• kubernetes之标签label

    标签（Labels）是附加到 Kubernetes 对象（比如 Pod）上的键值对。标签使用户能够以松散耦合的方式将他们自己的组织结构映射到系统对象，而无需客户端存储这些映射。

    定义标签

    1. [root@k8s-master1 ~]# kubectl label node k8s-node1 test-label=node-test-label #给node打标签
    2.  
    3. 输出：
    4.  
    5. node/k8s-node1 labeled
    6.  
    7.

    对标签进行筛选

    1. [root@k8s-master1 ~]#  kubectl get no -l test-label=node-test-label 
    2. 输出结果:
    3. NAME        STATUS   ROLES    AGE    VERSION
    4. k8s-node1   Ready    <none>   185d   v1.20.0

    给节点打的标签，可以用于pod部署到指定node上，使用nodeSelector。

    给service打标签

    1. [root@k8s-master1 ~]# kubectl label svc my-nginx test-label=service-my-nginx-label -n default
    2. service/my-nginx labeled

    查看该service的标签

    1. [root@k8s-master1 ~]# kubectl get svc my-nginx -n default --show-labels
    2. NAME       TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE    LABELS
    3. my-nginx   NodePort   10.107.145.148   <none>        80:30474/TCP   185d   app=my-nginx,test-label=service-my-nginx-label

    查看所有service有test-label标签的

    1. [root@k8s-master1 ~]# kubectl get svc -A -l test-label
    2. NAMESPACE   NAME       TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
    3. default     my-nginx   NodePort   10.107.145.148   <none>        80:30474/TCP   185d
    4. [root@k8s-master1 ~]# kubectl get svc -A -l test-label --show-labels
    5. NAMESPACE   NAME       TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE    LABELS
    6. default     my-nginx   NodePort   10.107.145.148   <none>        80:30474/TCP   185d   app=my-nginx,test-label=service-my-nginx-label

    修改标签

    在实际的生产环境中，资源标签的修改是经常发生的事情，使用overwrite参数修改标签

    比如把上面的service my-nginx的test-label的标签值修改为test-test,如果不在overwrite参数，修改会报标签已经存在的错误

    1. [root@k8s-master1 ~]# kubectl label svc my-nginx -n default test-label=test-test
    2. error: 'test-label' already has a value (service-my-nginx-label), and --overwrite is false
    3. [root@k8s-master1 ~]# kubectl label svc my-nginx -n default test-label=test-test --overwrite
    4. service/my-nginx labeled
    5. #确认标签值已经修改
    6. [root@k8s-master1 ~]# kubectl get svc -A -l test-label --show-labels
    7. NAMESPACE   NAME       TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE    LABELS
    8. default     my-nginx   NodePort   10.107.145.148   <none>        80:30474/TCP   185d   app=my-nginx,test-label=test-test
    9.

    删除标签

    删除资源标签，只需要再label的key名后面加一个减号（-）即可，比如删除上面的service my-nginx的test-label标签

    1. [root@k8s-master1 ~]# kubectl get svc -A -l test-label --show-labels
    2. NAMESPACE   NAME       TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE    LABELS
    3. default     my-nginx   NodePort   10.107.145.148   <none>        80:30474/TCP   185d   app=my-nginx,test-label=test-test
    4. [root@k8s-master1 ~]# kubectl label service my-nginx -n default test-label-
    5. service/my-nginx labeled
    6. [root@k8s-master1 ~]# kubectl get svc my-nginx -n default --show-labels
    7. NAME       TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE    LABELS
    8. my-nginx   NodePort   10.107.145.148   <none>        80:30474/TCP   185d   app=my-nginx

    标签选择器

    Selector主要用于资源的匹配，只有符合条件的资源才会被调用或使用，可以使用该方式对集群中的各类资源进行分配。

    1. #查看目前已有的标签
    2. [root@k8s-master1 ~]# kubectl get svc --show-labels
    3. NAME           TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE    LABELS
    4. kubernetes     ClusterIP   10.96.0.1        <none>        443/TCP        186d   component=apiserver,provider=kubernetes
    5. my-nginx       NodePort    10.107.145.148   <none>        80:30474/TCP   185d   app=my-nginx
    6. my-nginx-new   ClusterIP   10.106.218.117   <none>        80/TCP         144d   app=my-nginx
    7.  
    8. #选择匹配app为my-nginx的标签，in (my-nginx，xxx)可以写多个值
    9. [root@k8s-master1 ~]# kubectl get svc -l 'app in (my-nginx)' --show-labels
    10. NAME           TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE    LABELS
    11. my-nginx       NodePort    10.107.145.148   <none>        80:30474/TCP   185d   app=my-nginx
    12. my-nginx-new   ClusterIP   10.106.218.117   <none>        80/TCP         144d   app=my-nginx
    13.  
    14. #匹配选择app不包括my-nginx的对象
    15. [root@k8s-master1 ~]# kubectl get svc -l app!=my-nginx,component=apiserver --show-labels
    16. NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE    LABELS
    17. kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   186d   component=apiserver,provider=kubernetes
    18. [root@k8s-master1 ~]# kubectl get svc -l app!=my-nginx,'component in (apiserver)' --show-labels
    19. NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE    LABELS
    20. kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   186d   component=apiserver,provider=kubernetes
    21.  
    22. #选择匹配key为app的service
    23.  
    24. [root@k8s-master1 ~]# kubectl get svc -l app!=my-nginx,component=apiserver --show-labels
    25. NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE    LABELS
    26. kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   186d   component=apiserver,provider=kubernetes
    27. [root@k8s-master1 ~]# kubectl get svc -l app!=my-nginx,'component in (apiserver)' --show-labels
    28. NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE    LABELS
    29. kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   186d   component=apiserver,provider=kubernetes

    如果是二进制安装的kubernetes，默认的master节点的role字段是空的，通过添加label，添加mater标识

    1. #未打标签之前
    2. [root@k8s-master1 ~]# kubectl get node 
    3. NAME          STATUS   ROLES    AGE    VERSION
    4. k8s-master1   Ready    <none>   185d   v1.20.0
    5. k8s-master2   Ready    <none>   185d   v1.20.0
    6. k8s-master3   Ready    <none>   185d   v1.20.0
    7. k8s-node1     Ready    <none>   185d   v1.20.0
    8. k8s-node2     Ready    <none>   185d   v1.20.0
    9. #打标签
    10. [root@k8s-master1 ~]# kubectl label node k8s-master1 node-role.kubernetes.io/master=master
    11. node/k8s-master1 labeled
    12. #打标签之后，观察ROLES，从原来的<none>变成master
    13. [root@k8s-master1 ~]# kubectl get node 
    14. NAME          STATUS   ROLES    AGE    VERSION
    15. k8s-master1   Ready    master   185d   v1.20.0
    16. k8s-master2   Ready    <none>   185d   v1.20.0
    17. k8s-master3   Ready    <none>   185d   v1.20.0
    18. k8s-node1     Ready    <none>   185d   v1.20.0
    19. k8s-node2     Ready    <none>   185d   v1.20.0

    master的污点

    master的节点的污点，kubeadm安装的集群，默认会在master节点污点k8s-master1 node-role.kubernetes.io/master:NoSchedule,不允许部署非系统pod。二进制安装的默认不会添加，需要手工添加，实现如下

    1. #默认不带污点
    2. [root@k8s-master1 ~]# kubectl describe node -l node-role.kubernetes.io/master | grep -B 3 Taints
    3.                     node.alpha.kubernetes.io/ttl: 0
    4.                     volumes.kubernetes.io/controller-managed-attach-detach: true
    5. CreationTimestamp:  Fri, 04 Mar 2022 10:52:39 +0800
    6. Taints:             <none>
    7. --
    8.                     node.alpha.kubernetes.io/ttl: 0
    9.                     volumes.kubernetes.io/controller-managed-attach-detach: true
    10. CreationTimestamp:  Fri, 04 Mar 2022 10:52:39 +0800
    11. Taints:             <none>
    12. --
    13.                     node.alpha.kubernetes.io/ttl: 0
    14.                     volumes.kubernetes.io/controller-managed-attach-detach: true
    15. CreationTimestamp:  Fri, 04 Mar 2022 10:52:39 +0800
    16. Taints:             <none>
    17. #添加污点
    18. [root@k8s-master1 ~]# kubectl taint node -l node-role.kubernetes.io/master node-role.kubernetes.io/master:NoSchedule
    19. node/k8s-master1 tainted
    20. node/k8s-master2 tainted
    21. node/k8s-master3 tainted
    22. #查看添加结果
    23. [root@k8s-master1 ~]# kubectl describe node -l node-role.kubernetes.io/master | grep -B 3 Taints
    24.                     node.alpha.kubernetes.io/ttl: 0
    25.                     volumes.kubernetes.io/controller-managed-attach-detach: true
    26. CreationTimestamp:  Fri, 04 Mar 2022 10:52:39 +0800
    27. Taints:             node-role.kubernetes.io/master:NoSchedule
    28. --
    29.                     node.alpha.kubernetes.io/ttl: 0
    30.                     volumes.kubernetes.io/controller-managed-attach-detach: true
    31. CreationTimestamp:  Fri, 04 Mar 2022 10:52:39 +0800
    32. Taints:             node-role.kubernetes.io/master:NoSchedule
    33. --
    34.                     node.alpha.kubernetes.io/ttl: 0
    35.                     volumes.kubernetes.io/controller-managed-attach-detach: true
    36. CreationTimestamp:  Fri, 04 Mar 2022 10:52:39 +0800
    37. Taints:             node-role.kubernetes.io/master:NoSchedule
    38.  
    39. 删除污点
    40. [root@k8s-master1 ~]# kubectl taint node -l node-role.kubernetes.io/master node-role.kubernetes.io/master:NoSchedule-
    41. node/k8s-master1 untainted
    42. node/k8s-master2 untainted
    43. node/k8s-master3 untainted
    44. #查看删除结果
    45. [root@k8s-master1 ~]# kubectl describe node -l node-role.kubernetes.io/master | grep -B 3 Taints
    46.                     node.alpha.kubernetes.io/ttl: 0
    47.                     volumes.kubernetes.io/controller-managed-attach-detach: true
    48. CreationTimestamp:  Fri, 04 Mar 2022 10:52:39 +0800
    49. Taints:             <none>
    50. --
    51.                     node.alpha.kubernetes.io/ttl: 0
    52.                     volumes.kubernetes.io/controller-managed-attach-detach: true
    53. CreationTimestamp:  Fri, 04 Mar 2022 10:52:39 +0800
    54. Taints:             <none>
    55. --
    56.                     node.alpha.kubernetes.io/ttl: 0
    57.                     volumes.kubernetes.io/controller-managed-attach-detach: true
    58. CreationTimestamp:  Fri, 04 Mar 2022 10:52:39 +0800
    59. Taints:             <none>
    60.  
    61.  
    62.  
    63. #单个节点添加污点
    64. kubectl taint node k8s-master1 node-role.kubernetes.io/master:NoSchedule
    65.  
    66. #单个节点删除污点
    67. kubectl taint node k8s-master1 node-role.kubernetes.io/master:NoSchedule-

  • 相关阅读:
    JVM思维导图
    更新.gitmodules的子模块仓库地址，但是没有生效，需要运行命令
    复杂网络 | 利用复杂网络预测城市空间流量
    【PTA】《数据结构与算法》线性结构复习题
    在 Amazon 搭建无代码可视化的数据分析和建模平台
    监听和获取LayerUI中的switch值
    如何理解es6的迭代器？
    前端字体压缩（免费简单易上手）
    Java 基础语法
    vue2中使用quill编辑器+表格功能
  • 原文地址：https://blog.csdn.net/rendongxingzhe/article/details/126720338