nova计算服务一直处于activating (start)

[root@node7 html]# systemctl status  openstack-nova-compute.service
● openstack-nova-compute.service - OpenStack Nova Compute Server
   Loaded: loaded (/usr/lib/systemd/system/openstack-nova-compute.service; enabled; vendor preset: disabled)
   Active: activating (start) since Fri 2019-08-16 11:01:37 CST; 4s ago
 Main PID: 10840 (nova-compute)
    Tasks: 1
   CGroup: /system.slice/openstack-nova-compute.service
           └─10840 /usr/bin/python2 /usr/bin/nova-compute

Aug 16 11:01:37 node7 systemd[1]: Starting OpenStack Nova Compute Server...
[root@node7 html]# systemctl status  openstack-nova-compute.service
● openstack-nova-compute.service - OpenStack Nova Compute Server
   Loaded: loaded (/usr/lib/systemd/system/openstack-nova-compute.service; enabled; vendor preset: disabled)
  Active: active (running) since Fri 2019-08-16 11:01:42 CST; 103ms ago
 Main PID: 10840 (nova-compute)
    Tasks: 22
   CGroup: /system.slice/openstack-nova-compute.service
           └─10840 /usr/bin/python2 /usr/bin/nova-compute

Aug 16 11:01:37 node7 systemd[1]: Starting OpenStack Nova Compute Server...
Aug 16 11:01:42 node7 systemd[1]: Started OpenStack Nova Compute Server.
[root@node7 html]# systemctl status  openstack-nova-compute.service
● openstack-nova-compute.service - OpenStack Nova Compute Server
   Loaded: loaded (/usr/lib/systemd/system/openstack-nova-compute.service; enabled; vendor preset: disabled)
   Active: activating (start) since Fri 2019-08-16 11:01:42 CST; 3s ago
 Main PID: 11077 (nova-compute)
    Tasks: 1
   CGroup: /system.slice/openstack-nova-compute.service
           └─11077 /usr/bin/python2 /usr/bin/nova-compute

Aug 16 11:01:42 node7 systemd[1]: Starting OpenStack Nova Compute Server...

nova compute服务一直在启动中

查看日志文件
[root@node7 nova]# tail -n 100 /var/log/nova/nova-compute.log

2019-08-16 11:02:42.607 13372 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/oslo_service/service.py", line 729, in run_service
2019-08-16 11:02:42.607 13372 ERROR oslo_service.service     service.start()
2019-08-16 11:02:42.607 13372 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/service.py", line 161, in start
2019-08-16 11:02:42.607 13372 ERROR oslo_service.service     self.manager.init_host()
2019-08-16 11:02:42.607 13372 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1149, in init_host
2019-08-16 11:02:42.607 13372 ERROR oslo_service.service     self.driver.init_host(host=self.host)
2019-08-16 11:02:42.607 13372 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 529, in init_host
2019-08-16 11:02:42.607 13372 ERROR oslo_service.service     self._version_to_string(MIN_QEMU_VERSION))
2019-08-16 11:02:42.607 13372 ERROR oslo_service.service InternalError: Nova requires QEMU version 2.1.0 or greater.
2019-08-16 11:02:42.607 13372 ERROR oslo_service.service

InternalError: Nova requires QEMU version 2.1.0 or greater
推断应该时QEMU版本问题

检查qemu版本：

 [root@node7 nova]# qemu-img --help | grep version
    qemu-img version 2.10.0(qemu-kvm-ev-2.10.0-21.el7_5.7.1)
    '-V', '--version'    output version information and exit
       conversion. If the number of bytes is 0, the source will not be scanned for     
 [root@node7 nova]# /usr/libexec/qemu-kvm -version
     QEMU emulator version 2.10.0(qemu-kvm-ev-2.10.0-21.el7_5.7.1)
    Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
 [root@node7 nova]# virsh -c qemu:///system version --daemon
    Compiled against library: libvirt 4.5.0
    Using library: libvirt 4.5.0
    Using API: QEMU 4.5.0
    Running hypervisor: QEMU 2.0.0
    Running against daemon: 4.5.0

运行的hypervisor的版本时QEMU 2.0.0 与已经安装的QEMU 2.10.0版本不一致，因此推断是这的问题：

解决方法
1.已经安装了所需要版本，但是Running hypervisor: QEMU xxx不一样

 [root@node7 nova]# sudo yum remove qemu-system-x86
 [root@node7 nova]# systemctl restart libvirtd.service
 [root@node7 nova]# virsh -c qemu:///system version --daemon
    Compiled against library: libvirt 4.5.0
    Using library: libvirt 4.5.0
    Using API: QEMU 4.5.0
    Running hypervisor: QEMU 2.10.0
    Running against daemon: 4.5.0
[root@node7 nova]# systemctl restart  openstack-nova-compute.service
[root@node7 nova]# systemctl status openstack-nova-compute
    ● openstack-nova-compute.service - OpenStack Nova Compute Server
    Loaded: loaded (/usr/lib/systemd/system/openstack-nova-compute.service; enabled; vendor preset: disabled)
    Active: active (running) since Fri 2019-08-16 11:19:27 CST; 11s ago
    Main PID: 23713 (nova-compute)
        Tasks: 22
    CGroup: /system.slice/openstack-nova-compute.service
            └─23713 /usr/bin/python2 /usr/bin/nova-compute

    Aug 16 11:19:22 node7 systemd[1]: Starting OpenStack Nova Compute Server...
    Aug 16 11:19:27 node7 systemd[1]: Started OpenStack Nova Compute Server.

2.没有安装所需要QEMU版本，则需要安装所需版本

    yum -y install gcc gcc-c++ automake libtool zlib-devel glib2-devel bzip2-devel libuuid-devel spice-protocol spice-server-devel usbredir-devel libaio-devel
    wget https://download.qemu.org/qemu-3.1.0-rc0.tar.xz
    tar xvJf qemu-3.1.0-rc0.tar.xz
    cd qemu-3.1.0-rc0
    ./configure
    make && make install
    
    ln -s /usr/local/bin/qemu-system-x86_64 /usr/bin/qemu-kvm
    ln -s /usr/local/bin/qemu-system-x86_64 /usr/libexec/qemu-kvm
    ln -s /usr/local/bin/qemu-img /usr/bin/qemu-img
    
    qemu-img --version
    qemu-kvm –version
    virsh -c qemu:///system version --daemon

原文链接：https://blog.csdn.net/qq_36163711/article/details/99674736