System Docker Volumes


A few services are containers in created state. Their purpose is to provide volumes for other services.

user-volumes

Provides user accessible persistent storage directories, used by console service:

/home
/opt

container-data-volumes

Provides docker storage directory, used by console service (and, indirectly, by docker)

/var/lib/docker

command-volumes

Provides necessary command binaries (read-only), used by system services:

/usr/bin/docker-containerd.dist
/usr/bin/docker-containerd-shim.dist
/usr/bin/docker-runc.dist
/usr/bin/docker.dist
/usr/bin/dockerlaunch
/usr/bin/system-docker
/sbin/poweroff
/sbin/reboot
/sbin/halt
/sbin/shutdown
/usr/bin/respawn
/usr/bin/ros
/usr/bin/cloud-init
/usr/sbin/netconf
/usr/sbin/wait-for-docker
/usr/bin/switch-console

system-volumes

Provides necessary persistent directories, used by system services:

/host/dev
/etc/docker
/etc/hosts
/etc/resolv.conf
/etc/ssl/certs/ca-certificates.crt.rancher
/etc/selinux
/lib/firmware
/lib/modules
/run
/usr/share/ros
/var/lib/rancher/cache
/var/lib/rancher/conf
/var/lib/rancher
/var/log
/var/run

all-volumes

Combines all of the above, used by the console service.

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