You have created a Kubernetes workload, e.g. Deployment, that uses a PersistentVolume and a PersistentVolumeClaim. It’s provisioned by your cloud platform, say, DigitalOcean. You want to know what space is available to you, you want to browse files and directories on your Volume, and you want to copy something from the Volume to your host machine. How do you do it?
First, find out your pvc’s mountPath. Your data sits there. Second, you can access it from the pod that uses the PersistentVolumeClaim. Fire up a terminal on the pod and use your favourite tools like ls and df to list files or see stats of the volume usage. Just make sure that an image your pod container is using has all the tools you need.
# open bash on the pod $ kubectl exec -it redis-master-0 bash # see disk usage stats # volume is mounted under /data I have no name!@redis-master-0:/$ df -h Filesystem Size Used Avail Use% Mounted on overlay 158G 6.5G 145G 5% / tmpfs 64M 0 64M 0% /dev tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/vda1 158G 6.5G 145G 5% /health /dev/disk/by-id/scsi-0DO_Volume_pvc-ae31a80d-7b23-11e9-bffb-0ab3124b7b1c 7.9G 36M 7.4G 1% /data shm 64M 0 64M 0% /dev/shm tmpfs 3.9G 12K 3.9G 1% /run/secrets/kubernetes.io/serviceaccount tmpfs 3.9G 0 3.9G 0% /proc/acpi tmpfs 3.9G 0 3.9G 0% /sys/firmware # list files $ ls -l /data total 24 -rw-r--r-- 1 1001 1001 130 May 20 18:23 appendonly.aof -rw-r--r-- 1 1001 1001 175 May 20 17:22 dump.rdb drwxrws--- 2 root 1001 16384 May 20 17:22 lost+found
Third, you can copy files or directories from or to a Kubernetes pod using kubectl cp:
kubectl cp default/redis-master-0:/data/dump.rdb /home/vitaly/Downloads/dump.rdb
See kubectl cp --help for more details.