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RHEL6 post-installation
 
Once RHEL6 Minimal has been installed,
ifconfig -a
dhclient eth0
and login remotely.
 
Eventually disable firewalling,
chkconfig --list | grep tables
service iptables stop
service ip6tables stop
chkconfig iptables off
chkconfig ip6tables off
 
Eventually disable SElinux (permissive is enough so you might re-enable it),
getenforce
setenforce 0
vi /etc/sysconfig/selinux
SELINUX=permissive
 
Setup network,
ps aux | grep -i networkmanager (should NOT be running)
cd /etc/sysconfig/
vi network
NETWORKING=yes
HOSTNAME=long
GATEWAY=10.0.0.X
vi ../hosts
10.0.0.XX short short.example.local
10.0.0.XX long long.example.local
vi ../resolv.conf
domain example.net
nameserver x.x.x.x
nameserver x.x.x.x
nameserver x.x.x.x
cp ../resolfv.conf ../resolv.conf.bkp
cd network-scripts/
cp ifcfg-eth0 DIST.ifcfg-eth0
vi ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
IPADDR=10.0.0.X
NETMASK=255.255.252.0
ONBOOT=yes
Note. using short form as HOSTNAME and using domain in resolv.conf.
 
Eventually add you SSH key,
cd /root/
grep PermitRoot /etc/ssh/sshd_config
mkdir -p .ssh/
cd .ssh/
vi authorized_keys
(paste your public key)
you should now be able to relogin without a password.
 
Configure a repository e.g. (or use the default one pointing to the internet),
cd /etc/yum.repos.d/
mkdir .trash/
mv * .trash/
cat > centos67.repo <<EOF
[srvinstall]
name=srvinstall install server
baseurl=http://srvinstall/CentOS6.7/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
EOF
yum -y install screen ksh
and install vmware tools if it's a virtual machine ($ escaped),
cd /etc/yum.repos.d/
cat > vmware_rhel6.repo <<EOF
[vmware-tools]
name=VMware Tools for Red Hat Enterprise Linux \$releasever – \$basearch
baseurl=http://packages.vmware.com/tools/esx/latest/rhel6/\$basearch
enabled=1
gpgcheck=1
gpgkey=http://packages.vmware.com/tools/keys/VMWARE-PACKAGING-GPG-RSA-KEY.pub
EOF
yum -y install vmware-tools-esx-nox
ls -l /etc/init/vmware-tools-services.conf
reboot
Ref. Installing VMware tools on Centos 6 via yum
 
Install a few more packages,
yum -y groupinstall Base
rpm -q mailx man man-pages screen wget lynx lftp ntp vim-enhanced sysstat | grep ^package
yum -y install \
screen \
lynx \
lftp \
mutt \
ksh
Note. sendmail vs mailx on rhel6
 
Switch to the new network configuration,
screen
ifconfig
service network restart
ps aux | grep dhclient
pkill dhclient
ps aux | grep dhclient
hostname
hostname --long
ping google.com
you can now connect to the real IP and,
screen -ls
screen -rd
 
Configure the root and eventually admin user mail aliases,
cd /etc/
cp aliases aliases.dist
vi aliases
root: root@example.net
newaliases
date | mail -s rootalias root
tail /var/log/maillog
 
Disable listen on port 25,
cd /etc/postfix/
cp master.cf master.cf.dist
vi master.cf
#smtp inet n - n - - smtpd
service postfix restart
and check outgoing email still works,
date | mail -s postfixnolisten root
tail /var/log/maillog
 
Enable NTP,
vi /etc/ntp.conf
server YOUR_NTP_SERVER
server ntp.obspm.fr
chkconfig --list | grep ntp
service ntpd start
chkconfig ntpd on
ntpq -p
 
Eventually configure gnu screen,
cd /etc/
mv -i screenrc screenrc.dist
wget http://pbraun.nethence.com/configs/misc/screenrc
cd ~/
wget http://pbraun.nethence.com/configs/misc/.screenrc
screen
#^A :source /etc/screenrc
#^A :source /root/.screenrc
 
Eventually tune gnu bash,
cd /etc/
cat >> bashrc <<EOF

case "$-" in *i*)
alias ll='ls -alkF'
alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'
;;
esac
EOF
 
Configure LDAP client if you need to.
 
At this point you are ready to make a template out of this system, just switch to dhcp,
cd /etc/sysconfig/network-scripts/
vi ifcfg-eth0
DEVICE=eth0
BOOTPROTO=dhcp
#IPADDR=10.0.0.XX
#NETMASK=255.255.252.0
ONBOOT=yes
also remove the persistent hardware network devices,
cd /etc/udev/rules.d/
mkdir .trash/
mv 70-persistent-net.rules .trash/
Ref. http://www.cyberciti.biz/tips/vmware-linux-lost-eth0-after-cloning-image.html
 

Last update: Apr 22, 2016