# AdditionalImageStores is used to pass paths to additional Read/Only image storesĪdditional image stores is a cool feature that allows you to set up additional read only stores of images.
Some of these allow you to do interesting things with containers storage, I will talk about some of them below. There are a lot of per graphdriver storage options.
FILE STORAGE CONTAINERS DRIVERS
# Storage options to be passed to underlying storage drivers No special tools are required to set up storage, you should set up storage in any manner that best fits your needs using standard Linux commands, but we recommend that you mount a large device on /var/lib/containers. We recommend that you set up a lot of space on this location, since people tend to store lots of images over time. The graph root, defines the location where the actual images will be stored. Graphroot = "/var/lib/containers/storage" # Primary Read/Write location of container storage If you accidentally use overlay2 in the config containers storage is smart enough to alias it to overlay. In Docker world there are two overlay drivers, overlay and overlay2, today most users use the overlay2 driver, so we just use that one, and called it overlay. In container/storage we default to the overlay driver. # The "container storage" table contains all of the server options. # that use the containers/storage library. # This file is is the configuration file for all tools If you are running rootless with a tool like Podman, then the nf file is stored in $HOME/.config/containers/nf.
For containers engines that run as root, the nf file is stored in /etc/containers/nf. Storage ConfigurationĬontainer storage configuration is defined in the nf file. For example you might use a CSI to store the database that is used by the MariaDB container image, which is stored in container/storage. Container/storage is about storing container images on COW file systems, while CSI is for the volumes that containers write to. Note that the container/storage library is not related to Container Storage Interface (CSI). These storage drivers implement different copy on write (COW) storage drivers including overlay, devicemapper, btrfs, xfs, vfs, aufs … If you want to use the library in a go project, then you just implement a store. The first step was to separate out the containers/storage under the Docker Project, called the graphdriver. We would use file system locking to control access to storage data. We wanted to allow multiple tools to use the storage at the same time, without needing to know about each other. When we began to create new container engines, the first thing we required was to build a new library containers/storage, which did not require a daemon to control it. The locking and manipulation had to be done within the daemon. The issue here was that the daemon did not know about this so if someone attempted to remove the image while we mounted it, the daemon would get confused. The container runtime team at Red Hat created the atomic mountcommand to mount images under Docker and this was used within atomic scan. After all a container image was just a mount point under devicemapper or overlay. We were working on the atomic tool and wanted a way to mount the container images so that we could scan them. The only realistic way someone could use the images was through the daemon. When I first started working with containers, one of the things I did not like about Docker’s architecture was that the daemon hid the information about the image store within itself. In this post, we’re going to look at how containers images are stored and some of the tools that you can use to work with those images directly - Podman, Skopeo, and Buildah. How containers are stored on disk is often a mystery to users working with the containers.
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