72f8cfa715
So, here is the start for Guest Agent support. Savanna communicates with the agent via oslo.messaging. The agent's code will be committed later in a separate repository. One remark: current code assumes that the agent is not pre-installed on the image, so additional userdata is added. The userdata installs and starts the agent. Current limitations: * Works for Vanilla and HDP plugins * Works on Ubuntu and CentOS guests * Works with Rabbit MQ only Note: the guest agent repo is at https://github.com/stackforge/savanna-guestagent Correspondingly the project name in gerrit is stackforge/savanna-guestagent Implements: blueprint guest-agent Change-Id: I787b6b058989568553815bc6569e6fe8f46df6b5
125 lines
3.8 KiB
Python
125 lines
3.8 KiB
Python
# Copyright (c) 2013 Mirantis Inc.
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# Copyright (c) 2013 Hortonworks, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import abc
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from oslo.config import cfg
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import six
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# These options are for SSH remote only
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ssh_opts = [
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cfg.IntOpt('global_remote_threshold', default=100,
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help='Maximum number of remote operations that will '
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'be running at the same time. Note that each '
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'remote operation requires its own process to '
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'run.'),
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cfg.IntOpt('cluster_remote_threshold', default=70,
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help='The same as global_remote_threshold, but for '
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'a single cluster.'),
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]
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# These options are for Agent remote only
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agent_opts = [
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cfg.StrOpt('rpc_server_host',
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help='A server to which guest agent running on a VM '
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'should connect to. The parameter is needed only if '
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'agent remote is enabled.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(ssh_opts)
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CONF.register_opts(agent_opts)
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DRIVER = None
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@six.add_metaclass(abc.ABCMeta)
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class RemoteDriver(object):
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@abc.abstractmethod
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def setup_remote(self, engine):
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"""Performs driver initialization."""
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@abc.abstractmethod
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def get_remote(self, instance):
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"""Returns driver specific Remote."""
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@abc.abstractmethod
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def get_userdata_template(self):
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"""Returns userdata template preparing instance to work with driver."""
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@six.add_metaclass(abc.ABCMeta)
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class Remote(object):
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@abc.abstractmethod
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def get_neutron_info(self):
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"""Returns dict which later could be passed to get_http_client."""
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@abc.abstractmethod
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def get_http_client(self, port, info=None):
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"""Returns HTTP client for a given instance's port."""
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@abc.abstractmethod
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def close_http_sessions(self):
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"""Closes all cached HTTP sessions."""
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@abc.abstractmethod
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def execute_command(self, cmd, run_as_root=False, get_stderr=False,
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raise_when_error=True, timeout=300):
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"""Execute specified command remotely using existing ssh connection.
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Return exit code, stdout data and stderr data of the executed command.
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"""
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@abc.abstractmethod
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def write_file_to(self, remote_file, data, run_as_root=False, timeout=120):
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"""Create remote file using existing ssh connection and write the given
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data to it.
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"""
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@abc.abstractmethod
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def write_files_to(self, files, run_as_root=False, timeout=120):
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"""Copy file->data dictionary in a single ssh connection.
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"""
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@abc.abstractmethod
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def read_file_from(self, remote_file, run_as_root=False, timeout=120):
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"""Read remote file from the specified host and return given data."""
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@abc.abstractmethod
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def replace_remote_string(self, remote_file, old_str, new_str,
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timeout=120):
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"""Replaces strings in remote file using sed command."""
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def setup_remote(driver, engine):
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global DRIVER
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DRIVER = driver
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DRIVER.setup_remote(engine)
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def get_remote(instance):
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"""Returns Remote for a given instance."""
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return DRIVER.get_remote(instance)
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def get_userdata_template():
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"""Returns userdata template as a string."""
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return DRIVER.get_userdata_template()
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