K8S基本命令
注： 这里的C# 代码都是虚拟机中的命令
这里我就讲六个。
# kubectl run：在集群中使用指定镜像启动容器
# kubectl get pods： 查看所有 Pod 列表
[root@master ~]# kubectl run nginx --image=192.168.200.23/library/nginx:1.14 pod/nginx created [root@master ~]# kubectl get pods NAME READY STATUS RESTARTS AGE nginx 1/1 Running 0 10s
看到 status是runing就是成功了
# kubectl get nodes查看所有的nodes列表
# kubectl get nodes master：查看master的具体信息
[root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master Ready master 21h v1.18.1 node Ready <none> 11h v1.18.1 [root@master ~]# kubectl get nodes master NAME STATUS ROLES AGE VERSION master Ready master 21h v1.18.1
]# kubectl describe nodes node：查看node的详细信息
[root@master ~]# kubectl describe nodes node
Name: master
Roles: master
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/arch=amd64
kubernetes.io/hostname=master
kubernetes.io/os=linux
node-role.kubernetes.io/master=
Annotations: flannel.alpha.coreos.com/backend-data: {"VtepMAC":"f6:84:53:17:f1:dd"}
flannel.alpha.coreos.com/backend-type: vxlan
flannel.alpha.coreos.com/kube-subnet-manager: true
flannel.alpha.coreos.com/public-ip: 192.168.200.23
kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock
node.alpha.kubernetes.io/ttl: 0
volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp: Thu, 03 Dec 2020 09:06:51 -0500
Taints: <none>
Unschedulable: false
Lease:
HolderIdentity: master
AcquireTime: <unset>
RenewTime: Fri, 04 Dec 2020 06:54:24 -0500
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
NetworkUnavailable False Thu, 03 Dec 2020 22:27:43 -0500 Thu, 03 Dec 2020 22:27:43 -0500 FlannelIsUp Flannel is running on this node
MemoryPressure False Fri, 04 Dec 2020 06:50:07 -0500 Thu, 03 Dec 2020 09:06:46 -0500 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Fri, 04 Dec 2020 06:50:07 -0500 Thu, 03 Dec 2020 09:06:46 -0500 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Fri, 04 Dec 2020 06:50:07 -0500 Thu, 03 Dec 2020 09:06:46 -0500 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Fri, 04 Dec 2020 06:50:07 -0500 Thu, 03 Dec 2020 09:07:52 -0500 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 192.168.200.23
Hostname: master
Capacity:
cpu: 2
ephemeral-storage: 55269Mi
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 2853904Ki
pods: 110
Allocatable:
cpu: 2
ephemeral-storage: 52158372164
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 2751504Ki
pods: 110
System Info:
Machine ID: 50a4f08e13da4bde88f2d602c7ba0461
System UUID: 290B4D56-7611-E667-5994-B3BF697C546F
Boot ID: ca7e49a2-77ab-466d-a762-9395c80044af
Kernel Version: 3.10.0-862.el7.x86_64
OS Image: CentOS Linux 7 (Core)
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://19.3.13
Kubelet Version: v1.18.1
Kube-Proxy Version: v1.18.1
PodCIDR: 10.244.0.0/24
PodCIDRs: 10.244.0.0/24
Non-terminated Pods: (10 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
kube-system coredns-5d4768dfd-5vllb 100m (5%) 0 (0%) 70Mi (2%) 170Mi (6%) 21h
kube-system coredns-5d4768dfd-lrzgx 100m (5%) 0 (0%) 70Mi (2%) 170Mi (6%) 21h
kube-system etcd-master 0 (0%) 0 (0%) 0 (0%) 0 (0%) 21h
kube-system kube-apiserver-master 250m (12%) 0 (0%) 0 (0%) 0 (0%) 21h
kube-system kube-controller-manager-master 200m (10%) 0 (0%) 0 (0%) 0 (0%) 21h
kube-system kube-flannel-ds-27zsl 100m (5%) 100m (5%) 50Mi (1%) 50Mi (1%) 21h
kube-system kube-proxy-7kcmh 0 (0%) 0 (0%) 0 (0%) 0 (0%) 21h
kube-system kube-scheduler-master 100m (5%) 0 (0%) 0 (0%) 0 (0%) 21h
kubernetes-dashboard dashboard-metrics-scraper-7cffc8f48c-h7tsq 0 (0%) 0 (0%) 0 (0%) 0 (0%) 21h
kubernetes-dashboard kubernetes-dashboard-67df665f7-m6zfg 0 (0%) 0 (0%) 0 (0%) 0 (0%) 21h
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 850m (42%) 100m (5%)
memory 190Mi (7%) 390Mi (14%)
ephemeral-storage 0 (0%) 0 (0%)
hugepages-1Gi 0 (0%) 0 (0%)
hugepages-2Mi 0 (0%) 0 (0%)
Events: <none>
Name: node
Roles: <none>
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/arch=amd64
kubernetes.io/hostname=node
kubernetes.io/os=linux
Annotations: flannel.alpha.coreos.com/backend-data: {"VtepMAC":"76:fa:1d:1f:e7:47"}
flannel.alpha.coreos.com/backend-type: vxlan
flannel.alpha.coreos.com/kube-subnet-manager: true
flannel.alpha.coreos.com/public-ip: 192.168.200.24
node.alpha.kubernetes.io/ttl: 0
volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp: Thu, 03 Dec 2020 19:32:00 -0500
Taints: <none>
Unschedulable: false
Lease:
HolderIdentity: node
AcquireTime: <unset>
RenewTime: Fri, 04 Dec 2020 06:54:26 -0500
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
NetworkUnavailable False Thu, 03 Dec 2020 20:35:12 -0500 Thu, 03 Dec 2020 20:35:12 -0500 FlannelIsUp Flannel is running on this node
MemoryPressure False Fri, 04 Dec 2020 06:51:53 -0500 Fri, 04 Dec 2020 04:43:56 -0500 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Fri, 04 Dec 2020 06:51:53 -0500 Fri, 04 Dec 2020 04:43:56 -0500 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Fri, 04 Dec 2020 06:51:53 -0500 Fri, 04 Dec 2020 04:43:56 -0500 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Fri, 04 Dec 2020 06:51:53 -0500 Fri, 04 Dec 2020 04:43:56 -0500 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 192.168.200.24
Hostname: node
Capacity:
cpu: 2
ephemeral-storage: 38770180Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 1865308Ki
pods: 110
Allocatable:
cpu: 2
ephemeral-storage: 35730597829
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 1762908Ki
pods: 110
System Info:
Machine ID: 1193ed4bd708458fb3b1ede049c16b5a
System UUID: B3AC4D56-82A6-60EA-AA9A-0A385EE08896
Boot ID: 45a6027e-b368-43f5-84d3-5b3dc47f70b0
Kernel Version: 3.10.0-862.el7.x86_64
OS Image: CentOS Linux 7 (Core)
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://19.3.13
Kubelet Version: v1.18.1
Kube-Proxy Version: v1.18.1
PodCIDR: 10.244.1.0/24
PodCIDRs: 10.244.1.0/24
Non-terminated Pods: (4 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
default mysql 0 (0%) 0 (0%) 0 (0%) 0 (0%) 12m
default nginx 0 (0%) 0 (0%) 0 (0%) 0 (0%) 7m52s
kube-system kube-flannel-ds-9gvsf 100m (5%) 100m (5%) 50Mi (2%) 50Mi (2%) 11h
kube-system kube-proxy-rrr8w 0 (0%) 0 (0%) 0 (0%) 0 (0%) 11h
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 100m (5%) 100m (5%)
memory 50Mi (2%) 50Mi (2%)
ephemeral-storage 0 (0%) 0 (0%)
hugepages-1Gi 0 (0%) 0 (0%)
hugepages-2Mi 0 (0%) 0 (0%)
Events: <none># kubectl describe pods nginx：查看pods中的Nginx的详细信息
[root@master ~]# kubectl describe pods nginx Name: nginx Namespace: default Priority: 0 Node: node/192.168.200.24 Start Time: Fri, 04 Dec 2020 06:46:35 -0500 Labels: run=nginx Annotations: <none> Status: Running IP: 10.244.1.3 IPs: IP: 10.244.1.3 Containers: nginx: Container ID: docker://9ea6ed6c3898ea20df942edf8cf9be3c2bc82c842816af83ea3f08dfa217357e Image: 192.168.200.23/library/nginx:1.14 Image ID: docker-pullable://192.168.200.23/library/nginx@sha256:706446e9c6667c0880d5da3f39c09a6c7d2114f5a5d6b74a2fafd24ae30d2078 Port: <none> Host Port: <none> State: Running Started: Fri, 04 Dec 2020 06:46:43 -0500 Ready: True Restart Count: 0 Environment: <none> Mounts: /var/run/secrets/kubernetes.io/serviceaccount from default-token-rjpwz (ro) Conditions: Type Status Initialized True Ready True ContainersReady True PodScheduled True Volumes: default-token-rjpwz: Type: Secret (a volume populated by a Secret) SecretName: default-token-rjpwz Optional: false QoS Class: BestEffort Node-Selectors: <none> Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s node.kubernetes.io/unreachable:NoExecute for 300s Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal Scheduled <unknown> default-scheduler Successfully assigned default/nginx to node Normal Pulling 9m40s kubelet, node Pulling image "192.168.200.23/library/nginx:1.14" Normal Pulled 9m34s kubelet, node Successfully pulled image "192.168.200.23/library/nginx:1.14" Normal Created 9m33s kubelet, node Created container nginx Normal Started 9m33s kubelet, node Started container nginx
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