Source code for scheduler.swarm

import re
import time

from django.conf import settings
from docker import Client

from . import AbstractSchedulerClient
from .states import JobState

MATCH = re.compile(

[docs]class SwarmClient(AbstractSchedulerClient): def __init__(self, target, auth, options, pkey): super(SchedulerClient, self).__init__(target, auth, options, pkey) = settings.SWARM_HOST # single global connection self.registry = settings.REGISTRY_HOST + ':' + settings.REGISTRY_PORT self.docker_cli = Client("tcp://{}:2395".format(, timeout=1200, version='1.17')
[docs] def create(self, name, image, command='', template=None, **kwargs): """Create a new container.""" cimage = self.registry + '/' + image affinity = "affinity:container!=~/{}*/".format(re.split(r'_v\d.', name)[0]) l = locals().copy() l.update(re.match(MATCH, name).groupdict()) mem = kwargs.get('memory', {}).get(l['c_type']) if mem: mem = mem.lower() if mem[-2:-1].isalpha() and mem[-1].isalpha(): mem = mem[:-1] cpu = kwargs.get('cpu', {}).get(l['c_type']) self.docker_cli.create_container(image=cimage, name=name, command=command.encode('utf-8'), mem_limit=mem, cpu_shares=cpu, environment=[affinity], host_config={'PublishAllPorts': True})
[docs] def start(self, name): """Start a container.""" self.docker_cli.start(name)
[docs] def stop(self, name): """Stop a container.""" self.docker_cli.stop(name)
[docs] def destroy(self, name): """Destroy a container.""" self.stop(name) self.docker_cli.remove_container(name)
[docs] def run(self, name, image, entrypoint, command): """Run a one-off command.""" cimage = self.registry + '/' + image # use affinity for nodes that already have the image affinity = "affinity:image==~{}".format(cimage) self.docker_cli.create_container(image=cimage, name=name, command=command.encode('utf-8'), environment=[affinity], entrypoint=[entrypoint]) time.sleep(2) self.start(name) rc = 0 while (True): if self._get_container_state(name) == JobState.created: break time.sleep(1) try: output = self.docker_cli.logs(name) return rc, output except: rc = 1 return rc, output
def _get_container_state(self, name): try: if self.docker_cli.inspect_container(name)['State']['Running']: return JobState.up else: return JobState.created except: return JobState.destroyed
[docs] def state(self, name): """Display the given job's running state.""" try: for _ in xrange(30): return self._get_container_state(name) time.sleep(1) # FIXME (smothiki): should be able to send JobState.crashed except KeyError: return JobState.error except RuntimeError: return JobState.destroyed
def _get_hostname(self, application_name): hostname = settings.UNIT_HOSTNAME if hostname == 'default': return '' elif hostname == 'application': # replace underscore with dots, since underscore is not valid in DNS hostnames dns_name = application_name.replace('_', '.') return dns_name elif hostname == 'server': raise NotImplementedError else: raise RuntimeError('Unsupported hostname: ' + hostname) def _get_portbindings(self, image): dictports = self.docker_cli.inspect_image(image)['ContainerConfig']['ExposedPorts'] for port in dictports: dictports[port] = None return dictports def _get_ports(self, image): dictports = self.docker_cli.inspect_image(image)['ContainerConfig']['ExposedPorts'] return [int(port.split('/')[0]) for port in dictports]
SchedulerClient = SwarmClient