Intelligent filesystem for container images
One example method includes transmitting a request for a container image to a registry, receiving metadata associated with the container image, wherein the metadata allows a controller to mount an empty filesystem on a host machine, starting a container from the container image without receiving all files associated with the container image, receiving files, from a container server, needed by the container based on an access sequence associated with the container. This allows a container to be started without downloading the entire container image and also conversed bandwidth by providing the files as needed based on the manner in which the container accesses files during execution.
1. A method, comprising:
generating an access sequence by a container server cooperating with a file system, wherein the access sequence identifies files needed by a container;
transmitting, by a local host, a request for a container image to a registry;
receiving metadata associated with the container image, wherein the metadata allows a controller to mount an empty filesystem on the local host;
starting the container from the container image without receiving all files associated with the container image;
receiving files, from the container server, needed by the container based on the access sequence associated with the container, wherein the files were deduplicated prior to being received by the local host;
running the container on the local host;
logging file accesses by the container at the local host;
transmitting the file accesses to the container server, wherein the file accesses are added to the access sequence by the container server.
2. The method of claim 1 , further comprising determining the access sequence for the container based on a simulation of the container at the registry.
3. The method of claim 1 , further comprising caching the container image at the local host.
4. The method of claim 1 , further comprising tracking file accesses by the container through a container lifetime.
5. The method of claim 1 , further comprising executing the container without having all files associated with the container.
6. The method of claim 1 , further comprising flattening the container image for transfer, wherein files not identified in the access sequence are not transmitted to the controller.
7. The method of claim 1 , further comprising mounting a remote filesystem to facilitate transmitting files for the container based on the access sequence.
8. The method of claim 1 , further comprising determining whether the container image or any layers thereof are cached at the local host.
9. The method of claim 1 , further comprising receiving a startup package that includes files for the container at startup.
10. A non-transitory storage medium having stored therein instructions that are executable by one or more hardware processors to perform operations comprising:
generating an access sequence by a container server cooperating with a file system, wherein the access sequence identifies files needed by a container;
transmitting, by a local host, a request for a container image to a registry;
receiving metadata associated with the container image, wherein the metadata allows a controller to mount an empty filesystem on the local host;
starting the container from the container image without receiving a II files associated with the container image;
receiving files, from the container server, needed by the container based on the access sequence associated with the container, wherein the files were deduplicated prior to being received by the local host;
running the container on the local host;
logging file accesses by the container at the local host;
transmitting the file accesses to the container server, wherein the file accesses are added to the access sequence by the container server.
11. The non-transitory storage medium of claim 10 , the operations further comprising determining the access sequence for the container based on a simulation of the container at the registry.
12. The non-transitory storage medium of claim 10 , the operations further comprising caching the container image at the local host.
13. The non-transitory storage medium of claim 10 , the operations further comprising tracking file accesses by the container through a container lifetime.
14. The non-transitory storage medium of claim 10 , the operations further comprising executing the container without having all files associated with the container.
15. The non-transitory storage medium of claim 10 , the operations further comprising flattening the container image for transfer, wherein files not identified in the access sequence are not transmitted to the controller.
16. The non-transitory storage medium of claim 10 , the operations further comprising mounting a remote filesystem to facilitate transmitting files for the container based on the access sequence.
17. The non-transitory storage medium of claim 10 , the operations further comprising determining whether the container image or any layers thereof are cached at
the local host.
18. The non-transitory storage medium of claim 10 , the operations further comprising receiving a startup package that includes files for the container at startup.