Kubernetes

Kubernetes Config Maps

Posted on 2020-10-12，3 min read

1.创建config map

vi cfgmap-demo.yaml

apiVersion: v1
data:
  database: db.example.com
  db_port: "3306"
  http_url: http://www.example.com
kind: ConfigMap
metadata:
  name: cfgmap-demo

kubectl create -f cfgmap-demo.yaml

2.查看config map

kubectl get configmap cfgmap-demo -o yaml

apiVersion: v1
data:
  database: db.example.com
  db_port: "3306"
  http_url: http://www.example.com
kind: ConfigMap
metadata:
  creationTimestamp: 2018-02-24T07:11:01Z
  name: cfgmap-demo
  namespace: default
  resourceVersion: "1064654"
  selfLink: /api/v1/namespaces/default/configmaps/cfgmap-demo
  uid: de9248d1-1931-11e8-9e24-00163e0e24bf
  1. 修改config map

vi cfgmap-demo.yaml

添加一行键值对

apiVersion: v1
data:
  database: db.example.com
  db_port: "3306"
  http_url: http://www.example.com
  http_port: "80"
kind: ConfigMap
metadata:
  name: cfgmap-demo

更新config map

kubectl replace -f cfgmap-demo.yaml

查看更新后的config map

kubectl get configmap cfgmap-demo -o yaml

apiVersion: v1
data:
  database: db.example.com
  db_port: "3306"
  http_port: "80"
  http_url: http://www.example.com
kind: ConfigMap
metadata:
  creationTimestamp: 2018-02-24T07:11:01Z
  name: cfgmap-demo
  namespace: default
  resourceVersion: "1065520"
  selfLink: /api/v1/namespaces/default/configmaps/cfgmap-demo
  uid: de9248d1-1931-11e8-9e24-00163e0e24bf

4.创建一个Pod并引用这个config map

vi cfgmap-env-pod.yaml

apiVersion: v1
kind: Pod
metadata:
  name: cfgmap-httpd-pod
spec:
  containers:
  - image: httpd
    name: httpd
    imagePullPolicy: Always
    envFrom:
    - configMapRef:
        name: cfgmap-demo

kubectl create -f cfgmap-env-pod.yaml

5.查看config map的键值对是否引入Pod

kubectl exec -ti cfgmap-httpd-pod env

PATH=/usr/local/apache2/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=cfgmap-httpd-pod
TERM=xterm
db_port=3306
http_port=80
http_url=http://www.example.com
database=db.example.com
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
KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
KUBERNETES_SERVICE_HOST=10.96.0.1
KUBERNETES_SERVICE_PORT=443
HTTPD_PREFIX=/usr/local/apache2
NGHTTP2_VERSION=1.18.1-1
OPENSSL_VERSION=1.0.2l-1~bpo8+1
HTTPD_VERSION=2.4.29
HTTPD_SHA256=777753a5a25568a2a27428b2214980564bc1c38c1abf9ccc7630b639991f7f00
HTTPD_PATCHES=
APACHE_DIST_URLS=https://www.apache.org/dyn/closer.cgi?action=download&filename=
HOME=/root

可以看到我们Config map下的所有键值对已经成功引入Pod环境变量.

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