[Feature] Add Default Container Mods

Author: ajanikow

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## [master](https://github.com/arangodb/kube-arangodb/tree/master) (N/A)
 - (Maintenance) Extend Documentation
+- (Feature) Add Default Container Mods
 
 ## [1.2.47](https://github.com/arangodb/kube-arangodb/tree/1.2.47) (2025-03-28)
 - (Bugfix) Use Profile Annotations

Makefile

@@ -794,7 +794,7 @@ init: vendor tools update-generated $(BIN)
 .PHONY: tools-min
 tools-min: update-vendor
 	@echo ">> Fetching golangci-lint linter"
-	@GOBIN=$(GOPATH)/bin go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.63.4
+	@GOBIN=$(GOPATH)/bin go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.64.8
 	@echo ">> Fetching goimports"
 	@GOBIN=$(GOPATH)/bin go install golang.org/x/tools/cmd/[email protected]
 	@echo ">> Fetching license check"

docs/api/ArangoProfile.V1Beta1.md

@@ -230,6 +230,190 @@ might be configured in the container image.
 
 ***
 
+### .spec.template.container.default.args
+
+Type: `array` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/core.go#L54)</sup>
+
+Arguments to the entrypoint.
+The container image's CMD is used if this is not provided.
+Variable references $(VAR_NAME) are expanded using the container's environment. If a variable
+cannot be resolved, the reference in the input string will be unchanged. Double $$ are reduced
+to a single $, which allows for escaping the $(VAR_NAME) syntax: i.e. "$$(VAR_NAME)" will
+produce the string literal "$(VAR_NAME)". Escaped references will never be expanded, regardless
+of whether the variable exists or not. Cannot be updated.
+
+Links:
+* [Kubernetes Docs](https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#running-a-command-in-a-shell)
+
+***
+
+### .spec.template.container.default.command
+
+Type: `array` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/core.go#L44)</sup>
+
+Entrypoint array. Not executed within a shell.
+The container image's ENTRYPOINT is used if this is not provided.
+Variable references $(VAR_NAME) are expanded using the container's environment. If a variable
+cannot be resolved, the reference in the input string will be unchanged. Double $$ are reduced
+to a single $, which allows for escaping the $(VAR_NAME) syntax: i.e. "$$(VAR_NAME)" will
+produce the string literal "$(VAR_NAME)". Escaped references will never be expanded, regardless
+of whether the variable exists or not. Cannot be updated.
+
+Links:
+* [Kubernetes Docs](https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#running-a-command-in-a-shell)
+
+***
+
+### .spec.template.container.default.env
+
+Type: `core.EnvVar` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/environments.go#L36)</sup>
+
+Env keeps the information about environment variables provided to the container
+
+Links:
+* [Kubernetes Docs](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.29/#envvar-v1-core)
+
+***
+
+### .spec.template.container.default.envFrom
+
+Type: `core.EnvFromSource` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/environments.go#L41)</sup>
+
+EnvFrom keeps the information about environment variable sources provided to the container
+
+Links:
+* [Kubernetes Docs](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.29/#envfromsource-v1-core)
+
+***
+
+### .spec.template.container.default.image
+
+Type: `string` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/image.go#L35)</sup>
+
+Image define image details
+
+***
+
+### .spec.template.container.default.imagePullPolicy
+
+Type: `string` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/image.go#L39)</sup>
+
+ImagePullPolicy define Image pull policy
+
+Default Value: `IfNotPresent`
+
+***
+
+### .spec.template.container.default.lifecycle
+
+Type: `core.Lifecycle` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/lifecycle.go#L35)</sup>
+
+Lifecycle keeps actions that the management system should take in response to container lifecycle events.
+
+***
+
+### .spec.template.container.default.livenessProbe
+
+Type: `core.Probe` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/probes.go#L37)</sup>
+
+LivenessProbe keeps configuration of periodic probe of container liveness.
+Container will be restarted if the probe fails.
+
+Links:
+* [Kubernetes docs](https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes)
+
+***
+
+### .spec.template.container.default.method
+
+Type: `string` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/policy/merge.go#L32)</sup>
+
+Method defines the merge method
+
+Possible Values: 
+* `"override"` (default) - Overrides values during configuration merge
+* `"append"` - Appends, if possible, values during configuration merge
+
+***
+
+### .spec.template.container.default.ports
+
+Type: `[]core.ContainerPort` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/networking.go#L39)</sup>
+
+Ports contains list of ports to expose from the container. Not specifying a port here
+DOES NOT prevent that port from being exposed. Any port which is
+listening on the default "0.0.0.0" address inside a container will be
+accessible from the network.
+
+***
+
+### .spec.template.container.default.readinessProbe
+
+Type: `core.Probe` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/probes.go#L42)</sup>
+
+ReadinessProbe keeps configuration of periodic probe of container service readiness.
+Container will be removed from service endpoints if the probe fails.
+
+Links:
+* [Kubernetes docs](https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes)
+
+***
+
+### .spec.template.container.default.resources
+
+Type: `core.ResourceRequirements` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/resources.go#L37)</sup>
+
+Resources holds resource requests & limits for container
+
+Links:
+* [Documentation of core.ResourceRequirements](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.29/#resourcerequirements-v1-core)
+
+***
+
+### .spec.template.container.default.securityContext
+
+Type: `core.SecurityContext` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/security.go#L35)</sup>
+
+SecurityContext holds container-level security attributes and common container settings.
+
+Links:
+* [Kubernetes docs](https://kubernetes.io/docs/tasks/configure-pod-container/security-context/)
+
+***
+
+### .spec.template.container.default.startupProbe
+
+Type: `core.Probe` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/probes.go#L50)</sup>
+
+StartupProbe indicates that the Pod has successfully initialized.
+If specified, no other probes are executed until this completes successfully.
+If this probe fails, the Pod will be restarted, just as if the livenessProbe failed.
+This can be used to provide different probe parameters at the beginning of a Pod's lifecycle,
+when it might take a long time to load data or warm a cache, than during steady-state operation.
+
+Links:
+* [Kubernetes docs](https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes)
+
+***
+
+### .spec.template.container.default.volumeMounts
+
+Type: `[]core.VolumeMount` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/volume_mounts.go#L35)</sup>
+
+VolumeMounts keeps list of pod volumes to mount into the container's filesystem.
+
+***
+
+### .spec.template.container.default.workingDir
+
+Type: `string` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/container/resources/core.go#L59)</sup>
+
+Container's working directory.
+If not specified, the container runtime's default will be used, which
+might be configured in the container image.
+
+***
+
 ### .spec.template.pod.affinity
 
 Type: `core.Affinity` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.47/pkg/apis/scheduler/v1beta1/pod/resources/scheduling.go#L44)</sup>

pkg/apis/scheduler/v1beta1/profile_container_template.go

@@ -1,7 +1,7 @@
 //
 // DISCLAIMER
 //
-// Copyright 2024 ArangoDB GmbH, Cologne, Germany
+// Copyright 2024-2025 ArangoDB GmbH, Cologne, Germany
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -25,6 +25,7 @@ import (
 
 	schedulerContainerApi "github.com/arangodb/kube-arangodb/pkg/apis/scheduler/v1beta1/container"
 	shared "github.com/arangodb/kube-arangodb/pkg/apis/shared"
+	"github.com/arangodb/kube-arangodb/pkg/util/errors"
 )
 
 type ProfileContainerTemplate struct {
@@ -33,6 +34,9 @@ type ProfileContainerTemplate struct {
 
 	// All applies generic values to all Containers
 	All *schedulerContainerApi.Generic `json:"all,omitempty"`
+
+	// Default applies generic values to default Container (first one on the list)
+	Default *schedulerContainerApi.Container `json:"default,omitempty"`
 }
 
 func (p *ProfileContainerTemplate) ApplyContainers(template *core.PodTemplateSpec) error {
@@ -51,6 +55,32 @@ func (p *ProfileContainerTemplate) ApplyGeneric(template *core.PodTemplateSpec)
 	return p.All.Apply(template)
 }
 
+func (p *ProfileContainerTemplate) ApplyDefault(template *core.PodTemplateSpec) error {
+	if p == nil {
+		return nil
+	}
+
+	if template == nil {
+		return errors.Errorf("Template is nil")
+	}
+
+	if len(template.Spec.Containers) == 0 {
+		return errors.Errorf("Default container is missing")
+	}
+
+	var cont core.Container
+
+	template.Spec.Containers[0].DeepCopyInto(&cont)
+
+	if err := p.Default.Apply(template, &cont); err != nil {
+		return err
+	}
+
+	template.Spec.Containers[0] = cont
+
+	return nil
+}
+
 func (p *ProfileContainerTemplate) With(other *ProfileContainerTemplate) *ProfileContainerTemplate {
 	if p == nil && other == nil {
 		return nil
@@ -67,6 +97,7 @@ func (p *ProfileContainerTemplate) With(other *ProfileContainerTemplate) *Profil
 	return &ProfileContainerTemplate{
 		Containers: p.Containers.With(other.Containers),
 		All:        p.All.With(other.All),
+		Default:    p.Default.With(other.Default),
 	}
 }
 

pkg/apis/scheduler/v1beta1/profile_templates.go

@@ -1,7 +1,7 @@
 //
 // DISCLAIMER
 //
-// Copyright 2024 ArangoDB GmbH, Cologne, Germany
+// Copyright 2024-2025 ArangoDB GmbH, Cologne, Germany
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -65,6 +65,11 @@ func (p ProfileTemplates) RenderOnTemplate(pod *core.PodTemplateSpec) error {
 		return errors.Wrapf(err, "Error while rendering  ArangoSchedulerPod")
 	}
 
+	// Apply Default Containers Spec
+	if err := t.GetContainer().ApplyDefault(pod); err != nil {
+		return errors.Wrapf(err, "Error while rendering  ArangoSchedulerPod")
+	}
+
 	// Apply Containers Spec
 	if err := t.GetContainer().ApplyContainers(pod); err != nil {
 		return errors.Wrapf(err, "Error while rendering  ArangoSchedulerPod")