Notepad:Linux: Difference between revisions

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* Yum install with missing deps
* Yum install with missing deps
  rpm -Uvh --nodeps $(repoquery --location <module>)
  rpm -Uvh --nodeps $(repoquery --location <module>)
* [[Notepad:LVM Snapshot| LVM Snapshot]]
 
* [https://www.linuxquestions.org/questions/slackware-14/how-to-configure-iptables-for-router-with-2-public-ip-addresses-4175618196/ Example routing iptables firewall]
* [https://www.linuxquestions.org/questions/slackware-14/how-to-configure-iptables-for-router-with-2-public-ip-addresses-4175618196/ Example routing iptables firewall]
* [[Notepad:Disable IPv6 | Disable IPv6]]
* [[Notepad:Disable IPv6 | Disable IPv6]]
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* Get Ethernet Address of network (Exclude lo, virtual and ethernet)
* Get Ethernet Address of network (Exclude lo, virtual and ethernet)
   ip -br l | awk '$1 !~ "lo|vir|eth" { print $3 }'
   ip -br l | awk '$1 !~ "lo|vir|eth" { print $3 }'
* [https://www.linuxjournal.com/content/bash-trap-command bash TRAP command]
  tempfile=/tmp/tmpdata
  trap "rm -f $tempfile" EXIT
== IoT ==
* [https://raspberrypi.stackexchange.com/questions/139093/change-netplan-wifi-encrypted-password Generate Encoded Password for Netplan / network-config - use psk]
  wpa_passphrase <ssid> [passphrase]
* [https://stackoverflow.com/questions/73397110/how-to-stop-ubuntu-pop-up-daemons-using-outdated-libraries-when-using-apt-to-i Ubuntu stop pop-up for daemons for apt]
Change the restart command in ```/etc/needrestart/needrestart.conf``` to 'i'
  sed "/#\$nrconf{restart} = 'i';/s/.*/\$nrconf{restart} = 'a';/" /etc/needrestart/needrestart.conf
* Create a user password hash to automatically add
  mkpasswd -m sha-512 PASSWORD [SALT]
* [https://www.simplylinuxfaq.com/2020/03/how-to-completely-disable-boot-or-startup-messages.html x86 Suppress message at boot]
  /etc/default/grub
  GRUB_TIMEOUT_STYLE=hidden
  GRUB_HIDDEN_TIMEOUT_QUIET=true
  GRUB_CMDLINE_LINUX_DEFAULT="rhgb quiet rd.plymouth=0 plymouth.enable=0 --log-level=0 systemd.log_level=0 systemd.show_status=0"
  grub2-mkconfig -o /boot/grub2/grub.cfg
* Raspberry Pi4 ubuntu suppress log at boot
  /boot/firmware/cmdline.txt
  (eliminate console=tty1)
  rd.plymouth=0 plymouth.enable=0 --log-level=0 systemd.log_level=0 systemd.show_status=0
* RPi4 use ubuntu-frame from [https://github.com/MirServer/ubuntu-frame/issues/39]
  /boot/firmware/config.txt
  dtoverlay=vc4-fkms-v3d
  # dtoverlay=dwc2
or
  sed -i "/dtoverlay=dwc2/s/.*/dtoverlay=vc4-fkms-v3d/" /boot/firmware/config.txt


== LVM Expand ==
== LVM ==
=== LVM Expand ===
Shutdown the volume and use qemu to expand
  qemu-img resize <disk.qcow2> <+XXG>
restart
Expand the physical size
Expand the physical size
  gparted
  gparted
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Resize the file system
Resize the file system
  resize2fs /dev/vg.../lv...
  resize2fs /dev/vg.../lv...
 
=== [[Notepad:LVM Snapshot| LVM Snapshot]] ===


{{notepad}}
{{notepad}}

Latest revision as of 02:42, 20 July 2023

Linux Tips and Tricks

Linux stuff I often have to lookup. Just my personal list of things. 


shutdown -rF now

xauth add `hostname`/unix:0 . `openssl rand -hex 32`
  • yum versionlock - allows to lock an rpm
  • install faster random for dns etc.
 yum install haveged;
 systemctl enable haveged;
 systemctl start haveged

sudo visudo -f /mnt/etc/sudoers

netstat -tulpn

xargs yum -y install < file
  • Create Default Home Directory
mkhomedir_helper username

use tmpfiles.d and have your package create at startup or boot a file or directory /usr/lib/tmpfiles.d/mydaemon.conf :
man tmpfiles.d

#Type Path            Mode UID      GID    Age Argument
d     /run/mydaemon   0755 myuser myuser   -   -

rpm -Uvh --nodeps $(repoquery --location <module>)

  sudo journalctl --vacuum-time=3weeks

  ip -br l | awk '$1 !~ "lo|vir|eth" { print $3 }'

  tempfile=/tmp/tmpdata
  trap "rm -f $tempfile" EXIT

IoT

  wpa_passphrase <ssid> [passphrase]

Change the restart command in ```/etc/needrestart/needrestart.conf``` to 'i' 

  sed "/#\$nrconf{restart} = 'i';/s/.*/\$nrconf{restart} = 'a';/" /etc/needrestart/needrestart.conf
  • Create a user password hash to automatically add
  mkpasswd -m sha-512 PASSWORD [SALT]

  /etc/default/grub
  GRUB_TIMEOUT_STYLE=hidden
  GRUB_HIDDEN_TIMEOUT_QUIET=true

  GRUB_CMDLINE_LINUX_DEFAULT="rhgb quiet rd.plymouth=0 plymouth.enable=0 --log-level=0 systemd.log_level=0 systemd.show_status=0" 

  grub2-mkconfig -o /boot/grub2/grub.cfg
  • Raspberry Pi4 ubuntu suppress log at boot
  /boot/firmware/cmdline.txt
  (eliminate console=tty1)
  rd.plymouth=0 plymouth.enable=0 --log-level=0 systemd.log_level=0 systemd.show_status=0
  • RPi4 use ubuntu-frame from [1]
 /boot/firmware/config.txt
 dtoverlay=vc4-fkms-v3d
 # dtoverlay=dwc2

or 

  sed -i "/dtoverlay=dwc2/s/.*/dtoverlay=vc4-fkms-v3d/" /boot/firmware/config.txt

LVM

LVM Expand

Shutdown the volume and use qemu to expand 

  qemu-img resize <disk.qcow2> <+XXG>

restart Expand the physical size 

gparted

Expand the logical volume 

lvextend -l +100%FREE /dev/vg.../lv....

Resize the file system 

resize2fs /dev/vg.../lv...

LVM Snapshot

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