-
Notifications
You must be signed in to change notification settings - Fork 23
/
ec2.py
291 lines (233 loc) · 8.9 KB
/
ec2.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
"""
ec2.py
~~~~~~
Simple EC2 cluster management with Python.
Mostly a convenience wrapper around the boto library.
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 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).
Future expansion
~~~~~~~~~~~~~~~~
Future usage:
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.
To export an additiona method:
ec2.boto_object(CLUSTER_NAME, index=0)
Returns the boto object for the instance represented by CLUSTER_NAME
and index.
"""
# Standard library
import cPickle
import os
import shelve
import subprocess
import sys
import time
# Third party libraries
from boto.ec2.connection import EC2Connection
import redis
# 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")
#### Check that the Redis key we need already exists
r = redis.Redis(host='localhost', port=6379, db=0)
if not r.exists("ec2_clusters"):
r.set("ec2_clusters", cPickle.dumps([]))
class Cluster():
def __init__(self, name):
self.name = name
def create(self, n, instance_type):
"""
Create an EC2 cluster with name `self.name`, `n` instances, of
type `instance_type`.
"""
r = redis.Redis(host='localhost', port=6379, db=0)
clusters = cPickle.loads(r.get("ec2_clusters"))
if self.name in clusters:
print "A cluster with name %s already exists. Exiting."
sys.exit()
ec2_conn = EC2Connection(os.environ["AWS_ACCESS_KEY_ID"],
os.environ["AWS_SECRET_ACCESS_KEY"])
try:
ami = AMIS[instance_type]
except:
ami = AMIS["m1.small"]
image = ec2_conn.get_all_images(image_ids=[ami])[0]
reservation = image.run(
n, n, os.environ["AWS_KEYPAIR"], instance_type=instance_type)
instances = reservation.instances
# Wait for the cluster to come up
for instance in instances:
while instance.update()== u'pending':
time.sleep(1)
# Reload, just in case anything has changed
clusters = cPickle.loads(r.get("ec2_clusters"))
instance_descriptions = [instance.public_dns_name for
instance in instances]
clusters.append(
(self.name, instance_descriptions))
r.set("ec2_clusters", cPickle.dumps(clusters))
# Give the ssh daemon time to start
time.sleep(120)
def show(self):
print "Instances in cluster %s" % self.name
cluster = self.cluster_instances()
if cluster == None:
print "No cluster with that name. Exiting."
sys.exit()
for (j, instance_dns) in enumerate(cluster):
print "%s: %s" % (j, instance_dns)
def shutdown(self):
running_instances = get_running_instances()
public_dns_names = [instance.public_dns_name
for instance in running_instances]
for public_dns_name in self.cluster_instances():
if public_dns_name in public_dns_names:
j = public_dns_names.index(public_dns_name)
instance = running_instances[j]
ec2_conn = EC2Connection(
os.environ["AWS_ACCESS_KEY_ID"],
os.environ["AWS_SECRET_ACCESS_KEY"])
ec2_conn.terminate_instances([instance.id ])
r = redis.Redis(host='localhost', port=6379, db=0)
clusters = cPickle.loads(r.get("ec2_clusters"))
clusters = [(name, cluster) for (name, cluster) in clusters
if name != self.name]
r.set("ec2_clusters", cPickle.dumps(clusters))
def cluster_instances(self):
r = redis.Redis(host='localhost', port=6379, db=0)
clusters = cPickle.loads(r.get("ec2_clusters"))
filtered_clusters = [cluster for (name, cluster) in clusters
if name == self.name]
if len(filtered_clusters) == 0:
return None
else:
return filtered_clusters[0]
def show_all():
r = redis.Redis(host='localhost', port=6379, db=0)
clusters = cPickle.loads(r.get("ec2_clusters"))
if len(clusters) == 0:
print "No clusters exist"
else:
print "Showing all clusters"
for (name, cluster) in clusters:
Cluster(name).show()
def shutdown_all():
for name in get_cluster_names():
Cluster(name).shutdown()
def get_cluster_names():
r = redis.Redis(host='localhost', port=6379, db=0)
return [name for (name, cluster) in cPickle.loads(r.get("ec2_clusters"))]
def get_running_instances():
"""
Return all the running EC2 instances.
"""
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
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 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))
#### External interface
if __name__ == "__main__":
args = sys.argv[1:]
cmd = sys.argv[1]
l = len(args)
if cmd=="create" and l==4:
cluster = Cluster(args[1])
cluster.create(int(args[2]), args[3])
elif cmd=="show_all" and l==1:
show_all()
elif cmd=="show" and l==2:
cluster = Cluster(args[1])
cluster.show()
elif cmd=="shutdown" and l==2:
cluster = Cluster(args[1])
cluster.shutdown()
elif cmd=="shutdown_all" and l==3:
shutdown_all()
elif cmd=="ssh" and (l==2 or l==3):
cluster = Cluster(args[1])
cluster.ssh(args[2:])
else:
print self.__doc__()