nova_libvirt怎么创建
时间: 2023-11-17 15:51:17 浏览: 46
要使用nova_libvirt创建虚拟机,你需要满足一定的要求。首先,你需要安装libvirt和QEMU,并且确保它们的版本符合Juno版本的要求。其次,你需要使用libvirt-python来与libvirt进行交互。然后,你可以使用nova/virt/libvirt/utils.py中的fetch_image方法来获取镜像并创建虚拟机。
相关问题
qpid架构图和nova服务进程图
qpid架构图是指用来描述Qpid消息代理系统的整体结构和组件之间的关系的图示。Qpid是一个实现了Advanced Message Queuing Protocol(AMQP)标准的开源消息代理系统,用于在分布式系统中进行可靠的消息传递和通信。Qpid架构图通常会包括以下几个主要组件:
1. Qpid Broker:消息代理,负责接收、路由和传递消息。它包含了Exchange、Queue、Binding等基本概念,并通过AMQP协议与其他组件进行通信。
2. Qpid Client:客户端,用于产生、发送和接收消息。它可以是生产者或消费者,与Qpid Broker建立连接,在不同的Exchange或Queue之间发送和接收消息。
3. Qpid Management Tools:用于管理和监控Qpid系统的工具。可以通过这些工具进行交互,查看和管理Broker和Client的状态、配置和性能信息等。
4. Qpid Routing功能:实现了消息的路由和转发功能,根据Exchange和Binding的配置,将消息从生产者传递到消费者。
5. Qpid 持久化存储:将消息保存到硬盘上,以便在系统故障后能够恢复消息的可靠性。
Nova服务进程图是指用来描述OpenStack中的Nova服务的组件和模块之间的关系的图示。Nova是OpenStack中的计算服务,负责管理和调度云中的虚拟机实例。Nova服务进程图包括以下几个主要组件:
1. Nova-api服务:接受来自用户和其他服务的Restful API请求,并将其转发给其他具体的服务进程进行处理。它与客户端之间通过API接口进行通信。
2. Nova-scheduler服务:负责虚拟机实例的调度和分配。根据云中的物理资源情况和调度策略,选择最合适的物理主机来部署虚拟机实例。
3. Nova-conductor服务:负责处理用户操作的审批和授权。它与数据库交互,管理虚拟机实例的状态和操作。
4. Nova-compute服务:管理和监控物理主机上运行的虚拟机实例。它与虚拟化技术(如KVM、Xen等)进行交互,通过控制接口(libvirt)管理虚拟机的创建、启动、停止和删除等操作。
5. Nova-network服务:提供虚拟网络的管理和配置。负责为虚拟机实例分配IP地址、创建网络拓扑等网络相关的操作。
6. Nova-volume服务:提供块存储服务,为虚拟机实例挂载块设备。
以上是对qpid架构图和nova服务进程图的简要描述,这些图示有助于理解系统的整体结构和组件的交互关系。
(1) OpenStack nova组件构成及其作用 (2)libvirt作用是什么? (3)如何部署rabbitmq (4)rabbitmq的五种消息使用方法是什么?代码如何测试 (5)rabbitmq 如何与 spring boot 集成
(1)OpenStack nova是一个用于管理云计算平台上虚拟机实例的组件,主要由以下几个子组件构成:
- nova-api:提供REST API接口,用于接收和处理用户请求。
- nova-scheduler:根据用户请求,选择最适合的物理主机进行虚拟机实例的创建。
- nova-conductor:协助nova-compute进行虚拟机实例的创建和管理。
- nova-compute:在物理主机上创建和管理虚拟机实例。
- nova-network:提供虚拟机实例的网络连接和管理功能。
(2)libvirt是一个用于管理虚拟化技术的工具,它提供了一组API接口,可以让管理程序通过这些接口来管理虚拟化环境。它主要的作用有:
- 提供了一套统一的API,可以管理多种虚拟化技术。
- 可以创建、启动、停止、暂停、恢复、删除虚拟机。
- 可以管理虚拟机的磁盘、网络、内存、CPU等资源。
- 提供了一些监控和调试工具,方便管理人员进行故障排查和性能调优。
(3)部署rabbitmq的步骤如下:
1. 安装Erlang环境
2. 安装RabbitMQ服务
3. 启动RabbitMQ服务
4. 配置管理员用户和虚拟主机
5. 配置RabbitMQ的权限和策略
6. 配置集群和镜像队列
(4)RabbitMQ的五种消息使用方法及测试代码如下:
- Point-to-Point (PTP)模式
发送消息的代码:
```python
import pika
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.queue_declare(queue='hello')
channel.basic_publish(exchange='', routing_key='hello', body='Hello World!')
print(" [x] Sent 'Hello World!'")
connection.close()
```
接收消息的代码:
```python
import pika
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.queue_declare(queue='hello')
def callback(ch, method, properties, body):
print(" [x] Received %r" % body)
channel.basic_consume(queue='hello', on_message_callback=callback, auto_ack=True)
print(' [*] Waiting for messages. To exit press CTRL+C')
channel.start_consuming()
```
- Publish/Subscribe模式
发送消息的代码:
```python
import pika
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.exchange_declare(exchange='logs', exchange_type='fanout')
message = 'Hello World!'
channel.basic_publish(exchange='logs', routing_key='', body=message)
print(" [x] Sent %r" % message)
connection.close()
```
接收消息的代码:
```python
import pika
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.exchange_declare(exchange='logs', exchange_type='fanout')
result = channel.queue_declare(queue='', exclusive=True)
queue_name = result.method.queue
channel.queue_bind(exchange='logs', queue=queue_name)
def callback(ch, method, properties, body):
print(" [x] %r" % body)
channel.basic_consume(queue=queue_name, on_message_callback=callback, auto_ack=True)
print(' [*] Waiting for messages. To exit press CTRL+C')
channel.start_consuming()
```
- Routing模式
发送消息的代码:
```python
import pika
import sys
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.exchange_declare(exchange='direct_logs', exchange_type='direct')
severity = sys.argv[1] if len(sys.argv) > 1 else 'info'
message = ' '.join(sys.argv[2:]) or 'Hello World!'
channel.basic_publish(exchange='direct_logs', routing_key=severity, body=message)
print(" [x] Sent %r:%r" % (severity, message))
connection.close()
```
接收消息的代码:
```python
import pika
import sys
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.exchange_declare(exchange='direct_logs', exchange_type='direct')
result = channel.queue_declare(queue='', exclusive=True)
queue_name = result.method.queue
severities = sys.argv[1:]
if not severities:
print("Usage: %s [info] [warning] [error]" % (sys.argv[0],))
sys.exit(1)
for severity in severities:
channel.queue_bind(exchange='direct_logs', queue=queue_name, routing_key=severity)
def callback(ch, method, properties, body):
print(" [x] %r:%r" % (method.routing_key, body))
channel.basic_consume(queue=queue_name, on_message_callback=callback, auto_ack=True)
print(' [*] Waiting for messages. To exit press CTRL+C')
channel.start_consuming()
```
- Topic模式
发送消息的代码:
```python
import pika
import sys
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.exchange_declare(exchange='topic_logs', exchange_type='topic')
routing_key = sys.argv[1] if len(sys.argv) > 2 else 'anonymous.info'
message = ' '.join(sys.argv[2:]) or 'Hello World!'
channel.basic_publish(exchange='topic_logs', routing_key=routing_key, body=message)
print(" [x] Sent %r:%r" % (routing_key, message))
connection.close()
```
接收消息的代码:
```python
import pika
import sys
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.exchange_declare(exchange='topic_logs', exchange_type='topic')
result = channel.queue_declare(queue='', exclusive=True)
queue_name = result.method.queue
binding_keys = sys.argv[1:]
if not binding_keys:
print("Usage: %s [binding_key]..." % (sys.argv[0],))
sys.exit(1)
for binding_key in binding_keys:
channel.queue_bind(exchange='topic_logs', queue=queue_name, routing_key=binding_key)
def callback(ch, method, properties, body):
print(" [x] %r:%r" % (method.routing_key, body))
channel.basic_consume(queue=queue_name, on_message_callback=callback, auto_ack=True)
print(' [*] Waiting for messages. To exit press CTRL+C')
channel.start_consuming()
```
- RPC模式
客户端发送请求的代码:
```python
import pika
import uuid
class FibonacciRpcClient(object):
def __init__(self):
self.connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
self.channel = self.connection.channel()
result = self.channel.queue_declare(queue='', exclusive=True)
self.callback_queue = result.method.queue
self.channel.basic_consume(queue=self.callback_queue, on_message_callback=self.on_response, auto_ack=True)
def on_response(self, ch, method, props, body):
if self.correlation_id == props.correlation_id:
self.response = body
def call(self, n):
self.response = None
self.correlation_id = str(uuid.uuid4())
self.channel.basic_publish(exchange='',
routing_key='rpc_queue',
properties=pika.BasicProperties(
reply_to=self.callback_queue,
correlation_id=self.correlation_id,
),
body=str(n))
while self.response is None:
self.connection.process_data_events()
return int(self.response)
fibonacci_rpc = FibonacciRpcClient()
print(" [x] Requesting fib(30)")
response = fibonacci_rpc.call(30)
print(" [.] Got %r" % response)
```
服务端处理请求的代码:
```python
import pika
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.queue_declare(queue='rpc_queue')
def fib(n):
if n == 0:
return 0
elif n == 1:
return 1
else:
return fib(n-1) + fib(n-2)
def on_request(ch, method, props, body):
n = int(body)
print(" [.] fib(%s)" % n)
response = fib(n)
ch.basic_publish(exchange='',
routing_key=props.reply_to,
properties=pika.BasicProperties(correlation_id = props.correlation_id),
body=str(response))
ch.basic_ack(delivery_tag=method.delivery_tag)
channel.basic_qos(prefetch_count=1)
channel.basic_consume(queue='rpc_queue', on_message_callback=on_request)
print(" [x] Awaiting RPC requests")
channel.start_consuming()
```
(5)RabbitMQ与Spring Boot集成的步骤如下:
1. 添加RabbitMQ依赖
在pom.xml文件中添加以下依赖:
```xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
```
2. 配置RabbitMQ连接
在application.properties文件中添加以下配置:
```
spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
```
3. 发送消息
```java
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class Sender {
private final RabbitTemplate rabbitTemplate;
@Autowired
public Sender(RabbitTemplate rabbitTemplate) {
this.rabbitTemplate = rabbitTemplate;
}
public void send(String message) {
rabbitTemplate.convertAndSend("hello", message);
}
}
```
4. 接收消息
```java
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
public class Receiver {
@RabbitListener(queues = "hello")
public void receive(String message) {
System.out.println("Received: " + message);
}
}
```