(or Docker.qcow2) will increase up to the upper limit (currently set to 64 GiB), even if the filesystem It’s got even bigger! It seems that if you create and destroy files in a loop, the size of the Docker.raw Next if you re-create the “same” 1GiB file in the container again and then check the size again you will see: $ ls -s Docker.raw The file has not got any smaller! Whatever has happened to the file inside the VM, the host doesn’t seem to Then check the file on the host: $ ls -s Docker.raw If you switch back to the alpine container terminal and delete the file: / # rm -f 1GiB Note the increase in size from 9964528 to 12061704, where the increase of 2097176 512-byte sectors # dd if=/dev/zero of=1GiB bs=1048576 count=1024īack on the host check the file size again: $ ls -s Docker.raw Next start a container in a separate terminal and create a 1GiB file in it: $ docker run -it alpine sh Number of blocks used is not necessarily the same as the file “size”, as the file can be Note the use of -s which displays the number of filesystem blocks actually used by the file. To demonstrate the effect, first check the current size of the file on the host: $ cd ~/Library/Containers//Data/64-linux/ If Docker is used regularly, the size of the Docker.raw (or Docker.qcow2) can keep growing, So the Docker.raw (or Docker.qcow2) contain image and container data, written by the LinuxĮxt4 and overlay filesystems. Hard-coded sector size of the virtual disk device. The data will be written to byte offset x * 512 in the file Docker.raw where 512 is the Which configures hyperkit to emulate an AHCI disk device such that when the VM writes to sector x on the device, Top of an ext4 filesystem on top of the partition /dev/sda1. If the path is none of the above, then the operation is performed by the overlay filesystem, on.docker run -v orĭocker run -mount) then the open/ read/ write/… calls are forwarded and the file is accessed If the path is on a volume mapped from the host or from a remote server (via e.g.If the path is on a tmpfs filesystem, the file is created in memory.If a container creates or writes to a file then the effect depends on the path, for example: What’s in the Docker.raw (or Docker.qcow)? what’s in the Docker.raw (or Docker.qcow2).Over time this file can grow and become large. ~/Library/Containers//Data/64-linuxĭocker.qcow2 or Docker.raw, depending on the format. Single writable disk image stored on the Mac’s filesystem in the Linux container images run inside a VM using a custom hypervisor called
Docker on mac slow for mac#
Docker for Mac is a desktop app which allows building, testing and