Configuring Forward and Reverse DNS Zones with BIND on Primary and Secondary Servers
Begin by disalbing SELinux and the firewall on both servers, then install BIND:
# On primary (192.168.32.168)
setenforce 0
systemctl stop firewalld
yum install bind -y
# On secondary (192.168.32.169)
setenforce 0
systemctl stop firewalld # corrected typo from 'filewalld'
yum install bind -y
Configure static IP addresses using nmcli:
# Primar ...
Posted on Wed, 13 May 2026 20:55:06 +0000 by NogDog
Troubleshooting Java DNS Cache NullPointerException in Multi-threaded Environments
Exception Manifestation
2018-03-16 18:53:59,501 ERROR [DefaultMessageListenerContainer-1] (com.bill99.asap.service.CryptoClient.seal(CryptoClient.java:34))- null
java.lang.NullPointerException
at java.net.InetAddress$Cache.put(InetAddress.java:779) ~[?:1.7.0_79]
at java.net.InetAddress.cacheAddresses(InetAddress.java:858) ~[?:1.7.0_79]
...
Posted on Wed, 13 May 2026 14:18:00 +0000 by why not
Understanding the Evolution and Architecture of the Domain Name System
Early computer networks relied on numeric IP addresses for communication among a limited number of hosts. As the number of connected devices grew, memorizing these addresses became impractical. UNIX introduced a local hosts file mapping hostnames to IPs, later adopted by Linux and Windows. When central file distribution proved unscalable, the D ...
Posted on Fri, 08 May 2026 13:48:48 +0000 by McManCSU