Linux

Import GPG-Keys on Fedora

Fix the permissions of the enclosing directory ~/.gnupg because an attacker with enough rights on the folder could manipulate folder contents. Make sure, the folder+contents belong to you: Correct access rights for .gnupg and subfolders: finally import your keys with your user (not sudo/root)

Continue reading...

Citrix on Fedora32

In case you need to get Citrix working under Fedora these are the steps that worked for me: First of all download the client from https://www.citrix.com/de-de/downloads/citrix-receiver/linux/receiver-for-linux-latest.html and make sure you download the WebReceiverOnly package as the Selfservice-Package needs webkitgtk to work which is not provided by the Fedora32 repository. Install client and crypto-libs Update libcrypto reference in desktop file Extract system ca-certificates and install in the Citrix cacerts directory Citrix Receiver expects libidn.so.11 so you need to link it to 12.6: Then start your Citrix application via the downloaded ica-file

Continue reading...

sending mail after successful backup

In case you want cron to tell you that your backup job has been finished you can use MSMTP to send you the logs for your cronjob via e-mail: After install with apt-get install mstmp, setup aliases in your /etc/aliases file: Then make sure your config in /etc/msmtprc looks something like this: Then you are ready to test: To make the finished cron job send the mail add something like the following to your /etc/crontab or crontab -e

Continue reading...

monitoring Jitsi with Zabbix

If you want to monitor your Jitsi Server (number of logged on user, running sessions, etc.) with Zabbix you first have to enable Colibri Stats on your Jitsi server secondly import a monitoring Template to your zabbix server Enable stats on Jitsi Server edit /etc/jitsi/videobridge/sip-communicator.properties and add/alter the lines: then add in /etc/jitsi/videobridge/config : And restart with Then check if port 8080 is open with: check if data gets delivered via json-file: Trying to open the page with your browser might not work as the statistics are not available through https but your http-header forces a ssl-redirect (depending on you...

Continue reading...

Open Source video conferencing Jitsi now available

To make my video conferences private and secure I have implemented the open source video conference solution Jitsi on my website. You can now reach it through https://jitsi.arvidortwig.de It’s open source, based on webrtc, secured by ssl (https) and there is no registration neccessary. I also don’t save any logfiles or anything else. Feel free to use it for you corona-conferencing 😉 The android smartphone app is available on F-Droid: https://f-droid.org/en/packages/org.jitsi.meet/

Continue reading...

Uncomplicated Firewall ufw

UFW is a comfortable yet powerful interface for ip-tables. It is, thanks to ufw, now very easy to configure and monitor your firewall. Install UFW Uncomplicated Firewall should be installed by default, but if it is not installed on your system, you can install the package by typing: Check UFW Status Once the installation is completed you can check the status of UFW with the following command: UFW is disabled by default. If you never activated UFW before, the output will look like this: If UFW is activated, the output will look similar to the following: UFW Default Policies By...

Continue reading...

Upgrading VMWare ESXi 6.7

Upgrading your VMWare ESXi instance is quite easy if you know how 😉 Enable SSH in your webinterface and login via SSH to the esx-shell. Download the patch via wget from https://my.vmware.com/group/vmware/patch#search and enter following commands: Enable maintenance mode install the update from your datastore: Notice that the command is not “upgrade” which requieres to update all predecessing upgrade packages, but “install” which allows to install the Update directly. Finally reboot and disable the maintenance mode:

Continue reading...

VMS with oracle virtual box instead of gnome boxes

Unfortunately Windows is still neccessary to do taxes online in Germany (with Elster – Elektronische Steuererklärung). Thats why I need to run Windows on a virtual machine on top of my Debian 10 / Gnome System. With Gnome theres “Gnome Boxes” coming, a interface for QUEMU. While Boxes allows to install and run VMs quite easily working on it through a virtual Windows Interface, is slow and lacks performance. Windows offers gui access through RDP (Remote Desktop Protocol), which is quite fast and comfortable, but even after extensive search and fixing attempts I have not managed to create a bridged...

Continue reading...