAccepted>0</urAccepted>
        <urSeen>0</urSeen>
        <urUniqueID></urUniqueID>
        <urURL>https://data.syncthing.net/newdata</urURL>
        <urPostInsecurely>false</urPostInsecurely>
        <urInitialDelayS>1800</urInitialDelayS>
        <restartOnWakeup>true</restartOnWakeup>
        <autoUpgradeIntervalH>12</autoUpgradeIntervalH>
        <upgradeToPreReleases>false</upgradeToPreReleases>
        <keepTemporariesH>24</keepTemporariesH>
        <cacheIgnoredFiles>false</cacheIgnoredFiles>
        <progressUpdateIntervalS>5</progressUpdateIntervalS>
        <limitBandwidthInLan>false</limitBandwidthInLan>
        <minHomeDiskFree unit="%">1</minHomeDiskFree>
        <releasesURL>https://upgrades.syncthing.net/meta.json</releasesURL>
        <overwriteRemoteDeviceNamesOnConnect>false</overwriteRemoteDeviceNamesOnConnect>
        <tempIndexMinBlocks>10</tempIndexMinBlocks>
        <trafficClass>0</trafficClass>
        <defaultFolderPath>~</defaultFolderPath>
        <setLowPriority>true</setLowPriority>
        <maxFolderConcurrency>0</maxFolderConcurrency>
        <crashReportingURL>https://crash.syncthing.net/newcrash</crashReportingURL>
        <crashReportingEnabled>true</crashReportingEnabled>
        <stunKeepaliveStartS>180</stunKeepaliveStartS>
        <stunKeepaliveMinS>20</stunKeepaliveMinS>
        <stunServer>default</stunServer>
        <databaseTuning>auto</databaseTuning>
        <maxConcurrentIncomingRequestKiB>0</maxConcurrentIncomingRequestKiB>
    </options>
</configuration>
.ft P
.fi
.UNINDENT
.UNINDENT
.SH CONFIGURATION ELEMENT
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
<configuration version="30">
    <folder></folder>
    <device></device>
    <gui></gui>
    <ldap></ldap>
    <options></options>
    <ignoredDevice>5SYI2FS\-LW6YAXI\-JJDYETS\-NDBBPIO\-256MWBO\-XDPXWVG\-24QPUM4\-PDW4UQU</ignoredDevice>
    <ignoredFolder>bd7q3\-zskm5</ignoredFolder>
</configuration>
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
This is the root element. It has one attribute:
.INDENT 0.0
.TP
.B version
The config version. Increments whenever a change is made that requires
migration from previous formats.
.UNINDENT
.sp
It contains the elements described in the following sections and these two
additional child elements:
.INDENT 0.0
.TP
.B ignoredDevice
Contains the ID of the device that should be ignored. Connection attempts
from this device are logged to the console but never displayed in the web
GUI.
.TP
.B ignoredFolder
Contains the ID of the folder that should be ignored. This folder will
always be skipped when advertised from a remote device, i.e. this will be
logged, but there will be no dialog shown in the web GUI.
.UNINDENT
.SH FOLDER ELEMENT
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
<folder id="default" label="Default Folder" path="/Users/jb/Sync/" type="sendreceive" rescanIntervalS="3600" fsWatcherEnabled="true" fsWatcherDelayS="10" ignorePerms="false" autoNormalize="true">
    <filesystemType>basic</filesystemType>
    <device id="3LT2GA5\-CQI4XJM\-WTZ264P\-MLOGMHL\-MCRLDNT\-MZV4RD3\-KA745CL\-OGAERQZ"></device>
    <minDiskFree unit="%">1</minDiskFree>
    <versioning></versioning>
    <copiers>0</copiers>
    <pullerMaxPendingKiB>0</pullerMaxPendingKiB>
    <hashers>0</hashers>
    <order>random</order>
    <ignoreDelete>false</ignoreDelete>
    <scanProgressIntervalS>0</scanProgressIntervalS>
    <pullerPauseS>0</pullerPauseS>
    <maxConflicts>\-1</maxConflicts>
    <disableSparseFiles>false</disableSparseFiles>
    <disableTempIndexes>false</disableTempIndexes>
    <paused>false</paused>
    <weakHashThresholdPct>25</weakHashThresholdPct>
    <markerName>.stfolder</markerName>
    <copyOwnershipFromParent>false</copyOwnershipFromParent>
    <modTimeWindowS>0</modTimeWindowS>
    <maxConcurrentWrites>2</maxConcurrentWrites>
    <disableFsync>false</disableFsync>
    <blockPullOrder>standard</blockPullOrder>
    <copyRangeMethod>standard</copyRangeMethod>
</folder>
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
One or more \fBfolder\fP elements must be present in the file. Each element
describes one folder. The following attributes may be set on the \fBfolder\fP
element:
.INDENT 0.0
.TP
.B id
The folder ID, which must be unique. (mandatory)
.TP
.B label
The label of a folder is a human readable and descriptive local name. May
be different on each device, empty, and/or identical to other folder
labels. (optional)
.TP
.B path
The path to the directory where the folder is stored on this
device; not sent to other devices. (mandatory)
.TP
.B type
Controls how the folder is handled by Syncthing. Possible values are:
.INDENT 7.0
.TP
.B sendreceive
The folder is in default mode. Sending local and accepting remote changes.
Note that this type was previously called “readwrite” which is deprecated
but still accepted in incoming configs.
.TP
.B sendonly
The folder is in “send only” mode – it will not be modified by
Syncthing on this device.
Note that this type was previously called “readonly” which is deprecated
but still accepted in incoming configs.
.TP
.B receiveonly
The folder is in “receive only” mode – it will not propagate
changes to other devices.
.UNINDENT
.TP
.B rescanIntervalS
The rescan interval, in seconds. Can be set to \fB0\fP to disable when external
plugins are used to trigger rescans.
.TP
.B fsWatcherEnabled
If set to \fBtrue\fP, this detects changes to files in the folder and scans them.
.UNINDENT
.INDENT 0.0
.TP
.B fsWatcherDelayS
The duration during which changes detected are accumulated, before a scan is
scheduled (only takes effect if \fBfsWatcherEnabled\fP is set to \fBtrue\fP).
.TP
.B ignorePerms
True if the folder should ignore permissions.
.TP
.B autoNormalize
Automatically correct UTF\-8 normalization errors found in file names.
.UNINDENT
.sp
The following child elements may exist:
.INDENT 0.0
.TP
.B device
These must have the \fBid\fP attribute and can have an \fBintroducedBy\fP attribute,
identifying the device that introduced us to share this folder with the given device.
If the original introducer unshares this folder with this device, our device will follow
and unshare the folder (subject to skipIntroductionRemovals being false on the introducer device).
All mentioned devices are those that will be sharing the folder in question.
Each mentioned device must have a separate \fBdevice\fP element later in the file.
It is customary that the local device ID is included in all folders.
Syncthing will currently add this automatically if it is not present in
the configuration file.
.TP
.B minDiskFree
The minimum required free space that should be available on the disk this folder
resides. The folder will be stopped when the value drops below the threshold. Accepted units are
\fB%\fP, \fBkB\fP, \fBMB\fP, \fBGB\fP and \fBTB\fP\&. Set to zero to disable.
.TP
.B versioning
Specifies a versioning configuration.
.UNINDENT
.sp
\fBSEE ALSO:\fP
.INDENT 0.0
.INDENT 3.5
versioning
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B copiers, pullers, hashers
The number of copier, puller and hasher routines to use, or \fB0\fP for the
system determined optimums. These are low level performance options for
advanced users only; do not change unless requested to or you’ve actually
read and understood the code yourself. :)
.TP
.B order
The order in which needed files should be pulled from the cluster.
The possibles values are:
.INDENT 7.0
.TP
.B random
Pull files in random order. This optimizes for balancing resources among
the devices in a cluster.
.TP
.B alphabetic
Pull files ordered by file name alphabetically.
.TP
.B smallestFirst, largestFirst
Pull files ordered by file size; smallest and largest first respectively.
.TP
.B oldestFirst, newestFirst
Pull files ordered by modification time; oldest and newest first
respectively.
.UNINDENT
.sp
Note that the scanned files are sent in batches and the sorting is applied
only to the already discovered files. This means the sync might start with
a 1 GB file even if there is 1 KB file available on the source device until
the 1 KB becomes known to the pulling device.
.TP
.B ignoreDelete
.
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
Enabling this is highly discouraged \- use at your own risk. You have been warned.
.UNINDENT
.UNINDENT
.sp
When set to \fBtrue\fP, this device will pretend not to see instructions to
delete files from other devices.
.TP
.B scanProgressIntervalS
The interval in seconds with which scan progress information is sent to the GUI. Setting to \fB0\fP
will cause Syncthing to use the default value of two.
.TP
.B pullerPauseS
Tweak for rate limiting the puller when it retries pulling files. Don’t
change this unless you know what you’re doing.
.TP
.B maxConflicts
The maximum number of conflict copies to keep around for any given file.
The default, \fB\-1\fP, means an unlimited number. Setting this to \fB0\fP disables
conflict copies altogether.
.TP
.B disableSparseFiles
By default, blocks containing all zeros are not written, causing files
to be sparse on filesystems that support this feature. When set to \fBtrue\fP,
sparse files will not be created.
.TP
.B disableTempIndexes
By default, devices exchange information about blocks available in
transfers that are still in progress, which allows other devices to
download parts of files that are not yet fully downloaded on your own
device, essentially making transfers more torrent like. When set to
\fBtrue\fP, such information is not exchanged for this folder.
.TP
.B paused
True if this folder is (temporarily) suspended.
.TP
.B weakHashThresholdPct
Use weak hash if more than the given percentage of the file has changed. Set
to \fB\-1\fP to always use weak hash. Default is \fB25\fP\&.
.TP
.B markerName
Name of a directory or file in the folder root to be used as
marker\-faq\&. Default is \fB\&.stfolder\fP\&.
.TP
.B copyOwnershipFromParent
On Unix systems, tries to copy file/folder ownership from the parent directory (the directory it’s located in).
Requires running Syncthing as a privileged user, or granting it additional capabilities (e.g. CAP_CHOWN on Linux).
.TP
.B modTimeWindowS
Allowed modification timestamp difference when comparing files for
equivalence. To be used on file systems which have unstable
modification timestamps that might change after being recorded
during the last write operation. Default is \fB2\fP on Android when the
folder is located on a FAT partition, and \fB0\fP otherwise.
.TP
.B maxConcurrentWrites
Maximum number of concurrent write operations while syncing. Increasing this might increase or
decrease disk performance, depending on the underlying storage. Default is \fB2\fP\&.
.UNINDENT
.sp
disableFsync
.INDENT 0.0
.INDENT 3.5
.sp
\fBWARNING:\fP
.INDENT 0.0
.INDENT 3.5
This is a known insecure option \- use at your own risk.
.UNINDENT
.UNINDENT
.sp
Disables committing file operations to disk before recording them in the database.
Disabling fsync can lead to data corruption.
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B blockPullOrder
Order in which the blocks of a file are downloaded. This option controls how quickly different parts of the
file spread between the connected devices, at the cost of causing strain on the storage.
.sp
Available options:
.INDENT 7.0
.TP
.B standard (default):
The blocks of a file are split into N equal continuous sequences, where N is the number of connected
devices. Each device starts downloading its own sequence, after which it picks other devices
sequences at random. Provides acceptable data distribution and minimal spinning disk strain.
.TP
.B random:
The blocks of a file are downloaded in a random order. Provides great data distribution, but very taxing on
spinning disk drives.
.TP
.B inOrder:
The blocks of a file are downloaded sequentially, from start to finish. Spinning disk drive friendly, but provides
no improvements to data distribution.
.UNINDENT
.TP
.B copyRangeMethod
Provides a choice of method for copying data between files. This can be used to optimise copies on network
filesystems, improve speed of large copies or clone the data using copy\-on\-write functionality if the underlying
filesystem supports it.
.sp
See folder\-copyRangeMethod for details.
.UNINDENT
.SH DEVICE ELEMENT
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
<device id="5SYI2FS\-LW6YAXI\-JJDYETS\-NDBBPIO\-256MWBO\-XDPXWVG\-24QPUM4\-PDW4UQU" name="syno" compression="metadata" introducer="false" skipIntroductionRemovals="false" introducedBy="2CYF2WQ\-AKZO2QZ\-JAKWLYD\-AGHMQUM\-BGXUOIS\-GYILW34\-HJG3DUK\-LRRYQAR">
    <address>dynamic</address>
    <paused>false</paused>
    <autoAcceptFolders>false</autoAcceptFolders>
    <maxSendKbps>0</maxSendKbps>
    <maxRecvKbps>0</maxRecvKbps>
    <maxRequestKiB>0</maxRequestKiB>
    <remoteGUIPort>0</remoteGUIPort>
</device>
<device id="2CYF2WQ\-AKZO2QZ\-JAKWLYD\-AGHMQUM\-BGXUOIS\-GYILW34\-HJG3DUK\-LRRYQAR" name="syno local" compression="metadata" introducer="false" skipIntroductionRemovals="false" introducedBy="">
    <address>tcp://192.0.2.1:22001</address>
    <paused>true</paused>
    <allowedNetwork>192.168.0.0/16</allowedNetwork>
    <autoAcceptFolders>false</autoAcceptFolders>
    <maxSendKbps>100</maxSendKbps>
    <maxRecvKbps>100</maxRecvKbps>
    <maxRequestKiB>65536</maxRequestKiB>
    <remoteGUIPort>8384</remoteGUIPort>
</device>
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
One or more \fBdevice\fP elements must be present in the file. Each element
describes a device participating in the cluster. It is customary to include a
\fBdevice\fP element for the local device; Syncthing will currently add one if
it is not present. The following attributes may be set on the \fBdevice\fP
element:
.INDENT 0.0
.TP
.B id
The device ID\&. (mandatory)
.TP
.B name
A friendly name for the device. (optional)
.TP
.B compression
Whether to use protocol compression when sending messages to this device.
The possible values are:
.INDENT 7.0
.TP
.B metadata
Compress metadata packets, such as index information. Metadata is
usually very compression friendly so this is a good default.
.TP
.B always
Compress all packets, including file data. This is recommended if the
folders contents are mainly compressible data such as documents or
text files.
.TP
.B never
Disable all compression.
.UNINDENT
.TP
.B introducer
Set to true if this device should be trusted as an introducer, i.e. we
should copy their list of devices per folder when connecting.
.UNINDENT
.sp
\fBSEE ALSO:\fP
.INDENT 0.0
.INDENT 3.5
introducer
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B skipIntroductionRemovals
Set to true if you wish to follow only introductions and not de\-introductions.
For example, if this is set, we would not remove a device that we were introduced
to even if the original introducer is no longer listing the remote device as known.
.TP
.B introducedBy
Defines which device has introduced us to this device. Used only for following de\-introductions.
.TP
.B certName
The device certificate’s common name, if it is not the default “syncthing”.
.UNINDENT
.sp
From the following child elements at least one \fBaddress\fP child must exist.
.INDENT 0.0
.TP
.B address
Contains an address or host name to use when attempting to connect to this device.
Entries other than \fBdynamic\fP need a protocol specific prefix. For the TCP protocol
the prefixes \fBtcp://\fP (dual\-stack), \fBtcp4://\fP (IPv4 only) or \fBtcp6://\fP (IPv6 only) can be used.
The prefixes for the QUIC protocol are analogous: \fBquic://\fP, \fBquic4://\fP and \fBquic6://\fP
Note that IP addresses need not use IPv4 or IPv6 prefixes; these are optional. Accepted formats are:
.INDENT 7.0
.TP
.B IPv4 address (\fBtcp://192.0.2.42\fP)
The default port (22000) is used.
.TP
.B IPv4 address and port (\fBtcp://192.0.2.42:12345\fP)
The address and port is used as given.
.TP
.B IPv6 address (\fBtcp://[2001:db8::23:42]\fP)
The default port (22000) is used. The address must be enclosed in
square brackets.
.TP
.B IPv6 address and port (\fBtcp://[2001:db8::23:42]:12345\fP)
The address and port is used as given. The address must be enclosed in
square brackets.
.TP
.B Host name (\fBtcp6://fileserver\fP)
The host name will be used on the default port (22000) and connections
will be attempted only via IPv6.
.TP
.B Host name and port (\fBtcp://fileserver:12345\fP)
The host name will be used on the given port and connections will be
attempted via both IPv4 and IPv6, depending on name resolution.
.TP
.B \fBdynamic\fP
The word \fBdynamic\fP (without any prefix) means to use local and
global discovery to find the device.
.UNINDENT
.sp
You can set multiple addresses \fIand\fP combine it with the \fBdynamic\fP keyword
for example:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
<device id="...">
    <address>tcp://192.0.2.1:22001</address>
    <address>quic://192.0.1.254:22000</address>
    <address>dynamic</address>
</device>
.ft P
.fi
.UNINDENT
.UNINDENT
.TP
.B paused
True if synchronization with this devices is (temporarily) suspended.
.TP
.B allowedNetwork
If given, this restricts connections to this device to only this network
(see allowed\-networks).
.TP
.B maxSendKbps
Maximum send rate to use for this device. Unit is kibibytes/second, despite
the config name looking like kilobits/second.
.TP
.B maxRecvKbps
Maximum receive rate to use for this device. Unit is kibibytes/second,
despite the config name looking like kilobits/second.
.TP
.B maxRequestKiB
Maximum amount of data to have outstanding in requests towards this device.
Unit is kibibytes.
.TP
.B remoteGUIPort
If set to a positive integer, the GUI will display an HTTP link to the IP
address which is currently used for synchronization.  Only the TCP port is
exchanged for the value specified here.  Note that any port forwarding or
firewall settings need to be done manually and the link will probably not
work for link\-local IPv6 addresses because of modern browser limitations.
.UNINDENT
.SH GUI ELEMENT
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
<gui enabled="true" tls="false" debugging="false">
    <address>127.0.0.1:8384</address>
    <apikey>l7jSbCqPD95JYZ0g8vi4ZLAMg3ulnN1b</apikey>
    <theme>default</theme>
</gui>
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
There must be exactly one \fBgui\fP element. The GUI configuration is also used
by the rest\-api and the event\-api\&. The following attributes may
be set on the \fBgui\fP element:
.INDENT 0.0
.TP
.B enabled
If not \fBtrue\fP, the GUI and API will not be started.
.TP
.B tls
If set to \fBtrue\fP, TLS (HTTPS) will be enforced. Non\-HTTPS requests will
be redirected to HTTPS. When set to \fBfalse\fP, TLS connections are
still possible but not required.
.TP
.B debugging
This enables profiling and additional debugging endpoints in the rest\-api\&.
.UNINDENT
.sp
The following child elements may be present:
.INDENT 0.0
.TP
.B address
Set the listen address. One address element must be present. Allowed address formats are:
.INDENT 7.0
.TP
.B IPv4 address and port (\fB127.0.0.1:8384\fP)
The address and port are used as given.
.TP
.B IPv6 address and port (\fB[::1]:8384\fP)
The address and port are used as given. The address must be enclosed in
square brackets.
.TP
.B Wildcard and port (\fB0.0.0.0:12345\fP, \fB[::]:12345\fP, \fB:12345\fP)
These are equivalent and will result in Syncthing listening on all
interfaces via both IPv4 and IPv6.
.TP
.B UNIX socket location (\fB/var/run/st.sock\fP)
If the address is an absolute path it is interpreted as the path to a UNIX socket.
.UNINDENT
.TP
.B unixSocketPermissions
When \fBaddress\fP is set to a UNIX socket location, set this to an octal value
to override the default permissions of the socket.
.TP
.B user
Set to require authentication.
.TP
.B password
Contains the bcrypt hash of the real password.
.TP
.B apikey
If set, this is the API key that enables usage of the REST interface.
.TP
.B insecureAdminAccess
If true, this allows access to the web GUI from outside (i.e. not localhost)
without authorization. A warning will displayed about this setting on startup.
.TP
.B theme
The name of the theme to use.
.TP
.B authMode
Authentication mode to use. If not present, the authentication mode (static)
is controlled by the presence of user/password fields for backward compatibility.
.INDENT 7.0
.TP
.B static
Authentication using user and password.
.TP
.B ldap
LDAP authentication. Requires ldap top level config section to be present.
.UNINDENT
.UNINDENT
.SH LDAP ELEMENT
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
<ldap>
    <address>localhost:389</address>
    <bindDN>cn=%s,ou=users,dc=syncthing,dc=net</bindDN>
    <transport>nontls</transport>
    <insecureSkipVerify>false</insecureSkipVerify>
</ldap>
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The \fBldap\fP element contains LDAP configuration options.
.INDENT 0.0
.TP
.B address
LDAP server address (server:port).
.TP
.B bindDN
BindDN for user authentication.
Special \fB%s\fP variable should be used to pass username to LDAP.
.UNINDENT
.sp
transport
.INDENT 0.0
.INDENT 3.5
.INDENT 0.0
.TP
.B nontls
Non secure connection.
.TP
.B tls
TLS secured connection.
.TP
.B starttls
StartTLS connection mode.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B insecureSkipVerify
Skip verification (\fBtrue\fP or \fBfalse\fP).
.UNINDENT
.SH OPTIONS ELEMENT
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
<options>
    <listenAddress>default</listenAddress>
    <globalAnnounceServer>default</globalAnnounceServer>
    <globalAnnounceEnabled>true</globalAnnounceEnabled>
    <localAnnounceEnabled>true</localAnnounceEnabled>
    <localAnnouncePort>21027</localAnnouncePort>
    <localAnnounceMCAddr>[ff12::8384]:21027</localAnnounceMCAddr>
    <maxSendKbps>0</maxSendKbps>
    <maxRecvKbps>0</maxRecvKbps>
    <reconnectionIntervalS>60</reconnectionIntervalS>
    <relaysEnabled>true</relaysEnabled>
    <relayReconnectIntervalM>10</relayReconnectIntervalM>
    <startBrowser>true</startBrowser>
    <natEnabled>true</natEnabled>
    <natLeaseMinutes>60</natLeaseMinutes>
    <natRenewalMinutes>30</natRenewalMinutes>
    <natTimeoutSeconds>10</natTimeoutSeconds>
    <urAccepted>0</urAccepted>
    <urSeen>0</urSeen>
    <urUniqueID></urUniqueID>
    <urURL>https://data.syncthing.net/newdata</urURL>
    <urPostInsecurely>false</urPostInsecurely>
    <urInitialDelayS>1800</urInitialDelayS>
    <restartOnWakeup>true</restartOnWakeup>
    <autoUpgradeIntervalH>12</autoUpgradeIntervalH>
    <upgradeToPreReleases>false</upgradeToPreReleases>
    <keepTemporariesH>24</keepTemporariesH>
    <cacheIgnoredFiles>false</cacheIgnoredFiles>
    <progressUpdateIntervalS>5</progressUpdateIntervalS>
    <limitBandwidthInLan>false</limitBandwidthInLan>
    <minHomeDiskFree unit="%">1</minHomeDiskFree>
    <releasesURL>https://upgrades.syncthing.net/meta.json</releasesURL>
    <overwriteRemoteDeviceNamesOnConnect>false</overwriteRemoteDeviceNamesOnConnect>
    <tempIndexMinBlocks>10</tempIndexMinBlocks>
    <trafficClass>0</trafficClass>
    <defaultFolderPath>~</defaultFolderPath>
    <setLowPriority>true</setLowPriority>
    <maxFolderConcurrency>0</maxFolderConcurrency>
    <crashReportingURL>https://crash.syncthing.net/newcrash</crashReportingURL>
    <crashReportingEnabled>true</crashReportingEnabled>
    <stunKeepaliveStartS>180</stunKeepaliveStartS>
    <stunKeepaliveMinS>20</stunKeepaliveMinS>
    <stunServer>default</stunServer>
    <databaseTuning>auto</databaseTuning>
    <maxConcurrentIncomingRequestKiB>0</maxConcurrentIncomingRequestKiB>
</options>
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The \fBoptions\fP element contains all other global configuration options.
.INDENT 0.0
.TP
.B listenAddress
The listen address for incoming sync connections. See
\fI\%Listen Addresses\fP for the allowed syntax.
.TP
.B globalAnnounceServer
A URI to a global announce (discovery) server, or the word \fBdefault\fP to
include the default servers. Any number of globalAnnounceServer elements
may be present. The syntax for non\-default entries is that of an HTTP or
HTTPS URL. A number of options may be added as query options to the URL:
\fBinsecure\fP to prevent certificate validation (required for HTTP URLs)
and \fBid=<device ID>\fP to perform certificate pinning. The device ID to
use is printed by the discovery server on startup.
.TP
.B globalAnnounceEnabled
Whether to announce this device to the global announce (discovery) server,
and also use it to look up other devices.
.TP
.B localAnnounceEnabled
Whether to send announcements to the local LAN, also use such
announcements to find other devices.
.TP
.B localAnnouncePort
The port on which to listen and send IPv4 broadcast announcements to.
.TP
.B localAnnounceMCAddr
The group address and port to join and send IPv6 multicast announcements on.
.TP
.B maxSendKbps
Outgoing data rate limit, in kibibytes per second.
.TP
.B maxRecvKbps
Incoming data rate limits, in kibibytes per second.
.TP
.B reconnectionIntervalS
The number of seconds to wait between each attempt to connect to currently
unconnected devices.
.TP
.B relaysEnabled
When \fBtrue\fP, relays will be connected to and potentially used for device to device connections.
.TP
.B relayReconnectIntervalM
Sets the interval, in minutes, between relay reconnect attempts.
.TP
.B startBrowser
Whether to attempt to start a browser to show the GUI when Syncthing starts.
.TP
.B natEnabled
Whether to attempt to perform a UPnP and NAT\-PMP port mapping for
incoming sync connections.
.TP
.B natLeaseMinutes
Request a lease for this many minutes; zero to request a permanent lease.
.TP
.B natRenewalMinutes
Attempt to renew the lease after this many minutes.
.TP
.B natTimeoutSeconds
When scanning for UPnP devices, wait this long for responses.
.TP
.B urAccepted
Whether the user has accepted to submit anonymous usage data. The default,
\fB0\fP, mean the user has not made a choice, and Syncthing will ask at some
point in the future. \fB\-1\fP means no, a number above zero means that that
version of usage reporting has been accepted.
.TP
.B urSeen
The highest usage reporting version that has already been shown in the web GUI.
.TP
.B urUniqueID
The unique ID sent together with the usage report. Generated when usage
reporting is enabled.
.TP
.B urURL
The URL to post usage report data to, when enabled.
.TP
.B urPostInsecurely
When true, the UR URL can be http instead of https, or have a self\-signed
certificate. The default is \fBfalse\fP\&.
.TP
.B urInitialDelayS
The time to wait from startup for the first usage report to be sent. Allows
the system to stabilize before reporting statistics.
.TP
.B restartOnWakeup
Whether to perform a restart of Syncthing when it is detected that we are
waking from sleep mode (i.e. an unfolding laptop).
.TP
.B autoUpgradeIntervalH
Check for a newer version after this many hours. Set to \fB0\fP to disable
automatic upgrades.
.TP
.B upgradeToPreReleases
If \fBtrue\fP, automatic upgrades include release candidates (see
releases).
.TP
.B keepTemporariesH
Keep temporary failed transfers for this many hours. While the temporaries
are kept, the data they contain need not be transferred again.
.TP
.B cacheIgnoredFiles
Whether to cache the results of ignore pattern evaluation. Performance
at the price of memory. Defaults to \fBfalse\fP as the cost for evaluating
ignores is usually not significant.
.TP
.B progressUpdateIntervalS
How often in seconds the progress of ongoing downloads is made available to
the GUI.
.TP
.B limitBandwidthInLan
Whether to apply bandwidth limits to devices in the same broadcast domain
as the local device.
.TP
.B minHomeDiskFree
The minimum required free space that should be available on the
partition holding the configuration and index. Accepted units are \fB%\fP, \fBkB\fP,
\fBMB\fP, \fBGB\fP and \fBTB\fP\&.
.TP
.B releasesURL
The URL from which release information is loaded, for automatic upgrades.
.TP
.B alwaysLocalNet
Network that should be considered as local given in CIDR notation.
.TP
.B overwriteRemoteDeviceNamesOnConnect
If set, device names will always be overwritten with the name given by
remote on each connection. By default, the name that the remote device
announces will only be adopted when a name has not already been set.
.TP
.B tempIndexMinBlocks
When exchanging index information for incomplete transfers, only take
into account files that have at least this many blocks.
.TP
.B unackedNotificationID
ID of a notification to be displayed in the web GUI. Will be removed once
the user acknowledged it (e.g. an transition notice on an upgrade).
.TP
.B trafficClass
Specify a type of service (TOS)/traffic class of outgoing packets.
.TP
.B stunServer
Server to be used for STUN, given as ip:port. The keyword \fBdefault\fP gets
expanded to
\fBstun.callwithus.com:3478\fP, \fBstun.counterpath.com:3478\fP,
\fBstun.counterpath.net:3478\fP, \fBstun.ekiga.net:3478\fP,
\fBstun.ideasip.com:3478\fP, \fBstun.internetcalls.com:3478\fP,
\fBstun.schlund.de:3478\fP, \fBstun.sipgate.net:10000\fP,
\fBstun.sipgate.net:3478\fP, \fBstun.voip.aebc.com:3478\fP,
\fBstun.voiparound.com:3478\fP, \fBstun.voipbuster.com:3478\fP,
\fBstun.voipstunt.com:3478\fP and \fBstun.xten.com:3478\fP (this is the default).
.TP
.B stunKeepaliveSeconds
Interval in seconds between contacting a STUN server to
maintain NAT mapping. Default is \fB24\fP and you can set it to \fB0\fP to
disable contacting STUN servers.
.TP
.B defaultFolderPath
The UI will propose to create new folders at this path. This can be disabled by
setting this to an empty string.
.UNINDENT
.INDENT 0.0
.TP
.B setLowPriority
Syncthing will attempt to lower its process priority at startup.
Specifically: on Linux, set itself to a separate process group, set the
niceness level of that process group to nine and the I/O priority to
best effort level five; on other Unixes, set the process niceness level
to nine; on Windows, set the process priority class to below normal. To
disable this behavior, for example to control process priority yourself
as part of launching Syncthing, set this option to \fBfalse\fP\&.
.UNINDENT
.SS Listen Addresses
.sp
The following address types are accepted in sync protocol listen addresses.
If you want Syncthing to listen on multiple addresses, you can either: add
multiple \fB<listenAddress>\fP tags in the configuration file or enter several
addresses separated by commas in the GUI.
.INDENT 0.0
.TP
.B Default listen addresses (\fBdefault\fP)
This is equivalent to \fBtcp://0.0.0.0:22000\fP, \fBquic://0.0.0.0:22000\fP
and \fBdynamic+https://relays.syncthing.net/endpoint\fP\&.
.TP
.B TCP wildcard and port (\fBtcp://0.0.0.0:22000\fP, \fBtcp://:22000\fP)
These are equivalent and will result in Syncthing listening on all
interfaces, IPv4 and IPv6, on the specified port.
.TP
.B TCP IPv4 wildcard and port (\fBtcp4://0.0.0.0:22000\fP, \fBtcp4://:22000\fP)
These are equivalent and will result in Syncthing listening on all
interfaces via IPv4 only.
.TP
.B TCP IPv4 address and port (\fBtcp4://192.0.2.1:22000\fP)
This results in Syncthing listening on the specified address and port, IPv4
only.
.TP
.B TCP IPv6 wildcard and port (\fBtcp6://[::]:22000\fP, \fBtcp6://:22000\fP)
These are equivalent and will result in Syncthing listening on all
interfaces via IPv6 only.
.TP
.B TCP IPv6 address and port (\fBtcp6://[2001:db8::42]:22000\fP)
This results in Syncthing listening on the specified address and port, IPv6
only.
.TP
.B QUIC address and port (e.g. \fBquic://0.0.0.0:22000\fP)
Syntax is the same as for TCP, also \fBquic4\fP and \fBquic6\fP can be used.
.TP
.B Static relay address (\fBrelay://192.0.2.42:22067?id=abcd123...\fP)
Syncthing will connect to and listen for incoming connections via the
specified relay address.
.INDENT 7.0
.INDENT 3.5
.SS Todo
.sp
Document available URL parameters.
.UNINDENT
.UNINDENT
.TP
.B Dynamic relay pool (\fBdynamic+https://192.0.2.42/relays\fP)
Syncthing will fetch the specified HTTPS URL, parse it for a JSON payload
describing relays, select a relay from the available ones and listen via
that as if specified as a static relay above.
.INDENT 7.0
.INDENT 3.5
.SS Todo
.sp
Document available URL parameters.
.UNINDENT
.UNINDENT
.UNINDENT
.SH SYNCING CONFIGURATION FILES
.sp
Syncing configuration files between devices (such that multiple devices are
using the same configuration files) can cause issues. This is easy to do
accidentally if you sync your home folder between devices. A common symptom
of syncing configuration files is two devices ending up with the same Device ID.
.sp
If you want to use Syncthing to backup your configuration files, it is recommended
that the files you are backing up are in a folder\-sendonly to prevent other
devices from overwriting the per device configuration. The folder on the remote
device(s) should not be used as configuration for the remote devices.
.sp
If you’d like to sync your home folder in non\-send only mode, you may add the
folder that stores the configuration files to the ignore list\&.
If you’d also like to backup your configuration files, add another folder in
send only mode for just the configuration folder.
.SH AUTHOR
The Syncthing Authors
.SH COPYRIGHT
2014-2019, The Syncthing Authors
.\" Generated by docutils manpage writer.
.