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
  15 apiVersion: apps/v1beta1
  16 kind: StatefulSet
  17 metadata:
  18   name: {{ include "common.fullname" .  }}
  19   labels:
  20     heritage: "{{ .Release.Service }}"
  21     release: "{{ .Release.Name }}"
  22     chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
  23     app: {{ include "common.name" . }}
  24 spec:
  25   serviceName: {{ include "common.servicename" .}}
  26   replicas: {{ .Values.replicaCount }}
  27   template:
  28     metadata:
  29       labels:
  30         heritage: "{{ .Release.Service }}"
  31         release: "{{ .Release.Name }}"
  32         chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
  33         app: {{ include "common.name" . }}
  34     spec:
  35 {{- if .Values.affinity }}
  36       affinity:
  37 {{ toYaml .Values.affinity | indent 8 }}
  38 {{- end }}
  39 {{- if .Values.nodeSelector }}
  40       nodeSelector:
  41 {{ toYaml .Values.nodeSelector | indent 8 }}
  42 {{- end }}
  43 {{- if .Values.tolerations }}
  44       tolerations:
  45 {{ toYaml .Values.tolerations | indent 8 }}
  46 {{- end }}
  47       containers:
  48       - name: {{ include "common.fullname" .  }}
  49         image: "{{ .Values.repository }}/{{ .Values.image }}"
  50         imagePullPolicy: "{{ .Values.pullPolicy }}"
  51         ports:
  52         - containerPort: {{ .Values.service.peerInternalPort }}
  53           name: {{ .Values.service.peerPortName }}
  54         - containerPort: {{ .Values.service.clientInternalPort }}
  55           name: {{ .Values.service.clientPortName }}
  56         {{- if eq .Values.liveness.enabled true }}
  57         livenessProbe:
  58           exec:
  59             command: ["/bin/sh", "-c", "etcdctl cluster-health | grep -w healthy" ]
  60             initialDelaySeconds: {{ .Values.liveness.initialDelaySeconds }}
  61             periodSeconds: {{ .Values.liveness.periodSeconds }}
  62             timeoutSeconds: {{ .Values.liveness.timeoutSeconds }}
  63           {{ end -}}
  64         readinessProbe:
  65           exec:
  66             command: ["/bin/sh", "-c", "etcdctl cluster-health | grep -w healthy" ]
  67             initialDelaySeconds: {{ .Values.readiness.initialDelaySeconds }}
  68             periodSeconds: {{ .Values.readiness.periodSeconds }}
  69         resources:
  70 {{ include "common.resources" . | indent 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" . }}
  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                 while true; do
 138                     echo "Waiting for ${SET_NAME}-${i}.${SERVICE_NAME} to come up"
 139                     ping -W 1 -c 1 ${SET_NAME}-${i}.${SERVICE_NAME} > /dev/null && break
 140                     sleep 1s
 141                 done
 142             done
 143
 144             # re-joining after failure?
 145             if [ -e /var/run/etcd/default.etcd ]; then
 146                 echo "Re-joining etcd member"
 147                 member_id=$(cat /var/run/etcd/member_id)
 148
 149                 # re-join member
 150                 ETCDCTL_ENDPOINT=$(eps) etcdctl member update ${member_id} http://${HOSTNAME}.${SERVICE_NAME}:2380 | true
 151                 exec etcd --name ${HOSTNAME} \
 152                     --listen-peer-urls http://0.0.0.0:2380 \
 153                     --listen-client-urls http://0.0.0.0:2379\
 154                     --advertise-client-urls http://${HOSTNAME}.${SERVICE_NAME}:2379 \
 155                     --data-dir /var/run/etcd/default.etcd
 156             fi
 157
 158             # etcd-SET_ID
 159             SET_ID=${HOSTNAME##*[^0-9]}
 160
 161             # adding a new member to existing cluster (assuming all initial pods are available)
 162             if [ "${SET_ID}" -ge ${INITIAL_CLUSTER_SIZE} ]; then
 163                 export ETCDCTL_ENDPOINT=$(eps)
 164
 165                 # member already added?
 166                 MEMBER_HASH=$(member_hash)
 167                 if [ -n "${MEMBER_HASH}" ]; then
 168                     # the member hash exists but for some reason etcd failed
 169                     # as the datadir has not be created, we can remove the member
 170                     # and retrieve new hash
 171                     etcdctl member remove ${MEMBER_HASH}
 172                 fi
 173
 174                 echo "Adding new member"
 175                 etcdctl member add ${HOSTNAME} http://${HOSTNAME}.${SERVICE_NAME}:2380 | grep "^ETCD_" > /var/run/etcd/new_member_envs
 176
 177                 if [ $? -ne 0 ]; then
 178                     echo "Exiting"
 179                     rm -f /var/run/etcd/new_member_envs
 180                     exit 1
 181                 fi
 182
 183                 cat /var/run/etcd/new_member_envs
 184                 source /var/run/etcd/new_member_envs
 185
 186                 collect_member &
 187
 188                 exec etcd --name ${HOSTNAME} \
 189                     --listen-peer-urls http://0.0.0.0:2380 \
 190                     --listen-client-urls http://0.0.0.0:2379 \
 191                     --advertise-client-urls http://${HOSTNAME}.${SERVICE_NAME}:2379 \
 192                     --data-dir /var/run/etcd/default.etcd \
 193                     --initial-advertise-peer-urls http://${HOSTNAME}.${SERVICE_NAME}:2380 \
 194                     --initial-cluster ${ETCD_INITIAL_CLUSTER} \
 195                     --initial-cluster-state ${ETCD_INITIAL_CLUSTER_STATE}
 196             fi
 197
 198             PEERS=""
 199             for i in $(seq 0 $((${INITIAL_CLUSTER_SIZE} - 1))); do
 200                 PEERS="${PEERS}${PEERS:+,}${SET_NAME}-${i}=http://${SET_NAME}-${i}.${SERVICE_NAME}:2380"
 201             done
 202
 203             collect_member &
 204
 205             # join member
 206             exec etcd --name ${HOSTNAME} \
 207                 --initial-advertise-peer-urls http://${HOSTNAME}.${SERVICE_NAME}:2380 \
 208                 --listen-peer-urls http://0.0.0.0:2380 \
 209                 --listen-client-urls http://0.0.0.0:2379 \
 210                 --advertise-client-urls http://${HOSTNAME}.${SERVICE_NAME}:2379 \
 211                 --initial-cluster-token etcd-cluster-1 \
 212                 --initial-cluster ${PEERS} \
 213                 --initial-cluster-state new \
 214                 --data-dir /var/run/etcd/default.etcd
 215         volumeMounts:
 216         - name: {{ include "common.fullname" . }}-data
 217           mountPath: /var/run/etcd
 218   {{- if .Values.persistence.enabled }}
 219   volumeClaimTemplates:
 220   - metadata:
 221       name: {{ include "common.fullname" . }}-data
 222     spec:
 223       accessModes:
 224         - "{{ .Values.persistence.accessMode }}"
 225       resources:
 226         requests:
 227           # upstream recommended max is 700M
 228           storage: "{{ .Values.persistence.storage }}"
 229       storageClassName: {{ include "common.fullname" . }}-data
 230   {{- else }}
 231       volumes:
 232       - name: {{ include "common.fullname" . }}-data
 233       {{- if .Values.memoryMode }}
 234         emptyDir:
 235           medium: Memory
 236       {{- else }}
 237         emptyDir: {}
 238       {{- end }}
 239   {{- end }}
 240