prometheus监控使用（按照文档步骤就可以操作成功）。
文档分别坐了使用k8s集群部署docker 跑prometheus监控。（后期如果有时间会做一个监控pod的文档）
监控K8s细节文章链接
https://blog.csdn.net/zeorg/article/details/112164465
特别说明：此环境要提前部署好k8s。
1、prometheus 作为监控k8s的最佳选择在这里做一个在k8s部署prometheus文档供大家参考。

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系统环境：

IP	节点名称（不是主机名）
192.168.182.150	k8s-master
192.168.182.151	k8s-node2
192.168.182.152	k8s-node2
192.168.182.153	docker仓库

1、在docker仓库里面先拉取prometheus images（直接使用k8s拉取因为网络问题可以说基本是失败的）。
docker仓库执行

docker pull prom/prometheus:v2.2.1 
docker   tag   prom/prometheus:v2.2.1  192.168.182.153:5000/prom/prometheus:v2.2.1
###为prometheus:v2.2.1 images 打一个标签
docker   push  192.168.182.153:5000/prom/prometheus:v2.2.1
##上传打包后的prometheus:v2.2.1镜像

2、使用k8s创建prometheus 容器配置。
k8s-master执行

创建文件prometheus-config.yml（如果是实验环境目录无所谓）
apiVersion: v1
kind: ConfigMap
metadata:
  name: prometheus-config
data:
  prometheus.yml: |
    global:
      scrape_interval:     15s
      evaluation_interval: 15s
    scrape_configs:
      - job_name: 'prometheus'
        static_configs:
        - targets: ['localhost:9090']
创建文件prometheus-deployment.yml（如果是实验环境目录无所谓）
apiVersion: v1
kind: "Service"
metadata:
  name: prometheus
  labels:
    name: prometheus
spec:
  ports:
  - name: prometheus
    protocol: TCP
    port: 9090
    targetPort: 9090
  selector:
    app: prometheus
  type: NodePort
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    name: prometheus
  name: prometheus
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: prometheus
    spec:
      containers:
      - name: prometheus
        image: prom/prometheus:v2.2.1
        command:
        - "/bin/prometheus"
        args:
        - "--config.file=/etc/prometheus/prometheus.yml"
        ports:
        - containerPort: 9090
          protocol: TCP
        volumeMounts:
        - mountPath: "/etc/prometheus"
          name: prometheus-config
      volumes:
      - name: prometheus-config
        configMap:
          name: prometheus-config

3、使用k8s下发任务。
k8s-master执行

kubectl create -f prometheus-config.yml
kubeckubectl create -f prometheus-deployment.yml

4、查看任务进度。
k8s-master执行

[root@master prometheus]# kubectl get pods    ##如果下方创建失败可以根据NAME名称查看日志
NAME                          READY     STATUS    RESTARTS   AGE
nginx-3121059884-lx6qc        1/1       Running   0          1h
nginx-3121059884-n6bdl        1/1       Running   0          1h
nginx-3121059884-n9pxz        1/1       Running   1          4h
prometheus-3596598276-5wrkl   1/1       Running   0          1h

5、查看失败日志（我上面是成功后的所以状态是Running）大家可以看我的报错有多次镜像拉取失败。
k8s-master执行

 kubectl describe pod prometheus-3596598276-5wrkl
Name:           prometheus-3596598276-5wrkl
Namespace:      default
Node:           node-1/192.168.182.151
Start Time:     Fri, 01 Jan 2021 21:39:02 +0800
Labels:         app=prometheus
                pod-template-hash=3596598276
Status:         Running
IP:             10.10.17.5
Controllers:    ReplicaSet/prometheus-3596598276
Containers:
  prometheus:
    Container ID:       docker://d2887dbb516b7415f0ddf1ee1c8fbf0b389db935e361c6108c44a9b52bb6ef29
    Image:              prom/prometheus:v2.2.1
    Image ID:           docker-pullable://192.168.182.153:5000/prom/prometheus@sha256:b0912ab008c270be88f6e81d3df6dfd24b7c1f9b4aacbffa70abe2a382152223
    Port:               9090/TCP
    Command:
      /bin/prometheus
    Args:
      --config.file=/etc/prometheus/prometheus.yml
    State:              Running
      Started:          Fri, 01 Jan 2021 22:24:25 +0800
    Ready:              True
    Restart Count:      0
    Volume Mounts:
      /etc/prometheus from prometheus-config (rw)
    Environment Variables:      <none>
Conditions:
  Type          Status
  Initialized   True 
  Ready         True 
  PodScheduled  True 
Volumes:
  prometheus-config:
    Type:       ConfigMap (a volume populated by a ConfigMap)
    Name:       prometheus-config
QoS Class:      BestEffort
Tolerations:    <none>
Events:
  FirstSeen     LastSeen        Count   From                    SubObjectPath                   Type            Reason                  Message
  ---------     --------        -----   ----                    -------------                   --------        ------                  -------
  1h            58m             9       {default-scheduler }                                    Warning         FailedScheduling        no nodes available to schedule pods
  57m           57m             6       {default-scheduler }                                    Warning         FailedScheduling        no nodes available to schedule pods
  56m           56m             1       {default-scheduler }                                    Normal          Scheduled               Successfully assigned prometheus-3596598276-5wrkl to node-1
  56m           44m             14      {kubelet node-1}                                        Warning         FailedMount             MountVolume.SetUp failed for volume "kubernetes.io/configmap/0a83b05e-4c34-11eb-ae3b-000c29fd225f-prometheus-config" (spec.Name: "prometheus-config") pod "0a83b05e-4c34-11eb-ae3b-000c29fd225f" (UID: "0a83b05e-4c34-11eb-ae3b-000c29fd225f") with: configmaps "prometheus-config" not found
  54m           43m             6       {kubelet node-1}                                        Warning         FailedMount             Unable to mount volumes for pod "prometheus-3596598276-5wrkl_default(0a83b05e-4c34-11eb-ae3b-000c29fd225f)": timeout expired waiting for volumes to attach/mount for pod "default"/"prometheus-3596598276-5wrkl". list of unattached/unmounted volumes=[prometheus-config]
  54m           43m             6       {kubelet node-1}                                        Warning         FailedSync              Error syncing pod, skipping: timeout expired waiting for volumes to attach/mount for pod "default"/"prometheus-3596598276-5wrkl". list of unattached/unmounted volumes=[prometheus-config]
  32m           32m             1       {kubelet node-1}        spec.containers{prometheus}     Normal          BackOff                 Back-off pulling image "prom/prometheus:v2.2.1"
  32m           32m             1       {kubelet node-1}                                        Warning         FailedSync              Error syncing pod, skipping: failed to "StartContainer" for "prometheus" with ImagePullBackOff: "Back-off pulling image \"prom/prometheus:v2.2.1\""

  32m   14m     2       {kubelet node-1}        spec.containers{prometheus}     Warning Failed          Failed to pull image "prom/prometheus:v2.2.1": net/http: request canceled
  32m   14m     2       {kubelet node-1}                                        Warning FailedSync      Error syncing pod, skipping: failed to "StartContainer" for "prometheus" with ErrImagePull: "net/http: request canceled"

  42m   14m     3       {kubelet node-1}        spec.containers{prometheus}     Normal  Pulling                 pulling image "prom/prometheus:v2.2.1"
  11m   11m     1       {kubelet node-1}        spec.containers{prometheus}     Normal  Pulled                  Successfully pulled image "prom/prometheus:v2.2.1"
  42m   11m     2       {kubelet node-1}                                        Warning MissingClusterDNS       kubelet does not have ClusterDNS IP configured and cannot create Pod using "ClusterFirst" policy. Falling back to DNSDefault policy.
  11m   11m     1       {kubelet node-1}        spec.containers{prometheus}     Normal  Created                 Created container with docker id d2887dbb516b; Security:[seccomp=unconfined]
  11m   11m     1       {kubelet node-1}        spec.containers{prometheus}     Normal  Started                 Started container with docker id d2887dbb516b

6、查看容器随机分配端口。
k8s-master执行

[root@master prometheus]# kubectl get all
NAME                DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deploy/nginx        3         3         3            3           4h
deploy/prometheus   1         1         1            1           1h

NAME             CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
svc/kubernetes   10.10.0.1       <none>        443/TCP          4h
svc/nginx        10.10.214.157   <nodes>       80:31882/TCP     4h
svc/prometheus   10.10.165.138   <nodes>       9090:32332/TCP   1h

6、在web浏览器打开。