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freshclam.conf(5) Clam AntiVirus freshclam.conf(5)


freshclam.conf - Configuration file for Clam AntiVirus database update tool


The file freshclam.conf configures the Clam AntiVirus Database Updater, freshclam(1).


The file consists of comments and options with arguments. Each line which starts with a hash (#) symbol is ignored by the parser. Options and arguments are case sensitive and of the form Option Argument. The arguments are of the following types:

Boolean value (yes/no or true/false or 1/0).
String without blank characters.
Size in bytes. You can use 'M' or 'm' modifiers for megabytes and 'K' or 'k' for kilobytes.
Unsigned integer.


When an option is not used (hashed or doesn't exist in the configuration file) freshclam takes a default action.

If this option is set freshclam will not run.
Limit the size of the log file. The logger will be automatically disabled if the file is greater than SIZE. Value of 0 disables the limit.
Default: 1M
Log time with each message.
Default: no
Enable logging to Syslog. May be used in combination with UpdateLogFile.
Default: disabled.
Specify the type of syslog messages - please refer to 'man syslog' for facility names.
Default: LOG_LOCAL6
Enable verbose logging.
Default: disabled
Rotate log file. Requires LogFileMaxSize option set prior to this option.
Default: no
This option allows you to save the process identifier of the daemon to a file specified in the argument.
Default: disabled
Path to a directory containing database files.
Default: /var/lib/clamav
Don't fork into background.
Default: no
Enable debug messages in libclamav.
Default: no
Enable logging to a specified file. Highly recommended.
Default: disabled.
When started by root, drop privileges to a specified user.
Default: clamav
Number of database checks per day.
Default: 12
Use DNS to verify the virus database version. FreshClam uses DNS TXT records to verify the versions of the database and software itself. With this directive you can change the database verification domain.
WARNING: Please don't change it unless you're configuring freshclam to use your own database verification domain.
Default: enabled, pointing to
DatabaseMirror specifies to which mirror(s) freshclam should connect. You should have at least one entries: Now that CloudFlare is being used as our Content Delivery Network (CDN), this one domain name works world-wide to direct freshclam to the closest geographic endpoint.
This option allows you to easily point freshclam to private mirrors. If PrivateMirror is set, freshclam does not attempt to use DNS to determine whether its databases are out-of-date, instead it will use the If-Modified-Since request or directly check the headers of the remote database files. For each database, freshclam first attempts to download the CLD file. If that fails, it tries to download the CVD file. This option overrides DatabaseMirror, DNSDatabaseInfo and ScriptedUpdates. It can be used multiple times to provide fall-back mirrors.
Default: disabled
How many attempts (per mirror) to make before giving up.
Default: 3 (per mirror)
With this option you can control scripted updates. It's highly recommended to keep it enabled.
Default: yes
With this option enabled, freshclam will attempt to load new databases into memory to make sure they are properly handled by libclamav before replacing the old ones.
Default: enabled
By default freshclam will keep the local databases (.cld) uncompressed to make their handling faster. With this option you can enable the compression; the change will take effect with the next database update.
Default: no
Download an additional 3rd party signature database distributed through the ClamAV mirrors. This option can be used multiple times.
Default: disabled
Exclude a standard signature database (opt-out). This option can be used multiple times.
Default: disabled
With this option you can provide custom sources for database files. This option can be used multiple times. Support for:
http(s)://, ftp(s)://, or file:// Example usage:
Default: disabled
Use given proxy server and TCP port for database downloads. The HTTPProxyServer may be prefixed with [scheme]:// to specify which kind of proxy is used.
http:// HTTP Proxy. Default when no scheme or proxy type is specified.
https:// HTTPS Proxy. (Added in 7.52.0 for OpenSSL, GnuTLS and NSS)
socks4:// SOCKS4 Proxy.
socks4a:// SOCKS4a Proxy. Proxy resolves URL hostname.
socks5:// SOCKS5 Proxy.
socks5h:// SOCKS5 Proxy. Proxy resolves URL hostname.
Proxy usage is authenticated through given username and password.
Default: disabled
If your servers are behind a firewall/proxy which applies User-Agent filtering, you can use this option to force the use of a different User-Agent header. As of ClamAV 0.103.3, this setting may not be used when updating from the CDN and can only be used when updating from a private mirror.
Default: clamav/version_number
Notify a running clamd(8) to reload its database after a download has occurred. The path for clamd.conf file must be provided.
Default: The default is to not notify clamd. See clamd.conf(5)'s option SelfCheck for how clamd(8) handles database updates in this case.
Execute this command after the database has been successfully updated.
Default: disabled
Execute this command after a database update has failed.
Default: disabled
Execute this command when freshclam reports outdated version. In the command string %v will be replaced by the new version number.
Default: disabled
Use IP as client address for downloading databases. Useful for multi homed systems.
Default: Use OS'es default outgoing IP address.
Timeout in seconds when connecting to database server.
Default: 10
Maximum time in seconds for each download operation. 0 means no timeout.
Default: 0
This option enables downloading of bytecode.cvd, which includes additional detection mechanisms and improvements to the ClamAV engine.
Default: yes




Thomas Lamy <>, Tomasz Kojm <>, Kevin Lin <>


freshclam(1), clamd.conf(5), clamd(8), clamscan(1)

December 4, 2013 ClamAV 1.0.1