Use this procedure to clear the etcd cluster NOSPACE alarm. Once it is set it will remain set. If needed, defrag the database cluster before clearing the NOSPACE alarm.
Defragging the database cluster and clearing the etcd cluster NOSPACE alarm will free up database space.
Clear up space when the etcd database space has exceeded and has been defragged, but the NOSPACE alarm remains set.
Verify that the attempt to store a new key-value fails.
Replace hbtd-ETCD_CLUSTER before running the following command.
hbtd-etcd-h59j42knjv is an example replacement value.
ncn-mw# kubectl -n services exec -it hbtd-ETCD_CLUSTER -c etcd -- /bin/sh -c "ETCDCTL_API=3 etcdctl put foo bar"
Example output:
{"level":"warn","ts":"2020-10-23T23:56:48.408Z","caller":"clientv3/retry_interceptor.go:62","msg":"retrying of unary invoker failed","target":"endpoint://client-208534eb-2ab4-4c58-8853-58bff088c394/127.0.0.1:2379","attempt":0,"error":"rpc error: code = ResourceExhausted desc = etcdserver: mvcc: database space exceeded"}
Error: etcdserver: mvcc: database space exceeded
Check to see if the default 2G disk usage space (unless defined differently in the Helm chart) is currently exceeded.
In the following example, the disk usage is 375.5 M, which means the disk space has not been exceeded.
Replace hbtd-ETCD_CLUSTER before running the following command.
hbtd-etcd-h59j42knjv is an example replacement value.
ncn-mw# kubectl -n services exec -it hbtd-ETCD_CLUSTER -c etcd -- df -h
Example output:
Filesystem Size Used Available Use% Mounted on
overlay 396.3G 59.6G 316.5G 16% /
tmpfs 64.0M 0 64.0M 0% /dev
tmpfs 125.7G 0 125.7G 0% /sys/fs/cgroup
/dev/rbd21 2.9G 375.5M 2.5G 13% /var/etcd. <------/dev/sdc4 396.3G 22.0G 354.1G 6% /etc/hosts
/dev/sdc4 396.3G 22.0G 354.1G 6% /dev/termination-log
/dev/sdc5 396.3G 59.6G 316.5G 16% /etc/hostname
/dev/sdc5 396.3G 59.6G 316.5G 16% /etc/resolv.conf
Clear the NOSPACE alarm.
ncn-mw# for pod in $(kubectl get pods -l etcd_cluster=hbtd-etcd \
-n services -o jsonpath='{.items[*].metadata.name}')
do
echo "### ${pod} ###"
kubectl -n services exec ${pod} -- /bin/sh \
-c "ETCDCTL_API=3 etcdctl alarm disarm"
done
Example output:
### hbtd-etcd-h59j42knjv ###
memberID:6004340417806974740 alarm:NOSPACE
memberID:10618826089438871005 alarm:NOSPACE
memberID:6927946043724325475 alarm:NOSPACE
### hbtd-etcd-jfwh9l49lm ###
### hbtd-etcd-mhklm4n5qd ###
Verify that a new key-value can now be successfully stored.
Replace hbtd-ETCD_CLUSTER before running the following command.
hbtd-etcd-h59j42knjv is an example replacement value.
ncn-mw# kubectl -n services exec -it hbtd-ETCD_CLUSTER -c etcd -- /bin/sh -c "ETCDCTL_API=3 etcdctl put foo bar"
Example output:
OK
Clear the NOSPACE alarm. If the database needs to be defragged, then the alarm will be reset.
Confirm that the “database space exceeded” message is present.
ncn-mw# kubectl logs -n services --tail=-1 --prefix=true -l "app.kubernetes.io/name=cray-hbtd" -c cray-hbtd | grep "x3005c0s19b1n0"
Example output:
[pod/cray-hbtd-56bc4f6fdb-92bqx/cray-hbtd] 2020/09/15 20:00:44 INTERNAL ERROR storing key {"Component":"x3005c0s19b1n0","Last_hb_rcv_time":"5f611d6c","Last_hb_timestamp":"2020-09-15T15:00:44.878876-06:00","Last_hb_status":"OK","Had_warning":""} : etcdserver: mvcc: database space exceeded
[pod/cray-hbtd-56bc4f6fdb-92bqx/cray-hbtd] 2020/09/15 20:00:47 INTERNAL ERROR storing key {"Component":"x3005c0s19b1n0","Last_hb_rcv_time":"5f611d6f","Last_hb_timestamp":"2020-09-15T15:00:47.893757-06:00","Last_hb_status":"OK","Had_warning":""} : etcdserver: mvcc: database space exceeded
[pod/cray-hbtd-56bc4f6fdb-92bqx/cray-hbtd] 2020/09/15 20:00:53 INTERNAL ERROR storing key {"Component":"x3005c0s19b1n0","Last_hb_rcv_time":"5f611d75","Last_hb_timestamp":"2020-09-15T15:00:53.926195-06:00","Last_hb_status":"OK","Had_warning":""} : etcdserver: mvcc: database space exceeded
[pod/cray-hbtd-56bc4f6fdb-92bqx/cray-hbtd] 2020/09/15 20:01:02 INTERNAL ERROR storing key {"Component":"x3005c0s19b1n0","Last_hb_rcv_time":"5f611d7e","Last_hb_timestamp":"2020-09-15T15:01:02.970168-06:00","Last_hb_status":"OK","Had_warning":""} : etcdserver: mvcc: database space exceeded
[pod/cray-hbtd-56bc4f6fdb-92bqx/cray-hbtd] 2020/09/15 20:01:05 INTERNAL ERROR storing key {"Component":"x3005c0s19b1n0","Last_hb_rcv_time":"5f611d81","Last_hb_timestamp":"2020-09-15T15:01:05.983828-06:00","Last_hb_status":"OK","Had_warning":""} : etcdserver: mvcc: database space exceeded
Check if the default 2G (unless defined differently in the Helm chart) disk usage has been exceeded.
Replace ETCD_CLUSTER_NAME before running the following command.
For example, cray-hbtd-etcd-6p4tc4jdgm could be used.
ncn-mw# kubectl exec -it -n services ETCD_CLUSTER_NAME -c etcd -- df -h
Example output:
Filesystem Size Used Available Use% Mounted on
overlay 439.1G 15.2G 401.5G 4% /
tmpfs 64.0M 0 64.0M 0% /dev
tmpfs 125.7G 0 125.7G 0% /sys/fs/cgroup
/dev/rbd3 7.8G 2.4G 5.4G 31% /var/etcd
Resolve the space issue by either increasing the frequency of how often the etcd-defrag cron job is run, or by triggering it manually.
Select one of the following options:
Increase the frequency of the kube-etcd-defrag from every 24 hours to 12 hours.
ncn-mw# kubectl edit -n operators cronjob.batch/kube-etcd-defrag
Example output:
[...]
name: etcd-defrag
name: etcd-defrag
schedule: 0 */12 * * *
successfulJobsHistoryLimit: 1
suspend: false
status:
...
...
Trigger the job manually.
ncn-mw# kubectl -n operators create job --from=cronjob/kube-etcd-defrag kube-etcd-defrag
Check the log messages after the defrag job is triggered.
ncn-mw# kubectl logs -f -n operators pod/kube-etcd-defrag-1600171200-fxpn7
Example output:
Defragging cray-bos-etcd-j7czpr9pbr
Defragging cray-bos-etcd-k4qtjtgqjb
Defragging cray-bos-etcd-wcm8cs7dvc
Defragging cray-bss-etcd-2h6k4l4j2g
Defragging cray-bss-etcd-5dqwvrdtnf
Defragging cray-bss-etcd-zlwmzkcjhz
Defragging cray-cps-etcd-6cqw8sw5k6
Defragging cray-cps-etcd-psjm9lpw66
Defragging cray-cps-etcd-rp6fp94ccv
Defragging cray-crus-etcd-228mdpm2h6
Defragging cray-crus-etcd-hldtxr6f9s
Defragging cray-crus-etcd-sfsckpv4vw
Defragging cray-externaldns-etcd-6l772b2cdv
Defragging cray-externaldns-etcd-khbgl45pf7
Defragging cray-externaldns-etcd-qphz6lmhns
Defragging cray-fas-etcd-7ktd4h47jv
Defragging cray-fas-etcd-b27mknzs2q
Defragging cray-fas-etcd-vccgfhcnnt
Defragging cray-hbtd-etcd-6p4tc4jdgm
Defragging cray-hbtd-etcd-j4xs7zj6v5
Defragging cray-hbtd-etcd-pb9tnrj6bw
Defragging cray-hmnfd-etcd-558sqc22lw
Defragging cray-hmnfd-etcd-prt7k224br
Defragging cray-hmnfd-etcd-rf2x7sth84
Defragging cray-reds-etcd-h94pq6w7cv
Defragging cray-reds-etcd-hgxdbgc65j
Defragging cray-reds-etcd-qxfh756zhm
Defragging cray-uas-mgr-etcd-5548zzfw8w
Defragging cray-uas-mgr-etcd-ngbm48qz2g
Defragging cray-uas-mgr-etcd-qnrlg6r4n6
Verify that the disk space is less than the size limit.
Replace ETCD_CLUSTER_NAME before running the following command.
For example, cray-hbtd-etcd-6p4tc4jdgm could be used.
ncn-mw# kubectl exec -it -n services ETCD_CLUSTER_NAME -c etcd -- df -h
Example output:
Filesystem Size Used Available Use% Mounted on
overlay 439.1G 15.2G 401.5G 4% /
tmpfs 64.0M 0 64.0M 0% /dev
tmpfs 125.7G 0 125.7G 0% /sys/fs/cgroup
/dev/rbd3 7.8G 403.0M 7.4G 5% /var/etcd.
Turn off the NOSPACE alarm.
Replace ETCD_CLUSTER_NAME before running the following command.
For example, cray-hbtd-etcd-6p4tc4jdgm could be used.
ncn-mw# kubectl exec -it -n services ETCD_CLUSTER_NAME -c etcd -- /bin/sh -c "ETCDCTL_API=3 etcdctl alarm disarm"
Example output:
memberID:14039380531903955557 alarm:NOSPACE
memberID:10060051157615504224 alarm:NOSPACE
memberID:9418794810465807950 alarm:NOSPACE