Lago SDK Example - one VM one Network



In [1]:

    
import logging
import tempfile
from textwrap import dedent
from lago import sdk

Create a LagoInitFile, normally this file should be saved to the disk. Here we will use a temporary file instead. Our environment includes one CentOS 7.3 VM with one network.



In [6]:

    
with tempfile.NamedTemporaryFile(delete=False) as init_file:
    init_file.write(dedent("""
    domains:
      vm-01:
        memory: 1024
        nics:
          - net: net-01
        disks:
          - template_name: el7.3-base
            type: template
            name: root
            dev: sda
            format: qcow2
    nets:
      net-01:
        type: nat
        dhcp:
          start: 100
          end: 254
        """))

Now we will initialize the environment by using the init file. Our workdir will be created automatically if it does not exists. If this is the first time you are running Lago, it might take a while as it will download the CentOS 7.3 template. You can monitor its progress by watching the log file we configured in /tmp/lago.log.



In [7]:

    
env = sdk.init(config=init_file.name,
              workdir='/tmp/lago_sdk_simple_example',
              loglevel=logging.DEBUG,
              log_fname='/tmp/lago.log')

When the method returns, the environment can be started:



In [8]:

    
env.start()

Check which VMs are available and get some meta data:



In [10]:

    
vms = env.get_vms()
print vms









    



{'vm-01': <lago.vm.DefaultVM object at 0x7f7375db6050>}



In [13]:

    
vm = vms['vm-01']









    Out[13]:





'192.168.202.2'



In [14]:

    
vm.distro()









    Out[14]:





u'el7'



In [19]:

    
vm.ip()









    Out[19]:





'192.168.202.2'

Executing commands in the VM can be done with ssh method:



In [20]:

    
res = vm.ssh(['hostname', '-f'])



In [21]:

    
res









    Out[21]:





CommandStatus(code=0, out='vm-01.lago.local\n', err='')

Lets stop the environment, here we will use the destroy method, however you may also use stop and start if you would like to turn the environment off.



In [22]:

    
env.destroy()