Provided by: syncthing_1.18.0~ds1-3ubuntu0.3_amd64 
NAME
syncthing-config - Syncthing Configuration
SYNOPSIS
$HOME/.config/syncthing
$HOME/Library/Application Support/Syncthing
%LOCALAPPDATA%\Syncthing
DESCRIPTION
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.
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 $HOME/.config/syncthing
(Unix-like), $HOME/Library/Application Support/Syncthing (Mac), or %LOCALAPPDATA%\Syncthing (Windows). It
can be changed at runtime using the --config flag. In this directory the following files are located:
config.xml
The configuration file, in XML format.
cert.pem, key.pem
The device’s ECDSA public and private key. These form the basis for the device ID. The key must be
kept private.
https-cert.pem, https-key.pem
The certificate and key for HTTPS GUI connections. These may be replaced with a custom certificate
for HTTPS as desired.
csrftokens.txt
A list of recently issued CSRF tokens (for protection against browser cross site request forgery).
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):
• If a database exists in the old default location, that location is still used.
• If $XDG_DATA_HOME is set, use $XDG_DATA_HOME/syncthing.
• If ~/.local/share/syncthing exists, use that location.
• Use the old default location (same as config).
The location of the database can be changed using the --data flag. The --home flag sets both config and
database locations at the same time. The database contains the following files:
index-*.db
A directory holding the database with metadata and hashes of the files currently on disk and
available from peers.
CONFIG FILE FORMAT
The following shows an example of a default configuration file (IDs will differ):
NOTE:
The config examples are present for illustration. Do not copy them entirely to use as your config.
They are likely out-of-date and the values may no longer correspond to the defaults.
<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>
CONFIGURATION ELEMENT
<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>
This is the root element. It has one attribute:
version
The config version. Increments whenever a change is made that requires migration from previous
formats.
It contains the elements described in the following sections and these two additional child elements:
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.
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 about it in
the web GUI.
FOLDER ELEMENT
<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>
One or more folder elements must be present in the file. Each element describes one folder. The following
attributes may be set on the folder element:
id The folder ID, must be unique. (mandatory)
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)
path The path to the directory where the folder is stored on this device; not sent to other devices.
(mandatory)
type Controls how the folder is handled by Syncthing. Possible values are:
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.
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.
receiveonly
The folder is in “receive only” mode – it will not propagate changes to other devices.
rescanIntervalS
The rescan interval, in seconds. Can be set to zero to disable when external plugins are used to
trigger rescans.
fsWatcherEnabled
If enabled this detects changes to files in the folder and scans them.
fsWatcherDelayS
The duration during which changes detected are accumulated, before a scan is scheduled (only takes
effect if fsWatcherEnabled is true).
ignorePerms
True if the folder should ignore permissions.
autoNormalize
Automatically correct UTF-8 normalization errors found in file names.
The following child elements may exist:
device These must have the id attribute and can have an introducedBy 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 device
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.
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 %, kB, MB, GB
and TB. Set to zero to disable.
versioning
Specifies a versioning configuration.
SEE ALSO:
versioning
copiers, pullers, hashers
The number of copier, puller and hasher routines to use, or zero for the system determined
optimum. 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. :)
order The order in which needed files should be pulled from the cluster. The possibles values are:
random Pull files in random order. This optimizes for balancing resources among the devices in a
cluster.
alphabetic
Pull files ordered by file name alphabetically.
smallestFirst, largestFirst
Pull files ordered by file size; smallest and largest first respectively.
oldestFirst, newestFirst
Pull files ordered by modification time; oldest and newest first respectively.
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.
ignoreDelete
WARNING:
Enabling this is highly not recommended - use at your own risk.
When set to true, this device will pretend not to see instructions to delete files from other
devices.
scanProgressIntervalS
The interval with which scan progress information is sent to the GUI. Zero means the default value
(two seconds).
pullerPauseS
Tweak for rate limiting the puller when it retries pulling files. Don’t change these unless you
know what you’re doing.
maxConflicts
The maximum number of conflict copies to keep around for any given file. The default, -1, means
an unlimited number. Setting this to zero disables conflict copies altogether.
disableSparseFiles
By default, blocks containing all zeroes are not written, causing files to be sparse on
filesystems that support the concept. When set to true, sparse files will not be created.
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 true, such
information is not exchanged for this folder.
paused True if this folder is (temporarily) suspended.
weakHashThresholdPct
Use weak hash if more than the given percentage of the file has changed. Set to -1 to always use
weak hash. Default value is 25.
markerName
Name of a directory or file in the folder root to be used as marker-faq. Default is “.stfolder”.
copyOwnershipFromParent
On Unix systems, tries to copy file/folder ownership from the parent directory (the directory it’s
located in). Requires running Syncthing as privileged user, or granting it additional
capabilities (e.g. CAP_CHOWN on Linux).
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. Defaults to 2 on Android when the folder is located on a FAT partition,
and always to 0 elsewhere.
maxConcurrentWrites
Maximum number of concurrent write operations while syncing. Defaults to 2. Increasing this might
increase or decrease disk performance, depending on the underlying storage.
disableFsync
WARNING:
This is a known insecure option - use at your own risk.
Disables committing file operations to disk before recording them in the database. Disabling fsync
can lead to data corruption.
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.
Available options:
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 it’s own sequence, after which it picks
other devices sequences at random. Provides acceptable data distribution and minimal
spinning disk strain.
random:
The blocks of a file are downloaded in a random order. Provides great data distribution,
but very taxing on spinning disk drives.
inOrder:
The blocks of a file are downloaded sequentially, from start to finish. Spinning disk drive
friendly, but provides no improvements to data distribution.
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.
See folder-copyRangeMethod for details.
DEVICE ELEMENT
<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>
One or more device elements must be present in the file. Each element describes a device participating in
the cluster. It is customary to include a device element for the local device; Syncthing will currently
add one if it is not present. The following attributes may be set on the device element:
id The device ID. (mandatory)
name A friendly name for the device. (optional)
compression
Whether to use protocol compression when sending messages to this device. The possible values
are:
metadata
Compress metadata packets, such as index information. Metadata is usually very compression
friendly so this is a good default.
always Compress all packets, including file data. This is recommended if the folders contents are
mainly compressible data such as documents or text files.
never Disable all compression.
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.
SEE ALSO:
introducer
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.
introducedBy
Defines which device has introduced us to this device. Used only for following de-introductions.
certName
The device certificate common name, if it is not the default “syncthing”.
From following child elements at least one address child must exist.
address
Contains an address or host name to use when attempting to connect to this device. Entries other
than dynamic need a protocol specific prefix. For the TCP protocol the prefixes tcp://
(dual-stack), tcp4:// (IPv4 only) or tcp6:// (IPv6 only) can be used. The prefixes for the QUIC
protocol are analogous: quic://, quic4:// and quic6:// Note that IP addresses need not use IPv4 or
IPv6 prefixes; these are optional. Accepted formats are:
IPv4 address (tcp://192.0.2.42)
The default port (22000) is used.
IPv4 address and port (tcp://192.0.2.42:12345)
The address and port is used as given.
IPv6 address (tcp://[2001:db8::23:42])
The default port (22000) is used. The address must be enclosed in square brackets.
IPv6 address and port (tcp://[2001:db8::23:42]:12345)
The address and port is used as given. The address must be enclosed in square brackets.
Host name (tcp6://fileserver)
The host name will be used on the default port (22000) and connections will be attempted
only via IPv6.
Host name and port (tcp://fileserver:12345)
The host name will be used on the given port and connections will be attempted via both
IPv4 and IPv6, depending on name resolution.
dynamic
The word dynamic (without any prefix) means to use local and global discovery to find the
device.
You can set multiple addresses and combine it with the dynamic keyword for example:
<device id="...">
<address>tcp://192.0.2.1:22001</address>
<address>quic://192.0.1.254:22000</address>
<address>dynamic</address>
</device>
paused True if synchronization with this devices is (temporarily) suspended.
allowedNetwork
If given, this restricts connections to this device to only this network (see allowed-networks).
maxSendKbps
Maximum send rate to use for this device. Unit is kibibytes/second, despite the config name
looking like kilobits/second.
maxRecvKbps
Maximum receive rate to use for this device. Unit is kibibytes/second, despite the config name
looking like kilobits/second.
maxRequestKiB
Maximum amount of data to have outstanding in requests towards this device. Unit is kibibytes.
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.
GUI ELEMENT
<gui enabled="true" tls="false" debugging="false">
<address>127.0.0.1:8384</address>
<apikey>l7jSbCqPD95JYZ0g8vi4ZLAMg3ulnN1b</apikey>
<theme>default</theme>
</gui>
There must be exactly one gui element. The GUI configuration is also used by the rest-api and the
event-api. The following attributes may be set on the gui element:
enabled
If not true, the GUI and API will not be started.
tls If set to true, TLS (HTTPS) will be enforced. Non-HTTPS requests will be redirected to HTTPS. When
this is set to false, TLS connections are still possible but it is not mandatory.
debugging
This enables profiling and additional debugging endpoints in the rest-api.
The following child elements may be present:
address
Set the listen address. One address element must be present. Allowed address formats are:
IPv4 address and port (127.0.0.1:8384)
The address and port is used as given.
IPv6 address and port ([::1]:8384)
The address and port is used as given. The address must be enclosed in square brackets.
Wildcard and port (0.0.0.0:12345, [::]:12345, :12345)
These are equivalent and will result in Syncthing listening on all interfaces via both IPv4
and IPv6.
UNIX socket location (/var/run/st.sock)
If the address is an absolute path it is interpreted as the path to a UNIX socket. (Added
in v0.14.52.)
unixSocketPermissions
In the case that a UNIX socket location is used for address, set this to an octal to override the
default permissions of the socket.
user Set to require authentication.
password
Contains the bcrypt hash of the real password.
apikey If set, this is the API key that enables usage of the REST interface.
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.
theme The name of the theme to use.
authMode
Authentication mode to use. If not present authentication mode (static) is controlled by presence
of user/password fields for backward compatibility.
static Authentication using user and password.
ldap LDAP authentication. Requires ldap top level config section to be present.
LDAP ELEMENT
<ldap>
<address>localhost:389</address>
<bindDN>cn=%s,ou=users,dc=syncthing,dc=net</bindDN>
<transport>nontls</transport>
<insecureSkipVerify>false</insecureSkipVerify>
</ldap>
The ldap element contains LDAP configuration options.
address
LDAP server address (server:port).
bindDN BindDN for user authentication. Special %s variable should be used to pass username to LDAP.
transport
nontls Non secure connection.
tls TLS secured connection.
starttls
StartTLS connection mode.
insecureSkipVerify
Skip verification (true or false).
OPTIONS ELEMENT
<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>
The options element contains all other global configuration options.
listenAddress
The listen address for incoming sync connections. See Listen Addresses for allowed syntax.
globalAnnounceServer
A URI to a global announce (discovery) server, or the word default to include the default servers.
Any number of globalAnnounceServer elements may be present. The syntax for non-default entries is
that of a HTTP or HTTPS URL. A number of options may be added as query options to the URL:
insecure to prevent certificate validation (required for HTTP URLs) and id=<device ID> to perform
certificate pinning. The device ID to use is printed by the discovery server on startup.
globalAnnounceEnabled
Whether to announce this device to the global announce (discovery) server, and also use it to look
up other devices.
localAnnounceEnabled
Whether to send announcements to the local LAN, also use such announcements to find other devices.
localAnnouncePort
The port on which to listen and send IPv4 broadcast announcements to.
localAnnounceMCAddr
The group address and port to join and send IPv6 multicast announcements on.
maxSendKbps
Outgoing data rate limit, in kibibytes per second.
maxRecvKbps
Incoming data rate limits, in kibibytes per second.
reconnectionIntervalS
The number of seconds to wait between each attempt to connect to currently unconnected devices.
relaysEnabled
When true, relays will be connected to and potentially used for device to device connections.
relayReconnectIntervalM
Sets the interval, in minutes, between relay reconnect attempts.
startBrowser
Whether to attempt to start a browser to show the GUI when Syncthing starts.
natEnabled
Whether to attempt to perform a UPnP and NAT-PMP port mapping for incoming sync connections.
natLeaseMinutes
Request a lease for this many minutes; zero to request a permanent lease.
natRenewalMinutes
Attempt to renew the lease after this many minutes.
natTimeoutSeconds
When scanning for UPnP devices, wait this long for responses.
urAccepted
Whether the user has accepted to submit anonymous usage data. The default, 0, mean the user has
not made a choice, and Syncthing will ask at some point in the future. -1 means no, a number above
zero means that that version of usage reporting has been accepted.
urSeen The highest usage reporting version that has already been shown in the web GUI.
urUniqueID
The unique ID sent together with the usage report. Generated when usage reporting is enabled.
urURL The URL to post usage report data to, when enabled.
urPostInsecurely
When true, the UR URL can be http instead of https, or have a self-signed certificate. The default
is false.
urInitialDelayS
The time to wait from startup to the first usage report being sent. Allows the system to stabilize
before reporting statistics.
restartOnWakeup
Whether to perform a restart of Syncthing when it is detected that we are waking from sleep mode
(i.e. a folded up laptop).
autoUpgradeIntervalH
Check for a newer version after this many hours. Set to zero to disable automatic upgrades.
upgradeToPreReleases
If true, automatic upgrades include release candidates (see releases).
keepTemporariesH
Keep temporary failed transfers for this many hours. While the temporaries are kept, the data they
contain need not be transferred again.
cacheIgnoredFiles
Whether to cache the results of ignore pattern evaluation. Performance at the price of memory.
Defaults to false as the cost for evaluating ignores is usually not significant.
progressUpdateIntervalS
How often in seconds the progress of ongoing downloads is made available to the GUI.
limitBandwidthInLan
Whether to apply bandwidth limits to devices in the same broadcast domain as the local device.
minHomeDiskFree
The minimum required free space that should be available on the partition holding the
configuration and index. Accepted units are %, kB, MB, GB and TB.
releasesURL
The URL from which release information is loaded, for automatic upgrades.
alwaysLocalNet
Network that should be considered as local given in CIDR notation.
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.
tempIndexMinBlocks
When exchanging index information for incomplete transfers, only take into account files that have
at least this many blocks.
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).
trafficClass
Specify a type of service (TOS)/traffic class of outgoing packets.
stunServer
Server to be used for STUN, given as ip:port. The keyword default gets expanded to
stun.callwithus.com:3478, stun.counterpath.com:3478, stun.counterpath.net:3478,
stun.ekiga.net:3478, stun.ideasip.com:3478, stun.internetcalls.com:3478, stun.schlund.de:3478,
stun.sipgate.net:10000, stun.sipgate.net:3478, stun.voip.aebc.com:3478, stun.voiparound.com:3478,
stun.voipbuster.com:3478, stun.voipstunt.com:3478 and stun.xten.com:3478 (this is the default).
stunKeepaliveSeconds
Interval in seconds between contacting a STUN server to maintain NAT mapping. Default is 24 and
you can set it to 0 to disable contacting STUN servers.
defaultFolderPath
The UI will propose to create new folders at this path. This can be disabled by setting this to an
empty string.
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 false.
Listen Addresses
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 <listenAddress> tags in the configuration file
or enter several addresses separated by commas in the GUI.
Default listen addresses (default)
This is equivalent to tcp://0.0.0.0:22000, quic://0.0.0.0:22000 and
dynamic+https://relays.syncthing.net/endpoint.
TCP wildcard and port (tcp://0.0.0.0:22000, tcp://:22000)
These are equivalent and will result in Syncthing listening on all interfaces, IPv4 and IPv6, on
the specified port.
TCP IPv4 wildcard and port (tcp4://0.0.0.0:22000, tcp4://:22000)
These are equivalent and will result in Syncthing listening on all interfaces via IPv4 only.
TCP IPv4 address and port (tcp4://192.0.2.1:22000)
This results in Syncthing listening on the specified address and port, IPv4 only.
TCP IPv6 wildcard and port (tcp6://[::]:22000, tcp6://:22000)
These are equivalent and will result in Syncthing listening on all interfaces via IPv6 only.
TCP IPv6 address and port (tcp6://[2001:db8::42]:22000)
This results in Syncthing listening on the specified address and port, IPv6 only.
QUIC address and port (e.g. quic://0.0.0.0:22000)
Syntax is the same as for TCP, also quic4 and quic6 can be used.
Static relay address (relay://192.0.2.42:22067?id=abcd123...)
Syncthing will connect to and listen for incoming connections via the specified relay address.
Todo
Document available URL parameters.
Dynamic relay pool (dynamic+https://192.0.2.42/relays)
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.
Todo
Document available URL parameters.
SYNCING CONFIGURATION FILES
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.
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.
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.
AUTHOR
The Syncthing Authors
COPYRIGHT
2014-2019, The Syncthing Authors