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--- computing:miscadmin [2022/02/23 17:34] – oemb1905
+++ computing:miscadmin [2024/04/14 18:54] – oemb1905
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   * **miscadmin**
@@ Line 255: / Line 254: @@
   done
- --- //[[jonathan@haacksnetworking.org|oemb1905]] 2022/02/23 10:34//
+-fix badly configured zpool that used short names to by-id names. This command can be entered as-is, and does not need to be adjusted at all for what your specific ids are or for multiple drives. It literally exports the short names and by-ids, unmounts the volumes/pool, then remakes it using the blkid.
+  zpool export tank
+  zpool import -d /dev/disk/by-id tank
+monitor ram usage every 3 seconds in human readable way
+  free -h -w -s 3
+postfix to relay, satellite option, enter the relay like this:  to prevent lookups
+  [smtp.smtpserver.com]:587
+Re-attach to screen session that's attached.
+  screen -d -r <session#.user>
+mysqldump to local from remote
+  ssh root@hub.haacksnetworking.org /usr/bin/mysqldump --all-databases --single-transaction --skip-comments --skip-dump-date > hknet.sqldump
+Turn off sleep.
+  sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target
+Amd gPU errors fix
+  mkdir ~/Repositories
+  cd /home/user/Repositories && git clone https://kernel.googlesource.com/pub/scm/linux/kernel/git/firmware/linux-firmware.git
+  sudo cp /home/user/Repositories/linux-firmware/amdgpu/* /lib/firmware/amdgpu && sudo update-initramfs -k all -u -v
+Unattended Upgrades
+  sudo apt install unattended-upgrades
+  sudo apt install apt-config-auto-update
+  sudo unattended-upgrades --dry-run --debug
+  sudo systemctl status unattended-upgrades
+Next ... ssh failed attempts
+  grep "Failed password" /var/log/auth.log
+  journalctl _SYSTEMD_UNIT=ssh.service | egrep "Failed|Failure"
+  faillock --user <user>
+  grep "authentication failure" /var/log/auth.log | awk '{ print $14 }' | cut -b7-  | sort | uniq -c
+Display Managers (Lightdm, etc.)
+  sudo nano /etc/lightdm/lightdm-gtk-greeter.conf
+  [SeatDefaults]
+  allow-guest=false
+  greeter-hide-users=true
+  nano ~/.config/gtk-3.0/settings.ini
+  [Settings]
+  gtk-application-prefer-dark-theme=1
+  sudo nano /etc/lightdm/lightdm.conf
+  cd /usr/share/lightdm/light.conf.d/
+Setting ufw to allow connections to only certain subnets.
+  ufw allow from 192.168.1.0/24 to any proto tcp port 8006
+ --- //[[jonathan@haacksnetworking.org|oemb1905]] 2024/01/28 20:31//

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