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ec2.py
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ec2.py
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#### ec2.py
#
# Simple EC2 cluster management with Python.
#
# Mostly a convenience wrapper around the boto library.
#
#### Possible future extensions
#
#
# Useage from the command line:
#
# python ec2.py create CLUSTER_NAME n type
#
# Create a cluster with name `CLUSTER_NAME`, containing `n` machines
# of type `type`.
#
#
# python ec2.py show_all
#
# Shows names of all clusters currently running, and some basic data.
#
#
# python ec2.py show CLUSTER_NAME
#
# Show details of named cluster, including the type of machines,
# indices for all machines, DNS, and instance numbers.
#
#
# python ec2.py add CLUSTER_NAME n
#
# Add n extra machines to CLUSTER_NAME.
#
#
# python ec2.py kill CLUSTER_NAME [n1 n2 n3...]
#
# Indices of the machines to kill in CLUSTER_NAME.
#
#
# python ec2.py shutdown CLUSTER_NAME
#
# Shutdown CLUSTER_NAME entirely
#
#
# python ec2.py shutdown_all
#
# Shutdown all clusters.
#
#
# python ec2.py ssh CLUSTER_NAME [n]
#
# ssh in to CLUSTER_NAME, to the instance with optional index n
# (default 0).
#
#
# Also exports an additional useful method:
#
# ec2.boto_object(CLUSTER_NAME, index=0)
#
# Returns the boto object for the instance represented by CLUSTER_NAME
# and index.
# Standard library
import os
import subprocess
import sys
import time
# Third party libraries
from boto.ec2.connection import EC2Connection
# The list of EC2 AMIs to use, from alestic.com
AMIS = {"m1.small" : "ami-e2af508b",
"c1.medium" : "ami-e2af508b",
"m1.large" : "ami-68ad5201",
"m1.xlarge" : "ami-68ad5201",
"m2.xlarge" : "ami-68ad5201",
"m2.2xlarge" : "ami-68ad5201",
"m2.4xlarge" : "ami-68ad5201",
"c1.xlarge" : "ami-68ad5201",
"cc1.4xlarge" : "ami-1cad5275"
}
#### Check that the environment variables we need all exist
def check_environment_variables_exist(*args):
"""
Check that the environment variables in `*args` all exist. If any
do not, print an error message and exit.
"""
vars_exist = True
for var in *args:
if var not in os.environ:
print "Need to set $%s environment variable" % var
vars_exist = False
if not vars_exist:
print "Exiting"
sys.exit()
check_environment_variables_exist("AWS_HOME", "AWS_KEYPAIR",
"AWS_ACCESS_KEY_ID", "AWS_SECRET_ACCESS_KEY")
def stop():
"""
Terminate the first running EC2 instance we can find. Should be
used with care: if you have multiple EC2 instances running it may
terminate the wrong instance.
"""
instance = get_running_instance()
ec2_conn = EC2Connection(
os.environ["AWS_ACCESS_KEY_ID"], os.environ["AWS_SECRET_ACCESS_KEY"])
ec2_conn.terminate_instances([instance.id ])
def get_running_instance():
"""
Return the first running EC2 instance that can be found.
"""
ec2_conn = EC2Connection(
os.environ["AWS_ACCESS_KEY_ID"], os.environ["AWS_SECRET_ACCESS_KEY"])
reservations = ec2_conn.get_all_instances()
running_instances = [instance for reservation in reservations
for instance in reservation.instances
if instance.update() == u"running"]
return running_instances[0]
def login_cmd():
"""
Find a running EC2 instance and login.
"""
login(get_running_instance())
def login(instance):
"""
ssh to `instance`.
"""
print "SSHing to instance with address %s" % (instance.public_dns_name)
keypair = "%s/%s.pem" % (os.environ["AWS_HOME"], os.environ["AWS_KEYPAIR"])
os.system("ssh -i %s ubuntu@%s" % (keypair, instance.public_dns_name))
def start():
"""
Create an EC2 instance, set it up, and login.
"""
instance = create_ec2_instance("m1.small")
subprocess.call(["fab", "first_deploy"])
login(instance)
def create_ec2_instance(instance_type):
"""
Create an EC2 instance of type ``instance_type``.
"""
try:
ami = AMIS[instance_type]
except:
ami = AMIS["m1.small"]
ec2_conn = EC2Connection(
os.environ["AWS_ACCESS_KEY_ID"], os.environ["AWS_SECRET_ACCESS_KEY"])
image = ec2_conn.get_all_images(image_ids=[ami])[0]
reservation = image.run(
1, 1, os.environ["AWS_KEYPAIR"], instance_type=instance_type)
instance = reservation.instances[0]
# Wait for the instance to come up
while instance.update()== u'pending':
time.sleep(2)
# Give the ssh daemon time to start
time.sleep(120)
return instance
def scp(instances, local_filename, remote_filename=False):
"""
scp ``local_filename`` to ``remote_filename`` on ``instances``.
If ``remote_filename`` is not set or is set to ``False`` then
``remote_filename`` is set to ``local_filename``.
"""
keypair = "%s/%s.pem" % (os.environ["AWS_HOME"], os.environ["AWS_KEYPAIR"])
if not remote_filename:
remote_filename = local_filename
for instance in instances:
os.system("scp -r -i %s %s ubuntu@%s:%s" % (
keypair, local_filename,
instance.public_dns_name, remote_filename))
def ssh(instances, cmd, background=False):
"""
Run ``cmd`` on the command line on ``instances``. Runs in the
background if ``background == True``.
"""
keypair = "%s/%s.pem" % (os.environ["AWS_HOME"], os.environ["AWS_KEYPAIR"])
append = {True: " &", False: ""}[background]
for instance in instances:
remote_cmd = "'nohup %s > foo.out 2> foo.err < /dev/null %s'" % (
cmd, append)
os.system(
"ssh -o BatchMode=yes -i %s ubuntu@%s %s" % (
keypair, instance.public_dns_name, remote_cmd))
if __name__ == "__main__":
arg = sys.argv[1]
if arg == "stop":
stop()
elif arg == "login":
login_cmd()
elif arg == "start":
start()
else:
print "Did not recognize the command line argument"