vzdump rpm
In some of my projects I use OpenVZ to create containers. One of the tools I use to create backup of running container is vzdump from proxmox.com. Unfortunately rpm provided is older version and latest provided only as debian package. …
Oracle VirtualBox shared clipboard
Oracle VM VirtualBox is a virtualization software package. It is really useful to run several OS simultaneously. And great educational tool. One useful feature not enabled by default is possibility to copy/paste between host and guest (also called shared clipboard). …
C (programming language) cheatsheet added
Recently I’ve decided that even some people think that C programming language is old and obsolete it still worth be be learned. While learning I’ve frequently consulted information about different commands. As consequence I’ve created small C cheat sheet that …
Password strength – Comic
Source: xkcd
Using screen as default shell
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 …
Shorewall YUM repository
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 …
How to list installed packages in Debian or Ubuntu
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: …
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Mirror of CentALT repository (CentOS 5)
(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 …
IPv4 CIDR cheatsheet added
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.
Hello world!
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.