Renan Rangel crunching technology for breakfast

5May/130

Debian Wheezy released this weekend!

Posted by Renan Rangel

DebianThe highly awaited stable release has reached the 7.0 version (code name "Wheezy"), brining some very interesting things along the way.

For the first time, Debian users will be able to install packages from both 32-bit and 64-bits architecture on the same systems with full dependency resolution. Also worth noting is that the installer supports software speech, making it easier to visually impaired people to install it.

Quite a few new packages I was interested in running in production have made into the release (tcptrack, finally!). The kernel was bumped to 3.2, although I will miss some of the late improvements. Notable upgrades include MySQL 5.5, PHP 5.4.4, Postgres 9.1, Samba 4 (unfortunately only the beta release) and Xen 4.1. For those out there used to Gnome 2.x, bad news: Gnome 3.x has made its way and there is no easy way to switch back to 2.x. I guess I will have to keep using Gnome 2 on Gentoo instead.

It seems that the wheezy-backports is not ready yet (or at least not visible on packages.debian.org). Sometimes it is the only way to get new versions from an official source without having to compile it yourself.

By the way, the codename for the testing release has become "Jessie".

So, prepare your test environments and lets start the upgrades 😀

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15Jan/120

Getting real-time information about TCP connections

Posted by Renan Rangel

Every sysadmin has a good set of tools that he works with. A nice addition to the Linux sysadmin that usually has to manage a gateway/firewall or other computers with a high number of connections is tcptrack.

tcptrack

It can show you the active TCP connections in real-time, sort them by speed, activity, etc, show how many connections currently exist and also their state. It is a simple tool but very informative - it can be very helpful when you need to find where traffic is coming from. As a bonus, it also supports tcpdump-like filters, so you can display only the connections you are looking for.

If you are using Debian Squeeze, you are out of luck (tcptrack exists in lenny and wheezy, but not in squeeze [?]), you will have to download and compile the lastest version. If you are running Gentoo, just emerge the net-analyzer/tcptrack ebuild.