git volumes

1. What is a docker volume?
2. What are Kubernetes volumes?
3. What is volume mount?
4. What is emptyDir volume?
5. Where are Docker volumes stored?
6. Where are my Docker volumes?
7. What is ephemeral volume?
8. How do I access Kubernetes volumes?
9. What is a Kubernetes secret?
10. What is volume and volume mount in Kubernetes?
11. How do I specify a Dockerfile volume?
12. What is persistent volume?

What is a docker volume?

Volumes are the preferred mechanism for persisting data generated by and used by Docker containers. While bind mounts are dependent on the directory structure and OS of the host machine, volumes are completely managed by Docker. ... You can manage volumes using Docker CLI commands or the Docker API.

What are Kubernetes volumes?

In Kubernetes, a volume can be thought of as a directory which is accessible to the containers in a pod. ... It supports any or all the containers deployed inside the pod of Kubernetes. A key advantage of Kubernetes volume is, it supports different kind of storage wherein the pod can use multiple of them at the same time.

What is volume mount?

A volume mount point is a drive or volume in Windows that is mounted to a folder that uses the NTFS file system. ... Volume mount points enable you to exceed the 26-drive-letter limitation. By using volume mount points, you can graft, or mount, a target partition onto a folder on another physical disk.

What is emptyDir volume?

emptyDir are volumes that get created empty when a Pod is created. While a Pod is running its emptyDir exists. If a container in a Pod crashes the emptyDir content is unaffected. Deleting a Pod deletes all its emptyDirs. There are several ways a Pod can be deleted.

Where are Docker volumes stored?

Volumes are stored in a part of the host filesystem which is managed by Docker ( /var/lib/docker/volumes/ on Linux). Non-Docker processes should not modify this part of the filesystem. Volumes are the best way to persist data in Docker.

Where are my Docker volumes?

• Finding the volumes. Volumes like this are internal to Docker and stored in the Docker store (which is usually all under /var/lib/docker ). ...
• Cleaning up unused volumes. ...
• "Empty" definitions in docker-compose.

What is ephemeral volume?

Ephemeral storage is the volatile temporary storage attached to your instances which is only present during the running lifetime of the instance. ... Ephemeral storage is ideally used for any temporary data such as cache, buffers, session data, swap volume etc.

How do I access Kubernetes volumes?

The access modes are:

1. ReadWriteOnce -- the volume can be mounted as read-write by a single node.
2. ReadOnlyMany -- the volume can be mounted read-only by many nodes.
3. ReadWriteMany -- the volume can be mounted as read-write by many nodes.

What is a Kubernetes secret?

Kubernetes Secrets let you store and manage sensitive information, such as passwords, OAuth tokens, and ssh keys. ... A Secret is an object that contains a small amount of sensitive data such as a password, a token, or a key. Such information might otherwise be put in a Pod specification or in an image.

What is volume and volume mount in Kubernetes?

A Volume is a directory with data that is accessible to all containers running in a pod and gets mounted into each containers filesystem. Its lifetime is identical to the lifetime of the pod. Decoupling the volume lifetime from the container lifetime allows the volume to persist across container crashes and restarts.

How do I specify a Dockerfile volume?

In Dockerfile you can specify only the destination of a volume inside a container. e.g. /usr/src/app . When you run a container, e.g. docker run --volume=/opt:/usr/src/app my_image , you may but do not have to specify its mounting point ( /opt ) on the host machine.

What is persistent volume?

A persistent volume is a piece of storage in a cluster that an administrator has provisioned. ... A persistent volume is a volume plug-in that has a lifecycle independent of any individual pod that uses the persistent volume.