I am migrating an application that consists of 1 or more tomcat servers and 1 or more wildfly servers to k8s. I have it up and working with a deployments for tomcat and wildfly with a clusterIP for each. I am now trying to combine log files from the multiple nodes into a single log directory on the host (for now single host deployment). I have created a PVC with the following yaml files:
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer
reclaimPolicy: Delete
apiVersion: v1
kind: PersistentVolume
metadata:
name: local-pv
spec:
storageClassName: local-storage
capacity:
storage: 10Gi
accessModes:
- ReadWriteMany
persistentVolumeReclaimPolicy: Retain
hostPath:
path: /C/k8s/local-pv/logs
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: local-claim
spec:
accessModes:
- ReadWriteMany
storageClassName: local-storage
resources:
requests:
storage: 2Gi
I have the tomcat deployment mapped to the voles by:
apiVersion: apps/v1
kind: Deployment
metadata:
name: tomcat-deployment
spec:
replicas: 2
selector:
matchLabels:
component: tomcat-deployment
template:
metadata:
labels:
component: tomcat
spec:
initContainers:
- name: volume-mount-hack
image: busybox
command: ["sh", "-c", "chmod -R 777 /usr/local/tomcat/logs"]
volumeMounts:
- name: local-persistent-storage
mountPath: /usr/local/tomcat/logs
containers:
- name: tomcat
image: tomcat-full:latest
volumeMounts:
- name: local-persistent-storage
mountPath: /usr/local/tomcat/logs
subPath: tomcat
volumes:
- name: local-persistent-storage
persistentVolumeClaim:
claimName: local-claim
I startup all the components and the system is functioning as expected. However, when I look in the host directory C/k8s/local-pv/logs/tomcat, no files are showing. I connect to the tomcat pod with docker exec and I see the log files from both tomcat servers. The files shown in the /usr/local/tomcat/logs survive a deployment restart so I know they are written somewhere. I searched my entire hard drive and the files are not anywhere.
I checked the pvc, pv, and storage class
kubectl describe pvc local-claim
Name: local-claim
Namespace: default
StorageClass: local-storage
Status: Bound
Volume: local-pv
Labels: <none>
Annotations: pv.kubernetes.io/bind-completed: yes
pv.kubernetes.io/bound-by-controller: yes
Finalizers: [kubernetes.io/pvc-protection]
Capacity: 10Gi
Access Modes: RWX
VolumeMode: Filesystem
Mounted By: tomcat-deployment-644698fdc6-jmxz9
tomcat-deployment-644698fdc6-qvx9s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal WaitForFirstConsumer 12m (x3 over 14m) persistentvolume-controller waiting for first consumer to be created before binding
kubectl describe pv local-pv
Name: local-pv
Labels: <none>
Annotations: pv.kubernetes.io/bound-by-controller: yes
Finalizers: [kubernetes.io/pv-protection]
StorageClass: local-storage
Status: Bound
Claim: default/local-claim
Reclaim Policy: Retain
Access Modes: RWX
VolumeMode: Filesystem
Capacity: 10Gi
Node Affinity: <none>
Message:
Source:
Type: HostPath (bare host directory volume)
Path: /C/k8s/pv/logs
HostPathType:
Events: <none>
kubectl get storageclass local-storage
NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE
local-storage kubernetes.io/no-provisioner Delete WaitForFirstConsumer false 19m
What piece am I missing? It appears that the local storage class is not bound to a volume claim and tomcat application.