Openstack架设使用中问题汇总

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2012-04-23 18:42:55 CRITICAL nova [-] Unable to allow access for disk path /dev/disk/by-path/ip-192.168.1.14:3260-iscsi-iqn.2010-10.org.openstack:volume-00000002-lun-1: No such file or directory

这会导致nova-conpute无法正常运行,造成错误的原因有2，一是设置了compute在启动的时候自动启动（自动恢复）instance状态；二是使用nova-volume后重启服务（此时compute会自动恢复instance状态),就会出现找不到volume的错误。

解决方案：

                                                    
修改 /etc/nova.conf，注释两个选项：
#start_guests_on_host_boot = True
#resume_guests_state_on_host_boot =True
以后就手动启动instance比较稳定。

                                                
查看/dev/disk/by-path/下的文件
root@Controller:~# ls -l /dev/disk/by-path/
total 0
lrwxrwxrwx 1 root root  9 Apr 23 21:17 pci-0000:00:1f.2-scsi-0:0:0:0 -> ../../sda
lrwxrwxrwx 1 root root 10 Apr 23 21:17 pci-0000:00:1f.2-scsi-0:0:0:0-part1 -> ../../sda1
lrwxrwxrwx 1 root root 10 Apr 23 21:17 pci-0000:00:1f.2-scsi-0:0:0:0-part2 -> ../../sda2
lrwxrwxrwx 1 root root 10 Apr 23 21:17 pci-0000:00:1f.2-scsi-0:0:0:0-part5 -> ../../sda5
lrwxrwxrwx 1 root root 10 Apr 23 21:17 pci-0000:00:1f.2-scsi-0:0:0:0-part6 -> ../../sda6

发现都是符号链接，执行：

                                                                                       
root@Controller:~# tgtadm --lld iscsi --op show --mode target
Target 2: iqn.2010-10.org.openstack:volume-00000003
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00020000
            SCSI SN: beaf20
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags: 
        LUN: 1
            Type: disk
            SCSI ID: IET     00020001
            SCSI SN: beaf21
            Size: 10737 MB, Block size: 512
            Online: Yes
            Removable media: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/nova-volumes/volume-00000003

找到相应确实的东西，手动在by-path下建立链接，重启nova-compute服务即可。