0f262ceda3
Kyverno ClusterPolicy reads dependency.kyverno.io/wait-for annotation and injects busybox init containers that block until each dependency is reachable (nc -z). Annotations added to 18 stacks (24 deployments). Includes graceful-db-maintenance.sh script for planned DB maintenance (scales dependents to 0, saves replica counts, restores on startup).
72 lines
2.6 KiB
HCL
72 lines
2.6 KiB
HCL
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# =============================================================================
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# Pod Dependency Init Container Injection
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# =============================================================================
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# Reads the annotation dependency.kyverno.io/wait-for from pods and injects
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# init containers that wait for each listed dependency to be reachable.
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#
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# Usage:
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# annotations:
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# dependency.kyverno.io/wait-for: "postgresql.dbaas:5432,redis.redis:6379"
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#
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# Each comma-separated entry becomes a busybox init container that runs
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# `nc -z <host> <port>` in a loop until the dependency is reachable.
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# Existing init containers are preserved — Kyverno appends to the array.
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resource "kubernetes_manifest" "inject_dependency_init_containers" {
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manifest = {
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apiVersion = "kyverno.io/v1"
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kind = "ClusterPolicy"
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metadata = {
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name = "inject-dependency-init-containers"
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annotations = {
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"policies.kyverno.io/title" = "Inject Dependency Init Containers"
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"policies.kyverno.io/description" = "Injects wait-for init containers based on dependency.kyverno.io/wait-for pod annotation. Each comma-separated host:port entry becomes a busybox init container that blocks until the dependency is reachable via nc -z."
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}
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}
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spec = {
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rules = [
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{
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name = "wait-for-dependencies"
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match = {
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any = [
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{
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resources = {
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kinds = ["Pod"]
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operations = ["CREATE"]
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}
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}
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]
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}
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preconditions = {
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all = [
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{
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key = "{{ request.object.metadata.annotations.\"dependency.kyverno.io/wait-for\" || '' }}"
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operator = "NotEquals"
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value = ""
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}
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]
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}
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mutate = {
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foreach = [
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{
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list = "request.object.metadata.annotations.\"dependency.kyverno.io/wait-for\" | split(@, ',')"
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patchStrategicMerge = {
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spec = {
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initContainers = [
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{
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name = "wait-for-{{ element | split(@, ':') | [0] | replace_all(@, '.', '-') }}"
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image = "busybox:1.37"
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command = ["sh", "-c", "until nc -z {{ element | split(@, ':') | [0] }} {{ element | split(@, ':') | [1] }}; do echo waiting for {{ element }}; sleep 2; done"]
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}
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]
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}
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}
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}
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]
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}
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}
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]
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}
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}
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}
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