Using environment variables in Kubernetes deployment spec

gistfile1.txt

https://serverfault.com/questions/791715/using-environment-variables-in-kubernetes-deployment-spec

A much easier/cleaner solution: envsubst

In deploy.yml:

LoadbalancerIP: $LBIP
Then just create your env var and run kubectl like this:

export LBIP="1.2.3.4"
envsubst < deploy.yml | kubectl apply -f -
You just put regular Bash variables into whatever file you want to use, in this case the YAML manifest, and have ensubst read that file. It will output the file with the env vars replaced by their values. You can also use it to create new files like this:

envsubst < input.yml > output.yml
envsubst is available in e.g. Ubuntu/Debian gettext package.