I get "pod has unbound immediate PersistentVolumeClaims", and I don't know why. I run minikube v0.34.1 on macOS. Here are the configs:
es-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: elasticsearch
spec:
capacity:
storage: 400Mi
accessModes:
- ReadWriteOnce
hostPath:
path: "/data/elasticsearch/"
es-statefulset.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: es-cluster
spec:
serviceName: elasticsearch
replicas: 3
selector:
matchLabels:
app: elasticsearch
template:
metadata:
labels:
app: elasticsearch
spec:
containers:
- name: elasticsearch
image: docker.elastic.co/elasticsearch/elasticsearch-oss:6.4.3
resources:
limits:
cpu: 1000m
requests:
cpu: 100m
ports:
- containerPort: 9200
name: rest
protocol: TCP
- containerPort: 9300
name: inter-node
protocol: TCP
volumeMounts:
- name: data
mountPath: /usr/share/elasticsearch/data
env:
- name: cluster.name
value: k8s-logs
- name: node.name
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: discovery.zen.ping.unicast.hosts
value: "es-cluster-0.elasticsearch,es-cluster-1.elasticsearch,es-cluster-2.elasticsearch"
- name: discovery.zen.minimum_master_nodes
value: "2"
- name: ES_JAVA_OPTS
value: "-Xms256m -Xmx256m"
initContainers:
- name: fix-permissions
image: busybox
command: ["sh", "-c", "chown -R 1000:1000 /usr/share/elasticsearch/data"]
securityContext:
privileged: true
volumeMounts:
- name: data
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
volumeClaimTemplates:
- metadata:
name: data
spec:
accessModes: [ "ReadWriteOnce" ]
storageClassName: "standard"
resources:
requests:
storage: 100Mi
es-svc.yaml
kind: Service
apiVersion: v1
metadata:
name: elasticsearch
labels:
app: elasticsearch
spec:
selector:
app: elasticsearch
clusterIP: None
ports:
- port: 9200
name: rest
- port: 9300
name: inter-node
In order to make a volume accessed my many pods, the accessModes need to be "ReadWriteMany" . Also if each pod wants to have its own directory then subPath need to be used.
As the issue was resolved in comment section @Michael Böckling . Here is further information using-subpath
volumeMounts:
- name: data
mountPath: /usr/share/elasticsearch/data
subPath: $(POD_NAME)