Fluency on the command line is a skill often neglected or considered arcane, but it improves your flexibility and productivity as an engineer in both obvious and subtle ways. This is a selection of notes and tips on using the command-line that we've found useful when working on Linux. Some tips are elementary, and some are fairly specific, sophisticated, or obscure. This page is not long, but if you can use and recall all the items here, you know a lot.

virt-install is a command line tool for creating new KVM , Xen or Linux container guests using the libvirt hypervisor management library. It allows you to create a VM and start an installation from the command line.

This article is a quick introduction to virt-install. It also has a copy pastable getting started examples for different distro's. Make sure to change the mirror to one near you for faster downloads.

lsof is the sysadmin/security über-tool. I use it most for getting network connection related information from a system, but that’s just the beginning for this powerful and too-little-known application. The tool is aptly called lsof because it “lists openfiles“. And remember, in UNIX just about everything (including a network socket) is a file.

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apt-dater provides an ncurses frontend for managing package updates on a large number of remote hosts using SSH. It supports Debian-based managed hosts as well as rug (e.g. openSUSE) and yum (e.g. CentOS) based systems.

Features:

    keep dozens up to hundrets of (GNU/Linux) hosts up to date
    generic apt-dater-host protocol to manage different package managers
    filter hosts by Tcl expressions
    multi instance capable
    spawn ssh-agent on startup (optional)
    run multiple connections in parallel using screen
    no root login required, use sudo to call package manager (optional)
    record any screen activities during install/upgrade/connect for traceability(optional)
    export host informations to XML for automatic processing
    upgrade hosts part of clusters one after another
    host informations collected:
        LSB informations (distri, codename, version)
        installed, upgradable, broken, extra and hold back packages
        identify physical/virtual machines
        kernel version and check if the most recent kernel is running

Une idée alternative pour gérer ses dotfiles.
Faudra que je teste...

Pouvoir servir du HTTPS et du SSH (et du OpenVPN...) simultanément sur le port 443.

pwnat, pronounced "poe-nat", is a tool that allows any number of clients behind NATs to communicate with a server behind a separate NAT with *no* port forwarding and *no* DMZ setup on any routers in order to directly communicate with each other. The server does not need to know anything about the clients trying to connect.

via sebsauvage (http://sebsauvage.net/links/?hXB20Q)