updated notes

src/rhcsa.md

@@ -505,7 +505,7 @@ sudo dnf install nfs-utils # Install the NFS utilities
 sudo nano /etc/exports # Edit the exports file
 
 # Add the following line to the exports file:
-/mnt/nfs # The directory to export
+/mnt/nfs 192.168.1.0/24(rw,sync,no_subtree_check) # The directory to export
 
 sudo exportfs -r # Export the NFS shares
 sudo exportfs # Display the NFS shares
@@ -517,6 +517,45 @@ sudo systemctl start nfs-server # Start the NFS server
 ```bash
 sudo dnf install nfs-utils # Install the NFS utilities
 
+sudo nano /etc/fstab # Edit the fstab file
+
+# Add the following line to the fstab file:
+192.168.1.1:/mnt/nfs /mnt/nfs nfs defaults 0 0
+
+sudo mount -a # Mount the NFS shares
+
 sudo mount 192.168.1.1:/mnt/nfs /mnt/nfs # Mount the NFS share
 sudo umount /mnt/nfs # Unmount the NFS share
 ```
+
+### NTP
+```bash
+sudo dnf install ntp # Install the NTP utilities
+
+sudo ntpdate time.nist.gov # Update the time
+sudo ntpq -p # Display the NTP peers
+sudo ntpstat # Display the NTP status
+
+### Timezone and Time Commands ###
+sudo timedatectl set-timezone America/Chicago # Set the timezone to America/Chicago
+sudo timedatectl set-time "12:00:00" # Set the time to 12:00:00
+sudo timedatectl set-ntp true # Enable the NTP service
+sudo timedatectl set-ntp false # Disable the NTP service
+
+### chrony
+```bash
+sudo dnf install chrony # Install the chrony utilities
+
+sudo chronyc sources # Display the chrony sources
+sudo chronyc tracking # Display the chrony tracking
+sudo chronyc sources -v # Display the chrony sources with more detail
+
+sudo nano /etc/chrony.conf # Edit the chrony configuration file
+
+# Add the following line to the chrony configuration file:
+server time.nist.gov iburst # Add the NIST time server
+pool 2.rhel.pool.ntp.org iburst # Add the RHEL time server
+
+sudo systemctl start chronyd # Start the chrony service
+sudo systemctl enable chronyd # Enable the chrony service to start on boot
+```