configMap is a quick way to modify the variables of the container, the composition kv, when modifying configmap container variable is also changed accordingly.
Our help documentation
[root@node-1 ~]# kubectl explain pod.spec.containers.env.valueFrom.configMapKeyRef
[root@node-1 ~]# kubectl explain configmapconfigmap can be ordered directly create value can also be saved to a file, the file named key, the contents of the file to value.
directly with the command:
[root@node-1 ~]# kubectl create configmap --help
kubectl create configmap nginx-nc --from-literal=nginx_port=80 --from-literal=nginx_server=erick.com
查看创建的cm
[root@node-1 ~]# kubectl get cm
NAME DATA AGE
nginx-nc 2 60s
[root@node-1 cm]# kubectl get cm nginx-nc -o yaml
apiVersion: v1
data:
nginx_port: "80"
nginx_server: erick.com
kind: ConfigMap
metadata:
creationTimestamp: "2019-06-20T22:34:44Z"
name: nginx-nc
namespace: default
resourceVersion: "432545"
selfLink: /api/v1/namespaces/default/configmaps/nginx-nc
uid: 9a180b6e-93ab-11e9-b0ae-080027edb92f
[root@node-1 cm]# The value stored in files
[root@node-1 cm]# cat www.conf
server {
server_name myapp.com;
port 80;
root /data/web/html;
}
[root@node-1 cm]# kubectl create configmap nginx-cm-from-file --from-file=./www.conf
configmap/nginx-cm-from-file created
[root@node-1 cm]# kubectl get cm
NAME DATA AGE
nginx-cm-from-file 1 7s
nginx-nc 2 9m7s
[root@node-1 cm]# kubectl get cm nginx-cm-from-file -o yaml
apiVersion: v1
data:
www.conf: "server {\n\tserver_name myapp.com;\n\tport 80;\n\troot /data/web/html;\n\n}\n"
kind: ConfigMap
metadata:
creationTimestamp: "2019-06-20T22:43:44Z"
name: nginx-cm-from-file
namespace: default
resourceVersion: "433432"
selfLink: /api/v1/namespaces/default/configmaps/nginx-cm-from-file
uid: dbd2aa33-93ac-11e9-b0ae-080027edb92f
[root@node-1 cm]#
也可以用describe 看
[root@node-1 cm]# kubectl describe cm nginx-nc
Name: nginx-nc
Namespace: default
Labels: <none>
Annotations: <none>
Data
====
nginx_port:
----
80
nginx_server:
----
erick.com
Events: <none>
[root@node-1 cm]# kubectl describe cm nginx-cm-from-file
Name: nginx-cm-from-file
Namespace: default
Labels: <none>
Annotations: <none>
Data
====
www.conf:
----
server {
server_name myapp.com;
port 80;
root /data/web/html;
}
Events: <none>Created in this way can be seen, key for the file name, key to the contents of the file.
Creating a pod association just created cm
[root @ the Node-1 cm] # CAT cm-1.yml
apiVersion: v1
kind: Pod
the Metadata:
name: myapp-cm-1
namespace: default
Annotations:
Erick: "Erick by"
spec :
Containers:
- name: myapp-cm-1
image: ikubernetes/myapp:v1
ports:- name: http
containerPort: 80
env: - name: nginx_port
valueFrom:
configMapKeyRef:
name: nginx-nc
key: nginx_port - name: nginx_server
valueFrom:
configMapKeyRef:
name: nginx-nc
key: nginx_server
- name: http
[root@node-1 cm]#
See into the container and the environment variables
[the root-Node. 1 cm & lt @] GET # kubectl POD
NAME RESTARTS of AGE the STATUS READY
MyApp-Running 1/1. 1 0-cm & lt 2m16s
[the root-Node. 1 cm & lt @] # kubectl Exec Expediting IT-cm & lt MyApp -1 - / bin / SH
/ # the env | grep nginx_port
nginx_port = 80
/ # the env | grep nginx_server
nginx_server = erick.com
/ #
We cm of environment variables to modify
[root@node-1 cm]# kubectl edit configmap nginx-nc
# 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: "8080"
nginx_server: erick.com
kind: ConfigMap
metadata:
creationTimestamp: "2019-06-20T22:34:44Z"
name: nginx-nc
namespace: default
resourceVersion: "436267"
selfLink: /api/v1/namespaces/default/configmaps/nginx-nc
uid: 9a180b6e-93ab-11e9-b0ae-080027edb92f
~
把port修改成8080
再次查看环境变量是否更改
[root@node-1 cm]# kubectl exec -it myapp-cm-1 -- /bin/sh
/ # env|grep nginx_port
nginx_port=80
/ # Conclusion: pod environment variables will only take effect when first created, even if it will not take effect restart pod, post-modification will not take effect.
2. Reference environment variables based on pod storage volume.
apiVersion: v1
kind: Pod
metadata:
name: myappcmwww
namespace: default
annotations:
erick: "by erick"
spec:
containers:
- name: myappcmwww
image: ikubernetes/myapp:v1
ports:- name: http
containerPort: 80
volumeMounts: - name: nginx-conf
mountPath: /etc/nginx/conf.d/
volumes:
- name: http
- name: nginx-conf
configMap:
name: nginx-cm-from-file
[root@node-1 cm]#
See container into the environment variable
[the root-Node. 1 cm & lt @] # kubectl Exec Expediting IT myappcmwww - / bin / SH
/ CAT # /etc/nginx/conf.d/
..2019_06_22_09_11_04.278015527 / ..data / www.conf
/ CAT # /etc/nginx/conf.d/www.conf
Server {
server_name myapp.com;
the listen 80;
the root / Data / Web / HTML;
}
/ #
Modify configmap port 8080
[root@node-1 ~]# kubectl edit cm nginx-cm-from-file
# 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:
www.conf: "server {\n\tserver_name myapp.com;\n\tlisten 8080;\n\troot /data/web/html;\n\n}\n"
kind: ConfigMap
metadata:
creationTimestamp: "2019-06-20T22:43:44Z"
name: nginx-cm-from-file
namespace: default
resourceVersion: "494403"
selfLink: /api/v1/namespaces/default/configmaps/nginx-cm-from-file
uid: dbd2aa33-93ac-11e9-b0ae-080027edb92f
在容器内查看环境变量是否更改。
/ # cat /etc/nginx/conf.d/www.conf
server {
server_name myapp.com;
listen 8080;
root /data/web/html;
}
/ # The dynamic has changed.
Secret
Secret format is encoded using base64
[root@node-1 cm]# kubectl create secret --help
[root@node-1 cm]# kubectl create secret --help
Create a secret using specified subcommand.
Available Commands:
docker-registry Create a secret for use with a Docker registry ## 链接私有镜像时
generic Create a secret from a local file, directory or literal value ## 储存密码时
tls Create a TLS secret ## 放入证书时
Usage:
kubectl create secret [flags] [options]
Use "kubectl <command> --help" for more information about a given command.
Use "kubectl options" for a list of global command-line options (applies to all commands).
[root@node-1 cm]#
secrete bash64 is encrypted, the decryption may be reversed.