虚拟化平台cloudstack（8）——从UI开始

UI

ucloudstack采用的是前后端分离的架构，就是说前端可以选择使用web、swing甚至其它的界面，都可以。

我们来看cloudstack的UI信息吧，所有的cloudstack的UI都在{cloudstack_home}/cloudstack/ui目录下。

用firefox打开工程，打开firebug，找到login.js，在100行加上断点。

执行登录，这时就会触发断点，让我们看看发生了什么：

最终是使用jquery的ajax来提交post请求给服务器端，也就是说，manager server提供给我们的是一组API，我们可以通过http的请求方式提交请求。

处理http请求

看完了前端，我们继续看一下后端处理。

在web.xml中，我们看到所有的api/请求都会到ApiServlet中处理。

    <servlet>
        <servlet-name>apiServlet</servlet-name>
        <servlet-class>com.cloud.api.ApiServlet</servlet-class>
        <load-on-startup>5</load-on-startup>
    </servlet>

    <servlet-mapping>   
         <servlet-name>apiServlet</servlet-name>   
         <url-pattern>/api/*</url-pattern> 
    </servlet-mapping>

在ApiServlet中，重点看下

    @Override
    public void init(ServletConfig config) throws ServletException {
        SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this, config.getServletContext());
    }

这样在web容器中就可以查看spring中使用注解的接口了。

说实话这块感觉设计的挺一般的，一个servlet里边承担了太多的任务，我打了个断点在

processRequest(req, resp);

这个方法中，但是一个登录的操作就走了四次断点，一个退出操作又走了两次，不清楚这块为什么这样设计。

而且很多业务代码都在这个类中操作，感觉很冗余。但这个不是我们重点关心的问题。

CloudStack API提供的三种角色

1. 管​理​员​。​获​得​云​的​所​有​功​能​，包​括​虚​拟​和​物​理​资​源​管​理​。​
2. 域​管​理​员​。​进​入​到​虚​拟​资​源​的​云​属​于​管​理​员​的​域​。
3. 用​户​。​只​访​问​允​许​用​户​管​理​的​功​能​，虚​拟​实​例​，存​储​，和​网​络​。​

API文档的地址

http://cloudstack.apache.org/docs/api/

可以看到不同角色的API的地址，进去之后，可以看到每个API的详细描述。

处理简单列举一下4.1中API的新特性

在VM中重新配置物理网络

支持IPV6

扩展VMX设置

重新设置SSH密钥来访问虚拟机

在4.1中改变的API命令：

• isPersistent
• startipv6
• endipv6
• ip6gateway
• ip6cidr

listNetworkOfferings listNetworks The following request parameters have been added:

• isPersistent This parameter determines if the network or network offering listed are persistent or not.
• ip6gateway
• ip6cidr

createVlanIpRange The following request parameters have been added:

• startipv6
• endipv6
• ip6gateway
• ip6cidr

deployVirtualMachine The following parameter has been added: ip6Address. The following parameter is updated to accept the IPv6 address: iptonetworklist. CreateZoneCmd The following parameter have been added: ip6dns1, ip6dns2. listRouters listVirtualMachines For nic responses, the following fields have been added.

• ip6address
• ip6gateway
• ip6cidr

listVlanIpRanges For nic responses, the following fields have been added.

• startipv6
• endipv6
• ip6gateway
• ip6cidr

listRouters listZones For DomainRouter and DataCenter response, the following fields have been added.

• ip6dns1
• ip6dns2

addF5LoadBalancer configureNetscalerLoadBalancer addNetscalerLoadBalancer listF5LoadBalancers configureF5LoadBalancer listNetscalerLoadBalancers The following response parameter is removed: inline. listFirewallRules createFirewallRule The following request parameter is added: traffictype (optional). listUsageRecords The following response parameter is added: virtualsize. deleteIso The following request parameter is added: forced (optional). createStoragePool The following request parameters are made mandatory:

• podid
• clusterid

createAccount The following new request parameters are added: accountid, userid createUser The following new request parameter is added: userid createDomain The following new request parameter is added: domainid listZones The following request parameters is added: securitygroupenabled

同时添加了一些新的API

• createEgressFirewallRules (creates an egress firewall rule on the guest network.)
• deleteEgressFirewallRules (deletes a egress firewall rule on the guest network.)
• listEgressFirewallRules (lists the egress firewall rules configured for a guest network.)
• resetSSHKeyForVirtualMachine (Resets the SSHkey for virtual machine.)
• addBaremetalHost (Adds a new host.)
• addNicToVirtualMachine (Adds a new NIC to the specified VM on a selected network.)
• removeNicFromVirtualMachine (Removes the specified NIC from a selected VM.)
• updateDefaultNicForVirtualMachine (Updates the specified NIC to be the default one for a selected VM.)
• addRegion (Registers a Region into another Region.)
• updateRegion (Updates Region details: ID, Name, Endpoint, User API Key, and User Secret Key.)
• removeRegion (Removes a Region from current Region.)
• listRegions (List all the Regions. Filter them by using the ID or Name.)
• getUser (This API can only be used by the Admin. Get user details by using the API Key.)

配置8096端口

8096端​口​, 不​需​要​验​证​即​可​进​行​API调​用​. 在​所​有​的​3.0.1版​本​全​新​安​装​时​, 这​个​端​口​都​是​默​认​被​禁​用​的​. 你​可​以​通​过​下​面​的​设​置​启​用​8096(或​使​用​其​它​端​口​号​):

1. 确​保​第​一​个​管​理​服​务​器​安​装​并​运​行​.
2. 设​置​你​期​望​的​端​口​号​到​全​局​配​置​参​数​ integration.api.port.
3. 重​启​管​理​服​务​器​.
4. 在​管​理​服​务​器​的​节​点​上​, 创​建​一​个​防​火​墙​规​则​以​便​允​许​访​问​这​个​端​口​.

使用API请求

所​有​CloudStack API请​求​都​是​以​HTTP GET/POST形​式​提​交​, 同​时​附​上​相​关​的​命​令​和​参​数​. 无​论​是​HTTP或​HTTPS, 一​个​请​求​都​有​以​下​内​容​组​成​:

• CloudStack API URL: 这​是​Web服​务​API入​口​(例​如​, http://www.cloud.com:8080/client/api)
• 命​令​: 你​想​要​执​行​的​Web服​务​命​令​, 比​如​开​启​一​个​虚​拟​机​或​创​建​一​个​磁​盘​卷​
• 参​数​: 命​令​所​需​的​任​何​必​要​或​可​选​的​参​数​

一​个​API GET请​求​的​样​例​看​起​来​像​这​样​:

http://localhost:8080/client/api?command=deployVirtualMachine&serviceOfferingId=1&diskOfferingId=1&templateId=2&zoneId=4&apiKey=miVr6X7u6bN_sdahOBpjNejPgEsT35eXq-jB8CG20YI3yaxXcgpyuaIRmFI_EJTVwZ0nUkkJbPmY3y2bciKwFQ&signature=Lxx1DM40AjcXU%2FcaiK8RAP0O1hU%3D

更容易读的方式：

http://localhost:8080/client/api
?command=deployVirtualMachine
&serviceOfferingId=1
&diskOfferingId=1
&templateId=2
&zoneId=4 &apiKey=miVr6X7u6bN_sdahOBpjNejPgEsT35eXqjB8CG20YI3yaxXcgpyuaIRmFI_EJTVwZ0nUkkJbPmY3y2bciKwFQ
&signature=Lxx1DM40AjcXU%2FcaiK8RAP0O1hU%3D