Linux

Install Oracle Virtual Box Extensions

In order to access full resolution inside your VM and to access USB Devices with full USB3 Speed you need to install Virtual Box Extensions: Go to https://download.virtualbox.org/virtualbox and select the appropriate version. Then download the extension pack, e.g. Oracle_VM_VirtualBox_Extension_Pack-6.1.12.vbox-extpack Then open VirtualBox >> Preference >> Extensions >> browse for extension pack by clicking on the + icon. Click on the install button and choose the file. To access you usb devices you also need to add your user to group vboxusers

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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)

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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

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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

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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...

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