IT automation appliance imaging system and method
View Patent ↗A system, method, and computer program product for harvesting an image from a local disk of a managed endpoint to an image library is provided. In an embodiment of the method for harvesting an image, a managed endpoint is provided with a boot image that causes the endpoint to instantiate a RAM disk and execute the boot image from the RAM disk. The boot image is used to harvest an image by determining data on a local disk of the managed endpoint to be included in the image that are not already stored in the image library. In one embodiment, this is done by comparing hashes calculated on the data on the local disk to hashes of data in the image library. The data not already stored in the image library are then copied to the image library.
1. A computer-implemented method for harvesting an image from a local disk of a managed endpoint to an image library, the method comprising:
providing the managed endpoint with a boot image via a network, the boot image causing the managed endpoint to instantiate a random access memory (RAM) disk in a memory of the endpoint, store the boot image in the RAM disk, and execute the boot image from the RAM disk;
identifying, by instructions stored in the boot image and executed from the RAM disk, data on the local disk to be included in the image;
determining, by instructions stored in the boot image and executed from the RAM disk, data on the local disk to be included in the image that are not already stored in the image library; and
copying, by instructions stored in the boot image and executed from the RAM disk, data not already stored in the image library from the local disk to the image library via the network.
2. The computer-implemented method of claim 1 , further comprising:
storing an endpoint manifest in the image library, the endpoint manifest comprising a directory structure and a list of file information blocks corresponding to files from the endpoint, each file information block comprising a file name, a hash, and a pointer to a file in the image library.
3. The computer-implemented method of claim 1 , wherein copying data not already stored in the image library from the local disk to the image library via the network further comprises:
calculating a candidate hash for each of a plurality of files on the local disk;
determining whether each candidate hash is equal to a stored hash corresponding to a file already contained in the image library; and
responsive to a candidate hash not being equal to any stored hash, copying the corresponding file from the local disk to the image library and storing the hash of the copied file in the image library.
4. The computer-implemented method of claim 1 , wherein the boot image is not stored on the local disk.
5. The computer-implemented method of claim 1 , wherein there are a plurality of managed endpoints coupled to the network and further comprising:
loading data common to the plurality of managed endpoints to the image library prior to determining data on the local disk that are not already stored in the image library.
6. The computer-implemented method of claim 1 , wherein data are files.
7. The computer-implemented method of claim 1 , further comprising:
the boot image accessing a software library stored on a machine other than the managed endpoint, the software library providing device drivers to enable the boot image to harvest an image from the local disk.
8. A computer-implemented method for deploying an image to a local disk of a managed endpoint from an image library, the method comprising: identifying an endpoint manifest, the manifest specifying data to be stored on the local disk of the managed endpoint to provide an application image;
providing the managed endpoint with a boot image via a network, the boot image causing the managed endpoint to instantiate a random access memory (RAM) disk in a memory of the endpoint, store the boot image in the RAM disk, and execute the boot image from the RAM disk;
deleting, by instructions stored in the boot image and executed from the RAM disk, data stored in the local disk that are not specified by the endpoint manifest;
obtaining via the network and by instructions stored in the boot image and executed from the RAM disk, data specified by the endpoint manifest that are not stored in the local disk;
writing to the local disk the data specified by the endpoint manifest that are not stored in the local disk; and
booting the endpoint from the local disk.
9. A computer program product having a computer-readable medium having computer program instructions recorded thereon for harvesting an image from a local disk of a managed endpoint to an image library, comprising:
a module for providing the managed endpoint with a boot image via a network, the boot image causing the managed endpoint to instantiate a random access memory (RAM) disk in a memory of the endpoint, store the boot image in the RAM disk, and execute the boot image from the RAM disk;
a module for identifying, by instructions stored in the boot image and executed from the RAM disk, data on the local disk to be included in the image;
a module for determining, by instructions stored in the boot image and executed from the RAM disk, data on the local disk to be included in the image that are not already stored in the image library; and
a module for copying, by instructions stored in the boot image and executed from the RAM disk, data not already stored in the image library from the local disk to the image library via the network.
10. The computer program product of claim 9 , further comprising:
a module for storing an endpoint manifest in the image library, the endpoint manifest comprising a directory structure and a list of file information blocks corresponding to files from the endpoint, each file information block comprising a file name, a hash, and a pointer to a file in the image library.
11. The computer program product of claim 9 , wherein copying data not already stored in the image library from the local disk to the image library via the network further comprises:
calculating a candidate hash for each of a plurality of files on the local disk;
determining whether each candidate hash is equal to a stored hash corresponding to a file already contained in the image library; and
responsive to a candidate hash not being equal to any stored hash, copying the corresponding file from the local disk to the image library and storing the hash of the copied file in the image library.
12. The computer program product of claim 9 , wherein there are a plurality of managed endpoints coupled to the network and further comprising:
a module for loading data common to the plurality of managed endpoints to the image library prior to determining data on the local disk that are not already stored in the image library.
13. The computer program product of claim 9 , wherein data are files.
14. The computer program product of claim 9 , further comprising:
a module in the boot image for accessing a software library, the software library stored on a machine other than the managed endpoint, the software library providing device drivers to enable the boot image to harvest an image from the local disk.