我正在尝试设置一个弹性搜索有状态集。我意识到有人问过一些类似的问题，但在我的情况下没有帮助。
设置 elasticsearch 有状态集的第一个版本在以下配置下工作正常：
apiVersion: v1
kind: PersistentVolume
metadata:
name: elasticsearch-volume
labels:
type: local
spec:
storageClassName: do-block-storage
capacity:
storage: 100M
accessModes:
- ReadWriteOnce
hostPath:
path: "/data/elasticsearch"
---
apiVersion: v1
kind: PersistentVolumeClaim # Create PVC
metadata:
name: elasticsearch-volume-claim # Sets PVC's name
labels:
app: elasticsearch # Defines app to create PVC for
spec:
storageClassName: do-block-storage
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 100M # Sets PVC's size
---
apiVersion: v1
kind: Service
metadata:
name: elasticsearch
spec:
type: ClusterIP
clusterIP: None
selector:
app: elasticsearch
ports:
- port: 9200 # To get at the elasticsearch container, just hit the service on 9200
targetPort: 9200 # routes to the exposed port on elasticsearch
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: elasticsearch # name of stateful
namespace: default
spec:
serviceName: elasticsearch
replicas: 1
selector:
matchLabels:
app: elasticsearch # should match service > spec.slector.app.
template:
metadata:
labels:
app: elasticsearch
spec:
volumes:
- name: elasticsearch-pvc
persistentVolumeClaim:
claimName: elasticsearch-volume-claim
containers:
- name: elasticsearch
image: docker.elastic.co/elasticsearch/elasticsearch:8.2.3
resources:
limits:
cpu: 100m
requests:
cpu: 100m
ports:
- containerPort: 9200
name: rest
protocol: TCP
- containerPort: 9300
name: inter-node
protocol: TCP
volumeMounts:
- name: elasticsearch-pvc
mountPath: /usr/share/elasticsearch/data
env:
- name: cluster.name
value: search
- name: node.name
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: discovery.type
value: single-node
- name: ES_JAVA_OPTS
value: "-Xms512m -Xmx512m"
- name: xpack.security.enabled
value: "false"
initContainers:
- name: fix-permissions
image: busybox
command:
["sh", "-c", "chown -R 1000:1000 /usr/share/elasticsearch/data"]
securityContext:
privileged: true
volumeMounts:
- name: elasticsearch-pvc
mountPath: /usr/share/elasticsearch/data
- name: increase-vm-max-map
image: busybox
command: ["sysctl", "-w", "vm.max_map_count=262144"]
securityContext:
privileged: true
- name: increase-fd-ulimit
image: busybox
command: ["sh", "-c", "ulimit -n 65536"]
securityContext:
privileged: true
然后，我尝试使用多个副本实现此版本：
apiVersion: v1
kind: Service
metadata:
name: elasticsearch
spec:
type: ClusterIP
clusterIP: None
selector:
app: elasticsearch
ports:
- port: 9200 # To get at the elasticsearch container, just hit the service on 9200
targetPort: 9200 # routes to the exposed port on elasticsearch
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: es-cluster # name of stateful
spec:
serviceName: elasticsearch
replicas: 2
selector:
matchLabels:
app: elasticsearch # should match service > spec.slector.app.
volumeClaimTemplates:
- metadata:
name: elasticsearch-pvc
labels:
app: elasticsearch
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 100M
storageClassName: do-block-storage
template:
metadata:
labels:
app: elasticsearch
spec:
# volumes:
# - name: elasticsearch-pvc
# persistentVolumeClaim:
# claimName: elasticsearch-volume-claim
containers:
- name: elasticsearch
image: docker.elastic.co/elasticsearch/elasticsearch:8.2.3
resources:
limits:
cpu: 100m
requests:
cpu: 100m
ports:
- containerPort: 9200
name: rest
protocol: TCP
- containerPort: 9300
name: inter-node
protocol: TCP
volumeMounts:
- name: elasticsearch-pvc
mountPath: /usr/share/elasticsearch/data
env:
- name: cluster.name
value: search
- name: node.name
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: discovery.seed_hosts
value: "es-cluster-0.elasticsearch,es-cluster-1.elasticsearch,es-cluster-2.elasticsearch"
- name: cluster.initial_master_nodes
value: "es-cluster-0,es-cluster-1,es-cluster-2"
- name: ES_JAVA_OPTS
value: "-Xms512m -Xmx512m"
initContainers:
- name: fix-permissions
image: busybox
command:
["sh", "-c", "chown -R 1000:1000 /usr/share/elasticsearch/data"]
securityContext:
privileged: true
volumeMounts:
- name: elasticsearch-pvc
mountPath: /usr/share/elasticsearch/data
- name: increase-vm-max-map
image: busybox
command: ["sysctl", "-w", "vm.max_map_count=262144"]
securityContext:
privileged: true
- name: increase-fd-ulimit
image: busybox
command: ["sh", "-c", "ulimit -n 65536"]
securityContext:
privileged: true
但是我遇到了错误：0/2 nodes are available: 2 pod has unbound immediate PersistentVolumeClaims.
我随后将副本减少到只有 1 个并手动创建了 PV，以防 DO 在没有 PV 的情况下创建 PVC 时遇到问题(即使 DO 应该动态创建 PVC 和 PV，因为它适用于我以完全相同方式设置的 postgres 多副本有状态集)：
apiVersion: v1
kind: PersistentVolume
metadata:
name: es-volume-1
spec:
capacity:
storage: 100M
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Retain
storageClassName: do-block-storage
hostPath:
path: "/data/elasticsearch"
nodeAffinity:
required:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- es-cluster-0
这再次产生了错误：0/2 nodes are available: 2 pod has unbound immediate PersistentVolumeClaims.
在花了一段时间去窃听后，我放弃了，并决定使用我最初使用的方法恢复到我的单副本 elasticsearch 有状态集。
但是我再次得到错误0/2 nodes are available: 2 pod has unbound immediate PersistentVolumeClaims.!!!
我不知道这里发生了什么。为什么即使我只尝试创建单个副本并且我已经手动定义了以前工作正常的 PV 和 PVC，我也会收到此错误？
事实证明，这个问题确实是数字海洋特有的。在第二次尝试中，当我尝试创建多个副本时，我必须通过volumeClaimTemplates使用动态卷配置并将存储类设置为do-block-storage事实证明，其最小限制为 1Gi！
唉，当我更新到 1Gi 时，一切都开始工作了。