Podcasting With Pulse

The goal is to create a simple solution to live stream a podcast. This means I need a audio stream which combines the thing I hear and the things I say.

To achieve this I mostly copied what makefu does. The first step is to figure out what the name of your input and output device is. You can find that with:

pacmd list-sources | grep -e device.string -e 'name:'

Which will provide you with output like this:

	name: <alsa_output.pci-0000_00_1b.0.analog-stereo.monitor>
		device.string = "0"
	name: <alsa_input.pci-0000_00_1b.0.analog-stereo>
		device.string = "front:0"
	name: <alsa_output.pci-0000_01_00.1.hdmi-stereo-extra1.monitor>
		device.string = "1"
	name: <alsa_output.usb-Focusrite_Scarlett_Solo_USB-00.analog-stereo.monitor>
		device.string = "2"
	name: <alsa_input.usb-Focusrite_Scarlett_Solo_USB-00.analog-stereo>
		device.string = "front:2"

As we can see here my output device is: alsa_output.usb-Focusrite_Scarlett_Solo_USB-00.analog-stereo.monitor and my input device is alsa_input.usb-Focusrite_Scarlett_Solo_USB-00.analog-stereo.

Now my problem is that my input device is stereo but my microphone only records in mono. But this is easy to fix, we can just remap our input to mono like this:

pactl load-module module-remap-source master=alsa_input.usb-Focusrite_Scarlett_Solo_USB-00.analog-stereo master_channel_map=front-left,front-right channels=2 channel_map=mono,mono

If we check the list of devices again we have a new input device called alsa_input.usb-Focusrite_Scarlett_Solo_USB-00.analog-stereo.remapped. And this will be the input device we use.

Now we can just create a new stream and map input and output to it:

# create stream
pactl load-module module-null-sink sink_name=stream sink_properties=device.description="Streaming"

# map input and output
pactl load-module  module-loopback source=alsa_output.usb-Focusrite_Scarlett_Solo_USB-00.analog-stereo.monitor sink=stream latency_msec=1
pactl load-module  module-loopback source=alsa_input.usb-Focusrite_Scarlett_Solo_USB-00.analog-stereo.remapped sink=stream latency_msec=1

The only thing left is to have a darkice which is compiled with mp3 support and then you can stream to any [icecast}(http://icecast.org/) server like this:

darkice -c stream.cfg

My config looks like this:

[general]
duration = 0
bufferSecs = 5
reconnect = yes
realtime = no
rtprio = 2

[input]
sampleRate = 44100
bitsPerSample = 16
channel = 2
device = pulseaudio
paSourceName = stream.monitor

[icecast2-0]
format=mp3
channel=2
bitrate=128
bitrateMode=cbr
quality=0.6
server=dns.name.or.ip.of.your.icecast.server
name=Testi test
description=Test test
public=yes
localDumpFile=dump.mp3
mountPoint=your_mountpoint.mp3
password=XXXXX
port=9000

And thats it, happy streaming!

Telegraf Snmp Hp Switch Monitoring

Monitore a HP 1810-24G Switch (J9450A) with telegraf, influxdb and grafana over snmp. Sounds complicated and convoluted but it's not I swear.

Basically you need to do two things. (Well if you have a running telegraf, influxdb and grafana setup and your HP switch has snmp enabled)

The plan was to use ifXTable but for a reason unknown to me it didn't work. So here is the inputs.snmp config I use:

[[inputs.snmp]]
    agents = [ "SWITCH_IP:161" ]
    community = "notpublic"
   [[inputs.snmp.field]]
     name = "hostname"
     oid = "SNMPv2-MIB::sysName.0"
     is_tag = true
   
    # Port 01
    [[inputs.snmp.field]]
       name = "if_01_name"
       oid = "IF-MIB::ifName.1" 
    [[inputs.snmp.field]]
       name = "if_01_speed"
       oid = "IF-MIB::ifSpeed.1" 
    [[inputs.snmp.field]]
       name = "if_01_in_octets"
       oid = "IF-MIB::ifInOctets.1" 
    [[inputs.snmp.field]]
       name = "if_01_out_octets"
       oid = "IF-MIB::ifOutOctets.1" 
    [[inputs.snmp.field]]
       name = "if_01_in_error"
       oid = "IF-MIB::ifInErrors.1" 
    [[inputs.snmp.field]]
       name = "if_01_out_error"
       oid = "IF-MIB::ifOutErrors.1" 

....     

    # Port 24
    [[inputs.snmp.field]]
       name = "if_24_name"
       oid = "IF-MIB::ifName.24" 
    [[inputs.snmp.field]]
       name = "if_24_speed"
       oid = "IF-MIB::ifSpeed.24" 
    [[inputs.snmp.field]]
       name = "if_24_in_octets"
       oid = "IF-MIB::ifInOctets.24" 
    [[inputs.snmp.field]]
       name = "if_24_out_octets"
       oid = "IF-MIB::ifOutOctets.24" 
    [[inputs.snmp.field]]
       name = "if_24_in_error"
       oid = "IF-MIB::ifInErrors.24" 
    [[inputs.snmp.field]]
       name = "if_24_out_error"
       oid = "IF-MIB::ifOutErrors.24"

The full config can be found here to copy & paste: fliiiix/2921c168182b27b27d8aca2bdb5f83b0

And then the second step is to create a the graph in grafana.

grafana config

Note: it's times 8 because the value you get over snmp is octets. And don't forget to change the Unit to bits/sec on the Units tab.

If you are lazy and need all 24 ports on one dashboard here you can find my config. Don't forget to search and replace my hostname (atlas.l33t.network) with your hostname.

Plexpy Is Now Tautulli

What is tautulli? From there site: "Tautulli is a 3rd party application that you can run alongside your Plex Media Server to monitor activity and track various statistics." And if you where already a plexpy user, it's the same but better. And here is how you migrate your existing plexpy installation to tautulli.

The first thing is to install it:

pkg install tautulli

Note: I'm not sure if this port is already in the quarterly package repos since I build my own packages.

Update the /etc/rc.conf to (tautulli_user is by default nobody):

tautulli_enable="YES"
tautulli_user="plex"

Stop plexpy and copy the config and database. Make sure config.ini and tautulli.db are owned by the tautulli_user you use!

service plexpy stop
cp /usr/local/plexpz/config.ini /var/db/tautulli/config.ini
cp /usr/local/plexpz/plexpy.db /var/db/tautulli/tautulli.db

And that's it you can start tautulli and enjoy the cool new interface.

service tautulli start

Hidpi Display Configuration

Apparently it is too hard to ship with a default configuration, that works well with HiDPI displays. And my Dell XPS 13 has a HiDPI display. But fear not, it's not that hard to configure when you know which files you should change. So here is what's working for me with i3 as window manager. (This should probably work for everything using XServer.)

The first file we need is ~/.Xresources

Xft.dpi: 192
Xft.autohint: 0
Xft.lcdfilter:  lcddefault
Xft.hintstyle:  hintfull
Xft.hinting: 1
Xft.antialias: 1
Xft.rgba: rgb

I don't think all these options are needed, but as I said, works for me™️.

To finally get ~/.Xresources loaded you need the ~/.xinitrc file.

xrdb -merge ~/.Xresources

Btw: this is also part of my dotfiles.

Revive Grub

A long time ago in a galaxy far, far away I wrote my last blog post. Since then much has changed and is still the same. But this blog post is about something which happened also a long time ago. I upgraded my Lenovo Yoga to a Dell XPS 13. And this change meant that I stopped using the linux on my Lenovo Yoga. Which was very convenient at the time because my dual boot stopped working. The reason for that was that my grub.cfg got corrupted and I was only able to boot windows. Since the Dell XPS 13 picked up all my daily linux tasks, there was no need to do something about it. But today this changes! I told my self, mostly because I plan to convert that thing to a windows only laptop. Yeah I know windows buuuhh me.

Rebuild Grub

So here is how I rebuilt my grub config:

Step one download and create a live Fedora usb stick. Yes I still use and love Fedora deal with it :D Boot it and open a console and find out who the boss is (hopefully you!).

sudo -s

Apparently I had a luks setup back in the days. So here is how to decrypt and mount it:

sudo cryptsetup luksOpen /dev/sda8 rootfs
sudo mount /dev/mapper/rootfs /mnt
mount: /mnt: unknown filesystem type 'swap'.

Well maybe it would help not to pick the swap partion, so close it fast before someone realizes sudo cryptsetup luksClose rootfs. So here is what happens when you actually select the right partition:

[liveuser@localhost ~]$ sudo cryptsetup luksOpen /dev/sda9 rootfs
Enter passphrase for /dev/sda9: 
[liveuser@localhost ~]$ sudo mount /dev/mapper/rootfs /mnt
[liveuser@localhost ~]$ ls /mnt/
1  bin  boot  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var

Almost done my /boot and the efi life on different partitions so I need to mount them as well:

mount /dev/sda7 /mnt/boot        
mount /dev/sda2 /mnt/boot/efi

Some bind mount magic:

sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys

chroot and build a new config

chroot /mnt
grub2-mkconfig --output=/boot/efi/EFI/fedora/grub.cfg

Reboot and hurray everything worked fine. It's just sad that I don't have anything on that laptop that I still need. What a waste of time.