SRE – Systems/Network

Watch, Read, Listen

  • Testing an ISO or an USB bootable drive with QEMU

    If you want to test an ISO image or a bootable USB drive you just prepared, you can do it very easily thanks to QEMU with a simple command-line. Obviously, you will need to install the QEMU package first so you can use it. For example on a Debian-based distribution: sudo apt-get install qemu qemu-system…

  • NMap main command-lines

    Nmap (“Network Mapper”) is a free and open source (license) utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to determine what hosts are…

  • Find main DNS servers for a given domain name

    It can be useful to find the main DNS servers for a domain name and see if you can query it directly to ensure the value you got from your DNS server is the most recent. For this, you can simply use nslookup tools, which is available by default on either most Unix distributions and also…

  • Use FTPS (SSL/TLS) with Python 2.6

    By default, Python 2.6 does not permit to open an FTPS connection (using SSL/TLS) and restricts the use of non secure protocol FTP. However, it’s possible to get around this lack by using the FTP library available since version 2.7, which is fully compatible and supported with 2.6. You can get the library directly from…

  • Customize Google Agenda display (URL / HTML integration)

    As you certainly know, it’s possible to easily integrate a Google Agenda to your website by using the steps described in Google support: https://support.google.com/calendar/answer/41207&hl=en When you are integrating the agenda, several parameters can be configured directly using the graphical interface available through Google Agenda. But sometimes it can happen that some options are not available…

  • Chrome tabs and bookmarks bar became big (with Chrome 37)

    With Google Chrome 37, depending on your screen resolution, it’s possible that yout get a tabs bar and a bookmarks bar much bigger than usually. No worries, there is an easy and quick workaround for this! For that, just follow next steps: Perform a right click on your Chrome shortcut and then go to Properties…

  • Google Agenda synchronization is only working one-way (Computer to Phone)

    It can happen that while you are creating an event on your computer, this one is correctly synchronized with your smartphone few minutes later. However, the contrary doesn’t work: you are trying to create an event on your smartphone, but this one never appears on your computer … frustrating!! This is due to the fact…

  • Encrypt Hard Drive Disk under Linux – LUKS and cryptsetup

    You want to add a new hard drive disk (or a new partition) to your Linux system but this disk will contain some private data then you want it to be encrypted so you can restrict its access to whom will have the key. Be careful, there are some parameters you have to take in…

  • Display local videos from PC to Chromecast

    You would like to deliver some media content from your Chrome PC to your Chromecast for local videos, you can so use Plex Media Server which is now fully compatible with Chromecast! For that, just follow the next steps: Download Plex Media Server (free) from: https://plex.tv/downloads (“Computer” version and not “NAS” if it’s for a PC usage). Install…

  • Google chrome – Updates are disabled by the administrator

    You didn’t change anything on your computer, you’re the only user and administrator but are still getting this error of “Updates are disabled by the administrator” ? Following steps will help you to fix this issue easily: Ensure you have administrator rights, you will need them Use keyboard shortcut “Windows + R” to access “Execute” menu…