k8s基础操作
[toc]
查看k8s中所有命名空间里面的pod
kubectl get pod -A 或 kubectl get pod --all-namespaces
| 字段 | 说明 |
|---|---|
| NAMESPACE | pod所属的命名空间 |
| NAME | pod的名称 |
| READY | 表示pod是否就绪（Ready）的状态 格式为 当前就绪的容器数量/总容器数量 |
| STATUS | 表示pod的当前状态。常⻅的状态有Running（运行中）、Pending（等待中）、CrashLoopBackOff（崩溃循环中）、Error（错误）、Backoff（反复错误）、Terminating（正在删除） |
| RESTARTS | 表示pod重启的次数 |
| AGE | 表示pod创建的时间，以时间单位（如小时、分钟或秒）的格式显示 |
$ kubectl get pod -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-5d78c9869d-26wvz 1/1 Running 0 3m39s
kube-system coredns-5d78c9869d-ns7rp 1/1 Running 0 3m46s
kube-system etcd-ops-ingress-control-plane 1/1 Running 0 3m33s
kube-system kindnet-8j6nh 1/1 Running 0 3m30s
kube-system kindnet-bv6bj 1/1 Running 0 3m31s
kube-system kindnet-p568d 1/1 Running 0 3m26s
kube-system kindnet-wsgkj 1/1 Running 0 3m28s
kube-system kube-apiserver-ops-ingress-control-plane 1/1 Running 0 3m26s
kube-system kube-controller-manager-ops-ingress-control-plane 1/1 Running 0 2m55s
kube-system kube-proxy-gqghp 1/1 Running 0 3m21s
kube-system kube-proxy-k9j7w 1/1 Running 0 3m24s
kube-system kube-proxy-q7gwp 1/1 Running 0 3m22s
kube-system kube-proxy-x5w8c 1/1 Running 0 3m19s
kube-system kube-scheduler-ops-ingress-control-plane 1/1 Running 0 2m22s
local-path-storage local-path-provisioner-6bc4bddd6b-7jwxg 1/1 Running 0 67s
查看某个命名空间的pod
kubectl get pod -n 命名空间 或 kubectl get pod --namespace 命名空间
$ kubectl get pod -n local-path-storage
NAME READY STATUS RESTARTS AGE
local-path-provisioner-6bc4bddd6b-7jwxg 1/1 Running 0 22m
不指定命名空间默认显示 default 命名空间的pod
$ kubectl get pod
No resources found in default namespace.
创建一个pod
kubectl create deployment 名称 --image 镜像:版本 --replicas 副本数量
| 参数 | 说明 |
|---|---|
| 名称 | deployment名称，必须有且同一命名空间名称唯一 |
| --image | 指定pod镜像，必须有 |
| --replicas | 非必须，如果不设置默认副本数为1 |
创建deployment
$ kubectl create deployment test --image nginx:latest --replicas 2
deployment.apps/test created
查看deployment
$ kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
test 2/2 2 2 4m36s
查看pod
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
test-7fbf5cfb6d-brtbb 1/1 Running 0 4m32s
test-7fbf5cfb6d-qwsdx 1/1 Running 0 4m32s
查看pod详细信息
kubectl describe pod名称
$ kubectl describe pod test-7fbf5cfb6d-brtbb
Name: test-7fbf5cfb6d-brtbb
Namespace: default
Priority: 0
Service Account: default
Node: ops-ingress-worker3/172.18.0.4
Start Time: Thu, 23 Nov 2023 10:35:37 +0800
Labels: app=test
pod-template-hash=7fbf5cfb6d
Annotations: <none>
Status: Running
IP: 10.244.3.6
IPs:
IP: 10.244.3.6
Controlled By: ReplicaSet/test-7fbf5cfb6d
Containers:
nginx:
Container ID: containerd://91a61ae0679f49df43318853465e55bc7cf72cca3e9727c180a21119ecbaf7a5
Image: nginx:latest
Image ID: docker.io/library/nginx@sha256:10d1f5b58f74683ad34eb29287e07dab1e90f10af243f151bb50aa5dbb4d62ee
Port: <none>
Host Port: <none>
State: Running
Started: Thu, 23 Nov 2023 10:38:45 +0800
Ready: True
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-99j67 (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
kube-api-access-99j67:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
ConfigMapOptional: <nil>
DownwardAPI: true
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 10m default-scheduler Successfully assigned default/test-7fbf5cfb6d-brtbb to ops-ingress-worker3
Normal Pulling 10m kubelet Pulling image "nginx:latest"
Normal Pulled 7m19s kubelet Successfully pulled image "nginx:latest" in 2m55.333581167s (2m55.333657653s including waiting)
Normal Created 7m18s kubelet Created container nginx
Normal Started 7m10s kubelet Started container nginx