kubernetes/common/etcd/templates/statefulset.yaml

   1 # Copyright © 2019 Intel Corporation Inc
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #       http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14 apiVersion: apps/v1beta1
  15 kind: StatefulSet
  16 metadata:
  17   name: {{ include "common.fullname" .  }}
  18   labels:
  19     heritage: "{{ .Release.Service }}"
  20     release: "{{ include "common.release" . }}"
  21     chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
  22     app: {{ include "common.name" . }}
  23 spec:
  24   serviceName: {{ include "common.servicename" .}}
  25   replicas: {{ .Values.replicaCount }}
  26   template:
  27     metadata:
  28       labels:
  29         heritage: "{{ .Release.Service }}"
  30         release: "{{ include "common.release" . }}"
  31         chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
  32         app: {{ include "common.name" . }}
  33     spec:
  34 {{- if .Values.affinity }}
  35       affinity:
  36 {{ toYaml .Values.affinity | indent 8 }}
  37 {{- end }}
  38 {{- if .Values.nodeSelector }}
  39       nodeSelector:
  40 {{ toYaml .Values.nodeSelector | indent 8 }}
  41 {{- end }}
  42 {{- if .Values.tolerations }}
  43       tolerations:
  44 {{ toYaml .Values.tolerations | indent 8 }}
  45 {{- end }}
  46       containers:
  47       - name: {{ include "common.fullname" .  }}
  48         image: "{{ .Values.repository }}/{{ .Values.image }}"
  49         imagePullPolicy: "{{ .Values.pullPolicy }}"
  50         ports:
  51         - containerPort: {{ .Values.service.peerInternalPort }}
  52           name: {{ .Values.service.peerPortName }}
  53         - containerPort: {{ .Values.service.clientInternalPort }}
  54           name: {{ .Values.service.clientPortName }}
  55         {{- if eq .Values.liveness.enabled true }}
  56         livenessProbe:
  57           tcpSocket:
  58             port: {{ .Values.service.clientInternalPort }}
  59           initialDelaySeconds: {{ .Values.liveness.initialDelaySeconds }}
  60           periodSeconds: {{ .Values.liveness.periodSeconds }}
  61           timeoutSeconds: {{ .Values.liveness.timeoutSeconds }}
  62         {{ end -}}
  63         resources:
  64 {{ include "common.resources" . | indent 10 }}
  65         env:
  66         - name: INITIAL_CLUSTER_SIZE
  67           value: {{ .Values.replicaCount | quote }}
  68         - name: SET_NAME
  69           value: {{ include "common.fullname" . }}
  70         - name: SERVICE_NAME
  71           value: {{ include "common.servicename" . }}
  72 {{- if .Values.extraEnv }}
  73 {{ toYaml .Values.extraEnv | indent 8 }}
  74 {{- end }}
  75         lifecycle:
  76           preStop:
  77             exec:
  78               command:
  79                 - "/bin/sh"
  80                 - "-ec"
  81                 - |
  82                   EPS=""
  83                   for i in $(seq 0 $((${INITIAL_CLUSTER_SIZE} - 1))); do
  84                       EPS="${EPS}${EPS:+,}http://${SET_NAME}-${i}.${SERVICE_NAME}:2379"
  85                   done
  86
  87                   HOSTNAME=$(hostname)
  88
  89                   member_hash() {
  90                       etcdctl member list | grep http://${HOSTNAME}.${SERVICE_NAME}:2380 | cut -d':' -f1 | cut -d'[' -f1
  91                   }
  92
  93                   SET_ID=${HOSTNAME##*[^0-9]}
  94
  95                   if [ "${SET_ID}" -ge ${INITIAL_CLUSTER_SIZE} ]; then
  96                       echo "Removing ${HOSTNAME} from etcd cluster"
  97                       ETCDCTL_ENDPOINT=${EPS} etcdctl member remove $(member_hash)
  98                       if [ $? -eq 0 ]; then
  99                           # Remove everything otherwise the cluster will no longer scale-up
 100                           rm -rf /var/run/etcd/*
 101                       fi
 102                   fi
 103         command:
 104           - "/bin/sh"
 105           - "-ec"
 106           - |
 107             HOSTNAME=$(hostname)
 108
 109             # store member id into PVC for later member replacement
 110             collect_member() {
 111                 while ! etcdctl member list &>/dev/null; do sleep 1; done
 112                 etcdctl member list | grep http://${HOSTNAME}.${SERVICE_NAME}:2380 | cut -d':' -f1 | cut -d'[' -f1 > /var/run/etcd/member_id
 113                 exit 0
 114             }
 115
 116             eps() {
 117                 EPS=""
 118                 for i in $(seq 0 $((${INITIAL_CLUSTER_SIZE} - 1))); do
 119                     EPS="${EPS}${EPS:+,}http://${SET_NAME}-${i}.${SERVICE_NAME}:2379"
 120                 done
 121                 echo ${EPS}
 122             }
 123
 124             member_hash() {
 125                 etcdctl member list | grep http://${HOSTNAME}.${SERVICE_NAME}:2380 | cut -d':' -f1 | cut -d'[' -f1
 126             }
 127
 128             # we should wait for other pods to be up before trying to join
 129             # otherwise we got "no such host" errors when trying to resolve other members
 130             for i in $(seq 0 $((${INITIAL_CLUSTER_SIZE} - 1))); do
 131                 if [ "${SET_NAME}-${i}" == "${HOSTNAME}" ]; then
 132                     echo "Skipping self-checking"
 133                     continue
 134                 fi
 135                 while true; do
 136                     echo "Waiting for ${SET_NAME}-${i}.${SERVICE_NAME} to come up"
 137                     ping -W 1 -c 1 ${SET_NAME}-${i}.${SERVICE_NAME} > /dev/null && break
 138                     sleep 1s
 139                 done
 140             done
 141
 142             # re-joining after failure?
 143             if [[ -e /var/run/etcd/default.etcd && -f /var/run/etcd/member_id ]]; then
 144                 echo "Re-joining etcd member"
 145                 member_id=$(cat /var/run/etcd/member_id)
 146
 147                 # re-join member
 148                 ETCDCTL_ENDPOINT=$(eps) etcdctl member update ${member_id} http://${HOSTNAME}.${SERVICE_NAME}:2380 | true
 149                 exec etcd --name ${HOSTNAME} \
 150                     --listen-peer-urls http://0.0.0.0:2380 \
 151                     --listen-client-urls http://0.0.0.0:2379\
 152                     --advertise-client-urls http://${HOSTNAME}.${SERVICE_NAME}:2379 \
 153                     --data-dir /var/run/etcd/default.etcd
 154             fi
 155
 156             # etcd-SET_ID
 157             SET_ID=${HOSTNAME##*[^0-9]}
 158
 159             # adding a new member to existing cluster (assuming all initial pods are available)
 160             if [ "${SET_ID}" -ge ${INITIAL_CLUSTER_SIZE} ]; then
 161                 export ETCDCTL_ENDPOINT=$(eps)
 162
 163                 # member already added?
 164                 MEMBER_HASH=$(member_hash)
 165                 if [ -n "${MEMBER_HASH}" ]; then
 166                     # the member hash exists but for some reason etcd failed
 167                     # as the datadir has not be created, we can remove the member
 168                     # and retrieve new hash
 169                     etcdctl member remove ${MEMBER_HASH}
 170                 fi
 171
 172                 echo "Adding new member"
 173                 etcdctl member add ${HOSTNAME} http://${HOSTNAME}.${SERVICE_NAME}:2380 | grep "^ETCD_" > /var/run/etcd/new_member_envs
 174
 175                 if [ $? -ne 0 ]; then
 176                     echo "Exiting"
 177                     rm -f /var/run/etcd/new_member_envs
 178                     exit 1
 179                 fi
 180
 181                 cat /var/run/etcd/new_member_envs
 182                 source /var/run/etcd/new_member_envs
 183
 184                 collect_member &
 185
 186                 exec etcd --name ${HOSTNAME} \
 187                     --listen-peer-urls http://0.0.0.0:2380 \
 188                     --listen-client-urls http://0.0.0.0:2379 \
 189                     --advertise-client-urls http://${HOSTNAME}.${SERVICE_NAME}:2379 \
 190                     --data-dir /var/run/etcd/default.etcd \
 191                     --initial-advertise-peer-urls http://${HOSTNAME}.${SERVICE_NAME}:2380 \
 192                     --initial-cluster ${ETCD_INITIAL_CLUSTER} \
 193                     --initial-cluster-state ${ETCD_INITIAL_CLUSTER_STATE}
 194             fi
 195
 196             PEERS=""
 197             for i in $(seq 0 $((${INITIAL_CLUSTER_SIZE} - 1))); do
 198                 PEERS="${PEERS}${PEERS:+,}${SET_NAME}-${i}=http://${SET_NAME}-${i}.${SERVICE_NAME}:2380"
 199             done
 200
 201             collect_member &
 202
 203             # join member
 204             exec etcd --name ${HOSTNAME} \
 205                 --initial-advertise-peer-urls http://${HOSTNAME}.${SERVICE_NAME}:2380 \
 206                 --listen-peer-urls http://0.0.0.0:2380 \
 207                 --listen-client-urls http://0.0.0.0:2379 \
 208                 --advertise-client-urls http://${HOSTNAME}.${SERVICE_NAME}:2379 \
 209                 --initial-cluster-token etcd-cluster-1 \
 210                 --initial-cluster ${PEERS} \
 211                 --initial-cluster-state new \
 212                 --data-dir /var/run/etcd/default.etcd
 213         volumeMounts:
 214         - name: {{ include "common.fullname" . }}-data
 215           mountPath: /var/run/etcd
 216   {{- if .Values.persistence.enabled }}
 217   volumeClaimTemplates:
 218   - metadata:
 219       name: {{ include "common.fullname" . }}-data
 220       labels:
 221         name: {{ include "common.fullname" . }}
 222         chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
 223         release: "{{ include "common.release" . }}"
 224         heritage: "{{ .Release.Service }}"
 225     spec:
 226       accessModes:
 227       - "{{ .Values.persistence.accessMode }}"
 228       storageClassName: {{ include "common.storageClass" . }}
 229       resources:
 230         requests:
 231           # upstream recommended max is 700M
 232           storage: "{{ .Values.persistence.storage }}"
 233   {{- else }}
 234       volumes:
 235       - name: {{ include "common.fullname" . }}-data
 236       {{- if .Values.memoryMode }}
 237         emptyDir:
 238           medium: Memory
 239       {{- else }}
 240         emptyDir: {}
 241       {{- end }}
 242   {{- end }}