292 lines
7.5 KiB
Python
292 lines
7.5 KiB
Python
#
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# Copyright 2012 Canonical Ltd.
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#
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# This file is sourced from lp:openstack-charm-helpers
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#
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# Authors:
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# James Page <james.page@ubuntu.com>
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# Adam Gandelman <adamg@ubuntu.com>
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#
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import commands
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import os
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import shutil
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import time
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from subprocess import (
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check_call,
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check_output,
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CalledProcessError
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)
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from charmhelpers.core.hookenv import (
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relation_get,
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relation_ids,
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related_units,
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log,
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INFO,
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ERROR
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)
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from charmhelpers.core.host import (
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apt_install,
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mount,
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mounts,
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service_start,
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service_stop,
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umount,
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)
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KEYRING = '/etc/ceph/ceph.client.%s.keyring'
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KEYFILE = '/etc/ceph/ceph.client.%s.key'
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CEPH_CONF = """[global]
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auth supported = %(auth)s
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keyring = %(keyring)s
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mon host = %(mon_hosts)s
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"""
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def running(service):
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# this local util can be dropped as soon the following branch lands
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# in lp:charm-helpers
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# https://code.launchpad.net/~gandelman-a/charm-helpers/service_running/
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try:
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output = check_output(['service', service, 'status'])
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except CalledProcessError:
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return False
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else:
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if ("start/running" in output or "is running" in output):
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return True
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else:
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return False
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def install():
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ceph_dir = "/etc/ceph"
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if not os.path.isdir(ceph_dir):
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os.mkdir(ceph_dir)
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apt_install('ceph-common', fatal=True)
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def rbd_exists(service, pool, rbd_img):
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(rc, out) = commands.getstatusoutput('rbd list --id %s --pool %s' %
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(service, pool))
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return rbd_img in out
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def create_rbd_image(service, pool, image, sizemb):
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cmd = [
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'rbd',
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'create',
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image,
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'--size',
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str(sizemb),
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'--id',
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service,
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'--pool',
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pool
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]
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check_call(cmd)
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def pool_exists(service, name):
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(rc, out) = commands.getstatusoutput("rados --id %s lspools" % service)
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return name in out
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def create_pool(service, name):
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cmd = [
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'rados',
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'--id',
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service,
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'mkpool',
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name
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]
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check_call(cmd)
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def keyfile_path(service):
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return KEYFILE % service
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def keyring_path(service):
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return KEYRING % service
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def create_keyring(service, key):
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keyring = keyring_path(service)
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if os.path.exists(keyring):
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log('ceph: Keyring exists at %s.' % keyring, level=INFO)
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cmd = [
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'ceph-authtool',
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keyring,
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'--create-keyring',
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'--name=client.%s' % service,
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'--add-key=%s' % key
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]
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check_call(cmd)
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log('ceph: Created new ring at %s.' % keyring, level=INFO)
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def create_key_file(service, key):
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# create a file containing the key
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keyfile = keyfile_path(service)
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if os.path.exists(keyfile):
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log('ceph: Keyfile exists at %s.' % keyfile, level=INFO)
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fd = open(keyfile, 'w')
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fd.write(key)
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fd.close()
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log('ceph: Created new keyfile at %s.' % keyfile, level=INFO)
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def get_ceph_nodes():
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hosts = []
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for r_id in relation_ids('ceph'):
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for unit in related_units(r_id):
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hosts.append(relation_get('private-address', unit=unit, rid=r_id))
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return hosts
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def configure(service, key, auth):
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create_keyring(service, key)
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create_key_file(service, key)
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hosts = get_ceph_nodes()
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mon_hosts = ",".join(map(str, hosts))
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keyring = keyring_path(service)
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with open('/etc/ceph/ceph.conf', 'w') as ceph_conf:
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ceph_conf.write(CEPH_CONF % locals())
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modprobe_kernel_module('rbd')
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def image_mapped(image_name):
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(rc, out) = commands.getstatusoutput('rbd showmapped')
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return image_name in out
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def map_block_storage(service, pool, image):
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cmd = [
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'rbd',
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'map',
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'%s/%s' % (pool, image),
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'--user',
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service,
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'--secret',
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keyfile_path(service),
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]
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check_call(cmd)
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def filesystem_mounted(fs):
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return fs in [f for m, f in mounts()]
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def make_filesystem(blk_device, fstype='ext4', timeout=10):
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count = 0
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e_noent = os.errno.ENOENT
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while not os.path.exists(blk_device):
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if count >= timeout:
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log('ceph: gave up waiting on block device %s' % blk_device,
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level=ERROR)
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raise IOError(e_noent, os.strerror(e_noent), blk_device)
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log('ceph: waiting for block device %s to appear' % blk_device,
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level=INFO)
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count += 1
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time.sleep(1)
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else:
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log('ceph: Formatting block device %s as filesystem %s.' %
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(blk_device, fstype), level=INFO)
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check_call(['mkfs', '-t', fstype, blk_device])
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def place_data_on_ceph(service, blk_device, data_src_dst, fstype='ext4'):
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# mount block device into /mnt
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mount(blk_device, '/mnt')
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# copy data to /mnt
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try:
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copy_files(data_src_dst, '/mnt')
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except:
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pass
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# umount block device
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umount('/mnt')
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_dir = os.stat(data_src_dst)
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uid = _dir.st_uid
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gid = _dir.st_gid
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# re-mount where the data should originally be
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mount(blk_device, data_src_dst, persist=True)
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# ensure original ownership of new mount.
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cmd = ['chown', '-R', '%s:%s' % (uid, gid), data_src_dst]
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check_call(cmd)
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# TODO: re-use
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def modprobe_kernel_module(module):
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log('ceph: Loading kernel module', level=INFO)
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cmd = ['modprobe', module]
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check_call(cmd)
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cmd = 'echo %s >> /etc/modules' % module
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check_call(cmd, shell=True)
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def copy_files(src, dst, symlinks=False, ignore=None):
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for item in os.listdir(src):
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s = os.path.join(src, item)
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d = os.path.join(dst, item)
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if os.path.isdir(s):
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shutil.copytree(s, d, symlinks, ignore)
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else:
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shutil.copy2(s, d)
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def ensure_ceph_storage(service, pool, rbd_img, sizemb, mount_point,
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blk_device, fstype, system_services=[]):
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"""
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To be called from the current cluster leader.
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Ensures given pool and RBD image exists, is mapped to a block device,
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and the device is formatted and mounted at the given mount_point.
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If formatting a device for the first time, data existing at mount_point
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will be migrated to the RBD device before being remounted.
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All services listed in system_services will be stopped prior to data
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migration and restarted when complete.
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"""
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# Ensure pool, RBD image, RBD mappings are in place.
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if not pool_exists(service, pool):
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log('ceph: Creating new pool %s.' % pool, level=INFO)
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create_pool(service, pool)
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if not rbd_exists(service, pool, rbd_img):
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log('ceph: Creating RBD image (%s).' % rbd_img, level=INFO)
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create_rbd_image(service, pool, rbd_img, sizemb)
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if not image_mapped(rbd_img):
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log('ceph: Mapping RBD Image as a Block Device.', level=INFO)
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map_block_storage(service, pool, rbd_img)
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# make file system
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# TODO: What happens if for whatever reason this is run again and
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# the data is already in the rbd device and/or is mounted??
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# When it is mounted already, it will fail to make the fs
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# XXX: This is really sketchy! Need to at least add an fstab entry
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# otherwise this hook will blow away existing data if its executed
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# after a reboot.
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if not filesystem_mounted(mount_point):
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make_filesystem(blk_device, fstype)
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for svc in system_services:
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if running(svc):
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log('Stopping services %s prior to migrating data.' % svc,
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level=INFO)
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service_stop(svc)
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place_data_on_ceph(service, blk_device, mount_point, fstype)
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for svc in system_services:
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service_start(svc)
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