Add commands to export/import image data from ZK
Change-Id: Id1ac6403f4fe80059b90900c519e56bca7dee0a0
This commit is contained in:
James E. Blair
parent
0310840da1
commit
0b1fa1d57d
@ -202,6 +202,31 @@ alien-image-list
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.. program-output:: nodepool alien-image-list --help
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:nostderr:
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Image builds and uploads can take a lot of time, so there is a pair of
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commands to export and import the image build and upload metadata from
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Nodepool's internal storage in ZooKeeper. These can be used to backup
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and restore data in case the ZooKeeper cluster is lost. Note that
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these commands do not save or restore the actual image data, only the
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records in ZooKeeper. If the data are important, consider backing
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them up as well. Even without the local image builds, restoring the
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image metadata will allow nodepool-launcher to continue to operate
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while new builds are created.
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These commands do not export or import any node information. It is
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expected that any existing nodes will be detected as leaked and
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automatically deleted if the ZooKeeper storage is reset.
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export-image-data
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^^^^^^^^^^^^^^^^^
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.. program-output:: nodepool export-image-data --help
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:nostderr:
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import-image-data
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^^^^^^^^^^^^^^^^^
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.. program-output:: nodepool import-image-data --help
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:nostderr:
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Removing a Provider
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-------------------
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@ -12,7 +12,9 @@
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# License for the specific language governing permissions and limitations
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# under the License.
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import json
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import logging.config
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import os
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from prettytable import PrettyTable
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@ -144,6 +146,24 @@ class NodePoolCmd(NodepoolApp):
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cmd_image_unpause.set_defaults(func=self.image_unpause)
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cmd_image_unpause.add_argument('image', help='image name')
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cmd_export_image_data = subparsers.add_parser(
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'export-image-data',
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help='Export image data from ZooKeeper')
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cmd_export_image_data.add_argument(
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'path',
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type=str,
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help='Export file path')
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cmd_export_image_data.set_defaults(func=self.export_image_data)
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cmd_import_image_data = subparsers.add_parser(
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'import-image-data',
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help='Import image data to ZooKeeper')
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cmd_import_image_data.add_argument(
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'path',
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type=str,
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help='Import file path')
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cmd_import_image_data.set_defaults(func=self.import_image_data)
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return parser
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def setup_logging(self):
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@ -368,6 +388,16 @@ class NodePoolCmd(NodepoolApp):
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image_name = self.args.image
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self.zk.setImagePaused(image_name, False)
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def export_image_data(self):
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data = self.zk.exportImageData()
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with open(os.open(self.args.path,
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os.O_CREAT | os.O_WRONLY, 0o600), 'w') as f:
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json.dump(data, f)
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def import_image_data(self):
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with open(self.args.path, 'r') as f:
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self.zk.importImageData(json.load(f))
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def _wait_for_threads(self, threads):
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for t in threads:
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if t:
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@ -393,7 +423,8 @@ class NodePoolCmd(NodepoolApp):
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'image-delete', 'alien-image-list',
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'list', 'delete',
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'request-list', 'info', 'erase',
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'image-pause', 'image-unpause'):
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'image-pause', 'image-unpause',
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'export-image-data', 'import-image-data'):
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self.zk = zk.ZooKeeper(enable_cache=False)
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self.zk.connect(
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list(config.zookeeper_servers.values()),
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@ -655,6 +655,17 @@ class DBTestCase(BaseTestCase):
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for child in self.zk.client.get_children(node):
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self.printZKTree(join(node, child))
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def getZKTree(self, path, ret=None):
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"""Return the contents of a ZK tree as a dictionary"""
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if ret is None:
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ret = {}
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for key in self.zk.client.get_children(path):
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subpath = os.path.join(path, key)
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ret[subpath] = self.zk.client.get(
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os.path.join(path, key))[0]
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self.getZKTree(subpath, ret)
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return ret
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class IntegrationTestCase(DBTestCase):
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def setUpFakes(self):
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@ -16,6 +16,7 @@
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import logging
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import os.path
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import sys # noqa making sure its available for monkey patching
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import tempfile
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import fixtures
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import mock
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@ -399,3 +400,37 @@ class TestNodepoolCMD(tests.DBTestCase):
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nodes = self.waitForNodes('fake-label')
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self.assertEqual(1, len(nodes))
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self.assertEqual(p1_nodes[0], nodes[0])
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def test_export_image_data(self):
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configfile = self.setup_config('node.yaml')
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builder = self.useBuilder(configfile)
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pool = self.useNodepool(configfile, watermark_sleep=1)
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pool.start()
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self.waitForImage('fake-provider', 'fake-image')
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self.waitForNodes('fake-label')
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pool.stop()
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for worker in builder._upload_workers:
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worker.shutdown()
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worker.join()
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builder.stop()
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# Save a copy of the data in ZK
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old_data = self.getZKTree('/nodepool/images')
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# We aren't backing up the lock data
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old_data.pop('/nodepool/images/fake-image/builds/0000000001'
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'/providers/fake-provider/images/lock')
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old_data.pop('/nodepool/images/fake-image/builds/lock')
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with tempfile.NamedTemporaryFile() as tf:
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self.patch_argv(
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"-c", configfile, 'export-image-data', tf.name)
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nodepoolcmd.main()
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# Delete data from ZK
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self.zk.client.delete('/nodepool', recursive=True)
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self.patch_argv(
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"-c", configfile, 'import-image-data', tf.name)
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nodepoolcmd.main()
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new_data = self.getZKTree('/nodepool/images')
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self.assertEqual(new_data, old_data)
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@ -2479,3 +2479,46 @@ class ZooKeeper(object):
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def getStatsElection(self, identifier):
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path = self._electionPath('stats')
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return Election(self.client, path, identifier)
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def exportImageData(self):
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'''
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Export the DIB image and upload data from ZK for backup purposes.
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'''
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ret = {}
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for image_name in self.getImageNames():
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paused = self.getImagePaused(image_name)
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if paused:
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paused_path = self._imagePausePath(image_name)
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ret[paused_path] = ''
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for build_no in self.getBuildNumbers(image_name):
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build_path = self._imageBuildsPath(image_name) + "/" + build_no
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try:
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build_data, stat = self.client.get(build_path)
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except kze.NoNodeError:
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continue
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ret[build_path] = build_data.decode('utf8')
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for provider_name in self.getBuildProviders(image_name,
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build_no):
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for upload_no in self.getImageUploadNumbers(
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image_name, build_no, provider_name):
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upload_path = self._imageUploadPath(
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image_name, build_no, provider_name) + "/"
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upload_path += upload_no
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try:
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upload_data, stat = self.client.get(upload_path)
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except kze.NoNodeError:
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continue
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ret[upload_path] = upload_data.decode('utf8')
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return ret
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def importImageData(self, import_data):
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'''Import the DIB image and upload data to ZK.
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This makes no guarantees about locking; it is expected to be
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run on a quiescent system with no daemons running.
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'''
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for path, data in import_data.items():
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self.client.create(path,
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value=data.encode('utf8'),
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makepath=True)
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@ -0,0 +1,6 @@
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---
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features:
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- |
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Two new nodepool commands, `nodepool export-image-data` and
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`nodepool import-image-data` have been added to back up the image
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data in ZooKeeper to a file in case the ZooKeeper cluster is lost.
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