처음 본 오픈 스택 Glance

오픈 스택의 Glance(https://docs.openstack.org/glance/latest/contributor/architecture.html)를 사용하면 운영체제 템플릿 이미지를 등록할 수 있다. 이미지 등록, 삭제, 변경등을 api를 통해 진행할 수 있다. 

Glance API 서버를 통해 controller를 지나 Registry Layer에서 Glance DB를 사용하는 구조이다. 

출처 : https://docs.openstack.org/glance/latest/contributor/architecture.html

이미지 포맷은 https://docs.openstack.org/image-guide/image-formats.html에서 볼 수 있듯이 다양하다.

많은 이미지와 컨테이너 타입을 지원하고 있다. 표로 설명하는 문서(https://platform9.com/support/supported-image-types-and-file-formats/)는 다음과 같다.

Format Type	Description	Supported By Platform9?	Our Comments
raw/img	An unstructured disk image format; if you have a file without an extension it is possibly a raw format.	Yes (given .raw, .img, .dat, .bin extensions)	Common extensions .raw, .img, .dat, .bin
qcow2	Supported by the QEMU emulator that can expand dynamically and supports Copy-on-Write	Yes	Most common file format used with Linux/KVM
vmdk	Common disk format supported by many common virtual machine monitors	Yes (for VMware vSphere hypervisor)	VMDK format is commonly associated with VMware
vdi	Supported by VirtualBox virtual machine monitor and the QEMU emulator	Not recommended(Will be recognized, but may or may not work depending on driver availability)	VirtualBox image files in practice may or may not work with Linux/KVM hypervisor. You might run into compatibility issues due to missing required virtualization drivers)
iso	An archive format for the data contents of an optical disc, such as CD-ROM	Yes
aki	An Amazon kernel image	No	Amazon image types are not popularly used with Linux/KVM
ari	An Amazon ramdisk image	No	Amazon image types are not popularly used with Linux/KVM
ami	An Amazon machine image	No	Amazon image types are not popularly used with Linux/KVM
vhd	The VHD disk format, a common disk format used by virtual machine monitors from VMware, Xen, Microsoft, VirtualBox, and others	No	Not a popular image format

우분투 OS이미지를 생성하는 방법(아마도 구 버전이겠지만.) 대충 이렇다.

(출처 : http://lollyrock.com/articles/glance-image-create/)

glance image-create --name 'Ubuntu 14.04 LTS' \ --container-format bare \ --disk-format qcow2 \ --is-public true \ --copy-from http://uec-images.ubuntu.com/releases/14.04/release/ubuntu-14.04-server-cloudimg-amd64-disk1.img +------------------+--------------------------------------+ | Property | Value | +------------------+--------------------------------------+ | checksum | None | | container_format | bare | | created_at | 2014-04-02T13:16:20 | | deleted | False | | deleted_at | None | | disk_format | qcow2 | | id | aa5ab6de-e461-4330-136e-fb149802bdc0 | | is_public | True | | min_disk | 0 | | min_ram | 0 | | name | Ubuntu 14.04 LTS Beta 1 | | owner | 9ab2f1a7ca521eee9c8de5a14567d377 | | protected | False | | size | 261095936 | | status | queued | | updated_at | 2014-04-02T13:16:20 | +------------------+--------------------------------------+

glance 슬라이드 자료.

OpenStack Glance from Deepti Ramakrishna