I do not know much about networking at all, but I have given the following my best shot.
So I have a HP c7000 enclosure with BL460 g6 blades that have the latest (minimal, so no
ifconfig command) version of CentOS installed on them. At the back of the enclosure, there are 4x Cisco Catalyst Blade 3020 switches installed in interconnect bays 1, 2, 5, and 6. During installation of of CentOS, I plugged an ethernet cable from the back of the switch into my local network (which has a DHCP server), and CentOS detected that an ethernet connection exists. After installation however, I had no internet connection at all (ping 18.104.22.168, 22.214.171.124, google.com resulted in '
cannot resolve hostname'). Also, all of the gear is 2nd hand, so I have not setup/configured the Cisco switches at all. I was able to connect to the console page of the switch but since I did not know the username/password, I was unable to configure it.
Also, I tried to ssh into the blades from a separate device on the same network, but it could not connect. Furthermore, running
nmcli shows 3 network connections,
enp0s1, and both the
enp0s1 were 'unmanaged'. I have tried changing the config file for them to be managed, resetting the network manager as well as the blade itself but it did not work. After this, I tried connecting a HP 4GB Fibre Channel Pass-thru Module into interconnect bay 3, and iLO showed that the blades correctly map to the right ports into the pass through module. I then connected that port to a separate switch and connected that to the local network, however that did not work.
The goal I am trying to achieve is to have the blades run as a computing cluster, using OpenMPI for communication between blades and not connected to the internet in any way (only connected to the local network to control using ssh). How would I go about achieving this? As far as I know, having the 2 switches in the first 2 interconnect bays allows for the blades to communicate to each other, however even
nmcli shows that their is not ip address for the blades, only the hardware address for the ports. Any help will be much appreciated!