Text mode basics

iso
http://isoredirect.centos.org/centos/6/isos/

# vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
HWADDR=06:01:78:a7:00:33
NETMASK=255.255.255.0
IPADDR=192.168.0.10
TYPE=Ethernet

# vi /etc/sysconfig/network

NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=jroboplc.centos
GATEWAY=192.168.0.1

# vi /etc/resolv.conf

  nameserver 192.168.0.1

# dhclient eth0
# yum install mc

/etc/sysconfig/network:

NETWORKING=yes

/etc/sysconfig/network-scripts/ifcfg-eth0:

DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes  

(src1) (src2)

# adduser plc
# passwd plc

# adduser admin
# passwd admin

(src1) (src2) troubleshooting

on the server side

# yum -y install openssh-server openssh-clients
# service sshd start

on the client side:

$ ssh-keygen -t rsa  
$ ssh-copy-id -i ~/.ssh/id_rsa.pub admin@192.168.1.8
$ ssh-add
$ ssh root@192.168.1.8

on the server side again:
edit /etc/ssh/sshd_config:

AuthorizedKeysFile  /etc/ssh/%u/authorized_keys

and do:

# rmtuser=admin
# mkdir -p /etc/ssh/${rmtuser}
# cp /home/${rmtuser}/.ssh/authorized_keys /etc/ssh/${rmtuser}/
# chown -R ${rmtuser}:${rmtuser} /etc/ssh/${rmtuser} -R
# chmod 755 /etc/ssh/${rmtuser}
# chmod 644 /etc/ssh/${rmtuser}/authorized_keys
# service sshd restart

on the client side:

$ ssh admin@192.168.1.8

# yum install kernel-devel
# yum install make
# yum install gcc 

# yum install lm_sensors
# sensors-detect
$ sensors

(serial) (permissions)

# dmesg | egrep --color 'serial|ttyS'
# usermod -a -G dialout plc

test post access:

# yum install setserial
$ setserial -g /dev/ttyS0 

uport:

# yum upgrade
# yum install make
# yum install gcc 
# make install

open port 3033
/etc/sysconfig/iptables:

  -A INPUT -m state --state NEW -m tcp -p tcp --dport 3033 -j ACCEPT

# service iptables restart

# dhclient eth0
# yum install mc

/etc/sysconfig/network:

NETWORKING=yes

/etc/sysconfig/network-scripts/ifcfg-eth0:

DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes  

(src1) (src2)

# yum -y install openssh-server openssh-clients

/etc/ssh/sshd_config:

PermitRootLogin no

# chkconfig sshd on
# service sshd start
# yum install kernel-devel
# yum install make
# yum install gcc