This Notebook is an example session launching a sample IPython cluster in the Joyent Public Cloud.
It is a part of a blog post on automatic deployment of an IPython parallel compute cluster on Joyent, so contextual details are there.
You should install the Python SmartDC libraries first with:
pip install smartdc
import time, sys
import json
from smartdc import DataCenter
import paramiko
Select your datacenter, select your username and key identifier:
sdc = DataCenter('eu-ams-1', key_id='/username/keys/keyname', verbose=True)
I chose the most up-to-date base 64-bit image and the smallest package available.
The boot script is available on this gist.
ipc = sdc.create_machine(dataset='sdc:sdc:base64:', package='Extra Small 512 MB',
tags={'cluster': 'ipython', 'role': 'controller'},
boot_script='./startup-controller.sh', name='ipcontroller')
ipc.poll_until('running')
2013-03-07T10:07:49.372832 POST https://eu-ams-1.api.joyentcloud.com/my/machines 2013-03-07T10:07:58.617559 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:08:02.459808 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:08:05.942330 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:08:09.668697 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:08:13.213666 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:08:16.890286 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:08:20.323838 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:08:23.840497 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:08:27.553048 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:08:31.015873 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7
This function is a roadblock, pausing further operation until the boot script completely finishes running, and we have some confidence that the controller’s engine configurations have been written.
def wait_for_svc(connection, fmri, interval=3, timeout=315):
SERVICE_POLL = 'svcs -H -o STA,NSTA %s' % fmri
for _ in xrange(timeout//interval):
states = tuple(connection.exec_command(SERVICE_POLL)[1].read().strip().split())
if states == ('ON', '-'):
print >>sys.stderr
return True
elif states == ('MNT', '-'):
raise StandardError('Bootscript failed: now in maintenance mode')
elif states == ('OFF', 'ON'):
# heartbeat
print >>sys.stderr, '.',
else:
# slightly unusual state
print >>sys.stderr, '?',
time.sleep(interval)
raise StandardError('Timeout')
ssh_conn = paramiko.SSHClient()
ssh_conn.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_conn.connect(ipc.public_ips[0], username='root')
wait_for_svc(ssh_conn, 'svc:/smartdc/mdata:execute')
True
The key command in this sequence is the following, where we retrieve the metadata that the engines need in order to connect to the engine.
_, rout, _ = ssh_conn.exec_command('cat /opt/local/share/ipython/profile_default/security/ipcontroller-engine.json')
ipcontroller = json.load(rout)
This is similar to the controller provisioning, except that it uses the engine boot script from the gist linked above, it defines a different role, and doesn't bother naming the engines.
for _ in xrange(4):
sdc.create_machine(dataset='sdc:sdc:base64:',
package='Extra Small 512 MB',
metadata={'ipython.url': ipcontroller['url'],
'ipython.key': ipcontroller['exec_key']},
tags={'cluster': 'ipython', 'role': 'engine'},
boot_script='./startup-engine.sh')
2013-03-07T10:11:45.336342 POST https://eu-ams-1.api.joyentcloud.com/my/machines 2013-03-07T10:12:13.032310 POST https://eu-ams-1.api.joyentcloud.com/my/machines 2013-03-07T10:12:19.690627 POST https://eu-ams-1.api.joyentcloud.com/my/machines 2013-03-07T10:12:26.242430 POST https://eu-ams-1.api.joyentcloud.com/my/machines
ipc.public_ips
[u'37.153.99.232']
ssh_conn.close()
At this point, you could SSH into the IPython Controller node, and test your cluster. Note that the IPYTHONDIR environment variable should be set to /opt/local/share/ipython.
Once you have finished with the cluster, you will want to shut it down at some point. Here is a convenient way to delete the entire cluster:
cluster = sdc.machines(tags={'cluster': 'ipython'})
cluster
2013-03-07T10:12:33.045438 GET https://eu-ams-1.api.joyentcloud.com/my/machines
[<smartdc.machine.Machine: <ipcontroller> in <DataCenter: eu-ams-1>>, <smartdc.machine.Machine: <4eac1ad> in <DataCenter: eu-ams-1>>, <smartdc.machine.Machine: <d8f2ae6> in <DataCenter: eu-ams-1>>, <smartdc.machine.Machine: <19666c2> in <DataCenter: eu-ams-1>>, <smartdc.machine.Machine: <873fde1> in <DataCenter: eu-ams-1>>]
from operator import methodcaller
map(methodcaller('stop'), cluster)
2013-03-07T10:19:18.615269 POST https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:19:22.007255 POST https://eu-ams-1.api.joyentcloud.com/my/machines/c767e541-25a9-48c7-af2c-292a78489d7d 2013-03-07T10:19:23.819118 POST https://eu-ams-1.api.joyentcloud.com/my/machines/89b08e35-a7c5-44fc-90be-7056e802bdde 2013-03-07T10:19:25.664591 POST https://eu-ams-1.api.joyentcloud.com/my/machines/193f2748-7e7c-483d-8dde-3ffc73b1ed03 2013-03-07T10:19:27.198584 POST https://eu-ams-1.api.joyentcloud.com/my/machines/cc8addf7-baeb-4913-8f4b-5a0ba3aa4f76
[None, None, None, None, None]
map(methodcaller('poll_until', 'stopped'), cluster)
2013-03-07T10:19:28.741289 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:19:32.274923 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:19:35.843260 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:19:37.647634 GET https://eu-ams-1.api.joyentcloud.com/my/machines/c767e541-25a9-48c7-af2c-292a78489d7d 2013-03-07T10:19:39.183008 GET https://eu-ams-1.api.joyentcloud.com/my/machines/89b08e35-a7c5-44fc-90be-7056e802bdde 2013-03-07T10:19:40.722421 GET https://eu-ams-1.api.joyentcloud.com/my/machines/193f2748-7e7c-483d-8dde-3ffc73b1ed03 2013-03-07T10:19:42.255855 GET https://eu-ams-1.api.joyentcloud.com/my/machines/cc8addf7-baeb-4913-8f4b-5a0ba3aa4f76
[None, None, None, None, None]
map(methodcaller('delete'), cluster)
2013-03-07T10:19:43.798491 DELETE https://eu-ams-1.api.joyentcloud.com/my/machines/c8be2243-ae5d-413d-a568-d73ac9e07ff7 2013-03-07T10:19:45.330310 DELETE https://eu-ams-1.api.joyentcloud.com/my/machines/c767e541-25a9-48c7-af2c-292a78489d7d 2013-03-07T10:19:46.698550 DELETE https://eu-ams-1.api.joyentcloud.com/my/machines/89b08e35-a7c5-44fc-90be-7056e802bdde 2013-03-07T10:19:48.107172 DELETE https://eu-ams-1.api.joyentcloud.com/my/machines/193f2748-7e7c-483d-8dde-3ffc73b1ed03 2013-03-07T10:19:49.630606 DELETE https://eu-ams-1.api.joyentcloud.com/my/machines/cc8addf7-baeb-4913-8f4b-5a0ba3aa4f76
[None, None, None, None, None]
sdc.machines()
2013-03-07T10:20:15.112498 GET https://eu-ams-1.api.joyentcloud.com/my/machines
[]