coren has uploaded a new change for review.
https://gerrit.wikimedia.org/r/227462
Change subject: Add manage-snapshots script
......................................................................
Add manage-snapshots script
This script cleans up snapshots in the specified volume
group <vg> by discarding:
(a) snapshots that are over 80% full; and
(b) enough snapshots, oldest first, so that there
is at least <space> terabytes of allocatable space
in the volume group.
Bug: T106474
Change-Id: I098a9081b5c629a5fddcc268a1f6b98fcd08509f
---
A modules/labstore/files/manage-snapshots
1 file changed, 102 insertions(+), 0 deletions(-)
git pull ssh://gerrit.wikimedia.org:29418/operations/puppet
refs/changes/62/227462/1
diff --git a/modules/labstore/files/manage-snapshots
b/modules/labstore/files/manage-snapshots
new file mode 100755
index 0000000..4f91f9c
--- /dev/null
+++ b/modules/labstore/files/manage-snapshots
@@ -0,0 +1,102 @@
+#! /usr/bin/python3
+# -*- coding: utf-8 -*-
+#
+# Copyright © 2015 Marc-André Pelletier <[email protected]>
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+#
+#
+# THIS FILE IS MANAGED BY PUPPET
+#
+# Source: modules/labstore/manage-snapshots
+# From: modules/labstore/manifests/fileserve.rpp
+#
+
+"""
+manage-snapshots
+
+usage: manage-snapshots <vg> <space>
+
+This script cleans up snapshots in the specified volume
+group <vg> by discarding:
+
+(a) snapshots that are over 80% full; and
+(b) enough snapshots, oldest first, so that there
+ is at least <space> terabytes of allocatable space
+ in the volume group.
+
+The script will cowardly refuse to touch any mounted
+snapshot.
+"""
+
+import argparse
+import subprocess
+import logging
+import re
+
+def parsed_run(*cmd):
+ entries = []
+ for entry in subprocess.check_output(list(cmd)).decode().splitlines():
+ entries.append(list(col.strip() for col in entry.split(':')))
+ return entries
+
+def terabytes(num):
+ match = re.match(r'^([0-9.]+)t$', num)
+ if match:
+ return float(match.group(1))
+ raise ValueError('Unexpected non-size value "%s"' % num)
+
+def discard(name):
+ if subprocess.call(['/sbin/lvremove', '-f', name]) == 0:
+ return True
+ return False
+
+parser = argparse.ArgumentParser()
+parser.add_argument('vg', help='Volume group to clean snapshots from')
+parser.add_argument('space', help='Free space to leave in the volume group (in
terabytes)')
+args = parser.parse_args()
+
+logging.basicConfig(level=logging.INFO, format='%(message)s')
+
+free = None
+for vg in parsed_run('/sbin/vgs', '--separator', ':', '--options',
'name,size,free', '--units', 't'):
+ if vg[0] == args.vg:
+ free = terabytes(vg[2])
+if not free:
+ raise ValueError('%s is not a volume group' % args.vg)
+
+snapshots = {}
+for lv in parsed_run('/sbin/lvs', '--separator', ':', '--options',
'vg_name,name,origin,size,snap_percent', '--units', 't'):
+ if lv[0] == args.vg:
+ match = re.match(r'^(.*?)([0-9]+)$', lv[1])
+ if match and match.group(1) == lv[2]:
+ snapshots["%s/%s" % (lv[0], lv[1])] = (lv[3], lv[4],
match.group(2))
+
+# sort by timestamp (lexicographically, which works out)
+oldest = sorted(snapshots.items(), key=lambda x: x[1][2])
+
+overfull = []
+for lv, entry in snapshots.items():
+ if float(entry[1]) > 80.0:
+ overfull.append(lv)
+ if discard(lv):
+ free += terabytes(entry[0])
+
+while free < float(args.space):
+ if len(oldest) < 1:
+ break
+ if not oldest[0][0] in overfull:
+ if discard(oldest[0][0]):
+ free += terabytes(oldest[0][1][0])
+ oldest.pop(0)
+
--
To view, visit https://gerrit.wikimedia.org/r/227462
To unsubscribe, visit https://gerrit.wikimedia.org/r/settings
Gerrit-MessageType: newchange
Gerrit-Change-Id: I098a9081b5c629a5fddcc268a1f6b98fcd08509f
Gerrit-PatchSet: 1
Gerrit-Project: operations/puppet
Gerrit-Branch: production
Gerrit-Owner: coren <[email protected]>
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