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Apologies if this question isn't sophisticated enough, I am sort of new to Gnu/Linux. I've 4 VMs in Azure all running CentOS, 1 master and 3 workers.

I've set up a passwordless authentication between these using ssh-keygen and ssh-copy-id commands and added hostnames with respective IP addresses into the /etc/hosts file. Everything works OK. However if I log into the master not from my work laptop, but from my home machine (using putty), with the same user I cannot do ssh worker1 anymore, I get permission denied (public_key) and I don't understand why it is, as this was set between the hosts, why does it matter where I'm logging in from. Can anyone explain please?

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  • Can you run the @ form on both?: ssh -vvv user@machine, and run ssh-add -l on both machines. Edit question to show the output of both commands. Have you added the public key of your home machine to the servers? – ctrl-alt-delor Jul 10 at 17:51
  • It the master called worker1? – ctrl-alt-delor Jul 10 at 17:52
  • There is a master and worker1, worker2 and worker3. So i can log into the master from my home machine using the username and password, but i cannot do ssh worker1 or ssh worker2 anymore, it works if i log in from the same machine which i've used to set up the authentication from but not from another machine. In principle is it a normal behavior? Is there some MAC address stamp or anything like that...? – user361738 Jul 10 at 18:05
  • Oh that is not what you said in the question. Can you update the question. – ctrl-alt-delor Jul 10 at 18:10
  • There is a master and worker1, worker2 and worker3. No i haven't added public key of my home machine, but i've added a public key of an 'admin' user on master to all 3 workers so i expect it should work no matter which host i login from. I can log into the master from my home machine using the username and password, but i cannot do ssh worker1 or ssh worker2 anymore, it works if i log in from the same machine which i've used to set up the authentication from but not from another machine. In principle is it a normal behavior? Is there some MAC address stamp or anything like that...? – user361738 Jul 10 at 18:12
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You probably uploaded a wrong public key to the worker machines. Check the ~/.ssh/authorized_keys file on workers and make sure it matches the public key (probably ~/.ssh/id_rsa.pub) on the master node.

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