Is it possible to allow multiple SSH host keys for the same IP?











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I have a script that needs to connect to the currently active head of a high-availability cluster.



Each node in the cluster has a fixed hostname and IP address.

The current head additionally has a "virtual IP". In the case of a switchover or failover, another node configures the "virtual IP" and begins acting as the head.



Can I just point my script at the virtual IP? Won't ssh complain about mismatching host keys when the cluster moves the virtual IP to a different node?










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    I have a script that needs to connect to the currently active head of a high-availability cluster.



    Each node in the cluster has a fixed hostname and IP address.

    The current head additionally has a "virtual IP". In the case of a switchover or failover, another node configures the "virtual IP" and begins acting as the head.



    Can I just point my script at the virtual IP? Won't ssh complain about mismatching host keys when the cluster moves the virtual IP to a different node?










    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a script that needs to connect to the currently active head of a high-availability cluster.



      Each node in the cluster has a fixed hostname and IP address.

      The current head additionally has a "virtual IP". In the case of a switchover or failover, another node configures the "virtual IP" and begins acting as the head.



      Can I just point my script at the virtual IP? Won't ssh complain about mismatching host keys when the cluster moves the virtual IP to a different node?










      share|improve this question













      I have a script that needs to connect to the currently active head of a high-availability cluster.



      Each node in the cluster has a fixed hostname and IP address.

      The current head additionally has a "virtual IP". In the case of a switchover or failover, another node configures the "virtual IP" and begins acting as the head.



      Can I just point my script at the virtual IP? Won't ssh complain about mismatching host keys when the cluster moves the virtual IP to a different node?







      ssh failover






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      asked 2 days ago









      n.st

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          Yes, this is possible.



          sshd(8) (from OpenSSH) specifies the format of known_host files (in the section SSH_KNOWN_HOSTS FILE FORMAT):




          When performing host authentication, authentication is accepted if any matching line has the proper key; […]



          It is permissible (but not recommended) to have several lines or different host keys for the same names. This will inevitably happen when short forms of host names from different domains are put in the file. It is possible that the files contain conflicting information; authentication is accepted if valid information can be found from either file.




          Therefore you can just add the host keys of both HA heads to your ~/.ssh/known_hosts or /etc/ssh/ssh_known_hosts:



          203.0.113.50 ssh-rsa AAAAB3NzaC1yc2…6Yh5sHpkyIZvXLB
          203.0.113.50 ssh-rsa AAAAB3NzaC1yc2…R0RNVnMB6C4plFr


          and ssh will connect to both of them without any complaints.






          share|improve this answer





















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            up vote
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            down vote













            Yes, this is possible.



            sshd(8) (from OpenSSH) specifies the format of known_host files (in the section SSH_KNOWN_HOSTS FILE FORMAT):




            When performing host authentication, authentication is accepted if any matching line has the proper key; […]



            It is permissible (but not recommended) to have several lines or different host keys for the same names. This will inevitably happen when short forms of host names from different domains are put in the file. It is possible that the files contain conflicting information; authentication is accepted if valid information can be found from either file.




            Therefore you can just add the host keys of both HA heads to your ~/.ssh/known_hosts or /etc/ssh/ssh_known_hosts:



            203.0.113.50 ssh-rsa AAAAB3NzaC1yc2…6Yh5sHpkyIZvXLB
            203.0.113.50 ssh-rsa AAAAB3NzaC1yc2…R0RNVnMB6C4plFr


            and ssh will connect to both of them without any complaints.






            share|improve this answer

























              up vote
              1
              down vote













              Yes, this is possible.



              sshd(8) (from OpenSSH) specifies the format of known_host files (in the section SSH_KNOWN_HOSTS FILE FORMAT):




              When performing host authentication, authentication is accepted if any matching line has the proper key; […]



              It is permissible (but not recommended) to have several lines or different host keys for the same names. This will inevitably happen when short forms of host names from different domains are put in the file. It is possible that the files contain conflicting information; authentication is accepted if valid information can be found from either file.




              Therefore you can just add the host keys of both HA heads to your ~/.ssh/known_hosts or /etc/ssh/ssh_known_hosts:



              203.0.113.50 ssh-rsa AAAAB3NzaC1yc2…6Yh5sHpkyIZvXLB
              203.0.113.50 ssh-rsa AAAAB3NzaC1yc2…R0RNVnMB6C4plFr


              and ssh will connect to both of them without any complaints.






              share|improve this answer























                up vote
                1
                down vote










                up vote
                1
                down vote









                Yes, this is possible.



                sshd(8) (from OpenSSH) specifies the format of known_host files (in the section SSH_KNOWN_HOSTS FILE FORMAT):




                When performing host authentication, authentication is accepted if any matching line has the proper key; […]



                It is permissible (but not recommended) to have several lines or different host keys for the same names. This will inevitably happen when short forms of host names from different domains are put in the file. It is possible that the files contain conflicting information; authentication is accepted if valid information can be found from either file.




                Therefore you can just add the host keys of both HA heads to your ~/.ssh/known_hosts or /etc/ssh/ssh_known_hosts:



                203.0.113.50 ssh-rsa AAAAB3NzaC1yc2…6Yh5sHpkyIZvXLB
                203.0.113.50 ssh-rsa AAAAB3NzaC1yc2…R0RNVnMB6C4plFr


                and ssh will connect to both of them without any complaints.






                share|improve this answer












                Yes, this is possible.



                sshd(8) (from OpenSSH) specifies the format of known_host files (in the section SSH_KNOWN_HOSTS FILE FORMAT):




                When performing host authentication, authentication is accepted if any matching line has the proper key; […]



                It is permissible (but not recommended) to have several lines or different host keys for the same names. This will inevitably happen when short forms of host names from different domains are put in the file. It is possible that the files contain conflicting information; authentication is accepted if valid information can be found from either file.




                Therefore you can just add the host keys of both HA heads to your ~/.ssh/known_hosts or /etc/ssh/ssh_known_hosts:



                203.0.113.50 ssh-rsa AAAAB3NzaC1yc2…6Yh5sHpkyIZvXLB
                203.0.113.50 ssh-rsa AAAAB3NzaC1yc2…R0RNVnMB6C4plFr


                and ssh will connect to both of them without any complaints.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 2 days ago









                n.st

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                5,22611843






























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