SLES Remote Administration with Secure Shell SSH

SLES server physically reside on Data Center
So as administrator , you can access these servers by one of the following :

the first method : working on server Directly on datacenter , which impractical 🙁 , just Skip it
the second method : is working on SLES server remotely with text mode using ssh [secure Shell ] : which will be DONE in this article
the third method : is working on SLES server remotely with Graphical mode through VNC : which we be DONE in next article

before moving to configure SSH

letus to have a look to above network diagram

we have user called Sami@pioneers.lab from IT staff who is working on computer IT161 on subnet LAN

Sami would like to access SLES124 on subnet [servers farm ]

OK, configuring SSH process involved with the following steps :

first of all we have to check if package openssh [which is responsible of running sshd] is installed or NOT

use command :

zypper info  openssh

if openssh is NOT installed > then simply install it using command

zypper install --no-confirm openssh

now we have to check if service sshd is running

use command :

systemctl status sshd

if NOT started then > start it

systemctl start sshd

also we have to Enable sshd during system startup

systemctl enable sshd

create firewall rule to enable ssh

firewall-cmd --permanent --add-service=ssh

then reload firewall

firewall-cmd --reload

to it’s time to open port 22 in network firewall

it’s depend on your network firewall , in networks pioneers : we are using network firewall PFsense

on client computer install Putty or ant remote connection tool

as sami@pioneers.lab connect to SLES124 from IT161

in this article : we see how to configure remote administration with secure shell ssh

in next article : we will see how to configure remote administration with VNC

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