Cities of Light

RedHat: Understanding the Predictable Network Interface Device Names Red Hat Enterprise Linux 7

en for Ethernet,
wl for wireless LAN (WLAN),
ww for wireless wide area network (WWAN). 

Tagged as: collection, delicious, links, linux, shaarli | Author: Martin Leyrer
[Montag, 20210802, 05:00 | permanent link | 0 Kommentar(e)

I do love my KeePassXC (and SyncThing to keep it in sync on multiple machines). But one thing that irked me was the fact that I had to create multiple entries for one site with several functional subdomains, like for example:

• www.example.com
• auth.example.com
• app.example.com

Of course cloned entries with references, but still it was manual work.

Until I searched for a better solution and found varjolintu’s comment on the corresponding issue on Microsoft GitHub. So to paraphrase hin, this is what you have to do:

In order to use the „wildcard feature”, enter https://example.com as the entry URL. This corresponds to an wildcard entry along the lines of https://*.example.com.

And of course an entry URL like https://example.example.com will match https://*.example.example.com.

With that, I am a happy camper :D

Tagged as: keepass, linux, password, passwordmanager, security | Author: Martin Leyrer
[Sonntag, 20210801, 15:22 | permanent link | 0 Kommentar(e)

I recently got flabergasted by Fedoras’ „Totem Movie Player” not being able to replay a recorded GoTo Meeting session. VLC of course was able to replay it.

After some searching, I found „ffprobe” and was able to figure out what was wrong with that recording:

$ ffprobe -i ~/Downloads/recording.mp4
...
   Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 14 kb/s, 0.05 fps, 600 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      creation_time   : 2021-05-20T12:43:36.000000Z
      handler_name    : Core Media Video 

Apparently, GoTo Meetings records video session where only slides are shown with 0.05 fps, which confuses Totem completely.

Fortunately, the fix was, thanks to ffmpeg, also rather easy:

$ ffmpeg -i  ~/Downloads/recording.mp4 -filter:v fps=30 -max_muxing_queue_size 9999 ~/Downloads/fixed.mp4

The „max_muxing_queue_size” I had to add to make it work. Some ffmpeg guru can probably explain why.

Tagged as: ffmpeg, ffprobe, gotmeeting, rant, video | Author: Martin Leyrer
[Sonntag, 20210801, 15:04 | permanent link | 0 Kommentar(e)

If you want to show the IP of your linux VM after boot (for use with local KVM, …), you have two options:

The easy way

echo My Ip address: \4{eth0}"" >>/etc/issue

Where you need to replace „eth0” with the name of your network interface (might be „enp0s3” or whatever).

The cumbersome systemd way

First, create a „/usr/bin/show-ip-on-boot.sh” script:

#!/bin/sh
ip a | grep "inet" | grep "eno" | awk -F/ '{print $1}' | awk '{print $2}'

and then create a systemd service for it, where you redirect the output to the console.

[Service]
Type=oneshot
ExecStart=/usr/bin/show-ip-on-boot.sh
StandardOutput=journal+console

I know, what solution I prefer … ;)

via stackexchange

Tagged as: linux, rant, sysadmin, systemd, vm | Author: Martin Leyrer
[Sonntag, 20210801, 14:14 | permanent link | 0 Kommentar(e)