Cray System Management Documentation > Cray System Management (CSM) Administration Guide > system configuration service > Configure BMC and Controller Parameters with SCSD

Configure BMC and Controller Parameters with SCSD

The System Configuration Service (SCSD) allows administrators to set various BMC and controller parameters for components in liquid-cooled cabinets. These parameters are typically set during discovery, but this tool enables parameters to be set before or after discovery. The operations to change these parameters are available in the cray CLI under the scsd command.

The parameters which can be set are:

SSH key
NTP server
Syslog server
BMC/Controller passwords
SSH console key

IMPORTANT: If the scsd tool is used to update the SSHConsoleKey value outside of ConMan, it will disrupt the ConMan connection to the console and collection of console logs. See ConMan for more information about remote consoles and collecting console logs.

However, this procedure only describes how to change the SSH key to enable passwordless SSH for troubleshooting of power down and power up logs on the node BMCs.

See Manage Parameters with the SCSD Service for more information about these topics for changing the other parameters:

Retrieve current information from targets
Retrieve information from a single target
Set parameters for targets
Set parameters for a single BMC or controller
Set Redfish credentials for multiple targets
Set Redfish credentials for a single target

The NTP server and syslog server for BMCs in the liquid-cooled cabinet are typically set by MEDS.

Details

Save the public SSH key for the root user.

ncn# export SCSD_SSH_KEY=$(cat /root/.ssh/id_rsa.pub | sed 's/[[:space:]]*$//')

Generate a System Configuration Service configuration via the scsd tool.

The administrator must be authenticated to the Cray CLI before proceeding. See Configure the Cray CLI.

ncn# cat > scsd_cfg.json <<DATA
{
   "Force":false,
   "Targets": $(cray hsm inventory redfishEndpoints list --format=json | jq '[.RedfishEndpoints[] | .ID]' | sed 's/^/ /'),
   "Params":{
      "SSHKey":"$(echo $SCSD_SSH_KEY)"
   }
}
DATA

Inspect the generated scsd_cfg.json file.

Ensure that the following are true:
- The component name (xname) list looks valid/appropriate
- The SSHKey settings match the desired public key
Run the CLI command.
```
ncn# cray scsd bmc loadcfg create scsd_cfg.json
```
Check the output to verify all hardware has been set with the correct keys. Passwordless SSH to the root user should now function as expected.
Test access to a node controller in the liquid-cooled cabinet.

SSH into the node controller for the host xname. For example, if the host xname is x1000c1s0b0n0, then the node controller xname would be x1000c1s0b0.

If the node controller is not powered up, then this SSH attempt will fail.
```
ncn-w001# ssh x1000c1s0b0
```

The logs from power actions for node 0 and node 1 on this node controller are in /var/log.

x1000c1s0b0# cd /var/log
x1000c1s0b0# ls -l powerfault_*

Expected output looks similar to the following:

-rw-r--r--    1 root     root           306 May 10 15:32 powerfault_dn.Node0
-rw-r--r--    1 root     root           306 May 10 15:32 powerfault_dn.Node1
-rw-r--r--    1 root     root          5781 May 10 15:36 powerfault_up.Node0
-rw-r--r--    1 root     root          5781 May 10 15:36 powerfault_up.Node1