1. How Terraform Manages Resource State After running terraform init, Terraform downloads the dependent plugins into a local plugins directory. 1 2 3 4 5 6 7 8 9 10 11 12 13 tree -aL 5 . |-- myresource.tf |-- .terraform | `-- plugins | |-- registry.terraform.io | | |-- hashicorp | | | `-- null | | `-- shaowenchen | | `-- qingcloud | `-- selections.

Earlier, in Kubernetes Volumes, we got some understanding of Volumes. This post focuses on practice, learning how to use the three local storage options: emptydir, hostpath, and localvolume. 1. Basic Properties of a PV 1.1 PV Lifecycle PV states: Available: available, not yet bound by any PVC Bound: already bound to a PVC Released: the PVC was deleted, but the resource has not yet been reclaimed Failed: automatic reclamation failed 1.

1. Different Kinds of Storage 1.1 File Storage File storage is storage based on files. When accessing data, you need to provide the corresponding lookup path. It is suitable for services such as FTP and NFS. 1.2 Block Storage Block storage splits data into blocks and stores each part separately. When accessing data, the underlying storage software reassembles these scattered pieces.

1. Docker Storage Volumes 1.2 Volumes in Docker A Docker volume mounts a host directory into a container. Files modified inside the container are persisted to the host. Even if the container is deleted, the files on the host are retained. Docker uses /var/lib/docker/volumes/ to store container volumes. List local volumes:

NFS (Network File System) is used to share directories over the network; once the client mounts them, they can be read and written like a local disk. This post covers deploying an NFS service on CentOS and Ubuntu, and how to mount a remote NFS directory on each system. 1.