Collect NCN MAC Addresses

This procedure can be used to to collect MAC addresses from the NCNs along with their assigned interface names for use with the Add NCN Data procedure. A temporary MAC address collection iPXE bootscript is put into place on the system to discover the MAC addresses of the NCNs, along with their associated interface names (such as mgmt0).

WARNING This procedure will temporarily break the system’s ability to properly boot nodes in the system.

Prerequisites

This procedure must be performed on a master or worker NCN that has the latest CSM documentation installed. See Check for latest documentation.

Procedure

  1. (ncn-mw#) Verify that the BMC_IP environment variable is set.

    echo ${BMC_IP}

  2. (ncn-mw#) Put the MAC address collection iPXE script in place.

    1. Save a backup of the current iPXE BSS bootscript.

      kubectl -n services get cm cray-ipxe-bss-ipxe -o yaml > cray-ipxe-bss-ipxe.backup.yaml

    2. Delete the cray-ipxe-bss-ipxe Kubernetes ConfigMap.

      kubectl -n services delete cm cray-ipxe-bss-ipxe

    3. Put the MAC address collection iPXE boot script into place.

      kubectl -n services create cm cray-ipxe-bss-ipxe --from-file=bss.ipxe=/usr/share/doc/csm/scripts/operations/node_management/Add_Remove_Replace_NCNs/mac_collection_script.ipxe

    4. Take note of the last timestamp in the cray-ipxe log.

      kubectl -n services logs -l app.kubernetes.io/instance=cms-ipxe

    5. Wait for the updated iPXE binary to be built.

      sleep 30
kubectl -n services logs -l app.kubernetes.io/instance=cms-ipxe -f

      The following output means that a new iPXE binary has been built:

      2022-03-17 22:16:14,648 - INFO    - __main__ - Build completed.
2022-03-17 22:16:14,653 - INFO    - __main__ - Newly created ipxe binary created: '/shared_tftp/ipxe.efi'

      Wait for a build notification message with a timestamp that is more recent than the timestamp recorded in the previous step.

  3. (ncn-mw#) Power on node and collect MAC addresses from the NCN.

    1. Verify that the NCN is off.

      read -s is used in order to prevent the password from being echoed to the screen or saved in the shell history.

      read -r -s -p "${BMC_IP} root password: " IPMI_PASSWORD
export IPMI_PASSWORD
ipmitool -I lanplus -U root -E -H "${BMC_IP}" chassis power status

    2. In another terminal, capture the NCN’s Serial Over Lan (SOL) console.

      read -s is used in order to prevent the password from being echoed to the screen or saved in the shell history.

      BMC_IP=BMC_IP_ADDRESS
read -r -s -p "${BMC_IP} root password: " IPMI_PASSWORD
export IPMI_PASSWORD
ipmitool -I lanplus -U root -E -H "${BMC_IP}" sol activate

      When disconnecting from the IPMI SOL console, use the key sequence ~~. to exit ipmitool without exiting the SSH session.

    3. Set the PXE efiboot option.

      ipmitool -I lanplus -U root -E -H "${BMC_IP}" chassis bootdev pxe options=efiboot

    4. Power on the NCN.

      ipmitool -I lanplus -U root -E -H "${BMC_IP}" chassis power on

    5. Watch the NCN SOL console and wait for the following output to appear.

      The output below shows the mapping of MAC addresses to interface names (mgmt0, mgmt1, hsn0, lan0, etc.).

      ====DEVICE NAMING=======================================================
net0 MAC ec:0d:9a:d4:2b:d8
net0 is hsn0
net1 MAC 98:03:9b:bb:a9:94
net1 is mgmt0
net2 MAC 98:03:9b:bb:a9:95
net2 is mgmt1
MAC Address collection completed. Please power the node off now via ipmitool.

      Using the above output from the MAC collection iPXE script, derive the following add_management_ncn.py script arguments:

      Interface MAC Address CLI Flag
      mgmt0 98:03:9b:bb:a9:94 --mac-mgmt0=98:03:9b:bb:a9:94
      mgmt1 98:03:9b:bb:a9:95 --mac-mgmt1=98:03:9b:bb:a9:95
      hsn0 ec:0d:9a:d4:2b:d8 --mac-hsn0=ec:0d:9a:d4:2b:d8

    6. Power off the NCN.

      ipmitool -I lanplus -U root -E -H "${BMC_IP}" chassis power off

  4. (ncn-mw#) Restore the original iPXE bootscript.

    1. Delete the cray-ipxe-bss-ipxe Kubernetes ConfigMaps.

      kubectl -n services delete cm cray-ipxe-bss-ipxe

    2. Put the original iPXE bootscript into place.

      cp -v cray-ipxe-bss-ipxe.backup.yaml cray-ipxe-bss-ipxe.yaml
yq d -i cray-ipxe-bss-ipxe.yaml metadata.resourceVersion
yq d -i cray-ipxe-bss-ipxe.yaml metadata.uid
kubectl -n services apply -f cray-ipxe-bss-ipxe.yaml

    3. Take note of the last timestamp in the cray-ipxe log.

      kubectl -n services logs -l app.kubernetes.io/name=cray-ipxe -c cray-ipxe

    4. Wait for the updated iPXE binary to be built.

      sleep 30
kubectl -n services logs -l app.kubernetes.io/name=cray-ipxe -c cray-ipxe -f

      The following output means that a new iPXE binary has been built.

      2022-03-17 22:16:14,648 - INFO    - __main__ - Build completed.
2022-03-17 22:16:14,653 - INFO    - __main__ - Newly created ipxe binary created: '/shared_tftp/ipxe.efi'

      Wait for a build notification message with a timestamp that is more recent than the timestamp recorded in the previous step.