From 793a23c859d873cef71a6e79fea896a22dda82a3 Mon Sep 17 00:00:00 2001
From: Hugh Ratsch <hugh.ratsch.18@gmail.com>
Date: Thu, 20 Feb 2025 03:21:31 -0600
Subject: [PATCH] updated notes

---
 src/rhcsa.md | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/src/rhcsa.md b/src/rhcsa.md
index 30983a8..ac8f4d4 100644
--- a/src/rhcsa.md
+++ b/src/rhcsa.md
@@ -779,3 +779,55 @@ sudo less /etc/services # Display the services
 ```
 
 ## Manage DNS and Logging
+
+### resolv.conf
+```bash
+sudo nano /etc/resolv.conf # Edit the resolv.conf file
+
+sudo systemctl restart NetworkManager # Restart the NetworkManager service
+```
+
+### nsswitch.conf
+```bash
+sudo nano /etc/nsswitch.conf # Edit the nsswitch.conf file
+
+sudo systemctl restart NetworkManager # Restart the NetworkManager service
+```
+
+### query dns
+```bash
+dig www.google.com # Query the DNS server for www.google.com
+
+dig -x 192.168.1.1 # Query the DNS server for the reverse lookup(PTR) of 192.168.1.1
+
+nslookup www.google.com # Query the DNS server for www.google.com
+
+nslookup -type=mx gmail.com # Query the DNS server for the MX records for gmail.com
+```
+
+### logging
+```bash
+sudo journalctl # Display the journal
+sudo journalctl -xe # Display the journal and show the boot messages
+sudo journalctl -f # Display the journal and follow the log
+
+sudo journalctl -u httpd # Display the journal for the httpd service
+
+sudo journalctl --since "1 hour ago" # Display the journal for the last hour
+sudo journalctl --since "1 hour ago" --until "2 hour ago" # Display the journal for the last hour and until 2 hours ago
+```
+
+### rsyslog
+```bash
+sudo nano /etc/rsyslog.conf # Edit the rsyslog configuration file
+
+sudo systemctl restart rsyslog # Restart the rsyslog service
+
+sudo systemctl status rsyslog # Display the status of the rsyslog service
+```
+
+### logrotate
+```bash
+sudo nano /etc/logrotate.conf # Edit the logrotate configuration file\
+```
+