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一般用于去存储 Pod 中应用所需的一些配置信息#xff0c;或者环境变量#xff0c;将配置于 Pod 分开#xff0c;避免应为修改配置导致还需要重新构建 镜像与容器。
1 创建ConfigMap
#使用 kubectl create configmap -h 查看示例#xff0c;构建 configmap 对象…回到目录
一般用于去存储 Pod 中应用所需的一些配置信息或者环境变量将配置于 Pod 分开避免应为修改配置导致还需要重新构建 镜像与容器。
1 创建ConfigMap
#使用 kubectl create configmap -h 查看示例构建 configmap 对象
Examples:# Create a new config map named my-config based on folder barkubectl create configmap my-config --from-filepath/to/bar# Create a new config map named my-config with specified keys instead of file basenames on diskkubectl create configmap my-config --from-filekey1/path/to/bar/file1.txt --from-filekey2/path/to/bar/file2.txt# Create a new config map named my-config with key1config1 and key2config2kubectl create configmap my-config --from-literalkey1config1 --from-literalkey2config2# Create a new config map named my-config from the keyvalue pairs in the filekubectl create configmap my-config --from-filepath/to/bar# Create a new config map named my-config from an env filekubectl create configmap my-config --from-env-filepath/to/foo.env --from-env-filepath/to/bar.env
1.1 将指定目录下所有文件加载到配置文件中
# Create a new config map named my-config based on folder bar
# kubectl create configmap my-config --from-filepath/to/bar
#example:
#在test目录下有两个配置文件db.properties redis.properties#1.创建configmap名字为test-cm从test目录下加载
[rootk8s-master1 configmap]# kubectl create cm test-cm --from-filetest/
configmap/test-cm created#2.查看configmap
[rootk8s-master1 configmap]# kubectl get cm
NAME DATA AGE
kube-root-ca.crt 1 5d9h #k8s默认的认证
test-cm 2 7s #我们创建的#3.查看test-cm的详细信息
[rootk8s-master1 configmap]# kubectl describe cm test-cm
#内容如下
Name: test-cm
Namespace: default
Labels: none
Annotations: noneDatadb.properties: #key
----
username: root
password: 1234redis.properties:
----
port: 6379BinaryData
Events: none
1.2 指定一个或多个文件和key
# Create a new config map named my-config with specified keys instead of file basenames on disk
# kubectl create configmap my-config --from-filekey1/path/to/bar/file1.txt --from-filekey2/path/to/bar/file2.txt#指定一个或多个文件不加key时以文件名作为key#example#创建configmap名称为testfile-cm从指定的test目录下的db.properties加载
[rootk8s-master1 configmap]# kubectl create cm testfile-cm --from-filetest/db.properties
configmap/testfile-cm created#查看configmap
[rootk8s-master1 configmap]# kubectl get cm
NAME DATA AGE
kube-root-ca.crt 1 5d10h
testfile-cm 1 5s#查看详情
[rootk8s-master1 configmap]# kubectl describe cm testfile-cm
Name: testfile-cm
Namespace: default
Labels: none
Annotations: noneDatadb.properties: #不指定key以文件名为key如果指定则以具体指定作为key
----
username: root
password: 1234BinaryData
Events: none
1.3 命令上手动添加key-value
# Create a new config map named my-config with key1config1 and key2config2
#kubectl create configmap my-config --from-literalkey1config1 --from-literalkey2config2#直接写入key和value#example#创建configmap名称为test-cm手动添加keyuservaluerootkeypasswordvalue1234
[rootk8s-master1 configmap]# kubectl create cm test-cm --from-literaluserroot --from-literalpassword1234
configmap/test-cm created
[rootk8s-master1 configmap]# kubectl get cm
NAME DATA AGE
kube-root-ca.crt 1 5d10h
test-cm 2 7s
[rootk8s-master1 configmap]# kubectl describe cm test-cm
Name: test-cm
Namespace: default
Labels: none
Annotations: noneDatapassword: #key
----
1234 #value
user: #key
----
root #valueBinaryData
Events: none
2 configmap的使用 在pod中 将configmap中的数据设置为容器的环境变量 将ConfigMap中的数据设置为命令行参数 使用Volume将ConfigMap作为文件或目录挂载 编写代码在 Pod 中运行使用 Kubernetes API 来读取 ConfigMap 将configmap挂载到容器中configmap变化容器自动更新
而 写入环境变量不会自动更新
2.1 配置到容器的环境变量中
# test-pod-configmap.yaml
apiVersion: v1
kind: Pod
metadata:name: test-pod-configmap
spec:containers:- name: test-busyboximage: busyboximagePullPolicy: IfNotPresentargs:- sleep- 86400env: # env配置容器环境变量- name: KEY1 # 容器环境变量key为key1valueFrom: # value内容configMapKeyRef: # 通过configmap的key映射name: my-config # configmap的名称key: key1 # configmap中的key- name: KEY2valueFrom:configMapKeyRef:name: my-configkey: key2
2.2 设置为命令行参数
# test-pod-configmap-cmd
apiVersion: v1
kind: Pod
metadata:name: test-pod-configmap-cmd
spec:containers:- name: test-busyboximage: busyboximagePullPolicy: IfNotPresentcommand: [ /bin/sh,-c,echo $(KEY1) $(KEY2)]env:- name: KEY1valueFrom:configMapKeyRef:name: my-configkey: key1- name: KEY2valueFrom:configMapKeyRef:name: my-configkey: key2restartPolicy: Never
2.3 将configmap挂载到容器中
# test-pod-projected-configmap-volume.yaml
apiVersion: v1
kind: Pod
metadata:name: test-pod-projected-configmap-volume
spec:containers:- name: test-pod-busyboximage: busyboximagePullPolicy: IfNotPresentargs:- sleep- 86400volumeMounts: # 挂载- name: config-volume # 挂载的数据卷名mountPath: /projected-volume # 挂载到哪的路径readOnly: true # 只读权限volumes: # 数据卷- name: config-volume # 数据卷名称projected:sources:- configMap: # 数据卷为configmapname: my-config # 数据卷名
