Cray System Management Documentation > Cray System Management (CSM) Administration Guide > security and authentication > Change Air-Cooled Node BMC Credentials

Change Air-Cooled Node BMC Credentials

This procedure will use the System Configuration Service (SCSD) to change all air-cooled Node BMCs in the system to the same global credential.

Limitations

All air-cooled and liquid-cooled BMCs share the same global credentials. The air-cooled Slingshot switch controllers (Router BMCs) must have the same credentials as the liquid-cooled Slingshot switch controllers.

Prerequisites

The Cray command line interface (CLI) tool is initialized and configured on the system. See Configure the Cray CLI.
Review procedures for SCSD in the Cray System Management (CSM) Administration Guide.

Procedure

Set the NEW_BMC_CREDENTIAL to specify the new root user password for air-cooled node BMCs.
```
ncn-m001# read -s NEW_BMC_CREDENTIAL
ncn-m001# echo $NEW_BMC_CREDENTIAL
```
Expected output:
```
new.root.password
```

Create an SCSD payload file to change all air-cooled node BMCs to the same global credential.

ncn-m001# cat > bmc_creds_glb.json <<DATA
{
    "Force":false,
    "Username": "root",
    "Password": "$NEW_BMC_CREDENTIAL",
    "Targets":
    $(cray hsm state components list --class River --type NodeBMC --format json | jq -r '[.Components[] | .ID]')
}
DATA

Inspect the generated SCSD payload file.
```
ncn-m001# cat bmc_creds_glb.json | jq
```
Apply the new BMC credentials.
```
ncn-m001# cray scsd bmc globalcreds create ./bmc_creds_glb.json
```
Troubleshooting: If the above command has any components that do not have the status of OK, they must be retried until they work, or the retries are exhausted and noted as failures. Failed modules need to be taken out of the system until they are fixed.