openstack 虚拟机迁移时应注意的问题

最新推荐文章于 2024-03-14 17:59:46 发布

韦远科

最新推荐文章于 2024-03-14 17:59:46 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/weiyuanke/article/details/8562123

本文详细介绍了虚拟机迁移过程中的关键步骤，包括主机名及hosts文件配置、libvirt的设置与权限管理，以及如何通过断开卷连接并复制磁盘到目标位置来实现虚拟机的平滑迁移。

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（1） hostname 以及hosts文件

（2）libvirt的配置以及权限

def migrate_disk_and_power_off(self, context, instance, dest,
                                   instance_type, network_info,
                                   block_device_info=None):
        LOG.debug(_("Starting migrate_disk_and_power_off"),
                   instance=instance)
        disk_info_text = self.get_instance_disk_info(instance['name'])
        disk_info = jsonutils.loads(disk_info_text)

        self.power_off(instance)

        block_device_mapping = driver.block_device_info_get_mapping(
            block_device_info)
        for vol in block_device_mapping:
            connection_info = vol['connection_info']
            mount_device = vol['mount_device'].rpartition("/")[2]
            self.volume_driver_method('disconnect_volume',
                                      connection_info,
                                      mount_device)

        # copy disks to destination
        # rename instance dir to +_resize at first for using
        # shared storage for instance dir (eg. NFS).
        same_host = (dest == self.get_host_ip_addr())
        inst_base = libvirt_utils.get_instance_path(instance)
        inst_base_resize = inst_base + "_resize"
        try:
            utils.execute('mv', inst_base, inst_base_resize)
            if same_host:
                dest = None
                utils.execute('mkdir', '-p', inst_base)
            else:
                utils.execute('ssh', dest, 'mkdir', '-p', inst_base) //需确保各主机之间可以无密码登陆
            for info in disk_info:
                # assume inst_base == dirname(info['path'])