def gather():
'''Check how the nodes we're responsible for are doing.
To keep the architecture simple, for now the nodes are arranged in a
unidirectional ring. Each node is responsible for watching the node below it,
skipping over any nodes it detects as down or not having monitord running.
'''
lookup = {True: {True:'up -monitord', False:'up -ssh -monitord'},
False:{True:'-ping +ssh', False:'down'}}
data = {}
nodes = neighbours.nodes
print 'Pinging downstream nodes:'
count=0
for node in nodes:
count+=1
if count>conf.MAX_WATCH_NODES: break
up = ping.ping(node)
ssh = ping.has_ssh(node)
mond = ping.has_monitord(node)
# if it's got monitord, it can handle things further down the list
if mond:
break
# otherwise, we need to keep the server informed and keep scanning
state=lookup[up][ssh]
# don't bother telling the server things it knows
if node in cache:
if cache[node]==state: continue
# do tell it new stuff, but cache it for later
cache[node] = data[node] = state
print '\tnode',node,'is',state
return data
def deploy_single(hostname, password, command, src_file,
dst_file='/home/usf_ubcslice5/',
username='******',
keyfile='id_rsa'
):
'Single-node deployment.'
# test for SSH
if not ping.has_ssh(hostname, timeout=7.5):
print 'Node doesn''t have port 22 open. No SSH?'
return (False,"no ssh")
# upload
if src_file:
#print 'Uploading...'
ok = ssh.upload(src_file, dst_file, password, username, keyfile,
hostname)
if ok:
#print '[PASS]'
pass
else:
#print '[FAIL]'
#print 'Moving on to the next node!'
return (False,"upload fail")
# run command
#print 'Executing Command...',
ok = ssh.command(command, password, username, keyfile, hostname)
if ok:
#print '[PASS]'
return (True,ok)
else:
#print '[FAIL]'
return (False,"cmd fail")
