If you get the error message “connect to mysql server 127.0.0.1: Too many connections” in a log file, e.g. the mail.log file, then the max. number of mysql database connections on your server is reached. To increase the max. number of simultanious connections, edit the MySQL my.cnf file:

vi /etc/mysql/my.cnf

[mysqld]
……
max_connections = 500
max_user_connections = 500
…….

If you get the error “/dev/zero: No space left on device” in the apache error.log on a OpenVZ virtual machine, then the shared memory size in the xcache.ini is too high or the xcache.mm_path is set wrong.

Edit the file /etc/php5/conf.d/xcache.ini

vi /etc/php5/conf.d/xcache.ini

xcache.mmap_path = "/tmp/xcache"

/etc/init.d/apache2 restart

If the roor still occurs after some time, you will have to reduce the xcache.size.

Edite the xcache.ini file:

vi /etc/php5/conf.d/xcache.ini

xcache.size  =                8M

/etc/init.d/apache2 restart

If you use a mailserver wil very low ram (< 500 MB) and a slow CPU then it might be nescessary to disable the spam- and antivirus filter functions in ISPConfig 3 as amavisd and clamav might be too heavy for your server hardware. The steps to disable clamav and amavisd are:

Edit postfix main.cf file

vi /etc/postfix/main.cf

# content_filter = amavis:[127.0.0.1]:10024
# receive_override_options = no_address_mappings

/etc/init.d/postfix restart

/etc/init.d/clamav-daemon stop
/etc/init.d/clamav-freshclam stop
/etc/init.d/amavis stop

update-rc.d -f clamav-daemon remove
update-rc.d -f clamav-freshclam remove
update-rc.d -f amavis remove

The changes in postfix main.cf will get overwitten by a ispconfig software update when you select to reconfigure services during upadte, so you should comment out the lines again after you install a ispconfig update.

The pure-ftpd package that comes with Debian 5.0 (Lenny) does not start in a OpenVZ virtual machine as it is compiled with “capabilities”. This tutorial describes the steps to build a pure-ftpd Debian package with capabilities disabled:

Make a temporary directory

mkdir /usr/src/pure-ftpd
cd /usr/src/pure-ftpd

apt-get source pure-ftpd
apt-get build-dep pure-ftpd

cd pure-ftpd-1.0.21/debian
nano rules

optflags=--with-everything --with-largefile --with-pam --with-privsep --with-tls

optflags=--with-everything --with-largefile --with-pam --with-privsep --with-tls --without-capabilities

cd ..
dpkg-buildpackage -uc -b

cd ..
dpkg -i pure-ftpd-common_1.0.21-11.4_all.deb pure-ftpd-mysql_1.0.21-11.4_i386.deb
/etc/init.d/pure-ftpd-mysql restart

echo 'pure-ftpd-common hold' | dpkg --set-selections
echo 'pure-ftpd-mysql hold' | dpkg --set-selections

The spamassassin installation on a ISPConfig 2 server is normally updated together with ISPConfig. Here are the steps iIf you want to update spamassassin manually without updating ISPConfig 2:

Download the latest Spamassassin sources and unpack the tar.gz file

cd /tmp
wget http://ftp.fernuni-hagen.de/ftp-dir/pub/mirrors/\
www.apache.org/spamassassin/source/Mail-SpamAssassin-3.3.1.tar.gz
tar xfz Mail-SpamAssassin-3.3.1.tar.gz

cd Mail-SpamAssassin-3.3.1
perl Makefile.PL PREFIX=/home/admispconfig/ispconfig/tools/\
spamassassin/usr SYSCONFDIR=/home/admispconfig/ispconfig/\
tools/spamassassin/etc
make
make install

cd ..
rm -f Mail-SpamAssassin-3.3.1.tar.gz
rm -rf Mail-SpamAssassin-3.3.1

Some internet access providers have port 25 disabled in their routers to prevent spam. If you run your own mailserver in a datacenter, you might have to enable the submission port (587) in postfix to be able to send emails from your local email client to your own mailserver.

To enable port 587, edit the file /etc/postfix/master.cf

vi /etc/postfix/master.cf

#submission inet n      -       n       -       -       smtpd

submission inet n      -       n       -       -       smtpd

/etc/init.d/postfix restart

With Saidar you can display and view all your system statistics.

For an installation in Ubuntu or Debian you can install this with following command:

sudo apt-get install saidar

saidar

The following options are supported:

-d    (Wait DELAY seconds between updates (default 3))

-v   (Prints the version number)

-h   (Display help and exits)

That’s it! Thanks to Planetfox for this tipp.

As of today, all ClamAV 0.94 or older installs will stop working. The Debian project has not released updates for their current stable release (5.0) yet to solve this, but there is a workaround. The Debain volatile project provides newer clamav versions. The installation steps to install ClamAV 0.95.3 on Debian lenny are:

1) Add the debian volatile repository to the sources list:

echo "deb http://volatile.debian.org/debian-volatile lenny/volatile main contrib non-free" >> /etc/apt/sources.list

apt-get update
apt-get install clamav
apt-get -u upgrade

/etc/init.d/amavis restart

Have you ever searched where the virtual host of a website is defined in the apache config files? There is a handy option of the apache2ctl script which might help then. When you run the command:

apache2ctl -S

~# apache2ctl -S
VirtualHost configuration:
wildcard NameVirtualHosts and _default_ servers:
*:8080                 is a NameVirtualHost
default server ispconfig.local (/etc/apache2/sites-enabled/000-ispconfig.vhost:10)
port 8080 namevhost ispconfig.local (/etc/apache2/sites-enabled/000-ispconfig.vhost:10)
*:8081                 is a NameVirtualHost
default server ispconfig.local (/etc/apache2/sites-enabled/000-apps.vhost:10)
port 8081 namevhost ispconfig.local (/etc/apache2/sites-enabled/000-apps.vhost:10)
*:80                   is a NameVirtualHost
default server ispconfig.local (/etc/apache2/sites-enabled/000-default:1)
port 80 namevhost ispconfig.local (/etc/apache2/sites-enabled/000-default:1)
port 80 namevhost example.com (/etc/apache2/sites-enabled/example.com.vhost:7)
Syntax OK

Maybe you had this problem already: you use Debian or Ubuntu Linux and a software package that you like to install is only available in RPM format. The solution is a handy tool called alien, which converts .rpm files to .deb.  Installing alien:

apt-get install alien

Converting a rpm package to debian format:

alien --to-deb /tmp/mysoftwarefile.rpm

Conversions from .deb to rpm are also possible:

alien --to-rpm /tmp/mysoftwarefile.deb