Author: hb

GNU Screen is excellent sysadmin tool and can make your life much easier. If working on remote ssh shell and connection is interrupted (usually at worst time) I often wish that I’ve started screen in advance. Other useful way of …

Using screen as default shell Read More »

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Shorewal or Shoreline Firewall is is high-level tool for configuring Netfilter. Even RPM packages are available from long time on most YUM repositories only older versions could be found. That is the reason I’ve decided to create this repository. What …

Shorewall YUM repository Read More »

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If you want to see what packages are installed in Debian or Ubuntu system use following commands: To list all the package installed: dpkg-query -l This will return something similar to this: dpkg-query -l Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: …

How to list installed packages in Debian or Ubuntu Read More »

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(Translated from CentALT web site Site offline) Introduction Quite a few system administrators use RHEL 5 or one of multiple clones CentOS or Scientific Linux. With this repository you will be able fairly easy to install on RHEL/CentOS 5 latest …

Mirror of CentALT repository (CentOS 5) Read More »

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When you have multiple CIDR subnets in your network subnet mask is often different. To be certain about correct netmask I’m using CIDR cheat sheet. You can find it at IPv4 CIDR page. Note: CIDR is classless inter domain routing.

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Welcome to Sysadmin Guide. This is the first post here. On this site you will find tutorials related to sysadmin work, but also informational technology (IT) in general. Stay tuned.

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