Setting up rsh on two Redhat 6 servers
Environment:
1. Two redhat 6 servers hostnames: 1. redhat_1, 2. redhat_2
2. Rsh packages required: rsh.x86_64, rsh-server.x86_64
3. IP address:
redhat_1: 192.168.2.3 redhat_2: 192.168.2.4
4. Turn off the firewall and SElinux on both machines.
Introduction:
The rsh service comes under xinetd.
Steps:
Perform the below steps on both the machines..!!!!!!!
Turn off firewall and SELinux on both the machines as follows.
Links:
To turn off firewall:
1. /etc/init.d/iptables - IPv4 iptables firewall service.
2. /etc/init.d/ip6tables - IPv6 iptables firewall service.
To disable firewall run the below command:
service iptables stop
chkconfig iptables off
To turn off IP6 firewall:
# service ip6tables stop
# chkconfig ip6tables off
To turn off the firewall service permanently:
[root@redhat_2 ~]# chkconfig iptables off
To check the fireall service startup status:
[root@redhat_2 ~]# chkconfig --list iptables
iptables 0:off 1:off 2:off 3:off 4:off 5:off 6:off
To verify firewall is disabled or not:
/sbin/iptables -L -v -n
Turn off SELinux:
Link:
To turn off SELinux
http://www.cyberciti.biz/faq/howto-turn-off-selinux/
Disable SELinux temporarily:
setenforce 0
Disable SELinux permanently edit the below file:
vi /etc/sysconfig/selinux
Change the SELINUX parameter in the file:
SELINUX=disabled
REBOOT the machine for the effect to take place:
reboot
Finally setting up rsh environment:
Links:
http://people.redhat.com/kzak/docs/rsh-rlogin-howto.html
http://www.itzgeek.com/how-tos/linux/centos-how-tos/setup-remote-shell-access-on-centos-6-rhel-6.html
1. Install the rsh packages on both the machines if not installed already.
To check if installed already run:
yum list installed "*rsh*"
To install the packages:
yum install rsh.x86_64
yum install rsh-server.x86_64
Edit the rsh configuration file to enable rshd server daemon:
/etc/xinetd.d/rsh
Change disabled from Yes to NO if not set already.
disable = no
Restart the xinetd service.
service xinetd restart
Editing /etc/securetty on both the servers and include the below entries to the end:
rsh
rlogin
rexec
Creating .rhosts file:
The .rhosts file must be modified to include the names of the remote workstations, file should be under the home directory of the user who’s account is going to be used to execute the commands over a network.
vi ~/.rhosts
redhat_1
redhat_2
Make sure that .rhosts entries are pingable from both the servers, add the entries to /etc/hosts or DNS.
Creating hosts file:
Any user from the above systems can execute the command as root.
Add a full permission to use the command over the network. Plus sign will give a full permission.
vi /etc/hosts.equiv + +
Enable rsh, rlogin, rexec, xinetd services to start in boot:
chkconfig rsh on
chkconfig rlogin on
chkconfig rexec on
chkconfig xinetd on
Testing rsh:
Run the below command:
rsh redhat_2 uptime
[root@redhat_1 ~]# rsh redhat_2 uptime
06:04:38 up 2:44, 4 users, load average: 0.00, 0.00, 0.00
