v0.10.0-rc1

This is a pre-release for upcoming v0.10.0 release, targeting early adopters for testing, before official release is done. Changelog below:

[0.10.0] - 2023-07-24

Added

• Agent now supports -force-drain flag, which allows removal of pods with custom or no controller when draining nodes #197.

Changed

• Everything is now built using Go 1.20.
• Container images now use Alpine Linux version v3.18 as a base image.

v0.9.0

Added

• Example manifests use new node-role.kubernetes.io/control-plane tolerations in addition to legacy node-role.kubernetes.io/master.
• Added release pipeline which will be building release container images from now on.
• Added compatibility with Kubernetes versions v1.24+.
• kustomization.yaml file has been added to example manifests to enable using them with kustomize.

Changed

• Moved from github.com/flatcar-linux/flatcar-linux-update-operator to github.com/flatcar/flatcar-linux-update-operator. This also means that the docker images will be now available at ghcr.io/flatcar/flatcar-linux-update-operator. The 0.8.0 image is still available at the old location, but no new images will be pushed there.
• Everything is now built using Go 1.19.
• Updated all Go dependencies.
• Dropped dependency on github.com/flatcar-linux/locksmith.
• In example manifests use Role resource instead of ClusterRole where possible to limit scope of permissions.
• Limited operator access to config maps only to one used for leader election in example manifests.
• Improved agent responsiveness to context cancellation.
• Agent code is now covered with tests and some initial refactorings has been performed.
• Container images now use Alpine Linux version v3.15 as a base image.
• Draining pods is now done using Eviction API when possible.
• Capitalization of log messages and formatting of produced errors is now more consistent.
• latest tag for container images will no longer be used. Users are recommended to use specific versions.

Fixed

• Publishing leader election events by operator.
• Agent main loop leaking goroutine when agent is stopped.
• Used service account by agent in example manifests.

Removed

• Unused RBAC permissions from agent and operator example manifest.
• Unreachable agent code.
• Deprecated --auto-label-flatcar-linux flag has been removed from operator.
• Pod Security Policies has been removed from example manifests, as their support has been removed in Kubernetes 1.25.

v0.8.0

Added

• Added golangci-lint and codespell CI jobs using GitHub Actions.
• Added CI for vendor directory, generated files, Go modules tidiness, Dockerfile etc.
• Added missing documentation for all packages.
• Added integration tests for pkg/updateengine.
• Added unit tests for pkg/operator.

Changed

• Updated used Go version to 1.16 and Alpine version for container images to 3.14.
• Container images will be now published to ghcr.io/flatcar-linux/flatcar-linux-update-operator instead of
  quay.io/kinvolk/flatcar-linux-update-operator.
• update-agent now use a dedicated Service Account with lower privileges than the operator.
• update-agent now use a dedicated Pod Security Policy.
• update-operator now use more strict Pod Security Policy, as it no longer needs permissions
  for agent related resources.
• Flatcar Linux references has been changed to Flatcar Container Linux.
• Migrated from glog to klog,
  which is a recommended logger for Kubernetes operators.
• pkg/drain has been integrated into pkg/k8sutil.
• Errors returned from operator and agent runs are now properly wrapped and can be unwrapped by the user.
• Remaining CoreOS references has been replaced with Flatcar.
• pkg/k8sutil.GetVersionInfo() will now return an error when /etc/flatcar/update.conf file is present,
  but not readable.
• Marking node as Unschedulable should now be more robust on frequent Node object updates.
• Renamed Go module from github.com/kinvolk/flatcar-linux-update-operator to github.com/flatcar-linux/flatcar-linux-update-operator, following the move of repository into new organization.

Fixed

• Fixed various typos found by codespell.
• Operator will no longer leak leader election goroutine, it will be now shut down when stop channel gets closed.
• Operator will now internally gracefully return an error when leader election is lost, so process can be restarted
  to start a new leader election.

Removed

• Removed no longer used Travis CI, Jenkins configuration files and build scripts.
• Removed AttemptUpdate(), GetStatus() and RebootNeededSignal() functions from pkg/updateengine package.
• Removed deprecated --manage-agent, --agent-image-repo and --analytics flags from update-operator.
• Deprecated operator functionality to manage agent DaemonSet has been removed. Agent DaemonSet must be now deployed separately.

v0.8.0-rc1

This is a pre-release for upcoming v0.8.0 release, targeting early adopters for testing, as this release includes a large refactor of operator implementation. Changelog below:

Added

• Added golangci-lint and codespell CI jobs using GitHub Actions.
• Added CI for vendor directory, generated files, Go modules tidiness, Dockerfile etc.
• Added missing documentation for all packages.
• Added integration tests for pkg/updateengine.
• Added unit tests for pkg/operator.

Changed

• Updated used Go version to 1.16 and Alpine version for container images to 3.14.
• Container images will be now published to ghcr.io/flatcar-linux/flatcar-linux-update-operator instead of
  quay.io/kinvolk/flatcar-linux-update-operator.
• update-agent now use a dedicated Service Account with lower privileges than the operator.
• update-agent now use a dedicated Pod Security Policy.
• update-operator now use more strict Pod Security Policy, as it no longer needs permissions
  for agent related resources.
• Flatcar Linux references has been changed to Flatcar Container Linux.
• Migrated from glog to klog,
  which is a recommended logger for Kubernetes operators.
• pkg/drain has been integrated into pkg/k8sutil.
• Errors returned from operator and agent runs are now properly wrapped and can be unwrapped by the user.
• Remaining CoreOS references has been replaced with Flatcar.
• pkg/k8sutil.GetVersionInfo() will now return an error when /etc/flatcar/update.conf file is present,
  but not readable.
• Marking node as Unschedulable should now be more robust on frequent Node object updates.
• Renamed Go module from github.com/kinvolk/flatcar-linux-update-operator to github.com/flatcar-linux/flatcar-linux-update-operator, following the move of repository into new organization.

Fixed

• Fixed various typos found by codespell.
• Operator will no longer leak leader election goroutine, it will be now shut down when stop channel gets closed.
• Operator will now internally gracefully return an error when leader election is lost, so process can be restarted
  to start a new leader election.

Removed

• Removed no longer used Travis CI, Jenkins configuration files and build scripts.
• Removed AttemptUpdate(), GetStatus() and RebootNeededSignal() functions from pkg/updateengine package.
• Removed deprecated --manage-agent, --agent-image-repo and --analytics flags from update-operator.
• Deprecated operator functionality to manage agent DaemonSet has been removed. Agent DaemonSet must be now deployed separately.

v0.7.3

Changelog:

• migrate to Go modules
• update all dependencies to latest versions
• fix example manifests for 1.17 compatibility
• make operator compatible with Kubernetes 1.17
• fix publishing leader acquired event by the operator
• use vendored modules when building binaries
• make sure update-agent process runs as root when deploying on Kubernetes