FRESHCLAM.CONF(5) - Linux man page online | File formats

Configuration file for Clam AntiVirus database update tool.

December 4, 2013
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: BOOL Boolean value (yes/no or true/false or 1/0). STRING String without blank characters. SIZE Size in bytes. You can use 'M' or 'm' modifiers for megabytes and 'K' or 'k' for kilobytes. NUMBER Unsigned integer.


When an option is not used (hashed or doesn't exist in the configuration file) freshclam takes a default action. Example If this option is set freshclam will not run. LogFileMaxSize SIZE 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 LogTime BOOL Log time with each message. Default: no LogSyslog BOOL Enable logging to Syslog. May be used in combination with UpdateLogFile. Default: disabled. LogFacility STRING Specify the type of syslog messages - please refer to 'man syslog' for facility names. Default: LOG_LOCAL6 LogVerbose BOOL Enable verbose logging. Default: disabled LogRotate BOOL Rotate log file. Requires LogFileMaxSize option set prior to this option. Default: no PidFile STRING This option allows you to save the process identifier of the daemon to a file spec‐ ified in the argument. Default: disabled DatabaseDirectory STRING Path to a directory containing database files. Default: /var/lib/clamav Foreground BOOL Don't fork into background. Default: no Debug BOOL Enable debug messages in libclamav. Default: no UpdateLogFile STRING Enable logging to a specified file. Highly recommended. Default: disabled. DatabaseOwner STRING When started by root, drop privileges to a specified user. Default: Checks NUMBER Number of database checks per day. Default: 12 DNSDatabaseInfo STRING 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 STRING 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. Default: PrivateMirror STR This option allows you to easily point freshclam to private mirrors. If PrivateMir‐ ror is set, freshclam does not attempt to use DNS to determine whether its data‐ bases 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, fresh‐ clam first attempts to download the CLD file. If that fails, it tries to download the CVD file. This option overrides DatabaseMirror, DNSDatabaseInfo and ScriptedUp‐ dates. It can be used multiple times to provide fall-back mirrors. Default: disabled MaxAttempts NUMBER How many attempts (per mirror) to make before giving up. Default: 3 (per mirror) ScriptedUpdates BOOL With this option you can control scripted updates. It's highly recommended to keep it enabled. Default: yes TestDatabases BOOL 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 CompressLocalDatabase BOOL 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 ExtraDatabase STRING Download an additional 3rd party signature database distributed through the ClamAV mirrors. This option can be used multiple times. Default: disabled ExcludeDatabase STRING Exclude a standard signature database (opt-out). This option can be used multiple times. Default: disabled DatabaseCustomURL STRING 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: DatabaseCustomURL Default: disabled HTTPProxyServer STR, HTTPProxyPort NUMBER 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. HTTPProxyUsername STR,HTTPProxyPassword STRING Proxy usage is authenticated through given username and password. Default: disabled HTTPUserAgent STRING 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. Default: clamav/version_number NotifyClamd STRING 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. OnUpdateExecute STRING Execute this command after the database has been successfully updated. Default: disabled OnErrorExecute STRING Execute this command after a database update has failed. Default: disabled OnOutdatedExecute STRING Execute this command when freshclam reports outdated version. In the command string %v will be replaced by the new version number. Default: disabled LocalIPAddress IP Use IP as client address for downloading databases. Useful for multi homed systems. Default: Use OS'es default outgoing IP address. ConnectTimeout NUMBER Timeout in seconds when connecting to database server. Default: 10 ReceiveTimeout NUMBER Timeout in seconds when reading from database server. 0 means no timeout. Default: 0 SafeBrowsing BOOL This option enables support for Google Safe Browsing. When activated for the first time, freshclam will download a new database file (safebrowsing.cvd) which will be automatically loaded by clamd and clamscan during the next reload, provided that the heuristic phishing detection is turned on. This database includes information about websites that may be phishing sites or possible sources of malware. When using this option, it's mandatory to run freshclam at least every 30 minutes. Freshclam uses the ClamAV's mirror infrastructure to distribute the database and its updates but all the contents are provided under Google's terms of use. See and‐ ments/safebrowsing for more information. Default: no Bytecode BOOL This option enables downloading of bytecode.cvd, which includes additional detec‐ tion mechanisms and improvements to the ClamAV engine. Default: yes




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


freshclam(1), clamd.conf(5), clamd(8), clamscan(1)
ClamAV 0.102.3 December 4, 2013 freshclam.conf(5)
This manual Reference Other manuals
freshclam.conf(5) referred by clamconf(1) | clamd(8) | clamd.conf(5) | clamscan(1) | freshclam(1) | sigtool(1)
refer to clamd(8) | clamd.conf(5) | clamscan(1) | freshclam(1)
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Index Clam AntiVirus (+13) ClamAV 0.102.3 (+13) № 5 (+2141)
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