Currently there is no easy way to upgrade kubernetes objects in case of kubernetes upgrade. There are some tools which are available for this purpose, but we found them inadequate for migration requirements.
kubedd
is a tool to check issues in migration of kubernetes yaml objects from one kubernetes version to another.
It uses openapi spec provided by the kubernetes with releases, for eg. in case of target kubernetes version 1.22 openapi spec for 1.22, to validate the kubernetes objects for depreciation or non-conformity with openapi spec.
Supported input formats
- Directory containing files to be validated
- Read kubernetes objects directly from cluster.Uses
kubectl.kubernetes.io/last-applied-configuration
to get last applied configuration and in its absence uses the manifest itself.
It provides details of issues with the kubernetes object in case they are migrated to cluster with newer kubernetes version.
Just with few commands, it's ready to serve your cluster.
git clone https://github.com/devtron-labs/silver-surfer.git
cd silver-surfer
go mod vendor
go mod download
make
It's done. A bin
directory might have created with the binary ready to use ./kubedd
command.
You can also use the Dockerfile present to run command within a container and analyze the cluster running in your host machine. Switch to the project directory containing the dockerfile and run
docker build . -t silver-surfer --build-arg RELEASE=goreleaser --build-arg AUTH_TOKEN=YOUR_GITHUB_TOKEN
docker run -v /host/path-to/.kube-dir/:/opt/.kube --privileged --net=host --name kubedd silver-surfer --kubeconfig /opt/.kube/config
You can download the binaries for Windows, Linux and MacOS from the release page on this repository.
./kubedd --help
Validates migration of Kubernestes YAML file against specific kubernetes version, it provides details of issues with the kubernetes object in case they are migrated to cluster with newer kubernetes version
Usage:
kubedd <file> [file...] [flags]
Flags:
-d, --directories strings A comma-separated list of directories to recursively search for YAML documents
--force-color Force colored output even if stdout is not a TTY
-h, --help help for kubedd
--ignore-keys-for-deprecation strings A comma-separated list of keys to be ignored for depreciation check (default [metadata*,status*])
--ignore-keys-for-validation strings A comma-separated list of keys to be ignored for validation check (default [status*,metadata*])
--ignore-kinds strings A comma-separated list of kinds to be skipped (default [event,CustomResourceDefinition])
--ignore-namespaces strings A comma-separated list of namespaces to be skipped (default [kube-system])
--ignore-null-errors Ignore null value errors (default true)
--ignored-filename-patterns strings An alias for ignored-path-patterns
-i, --ignored-path-patterns strings A comma-separated list of regular expressions specifying paths to ignore
--insecure-skip-tls-verify If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure
--kubeconfig string Path of kubeconfig file of cluster to be scanned
--kubecontext string Kubecontext to be selected
--no-color Display results without color
--select-kinds strings A comma-separated list of kinds to be selected, if left empty all kinds are selected
--select-namespaces strings A comma-separated list of namespaces to be selected, if left empty all namespaces are selected
--source-kubernetes-version string Version of Kubernetes of the cluster on which kubernetes objects are deployed currently, ignored in case cluster is provided. In case of directory defaults to same as target-kubernetes-version.
--source-schema-location string SourceSchemaLocation is the file path of kubernetes versions of the cluster on which manifests are deployed. Use this in air-gapped environment where internet access is unavailable.
--target-kubernetes-version string Version of Kubernetes to migrate to eg 1.22, 1.21, 1.12 (default "1.22")
--target-schema-location string TargetSchemaLocation is the file path of kubernetes version of the target cluster for these manifests. Use this in air-gapped environment where internet access is unavailable.
--version version for kubedd
It categorises kubernetes objects based on change in ApiVersion. Categories are
- Removed ApiVersion
- Deprecated ApiVersion
- Newer ApiVersion
- Unchanged ApiVersion
Within each category it identifies migration path to newer ApiVersion, possible paths are
- It cannot be migrated as there are no common ApiVersions between source and target kubernetes version
- It can be migrated but has some issues which need to be resolved
- It can be migrated with just ApiVersion change
This activity is performed for both current and new ApiVersion.
Check out our contributing guidelines. We deeply appreciate your contributions.
- kubeval - most popular, only validates against the given kubernetes version, doesn't provide migration path
- kube-no-trouble - provides information about removed and deprecated api but doesn't validate schema
- kubepug - provides information based on deprecation comments in the schema, doesn't provide information