6c2edba8b1
### Changes - using "exec" to run a command replaces the shell process with the executed process - this is required so that the process running in the container is able to receive OS signals - explained in https://docs.docker.com/develop/develop-images/dockerfile_best-practices/ and https://docs.docker.com/engine/reference/builder/#entrypoint - receiving SIGTERM signal is required for graceful shutdown. This is explained in https://pracucci.com/graceful-shutdown-of-kubernetes-pods.html This change might fix issues such as https://github.com/apache/pulsar/issues/6603 . One expectation of this fix is that graceful shutdown would allow Pulsar components such as a bookies to deregistered from Zookeeper properly before shutdown. ### Motivation Dockerfile best practices mention that "exec" should be used so that the process running in a container can receive OS signals. This is explained in https://docs.docker.com/develop/develop-images/dockerfile_best-practices/ and https://docs.docker.com/engine/reference/builder/#entrypoint . Kubernetes documention explains pod termination in https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#pod-termination : "Typically, the container runtime sends a TERM signal to the main process in each container. Once the grace period has expired, the KILL signal is sent to any remaining processes, and the Pod is then deleted from the API Server ." Currently some issues while running Pulsar are caused by the lack of graceful shutdown. Graceful shutdown isn't happening at all since the Pulsar processes never receive the TERM signal that would allow graceful shutdown. This PR fixes that. This PR was inspired by https://github.com/kafkaesque-io/pulsar-helm-chart/pull/31
219 lines
9.0 KiB
YAML
219 lines
9.0 KiB
YAML
#
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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#
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# deploy zookeeper only when `components.zookeeper` is true
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{{- if .Values.components.zookeeper }}
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apiVersion: apps/v1
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kind: StatefulSet
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metadata:
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name: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}"
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namespace: {{ .Values.namespace }}
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labels:
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{{- include "pulsar.standardLabels" . | nindent 4 }}
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component: {{ .Values.zookeeper.component }}
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spec:
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serviceName: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}"
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replicas: {{ .Values.zookeeper.replicaCount }}
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selector:
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matchLabels:
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{{- include "pulsar.matchLabels" . | nindent 6 }}
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component: {{ .Values.zookeeper.component }}
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updateStrategy:
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{{ toYaml .Values.zookeeper.updateStrategy | indent 4 }}
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podManagementPolicy: {{ .Values.zookeeper.podManagementPolicy }}
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template:
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metadata:
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labels:
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{{- include "pulsar.template.labels" . | nindent 8 }}
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component: {{ .Values.zookeeper.component }}
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annotations:
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{{ toYaml .Values.zookeeper.annotations | indent 8 }}
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spec:
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{{- if .Values.zookeeper.nodeSelector }}
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nodeSelector:
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{{ toYaml .Values.zookeeper.nodeSelector | indent 8 }}
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{{- end }}
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{{- if .Values.zookeeper.tolerations }}
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tolerations:
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{{ toYaml .Values.zookeeper.tolerations | indent 8 }}
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{{- end }}
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affinity:
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{{- if and .Values.affinity.anti_affinity .Values.zookeeper.affinity.anti_affinity}}
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podAntiAffinity:
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{{ if eq .Values.zookeeper.affinity.type "requiredDuringSchedulingIgnoredDuringExecution"}}
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{{ .Values.zookeeper.affinity.type }}:
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- labelSelector:
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matchExpressions:
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- key: "app"
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operator: In
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values:
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- "{{ template "pulsar.name" . }}"
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- key: "release"
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operator: In
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values:
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- {{ .Release.Name }}
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- key: "component"
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operator: In
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values:
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- {{ .Values.zookeeper.component }}
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topologyKey: "kubernetes.io/hostname"
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{{ else }}
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{{ .Values.zookeeper.affinity.type }}:
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- weight: 100
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podAffinityTerm:
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labelSelector:
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matchExpressions:
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- key: "app"
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operator: In
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values:
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- "{{ template "pulsar.name" . }}"
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- key: "release"
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operator: In
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values:
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- {{ .Release.Name }}
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- key: "component"
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operator: In
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values:
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- {{ .Values.zookeeper.component }}
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topologyKey: "kubernetes.io/hostname"
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{{ end }}
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{{- end }}
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terminationGracePeriodSeconds: {{ .Values.zookeeper.gracePeriod }}
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containers:
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- name: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}"
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image: "{{ .Values.images.zookeeper.repository }}:{{ .Values.images.zookeeper.tag }}"
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imagePullPolicy: {{ .Values.images.zookeeper.pullPolicy }}
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{{- if .Values.zookeeper.resources }}
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resources:
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{{ toYaml .Values.zookeeper.resources | indent 10 }}
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{{- end }}
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command: ["sh", "-c"]
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args:
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- >
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bin/apply-config-from-env.py conf/zookeeper.conf;
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{{- include "pulsar.zookeeper.tls.settings" . | nindent 10 }}
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bin/generate-zookeeper-config.sh conf/zookeeper.conf;
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exec bin/pulsar zookeeper;
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ports:
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# prometheus needs to access /metrics endpoint
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- name: http
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containerPort: {{ .Values.zookeeper.ports.http }}
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- name: client
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containerPort: {{ .Values.zookeeper.ports.client }}
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- name: follower
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containerPort: {{ .Values.zookeeper.ports.follower }}
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- name: leader-election
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containerPort: {{ .Values.zookeeper.ports.leaderElection }}
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{{- if and .Values.tls.enabled .Values.tls.zookeeper.enabled }}
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- name: client-tls
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containerPort: {{ .Values.zookeeper.ports.clientTls }}
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{{- end }}
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env:
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- name: ZOOKEEPER_SERVERS
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value:
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{{- $global := . }}
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{{ range $i, $e := until (.Values.zookeeper.replicaCount | int) }}{{ if ne $i 0 }},{{ end }}{{ template "pulsar.fullname" $global }}-{{ $global.Values.zookeeper.component }}-{{ printf "%d" $i }}{{ end }}
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envFrom:
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- configMapRef:
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name: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}"
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{{- if .Values.zookeeper.probe.readiness.enabled }}
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readinessProbe:
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exec:
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command:
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- bin/pulsar-zookeeper-ruok.sh
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initialDelaySeconds: {{ .Values.zookeeper.probe.readiness.initialDelaySeconds }}
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periodSeconds: {{ .Values.zookeeper.probe.readiness.periodSeconds }}
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failureThreshold: {{ .Values.zookeeper.probe.readiness.failureThreshold }}
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{{- end }}
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{{- if .Values.zookeeper.probe.liveness.enabled }}
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livenessProbe:
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exec:
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command:
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- bin/pulsar-zookeeper-ruok.sh
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initialDelaySeconds: {{ .Values.zookeeper.probe.liveness.initialDelaySeconds }}
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periodSeconds: {{ .Values.zookeeper.probe.liveness.periodSeconds }}
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failureThreshold: {{ .Values.zookeeper.probe.liveness.failureThreshold }}
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{{- end }}
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{{- if .Values.zookeeper.probe.startup.enabled }}
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startupProbe:
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exec:
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command:
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- bin/pulsar-zookeeper-ruok.sh
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initialDelaySeconds: {{ .Values.zookeeper.probe.startup.initialDelaySeconds }}
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periodSeconds: {{ .Values.zookeeper.probe.startup.periodSeconds }}
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failureThreshold: {{ .Values.zookeeper.probe.startup.failureThreshold }}
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{{- end }}
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volumeMounts:
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- name: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}-{{ .Values.zookeeper.volumes.data.name }}"
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mountPath: /pulsar/data
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{{- if and .Values.tls.enabled .Values.tls.zookeeper.enabled }}
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- mountPath: "/pulsar/certs/zookeeper"
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name: zookeeper-certs
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readOnly: true
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- mountPath: "/pulsar/certs/ca"
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name: ca
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readOnly: true
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- name: keytool
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mountPath: "/pulsar/keytool/keytool.sh"
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subPath: keytool.sh
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{{- end }}
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volumes:
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{{- if not (and (and .Values.volumes.persistence .Values.volumes.persistence) .Values.zookeeper.volumes.persistence) }}
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- name: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}-{{ .Values.zookeeper.volumes.data.name }}"
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emptyDir: {}
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{{- end }}
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{{- if and .Values.tls.enabled .Values.tls.zookeeper.enabled }}
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- name: zookeeper-certs
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secret:
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secretName: "{{ .Release.Name }}-{{ .Values.tls.zookeeper.cert_name }}"
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items:
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- key: tls.crt
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path: tls.crt
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- key: tls.key
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path: tls.key
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- name: ca
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secret:
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secretName: "{{ .Release.Name }}-ca-tls"
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items:
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- key: ca.crt
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path: ca.crt
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- name: keytool
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configMap:
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name: "{{ template "pulsar.fullname" . }}-keytool-configmap"
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defaultMode: 0755
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{{- end}}
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{{- if and (and .Values.persistence .Values.volumes.persistence) .Values.zookeeper.volumes.persistence }}
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volumeClaimTemplates:
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- metadata:
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name: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}-{{ .Values.zookeeper.volumes.data.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.zookeeper.volumes.data.size }}
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{{- if .Values.zookeeper.volumes.data.storageClassName }}
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storageClassName: "{{ .Values.zookeeper.volumes.data.storageClassName }}"
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{{- else if and (not (and .Values.volumes.local_storage .Values.zookeeper.volumes.data.local_storage)) .Values.zookeeper.volumes.data.storageClass }}
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storageClassName: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}-{{ .Values.zookeeper.volumes.data.name }}"
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{{- else if and .Values.volumes.local_storage .Values.zookeeper.volumes.data.local_storage }}
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storageClassName: "local-storage"
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{{- end }}
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{{- end }}
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{{- end }}
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