查看节点详细信息
查看node节点
代码语言：javascript复制[root@k8s-master ~]# kubectl describe node k8s-node-1
Name: k8s-node-1
Roles: <none>
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/arch=amd64
kubernetes.io/hostname=k8s-node-1
kubernetes.io/os=linux
Annotations: flannel.alpha.coreos.com/backend-data: {"VtepMAC":"8e:68:0b:16:80:fd"}
flannel.alpha.coreos.com/backend-type: vxlan
flannel.alpha.coreos.com/kube-subnet-manager: true
flannel.alpha.coreos.com/public-ip: 192.168.3.6
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, 09 Jul 2020 11:58:53 0800
Taints: <none> # 是否有污点
Unschedulable: false # 是否不可以调度
Lease:
HolderIdentity: k8s-node-1
AcquireTime: <unset>
RenewTime: Sat, 11 Jul 2020 09:35:43 0800
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
NetworkUnavailable False Thu, 09 Jul 2020 11:59:50 0800 Thu, 09 Jul 2020 11:59:50 0800 FlannelIsUp Flannel is running on this node
MemoryPressure False Sat, 11 Jul 2020 09:32:45 0800 Thu, 09 Jul 2020 11:58:54 0800 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Sat, 11 Jul 2020 09:32:45 0800 Thu, 09 Jul 2020 11:58:54 0800 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Sat, 11 Jul 2020 09:32:45 0800 Thu, 09 Jul 2020 11:58:54 0800 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Sat, 11 Jul 2020 09:32:45 0800 Thu, 09 Jul 2020 11:59:54 0800 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 192.168.3.6
Hostname: k8s-node-1
Capacity:
cpu: 2
ephemeral-storage: 51354116Ki
hugepages-2Mi: 0
memory: 2048612Ki
pods: 110
Allocatable:
cpu: 2
ephemeral-storage: 47327953228
hugepages-2Mi: 0
memory: 1946212Ki
pods: 110
System Info:
Machine ID: f043c8e64c244fd1a710c92393cfc6eb
System UUID: 6E444D56-9F8F-2907-4FE1-31ED22560FAE
Boot ID: 0bd3876d-5748-4c79-a13d-c323c2e0700b
Kernel Version: 3.10.0-693.el7.x86_64
OS Image: CentOS Linux 7 (Core)
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://19.3.12
Kubelet Version: v1.18.5
Kube-Proxy Version: v1.18.5
PodCIDR: 10.244.1.0/24
PodCIDRs: 10.244.1.0/24
Non-terminated Pods: (2 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
kube-system kube-flannel-ds-amd64-64j2m 100m (5%) 100m (5%) 50Mi (2%) 50Mi (2%) 45h
kube-system kube-proxy-hdh9n 0 (0%) 0 (0%) 0 (0%) 0 (0%) 45h
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-2Mi 0 (0%) 0 (0%)
Events: <none>查看master节点
代码语言：javascript复制[root@k8s-master ~]# kubectl describe node k8s-master
Name: k8s-master
Roles: master
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/arch=amd64
kubernetes.io/hostname=k8s-master
kubernetes.io/os=linux
node-role.kubernetes.io/master=
Annotations: flannel.alpha.coreos.com/backend-data: {"VtepMAC":"32:5b:8b:0d:06:a2"}
flannel.alpha.coreos.com/backend-type: vxlan
flannel.alpha.coreos.com/kube-subnet-manager: true
flannel.alpha.coreos.com/public-ip: 192.168.3.5
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, 09 Jul 2020 11:32:39 0800
Taints: node-role.kubernetes.io/master:NoSchedule # master是有污点的，不可以调度。
Unschedulable: false
Lease:
HolderIdentity: k8s-master
AcquireTime: <unset>
RenewTime: Sat, 11 Jul 2020 09:39:06 0800
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
NetworkUnavailable False Thu, 09 Jul 2020 11:44:34 0800 Thu, 09 Jul 2020 11:44:34 0800 FlannelIsUp Flannel is running on this node
MemoryPressure False Sat, 11 Jul 2020 09:37:55 0800 Thu, 09 Jul 2020 11:32:33 0800 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Sat, 11 Jul 2020 09:37:55 0800 Thu, 09 Jul 2020 11:32:33 0800 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Sat, 11 Jul 2020 09:37:55 0800 Thu, 09 Jul 2020 11:32:33 0800 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Sat, 11 Jul 2020 09:37:55 0800 Thu, 09 Jul 2020 11:44:41 0800 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 192.168.3.5
Hostname: k8s-master
Capacity:
cpu: 2
ephemeral-storage: 51354116Ki
hugepages-2Mi: 0
memory: 2048612Ki
pods: 110
Allocatable:
cpu: 2
ephemeral-storage: 47327953228
hugepages-2Mi: 0
memory: 1946212Ki
pods: 110
System Info:
Machine ID: ad96724432424945be1afc247362540d
System UUID: E12E4D56-6255-0FE8-731C-3A330593CDAE
Boot ID: 1f2ed42c-2bfc-45b5-863b-ce6aa5c52780
Kernel Version: 3.10.0-693.el7.x86_64
OS Image: CentOS Linux 7 (Core)
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://19.3.12
Kubelet Version: v1.18.5
Kube-Proxy Version: v1.18.5
PodCIDR: 10.244.0.0/24
PodCIDRs: 10.244.0.0/24
Non-terminated Pods: (8 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
kube-system coredns-66bff467f8-jwrl5 100m (5%) 0 (0%) 70Mi (3%) 170Mi (8%) 46h
kube-system coredns-66bff467f8-s4jbd 100m (5%) 0 (0%) 70Mi (3%) 170Mi (8%) 46h
kube-system etcd-k8s-master 0 (0%) 0 (0%) 0 (0%) 0 (0%) 46h
kube-system kube-apiserver-k8s-master 250m (12%) 0 (0%) 0 (0%) 0 (0%) 46h
kube-system kube-controller-manager-k8s-master 200m (10%) 0 (0%) 0 (0%) 0 (0%) 46h
kube-system kube-flannel-ds-amd64-sfqlj 100m (5%) 100m (5%) 50Mi (2%) 50Mi (2%) 45h
kube-system kube-proxy-nx7nr 0 (0%) 0 (0%) 0 (0%) 0 (0%) 46h
kube-system kube-scheduler-k8s-master 100m (5%) 0 (0%) 0 (0%) 0 (0%) 46h
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 850m (42%) 100m (5%)
memory 190Mi (9%) 390Mi (20%)
ephemeral-storage 0 (0%) 0 (0%)
hugepages-2Mi 0 (0%) 0 (0%)
Events: <none>查看k8s版本
代码语言：javascript复制[root@k8s-master ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.5", GitCommit:"e6503f8d8f769ace2f338794c914a96fc335df0f", GitTreeState:"clean", BuildDate:"2020-06-26T03:47:41Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.5", GitCommit:"e6503f8d8f769ace2f338794c914a96fc335df0f", GitTreeState:"clean", BuildDate:"2020-06-26T03:39:24Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}查看集群状态
代码语言：javascript复制[root@k8s-master ~]# kubectl cluster-info
Kubernetes master is running at https://192.168.3.5:6443
KubeDNS is running at https://192.168.3.5:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.创建应用
在k8s中，创建一个应用可以使用kubectl run命令来操作。
[root@k8s-master ~]# kubectl run --help
Create and run a particular image in a pod.
Examples:
# Start a nginx pod.
kubectl run nginx --image=nginx
# Start a replicated instance of nginx
kubectl run nginx --image=nginx --replicas=5 # 设置5个副本，1.18.0以后废弃
# Start a hazelcast pod and let the container expose port 5701.
# 启动单个hazelcast实例，让容器暴露端口5701。
kubectl run hazelcast --image=hazelcast/hazelcast --port=5701
# Start a hazelcast pod and set environment variables "DNS_DOMAIN=cluster" and "POD_NAMESPACE=default" in the
container.
kubectl run hazelcast --image=hazelcast/hazelcast --env="DNS_DOMAIN=cluster" --env="POD_NAMESPACE=default"
# Start a hazelcast pod and set labels "app=hazelcast" and "env=prod" in the container.
kubectl run hazelcast --image=hazelcast/hazelcast --labels="app=hazelcast,env=prod"
# Dry run. Print the corresponding API objects without creating them.
kubectl run nginx --image=nginx --dry-run=client # --dry-run 单跑模式，只运行。
# Start a nginx pod, but overload the spec with a partial set of values parsed from JSON.
# 启动单个nginx实例，但使用从JSON解析的部分值集合重载部署规范。
kubectl run nginx --image=nginx --overrides='{ "apiVersion": "v1", "spec": { ... } }'
# Start a busybox pod and keep it in the foreground, don't restart it if it exits.
# 启动busybox的pod并将其保留在前台，如果退出则不要重启.
kubectl run -i -t busybox --image=busybox --restart=Never
# Start the nginx pod using the default command, but use custom arguments (arg1 .. argN) for that command.
# 使用default命令启动nginx容器，但为该命令使用自定义参数（arg1 .. argN）
kubectl run nginx --image=nginx -- <arg1> <arg2> ... <argN>
# Start the nginx pod using a different command and custom arguments.
# 使用不同的命令和自定义参数启动nginx容器。
kubectl run nginx --image=nginx --command -- <cmd> <arg1> ... <argN>
# Start the cron job to compute π to 2000 places and print it out every 5 minutes.
# 启动cron作业以计算π到2000个位置并每5分钟打印一次。
kubectl run pi --schedule="0/5 * * * ?" --image=perl --restart=OnFailure -- perl -Mbignum=bpi -wle 'print bpi(2000)'
....dry-run
代码语言：javascript复制kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80 --replicas=1 --dry-run=true
Flag --replicas has been deprecated, has no effect and will be removed in the future.
W0711 09:58:29.670673 24920 helpers.go:549] --dry-run=true is deprecated (boolean value) and can be replaced with --dry-run=client.
pod/nginx-deploy created (dry run)创建
[root@k8s-master ~]# kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80 --replicas=1 Flag --replicas has been deprecated, has no effect and will be removed in the future. # 1.18已经不支持replicas了 pod/nginx-deploy created
代码语言：javascript复制[root@k8s-master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 119s创建service
代码语言：javascript复制[root@k8s-master ~]# kubectl expose deployment nginx-deploy --name=nginx --port=80 --target-port=80 --protocol=TCP
service/nginx exposed查看pod
代码语言：javascript复制[root@k8s-master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 3m25s 10.244.3.2 k8s-node-1 <none> <none>
nginx-deploy-784f598b6c-bh647 1/1 Running 0 21s 10.244.2.4 k8s-node-2 <none> <none>
[root@k8s-master ~]# kubectl run client --image=busybox -it --restart=Never
If you don't see a command prompt, try pressing enter.
/ # PS:持续更新中
