《Kubernetes进阶实战》第八章《配置容器应用：ConfigMap和Secret》

古城微笑少年丶 2022-03-25 08:46 192阅读 0赞

## configmap和secret ##

**PV和PVC是借助于StorageClass来分配磁盘的  
如何给Pod传配置信息：  
两种方式：**

*  **1.把configmap关联到一个pod上，传递给pod内部的一个变量，注入的方式给容器传配置信息**
 *  **2.配置卷，将配置文件映射到外面的路径**

**configmap在kubernetes上扮演了kubernetes的配置中心的功能  
Pod启动时候讲configmap打包为存储卷，挂载到配置文件的路径下  
configmap是明文的信息  
secret是密文传递的，功能和configmap一样的  
配置容器化应用的方式：  
1，自定义命令行参数  
command  
args  
2,把配置文件直接add进镜像，不推荐  
3，环境变量(类似docker)  
1，Cloud native的应用创徐一般可以直接通过环境变量加载配置  
2，通过entrypoint脚本来预处理变量为配置文件中的配置信息  
4.存储卷  
pod资源环境变量的传递方式  
一个configmap是一群pod的配置集合  
保存的方式key，vallue**

**StorageClass**

在pv和pvc使用过程中存在的问题，在pvc申请存储空间时，未必就有现成的pv符合pvc申请的需求，上面nfs在做pvc可以成功的因素是因为我们做了指定的需求处理。那么当PVC申请的存储空间不一定有满足PVC要求的PV事，又该如何处理呢？？？为此，Kubernetes为管理员提供了描述存储"class（类）"的方法（StorageClass）。举个例子，在存储系统中划分一个1TB的存储空间提供给Kubernetes使用，当用户需要一个10G的PVC时，会立即通过restful发送请求，从而让存储空间创建一个10G的image，之后在我们的集群中定义成10G的PV供给给当前的PVC作为挂载使用。在此之前我们的存储系统必须支持restful接口，比如ceph分布式存储，而glusterfs则需要借助第三方接口完成这样的请求。如图：  
![1349539-20181010160310479-848300996.png][]

[root@master ~]# kubectl explain storageclass 
    KIND:     StorageClass
    VERSION:  storage.k8s.io/v1
    
    DESCRIPTION:
         StorageClass describes the parameters for a class of storage for which
         PersistentVolumes can be dynamically provisioned. StorageClasses are
         non-namespaced; the name of the storage class according to etcd is in
         ObjectMeta.Name.
    
    FIELDS:
       allowVolumeExpansion	<boolean>
         AllowVolumeExpansion shows whether the storage class allow volume expand
    
       allowedTopologies	<[]Object>
         Restrict the node topologies where volumes can be dynamically provisioned.
         Each volume plugin defines its own supported topology specifications. An
         empty TopologySelectorTerm list means there is no topology restriction.
         This field is only honored by servers that enable the VolumeScheduling
         feature.
    
       apiVersion	<string>
         APIVersion defines the versioned schema of this representation of an
         object. Servers should convert recognized schemas to the latest internal
         value, and may reject unrecognized values. More info:
         https://git.k8s.io/community/contributors/devel/api-conventions.md#resources
    
       kind	<string>
         Kind is a string value representing the REST resource this object
         represents. Servers may infer this from the endpoint the client submits
         requests to. Cannot be updated. In CamelCase. More info:
         https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds
    
       metadata	<Object>
         Standard object's metadata. More info:
         https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata
    
       mountOptions	<[]string>
         Dynamically provisioned PersistentVolumes of this storage class are created
         with these mountOptions, e.g. ["ro", "soft"]. Not validated - mount of the
         PVs will simply fail if one is invalid.
    
       parameters	<map[string]string>
         Parameters holds the parameters for the provisioner that should create
         volumes of this storage class.
    
       provisioner	<string> -required-
         Provisioner indicates the type of the provisioner.
    
       reclaimPolicy	<string>
         Dynamically provisioned PersistentVolumes of this storage class are created
         with this reclaimPolicy. Defaults to Delete.
    
       volumeBindingMode	<string>
         VolumeBindingMode indicates how PersistentVolumeClaims should be
         provisioned and bound. When unset, VolumeBindingImmediate is used. This
         field is only honored by servers that enable the VolumeScheduling feature.

**configmap**

[root@master ~]# kubectl create configmap --help
    Create a configmap based on a file, directory, or specified literal value. 
    
    A single configmap may package one or more key/value pairs. 
    
    When creating a configmap based on a file, the key will default to the basename of the file, and the value will default
    to the file content.  If the basename is an invalid key, you may specify an alternate key. 
    
    When creating a configmap based on a directory, each file whose basename is a valid key in the directory will be
    packaged into the configmap.  Any directory entries except regular files are ignored (e.g. subdirectories, symlinks,
    devices, pipes, etc).
    
    Aliases:
    configmap, cm
    
    Examples:
      # Create a new configmap named my-config based on folder bar
      kubectl create configmap my-config --from-file=path/to/bar
      
      # Create a new configmap named my-config with specified keys instead of file basenames on disk
      kubectl create configmap my-config --from-file=key1=/path/to/bar/file1.txt --from-file=key2=/path/to/bar/file2.txt
      
      # Create a new configmap named my-config with key1=config1 and key2=config2
      kubectl create configmap my-config --from-literal=key1=config1 --from-literal=key2=config2
      
      # Create a new configmap named my-config from the key=value pairs in the file
      kubectl create configmap my-config --from-file=path/to/bar
      
      # Create a new configmap named my-config from an env file
      kubectl create configmap my-config --from-env-file=path/to/bar.env
    
    Options:
          --allow-missing-template-keys=true: If true, ignore any errors in templates when a field or map key is missing in
    the template. Only applies to golang and jsonpath output formats.
          --append-hash=false: Append a hash of the configmap to its name.
          --dry-run=false: If true, only print the object that would be sent, without sending it.
          --from-env-file='': Specify the path to a file to read lines of key=val pairs to create a configmap (i.e. a Docker
    .env file).
          --from-file=[]: Key file can be specified using its file path, in which case file basename will be used as
    configmap key, or optionally with a key and file path, in which case the given key will be used.  Specifying a directory
    will iterate each named file in the directory whose basename is a valid configmap key.
          --from-literal=[]: Specify a key and literal value to insert in configmap (i.e. mykey=somevalue)
          --generator='configmap/v1': The name of the API generator to use.
      -o, --output='': Output format. One of:
    json|yaml|name|go-template|go-template-file|template|templatefile|jsonpath|jsonpath-file.
          --save-config=false: If true, the configuration of current object will be saved in its annotation. Otherwise, the
    annotation will be unchanged. This flag is useful when you want to perform kubectl apply on this object in the future.
          --template='': Template string or path to template file to use when -o=go-template, -o=go-template-file. The
    template format is golang templates [http://golang.org/pkg/text/template/#pkg-overview].
          --validate=true: If true, use a schema to validate the input before sending it
    
    Usage:
      kubectl create configmap NAME [--from-file=[key=]source] [--from-literal=key1=value1] [--dry-run] [options]
    
    Use "kubectl options" for a list of global command-line options (applies to all commands).
    [root@master ~]#

**命令模式创建**

开始创建配置文件
    [root@master ~]# kubectl create configmap nginx-config --from-literal=nginx_port=80 --from-literal=server_name=myapp.node1.com
    configmap/nginx-config created
    
    查看创建的配置信息
    [root@master ~]# kubectl get cm
    NAME           DATA   AGE
    nginx-config   2      13s
    
    查看创建的具体信息
    [root@master ~]# kubectl describe cm nginx-config
    Name:         nginx-config
    Namespace:    default
    Labels:       <none>
    Annotations:  <none>
    
    Data
    ====
    nginx_port:
    ----
    80
    server_name:
    ----
    myapp.node1.com
    Events:  <none>
    注：这个configmap就可以被Pod启动的时候调用了
    
    创建一个nginx配置
    [root@master ~]# vim www.conf
    [root@master ~]# kubectl create configmap nginx-www --from-file=www=./www.conf
    configmap/nginx-www created
    [root@master ~]# kubectl get cm
    NAME           DATA   AGE
    nginx-config   2      85s
    nginx-www      1      4s
    [root@master ~]# kubectl get cm nginx-www -o yaml
    apiVersion: v1
    data:
      www: ""
    kind: ConfigMap
    metadata:
      creationTimestamp: "2019-02-24T01:03:29Z"
      name: nginx-www
      namespace: default
      resourceVersion: "22038"
      selfLink: /api/v1/namespaces/default/configmaps/nginx-www
      uid: ff54810b-37cf-11e9-b791-000c297bb055
    [root@master ~]# vim www.conf
    [root@master ~]# cat www.conf 
    server {
       server_name jesse.com
       listen 80
       root /data/web/html/;
    }
    
    [root@master ~]# kubectl create configmap nginx-www --from-file=www=./www.conf
    configmap/nginx-www created
    [root@master ~]# kubectl get cm nginx-www -o yaml
    apiVersion: v1
    data:
      www: |
        server {
           server_name jesse.com
           listen 80
           root /data/web/html/;
        }
    kind: ConfigMap
    metadata:
      creationTimestamp: "2019-02-24T01:05:01Z"
      name: nginx-www
      namespace: default
      resourceVersion: "22171"
      selfLink: /api/v1/namespaces/default/configmaps/nginx-www
      uid: 36330257-37d0-11e9-b791-000c297bb055
    [root@master ~]# kubectl describe cm nginx-www
    Name:         nginx-www
    Namespace:    default
    Labels:       <none>
    Annotations:  <none>
    
    Data
    ====
    www:
    ----
    server {
       server_name jesse.com
       listen 80
       root /data/web/html/;
    }
    
    Events:  <none>

**创建yaml文件**

[root@master ~]# mkdir configmap
    [root@master ~]# cd configmap
    [root@master configmap]# vim pod-configmap.yaml
    [root@master configmap]# cat pod-configmap.yaml 
    #**************************************************************
    #Author:                     linkun
    #QQ:                         2********0
    #Date:                       2019-02-24
    #FileName:                   pod-configmap.yaml
    #URL:                        https://blog.csdn.net/zisefeizhu
    #Description:                 The test script
    #Copyright (C):             2019 All rights reserved
    #************************************************************
    apiVersion: v1
    kind: Pod
    metadata:
      name: pod-cm-1
      namespace: default
      labels:
        app: myapp
        tier: frontend
      annotations:
        node01/create-by: "cluster admin"
    spec:
      containers:
      - name: myapp
        image: ikubernetes/myapp:v1
        ports:
        - name: http
          containerPort: 80
        env:
        - name: NGINX_SERVER_PORT
          valueFrom:
            configMapKeyRef:
              name: nginx-config
              key: nginx_port
        - name: NGINX_SERVER_NAME
          valueFrom:
            configMapKeyRef:
              name: nginx-config
              key: server_name
    
    [root@master configmap]# kubectl apply -f pod-configmap.yaml 
    pod/pod-cm-1 created
    
    [root@master configmap]# kubectl get pods
    NAME               READY   STATUS    RESTARTS   AGE
    pod-cm-1           1/1     Running   0          4s
    
    进入容器中查看是否在环境变量中生成成功
    [root@master configmap]# kubectl exec -it pod-cm-1 /bin/sh
    / # printenv 
    MYAPP_SVC_PORT_80_TCP_ADDR=10.98.57.156
    KUBERNETES_PORT=tcp://10.96.0.1:443
    KUBERNETES_SERVICE_PORT=443
    MYAPP_SVC_PORT_80_TCP_PORT=80
    HOSTNAME=pod-cm-1             生成数据
    SHLVL=1
    MYAPP_SVC_PORT_80_TCP_PROTO=tcp
    HOME=/root
    NGINX_SERVER_PORT=80           生成端口
    NGINX_SERVER_NAME=myapp.node1.com            自己定义的主机名
    MYAPP_SVC_PORT_80_TCP=tcp://10.98.57.156:80
    TERM=xterm
    NGINX_VERSION=1.12.2
    KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
    PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    KUBERNETES_PORT_443_TCP_PORT=443
    KUBERNETES_PORT_443_TCP_PROTO=tcp
    MYAPP_SVC_SERVICE_HOST=10.98.57.156
    KUBERNETES_SERVICE_PORT_HTTPS=443
    KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443
    PWD=/
    KUBERNETES_SERVICE_HOST=10.96.0.1
    MYAPP_SVC_SERVICE_PORT=80
    MYAPP_SVC_PORT=tcp://10.98.57.156:80

**注：通过上面已经说明，环境信息已经注入**

**如果更改掉配置，看看是否会生效**

[root@master configmap]# kubectl edit cm nginx-config
    configmap/nginx-config edited
     
    apiVersion: v1
    data:
      nginx_port: "8080"   #更改后的端口
      server_name: myapp.node1.com
    
    configmap/nginx-config edited
    
    [root@master configmap]# kubectl describe cm nginx-config
    Name:         nginx-config
    Namespace:    default
    Labels:       <none>
    Annotations:  <none>
    
    Data
    ====
    nginx_port:
    ----
    8080
    server_name:
    ----
    myapp.node1.com
    Events:  <none>
    [root@master configmap]# kubectl exec -it pod-cm-1 /bin/sh
    / # printenv 
    MYAPP_SVC_PORT_80_TCP_ADDR=10.98.57.156
    KUBERNETES_PORT=tcp://10.96.0.1:443
    KUBERNETES_SERVICE_PORT=443
    MYAPP_SVC_PORT_80_TCP_PORT=80
    HOSTNAME=pod-cm-1
    SHLVL=1
    MYAPP_SVC_PORT_80_TCP_PROTO=tcp
    HOME=/root
    NGINX_SERVER_PORT=80              发现没有改变
    NGINX_SERVER_NAME=myapp.node1.com
    MYAPP_SVC_PORT_80_TCP=tcp://10.98.57.156:80
    TERM=xterm
    NGINX_VERSION=1.12.2
    KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
    PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    KUBERNETES_PORT_443_TCP_PORT=443
    KUBERNETES_PORT_443_TCP_PROTO=tcp
    MYAPP_SVC_SERVICE_HOST=10.98.57.156
    KUBERNETES_SERVICE_PORT_HTTPS=443
    KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443
    PWD=/
    KUBERNETES_SERVICE_HOST=10.96.0.1
    MYAPP_SVC_SERVICE_PORT=80
    MYAPP_SVC_PORT=tcp://10.98.57.156:80

**注：也就是说，当我们使用系统变量时，只在系统的启动时才会有效，如果我们使用存储卷的方式是可以随时改变的**

**使用存储卷的方式**

[root@master configmap]# kubectl delete pods pod-cm-1
    pod "pod-cm-1" deleted
    [root@master configmap]# cp pod-configmap.yaml pod-configmap-2.yaml 
    [root@master configmap]# vim pod-configmap-2.yaml
    [root@master configmap]# cat pod-configmap-2.yaml
    #**************************************************************
    #Author:                     linkun
    #QQ:                         2********0
    #Date:                       2019-02-24
    #FileName:                   pod-configmap.yaml
    #URL:                        https://blog.csdn.net/zisefeizhu
    #Description:                 The test script
    #Copyright (C):             2019 All rights reserved
    #************************************************************
    apiVersion: v1
    kind: Pod
    metadata:
      name: pod-cm-2
      namespace: default
      labels:
        app: myapp
        tier: frontend
      annotations:
        node01/create-by: "cluster admin"
    spec:
      containers:
      - name: myapp
        image: ikubernetes/myapp:v1
        ports:
        - name: http
          containerPort: 80
        volumeMounts:                  修改点
        - name: nginxconf
          mountPath: /etc/nginx/config.d/
          readOnly: true
      volumes:
      - name: nginxconf
        configMap:
          name: nginx-config
    [root@master configmap]# kubectl apply -f pod-configmap-2.yaml 
    pod/pod-cm-2 created
    
    [root@master configmap]# kubectl get pods
    NAME               READY   STATUS    RESTARTS   AGE
    pod-cm-2           1/1     Running   0          4s
    
    进入容器查看状态
    [root@master configmap]# kubectl exec -it pod-cm-2  /bin/sh
    / # cd /etc/nginx/config.d/
    /etc/nginx/config.d # ls
    nginx_port   server_name
    /etc/nginx/config.d # cat nginx_port 
    /etc/nginx/config.d # cat nginx_port 
    
    动态更改配置
    [root@master ~]# kubectl edit cm nginx-config
    
    # Please edit the object below. Lines beginning with a '#' will be ignored,
    # and an empty file will abort the edit. If an error occurs while saving this file will be
    # reopened with the relevant failures.
    #
    apiVersion: v1
    data:
      nginx_port: "8088"
    [root@master ~]# kubectl edit cm nginx-config
    configmap/nginx-config edited
    
    /etc/nginx/config.d # cat nginx_port 
    8080
    
    经改过来了，同步需要几秒钟
    /etc/nginx/config.d # cat  nginx_port 
    8088/etc/nginx/config.d # ls -l
    total 0
    lrwxrwxrwx    1 root     root            17 Feb 24 01:34 nginx_port -> ..data/nginx_port
    lrwxrwxrwx    1 root     root            18 Feb 24 01:34 server_name -> ..data/server_name

**注：同步到apiserver -->pod中**

## 利用configmap和nginx建站 ##

[root@master configmap]# cp pod-configmap-2.yaml  pod-configmap-3.yaml 
    [root@master configmap]# vim pod-configmap-3.yaml
    [root@master configmap]# cat pod-configmap-3.yaml 
    #**************************************************************
    #Author:                     linkun
    #QQ:                         2********0
    #Date:                       2019-02-24
    #FileName:                   pod-configmap.yaml
    #URL:                        https://blog.csdn.net/zisefeizhu
    #Description:                 The test script
    #Copyright (C):             2019 All rights reserved
    #************************************************************
    apiVersion: v1
    kind: Pod
    metadata:
      name: pod-cm-3    #修改点
      namespace: default
      labels:
        app: myapp
        tier: frontend
      annotations:
        node01/create-by: "cluster admin"
    spec:
      containers:
      - name: myapp
        image: ikubernetes/myapp:v1
        ports:
        - name: http
          containerPort: 80
        volumeMounts:
        - name: nginxconf
          mountPath: /etc/nginx/conf.d/  #修改点
          readOnly: true
      volumes:
      - name: nginxconf
        configMap:
          name: nginx-www  #修改点
    
    [root@master ~]# kubectl delete cm nginx-www
    configmap "nginx-www" deleted
    [root@master ~]# cat www.conf 
    server {
        server_name zisefeizhu.com
        listen 80;
        root /data/web/html/;
    }
    [root@master ~]# kubectl create configmap nginx-www --from-file=./www.conf
    configmap/nginx-www created
    [root@master ~]# kubectl get cm
    NAME           DATA   AGE
    nginx-config   2      74m
    nginx-www      1      2s
    
    [root@master configmap]# kubectl apply -f pod-configmap-3.yaml 
    pod/pod-cm-3 created
    [root@master configmap]# kubectl get pods
    NAME               READY   STATUS    RESTARTS   AGE
    pod-cm-3           1/1     Running   0          5s
    [root@master configmap]# kubectl exec -it pod-cm-3 /bin/sh
    / # cd /etc/nginx/conf.d/
    /etc/nginx/conf.d # ls
    www.conf
    /etc/nginx/conf.d # cat www.conf 
    server {
        server_name zisefeizhu
        listen 80;
        root /data/web/html/;
    }
     
    查看nginx的配置
    nginx -T
    mkdir /data/web/html -p
    vi /data/web/html/index.html    
    <h1>Test Nginx </h1>
      
    [root@master configmap]# kubectl get pods -o wide
    NAME       READY     STATUS    RESTARTS   AGE       IP            NODE      NOMINATED NODE
    pod-cm-23   1/1       Running   0          7m        10.244.2.62   node02     <none>
     
    在node01上测试，添加zisefeizhu10.244.2.62 到解析文件/etc/hosts
    [root@node01 ~]# curl zisefeizhu.com
    <h1>Test Nginx<h1>
     
     
    [root@master configmap]# kubectl edit cm nginx-www
    更改端口8080
    apiVersion: v1
    data:
      www.conf: |
        server {
            server_name zisefeizhu.com
            listen 8080;
            root /data/web/html/;
        }
    kind: ConfigMap
     
    在容器内部查看是否生效：
    /etc/nginx/conf.d # cat www.conf 
    server {
        server_name jesse.com
        listen 8080;
        root /data/web/html/;
    }
     
     
    在容器内查看端口：
    /etc/nginx/conf.d # netstat -tnl
    Active Internet connections (only servers)
    Proto Recv-Q Send-Q Local Address           Foreign Address         State       
    tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      
     
    重载一下nginx配置文件
    nginx -s reload

## 存储卷挂载 ##

[root@master ~]# kubectl explain pods.spec.volumes.configMap.items
    KIND:     Pod
    VERSION:  v1
    
    RESOURCE: items <[]Object>
    
    DESCRIPTION:
         If unspecified, each key-value pair in the Data field of the referenced
         ConfigMap will be projected into the volume as a file whose name is the key
         and content is the value. If specified, the listed keys will be projected
         into the specified paths, and unlisted keys will not be present. If a key
         is specified which is not present in the ConfigMap, the volume setup will
         error unless it is marked optional. Paths must be relative and may not
         contain the '..' path or start with '..'.
    
         Maps a string key to a path within a volume.
    
    FIELDS:
       key	<string> -required-
         The key to project.
    
       mode	<integer>
         Optional: mode bits to use on this file, must be a value between 0 and
         0777. If not specified, the volume defaultMode will be used. This might be
         in conflict with other options that affect the file mode, like fsGroup, and
         the result can be other mode bits set.
    
       path	<string> -required-
         The relative path of the file to map the key to. May not be an absolute
         path. May not contain the path element '..'. May not start with the string
         '..'.

**secret**

[root@master ~]# kubectl create secret generic mysql-root-password --from-literal=password=zisefeizhu@com
    secret/mysql-root-password created
    [root@master ~]# kubectl get secret
    NAME                  TYPE                                  DATA   AGE
    default-token-h8l2m   kubernetes.io/service-account-token   3      5d23h
    mysql-root-password   Opaque                                1      23s
    [root@master ~]#  kubectl describe secret mysql-root-password
    Name:         mysql-root-password
    Namespace:    default
    Labels:       <none>
    Annotations:  <none>
    
    Type:  Opaque
    
    Data
    ====
    password:  14 bytes
    [root@master ~]# kubectl get secret mysql-root-password
    NAME                  TYPE     DATA   AGE
    mysql-root-password   Opaque   1      46s
    [root@master ~]# kubectl get secret mysql-root-password -o yaml
    apiVersion: v1
    data:
      password: emlzZWZlaXpodUBjb20=
    kind: Secret
    metadata:
      creationTimestamp: "2019-02-24T02:25:15Z"
      name: mysql-root-password
      namespace: default
      resourceVersion: "29115"
      selfLink: /api/v1/namespaces/default/secrets/mysql-root-password
      uid: 6b64abc8-37db-11e9-b791-000c297bb055
    type: Opaque
    
    解码
    [root@master ~]# echo emlzZWZlaXpodUBjb20= |base64 -d
    zisefeizhu@com

**获取环境变量**

[root@master ~]# cd configmap/
    [root@master configmap]# vim pod-secret-1.yaml
    [root@master configmap]# cat pod-secret-1.yaml
    #**************************************************************
    #Author:                     linkun
    #QQ:                         2********0
    #Date:                       2019-02-24
    #FileName:                   pod-secret-1.yaml
    #URL:                        https://blog.csdn.net/zisefeizhu
    #Description:                 The test script
    #Copyright (C):             2019 All rights reserved
    #************************************************************
    apiVersion: v1
    kind: Pod
    metadata:
      name: pod-secret-1
      namespace: default
      labels:
        app: myapp
        tier: frontend
      annotations:
        zpx.com/create-by: "cluster admin"
    spec:
      containers:
      - name: myapp
        image: ikubernetes/myapp:v1
        ports:
        - name: http
          containerPort: 80
        env:
        - name: mYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-root-password
              key: password
    [root@master configmap]# kubectl apply -f pod-secret-1.yaml 
    pod/pod-secret-1 created
    [root@master configmap]# kubectl get pods
    NAME               READY   STATUS    RESTARTS   AGE
    pod-secret-1       1/1     Running   0          5s
    [root@master configmap]# kubectl exec pod-secret-1 -- printenv
    PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    HOSTNAME=pod-secret-1
    mYSQL_ROOT_PASSWORD=zisefeizhu@com
    KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
    KUBERNETES_SERVICE_HOST=10.96.0.1
    KUBERNETES_SERVICE_PORT=443
    KUBERNETES_SERVICE_PORT_HTTPS=443
    KUBERNETES_PORT=tcp://10.96.0.1:443
    KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443
    KUBERNETES_PORT_443_TCP_PROTO=tcp
    KUBERNETES_PORT_443_TCP_PORT=443
    MYAPP_SVC_PORT_80_TCP_PROTO=tcp
    MYAPP_SVC_PORT=tcp://10.98.57.156:80
    MYAPP_SVC_PORT_80_TCP_ADDR=10.98.57.156
    MYAPP_SVC_SERVICE_HOST=10.98.57.156
    MYAPP_SVC_SERVICE_PORT=80
    MYAPP_SVC_PORT_80_TCP=tcp://10.98.57.156:80
    MYAPP_SVC_PORT_80_TCP_PORT=80
    NGINX_VERSION=1.12.2
    HOME=/root

[1349539-20181010160310479-848300996.png]: /images/20220325/4a5144b346f24e4ea863cd5397be486e.png