kubernetes/common/etcd/templates/statefulset.yaml

   1 {{/*
   2 # Copyright © 2019 Intel Corporation Inc
   3 #
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7 #
   8 #       http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15 */}}
  16 apiVersion: apps/v1
  17 kind: StatefulSet
  18 metadata: {{- include "common.resourceMetadata" . | nindent 2 }}
  19 spec:
  20   selector: {{- include "common.selectors" . | nindent 4 }}
  21   serviceName: {{ include "common.servicename" . }}
  22   replicas: {{ .Values.replicaCount }}
  23   template:
  24     metadata: {{- include "common.templateMetadata" . | nindent 6 }}
  25     spec:
  26 {{- if .Values.affinity }}
  27       affinity:
  28 {{ toYaml .Values.affinity | indent 8 }}
  29 {{- end }}
  30 {{- if .Values.nodeSelector }}
  31       nodeSelector:
  32 {{ toYaml .Values.nodeSelector | indent 8 }}
  33 {{- end }}
  34 {{- if .Values.tolerations }}
  35       tolerations:
  36 {{ toYaml .Values.tolerations | indent 8 }}
  37 {{- end }}
  38       {{- include "common.imagePullSecrets" . | nindent 6 }}
  39       containers:
  40       - name: {{ include "common.name" .  }}
  41         image: {{ include "repositoryGenerator.googleK8sRepository" . }}/{{ .Values.image }}
  42         imagePullPolicy: "{{ .Values.pullPolicy }}"
  43         ports:
  44         - containerPort: {{ .Values.service.peerInternalPort }}
  45           name: {{ .Values.service.peerPortName }}
  46         - containerPort: {{ .Values.service.clientInternalPort }}
  47           name: {{ .Values.service.clientPortName }}
  48         {{- if eq .Values.liveness.enabled true }}
  49         livenessProbe:
  50           tcpSocket:
  51             port: {{ .Values.service.clientInternalPort }}
  52           initialDelaySeconds: {{ .Values.liveness.initialDelaySeconds }}
  53           periodSeconds: {{ .Values.liveness.periodSeconds }}
  54           timeoutSeconds: {{ .Values.liveness.timeoutSeconds }}
  55         {{ end -}}
  56         resources: {{ include "common.resources" . | nindent 10 }}
  57         env:
  58         - name: INITIAL_CLUSTER_SIZE
  59           value: {{ .Values.replicaCount | quote }}
  60         - name: SET_NAME
  61           value: {{ include "common.fullname" . }}
  62         - name: SERVICE_NAME
  63           value: {{ include "common.servicename" . }}.{{ include "common.namespace" . }}.svc.{{ .Values.global.clusterName }}
  64 {{- if .Values.extraEnv }}
  65 {{ toYaml .Values.extraEnv | indent 8 }}
  66 {{- end }}
  67         lifecycle:
  68           preStop:
  69             exec:
  70               command:
  71                 - "/bin/sh"
  72                 - "-ec"
  73                 - |
  74                   EPS=""
  75                   for i in $(seq 0 $((${INITIAL_CLUSTER_SIZE} - 1))); do
  76                       EPS="${EPS}${EPS:+,}http://${SET_NAME}-${i}.${SERVICE_NAME}:2379"
  77                   done
  78
  79                   HOSTNAME=$(hostname)
  80
  81                   member_hash() {
  82                       etcdctl member list | grep http://${HOSTNAME}.${SERVICE_NAME}:2380 | cut -d':' -f1 | cut -d'[' -f1
  83                   }
  84
  85                   SET_ID=${HOSTNAME##*[^0-9]}
  86
  87                   if [ "${SET_ID}" -ge ${INITIAL_CLUSTER_SIZE} ]; then
  88                       echo "Removing ${HOSTNAME} from etcd cluster"
  89                       ETCDCTL_ENDPOINT=${EPS} etcdctl member remove $(member_hash)
  90                       if [ $? -eq 0 ]; then
  91                           # Remove everything otherwise the cluster will no longer scale-up
  92                           rm -rf /var/run/etcd/*
  93                       fi
  94                   fi
  95         command:
  96           - "/bin/sh"
  97           - "-ec"
  98           - |
  99             HOSTNAME=$(hostname)
 100
 101             # store member id into PVC for later member replacement
 102             collect_member() {
 103                 while ! etcdctl member list &>/dev/null; do sleep 1; done
 104                 etcdctl member list | grep http://${HOSTNAME}.${SERVICE_NAME}:2380 | cut -d':' -f1 | cut -d'[' -f1 > /var/run/etcd/member_id
 105                 exit 0
 106             }
 107
 108             eps() {
 109                 EPS=""
 110                 for i in $(seq 0 $((${INITIAL_CLUSTER_SIZE} - 1))); do
 111                     EPS="${EPS}${EPS:+,}http://${SET_NAME}-${i}.${SERVICE_NAME}:2379"
 112                 done
 113                 echo ${EPS}
 114             }
 115
 116             member_hash() {
 117                 etcdctl member list | grep http://${HOSTNAME}.${SERVICE_NAME}:2380 | cut -d':' -f1 | cut -d'[' -f1
 118             }
 119
 120             # we should wait for other pods to be up before trying to join
 121             # otherwise we got "no such host" errors when trying to resolve other members
 122             for i in $(seq 0 $((${INITIAL_CLUSTER_SIZE} - 1))); do
 123                 if [ "${SET_NAME}-${i}" == "${HOSTNAME}" ]; then
 124                     echo "Skipping self-checking"
 125                     continue
 126                 fi
 127                 while true; do
 128                     echo "Waiting for ${SET_NAME}-${i}.${SERVICE_NAME} to come up"
 129                     ping -W 1 -c 1 ${SET_NAME}-${i}.${SERVICE_NAME} > /dev/null && break
 130                     sleep 1s
 131                 done
 132             done
 133
 134             # re-joining after failure?
 135             if [[ -e /var/run/etcd/default.etcd && -f /var/run/etcd/member_id ]]; then
 136                 echo "Re-joining etcd member"
 137                 member_id=$(cat /var/run/etcd/member_id)
 138
 139                 # re-join member
 140                 ETCDCTL_ENDPOINT=$(eps) etcdctl member update ${member_id} http://${HOSTNAME}.${SERVICE_NAME}:2380 | true
 141                 exec etcd --name ${HOSTNAME} \
 142                     --listen-peer-urls http://0.0.0.0:2380 \
 143                     --listen-client-urls http://0.0.0.0:2379\
 144                     --advertise-client-urls http://${HOSTNAME}.${SERVICE_NAME}:2379 \
 145                     --data-dir /var/run/etcd/default.etcd
 146             fi
 147
 148             # etcd-SET_ID
 149             SET_ID=${HOSTNAME##*[^0-9]}
 150
 151             # adding a new member to existing cluster (assuming all initial pods are available)
 152             if [ "${SET_ID}" -ge ${INITIAL_CLUSTER_SIZE} ]; then
 153                 export ETCDCTL_ENDPOINT=$(eps)
 154
 155                 # member already added?
 156                 MEMBER_HASH=$(member_hash)
 157                 if [ -n "${MEMBER_HASH}" ]; then
 158                     # the member hash exists but for some reason etcd failed
 159                     # as the datadir has not be created, we can remove the member
 160                     # and retrieve new hash
 161                     etcdctl member remove ${MEMBER_HASH}
 162                 fi
 163
 164                 echo "Adding new member"
 165                 etcdctl member add ${HOSTNAME} http://${HOSTNAME}.${SERVICE_NAME}:2380 | grep "^ETCD_" > /var/run/etcd/new_member_envs
 166
 167                 if [ $? -ne 0 ]; then
 168                     echo "Exiting"
 169                     rm -f /var/run/etcd/new_member_envs
 170                     exit 1
 171                 fi
 172
 173                 cat /var/run/etcd/new_member_envs
 174                 . /var/run/etcd/new_member_envs
 175
 176                 collect_member &
 177
 178                 exec etcd --name ${HOSTNAME} \
 179                     --listen-peer-urls http://0.0.0.0:2380 \
 180                     --listen-client-urls http://0.0.0.0:2379 \
 181                     --advertise-client-urls http://${HOSTNAME}.${SERVICE_NAME}:2379 \
 182                     --data-dir /var/run/etcd/default.etcd \
 183                     --initial-advertise-peer-urls http://${HOSTNAME}.${SERVICE_NAME}:2380 \
 184                     --initial-cluster ${ETCD_INITIAL_CLUSTER} \
 185                     --initial-cluster-state ${ETCD_INITIAL_CLUSTER_STATE}
 186             fi
 187
 188             PEERS=""
 189             for i in $(seq 0 $((${INITIAL_CLUSTER_SIZE} - 1))); do
 190                 PEERS="${PEERS}${PEERS:+,}${SET_NAME}-${i}=http://${SET_NAME}-${i}.${SERVICE_NAME}:2380"
 191             done
 192
 193             collect_member &
 194
 195             # join member
 196             exec etcd --name ${HOSTNAME} \
 197                 --initial-advertise-peer-urls http://${HOSTNAME}.${SERVICE_NAME}:2380 \
 198                 --listen-peer-urls http://0.0.0.0:2380 \
 199                 --listen-client-urls http://0.0.0.0:2379 \
 200                 --advertise-client-urls http://${HOSTNAME}.${SERVICE_NAME}:2379 \
 201                 --initial-cluster-token etcd-cluster-1 \
 202                 --initial-cluster ${PEERS} \
 203                 --initial-cluster-state new \
 204                 --data-dir /var/run/etcd/default.etcd
 205         volumeMounts:
 206         - name: {{ include "common.fullname" . }}-data
 207           mountPath: /var/run/etcd
 208   {{- if .Values.persistence.enabled }}
 209   volumeClaimTemplates:
 210   - metadata:
 211       name: {{ include "common.fullname" . }}-data
 212       labels:
 213         name: {{ include "common.fullname" . }}
 214         chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
 215         release: "{{ include "common.release" . }}"
 216         heritage: "{{ .Release.Service }}"
 217     spec:
 218       accessModes:
 219       - "{{ .Values.persistence.accessMode }}"
 220       storageClassName: {{ include "common.storageClass" . }}
 221       resources:
 222         requests:
 223           # upstream recommended max is 700M
 224           storage: "{{ .Values.persistence.storage }}"
 225   {{- else }}
 226       volumes:
 227       - name: {{ include "common.fullname" . }}-data
 228       {{- if .Values.memoryMode }}
 229         emptyDir:
 230           medium: Memory
 231       {{- else }}
 232         emptyDir: {}
 233       {{- end }}
 234   {{- end }}