Xen managed by libvirt in openstack 遇到问题
Openstack官方描述：问题
libvirtError: POST operation failed: xend_post: error from xen daemon: (xend.err 'Device /dev/xvdp (51952, tap) is already connected.')
https://github.com/openstack/nova/commit/35c4962c0b97bae5b8751d316d5822fe22c1ab6a
修改后创建虚拟机时仍是err
$ nova list
+--------------------------------------+---------------+---------+----------+
| ID | Name | Status| Networks |
+--------------------------------------+---------------+---------+----------+
| 136c56da-c827-497b-b8b9-bc7b3f0592bf | cirros1 | ERROR | | 将image文件改成raw格式，并手工修改libvirt.xml后：
<domain type="xen">
<uuid>47c3dee4-4a0f-4e43-b3b2-360994c39eb6</uuid>
<name>instance-00000003</name>
<memory>131072</memory>
<vcpu>2</vcpu>
<os>
<type>xen</type>
<root>/dev/xvda</root>
<boot dev="hd"/>
</os>
<features>
<acpi/>
</features>
<clock offset="utc"/>
<devices>
<disk type="file" device="disk">
- <driver name="file" type="qcow2" cache="none"/>
+ <driver name="file" type="raw" cache="none"/>
<source file="/var/lib/nova/instances/instance-00000003/disk"/>
- <target bus="xen" dev="sda"/>
+ <target bus="xen" dev="xvda"/>
</disk>
<disk type="file" device="disk">
- <driver name="file" type="qcow2" cache="none"/>
+ <driver name="file" type="raw" cache="none"/>
<source file="/var/lib/nova/instances/instance-00000003/disk.swap"/>
- <target bus="xen" dev="sdb"/>
+ <target bus="xen" dev="xvdb"/>
</disk>
<console type="pty"/>
<graphics type="vnc" autoport="yes" keymap="en-us" listen="172.16.100.1"/>
</devices>
</domain>
$ nova start cirros1
$ nova list
+--------------------------------------+---------------+---------+----------+
| ID | Name | Status| Networks |
+--------------------------------------+---------------+---------+----------+
| 136c56da-c827-497b-b8b9-bc7b3f0592bf | cirros1 | ACTIVE | | # virsh console instance-00000003
____ ________
/ __/ __ ____ ____ / __ \/ __/
/ /__ / // __// __// /_/ /\ \
\___//_//_//_/ \____/___/
http://launchpad.net/cirros
login as 'cirros' user. default password: 'cubswin:)'. use 'sudo' for root.
cirros login: 可是，总不能每次都手工修改吧，查阅官方文档后找到了问题的解决办法：
错误原因：
想要nova正确地生成xml配置文件，仅在nova配置文件（/etc/nova/nova.conf）中关于xen的配置使用下面几个参数是不够的，生成的配置文件在image文件格式（默认qcow2而openstack中Xen不支持）和磁盘名称(sdX)上都不对
# COMPUTE
libvirt_type=xen
connection_type=libvirt
compute_driver=libvirt.LibvirtDriver 至少应该这样指定：
# COMPUTE
libvirt_type=xen
connection_type=libvirt
compute_driver=libvirt.LibvirtDriver
libvirt_disk_prefix=xvd
libvirt_images_type=raw 重启服务：
$ for svc in api compute network cert console scheduler; do service openstack-nova-$svc restart; done 创建虚拟机实例：
$ nova boot --flavor 6 --image `nova image-list | grep cirros-0.3.0-x86 | awk '{print $2}'` --key_name testkey --security_group default cirros1 虚拟机正常启动：
$ nova list
+--------------------------------------+---------+--------+----------------------+
| ID | Name | Status | Networks |
+--------------------------------------+---------+--------+----------------------+
| bfdab37b-5419-47c0-90cc-9112000ba4d1 | cirros1 | ACTIVE | private=172.16.200.4 |
+--------------------------------------+---------+--------+----------------------+ ip及key都正常
$ ssh cirros@172.16.200.4
$ df -h
Filesystem Size Used Available Use% Mounted on
/dev 51.9M 0 51.9M 0% /dev
/dev/xvda1 23.2M 12.9M 9.1M59% /
tmpfs 56.1M 0 56.1M 0% /dev/shm
tmpfs 200.0K 20.0K 180.0K10% /run
$ whoami
cirros
$ 配置文件：
# cat instance-00000002/libvirt.xml
<domain type="xen">
<uuid>bfdab37b-5419-47c0-90cc-9112000ba4d1</uuid>
<name>instance-00000002</name>
<memory>131072</memory>
<vcpu>2</vcpu>
<os>
<type>xen</type>
<root>/dev/xvda</root>
<boot dev="hd"/>
</os>
<features>
<acpi/>
</features>
<clock offset="utc"/>
<devices>
<disk type="file" device="disk">
<driver name="file" type="raw" cache="none"/>
<source file="/var/lib/nova/instances/instance-00000002/disk"/>
<target bus="xen" dev="xvda"/>
</disk>
<interface type="bridge">
<mac address="fa:16:3e:4a:01:b3"/>
<source bridge="br100"/>
<filterref filter="nova-instance-instance-00000002-fa163e4a01b3">
<parameter name="IP" value="172.16.200.4"/>
<parameter name="DHCPSERVER" value="172.16.200.3"/>
<parameter name="PROJNET" value="172.16.200.0"/>
<parameter name="PROJMASK" value="255.255.255.0"/>
</filterref>
</interface>
<console type="pty"/>
<graphics type="vnc" autoport="yes" keymap="en-us" listen="172.16.100.1"/>
</devices>
</domain>
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