run 或create deployment 部署一个应用

kubernetes 部署 nginx ,使用 kubectl get deployment 时出现 No resources found in default namespace

结果验证:
kubectl run mcw01_nginx --image=nginx #能get pod,但不能get deployment ,不能get replicaset
kubectl create deployment mcw01dep-nginx --image=nginx #既能get pod ,又能get deployment,又能get replicaset

kubectl run nginx-deployment --image=nginx:1.7.9 --replicas=2 #它不能 创建副本了,
kubectl create deployment mcw01dep-nginx --image=nginx #那么这个命令是否可以支持创建多个副本

首先我确保了master和nodes节点的正常运行,还有各个组件处于健康状态
使用 kubectl 命令创建监听 80 端口的 Nginx Pod(Kubernetes 运行容器的最小单元)
kubectl run mcw01_nginx --image=nginx --port=80
运行结果:

  1. [machangwei@mcw7 ~]$ kubectl run nginx-deployment --image=nginx:1.7.9 --replicas=2
  2. Error: unknown flag: --replicas
  3. See 'kubectl run --help' for usage.
  4. [machangwei@mcw7 ~]$ kubectl run mcw01_nginx --image=nginx --port=80 #不能使用下划线命名,但是可以用短横线
  5. The Pod "mcw01_nginx" is invalid:
  6. * metadata.name: Invalid value: "mcw01_nginx": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')
  7. * spec.containers[0].name: Invalid value: "mcw01_nginx": a lowercase RFC 1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name', or '123-abc', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?')
  8. [machangwei@mcw7 ~]$
  9. [machangwei@mcw7 ~]$ kubectl run mcw01-nginx --image=nginx --port=80
  10. pod/mcw01-nginx created

可以看到,这里提示只是成功创建了一个pod 叫mcw01_nginx,在以往的版本中似乎会顺便创建一个deployment,显然这里没有

使用 kubectl get deployment命令查看deployment

  1. [machangwei@mcw7 ~]$ kubectl get deployment
  2. No resources found in default namespace.

问题就出现了,的确没有,那我们就需要手动创建

使用 kubectl create deployment mcw01dep-nginx --image=nginx

  1. [machangwei@mcw7 ~]$ kubectl create deployment mcw01dep-nginx --image=nginx
  2. deployment.apps/mcw01dep-nginx created

再次使用kubectl get deployment查看,可以看到已经有了一个mcw01dep-nginx 的 deployment

  1. [machangwei@mcw7 ~]$ kubectl get deployment
  2. NAME READY UP-TO-DATE AVAILABLE AGE
  3. mcw01dep-nginx 1/1 1 1 48s

再次使用kubectl get replicaset看副本,有mcw01dep-nginx命名的副本

  1. [machangwei@mcw7 ~]$ kubectl get replicaset
  2. NAME DESIRED CURRENT READY AGE
  3. mcw01dep-nginx-5dd785954d 1 1 1 6m26s

使用kubectl get pod也能看到mcw01dep-nginx命名的Pod。

  1. [machangwei@mcw7 ~]$ kubectl get pod
  2. NAME READY STATUS RESTARTS AGE
  3. httpd-app 1/1 Running 0 3h12m
  4. mcw01-nginx 1/1 Running 0 3m55s
  5. mcw01dep-nginx-5dd785954d-sb8ps 1/1 Running 0 94s
  6. mcw1httpd-app 1/1 Running 0 162m
  7. nginx-deployment 1/1 Running 0 12m

查看刚刚部署的应用

  1. [machangwei@mcw7 ~]$ kubectl get deployment
  2. NAME READY UP-TO-DATE AVAILABLE AGE
  3. mcw01dep-nginx 1/1 1 1 9m37s
  4. [machangwei@mcw7 ~]$ kubectl describe deployment mcw01dep-nginx
  5. Name: mcw01dep-nginx
  6. Namespace: default
  7. CreationTimestamp: Tue, 04 Jan 2022 09:49:28 +0800
  8. Labels: app=mcw01dep-nginx
  9. Annotations: deployment.kubernetes.io/revision: 1
  10. Selector: app=mcw01dep-nginx
  11. Replicas: 1 desired | 1 updated | 1 total | 1 available | 0 unavailable
  12. StrategyType: RollingUpdate
  13. MinReadySeconds: 0
  14. RollingUpdateStrategy: 25% max unavailable, 25% max surge
  15. Pod Template:
  16. Labels: app=mcw01dep-nginx
  17. Containers:
  18. nginx:
  19. Image: nginx
  20. Port: <none>
  21. Host Port: <none>
  22. Environment: <none>
  23. Mounts: <none>
  24. Volumes: <none>
  25. Conditions:
  26. Type Status Reason
  27. ---- ------ ------
  28. Available True MinimumReplicasAvailable
  29. Progressing True NewReplicaSetAvailable
  30. OldReplicaSets: <none>
  31. NewReplicaSet: mcw01dep-nginx-5dd785954d (1/1 replicas created)
  32. Events:
  33. Type Reason Age From Message
  34. ---- ------ ---- ---- -------
  35. Normal ScalingReplicaSet 10m deployment-controller Scaled up replica set mcw01dep-nginx-5dd785954d to 1

查看刚刚部署的应用的副本

  1. [machangwei@mcw7 ~]$ kubectl get replicaset
  2. NAME DESIRED CURRENT READY AGE
  3. mcw01dep-nginx-5dd785954d 1 1 1 15m
  4. [machangwei@mcw7 ~]$ kubectl describe replicaset mcw01dep-nginx-5dd785954d
  5. Name: mcw01dep-nginx-5dd785954d
  6. Namespace: default
  7. Selector: app=mcw01dep-nginx,pod-template-hash=5dd785954d
  8. Labels: app=mcw01dep-nginx
  9. pod-template-hash=5dd785954d
  10. Annotations: deployment.kubernetes.io/desired-replicas: 1
  11. deployment.kubernetes.io/max-replicas: 2
  12. deployment.kubernetes.io/revision: 1
  13. Controlled By: Deployment/mcw01dep-nginx
  14. Replicas: 1 current / 1 desired
  15. Pods Status: 1 Running / 0 Waiting / 0 Succeeded / 0 Failed
  16. Pod Template:
  17. Labels: app=mcw01dep-nginx
  18. pod-template-hash=5dd785954d
  19. Containers:
  20. nginx:
  21. Image: nginx
  22. Port: <none>
  23. Host Port: <none>
  24. Environment: <none>
  25. Mounts: <none>
  26. Volumes: <none>
  27. Events:
  28. Type Reason Age From Message
  29. ---- ------ ---- ---- -------
  30. Normal SuccessfulCreate 15m replicaset-controller Created pod: mcw01dep-nginx-5dd785954d-sb8ps

查看刚刚部署的应用的Pod信息

  1. [machangwei@mcw7 ~]$ kubectl describe pod mcw01dep-nginx-5dd785954d-sb8ps
  2. Name: mcw01dep-nginx-5dd785954d-sb8ps
  3. Namespace: default
  4. Priority: 0
  5. Node: mcw9/10.0.0.139
  6. Start Time: Tue, 04 Jan 2022 09:49:27 +0800
  7. Labels: app=mcw01dep-nginx
  8. pod-template-hash=5dd785954d
  9. Annotations: <none>
  10. Status: Running
  11. IP: 10.244.0.4
  12. IPs:
  13. IP: 10.244.0.4
  14. Controlled By: ReplicaSet/mcw01dep-nginx-5dd785954d
  15. Containers:
  16. nginx:
  17. Container ID: docker://374ff9c1a60e9562f7e05ec4eaa5150e3380b836a26f3b0fe565e6f9dea52cef
  18. Image: nginx
  19. Image ID: docker-pullable://nginx@sha256:0d17b565c37bcbd895e9d92315a05c1c3c9a29f762b011a10c54a66cd53c9b31
  20. Port: <none>
  21. Host Port: <none>
  22. State: Running
  23. Started: Tue, 04 Jan 2022 09:49:30 +0800
  24. Ready: True
  25. Restart Count: 0
  26. Environment: <none>
  27. Mounts:
  28. /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-h56zh (ro)
  29. Conditions:
  30. Type Status
  31. Initialized True
  32. Ready True
  33. ContainersReady True
  34. PodScheduled True
  35. Volumes:
  36. kube-api-access-h56zh:
  37. Type: Projected (a volume that contains injected data from multiple sources)
  38. TokenExpirationSeconds: 3607
  39. ConfigMapName: kube-root-ca.crt
  40. ConfigMapOptional: <nil>
  41. DownwardAPI: true
  42. QoS Class: BestEffort
  43. Node-Selectors: <none>
  44. Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
  45. node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
  46. Events:
  47. Type Reason Age From Message
  48. ---- ------ ---- ---- -------
  49. Normal Scheduled 18m default-scheduler Successfully assigned default/mcw01dep-nginx-5dd785954d-sb8ps to mcw9
  50. Normal Pulling 18m kubelet Pulling image "nginx"
  51. Normal Pulled 18m kubelet Successfully pulled image "nginx" in 1.193138975s
  52. Normal Created 18m kubelet Created container nginx
  53. Normal Started 18m kubelet Started container nginx

指定命名空间的查询Pod详情,应该是一样的

  1. [machangwei@mcw7 ~]$ kubectl get pod --all-namespaces
  2. NAMESPACE NAME READY STATUS RESTARTS AGE
  3. default httpd-app 1/1 Running 0 3h31m
  4. default mcw01-nginx 1/1 Running 0 22m
  5. default mcw01dep-nginx-5dd785954d-sb8ps 1/1 Running 0 20m
  6. default mcw1httpd-app 1/1 Running 0 3h1m
  7. default nginx-deployment 1/1 Running 0 31m
  8. kube-system coredns-6d8c4cb4d-2296m 1/1 Running 1 (9h ago) 13h
  9. kube-system coredns-6d8c4cb4d-lphb2 1/1 Running 1 (9h ago) 13h
  10. kube-system etcd-mcw7 1/1 Running 3 13h
  11. kube-system kube-apiserver-mcw7 1/1 Running 2 13h
  12. kube-system kube-controller-manager-mcw7 1/1 Running 4 (9h ago) 13h
  13. kube-system kube-flannel-ds-5pxmj 0/1 Error 102 (5m12s ago) 8h
  14. kube-system kube-flannel-ds-8gzfq 1/1 Running 0 9h
  15. kube-system kube-flannel-ds-s4qmj 0/1 CrashLoopBackOff 95 (62s ago) 7h46m
  16. kube-system kube-proxy-4lmsx 1/1 Running 0 8h
  17. kube-system kube-proxy-c5zmm 1/1 Running 0 13h
  18. kube-system kube-proxy-npmtv 1/1 Running 0 7h46m
  19. kube-system kube-scheduler-mcw7 1/1 Running 3 (9h ago) 13h
  20. [machangwei@mcw7 ~]$ kubectl describe pod mcw01dep-nginx-5dd785954d-sb8ps --namespace=default
  21. Name: mcw01dep-nginx-5dd785954d-sb8ps
  22. Namespace: default
  23. Priority: 0
  24. Node: mcw9/10.0.0.139
  25. Start Time: Tue, 04 Jan 2022 09:49:27 +0800
  26. Labels: app=mcw01dep-nginx
  27. pod-template-hash=5dd785954d
  28. Annotations: <none>
  29. Status: Running
  30. IP: 10.244.0.4
  31. IPs:
  32. IP: 10.244.0.4
  33. Controlled By: ReplicaSet/mcw01dep-nginx-5dd785954d
  34. Containers:
  35. nginx:
  36. Container ID: docker://374ff9c1a60e9562f7e05ec4eaa5150e3380b836a26f3b0fe565e6f9dea52cef
  37. Image: nginx
  38. Image ID: docker-pullable://nginx@sha256:0d17b565c37bcbd895e9d92315a05c1c3c9a29f762b011a10c54a66cd53c9b31
  39. Port: <none>
  40. Host Port: <none>
  41. State: Running
  42. Started: Tue, 04 Jan 2022 09:49:30 +0800
  43. Ready: True
  44. Restart Count: 0
  45. Environment: <none>
  46. Mounts:
  47. /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-h56zh (ro)
  48. Conditions:
  49. Type Status
  50. Initialized True
  51. Ready True
  52. ContainersReady True
  53. PodScheduled True
  54. Volumes:
  55. kube-api-access-h56zh:
  56. Type: Projected (a volume that contains injected data from multiple sources)
  57. TokenExpirationSeconds: 3607
  58. ConfigMapName: kube-root-ca.crt
  59. ConfigMapOptional: <nil>
  60. DownwardAPI: true
  61. QoS Class: BestEffort
  62. Node-Selectors: <none>
  63. Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
  64. node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
  65. Events:
  66. Type Reason Age From Message
  67. ---- ------ ---- ---- -------
  68. Normal Scheduled 21m default-scheduler Successfully assigned default/mcw01dep-nginx-5dd785954d-sb8ps to mcw9
  69. Normal Pulling 21m kubelet Pulling image "nginx"
  70. Normal Pulled 21m kubelet Successfully pulled image "nginx" in 1.193138975s
  71. Normal Created 21m kubelet Created container nginx
  72. Normal Started 21m kubelet Started container nginx
  73. [machangwei@mcw7 ~]$

对刚刚部署的应用做几种资源的查询

  1. [machangwei@mcw7 ~]$ kubectl get deployment
  2. NAME READY UP-TO-DATE AVAILABLE AGE
  3. mcw01dep-nginx 1/1 1 1 23m
  4. [machangwei@mcw7 ~]$ kubectl get replicaset
  5. NAME DESIRED CURRENT READY AGE
  6. mcw01dep-nginx-5dd785954d 1 1 1 23m
  7. [machangwei@mcw7 ~]$ kubectl get pod |grep mcw01dep-nginx
  8. mcw01dep-nginx-5dd785954d-sb8ps 1/1 Running 0 23m
  9. [machangwei@mcw7 ~]$ kubectl get pod -o wide |grep mcw01dep-nginx
  10. mcw01dep-nginx-5dd785954d-sb8ps 1/1 Running 0 23m 10.244.0.4 mcw9 <none> <none>
  11. [machangwei@mcw7 ~]$ kubectl get pod --all-namespaces |grep mcw01dep-nginx
  12. default mcw01dep-nginx-5dd785954d-sb8ps 1/1 Running 0 24m

创建同名的deployment是不可以的

  1. [machangwei@mcw7 ~]$ kubectl get deployment
  2. NAME READY UP-TO-DATE AVAILABLE AGE
  3. mcw01dep-nginx 1/1 1 1 31m
  4. [machangwei@mcw7 ~]$ kubectl create deployment mcw01dep-nginx --image=nginx
  5. error: failed to create deployment: deployments.apps "mcw01dep-nginx" already exists

使用负载均衡模式发布服务,让外网访问我的Nginx服务(docker)

kubectl expose deployment mcw01dep-nginx --port=80 --type=LoadBalancer

  1. [machangwei@mcw7 ~]$ kubectl get deployment
  2. NAME READY UP-TO-DATE AVAILABLE AGE
  3. mcw01dep-nginx 1/1 1 1 33m
  4. [machangwei@mcw7 ~]$ kubectl expose deployment mcw01dep-nginx --port=80 --type=LoadBalancer
  5. service/mcw01dep-nginx exposed

查看服务详情

kubectl describe service mcw01dep-nginx
输出如下:

  1. [machangwei@mcw7 ~]$ kubectl get service #获取服务信息
  2. NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
  3. kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 13h
  4. mcw01dep-nginx LoadBalancer 10.96.184.54 <pending> 80:30102/TCP 74s
  5. [machangwei@mcw7 ~]$ kubectl describe service mcw01dep-nginx
  6. Name: mcw01dep-nginx
  7. Namespace: default
  8. Labels: app=mcw01dep-nginx
  9. Annotations: <none>
  10. Selector: app=mcw01dep-nginx
  11. Type: LoadBalancer
  12. IP Family Policy: SingleStack
  13. IP Families: IPv4
  14. IP: 10.96.184.54
  15. IPs: 10.96.184.54
  16. Port: <unset> 80/TCP
  17. TargetPort: 80/TCP
  18. NodePort: <unset> 30102/TCP
  19. Endpoints: 10.244.0.4:80
  20. Session Affinity: None
  21. External Traffic Policy: Cluster
  22. Events: <none>

这里我就可以利用 节点的ip+暴露出来的端口 检测服务是否访问成功

  1. [machangwei@mcw7 ~]$ kubectl get pod -o wide |grep mcw01dep-nginx
  2. mcw01dep-nginx-5dd785954d-sb8ps 1/1 Running 0 43m 10.244.0.4 mcw9 <none> <none>
  3. [machangwei@mcw7 ~]$ kubectl describe pod mcw01dep-nginx-5dd785954d-sb8ps|grep Node:
  4. Node: mcw9/10.0.0.139

由上找到服务所在的Node ip ,找到服务暴露出来的NodePort ,然后在外部就可以使用Node ip :NodePort来访问服务
比如这里的访问:
我在master节点访问node2节点上的服务,这个服务是node2ip,端口,映射到node2的应用docker上的80服务

  1. [machangwei@mcw7 ~]$ curl 10.0.0.139:30102
  2. <!DOCTYPE html>
  3. <html>
  4. <head>
  5. <title>Welcome to nginx!</title>
  6. <style>
  7. html { color-scheme: light dark; }
  8. body { width: 35em; margin: 0 auto;
  9. font-family: Tahoma, Verdana, Arial, sans-serif; }
  10. </style>
  11. </head>
  12. <body>
  13. <h1>Welcome to nginx!</h1>
  14. <p>If you see this page, the nginx web server is successfully installed and
  15. working. Further configuration is required.</p>
  16.  
  17. <p>For online documentation and support please refer to
  18. <a href="http://nginx.org/">nginx.org</a>.<br/>
  19. Commercial support is available at
  20. <a href="http://nginx.com/">nginx.com</a>.</p>
  21.  
  22. <p><em>Thank you for using nginx.</em></p>
  23. </body>
  24. </html>

笔记本浏览器上访问:

进入服务所在的主机节点,查看容器的ip,与之前看的容器ip等信息一致

  1. [root@mcw9 ~]$ docker ps|grep mcw01dep-nginx
  2. 374ff9c1a60e nginx "/docker-entrypoint.…" 49 minutes ago Up 49 minutes k8s_nginx_mcw01dep-nginx-5dd785954d-sb8ps_default_13d59a7a-c16f-44f1-b442-de7252ae4bac_0
  3. 388265797ee1 registry.aliyuncs.com/google_containers/pause:3.6 "/pause" 49 minutes ago Up 49 minutes k8s_POD_mcw01dep-nginx-5dd785954d-sb8ps_default_13d59a7a-c16f-44f1-b442-de7252ae4bac_0
  4. [root@mcw9 ~]$ docker exec -it 374 hostname -i
  5. 10.244.0.4
  6. [root@mcw9 ~]$ docker exec -it 388 hostname -i
  7. OCI runtime exec failed: exec failed: container_linux.go:380: starting container process caused: exec: "hostname": executable file not found in $PATH: unknown
  8. [root@mcw9 ~]$

在Nginx服务的主机上,是能直接通容器ip的

  1. [root@mcw9 ~]$ docker exec -it 374 hostname -i
  2. 10.244.0.4
  3. [root@mcw9 ~]$ docker exec -it 388 hostname -i
  4. OCI runtime exec failed: exec failed: container_linux.go:380: starting container process caused: exec: "hostname": executable file not found in $PATH: unknown
  5. [root@mcw9 ~]$
  6. [root@mcw9 ~]$
  7. [root@mcw9 ~]$
  8. [root@mcw9 ~]$
  9. [root@mcw9 ~]$ ping 10.244.0.4
  10. PING 10.244.0.4 (10.244.0.4) 56(84) bytes of data.
  11. 64 bytes from 10.244.0.4: icmp_seq=1 ttl=64 time=0.256 ms
  12. 64 bytes from 10.244.0.4: icmp_seq=2 ttl=64 time=0.059 ms
  13. ^C
  14. --- 10.244.0.4 ping statistics ---
  15. 2 packets transmitted, 2 received, 0% packet loss, time 1000ms
  16. rtt min/avg/max/mdev = 0.059/0.157/0.256/0.099 ms
  17. [root@mcw9 ~]$ curl 10.244.0.4:80
  18. <!DOCTYPE html>
  19. <html>
  20. <head>
  21. <title>Welcome to nginx!</title>
  22. <style>
  23. html { color-scheme: light dark; }
  24. body { width: 35em; margin: 0 auto;
  25. font-family: Tahoma, Verdana, Arial, sans-serif; }
  26. </style>
  27. </head>
  28. <body>
  29. <h1>Welcome to nginx!</h1>
  30. <p>If you see this page, the nginx web server is successfully installed and
  31. working. Further configuration is required.</p>
  32.  
  33. <p>For online documentation and support please refer to
  34. <a href="http://nginx.org/">nginx.org</a>.<br/>
  35. Commercial support is available at
  36. <a href="http://nginx.com/">nginx.com</a>.</p>
  37.  
  38. <p><em>Thank you for using nginx.</em></p>
  39. </body>
  40. </html>
  41. [root@mcw9 ~]$

命令行部署多个副本的应用

部署多个Nginx,然后可以用上面那个例子,去做负载均衡了

  1. [machangwei@mcw7 ~]$ kubectl get deployment
  2. NAME READY UP-TO-DATE AVAILABLE AGE
  3. mcw-depcluster 3/3 3 3 92s
  4. mcw01dep-nginx 1/1 1 1 61m
  5. [machangwei@mcw7 ~]$ kubectl get replicaset
  6. NAME DESIRED CURRENT READY AGE
  7. mcw-depcluster-547cfdc745 3 3 3 101s
  8. mcw01dep-nginx-5dd785954d 1 1 1 61m
  9. [machangwei@mcw7 ~]$ kubectl get pod
  10. NAME READY STATUS RESTARTS AGE
  11. httpd-app 1/1 Running 0 4h12m
  12. mcw-depcluster-547cfdc745-258sz 1/1 Running 0 118s
  13. mcw-depcluster-547cfdc745-q2785 1/1 Running 0 118s
  14. mcw-depcluster-547cfdc745-wrq74 1/1 Running 0 118s
  15. mcw01-nginx 1/1 Running 0 63m
  16. mcw01dep-nginx-5dd785954d-sb8ps 1/1 Running 0 61m
  17. mcw1httpd-app 1/1 Running 0 3h42m
  18. nginx-deployment 1/1 Running 0 71m
  19. [machangwei@mcw7 ~]$ kubectl get pod --all-namespaces
  20. NAMESPACE NAME READY STATUS RESTARTS AGE
  21. default httpd-app 1/1 Running 0 4h13m
  22. default mcw-depcluster-547cfdc745-258sz 1/1 Running 0 2m49s
  23. default mcw-depcluster-547cfdc745-q2785 1/1 Running 0 2m49s
  24. default mcw-depcluster-547cfdc745-wrq74 1/1 Running 0 2m49s

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