c43331d67a
* add preStop hook to trigger Fast Shutdown * disable readiness probe by default When Kubernetes terminates a pod, the container runtime typically sends a SIGTERM signal to pid 1 in each container [0]. PostgreSQL interprets SIGTERM as a request to do a "Smart Shutdown" [1]. This can take minutes (often exhausting the termination grace period), and during this time, new connections are not being serviced. Now that postgresql has a single replica, this behavior is undesirable. If we kill the pod (e.g. in an upgrade), we probably want it to come back as soon as possible. This change adds a preStop hook that sends a SIGINT to postgresql in order to trigger a "Fast Shutdown". In addition, the readiness probe is disabled by default, since it adds no value in a single-replica scenario. 0: https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#pod-termination 1: https://www.postgresql.org/docs/9.6/server-shutdown.html Change-Id: Ib5f3d2a49e55332604c91f9a011e87d78947dbef
277 lines
10 KiB
YAML
277 lines
10 KiB
YAML
{{/*
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/}}
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{{- define "livenessProbeTemplate" -}}
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exec:
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command:
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- /tmp/readiness.sh
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{{- end -}}
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{{- define "readinessProbeTemplate" -}}
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exec:
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command:
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- /tmp/readiness.sh
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{{- end -}}
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{{- if .Values.manifests.statefulset }}
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{{- $envAll := . }}
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{{- $serviceAccountName := "postgresql" }}
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{{ tuple $envAll "postgresql" $serviceAccountName | include "helm-toolkit.snippets.kubernetes_pod_rbac_serviceaccount" }}
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: Role
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metadata:
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name: {{ $serviceAccountName }}
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namespace: {{ $envAll.Release.Namespace }}
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rules:
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- apiGroups:
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- ""
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resources:
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- configmaps
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verbs:
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- create
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- get
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- list
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- patch
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- update
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- watch
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- apiGroups:
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- ""
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resources:
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- endpoints
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verbs:
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- get
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- patch
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- update
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# the following three privileges are necessary only when using endpoints
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- create
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- list
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- watch
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- apiGroups:
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- ""
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resources:
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- pods
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verbs:
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- get
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- list
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- patch
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- update
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- watch
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# The following privilege is only necessary for creation of headless service
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# for postgresql-config endpoint, in order to prevent cleaning it up by the
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# k8s master.
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- apiGroups:
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- ""
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resources:
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- services
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verbs:
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- create
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- get
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- list
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- patch
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- update
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- watch
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- delete
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: RoleBinding
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metadata:
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name: {{ $serviceAccountName }}
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namespace: {{ $envAll.Release.Namespace }}
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: Role
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name: {{ $serviceAccountName }}
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subjects:
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- kind: ServiceAccount
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name: {{ $serviceAccountName }}
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namespace: {{ $envAll.Release.Namespace }}
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---
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apiVersion: apps/v1
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kind: StatefulSet
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metadata:
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name: postgresql
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annotations:
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{{ tuple $envAll | include "helm-toolkit.snippets.release_uuid" }}
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labels:
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{{ tuple $envAll "postgresql" "server" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 4 }}
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cluster-name: {{ tuple "postgresql" "internal" . | include "helm-toolkit.endpoints.hostname_short_endpoint_lookup" }}
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spec:
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serviceName: {{ tuple "postgresql" "internal" . | include "helm-toolkit.endpoints.hostname_short_endpoint_lookup" }}
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podManagementPolicy: "Parallel"
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{{ tuple $envAll | include "helm-toolkit.snippets.kubernetes_upgrades_statefulset" | indent 2 }}
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replicas: {{ .Values.pod.replicas.server }}
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selector:
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matchLabels:
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{{ tuple $envAll "postgresql" "server" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 6 }}
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cluster-name: {{ tuple "postgresql" "internal" . | include "helm-toolkit.endpoints.hostname_short_endpoint_lookup" }}
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template:
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metadata:
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labels:
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{{ tuple $envAll "postgresql" "server" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 8 }}
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cluster-name: {{ tuple "postgresql" "internal" . | include "helm-toolkit.endpoints.hostname_short_endpoint_lookup" }}
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annotations:
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{{ tuple $envAll | include "helm-toolkit.snippets.release_uuid" | indent 8 }}
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configmap-bin-hash: {{ tuple "configmap-bin.yaml" . | include "helm-toolkit.utils.hash" }}
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configmap-etc-hash: {{ tuple "configmap-etc.yaml" . | include "helm-toolkit.utils.hash" }}
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{{ dict "envAll" $envAll "podName" "postgresql" "containerNames" (list "postgresql" "set-volume-perms" "init") | include "helm-toolkit.snippets.kubernetes_mandatory_access_control_annotation" | indent 8 }}
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configmap-admin-hash: {{ tuple "secret-admin.yaml" . | include "helm-toolkit.utils.hash" }}
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configmap-secrets-etc-hash: {{ tuple "secrets-etc.yaml" . | include "helm-toolkit.utils.hash" }}
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spec:
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serviceAccountName: {{ $serviceAccountName }}
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{{ dict "envAll" $envAll "application" "server" | include "helm-toolkit.snippets.kubernetes_pod_security_context" | indent 6 }}
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affinity:
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{{ tuple $envAll "postgresql" "server" | include "helm-toolkit.snippets.kubernetes_pod_anti_affinity" | indent 8 }}
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nodeSelector:
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{{ .Values.labels.server.node_selector_key }}: {{ .Values.labels.server.node_selector_value }}
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terminationGracePeriodSeconds: {{ .Values.pod.lifecycle.termination_grace_period.server.timeout | default "180" }}
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initContainers:
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{{ tuple $envAll "postgresql" list | include "helm-toolkit.snippets.kubernetes_entrypoint_init_container" | indent 8 }}
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- name: set-volume-perms
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{{ tuple $envAll "postgresql" | include "helm-toolkit.snippets.image" | indent 10 }}
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{{ tuple $envAll $envAll.Values.pod.resources.server | include "helm-toolkit.snippets.kubernetes_resources" | indent 10 }}
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command: ["/bin/sh", "-c"]
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args:
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- set -xe;
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/bin/chown {{ .Values.pod.security_context.server.pod.runAsUser }} {{ .Values.storage.mount.path }};
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/bin/chmod 700 {{ .Values.storage.mount.path }};
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/bin/chmod 700 {{ .Values.storage.mount.path }}/*;
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{{ dict "envAll" $envAll "application" "server" "container" "set_volume_perms" | include "helm-toolkit.snippets.kubernetes_container_security_context" | indent 10 }}
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volumeMounts:
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- name: pod-tmp
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mountPath: /tmp
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- name: postgresql-data
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mountPath: {{ .Values.storage.mount.path }}
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subPath: {{ .Values.storage.mount.subpath }}
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containers:
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- name: postgresql
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{{ tuple $envAll "postgresql" | include "helm-toolkit.snippets.image" | indent 10 }}
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{{ tuple $envAll $envAll.Values.pod.resources.server | include "helm-toolkit.snippets.kubernetes_resources" | indent 10 }}
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{{ dict "envAll" $envAll "application" "server" "container" "postgresql" | include "helm-toolkit.snippets.kubernetes_container_security_context" | indent 10 }}
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ports:
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- containerPort: {{ tuple "postgresql-restapi" "internal" "restapi" . | include "helm-toolkit.endpoints.endpoint_port_lookup" }}
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protocol: TCP
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- containerPort: {{ tuple "postgresql" "internal" "postgresql" . | include "helm-toolkit.endpoints.endpoint_port_lookup" }}
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protocol: TCP
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env:
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- name: PGDATA
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value: "{{ .Values.storage.mount.path }}/pgdata"
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- name: KUBERNETES_NAMESPACE
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valueFrom:
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fieldRef:
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fieldPath: metadata.namespace
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- name: POD_NAME
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valueFrom:
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fieldRef:
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fieldPath: metadata.name
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- name: 'POSTGRES_PASSWORD'
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valueFrom:
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secretKeyRef:
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name: {{ .Values.secrets.postgresql.admin }}
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key: 'POSTGRES_PASSWORD'
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- name: 'POSTGRES_USER'
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valueFrom:
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secretKeyRef:
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name: {{ .Values.secrets.postgresql.admin }}
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key: 'POSTGRES_USER'
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command:
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- /tmp/start.sh
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{{ dict "envAll" . "component" "server" "container" "postgresql" "type" "liveness" "probeTemplate" (include "livenessProbeTemplate" . | fromYaml) | include "helm-toolkit.snippets.kubernetes_probe" | trim | indent 10 }}
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{{ dict "envAll" . "component" "server" "container" "postgresql" "type" "readiness" "probeTemplate" (include "readinessProbeTemplate" . | fromYaml) | include "helm-toolkit.snippets.kubernetes_probe" | trim | indent 10 }}
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lifecycle:
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preStop:
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exec:
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command:
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- bash
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- -c
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- kill -INT 1
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volumeMounts:
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- name: pod-tmp
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mountPath: /tmp
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- name: pg-run
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mountPath: /var/run/postgresql
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- name: postgresql-bin
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mountPath: /tmp/start.sh
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subPath: start.sh
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readOnly: true
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- name: postgresql-bin
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mountPath: /tmp/readiness.sh
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subPath: readiness.sh
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readOnly: true
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- name: postgresql-etc
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mountPath: /tmp/pg_hba.conf
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subPath: pg_hba.conf
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readOnly: true
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- name: postgresql-etc
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mountPath: /tmp/postgresql.conf
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subPath: postgresql.conf
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readOnly: true
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- name: postgresql-data
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mountPath: {{ .Values.storage.mount.path }}
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subPath: {{ .Values.storage.mount.subpath }}
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{{- if eq .Values.conf.postgresql.archive_mode "on" }}
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- name: postgresql-archive
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mountPath: {{ .Values.storage.archive.mount_path }}
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subPath: {{ .Values.storage.mount.subpath }}
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{{- end }}
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volumes:
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- name: pod-tmp
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emptyDir: {}
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- name: postgres-home-config
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emptyDir: {}
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- name: pg-run
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emptyDir:
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medium: "Memory"
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- name: postgresql-bin
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secret:
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secretName: postgresql-bin
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defaultMode: 0555
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- name: postgresql-etc
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configMap:
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name: postgresql-etc
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defaultMode: 0444
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{{- if not .Values.storage.pvc.enabled }}
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- name: postgresql-data
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hostPath:
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path: {{ .Values.storage.host.host_path }}
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{{- end }}
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{{- if or (eq .Values.conf.postgresql.archive_mode "on" ) (eq .Values.storage.pvc.enabled true) }}
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volumeClaimTemplates:
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{{- if .Values.storage.pvc.enabled }}
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- metadata:
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name: postgresql-data
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annotations:
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{{ .Values.storage.pvc.class_path }}: {{ .Values.storage.pvc.class_name }}
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spec:
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accessModes: ["ReadWriteOnce"]
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resources:
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requests:
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storage: {{ .Values.storage.pvc.size }}
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{{- end }}
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{{- if eq .Values.conf.postgresql.archive_mode "on" }}
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- metadata:
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name: postgresql-archive
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annotations:
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{{ .Values.storage.archive_pvc.class_path }}: {{ .Values.storage.archive_pvc.class_name }}
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spec:
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accessModes: ["ReadWriteOnce"]
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resources:
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requests:
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storage: {{ .Values.storage.archive_pvc.size }}
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{{- end }}
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{{- end }}
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{{- end }}
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