2 # NodeManager plugin - first step of handling omf_controlled slices
6 Overwrites the 'resctl' tag of slivers controlled by OMF so slivermanager.py does the right thing
16 # we need this to run after sliverauth
22 ### the new template for OMF v6
23 # hard-wire this for now
24 # once the variables are expanded, this is expected to go into
25 config_ple_template="""---
26 # we extract expires time here, even in a comment so that the
27 # trigger script gets called whenever this changes
30 # these are not actual OMF parameters, they are only used by the trigger script
32 :slicename: _slicename_
35 :uid: _slicename_%_hostname_
36 :uri: xmpp://_slicename_-_hostname_-<%= "#{Process.pid}" %>:_slicename_-_hostname_-<%= "#{Process.pid}" %>@_xmpp_server_
37 :environment: production
41 :root_cert_dir: /home/_slicename_/root_certs
42 :entity_cert: /home/_slicename_/entity.crt
43 :entity_key: /home/_slicename_/.ssh/id_rsa
46 # the path where the config is expected from within the sliver
47 yaml_slice_path="/etc/omf_rc/config.yml"
48 # the path for the script that we call when a change occurs
49 # given that we're now responsible for fetching this one, I have to
50 # decide on an actual path - not jsut a name to search for in PATH
51 omf_rc_trigger_script="/usr/bin/plc_trigger_omf_rc"
52 omf_rc_trigger_log="/var/log/plc_trigger_omf_rc.log"
54 # hopefully temporary: when trigger script is missing, fetch it at the url here
55 omf_rc_trigger_url="http://git.mytestbed.net/?p=omf.git;a=blob_plain;f=omf_rc/bin/plc_trigger_omf_rc;hb=HEAD"
56 def fetch_trigger_script_if_missing (slicename):
57 full_path="/vservers/%s/%s"%(slicename, omf_rc_trigger_script)
58 if not os.path.isfile (full_path):
59 retcod=subprocess.call (['curl', '--silent', '-o', full_path, omf_rc_trigger_url])
61 logger.log("Could not fetch %s"%omf_rc_trigger_url)
63 subprocess.call(['chmod', '+x', full_path])
64 logger.log("omf_resctl: fetched %s"%(full_path))
65 logger.log("omf_resctl: from %s"%(omf_rc_trigger_url))
67 def GetSlivers(data, conf = None, plc = None):
68 logger.log("omf_resctl.GetSlivers")
69 if 'accounts' not in data:
70 logger.log_missing_data("omf_resctl.GetSlivers", 'accounts')
74 xmpp_server=data['xmpp']['server']
76 # we have the key but no value, just as bad
79 # disabled feature - bailing out
80 logger.log("omf_resctl: PLC_OMF config unsufficient (not enabled, or no server set), -- plugin exiting")
83 hostname = data['hostname']
85 def is_omf_friendly (sliver):
86 for chunk in sliver['attributes']:
87 if chunk['tagname']=='omf_control': return True
89 for sliver in data['slivers']:
90 # skip non OMF-friendly slices
91 if not is_omf_friendly (sliver): continue
92 slicename=sliver['name']
93 expires=str(sliver['expires'])
94 yaml_template = config_ple_template
95 yaml_contents = yaml_template\
96 .replace('_xmpp_server_', xmpp_server)\
97 .replace('_slicename_', slicename)\
98 .replace('_hostname_', hostname)\
99 .replace('_expires_', expires)
100 yaml_full_path="/vservers/%s/%s"%(slicename, yaml_slice_path)
101 yaml_full_dir=os.path.dirname(yaml_full_path)
102 if not os.path.isdir(yaml_full_dir):
103 try: os.makedirs(yaml_full_dir)
106 config_changes=tools.replace_file_with_string(yaml_full_path, yaml_contents)
107 logger.log("yaml_contents length=%d, config_changes=%r"%(len(yaml_contents), config_changes))
108 # would make sense to also check for changes to authorized_keys
109 # would require saving a copy of that some place for comparison
112 if config_changes or keys_changes:
113 # instead of restarting the service we call a companion script
115 fetch_trigger_script_if_missing (slicename)
116 # the trigger script actually needs to be run in the slice context of course
117 # in addition there is a requirement to pretend we run as a login shell
119 slice_command = [ "sudo", "-i", omf_rc_trigger_script ]
120 to_run = tools.command_in_slice (slicename, slice_command)
121 log_filename = "/vservers/%s/%s"%(slicename, omf_rc_trigger_log)
122 logger.log("omf_resctl: starting %s"%to_run)
123 logger.log("redirected into %s"%log_filename)
124 logger.log("*not* waiting for completion..")
125 with open(log_filename, "a") as log_file:
126 subprocess.Popen(to_run, stdout=log_file, stderr=subprocess.STDOUT)
127 # a first version tried to 'communicate' on that subprocess instance
128 # but that tended to create deadlocks in some cases
129 # causing nodemanager to stall...
130 # we're only losing the child's retcod, no big deal
133 traceback.print_exc()
134 logger.log_exc("omf_resctl: WARNING: Could not call trigger script %s"%\
135 omf_rc_trigger_script, name=slicename)
137 logger.log("omf_resctl: %s: omf_control'ed sliver has no change" % slicename)