itbj/ArchCheatSheet.md

## ArchCheatSheet.md

      
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    ArchLinux Cheat Sheet
Network configuration


List network devices
  # ip link


Enabling and disabling network interfaces
  # ip link set <network interface> up
  # ip link set <network interface> down


To check the result:
  # ip link show dev <network interface>


Start the DHCP service :
  # systemctl start dhcpcd@<network interface>.service


Enable DHCP service to be started on bootup:
  # systemctl enable dhcpcd@<network interface>.service


Install and start Network File System (NFS) :
  # pacman -S nfs-utils
  # systemctl start nfs-server.service
  # systemctl enable nfs-server.service


Manage packages with pacman


Install a new package
  # pacman -S <package name>


Update all package
  # pacman -Syu


Remove all the cached packages that are not currently installed
  # pacman -Sc


Recursively removing orphans packages and their configuration files
  # pacman -Rns $(pacman -Qtdq)


System and service manager : systemd
Arch Linux uses systemd as the init process.


List running units
  # systemctl


Start a unit immediately
  # systemctl start <unit>


Stop a unit immediately
  # systemctl stop <unit>


Restart a unit
  # systemctl restart <unit>


Reload configuration
  # systemctl reload <unit>


Show the status of a unit
  $ systemctl status <unit>


Check whether a unit is already enabled or not
  $ systemctl is-enabled <unit>


Enable a unit to be started on bootup
  # systemctl enable <unit>


Disable a unit to not start during bootup
  # systemctl disable <unit>


Check if any systemd services have entered in a failed state
  # systemctl --failed


Miscellaneous


Kernel warning : "intel_rapl : no valid rapl domains found in package 0"
Create and edit /etc/modprobe.d/blacklist.conf file with :
  blacklist intel_rapl


Add an user
  # useradd -m -G users -s /bin/bash <username>


Kernel warning : "ACPI : No IRQ available for PCI Interrupt Link [LNKS]. Try pci=noa"


Open /boot/grub/grub.cfg


In the Arch Linux entry menu, find the line beginning with linux


At the end of this line add
	acpi=noirq


Example :
	linux   /vmlinuz-linux root=UUID=a590453b-f844-4cf5-a74f-66a945eb2434 rw  quiet acpi=noirq


To test this change before on a temporary grub.cfg modification, type e on menu entry in the boot loader to enter in edit mode.


Show boot log
  journalctl -b


Enable SSH service to be started on bootup:
  systemctl enable sshd.service


General recommendations
System maintenance
pacman -S samba gvfs gvfs-smb sshfs