mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-26 16:20:28 +00:00
333 lines
12 KiB
Python
333 lines
12 KiB
Python
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#!/usr/bin/env python
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# Copyright 2017 The Kubernetes Authors.
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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 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 os
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import rados
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import getopt
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import sys
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import json
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"""
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CEPH_CLUSTER_NAME=test CEPH_MON=172.24.0.4 CEPH_AUTH_ID=admin CEPH_AUTH_KEY=AQCMpH9YM4Q1BhAAXGNQyyOne8ZsXqWGon/dIQ== cephfs_provisioner.py -n foo -u bar
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"""
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try:
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import ceph_volume_client
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ceph_module_found = True
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except ImportError as e:
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ceph_volume_client = None
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ceph_module_found = False
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VOlUME_GROUP="kubernetes"
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CONF_PATH="/etc/ceph/"
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class CephFSNativeDriver(object):
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"""Driver for the Ceph Filesystem.
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This driver is 'native' in the sense that it exposes a CephFS filesystem
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for use directly by guests, with no intermediate layer like NFS.
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"""
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def __init__(self, *args, **kwargs):
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self._volume_client = None
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def _create_conf(self, cluster_name, mons):
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""" Create conf using monitors
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Create a minimal ceph conf with monitors and cephx
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"""
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conf_path = CONF_PATH + cluster_name + ".conf"
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if not os.path.isfile(conf_path) or os.access(conf_path, os.W_OK):
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conf = open(conf_path, 'w')
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conf.write("[global]\n")
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conf.write("mon_host = " + mons + "\n")
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conf.write("auth_cluster_required = cephx\nauth_service_required = cephx\nauth_client_required = cephx\n")
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conf.close()
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return conf_path
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def _create_keyring(self, cluster_name, id, key):
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""" Create client keyring using id and key
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"""
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keyring_path = CONF_PATH + cluster_name + "." + "client." + id + ".keyring"
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if not os.path.isfile(keyring_path) or os.access(keyring_path, os.W_OK):
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keyring = open(keyring_path, 'w')
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keyring.write("[client." + id + "]\n")
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keyring.write("key = " + key + "\n")
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keyring.write("caps mds = \"allow *\"\n")
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keyring.write("caps mon = \"allow *\"\n")
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keyring.write("caps osd = \"allow *\"\n")
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keyring.close()
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@property
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def volume_client(self):
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if self._volume_client:
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return self._volume_client
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if not ceph_module_found:
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raise ValueError("Ceph client libraries not found.")
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try:
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cluster_name = os.environ["CEPH_CLUSTER_NAME"]
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except KeyError:
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cluster_name = "ceph"
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try:
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mons = os.environ["CEPH_MON"]
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except KeyError:
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raise ValueError("Missing CEPH_MON env")
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try:
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auth_id = os.environ["CEPH_AUTH_ID"]
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except KeyError:
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raise ValueError("Missing CEPH_AUTH_ID")
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try:
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auth_key = os.environ["CEPH_AUTH_KEY"]
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except:
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raise ValueError("Missing CEPH_AUTH_KEY")
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conf_path = self._create_conf(cluster_name, mons)
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self._create_keyring(cluster_name, auth_id, auth_key)
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self._volume_client = ceph_volume_client.CephFSVolumeClient(
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auth_id, conf_path, cluster_name)
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try:
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self._volume_client.connect(None)
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except Exception:
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self._volume_client = None
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raise
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return self._volume_client
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def _authorize_ceph(self, volume_path, auth_id, readonly):
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path = self._volume_client._get_path(volume_path)
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# First I need to work out what the data pool is for this share:
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# read the layout
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pool_name = self._volume_client._get_ancestor_xattr(path, "ceph.dir.layout.pool")
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namespace = self._volume_client.fs.getxattr(path, "ceph.dir.layout.pool_namespace")
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# Now construct auth capabilities that give the guest just enough
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# permissions to access the share
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client_entity = "client.{0}".format(auth_id)
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want_access_level = 'r' if readonly else 'rw'
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want_mds_cap = 'allow r,allow {0} path={1}'.format(want_access_level, path)
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want_osd_cap = 'allow {0} pool={1} namespace={2}'.format(
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want_access_level, pool_name, namespace)
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try:
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existing = self._volume_client._rados_command(
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'auth get',
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{
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'entity': client_entity
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}
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)
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# FIXME: rados raising Error instead of ObjectNotFound in auth get failure
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except rados.Error:
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caps = self._volume_client._rados_command(
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'auth get-or-create',
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{
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'entity': client_entity,
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'caps': [
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'mds', want_mds_cap,
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'osd', want_osd_cap,
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'mon', 'allow r']
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})
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else:
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# entity exists, update it
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cap = existing[0]
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# Construct auth caps that if present might conflict with the desired
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# auth caps.
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unwanted_access_level = 'r' if want_access_level is 'rw' else 'rw'
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unwanted_mds_cap = 'allow {0} path={1}'.format(unwanted_access_level, path)
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unwanted_osd_cap = 'allow {0} pool={1} namespace={2}'.format(
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unwanted_access_level, pool_name, namespace)
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def cap_update(orig, want, unwanted):
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# Updates the existing auth caps such that there is a single
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# occurrence of wanted auth caps and no occurrence of
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# conflicting auth caps.
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cap_tokens = set(orig.split(","))
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cap_tokens.discard(unwanted)
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cap_tokens.add(want)
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return ",".join(cap_tokens)
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osd_cap_str = cap_update(cap['caps'].get('osd', ""), want_osd_cap, unwanted_osd_cap)
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mds_cap_str = cap_update(cap['caps'].get('mds', ""), want_mds_cap, unwanted_mds_cap)
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caps = self._volume_client._rados_command(
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'auth caps',
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{
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'entity': client_entity,
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'caps': [
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'mds', mds_cap_str,
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'osd', osd_cap_str,
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'mon', cap['caps'].get('mon')]
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})
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caps = self._volume_client._rados_command(
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'auth get',
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{
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'entity': client_entity
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}
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)
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# Result expected like this:
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# [
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# {
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# "entity": "client.foobar",
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# "key": "AQBY0\/pViX\/wBBAAUpPs9swy7rey1qPhzmDVGQ==",
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# "caps": {
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# "mds": "allow *",
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# "mon": "allow *"
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# }
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# }
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# ]
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assert len(caps) == 1
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assert caps[0]['entity'] == client_entity
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return caps[0]
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def create_share(self, path, user_id, size=None):
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"""Create a CephFS volume.
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"""
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volume_path = ceph_volume_client.VolumePath(VOlUME_GROUP, path)
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# Create the CephFS volume
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volume = self.volume_client.create_volume(volume_path, size=size)
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# To mount this you need to know the mon IPs and the path to the volume
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mon_addrs = self.volume_client.get_mon_addrs()
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export_location = "{addrs}:{path}".format(
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addrs=",".join(mon_addrs),
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path=volume['mount_path'])
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"""TODO
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restrict to user_id
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"""
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auth_result = self._authorize_ceph(volume_path, user_id, False)
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ret = {
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'path': volume['mount_path'],
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'user': auth_result['entity'],
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'key': auth_result['key']
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}
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self._create_keyring(self.volume_client.cluster_name, user_id, auth_result['key'])
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return json.dumps(ret)
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def _deauthorize(self, volume_path, auth_id):
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"""
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The volume must still exist.
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NOTE: In our `_authorize_ceph` method we give user extra mds `allow r`
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cap to work around a kernel cephfs issue. So we need a customized
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`_deauthorize` method to remove caps instead of using
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`volume_client._deauthorize`.
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This methid is modified from
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https://github.com/ceph/ceph/blob/v13.0.0/src/pybind/ceph_volume_client.py#L1181.
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"""
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client_entity = "client.{0}".format(auth_id)
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path = self.volume_client._get_path(volume_path)
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path = self.volume_client._get_path(volume_path)
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pool_name = self.volume_client._get_ancestor_xattr(path, "ceph.dir.layout.pool")
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namespace = self.volume_client.fs.getxattr(path, "ceph.dir.layout.pool_namespace")
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# The auth_id might have read-only or read-write mount access for the
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# volume path.
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access_levels = ('r', 'rw')
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want_mds_caps = {'allow {0} path={1}'.format(access_level, path)
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for access_level in access_levels}
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want_osd_caps = {'allow {0} pool={1} namespace={2}'.format(
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access_level, pool_name, namespace)
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for access_level in access_levels}
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try:
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existing = self.volume_client._rados_command(
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'auth get',
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{
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'entity': client_entity
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}
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)
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def cap_remove(orig, want):
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cap_tokens = set(orig.split(","))
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return ",".join(cap_tokens.difference(want))
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cap = existing[0]
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osd_cap_str = cap_remove(cap['caps'].get('osd', ""), want_osd_caps)
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mds_cap_str = cap_remove(cap['caps'].get('mds', ""), want_mds_caps)
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if (not osd_cap_str) and (not osd_cap_str or mds_cap_str == "allow r"):
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# If osd caps are removed and mds caps are removed or only have "allow r", we can remove entity safely.
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self.volume_client._rados_command('auth del', {'entity': client_entity}, decode=False)
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else:
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self.volume_client._rados_command(
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'auth caps',
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{
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'entity': client_entity,
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'caps': [
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'mds', mds_cap_str,
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'osd', osd_cap_str,
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'mon', cap['caps'].get('mon', 'allow r')]
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})
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# FIXME: rados raising Error instead of ObjectNotFound in auth get failure
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except rados.Error:
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# Already gone, great.
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return
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def delete_share(self, path, user_id):
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volume_path = ceph_volume_client.VolumePath(VOlUME_GROUP, path)
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self._deauthorize(volume_path, user_id)
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self.volume_client.delete_volume(volume_path)
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self.volume_client.purge_volume(volume_path)
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def __del__(self):
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if self._volume_client:
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self._volume_client.disconnect()
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self._volume_client = None
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def main():
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create = True
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share = ""
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user = ""
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cephfs = CephFSNativeDriver()
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try:
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opts, args = getopt.getopt(sys.argv[1:], "rn:u:", ["remove"])
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except getopt.GetoptError:
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print "Usage: " + sys.argv[0] + " --remove -n share_name -u ceph_user_id"
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sys.exit(1)
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for opt, arg in opts:
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if opt == '-n':
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share = arg
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elif opt == '-u':
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user = arg
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elif opt in ("-r", "--remove"):
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create = False
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if share == "" or user == "":
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print "Usage: " + sys.argv[0] + " --remove -n share_name -u ceph_user_id"
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sys.exit(1)
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if create == True:
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print cephfs.create_share(share, user)
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else:
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cephfs.delete_share(share, user)
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if __name__ == "__main__":
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main()
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