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--- computing:miscadmin [2022/09/05 16:16] – oemb1905
+++ computing:miscadmin [2024/12/07 19:48] (current) – oemb1905
@@ Line 262: / Line 262: @@
   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.
- --- //[[jonathan@haacksnetworking.org|oemb1905]] 2022/02/25 00:24//
+  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 10.16.16.0/24 to any proto tcp port 8006
+  ufw allow from 10.36.36.0/24 to any proto tcp port 8006
+  ufw allow from 10.16.16.0/24 to any proto tcp port 22
+  ufw allow from 10.36.36.0/24 to any proto tcp port 22
+  ufw allow from 10.16.16.0/24 to any proto tcp port 80
+  ufw allow from 10.36.36.0/24 to any proto tcp port 80
+  ufw allow from 10.16.16.0/24 to any proto tcp port 443
+  ufw allow from 10.36.36.0/24 to any proto tcp port 443
+Establish NIC name using mac:ID
+  nano /etc/udev/rules.d/70-persistent-net.rules
+  SUBSYSTEM=="net",ACTION=="add",ATTR{address}=="00:00:00:00:00:00",ATTR{type}=="1",NAME="eth100"
+Establish Nemo as default, remove desktop icons, verify nemo default
+  xdg-mime default nemo.desktop inode/directory application/x-gnome-saved-search
+  gsettings set org.gnome.desktop.background show-desktop-icons false
+  xdg-mime query default inode/directory
+Sury php
+  sudo apt install -y apt-transport-https lsb-release ca-certificates wget
+  wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
+  echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/php.list
+Static ipv6 in ifupdown
+  iface enp0s3 inet6 static
+    address 2001:db8:1000::1
+    netmask 64
+    gateway 2001:db8:1000::1
+    autoconf 0
+    dns-nameservers 2001:4860:4860::8888 2001:4860:4860::8844
+Assigning an interface a persistent name so that bridging and static ifupdown assignments don't fail on reboot.
+  sudo nano /etc/udev/rules.d/70-persistent-net.rules
+  SUBSYSTEM=="net",ACTION=="add",ATTR{address}=="29:af:2c:34:g7:11",ATTR{type}=="1",NAME="eth100"
+Convert pdf to Word
+  libreoffice --infilter="writer_pdf_import" --convert-to docx Terms-Of-Service.pdf
+Instruct a client to ignore the DNS server offers made by the router on Debian.
+  sudo nano /etc/dhcp/dhclient.conf
+In that file, find the section that begins with ''request subnet-mask'' and remove domain-name-servers from it.
+  request subnet-mask, broadcast-address, time-offset, routers,
+    domain-name, __domain-name-servers__, domain-search, host-name,
+    dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers,
+    netbios-name-servers, netbios-scope, interface-mtu,
+    rfc3442-classless-static-routes, ntp-servers;
+After that's removed, find the section that begins with ''prepend domain-name-servers 127.0.0.1;'' and change it as you see fit:
+  prepend domain-name-servers 192.168.1.20;
+  prepend domain-name-servers 192.168.1.21;
+  sudo systemctl restart networking
+After you restart networking, run ''cat /etc/resolv.conf'' and make sure the DNS is what you desired. In order to test whether there are DNS leaks, use tcpdump and adjust port to 53, 5335, 853, etc.
+  tcpdump -vv -x -X -s 1500 -i eth0 'port 853'
+In order to set a policy on Chrome to stop DOT, or DNS over TLS/https, do the following:
+  sudo nano /etc/opt/chrome/policies/managed/policies.json
+  {
+  "BrowserGuestModeEnabled": false,
+  "BrowserAddPersonEnabled": false,
+  "IncognitoModeAvailability": 1,
+  "DnsOverHttpsMode": false,
+  "ExtensionSettings": {"*": {"installation_mode": "blocked"}}
+  }
+Running Debian testing/unstable and your zfs modules suddenly won't load after a reboot and upgrade, well do the following:
+  sudo apt-get install linux-headers-$(uname -r)
+Alright ....
+ --- //[[webmaster@haacksnetworking.org|oemb1905]] 2024/12/07 19:48//

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