OpenShift の様々な操作で使用する oc コマンドにおいて、node 関連で思いのほか面倒と思われるものを、使用例としてご紹介します。
Sort
Sort by node-role
$ oc get node --sort-by='.metadata.labels.node-role\.kubernetes\.io/worker'
NAME STATUS ROLES AGE VERSION
ip-99-888-77-45.us-eastwest-10.machine.external Ready control-plane,master 5d19h v1.29.8+f10c92d
ip-99-888-77-82.us-eastwest-10.machine.external Ready control-plane,master 5d19h v1.29.8+f10c92d
ip-99-888-77-40.us-eastwest-10.machine.external Ready control-plane,master 5d19h v1.29.8+f10c92d
ip-99-888-77-16.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-50.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-102.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-19.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-118.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-41.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-42.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-116.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-49.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-122.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-55.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-71.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-72.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-78.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-113.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-93.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-94.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-99.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
$ oc get node --sort-by='.metadata.labels.node-role\.kubernetes\.io/control-plane'
NAME STATUS ROLES AGE VERSION
ip-99-888-77-49.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-94.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-19.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-78.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-93.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-55.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-72.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-122.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-113.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-116.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-99.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-50.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-71.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-42.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-102.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-118.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-41.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-16.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-82.us-eastwest-10.machine.external Ready control-plane,master 5d19h v1.29.8+f10c92d
ip-99-888-77-45.us-eastwest-10.machine.external Ready control-plane,master 5d19h v1.29.8+f10c92d
ip-99-888-77-40.us-eastwest-10.machine.external Ready control-plane,master 5d19h v1.29.8+f10c92d
Sort by node IP address
$ oc get node --sort-by=.status.addresses[0].address
NAME STATUS ROLES AGE VERSION
ip-99-888-77-16.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-19.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-40.us-eastwest-10.machine.external Ready control-plane,master 5d19h v1.29.8+f10c92d
ip-99-888-77-41.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-42.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-45.us-eastwest-10.machine.external Ready control-plane,master 5d19h v1.29.8+f10c92d
ip-99-888-77-49.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-50.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-55.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-71.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-72.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-78.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-82.us-eastwest-10.machine.external Ready control-plane,master 5d19h v1.29.8+f10c92d
ip-99-888-77-93.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-94.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-99.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-102.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-113.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-116.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
ip-99-888-77-118.us-eastwest-10.machine.external Ready infra,worker 20h v1.29.8+f10c92d
ip-99-888-77-122.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
Label
Add node label
$ oc label node ip-99-888-77-122.us-eastwest-10.machine.external my-label.private/label1="true"
node/ip-99-888-77-122.us-eastwest-10.machine.external labeled
Show labeled nodes
$ oc get node -l my-label.private/label1
NAME STATUS ROLES AGE VERSION
ip-99-888-77-122.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
$ oc get node -l my-label.private/label1="true"
NAME STATUS ROLES AGE VERSION
ip-99-888-77-122.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
$ oc get node -l my-label.private/label1=true
NAME STATUS ROLES AGE VERSION
ip-99-888-77-122.us-eastwest-10.machine.external Ready worker 5d19h v1.29.8+f10c92d
$ oc get node -l my-label.private/label1=false
No resources found
Show all node labels
$ oc -o json get node | jq -r '.items[].metadata.labels | keys[]' | sort | uniq
beta.kubernetes.io/arch
beta.kubernetes.io/instance-type
beta.kubernetes.io/os
failure-domain.beta.kubernetes.io/region
failure-domain.beta.kubernetes.io/zone
kubernetes.io/arch
kubernetes.io/hostname
kubernetes.io/os
node.kubernetes.io/instance-type
node.openshift.io/os_id
node-role.kubernetes.io/control-plane
node-role.kubernetes.io/master
node-role.kubernetes.io/worker
topology.abc.123.xyz.com/zone
topology.kubernetes.io/region
topology.kubernetes.io/zone
$ for V in $(oc -o json get node | jq -r '.items[].metadata.labels | keys[]' | sort | uniq)
do
O=$O" -L $V "
done
$ oc get node $O
NAME STATUS ROLES AGE VERSION ARCH INSTANCE-TYPE OS REGION ZONE ARCH HOSTNAME OS INSTANCE-TYPE OS_ID CONTROL-PLANE MASTER WORKER ZONE REGION ZONE
ip-99-888-77-102.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-102.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-113.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-113.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-116.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-116.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-122.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-122.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-16.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-16.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-40.us-eastwest-10.machine.external Ready control-plane,master 4d22h v1.29.8+f10c92d amd64 c6i.8xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-40.us-eastwest-10.machine.external linux c6i.8xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-41.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-41.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-42.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-42.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-45.us-eastwest-10.machine.external Ready control-plane,master 4d22h v1.29.8+f10c92d amd64 c6i.8xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-45.us-eastwest-10.machine.external linux c6i.8xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-49.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-49.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-50.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-50.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-55.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-55.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-71.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-71.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-82.us-eastwest-10.machine.external Ready control-plane,master 4d22h v1.29.8+f10c92d amd64 c6i.8xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-82.us-eastwest-10.machine.external linux c6i.8xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
ip-99-888-77-93.us-eastwest-10.machine.external Ready worker 4d22h v1.29.8+f10c92d amd64 r5.16xyzbig linux us-eastwest-10 us-eastwest-10z amd64 ip-99-888-77-93.us-eastwest-10.machine.external linux r5.16xyzbig rhcos us-eastwest-10z us-eastwest-10 us-eastwest-10z
Remove node label
$ oc label node ip-99-888-77-122.us-eastwest-10.machine.external my-label.private/label1-
node/ip-99-888-77-122.us-eastwest-10.machine.external unlabeled
$ oc get node -l my-label.private/label1
No resources found
Taint
Add node taint
$ oc adm taint node ip-99-888-77-122.us-eastwest-10.machine.external my-taint.private/taint1="true":NoSchedule
node/ip-99-888-77-122.us-eastwest-10.machine.external tainted
Show node taints
$ oc get node ip-99-888-77-122.us-eastwest-10.machine.external -o jsonpath='{.spec.taints[]}{"\n"}'
[{"effect":"NoSchedule","key":"my-taint.private/taint1","value":"true"}]
Show all node taints
$ oc get node -o jsonpath='{range @.items[*]}{.metadata.name}{.spec.taints[*]}{"\n"}'
ip-99-888-77-102.us-eastwest-10.machine.external
ip-99-888-77-113.us-eastwest-10.machine.external
ip-99-888-77-116.us-eastwest-10.machine.external
ip-99-888-77-118.us-eastwest-10.machine.external
ip-99-888-77-122.us-eastwest-10.machine.external{"effect":"NoSchedule","key":"my-taint.private/taint1","value":"true"}
ip-99-888-77-16.us-eastwest-10.machine.external
ip-99-888-77-19.us-eastwest-10.machine.external
ip-99-888-77-40.us-eastwest-10.machine.external{"effect":"NoSchedule","key":"node-role.kubernetes.io/master"}
ip-99-888-77-41.us-eastwest-10.machine.external
ip-99-888-77-42.us-eastwest-10.machine.external
ip-99-888-77-45.us-eastwest-10.machine.external{"effect":"NoSchedule","key":"node-role.kubernetes.io/master"}
ip-99-888-77-49.us-eastwest-10.machine.external
ip-99-888-77-50.us-eastwest-10.machine.external
ip-99-888-77-55.us-eastwest-10.machine.external
ip-99-888-77-71.us-eastwest-10.machine.external
ip-99-888-77-72.us-eastwest-10.machine.external
ip-99-888-77-78.us-eastwest-10.machine.external
ip-99-888-77-82.us-eastwest-10.machine.external{"effect":"NoSchedule","key":"node-role.kubernetes.io/master"}
ip-99-888-77-93.us-eastwest-10.machine.external
ip-99-888-77-94.us-eastwest-10.machine.external
ip-99-888-77-99.us-eastwest-10.machine.external
$ oc get node -o custom-columns=NAME:.metadata.name,TAINTS:.spec.taints
NAME TAINTS
ip-99-888-77-102.us-eastwest-10.machine.external <none>
ip-99-888-77-113.us-eastwest-10.machine.external <none>
ip-99-888-77-116.us-eastwest-10.machine.external <none>
ip-99-888-77-122.us-eastwest-10.machine.external [map[effect:NoSchedule key:my-taint.private/taint1 value:true]]
ip-99-888-77-16.us-eastwest-10.machine.external <none>
ip-99-888-77-40.us-eastwest-10.machine.external [map[effect:NoSchedule key:node-role.kubernetes.io/master]]
ip-99-888-77-41.us-eastwest-10.machine.external <none>
ip-99-888-77-42.us-eastwest-10.machine.external <none>
ip-99-888-77-45.us-eastwest-10.machine.external [map[effect:NoSchedule key:node-role.kubernetes.io/master]]
ip-99-888-77-49.us-eastwest-10.machine.external <none>
ip-99-888-77-50.us-eastwest-10.machine.external <none>
ip-99-888-77-55.us-eastwest-10.machine.external <none>
ip-99-888-77-71.us-eastwest-10.machine.external <none>
ip-99-888-77-82.us-eastwest-10.machine.external [map[effect:NoSchedule key:node-role.kubernetes.io/master]]
ip-99-888-77-93.us-eastwest-10.machine.external <none>
Remove node taint
$ oc adm taint node ip-99-888-77-122.us-eastwest-10.machine.external my-taint.private/taint1="true":NoSchedule-
node/ip-99-888-77-122.us-eastwest-10.machine.external untainted
$ oc get node ip-99-888-77-122.us-eastwest-10.machine.external -o jsonpath='{.spec.taints[]}{"\n"}'