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How to define Container environment variables using ConfigMap data
Author: Venkata Sudhakar
The below example shows how to define Container environment variables using ConfigMap data. First create ConfigMap with required key value pairs. Next define the Container environment variables using valueFrom in container specification.
01 | $ kubectl create configmap abc-configmap --from-literal aws.access.key=AAAAAAAAAA --from-literal aws.secret.key=BBBBBBBBBB |
02 | configmap/abc-configmap created |
08 | name: pod-with-env-var2 |
11 | - name: env-with-configmap2 |
12 | image: bethecoder/docker-http-server:latest |
14 | # Define the environment variable |
15 | - name: AWS_ACCESS_KEY |
18 | # The ConfigMap containing the value you want to assign to AWS_ACCESS_KEY |
20 | # Key associated with the value |
22 | - name: AWS_SECRET_KEY |
25 | # The ConfigMap containing the value you want to assign to AWS_SECRET_KEY |
27 | # Key associated with the value |
Now create a POD from the above definition, log into the container and inspect the newly added environment variables from ConfigMap.
01 | $ kubectl apply -f pod-def.yml |
02 | pod/pod-with-env-var created |
05 | NAME READY STATUS RESTARTS AGE |
06 | pod-with-env-var2 1/1 Running 0 77s |
08 | $ kubectl exec -it pod-with-env-var2 -- sh |
10 | KUBERNETES_SERVICE_PORT=443 |
12 | HOSTNAME=pod-with-env-var2 |
15 | AWS_SECRET_KEY=BBBBBBBBBB |
18 | KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1 |
19 | PATH=/go/bin:/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin |
20 | KUBERNETES_PORT_443_TCP_PORT=443 |
21 | KUBERNETES_PORT_443_TCP_PROTO=tcp |
22 | AWS_ACCESS_KEY=AAAAAAAAAA |
24 | KUBERNETES_SERVICE_PORT_HTTPS=443 |
25 | KUBERNETES_PORT_443_TCP=tcp: |
27 | KUBERNETES_SERVICE_HOST=10.96.0.1 |
28 | GOLANG_SRC_SHA256=8796cc48217b59595832aa9de6db45f58706dae68c9c7fbbd78c9fdbe3cd9032 |
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