- 使用官网实例代码,并不能新建client;
from novaclient import client
nova = client.Client(VERSION, USERNAME, PASSWORD, PROJECT_ID, AUTH_URL)
解决方法:
import novaclient.v2 as nvclient
from keystoneclient.auth.identity import v3
from keystoneclient import session
import os
def get_keystone_creds():
d = {}
d['username'] = 'USERNAME'
d['password'] = 'PASSWORD'
d['auth_url'] = 'http://controller:35357/v3'
d['project_name'] = 'admin'
d['project_domain_id'] = "default" d['user_domain_id'] = "default"
return d
def getNova():
kd_creds = get_keystone_creds()
auth = v3.Password(**kd_creds)
sess = session.Session(auth=auth)
nova = nvclient.client.Client(2,session=sess)
return nova
通过keystone建立会话认证,新建client客户端;
- 需要得到所有servers的详细信息;
解决方法:
(1)查看官方文档找到相应的python api;
(2)找到其响应结果,同时了解了其属性的意义;
在获取“OS-EXT-SRV-ATTR:host”的时候遇到了问题----报错:TypeError: 'Server' object has no attribute 'getitem';最后google到解决方法---通过getattr(ser,'accessIPv4') ,终于得到了想要的结果!!!其他扩展属性:“OS-EXT-SRV-ATTR:hypervisor_hostname”也可以通过这种方法得到。
from utils import *
nova = getNova()
servers = nova.servers.list(detailed=True)
for ser in servers:
print ser.id
print ser.name
print nova.images.get(ser.image['id']).name
print nova.flavors.get(ser.flavor['id']).name
print ser.key_name
print ser.status
print ser.created
print getattr(ser,'accessIPv4')
name = getattr(ser,'OS-EXT-SRV-ATTR:host')
print name
# print ser.availability_zone
# print ser["OS-EXT-SRV-ATTR:hypervisor_hostname"]
print ser.addresses['public'][0]['addr']
print ser.addresses
3. 想要找满足需求的api,然后想知道是怎么调用的?
解决方法:
(1)查看官方文档,介绍api的整体架构、分类,然后根据分类再详细去看,比如:我想通过得到所有的flavor,在文档中找“flavors”分类,在里面找到class novaclient.v2.flavors.FlavorManager(api) 里的list函数;
(2)查看github库里的源码;
(3)google;
- 感想
(1)官方文档应该是第一选择,通过官方文档可以很好地入门;我从一点不了解openstack、novaclient,通过查看novaclient的文档,能根据自己的需求找到相应的函数,并能调用,满足自己的需求,可以说明官方文档的重要性;
(2)English很重要:官方文档是英文的;英文搜索出的资料更全,解决方法更多;上面的解决方案都是通过英文搜索出来的!
(3)google很厉害;
(4)小窍门:如果不知道要搜索的内容的英文应该怎么写?我们可以通过谷歌翻译、有道翻译把中文翻译成英文,然后再改改,就能搜索出解决方案了哟!!!是不是很聪明?我都佩服我自己!!!
网友评论
其实就改了 api的名称
from novaclient import client
from keystoneauth1 import loading
from keystoneauth1 import session
import os
from utils import *
def get_keystone_creds():
d = {}
d['username'] = 'admin'
d['password'] = 'admin'
d['auth_url'] = 'http://192.168.192.148/identity/'
d['project_name'] = 'admin'
d['project_domain_id'] = "default"
d['user_domain_id'] = "default"
return d
def getNova():
kd_creds = get_keystone_creds()
loader = loading.get_plugin_loader('password')
auth = loader.load_from_options(**kd_creds)
sess = session.Session(auth=auth)
nova = client.Client(2,session=sess)
return nova
nova = getNova()
servers = nova.servers.list(detailed=True)
flavors = nova.flavors.list()