updated notes

src/rhcsa.md

@@ -912,4 +912,34 @@ dig google.com # Query the DNS server for google.com
 sudo vim /etc/resolv.conf # Edit the resolv.conf file
 ### change the nameserver to 8.8.8.8
 nameserver 8.8.8.8
+```
+
+### Recovering the Root Password
+```bash
+### reboot the system
+sudo reboot
+
+### press esc to get to the grub menu
+### press e to edit the grub menu
+
+### go to the line that starts with linux16
+### scroll down to the end of the line
+
+### delete rhgb quiet
+
+### add the init=/bin/bash to the end of the line
+... init=/bin/bash
+
+### press ctrl+x to boot into single user mode
+### mount the root filesystem
+mount -o remount,rw /
+
+### change the root password
+passwd root
+
+### inform selinux to allow the root password change
+touch /.autorelabel
+exec /usr/lib/systemd/systemd
+
+### the system may take a while to boot
 ```