VICOSYS

yum update

vi /etc/ntp.conf
vi /etc/sysconfig/selinux
vi /etc/sysconfig/network-scripts/ifcfg-eth0


yum install kernel-devel

If you have 4 GB or more RAM use the Linux kernel compiled for PAE capable machines. Your machine may not show up total 4GB ram. All you have to do is install PAE kernel package.

This package includes a version of the Linux kernel with support for up to 64GB of high memory. It requires a CPU with Physical Address Extensions (PAE).
The non-PAE kernel can only address up to 4GB of memory. Install the kernel-PAE package if your machine has more than 4GB of memory (>=4GB).

To install PAE Kernel.

yum install kernel-PAE

if you are trying to run a command via sudo and encounter the following error:

sudo: sorry, you must have a tty to run sudo

then you can comment out the following parameter in the /etc/sudoers

#Defaults requiretty

On the client that requires to login to the remote, execute the following command to generate the public and private keys.

[root@localhost ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
3e:b1:6d:44:73:e6:ca:af:3c:06:48:f1:f2:c1:5a:b6 root@localhost.localdomain

append the public key to the remote server
on the client
cat ~/.ssh/id_rsa.pub
ssh-rsa AAAAB3NzaC1yc2EAAAABIwA3AQEAsr8DueNT........... root@localhost.localdomain

on the server
echo "ssh-rsa AAAAB3NzaC1yc2EAAAABIwA3AQEAsr8DueNT........... root@localhost.localdomain"
>> ~/.ssh/authorized_keys2

You may need to change root@localhost.localdomain to suit your need.

Create if /etc/sysconfig/static-routes does not exist.

# Routing to HK
eth0 net 192.168.2.0 netmask 255.255.255.0 gw 172.16.1.6
eth0 net 192.168.1.8 netmask 255.255.255.248 gw 172.16.1.6
# Routing to Japan
eth0 net 192.168.3.0 netmask 255.255.255.0 gw 172.16.1.1
eth0 net 192.168.4.0 netmask 255.255.255.0 gw 172.16.1.1

hwclock --systohc