Article Directory
Preface
What is a resource?
All content in k8s is abstracted as resources, and after the resources are instantiated, they are called objects.
What is a resource list?
In k8s, yaml format files are generally used to create pods that meet our expectations. Such yaml files are generally called resource lists
1. Writing the resource list
https://kubernetes.io/docs/setup/
View the API provided by k8s kubectl api-versions
Create xxx.yml manifest file
The main parameters:
2. Method One
Use the kubectl explaincommand to help find the necessary documents in the list and write step by step
Required parameters are required
Sample pod.yml file
[root@server2 ~]# cat pod.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
namespace: default
spec:
replicas: 1
selector:
matchLabels:
run: nginx
template:
metadata:
labels:
run: nginx
spec:
#nodeSelector:
# kubernetes.io/hostname: server4
#nodeName: server3
#hostNetwork: true
containers:
- name: nginx
image: myapp:v1
imagePullPolicy: IfNotPresent
resources:
requests:
cpu: 100m
memory: 100Mi
limits:
cpu: 0.5
memory: 512Mi
#- name: busyboxplus
# image: busyboxplus
# imagePullPolicy: IfNotPresent
# stdin: true
# tty: true
kubectl apply -f xxx.yml # 运行清单
kubectl delete -f xxx.yml # 删除清单（删除清单部署的内容）--很方便
3. Method two
Use of existing pod .yml output file is modified (more convenient, but chose to study a method)
Export command kubectl get pod nginx -o yaml
example export:
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: "2021-02-21T08:30:16Z"
generateName: nginx-67f9d9c97f-
labels:
app: nginx
pod-template-hash: 67f9d9c97f
managedFields:
- apiVersion: v1
fieldsType: FieldsV1
fieldsV1:
f:metadata:
f:generateName: {
}
f:labels:
.: {
}
f:app: {
}
f:pod-template-hash: {
}
f:ownerReferences:
.: {
}
k:{
"uid":"9a6ef1c2-dc68-4f79-8437-9a9b81cbd004"}:
.: {
}
f:apiVersion: {
}
f:blockOwnerDeletion: {
}
f:controller: {
}
f:kind: {
}
f:name: {
}
f:uid: {
}
f:spec:
f:containers:
k:{
"name":"myapp"}:
.: {
}
f:image: {
}
f:imagePullPolicy: {
}
f:name: {
}
f:resources: {
}
f:terminationMessagePath: {
}
f:terminationMessagePolicy: {
}
f:dnsPolicy: {
}
f:enableServiceLinks: {
}
f:restartPolicy: {
}
f:schedulerName: {
}
f:securityContext: {
}
f:terminationGracePeriodSeconds: {
}
manager: kube-controller-manager
operation: Update
time: "2021-02-21T08:30:16Z"
- apiVersion: v1
fieldsType: FieldsV1
fieldsV1:
f:status:
f:conditions:
k:{
"type":"ContainersReady"}:
.: {
}
f:lastProbeTime: {
}
f:lastTransitionTime: {
}
f:message: {
}
f:reason: {
}
f:status: {
}
f:type: {
}
k:{
"type":"Initialized"}:
.: {
}
f:lastProbeTime: {
}
f:lastTransitionTime: {
}
f:status: {
}
f:type: {
}
k:{
"type":"Ready"}:
.: {
}
f:lastProbeTime: {
}
f:lastTransitionTime: {
}
f:message: {
}
f:reason: {
}
f:status: {
}
f:type: {
}
f:containerStatuses: {
}
f:hostIP: {
}
f:podIP: {
}
f:podIPs:
.: {
}
k:{
"ip":"10.244.2.6"}:
.: {
}
f:ip: {
}
f:startTime: {
}
manager: kubelet
operation: Update
time: "2021-02-21T08:30:22Z"
name: nginx-67f9d9c97f-mz5v4
namespace: default
ownerReferences:
- apiVersion: apps/v1
blockOwnerDeletion: true
controller: true
kind: ReplicaSet
name: nginx-67f9d9c97f
uid: 9a6ef1c2-dc68-4f79-8437-9a9b81cbd004
resourceVersion: "115314"
uid: aa9d8806-0ca1-4296-be67-57f0ecaabded
spec:
containers:
- image: myapp:v1
imagePullPolicy: IfNotPresent
name: myapp
resources: {
}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /var/run/secrets/kubernetes.io/serviceaccount
name: default-token-96sws
readOnly: true
dnsPolicy: ClusterFirst
enableServiceLinks: true
nodeName: server4
preemptionPolicy: PreemptLowerPriority
priority: 0
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {
}
serviceAccount: default
serviceAccountName: default
terminationGracePeriodSeconds: 30
tolerations:
- effect: NoExecute
key: node.kubernetes.io/not-ready
operator: Exists
tolerationSeconds: 300
- effect: NoExecute
key: node.kubernetes.io/unreachable
operator: Exists
tolerationSeconds: 300
volumes:
- name: default-token-96sws
secret:
defaultMode: 420
secretName: default-token-96sws
status:
conditions:
- lastProbeTime: null
lastTransitionTime: "2021-02-21T08:30:16Z"
status: "True"
type: Initialized
- lastProbeTime: null
lastTransitionTime: "2021-02-21T08:30:16Z"
message: 'containers with unready status: [myapp]'
reason: ContainersNotReady
status: "False"
type: Ready
- lastProbeTime: null
lastTransitionTime: "2021-02-21T08:30:16Z"
message: 'containers with unready status: [myapp]'
reason: ContainersNotReady
status: "False"
type: ContainersReady
- lastProbeTime: null
lastTransitionTime: "2021-02-21T08:30:16Z"
status: "True"
type: PodScheduled
containerStatuses:
- image: myapp:v1
imageID: ""
lastState: {
}
name: myapp
ready: false
restartCount: 0
started: false
state:
waiting:
message: 'rpc error: code = Unknown desc = Error response from daemon: pull
access denied for myapp, repository does not exist or may require ''docker
login'': denied: requested access to the resource is denied'
reason: ErrImagePull
hostIP: 172.25.200.4
phase: Pending
podIP: 10.244.2.6
podIPs:
- ip: 10.244.2.6
qosClass: BestEffort
startTime: "2021-02-21T08:30:16Z"