Ssh – How to enable ssh on startup in opensuse

opensusessh

My experience with Linux is limited and as part of a project, I ordered a Linux dedicated server. This is an unmanaged server with OpenSuSE 13.2. When I try to ssh into the server, I get a connection refused message

ssh: connect to host xxx.xxx... port 22: Connection refused

I think their default image does not comes with ssh enabled on startup but I may be wrong. They provide a rescue system which is a Linux system installed and loaded from ram for troubleshooting. When I load this, I can connect to the system via SSH. I can mount the hdd and make changes.

I'd like to know how to check and/or whatever configuration changes that need to be done to enable ssh on startup for OpenSuSE 13.2 from within a recovery system. I can provide any configuration file contents if required. I'm basically from a Windows background and hence if you can provide verbose steps, it will be helpful.

As part of my research, I checked init.d file, there was no sshd file in there, ssh is installed I guess as there exists files in /etc/ssh like `/etc/ssh/sshd_config.

Best Answer

1. Verify installation

Run which sshd to get the path it is called from. If you don't get /usr/sbin/sshd in response, it is most likely not installed.

2. Installing sshd

Run zypper in openssh to install the application.

3. Check firewall

Run the command cat /etc/sysconfig/SuSEfirewall2 | grep sshd.

You need to see FW_CONFIGURATIONS_EXT="sshd" - This means the firewall allows incoming traffic on port 22.

If you do not find it, you may add it using a text editor like this:

vi /etc/sysconfig/SuSEfirewall2 and locate the line where it says FW_CONFIGURATIONS_EXT="" and change it to FW_CONFIGURATIONS_EXT="sshd"

4. Check the service is running

systemctl status sshd | grep Active - If you get Active: inactive (dead) you need to start it with systemctl start sshd.

Run the command again systemctl status sshd | grep Active and you should now see Active: active (running) since ...

5. Enable SSH on startup

systemctl enable sshd

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Linux – How to configure VNC in Linux Suse

It sounds like you probably are getting connected, but don't have any X desktop configured. Check out this page for instructions on configuring a different desktop manager (you can probably skip the sections about installation and go right to the section on Configuring).

Ssh – How to automate SSH login with password

Don't use a password. Generate a passphrase-less SSH key and push it to your VM.

If you already have an SSH key, you can skip this step… Just hit Enter for the key and both passphrases:

$ ssh-keygen -t rsa -b 2048
Generating public/private rsa key pair.
Enter file in which to save the key (/home/username/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/username/.ssh/id_rsa.
Your public key has been saved in /home/username/.ssh/id_rsa.pub.

Copy your keys to the target server:

$ ssh-copy-id id@server
id@server's password:

Now try logging into the machine, with ssh 'id@server', and check-in:

.ssh/authorized_keys

Note: If you don't have .ssh dir and authorized_keys file, you need to create it first

to make sure we haven’t added extra keys that you weren’t expecting.

Finally, check to log in…

$ ssh id@server

id@server:~$

You may also want to look into using ssh-agent if you want to try keeping your keys protected with a passphrase.

Best Answer

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