Ironic部署原理和实战

Principle

ironic原理
Ironic in CSDN

Operations

Redhat Doc

Ironic部署过程中会看到有两套kernel initrd , 需要知道他们是用于不同的目的。

一个是deploy image,

  • 必须包含ironic python agent
  • 作用是dd user image 到裸机的硬盘上。

一个是user image ,有2种:

  • partition image
    也叫做half imge,只是一个root partition , 在写到磁盘之后,裸机启动有2种方式:

    1. 从pxe启动,使用这个user image的kernel 和 ramdisk。
    2. 从硬盘启动,这个需要配置ironic node的local boot特性。
  • whole image

    1. 包括分区表和bootloader
    2. 在whole image写到磁盘之后,ironic就不管裸机的启动了,默认是从硬盘启动。

使用方式,参见:
https://docs.openstack.org/project-install-guide/baremetal/draft/configure-glance-images.html

How to Deploy user image ?

无论是使用Half user image, 还是Whole user image, 开始都是使用deploy Image去实现”将 user image 写入到 裸机的硬盘中“ 这一过程, 因此在部署时,要注意配置deploy image

ironic node-update node1 add \
 driver_info/deploy_kernel=$DEPLOY_KERNEL_ID \
 driver_info/deploy_ramdisk=$DEPLOY_RAMDISK_ID

deploy时是先启动一个小系统,然后将qcow2文件利用iscsi协议写入到硬盘中去。
这个小系统里面要有ironic python agent , 要 iscsi, dd qcow2 到磁盘。
参见

使用Half User Image

上传 half user-os image时,同时也要上传kernel和initrd, 这个image的property要带上kernel , initrd参数。

[root@cloud-sz-kolla-b13-01 ironic]# openstack image list |grep bm-user
| bea4a10b-5ff2-4105-955d-0e79358df311 | bm-user-half-centos6-initrd | active |
| 04a2d4e9-4da7-4870-88bc-71d9282aa622 | bm-user-half-centos6-kernel | active |
| e36a093d-cb18-4a72-bc7f-737502cb0f88 | bm-user-half-centos6-os     | active |
| b48ace11-cec3-4a30-8cdd-ee643cccde95 | bm-user-half-centos7-initrd | active |
| 6ab91df6-1ede-4cf5-b824-dd1680ef3860 | bm-user-half-centos7-kernel | active |
| e0750ab1-41d0-419f-a418-475b8a5591f0 | bm-user-half-centos7-os     | active |
| e5a3d158-dece-4fbd-ae3b-3bbf3077f560 | bm-user-whole-centos6-os    | active |
| bbc8e047-0ab3-4396-b3b4-1497992723eb | bm-user-whole-centos7-os    | active |

[root@cloud-b13-01 ironic]# openstack image show bm-user-half-centos7-os
+------------------+-----------------------------------------------------------------------------------------------------+
| Field            | Value                                                                                               |
+------------------+-----------------------------------------------------------------------------------------------------+
| checksum         | 7cbedc4d391e34bf24d5ad10727c512d                                                                    |
| container_format | bare                                                                                                |
| created_at       | 2017-11-17T02:54:53Z                                                                                |
| disk_format      | qcow2                                                                                               |
| file             | /v2/images/e0750ab1-41d0-419f-a418-475b8a5591f0/file                                                |
| id               | e0750ab1-41d0-419f-a418-475b8a5591f0                                                                |
| min_disk         | 0                                                                                                   |
| min_ram          | 0                                                                                                   |
| name             | bm-user-half-centos7-os                                                                             |
| owner            | 21fe1bab6b494fab94e6fded5ebd893a                                                                    |
| properties       | kernel_id='6ab91df6-1ede-4cf5-b824-dd1680ef3860', ramdisk_id='b48ace11-cec3-4a30-8cdd-ee643cccde95' |
| protected        | False                                                                                               |
| schema           | /v2/schemas/image                                                                                   |
| size             | 570490880                                                                                           |
| status           | active                                                                                              |
| tags             |                                                                                                     |
| updated_at       | 2017-11-17T02:54:59Z                                                                                |
| virtual_size     | None                                                                                                |
| visibility       | public                                                                                              |
+------------------+-----------------------------------------------------------------------------------------------------+

使用whole image

Whole Image有什么好处呢? 什么时候适合使用Whole image ?
-> 不需要kernel, initrd文件(用于boot 裸机)
-> 方便安装Windows操作系统。

拿centos7 whole image做测试,deploy之前is_whole_disk_image是false , 之后变成了True

| driver_internal_info   | {u'agent_url': u'http://192.168.0.112:9999', u'root_uuid_or_disk_id':      |
|                        | u'0x000666fc', u'is_whole_disk_image': True}    

Local boot

Local boot是用于在ironic部署完裸机之后,控制裸机的启动方式,通常deploy完之后,裸机依然是pxe启动,参见doc
local boot就是指定从硬盘启动。

如果使用whole image,是否就不需要local boot ?
-》是的,测试发现,使用whole image时,加不加local boot特性都一样:默认都是从硬盘启动。

Whole disk images, on the contrary, support only local boot, and use it by default.

测试部署centos6 half image, 没有配置local boot,但还是报install bootloader failed的错误。

Ironic Inspect

inspect是用来在ironic部署时做硬件检测的, 如果裸机硬盘和网卡都正常,inspect过程是完全可以跳过去的。

inspect 之前

[root@cloud-sz-kolla-b13-01 ironic-deploy-test]# openstack hypervisor show 44e91a6a-4d7d-4f6e-812a-d3b626769b01+----------------------+--------------------------------------+
| Field                | Value                                |
+----------------------+--------------------------------------+
| aggregates           | [u'baremetal-hosts']                 |
| cpu_info             |                                      |
| current_workload     | 0                                    |
| disk_available_least | 10                                   |
| free_disk_gb         | 10                                   |
| free_ram_mb          | 4000                                 |
| host_ip              | 10.54.12.22                          |
| hypervisor_hostname  | 44e91a6a-4d7d-4f6e-812a-d3b626769b01 |
| hypervisor_type      | ironic                               |
| hypervisor_version   | 1                                    |
| id                   | 202                                  |
| local_gb             | 10                                   |
| local_gb_used        | 0                                    |
| memory_mb            | 4000                                 |
| memory_mb_used       | 0                                    |
| running_vms          | 0                                    |
| service_host         | cloud-sz-control-b12-02-ironic       |
| service_id           | 160                                  |
| state                | up                                   |
| status               | enabled                              |
| vcpus                | 1                                    |
| vcpus_used           | 0                                    |
+----------------------+--------------------------------------+

上面的内存,磁盘大小等数据是在添加ironic节点时手动指定的,

ironic node-update $node_name add \
   properties/cpus=1 \
   properties/memory_mb=4000 \
   properties/local_gb=10 \
   properties/cpu_arch="x86_64" \
   properties/capabilities="boot_option:local"  

inspect 之后

[root@cloud-sz-kolla-b13-01 ironic-deploy-test]# openstack hypervisor show 44e91a6a-4d7d-4f6e-812a-d3b626769b01+----------------------+--------------------------------------+
| Field                | Value                                |
+----------------------+--------------------------------------+
| aggregates           | [u'baremetal-hosts']                 |
| cpu_info             |                                      |
| current_workload     | 0                                    |
| disk_available_least | 221                                  |
| free_disk_gb         | 221                                  |
| free_ram_mb          | 524288                               |
| host_ip              | 10.54.12.22                          |
| hypervisor_hostname  | 44e91a6a-4d7d-4f6e-812a-d3b626769b01 |
| hypervisor_type      | ironic                               |
| hypervisor_version   | 1                                    |
| id                   | 202                                  |
| local_gb             | 221                                  |
| local_gb_used        | 0                                    |
| memory_mb            | 524288                               |
| memory_mb_used       | 0                                    |
| running_vms          | 0                                    |
| service_host         | cloud-sz-control-b12-02-ironic       |
| service_id           | 160                                  |
| state                | up                                   |
| status               | enabled                              |
| vcpus                | 112                                  |
| vcpus_used           | 0                                    |
+----------------------+--------------------------------------+

所以,如果追求真实的磁盘,内存数据,就不要跳过inspect过程。

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