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--- linux [2026/09/07 13:45] – reddy
+++ linux [2026/10/25 21:18] (current) – Added sysctl commands reddy
@@ Line 152: / Line 152: @@
 # Start with a GUI desktop
 sudo systemctl set-default graphical.target
+</code>
+==== Disable SystemD Resolv from port 53 ====
+Edit /etc/systemd/resolved.conf
+<code>
+#DNSStubListener=yes
+DNSStubListener=no
+</code>
+Then, restart the systemd-resolved service.
+==== Send SystemD Resolv requests to another DNS server ====
+In /etc/system/resolved.conf.d/otherservice.conf
+<code>
+[Resolve]
+DNS=1.2.3.4
+Domains=~mytest
+</code>
+==== Scan for bad sectors ====
+<code>
+badblocks -v /dev/sda1 > bs.txt
+fsck -l bs.txt /dev/sda1  # -l adds adds the bad block list to the filesystem
+smartctl -H /dev/sda  # Perform health check
+smartctl -A /dev/sda  # Look at Reallocated_Sector_CT and Current_Pending_Sector
+</code>
+==== Grub Boot ====
+<code>
+sudo grub-install --recheck /dev/sda
+sudo update-grub
+</code>
+==== Sysctl ====
+<code>
+sysctl -a  # List all parameters
+sysctl <param>  # List a specific parameter Eg. kernel.hostname, vm.swappiness
+sysctl -w <param>=<value>  # Temporary change to parameter
+sysctl -p <config_file>  # Reload from config (If no file specified, /etc/sysctl.conf)
 </code>