Shut down management services and power off the HPE Cray EX management Kubernetes cluster.
Important: When performing a complete system shutdown, do NOT start with this page. Refer to System Power Off Procedures for the expected shutdown sequence.
Understand the following concepts before powering off the management non-compute nodes (NCNs) for the Kubernetes cluster and storage:
mon
processes. If one of the storage nodes goes down, then Ceph can rebalance the data onto the remaining nodes and object storage daemons (OSDs) to regain full protection.kubelet process on each node retrieves information from the etcd
cluster about which pods must be running. If a node becomes unavailable for more than five minutes, then Kubernetes creates replacement pods on other management nodes.The sat bootsys command automates the shutdown of Ceph and the Kubernetes management cluster and performs these tasks:
etcd and which freezes the state of the Kubernetes cluster on each management node.kubelet on each management and worker node.containerd on each management and worker node.mon process.sat command. See the “SAT Authentication” section of the HPE Cray EX System Admin Toolkit (SAT) product stream
documentation (S-8031) for instructions on how to acquire a SAT authentication token.sat commands, ensure /root/.bashrc has proper handling of kubectl commands on all master and worker nodes. See Prepare the System for Power OffTo check the health and status of the management cluster before shutdown, see the “Platform Health Checks” section in Validate CSM Health.
Check the health and backup status of etcd clusters:
Determine whether the etcd clusters are healthy.
Check the status of etcd cluster backups and make backups if missing.
(ncn-m001#) Check the status of NCN no wipe settings.
Make sure that metal.no-wipe=1. If any management NCNs do not have that set, then review
Check and Set the metal.no-wipe Setting on NCNs before proceeding.
/opt/cray/platform-utils/ncnGetXnames.sh
Example output:
+++++ Get NCN Xnames +++++
=== Can be executed on any worker or master ncn node. ===
=== Executing on ncn-m001, Thu Mar 18 20:58:04 UTC 2021 ===
=== NCN node xnames and metal.no-wipe status ===
=== metal.no-wipe=1, expected setting - the client ===
=== already has the right partitions and a bootable ROM. ===
=== Requires CLI to be initialized ===
=== NCN Master nodes: ncn-m001 ncn-m002 ncn-m003 ===
=== NCN Worker nodes: ncn-w001 ncn-w002 ncn-w003 ===
=== NCN Storage nodes: ncn-s001 ncn-s002 ncn-s003 ===
Thu Mar 18 20:58:06 UTC 2021
ncn-m001: x3000c0s1b0n0 - metal.no-wipe=1
ncn-m002: x3000c0s2b0n0 - metal.no-wipe=1
ncn-m003: x3000c0s3b0n0 - metal.no-wipe=1
ncn-w001: x3000c0s4b0n0 - metal.no-wipe=1
ncn-w002: x3000c0s5b0n0 - metal.no-wipe=1
ncn-w003: x3000c0s6b0n0 - metal.no-wipe=1
ncn-s001: x3000c0s7b0n0 - metal.no-wipe=1
ncn-s002: x3000c0s8b0n0 - metal.no-wipe=1
ncn-s003: x3000c0s9b0n0 - metal.no-wipe=1
(ncn-m001#) Set variables as comma-separated lists for the three types of management NCNs.
MASTERS="ncn-m002,ncn-m003"; echo MASTERS=$MASTERS
STORAGE=$(ceph orch host ls | grep ncn-s | awk '{print $1}' | xargs | sed 's/ /,/g'); echo STORAGE=$STORAGE
WORKERS=$(kubectl get nodes | grep ncn-w | awk '{print $1}' | sort -u | xargs | sed 's/ /,/g'); echo WORKERS=$WORKERS
(ncn-m001#) Install tools that will help to find processes preventing filesystem unmounting.
The psmisc rpm includes these tools: fuser, killall, peekfd, prtstat, pslog, pstree.
pdsh -w ncn-m001,$MASTERS,$WORKERS 'zypper -n install psmisc'
If the worker nodes have been supporting the containerized User Access Instance (UAI) pods, then the DVS mounted Cray Programming Environment (CPE) filesystems should be unmounted.
(ncn-m001#) Unmount the CPE content on the worker nodes.
pdsh -w $WORKERS bash /etc/cray-pe.d/pe_cleanup.sh | dshbak -c
(ncn-m001#) Shut down platform services.
NOTE: There are some interactive questions which need answers before the shutdown process can progress.
sat bootsys shutdown --stage platform-services
Example output:
Proceed with stopping platform services? [yes,no] yes
Proceeding with stopping platform services.
The following Non-compute Nodes (NCNs) will be included in this operation:
managers:
- ncn-m001
- ncn-m002
- ncn-m003
storage:
- ncn-s001
- ncn-s002
- ncn-s003
workers:
- ncn-w001
- ncn-w002
- ncn-w003
Are the above NCN groupings correct? [yes,no] yes
Executing step: Create etcd snapshot on all Kubernetes manager NCNs.
Executing step: Stop etcd on all Kubernetes manager NCNs.
Executing step: Stop and disable kubelet on all Kubernetes NCNs.
Executing step: Stop containers running under containerd on all Kubernetes NCNs.
WARNING: One or more "crictl stop" commands timed out on ncn-w003
WARNING: One or more "crictl stop" commands timed out on ncn-w002
ERROR: Failed to stop 1 container(s) on ncn-w003. Execute "crictl ps -q" on the host to view running containers.
ERROR: Failed to stop 2 container(s) on ncn-w002. Execute "crictl ps -q" on the host to view running containers.
WARNING: One or more "crictl stop" commands timed out on ncn-w001
ERROR: Failed to stop 4 container(s) on ncn-w001. Execute "crictl ps -q" on the host to view running containers.
WARNING: Non-fatal error in step "Stop containers running under containerd on all Kubernetes NCNs." of platform services stop: Failed to stop containers on the following NCN(s): ncn-w001, ncn-w002, ncn-w003
Continue with platform services stop? [yes,no] no
Aborting.
In the preceding example, the commands to stop containers timed out on all the worker nodes and reported WARNING and ERROR messages.
A summary of the issue displays and prompts the user to continue or stop. Respond no to stop the shutdown. Then review the containers running on the nodes.
for ncn in $(echo $WORKERS | sed 's/,/ /g'); do echo "${ncn}"; ssh "${ncn}" "crictl ps"; echo; done
Example output:
ncn-w001
CONTAINER IMAGE CREATED STATE NAME ATTEMPT POD ID
032d69162ad24 302d9780da639 54 minutes ago Running cray-dhcp-kea 0 e4d1c01818a5a
7ab8021279164 2ad3f16035f1f 3 hours ago Running log-forwarding 0 a5e89a366f5a3
ncn-w002
CONTAINER IMAGE CREATED STATE NAME ATTEMPT POD ID
1ca9d9fb81829 de444b360808f 4 hours ago Running cray-uas-mgr 0 902287a6d0393
ncn-w003
CONTAINER IMAGE CREATED STATE NAME ATTEMPT POD ID
Run the sat command again and enter yes at the prompt about the etcd snapshot not being created:
sat bootsys shutdown --stage platform-services
Example output:
The following Non-compute Nodes (NCNs) will be included in this operation:
managers:
- ncn-m001
- ncn-m002
- ncn-m003
storage:
- ncn-s001
- ncn-s002
- ncn-s003
workers:
- ncn-w001
- ncn-w002
- ncn-w003
Are the above NCN groupings correct? [yes,no] yes
Executing step: Create etcd snapshot on all Kubernetes manager NCNs.
WARNING: Failed to create etcd snapshot on ncn-m001: The etcd service is not active on ncn-m001 so a snapshot cannot be created.
WARNING: Failed to create etcd snapshot on ncn-m002: The etcd service is not active on ncn-m002 so a snapshot cannot be created.
WARNING: Failed to create etcd snapshot on ncn-m003: The etcd service is not active on ncn-m003 so a snapshot cannot be created.
WARNING: Non-fatal error in step "Create etcd snapshot on all Kubernetes manager NCNs." of platform services stop: Failed to create etcd snapshot on hosts: ncn-m001, ncn-m002, ncn-m003
Continue with platform services stop? [yes,no] yes
Continuing.
Executing step: Stop etcd on all Kubernetes manager NCNs.
Executing step: Stop and disable kubelet on all Kubernetes NCNs.
Executing step: Stop containers running under containerd on all Kubernetes NCNs.
Executing step: Stop containerd on all Kubernetes NCNs.
Executing step: Check health of Ceph cluster and freeze state.
If the process continues to report errors due to Failed to stop containers, then iterate on the above step. Each iteration should reduce the number of containers running. If necessary,
containers can be manually stopped using crictl stop CONTAINER. If containers are stopped manually, then re-run the above procedure to complete any final steps in the process.
(ncn-m001#) Unload DVS and Lnet kernel modules from worker nodes.
This step helps to avoid error messages in the console log while Linux is shutting down similar to “DVS: task XXX exiting on a signal”
pdsh -w $WORKERS 'lsmod | egrep "^dvs\s+"; rm -rf /run/dvs; \
echo quiesce / > /sys/fs/dvs/quiesce; modprobe -r dvs; sleep 5; \
modprobe -r dvsipc dvsipc_lnet dvsproc; lsmod | egrep "^lnet\s"; \
lsmod | egrep "^lustre\s"; systemctl stop lnet; lsmod | egrep "^lnet\s"'
(ncn-m001#) Adjust boot order for management NCNs so the next boot will use disk.
This ensures that when the node is powered up again it will boot from disk rather than attempting
to PXE boot before the services to support that are available.
pdsh -w ncn-m001,$MASTERS,$STORAGE,$WORKERS 'efibootmgr -n $(efibootmgr | grep "UEFI OS" | head -1 | cut -c 5-8)' | dshbak -c
(ncn-m001#) Unmount ceph and fuse.s3fs filesystems from master and worker nodes.
pdsh -w ncn-m001,$MASTERS,$WORKERS 'mount -t ceph|egrep -v kubelet; umount /etc/cray/upgrade/csm' | dshbak -c
pdsh -w ncn-m001,$MASTERS 'mount -t fuse.s3fs |egrep -v kubelet; umount /var/opt/cray/sdu/collection-mount; umount /var/opt/cray/config-data' | dshbak -c
pdsh -w $WORKERS 'mount -t fuse.s3fs ; fusermount -u /var/lib/cps-local/boot-images; umount /var/lib/cps-local/boot-images; pkill s3fs' | dshbak -c
(ncn-m001#) Shut down and power off all management NCNs except ncn-m001.
This command requires input for the IPMI username and password for the management nodes.
Important: The default timeout for the sat bootsys shutdown --stage ncn-power command is 300 seconds. If it is known that
the nodes take longer than this amount of time for a graceful shutdown, then a different value
can be set using --ncn-shutdown-timeout NCN_SHUTDOWN_TIMEOUT with a value other than 300
for NCN_SHUTDOWN_TIMEOUT. Once this timeout has been exceeded, the node will be forcefully
powered down.
Shutdown management NCNs.
NOTE: There are some interactive questions which need answers before the shutdown process can progress.
sat bootsys shutdown --stage ncn-power --ncn-shutdown-timeout 1200
Example output:
Proceed with shutdown of other management NCNs? [yes,no] yes
Proceeding with shutdown of other management NCNs.
IPMI username: root
IPMI password:
The following Non-compute Nodes (NCNs) will be included in this operation:
managers:
- ncn-m002
- ncn-m003
storage:
- ncn-s001
- ncn-s002
- ncn-s003
workers:
- ncn-w001
- ncn-w002
- ncn-w003
The following Non-compute Nodes (NCNs) will be excluded from this operation:
managers:
- ncn-m001
storage: []
workers: []
Are the above NCN groupings and exclusions correct? [yes,no] yes
(ncn-m001#) Monitor the consoles for each NCN.
Use tail to monitor the log files in /var/log/cray/console_logs for each NCN.
Alternately attach to the screen session (screen sessions real time, but not saved):
screen -ls
Example output:
There are screens on:
26745.SAT-console-ncn-m003-mgmt (Detached)
26706.SAT-console-ncn-m002-mgmt (Detached)
26666.SAT-console-ncn-s003-mgmt (Detached)
26627.SAT-console-ncn-s002-mgmt (Detached)
26589.SAT-console-ncn-s001-mgmt (Detached)
26552.SAT-console-ncn-w003-mgmt (Detached)
26514.SAT-console-ncn-w002-mgmt (Detached)
26444.SAT-console-ncn-w001-mgmt (Detached)
screen -x 26745.SAT-console-ncn-w003-mgmt
NOTE: There may be many messages like this in the console logs for worker nodes and master nodes. There are no special actions to address these errors.
Example console log output:
[76266.056108][T2394731] libceph: connect (1)100.96.129.14:6789 error -101
(ncn-m001#) Check the power off status of management NCNs.
NOTE:
read -sis used to read the password in order to prevent it from being echoed to the screen or preserved in the shell history.
USERNAME=root
read -r -s -p "NCN BMC ${USERNAME} password: " IPMI_PASSWORD
export IPMI_PASSWORD
for ncn in $(echo "$MASTERS,$STORAGE,$WORKERS" | sed 's/,/ /g'); do
echo -n "${ncn}: "
ipmitool -U "${USERNAME}" -H "${ncn}-mgmt" -E -I lanplus chassis power status
done
(external#) From a remote system, activate the serial console for ncn-m001.
USERNAME=root
read -r -s -p "NCN BMC ${USERNAME} password: " IPMI_PASSWORD
export IPMI_PASSWORD
ipmitool -I lanplus -U "${USERNAME}" -E -H NCN-M001_BMC_HOSTNAME sol activate
(ncn-m001#) From the serial console of ncn-m001, shut down Linux.
shutdown -h now
Wait until the console indicates that the node has shut down.
(external#) From a remote system that has access to the management plane, power off ncn-m001.
ipmitool -I lanplus -U "${USERNAME}" -E -H NCN-M001_BMC_HOSTNAME chassis power status
ipmitool -I lanplus -U "${USERNAME}" -E -H NCN-M001_BMC_HOSTNAME chassis power off
ipmitool -I lanplus -U "${USERNAME}" -E -H NCN-M001_BMC_HOSTNAME chassis power status
(Optional) Power down Modular coolant distribution unit (MDCU) in a liquid-cooled HPE Cray EX20000 cabinet.
CAUTION: The modular coolant distribution unit (MDCU) in a liquid-cooled HPE Cray EX2000 cabinet (also referred to as a Hill or TDS cabinet) typically receives power from its management cabinet PDUs. If the system includes an EX2000 cabinet, then do not power off the management cabinet PDUs. Powering off the MDCU will cause an emergency power off (EPO) of the cabinet and may result in data loss or equipment damage.
Return to System Power Off Procedures and continue with next step.