Difference: InstallingCentOS6 (8 vs. 9)

Revision 920 Oct 2017 - IvoVanGeel

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Installing CentOS 6

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Make sure root cannot log in via ssh by changing /etc/ssh/sshd_config:
- PermitRootLogin without-password
- This will disable logging in as root, via ssh, but it is still possible to log in as root using SSH public key authentication.

Deleted:

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Disable SELinux by setting SELINUX=disabled in /etc/sysconfig/selinux (a reboot is needed to disable SELinux)

Disable the firewall (when in a secure network), by running: chkconfig iptables off; chkconfig ip6tables off
Add the following line to /etc/sysconfig/network:
- NOZEROCONF=yes
Install the following packages:

Changed:

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< yum install irqbalance sysstat iotop strace tcpdump lsof ntp man man-pages man-pages-overrides mlocate wget openssh-clients perl iptraf-ng bind-utils

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> yum install -y irqbalance sysstat iotop strace tcpdump lsof ntp man man-pages man-pages-overrides mlocate wget openssh-clients perl iptraf-ng bind-utils vim-enhanced

Enable irqbalance: chkconfig irqbalance on (only useful on an SMP system)
Set up /etc/ntp.conf:

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server 2.nl.pool.ntp.org server 3.nl.pool.ntp.org

Changed:

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Change /etc/sysconfig/ntpdate:

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Change /etc/ntp/step-tickers:

Changed:

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< OPTIONS="-U ntp -s -b 0.nl.pool.ntp.org 1.nl.pool.ntp.org"

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> 0.nl.pool.ntp.org 1.nl.pool.ntp.org

Enable ntpdate and ntpd: chkconfig ntpdate on; chkconfig ntpd on
Reboot the system to activate all changes

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