Kubernetes theory
September 16, 2022
Node
Это физический уровень кластера k8s. Непосредственно сами ноды кластера. Ноды кластера бывают двух типов: master node, worker node.
Именно на нодах кластера расположены все его ресурсы: pod, deploy, ns, ds, sts, sc, cj, etc.
Далее под определением нод кластера будем использовать понятие воркер ноды.
Посмотрим текущие ноды в кластере:
kubectl get no NAME STATUS ROLES AGE VERSION cl1r12kvg8q3mf91ohla-ipir Ready <none> 24d v1.21.5 cl1r12kvg8q3mf91ohla-usen Ready <none> 100d v1.21.5
Отсюда можно понять какая версия кластера, минорная версия, сколько нода уже работает и её статус.
Посмотрим теперь описание ноды:
kubectl describe no cl1r12kvg8q3mf91ohla-ipir
Name: cl1r12kvg8q3mf91ohla-ipir
Roles: <none>
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/instance-type=standard-v3
beta.kubernetes.io/os=linux
failure-domain.beta.kubernetes.io/zone=ru-central1-a
kubernetes.io/arch=amd64
kubernetes.io/hostname=cl1r12kvg8q3mf91ohla-ipir
kubernetes.io/os=linux
node.kubernetes.io/instance-type=standard-v3
node.kubernetes.io/kube-proxy-ds-ready=true
node.kubernetes.io/masq-agent-ds-ready=true
node.kubernetes.io/node-problem-detector-ds-ready=true
topology.kubernetes.io/zone=ru-central1-a
yandex.cloud/node-group-id=cat65rfc3mb4n7440l93
yandex.cloud/pci-topology=k8s
yandex.cloud/preemptible=false
Annotations: csi.volume.kubernetes.io/nodeid:
{"disk-csi-driver.mks.ycloud.io":"fhmiqvsbb2ef1c7f0g24","io.ycloud.mks.disk-csi-driver":"fhmiqvsbb2ef1c7f0g24","ru.yandex.s3.csi":"cl1r12k...
node.alpha.kubernetes.io/ttl: 0
volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp: Sun, 21 Aug 2022 22:27:49 +0300
Taints: <none>
Unschedulable: false
Lease:
HolderIdentity: cl1r12kvg8q3mf91ohla-ipir
AcquireTime: <unset>
RenewTime: Thu, 15 Sep 2022 22:24:52 +0300
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
ReadonlyFilesystem False Thu, 15 Sep 2022 22:23:38 +0300 Sun, 21 Aug 2022 22:28:25 +0300 FilesystemIsNotReadOnly Filesystem is not read-only
FrequentUnregisterNetDevice Unknown Thu, 15 Sep 2022 22:23:38 +0300 Sun, 21 Aug 2022 22:28:27 +0300 NoFrequentUnregisterNetDevice node is functioning properly
FrequentKubeletRestart Unknown Thu, 15 Sep 2022 22:23:38 +0300 Sun, 21 Aug 2022 22:28:27 +0300 NoFrequentKubeletRestart kubelet is functioning properly
FrequentDockerRestart Unknown Thu, 15 Sep 2022 22:23:38 +0300 Sun, 21 Aug 2022 22:28:27 +0300 NoFrequentDockerRestart docker is functioning properly
FrequentContainerdRestart Unknown Thu, 15 Sep 2022 22:23:38 +0300 Sun, 21 Aug 2022 22:28:27 +0300 NoFrequentContainerdRestart containerd is functioning properly
CorruptDockerOverlay2 Unknown Thu, 15 Sep 2022 22:23:38 +0300 Sun, 21 Aug 2022 22:28:27 +0300 NoCorruptDockerOverlay2 docker overlay2 is functioning properly
KernelDeadlock False Thu, 15 Sep 2022 22:23:38 +0300 Sun, 21 Aug 2022 22:28:25 +0300 KernelHasNoDeadlock kernel has no deadlock
NetworkUnavailable False Sun, 21 Aug 2022 22:27:56 +0300 Sun, 21 Aug 2022 22:27:56 +0300 RouteCreated RouteController created a route
MemoryPressure False Thu, 15 Sep 2022 22:24:16 +0300 Sun, 21 Aug 2022 22:27:49 +0300 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Thu, 15 Sep 2022 22:24:16 +0300 Sun, 21 Aug 2022 22:27:49 +0300 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Thu, 15 Sep 2022 22:24:16 +0300 Sun, 21 Aug 2022 22:27:49 +0300 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Thu, 15 Sep 2022 22:24:16 +0300 Sun, 21 Aug 2022 22:28:09 +0300 KubeletReady kubelet is posting ready status. AppArmor enabled
Addresses:
InternalIP: 10.128.0.19
ExternalIP: 62.84.118.73
Hostname: cl1r12kvg8q3mf91ohla-ipir
Capacity:
cpu: 8
ephemeral-storage: 99052768Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 16392476Ki
pods: 110
Allocatable:
cpu: 7910m
ephemeral-storage: 49411099702
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 13461788Ki
pods: 110
System Info:
Machine ID: 230000073c64422ef5268ddf78120c41
System UUID: 23000007-c6d2-d7f8-b589-cf0b0ef04044
Boot ID: d196ac43-592f-460f-825a-d299f854790d
Kernel Version: 5.4.0-100-generic
OS Image: Ubuntu 20.04.4 LTS
Operating System: linux
Architecture: amd64
Container Runtime Version: containerd://1.4.12
Kubelet Version: v1.21.5
Kube-Proxy Version: v1.21.5
PodCIDR: 10.96.130.0/25
PodCIDRs: 10.96.130.0/25
ProviderID: yandex://fhmiqvsbb2ef1c7f0g24
Non-terminated Pods: (22 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits Age
--------- ---- ------------ ---------- --------------- ------------- ---
default jenkins-745957694b-9tphc 500m (6%) 500m (6%) 500Mi (3%) 500Mi (3%) 24d
default vault-yckms-k8s-0 500m (6%) 500m (6%) 500Mi (3%) 500Mi (3%) 24d
default vault-yckms-k8s-agent-injector-56b47d8b66-xdtrv 500m (6%) 500m (6%) 500Mi (3%) 500Mi (3%) 24d
external-secrets external-secrets-66674f9d4f-4v276 0 (0%) 0 (0%) 0 (0%) 0 (0%) 24d
external-secrets external-secrets-cert-controller-f9cbddcb6-67brp 0 (0%) 0 (0%) 0 (0%) 0 (0%) 24d
external-secrets external-secrets-webhook-6b6c54f77-plj6m 0 (0%) 0 (0%) 0 (0%) 0 (0%) 24d
kube-system calico-node-q8qk6 250m (3%) 0 (0%) 0 (0%) 0 (0%) 24d
kube-system calico-typha-6d7bddfb44-gmmtk 200m (2%) 0 (0%) 0 (0%) 0 (0%) 24d
kube-system calico-typha-horizontal-autoscaler-8495b957fc-cg784 10m (0%) 500m (6%) 0 (0%) 0 (0%) 24d
kube-system calico-typha-vertical-autoscaler-6cc57f94f4-rlxx2 0 (0%) 0 (0%) 0 (0%) 0 (0%) 24d
kube-system coredns-5f8dbbff8f-57ppg 100m (1%) 0 (0%) 70Mi (0%) 170Mi (1%) 24d
kube-system coredns-5f8dbbff8f-mptx9 100m (1%) 0 (0%) 70Mi (0%) 170Mi (1%) 24d
kube-system csi-s3-lbc7p 0 (0%) 0 (0%) 0 (0%) 0 (0%) 28h
kube-system ip-masq-agent-wjbrp 10m (0%) 0 (0%) 16Mi (0%) 0 (0%) 24d
kube-system kube-dns-autoscaler-598db8ff9c-k74zw 20m (0%) 0 (0%) 10Mi (0%) 0 (0%) 24d
kube-system kube-proxy-h6c46 100m (1%) 0 (0%) 0 (0%) 0 (0%) 24d
kube-system metrics-server-v0.3.1-6b998b66d6-9vvdr 69m (0%) 164m (2%) 202Mi (1%) 452Mi (3%) 24d
kube-system node-local-dns-8gj2l 30m (0%) 0 (0%) 50Mi (0%) 0 (0%) 24d
kube-system npd-v0.8.0-9sn7d 20m (0%) 200m (2%) 20Mi (0%) 100Mi (0%) 24d
kube-system yc-disk-csi-node-v2-pf9sh 30m (0%) 600m (7%) 96Mi (0%) 600Mi (4%) 24d
local-path-storage local-path-provisioner-849cb58dff-xkd4d 0 (0%) 0 (0%) 0 (0%) 0 (0%) 24d
logging fluent-bit-79vh7 0 (0%) 0 (0%) 0 (0%) 0 (0%) 4d8h
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 2439m (30%) 2964m (37%)
memory 2034Mi (15%) 2992Mi (22%)
ephemeral-storage 0 (0%) 0 (0%)
hugepages-1Gi 0 (0%) 0 (0%)
hugepages-2Mi 0 (0%) 0 (0%)
Events:Здесь много разной полезной информации.
В блоке Addresses: - ip адреса и имя ноды.
Capacity: - здесь указывается сколько выделено ресурсов ноде
Allocatable: - здесь сколько реально ресурсов в распоряжении ноды
System Info: - системная информация о ноде. В частности какой используется рантайм. И версия кластера.
Non-terminated Pods: - какие поды находятся на данной ноде.
Полезные ссылки.
September 16, 2022, 21:21
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