Kubernetes
Description
The kubernetes crawler looks recursively for every .yaml and .yml file from a root directory, and updates the container images declared in any Kubernetes pod specification it recognises.
Multi-document YAML files are supported, and each document is addressed by index in the generated manifest.
This crawler is enabled by default, so it can be used either automatically by running updatecli diff from a directory containing the files to update, or by providing a manifest.
The automatic discovery behavior can be tuned by providing a YAML manifest with a kubernetes crawler in top-level directive autodiscovery as explained in the "Autodiscovery" page.
Supported resources
Images are read from containers and initContainers at any of these locations:
spec.containers/spec.initContainers- barePodspec.template.spec.…-Deployment,DaemonSet,StatefulSet,Job, and anything else built on a pod templatespec.jobTemplate.spec.template.spec.…-CronJob
Matching is structural: apiVersion and kind are not checked, so any document exposing one of those paths is processed.
Generated manifests
Each image produces a dockerimage source for the latest tag and a yaml target that rewrites the image reference in place. When digest pinning is enabled, a dockerdigest source is added and the digest is written alongside the tag.
digest defaults to true. Set digest: false to track the tag only.
Authentication
Use auths to reach private registries, keyed by registry URL without a scheme, accepting either a token or a username/password pair. When it is empty Updatecli falls back to the ambient OCI credentials, such as those written by docker login.
Version filtering
If unspecified, the version filter defaults to kind semver with pattern *.
The pattern is then narrowed per image using the tag currently in the file: an image on 3.18 is filtered with >=3.18, and a tagfilter regex derived from the shape of that tag is added so unrelated tag conventions are not considered.
More details on the "Version Filtering" page.
Limitations
Kustomize
images:transformers in akustomization.yamlare not supported. Plain Kubernetes manifests living inside a kustomize tree are picked up normally, because they carry a standard pod specification.filespatterns are matched against the file name only, not against the path. Use.yaml, notmanifests/.yaml.An image whose value contains a template expression, such as
"{{ .Values.image.repository }}:{{ .Values.image.tag }}", cannot be resolved to a tag. A digest-only manifest is generated for it, which is rarely actionable (useignoreto exclude these).
Manifest
Parameters
| Name | Type | Description | Required |
|---|---|---|---|
| auths | object | “auths” defines the registry credentials, keyed by registry host without scheme. remark:
example: | |
| password | string | “password” defines the container registry password used for authentication. default:
credentials are retrieved from the local environment, such as remark:
| |
| token | string | “token” defines the container registry bearer token used for authentication. default:
credentials are retrieved from the local environment, such as remark:
| |
| username | string | “username” defines the container registry username used for authentication. default:
credentials are retrieved from the local environment, such as remark:
| |
| digest | boolean | “digest” defines whether the generated manifests pin the image digest in addition to the tag. default: true | |
| files | array | “files” defines the file name patterns the crawler searches for. The pattern syntax is: default: remark:
| |
| ignore | array | “ignore” defines rules to exclude matching container images from the autodiscovery. remark:
| |
| images | array | “images” defines the container image names to match. remark:
| |
| path | string | “path” defines a Kubernetes file path pattern. remark:
| |
| only | array | “only” defines rules to restrict the autodiscovery to matching container images. remark:
| |
| images | array | “images” defines the container image names to match. remark:
| |
| path | string | “path” defines a Kubernetes file path pattern. remark:
| |
| rootdir | string | “rootdir” defines the directory where the crawler starts searching for Kubernetes files. default: the scm directory when “scmid” is set, otherwise the directory relative paths resolve from, by default the working directory. remark:
| |
| versionfilter | object | “versionfilter” defines the version filter used by the generated manifests. default:
kind “semver” with pattern “>= remark:
example: | |
| kind | string | “kind” defines the versioning scheme used to select a version. default: latest remark:
example:
| |
| pattern | string | “pattern” defines the version pattern, according to “kind”. default:
remark:
example:
| |
| regex | string | “regex” defines the regular expression extracting the version from each entry. remark:
example:
| |
| replaceall | object | “replaceall” applies a regular expression replacement to each version before filtering. remark:
example: turns “curl-8_15_0” into “curl-8.15.0”. | |
| pattern | string | “pattern” defines the regular expression matching the text to replace. example:
| |
| replacement | string | “replacement” defines the text replacing each match of “pattern”. remark:
example:
| |
| strict | boolean | “strict” enforces strict semantic versioning rules when parsing versions. default: false remark:
|
Example
# updatecli.d/default.yaml
name: "Kubernetes autodiscovery"
scms:
default:
kind: git
spec:
url: "https://github.com/jenkins-infra/release.git"
branch: master
autodiscovery:
scmid: default
crawlers:
kubernetes:
digest: true
versionfilter:
kind: semver
pattern: minoronly
## To ignore specific path
#ignore:
# - images:
# - "mcr.microsoft.com/dotnet/framework/sdk"
only:
- images:
- "mcr.microsoft.com/dotnet/framework/sdk"