Linux Miscellaneous

# KDE

• KDE Desktop Restart

  kquitapp5 plasmashell && kstart plasmashell

# KVM

1. Install KVM

   pacman -S qemu libvirt ovmf virt-manager virt-viewer dnsmasq vdebridge-utils openbsd-netcat

2. Start KVM

   	sudo systemctl enable libvirtd.service
   	sudo systemctl start libvirtd.service

3. Use with non root user

   sudo vim /etc/libvirt/libvirtd.conf

   found and delete '#'

   	#unix_sock_group = "libvirt"
   	#unix_sock_rw_perms = "0770"

4. Add new group and restart libvirt service

   	newgrp libvirt
   	sudo usermod -aG libvirt $USER
   	sudo systemctl restart libvirtd.service

5. Enable Nested Virtualization

   	echo "options kvm-intel nested=1" | sudo tee /etc/modprobe.d/kvm-intel.conf
   	cat /sys/module/kvm_intel/parameters/nested

# Doker

• Use with non root user

  	sudo usermod -aG docker $USER
  	newgrp docker

• Use on Raspberrypi

  	curl -fsSL https://get.docker.com -o get-docker.sh && sudo sh get-docker.sh
  	sudo groupadd docker
  	sudo gpasswd -a $USER docker
  	newgrp docker

• Portainer

  	docker volume create portainer_data
  	docker run -d -p 8000:8000 -p 9443:9443 --name portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce:latest

# PlatformIO

1. Install PlatformIO

   	curl -fsSL https://raw.githubusercontent.com/platformio/platformio-core-installer/master/get-platformio.py -o get-platformio.py
   	python3 get-platformio.py

2. Set System Environment

   sudo vim /etc/profile

   Insert append_path '$HOME/.platformio/penv/bin'

   Save and exit

   source /etc/profile

# Minicom

yay -S minicom

sudo minicom -s

+-----[configuration]------+

| Filenames and paths      |

| File transfer protocols  |

| Serial port setup        |

| Modem and dialing        |

| Screen and keyboard      |

| Save setup as dfl        |

| Save setup as..          |

| Exit                     |

| Exit from Minicom        |

+--------------------------+

select "Serial port setup" then "Save setup as dfl" or "Save setup as.."

if use "Save setup as..", connect drives like sudo minicom configurename

check device : sudo dmesg | grep tty or ls -l /dev/tty*

+-----------------------------------------------------------------------+

| A -    Serial Device      : /dev/ttyUSB0                              |

| B - Lockfile Location     : /var/run                                  |

| C -   Callin Program      :                                           |

| D -  Callout Program      :                                           |

| E -    Bps/Par/Bits       : 115200 8N1                                |

| F - Hardware Flow Control : No                                        |

| G - Software Flow Control : No                                        |

| H -     RS485 Enable      : No                                        |

| I -   RS485 Rts On Send   : No                                        |

| J -  RS485 Rts After Send : No                                        |

| K -  RS485 Rx During Tx   : No                                        |

| L -  RS485 Terminate Bus  : No                                        |

| M - RS485 Delay Rts Before: 0                                         |

| N - RS485 Delay Rts After : 0                                         |

|                                                                       |

|    Change which setting?                                              |

+-----------------------------------------------------------------------+

select "Save setup as dfl" and "Exit from Minicom"

use sudo minicom connect the serial device

Tips: When use minicom, use Ctrl + A Z to help, Ctrl + A X exit minicom