Category Archives: System Admin

PostgreSQL connections

If you are using an application that needs PostgreSQL connections on your LAN, don’t forget to add, or replace, in file postgresql.conf – listen_addresses =’*’ Otherwise, postgres will bind only to ‘localhost’ and won’t be accessible from your network. You … Continue reading

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Controlling backscatter spam in Mailman

By default, Mailman — which is installed by default in Virtualmin as your mailing list manager, exhibits some nasty behavior, being open to sending “backscatter” spam.  This means that the Bad Guys send fraudulent messages “from” the email address they … Continue reading

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Setting up Zonet 2102 print server on Ubuntu Linux

For setup of the Zonet ZPS2102: The default IP is 192.168.0.10 … in the Add Printer dialogs, choose Network Printer, then enter the IP address, the queue (default is: LP1) and choose the model. The Device URI, when you are … Continue reading

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Commands on selected files in a tree

For example, I needed to add the group execute (list directory) bit to every subdirectory in the tree below the currrent directory. Most of the simple ways get tripped up by filename quoting, or embedded spaces in directory names. Here’s … Continue reading

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Share Thunderbird Address book via LDAP

If you like this, please consider donating to fund further development. After years of frustration waiting for the Mozilla Thunderbird folks to add the ability to edit LDAP address-books, and years of frustration with the pigheadedness and brain-damagedness of LDAP … Continue reading

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Mailman membership reminder

Here’s a little script you can add to your crontab, to periodically email the administrators of each mailman mailing list both the list of current members and the mailing-list’s full configuration. This gives you both an audit trail of membership … Continue reading

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Subversion 1.6.5 on Ubuntu 9.04

Following the instructions at: https://launchpad.net/~anders-kaseorg/+archive/subversion-1.6 Edit the apt sources, using your favorite editor: $ sudo emacs /etc/apt/sources.list Add these lines to the end of the file: deb http://ppa.launchpad.net/anders-kaseorg/subversion-1.6/ubuntu jaunty main deb-src http://ppa.launchpad.net/anders-kaseorg/subversion-1.6/ubuntu jaunty main The add the key signature: $ … Continue reading

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Reducing Spamassassin process count

Dramatically reduce memory footprint by changing the number of threads that spamassassin will execute at once from 5 down to 1. Centos: In /etc/sysconfig/spamassassin – change: SPAMDOPTIONS=”-d -c -m5 -H” to SPAMDOPTIONS=”-d -c -m1 -H” Debian: in /etc/default/spamassassin, change: OPTIONS=”–create-prefs … Continue reading

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APC UPS in Centos 5.x

$ sudo yum install apcups* … —> Package apcupsd.x86_64 0:3.14.3-1.el5.rf set to be updated … $ sudo /sbin/chkconfig –list apcupsd apcupsd 0:off 1:off 2:on 3:on 4:on 5:on 6:off Before you start the apcupsd service, edit /etc/apcupsd/apcupsd.conf and set the cable … Continue reading

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Mounting LVM volumes from Ubuntu LiveCD

sudo -i apt-get install lvm2 modprobe dm-mod vgchange -a y Also try – pvdisplay Displays physical volumes vgdisplay Displays volume groups lvdisplay Displays logical volumes and: man lvm

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