RHCE on RHEL 6 Exam EX300 Preparation
Authored by an RHCE 6 who has taken the official class (RedHat System Administration III)
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Detailed steps show how to complete each exam objective
Learn what you need to memorize for each objective and exactly where to reference the man pages and config files quickly for the rest
Save time and prepare for the exam quickly, even if you have taken the class how long will it take to gather this information?
You are well on your way to being prepared when you can quickly complete each objective without any reference outside of the operating system
PDF Document
Exam Ojectives Covered:
https://www.redhat.com/certification/rhce/objectives/
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SAMPLE OBJECTIVE:
_____________________________________________________________________
DNS
Configure a caching-only name server
yum -y install bind
chkconfig named on
Listen on all ports / interface(s), Allow query from any, turn off DNS security
/etc/named.conf
options {
listen-on port 53 { any; }; # Default 127.0.0.1
listen-on-v6 port 53 { ::1; };
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt";
allow-query { any; }; # Default localhost
recursion yes;
dnssec-enable yes;
dnssec-validation no; # Default: yes (This is critical)
dnssec-lookaside auto;
/* Path to ISC DLV key */
bindkeys-file "/etc/named.iscdlv.key";
};
Configure a caching-only name server to forward DNS queries
Note: Candidates are not expected to configure master or slave name servers
- Add forwarders statement to options section above in /etc/named.conf
forwarders { 192.168.0.50; }; # IP of DNS server(s) to forward to
NOTE: Other options can be used as an example for syntax, but you need to remember that a “forwarders” statement needs to be created.
Also: man named.conf → search forward
Service named restart
Open service: DNS on Firewall
Test with nslookup from other system:
nslookup
server <dns server>
nslookup <host FQDN of test query>
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