Step One: Export Resources

The first step of the cluster migration process is exporting resources from a source cluster of any namespace to be input for the subsequent commands.

All of the following export commands will output the contents of the foo namespace into a local export directory with the context demo defined in KUBECONFIG.

crane export -n foo -e export --context demo

cat << EOF >> conf.yaml
namespace: foo
export-dir: export
context: demo
EOF

crane export -c conf.yaml

cat << EOF >> conf.yaml
namespace: foo
export-dir: export
context: testing
EOF

crane export -c conf.yaml --context demo

# Note the difference is we are overriding "context" here with flag

Note: There are multiple ways to input a command, precedence of which is input from flags > input from config file > env variables > default values (not all the flags can have a corresponding env variable). This behavior persists across all Crane CLI commands.

Source