Alan Le

Systems Administrator

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hostname

hostname cc.mis.com

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Bind NIC

netstat -tulpn | grep :25
cd /etc/sysconfig/network-scripts/

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crontab

crontab —> /etc/cron.allow —> /etc/cron.deny

Hosts

cat /etc/hosts
cat /etc/hosts.allow
cat /etc/hosts.deny
*browser* resolve hostnames - no need to go to the DNS to resolve either hostname or ip address***

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HTTPD Installation

yum -y install httpd
yum provides httpd
service httpd start 
chkconfig httpd on
lsof -i
netstat

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Iptables NAT


Step-By-Step Configuration of NAT with iptables
Static IP Addresses location.
***GUI -On the other hand -just delete then add the new IP address, you don't need to know where...

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iptables

/etc/sysconfig/iptables
service iptables save
iptables-save > filename
iptables -L
route -v
ip route show

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SELinux

/etc/selinux/config
seinfo
grep -C 3 look file or grep -B 3 -A 2 what inlogfile

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PXE Installation

mkdir
mount,cp
service xinetd start
chkconfig xinetd on

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Kickstart

vi
chmod

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June 2012
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