DB Variables Configuration

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Database variables

  Note:
See following wiki pages for the syntax of access to the configuration database entries from the command line Access from the Command Line and a db command tutorial


SME Server comes with the most used parameters set as variables in its internal configuration databases. These variables are used to store values to be used in the final configuration files. Please, read the SME_Server:Documentation:Developers_Manual:Section2 to understand the template and database process.

These variables are useful to configure your system more easily, as you do not need to modify configuration files directly for most common cases. It also makes it possible to administer the server through its server-manager as the database variables are used to set and change configuration parameters. After editing, the configuration files must be regenerated and affected services need to be restarted.

For example, suppose you need to increase "memory-limit" in php.

You would simply execute these commands at the server console: 

db configuration setprop php MemoryLimit 64M
expand-template /etc/php.ini
/etc/init.d/httpd-e-smith restart

The first line changes the value for the memory limit of PHP, the second line regenerates the configuration file and the last line will reload Apache (and subsequently also PHP as this is configured as a module of Apache).


  Warning:
Database parameters are case sensitive so take great care when typing at the server shell because no error messages are given should you make a typo.


The database system is based on a flat file system, but you should never edit them directly. Instead you should use the db command. More details on using the database system can be found in the SME Server Developer's Guide.


Setting db variables to default values

  Note:
Use of 'config' is a shorthand version for 'db configuration' and therefore only works with the configuration database


Any db variable that has a default value can be reset to the default by deleting the variable entirely, then re-initializing the default database values as follows: 

config delprop <key> <prop>
/etc/e-smith/events/actions/initialize-default-databases

Delete a property value

To delete the property 

db accounts delprop <key> <prop>

Reset a property value

To reset to an empty value 

db accounts setprop <key> <prop> ''


  Warning:
Database parameters are case sensitive so take great care when typing at the server shell because no error messages are given should you make a mistake.


Concept of the signal-event command

Due to the efforts of the developers, you can further simplify the commands using the signal-event proccess.

For full details see SME_Server:Documentation:Developers_Manual:Section2

Overview of database variables

The next section describes the standard variables defined on SME Server. Please update this list with new standard variables in future SME Server versions.

The tables below have three columns. The first is the variable, the second is the target variable (located in the final configuration file), and the third is the default value.

A lot of the variables can be set using the server-manager but some can not. For example the variable DomainMaster for samba is not important here, because this can be set through server-manager. On the other hand, the variable RecycleBin is important, because it is not accessible through the server-manager.

Configuration files may use database values from a single configuration key, or may use multiple keys. The latter is the case for the /etc/rc.d/init.d/masq configuration file. This file takes it values from multiple database keys such as squid and masq.

It is also possible that multiple configuration files use the same key. An example of this is the httpd-admin key. This key has a variable TCPPort which is used in multiple files (/etc/httpd/admin-conf/httpd.conf and /etc/services).


AppleTalk (atalk)

Usage 

db configuration setprop atalk variable value
signal-event workgroup-update
Affected file: /etc/atalk/netatalk.conf
Variable Target Default
MaxClients AFPD_MAX_CLIENTS 20


Backup

Usage 

db configuration setprop backup variable value
signal-event conf-backup
Affected file: /etc/e-smith/events/post-backup/S90eject-tape
Variable Target Default
Device $device /dev/st0
Eject Logical operation no


Console Mode

Usage - Choose either login or auto DB variable. 

config set ConsoleMode login
signal-event post-upgrade
signal-event reboot
Variable Target Default
ConsoleMode Console Setting login


Clam AntiVirus (clamav)

Usage 

db configuration setprop clamav variable value
signal-event clamav-update
Affected file: /etc/clamd.conf
Variable Target Default
ArchiveBlockEncrypted ArchiveBlockEncrypted no
ArchiveBlockMax ArchiveBlockMax no
ArchiveMaxCompressionRatio ArchiveMaxCompressionRatio 300
ArchiveMaxFiles ArchiveMaxFiles 1500
ArchiveMaxFileSize ArchiveMaxFileSize 15M
ArchiveMaxRecursion ArchiveMaxRecursion 8
Debug Debug no
DetectBrokenExecutables DetectBrokenExecutables no
FilesystemScanExclude FilesystemScanExclude /proc,/sys,/usr/share,/var
IdleTimeout IdleTimeout 60
LeaveTemporaryFiles LeaveTemporaryFiles no
LogClean LogClean yes
LogTime LogTime yes
LogVerbose LogVerbose yes
MaxConnectionQueueLength MaxConnectionQueueLength 30
MaxDirectoryRecursion MaxDirectoryRecursion 20
MaxThreads MaxThreads 20
ReadTimeout ReadTimeout 300
ScanArchive ScanArchive yes
ScanHTML ScanHTML yes
ScanMail ScanMail yes
ScanOLE2 ScanOLE2 yes
ScanPE ScanPE yes
SelfCheck SelfCheck 1800
StreamMaxLength StreamMaxLength 25M


Affected file: /etc/freshclam.conf
Variable Target Default
Checks Checks 24
DatabaseMirror DatabaseMirror db.local.clamav.net
DNSDatabaseInfo DNSDatabaseInfo current.cvd.clamav.net
LogVerbose LogVerbose yes
MaxAttempts MaxAttempts 6


Affected file: /var/service/clamd/env/MEMLIMIT
Variable Target Default
MemLimit MEMLIMIT 600000000

DHCP daemon (dhcpd)

Usage 

db configuration setprop dhcpd variable value
signal-event remoteaccess-update
Affected file: /etc/dhcpd.conf
Variable Target Default
Bootp bootp deny
startDynamicIPRange range
endDynamicIPRange range

Note: the end of the dynamic IP range will be set to the value of 'endDynamicIPRange' minus the value of pptpd:sessions.

DNS Cache Forwarder (dnscache.forwarder)

Usage 

db configuration setprop dnscache variable value
signal-event dns-update
Affected file: /var/service/dnscache.forwarder/config
Variable Target Default
CacheSize CACHESIZE 1000000
DataLimit DATALIMIT 3000000


FlexBackup

Usage 

db configuration setprop flexbackup variable value
signal-event conf-backup
Affected file: /etc/flexbackup.conf
Variable Target Default
Blocksize $blksize 32
TapeBlocksize $mt_blksize 0
BufferProg $buffer buffer
BufferMegs $buffer_megs 20
erase_rewind_only $erase_rewind_only false
Type $type tar


Horde (webmail)

Usage 

db configuration setprop horde variable value

expand-template /home/httpd/html/horde/conf.menu.apps.php
Affected file: /home/httpd/html/horde/conf.menu.aps.php
Variable Target Default
MenuArray MenuArray enabled 


expand-template /home/httpd/html/horde/config/conf.php
Affected file: /home/httpd/html/horde/config/conf.php
Variable Target Default
Administration Administration disabled 
expand-template /etc/e-smith/templates/home/httpd/html/horde/config/prefs.php/200personal
Affected file: /etc/e-smith/templates/home/httpd/html/horde/config/prefs.php/200personal
Variable Target Default
Name 'My Company' 'Horde Webmail' 


expand-template /home/httpd/html/horde/turba/config/sources.php
Affected file: /home/httpd/html/horde/turba/config/sources.php
Variable Target Default
freebusy freebusy disabled
SharedAddressBooks SharedAddressBooks disabled

Apache server ibay specific (httpd-e-smith)

Usage 

db accounts setprop ibayname variable value
signal-event ibay-modify ibayname
Affected file: /etc/httpd/conf/httpd.conf
Variable Target Default
AllowOverride AllowOverride None
FollowSymLinks FollowSymLinks disabled
Indexes Indexes enabled
PHPRegisterGlobals register_globals disabled
PHPBaseDir open_basedir /home/e-smith/files/ibays/ibayname
SSLv2 SSLProtocol disabled

Apache server-manager (httpd-admin)

Usage 

db configuration setprop httpd-admin variable value
signal-event remoteaccess-update
Affected file: /etc/httpd/admin-conf/httpd.conf and /etc/services
Variable Target Default
TCPPort TCPPort 980


IMAP (imap)

Usage 

db configuration setprop imap variable value
signal-event email-update
Affected file: /var/service/imap/config
Variable Target Default
ConcurrencyLimit INSTANCES 2000
ConcurrencyLimitPerIP INSTANCES_PER_IP 12
ProcessMemoryLimit ulimitdata 128000000


  Tip:
The notes on the concurrency limits noted under IMAPS also apply here. See below.


IMAPS (imaps)

Usage 

db configuration setprop imaps variable value
signal-event email-update
Affected file: /var/service/imaps/config
Variable Target Default
ConcurrencyLimit INSTANCES 2000
ConcurrencyLimitPerIP INSTANCES_PER_IP 12
ProcessMemoryLimit ulimitdata 128000000


  Tip:
You can see if you are running out of the number of available connections in your log file /var/log/imaps/current and look for messages like the log extract below where the ConcurrencyLimitPerIP was set to 20. A 21st connection was attempted and was denied. 
tcpsvd: info: pid 30693 from 10.1.0.104
tcpsvd: info: concurrency 30693 10.1.0.104 21/20
tcpsvd: info: deny 30693 0:10.1.0.21 ::10.1.0.104:49332 ./peers/10.1.0


  Tip:
Mobile devices have a tendency to frequently disconnect and connect from the network. When this disconnect happens, the sessions on the server are not always immediately cleaned up (they get cleaned up after a time out of some minutes). When the email client reconnects, they create new network connections and you get into the situation that these new connections get denied because of the concurrency limit. On the mobile device this may be noted as a "Unable to connect to server" message.


  Tip:
Some email clients use a separate connection per imap folder, so the concurrency limits may occur for users that have many imap folders.


IPTables firewall (masq)

Usage 

db configuration setprop masq variable value
signal-event remoteaccess-update
Affected file: /etc/rc.d/init.d/masq
Variable Target Default
Logging Logging most
Stealth Stealth no


  Tip:
Special case is TCPPort and UDPPort from any DB key.

Any Db key named "TCPPort" or "UDPPort" affect masq file.

Currently the following keys are included in masq:

TCPPort:

httpd-admin - sshd - smtpd - ssmtpd



Additional information on customizing iptables

Create a custom-named service definition in the configuration database. 

db configuration set <servicename> service

Apply your desired firewall restrictions to any existing SME 'service' or to a custom-named service that you have created. Combine a custom-named service with port-forwarding to create customized firewall rules. 

db configuration setprop <servicename> TCPPort <portnumber>
db configuration setprop <servicename> TCPPorts <portnumbers>
db configuration setprop <servicename> UDPPort <portnumber>
db configuration setprop <servicename> UDPPorts <portnumbers>
db configuration setprop <servicename> status enabled|disabled
db configuration setprop <servicename> access public|private
db configuration setprop <servicename> AllowHosts a.b.c.d,x.y.z.0/24
db configuration setprop <servicename> DenyHosts e.f.g.h,l.m.n.0/24

Effectuate the changes you have made 

signal-event remoteaccess-update


Affected file: /etc/rc.d/init.d/masq
Variable Target Default
TCPPort --proto tcp --dport <Ports> Pre-configured for default services; no default for custom services
TCPPorts --proto tcp --dports <Ports> No default for custom services; Ranges of ports are defined with a : not a -
UDPPort --proto udp --dport <Ports> Pre-configured for default services; no default for custom services
UDPPorts --proto udp --dports <Ports> No default for custom services; Ranges of ports are defined with a : not a -
status disabled AllowHosts is set to "" (an empty string) unless the status is 'enabled'
access private AllowHosts is set to "" (an empty string) unless access is 'public'
AllowHosts --src ..... --jump ACCEPT Pre-configured for default services; no default for custom services. Default is '0.0.0.0/0' if service is enabled and public.
DenyHosts --src ..... --jump denylog Pre-configured for default services; no default for custom services. If 'DenyHosts' is empty or does not exist then there are no '... --jump denylog' entries created in /etc/init.d/masq.

SpamAssasin

Usage 

db configuration setprop spamassassin variable value
signal-event email-update
Affected file: /etc/mail/spamassassin/local.cf
Variable Target Default
DNSAvailable dns_available yes
OkLanguages ok_languages all
OkLocales ok_locales all
ReportSafe report_safe 0
Subject rewrite_header Subject [SPAM]
SkipRBLChecks skip_rbl_checks 0
TrustedNetworks trusted_networks 127.
UseAutoWhitelist use_auto_whitelist 0
UseBayes use_bayes 0
Sensitivity required_hits medium

Sometimes certain spamassassin update servers get corrupted or are not updated frequently. The list is available at: /var/lib/spamassassin/3.003001/updates_spamassassin_org/MIRRORED.BY

MySQL (mysqld)

Usage 

db configuration setprop mysqld variable value
expand-template /etc/my.cnf
sv t /service/mysqld
Affected file: /etc/my.cnf
Variable Target Default
InnoDB InnoDB disabled
LocalNetworkingOnly LocalNetworkingOnly yes

Network Time Protocol (ntpd)

Usage 

db configuration setprop ntpd variable value
signal-event timeserver-update
Affected file: /var/service/ntpd/env/MEMLIMIT
Variable Target Default
MemLimit MEMLIMIT 35000000
Affected file: /etc/ntp/step-tickers and /etc/ntp.conf
Variable Target Default
NTPServer server pool.ntp.org
SyncToHWClockSupported SyncToHWClockSupported yes
SupportLargeDrift

A new db key for ntpd: SupportLargeDrift. Default value is disabled, which doesn't change the current behaviour. bugzilla: 7979

If set to enabled, it will - add tinker panic 0 at the begening of the ntp.conf - remove the lines 

server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10

With SupportLargeDrift enabled, the guest is able to resync the clock with the configured ntp server, even after resuming from a suspended state (tested with a ~10min drift, it took about 3 or 4 minutes for the guest to resync the clock after resuming). 

db configuration setprop ntpd SupportLargeDrift enabled

Php

Usage 

db configuration setprop php variable value
expand-template /etc/php.ini
/etc/init.d/httpd-e-smith restart
Affected file: /etc/php.ini
Variable Target Default
MaxExecutionTime max_execution_time 30
MemoryLimit memory_limit 32M
PostMaxSize post_max_size 20M
UploadMaxFilesize upload_max_filesize 10M
AllowUrlFopen allow_url_fopen Off

Don't forget "M" unit because you get a lot of httpd errors and apache can't start!


Virtual Private Network (VPN) (pptpd)

Usage 

db configuration setprop pptpd variable value
signal-event remoteaccess-update
Affected file: /etc/ppp/options.pptpd
Variable Target Default
debug debug no
mtu mtu not set by default, add your value (1404) after mtu
mru mru not set by default, add your value (1404) after mru

-

Passive passive enabled


Affected file: /etc/pptpd.conf
Variable Target Default
debug debug no


Pro FTP (proftpd)

Usage 

db configuration setprop ftp variable value
signal-event remoteaccess-update
Affected file: /etc/proftpd.conf
Variable Target Default
DisableAnonymous DisableAnonymous no


Samba global settings (smbd)

Usage 

db configuration setprop smb variable value
signal-event ibay-modify
Affected file: /etc/samba/smb.conf
Variable Target Default
RecycleBin recycle disabled
ShadowCopy shadow_copy disabled
DeadTime deadtime 10080
DisplayCharSet display charset ISO8859-1
DosCharSet dos charset 850
LogonDrive logon drive Z
OpLocks oplocks enabled
OsLevel os level 65
ServerString server string SME Server
SMBPorts smb ports 139
UnixCharSet unix charset UTF8
UseClientDriver use client driver yes

Samba per i-bay settings (smbd)

Usage 

db accounts setprop ibay_name variable value
signal-event ibay-modify
Affected file: /etc/samba/smb.conf
Variable Target Default
Browseable browseable enabled
OpLocks oplocks enabled
RecycleBin recycle disabled
VetoOplockFiles veto oplock files (not set)

Squid Proxy (squid)

Usage 

db configuration setprop squid variable value
signal-event proxy-update
Affected file: /etc/squid/squid.conf
Variable Target Default
SafePorts acl Safe_ports port 80
EnforceSafePorts EnforceSafePorts no


Affected file: /etc/squid/squid.conf and /etc/rc.d/init.d/masq
Variable Target Default
Transparent Transparent yes


Affected file: /etc/rc.d/init.d/masq
Variable Target Default
TransparentPort TransparentPort 3128


Alternate Usage for Configuration of an Up-Stream Proxy Server 

db configuration set squid-parent-variable value
signal-event proxy-update
Affected file: /etc/squid/squid.conf
squid-parent-variable Target Default
SquidParent name-or-ip-of-upstream-proxy-server (none)
SquidParentPort port-number-used-by-upstream-proxy-server (none)

(un-do using 'db configuration delete SquidParent', 'signal-event proxy-update')


SSH (sshd)

Usage 

db configuration setprop sshd variable value
signal-event remoteaccess-update
Affected file: /etc/ssh/sshd_config
Variable Target Default
TCPPort Port 22
Protocol Protocol 2
UsePAM UsePAM no
MaxAuthTries MaxAuthTries 2
MaxStartups MaxStartups 10:30:60
PasswordAuthentication PasswordAuthentication no
PermitRootLogin PermitRootLogin no
AllowHosts AllowHosts IP address(es) list


  Note:
Currently in SME 7.2 and up, TCPPort is configurable via server-manager, under Remote Access menu.

To configure AllowHosts: IP address(es) list is a single IP or a comma separated list of IP addresses and/or netmasks (e.g. 16.17.18.19,203.14.64.0/24). Ssh will then only be allowed from those IP addresses. The firewall code will drop ssh connections from any other hosts.



smtpd

Usage 

config setprop smtpd variable value
signal-event email-update
Affected file: /var/service/qpsmtpd/runenv
Variable Target Default
Instances Total smtp Instances 40
InstancesPerIP smtp-Instances-Per-IP 5
Affected file: /var/service/qpsmtpd/config/smtpgreeting
Variable Target Default
Greeting Hostname portion of the greeting provided by your server to inbound SMTP connections $SystemName.$DomainName
Affected file: /var/qmail/control/helohost
Variable Target Default
HeloHost SMTP Helo / Ehlo value provided by your server when connecting to external SMTP servers to send email $DomainName

yum

Usage 

config setprop yum variable value
signal-event yum-modify
Affected file: /etc/yum.conf
Variable Target Default
AutoInstallUpdates Install updates automatically? disabled
check4updates Frequency of Update Checking see here daily
EnableGroups Enable Groups 0
GPGCheck Check GPG signature for repositories 0
PackageFunctions Display individual packages in 'Software Installer' disabled
RandomDelay Random Delay 120
status Yum's status enabled
RestrictRepo Repo names whose contents should be excluded from 'Available Packages' in the 'Software Installer' none
RestrictRPM All or part of an RPM name to be excluded from 'Available Packages' in the 'Software Installer' none

See also 'db yum_repositories'

Miscellaneous Other DB Variables

  Note:
This is meant to be an easy place to add db variable information if you don't have time to put it into the correct section(s) above. You can find most of the template fragments affected by a given db variable if you execute: 
cd /etc/e-smith
fgrep -lR variable templ*/* | less

where variable is the name of the variable using correct capitalization

Note that any command listed here is to be executed on one line!



Command service(s) config file(s) notes
db domains setprop test.com MailServer a.b.c.d
or use FQDN in place of a.b.c.d
eg db domains setprop test.com MailServer aspmx.l.google.com 		qpsmtpd; qmail; fetchmail /var/service/qpsmtpd/config/goodrcptto

/var/service/qpsmtpd/config/peers/local

/var/service/qpsmtpd/config/peers/

/var/service/qpsmtpd/plugins

/var/service/qmail/control/virtualdomains

/var/service/qmail/control/smtproutes

/etc/fetchmail

Forward all email for the specified domain to the IP address a.b.c.d. a.b.c.d can be either local or remote. By default, the recipient address will be verified as valid on a.b.c.d before SME accepts the inbound message.
config set SquidParent <hostname or IP> squid, diald /etc/diald.filter, /etc/squid/squid.conf Configure squid to peform all web downloads from the specified upstream proxy server
config set SquidParentPort <portnumber> squid /etc/squid/squid.conf Connect to the upstream proxy server using <portnumber>. Defaults to 3128 if 'SquidParentPort' is unspecified. Ignored if SquidParent is not set.
config delete SquidParent squid, diald /etc/squid/squid.conf, /etc/diald.filter Return squid to normal operation (no upstream proxy server)
db accounts setprop username Visible internal ; signal-event email-update n/a n/a Make an email address invisible from outside? (see http://forums.contribs.org/index.php?topic=36302.0)
db accounts setprop pseudonym Visible internal ; signal-event email-update n/a n/a Make an pseudonym email address invisible from outside
db <database> delprop key property ; /etc/e-smith/events/actions/initialize-default-databases various various Restore the developers' default value for property
db <database> delete key ; /etc/e-smith/events/actions/initialize-default-databases various various Restore the developers' default value for each property belonging to the key key
config set AdminIsNotRoot enabled n/a n/a In server-manager panel, changing admin password no more change root password. root password is managed through passwd shell command and admin and root passwords can be distinct passwords.
config setprop smtp-auth-proxy PeerPort xxx; signal-event email-update smtp-auth-proxy none - the smtp-auth-proxy executable (//usr/local/sbin/smtp-auth-proxy.pl) reads the config database directly. Used to change the port number used to connect to the upstream mail server ("SMTPSmartHost" or "Address of Internet provider's mail server"). Defaults to port 25 if PeerPort is not set; uses SSL if port 465 is selected.
db configuration setprop qpsmtpd tlsCipher XXX; signal-event email-update qpsmtpd /var/service/qpsmtpd/config/tls_ciphers By default qpsmtpd only accepts the stronger SSL 3.0 or TLS 1.0 protocols for securing SMTPS connections. If needed, one can set qpsmtpd to also allow the weaker SSL 2.0 protocol. For XXX one can use:

'ALL:!aNULL:!ADH:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM' (SSLv2/SSLv3/TLSv1)
'HIGH:!SSLv2' (=Default: only allow stronger SSLv3/TLSv1 protocols)

Note: don't forget to use the quotes!!
config setprop pppoe Mlimit <value> pppoe /service/wan/run.pppoe.conf notes. - <value> cannot be set below 100000000 - <value> can be set above 100000000.

If pppoe Mlimit is set to a value below the MIN_MEMORY_LIMIT, currently 100000000, this lower value will not be accepted and Mlimit will be set to the default value (100000000).

command service(s) config file(s) notes. Copy this block when adding new entries to this table.


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