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