使用Fabric进行Python部署

Question

我正在学习使用Fabric和Boto，到目前为止我已经成功登录并创建了一个新的实例。接下来，我想知道如何在下面的新服务器上使用Python在同一个fab文件中安装Gunicorn。

也就是说，我希望能够通过这个文件来获取新实例并安装包。

这是我的fab.py文件，目前的内容是：

SERVER_TYPES = {
                'web' : {
                       'image_id' : 'ami-xxxxxx',
                       'instance_type' : 't1.micro',
                       'security_groups' : [MAIN_SG],
                       'key_name' : MAIN_KP,
                        },
}



class EC2Conn:
    def __init__(self):
        print(_green("Started..."))
        self.ec2conn = None
        self.user = 'fabUser'
        self.access_key = 'xxxxxx'
        self.secret_key = 'xxxxxxxxxxxx'

    def connect(self):
        print(_green("Connecting..."))

        region = ec2.get_region('eu-west-1')
        self.ec2conn = ec2.connection.EC2Connection(self.access_key,
                          self.secret_key, region=region)


    def get_instances(self):
        return self.ec2conn.get_all_instances()


    def create_instance(self, instance_type='web', address=None):
                reservation = self.ec2conn.run_instances( **SERVER_TYPES[instance_type])
                print reservation
                instance = reservation.instances[0]
                time.sleep(10)
                while instance.state != 'running':
                        time.sleep(5)
                        instance.update()
                        print "Instance state: %s" % (instance.state)

                print "instance %s done!" % (instance.id)



def create_instance():
    a = EC2Conn()
    a.connect()
    return a.create_instance()

所以我想要的效果大概是这样的：

def install_stuff(using self.ec2conn)
      using ec2 instance
      run('pip install gunicorn')

   etc

Answer 1

我以前也做过类似的事情。我把我认为重要的部分结合在一起了。一旦设置好，你就可以通过传递一个主机列表来在一台或多台主机上运行fabric命令。希望这对你有帮助。

from fabric.api import *
import socket
socket.setdefaulttimeout(5)

# Setup fabric details
env.user         = 'fabric-user'
env.key_filename = '/root/.ssh/fabric_rsa'

def execute_remote(command):
    return run(command)

@parallel
def execute_remote_parallel(command):
    return run(command)

def run_fabric(cmd,hosts,in_parallel):
    """ Check the parameters and call the corresponding fabric block"""
    if in_parallel:
        return execute(execute_remote_parallel,command=cmd,hosts=hosts)
    else:
        return execute(execute_remote,command=cmd,hosts=hosts)

class FabricFunctions:    

    def stop_service(self,hosts,in_parallel,servicename):
        cmd = "sudo /sbin/service %s stop" % servicename
        run_fabric(cmd, hosts, in_parallel)

    def start_service(self,hosts,in_parallel,servicename):
        cmd = "sudo /sbin/service %s start" % servicename
        run_fabric(cmd, hosts, in_parallel)


#
#   Example - Untested!
#
f = FabricFunctions()
f.start_service("ec2-instance-ip",False,"httpd")

在fabric函数类中添加新方法来运行pip命令应该是非常简单的。