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Commit 814978b9 authored by Łukasz Nowak's avatar Łukasz Nowak
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kvm: Implement external-disk 

Support absolute and relative paths. Paths starting with "rbd:" are special,
and they point to the rbd endpoint, served by Ceph.

cache parameter is optional, in case if present, will be used as-is, even with
empty cache.

external-disk-number, external-disk-size and external-disk-format has been
removed from the schema to become hidden, nevertheless it's expected to be
fully supported, as long tests are kept.
parent 7db22d98
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Showing with 344 additions and 82 deletions
software/kvm/README.rst
View file @ 814978b9
......@@ -72,12 +72,6 @@ KVM instance parameters:
- hard-drive-url-check-certificate (default: True)
if virtual-hard-drive-url use self-signed https, then specify if https certificate should be verified or not
- external-disk-number (default: 0)
Number of additional disk to attach to this VM. Need slapformat to be configured for this feature.
- external-disk-size (default: 20)
- external-disk-format (default: qcow2)
additional disk format. should be in this list: ['qcow2', 'raw', 'vdi', 'vmdk', 'cloop', 'qed']
- enable-http-server (default: False)
Configure server that will help to get some files into the vm from http
require use-nat = True
......@@ -126,3 +120,79 @@ Updating boot-image-url-select
* update the ``boot-image-url-select`` in:
* ``instance-kvm-input-schema.json``
* ``instance-kvm-cluster-input-schema.json``
Migration to modern external-disk parameter
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Despite `external-disk-number`, `external-disk-size` and `external-disk-format`
are supported fully until unknown moment in the future, it's advised to migrate
to external-disk parameter as soon as possible, as slapos.core `slapos.cfg`
`instance_storage_home` can become obsoleted and removed in future versions.
**Note**: Due to how technically `instance_storage_home` is implemented, such
migration requires full access to the Compute Node hosting given KVM instance.
Let's imagine that there is a kvm instance which was requested with parameters::
{
"external-disk-number": 2,
"external-disk-size": 10
}
After locating the partition on proper Compute Node, the node administrator
has to find the kvm processing running there with::
slapos node status slappartNN: | grep kvm-
The interesting part is the `PID`, which can be used to find which disk paths
are configured for the running KVM process with::
ps axu | grep PID | grep --color DATA
It will be possible to find two entires pointing to `DATA` directory in the
partition::
-drive file=/srv/slapgrid/slappartNN/DATA/dataX/kvm_virtual_disk.qcow2,if=virtio
-drive file=/srv/slapgrid/slappartNN/DATA/dataY/kvm_virtual_disk.qcow2,if=virtio
**Attention**: Order of the disks is important.
The administrator shall provide absolute path to both for both disks::
readlink -f /srv/slapgrid/slappartNN/DATA/dataX/kvm_virtual_disk.qcow2 --> /<instance_storage_home>/dataX/slappartNN/kvm_virtual_disk.qcow2
readlink -f /srv/slapgrid/slappartNN/DATA/dataY/kvm_virtual_disk.qcow2 --> /<instance_storage_home>/dataY/slappartNN/kvm_virtual_disk.qcow2
And now it will be safe to use the paths in `external-disk` parameter::
{
"external-disk": {
"first": {
"path": "/<instance_storage_home>/dataX/slappartNN/kvm_virtual_disk.qcow2",
"index": 1
},
"second": {
"path": "/<instance_storage_home>/dataY/slappartNN/kvm_virtual_disk.qcow2",
"index": 2
}
}
}
Of course `external-disk-numer` and `external-disk-size` HAVE TO be removed
from instance parameters before continuing.
For now such configuration will lead to no starting kvm process, so after
parameters are updated in SlapOS Master **and** are processed on the Compute
Node The administrator shall release the images from automatic detection by
removing files:
* `etc/.data-disk-amount`
* `etc/.data-disk-ids`
from the partition (typically `/srv/slappartNN/` directory).
The failure observed to confirm the situation can be found in
`.slappartNN_kvm-HASH.log` with presence of message like::
qemu-system-x86_64: -drive file=/<instance_storage_home>/dataX/slappartNN/kvm_virtual_disk.qcow2,if=virtio,cache=writeback: Failed to get "write"
lock
Is another process using the image [/<instance_storage_home>/dataX/slappartNN/kvm_virtual_disk.qcow2]?
software/kvm/buildout.hash.cfg
View file @ 814978b9
......@@ -19,11 +19,11 @@ md5sum = 7e90da1f6dac4233e1aa3248f48e357c
[template-kvm]
filename = instance-kvm.cfg.jinja2
md5sum = 4a3f999a8d1705c0cabf58d563953d4d
md5sum = 44dc93281f2fffe64d014754fae1b38a
[template-kvm-cluster]
filename = instance-kvm-cluster.cfg.jinja2.in
md5sum = 406bf455afe1c71cb0e8cc04dd877f1d
md5sum = c00608f94ff6cfd8d37a280267c7227f
[template-kvm-resilient]
filename = instance-kvm-resilient.cfg.jinja2
......@@ -55,7 +55,7 @@ md5sum = a8cf453d20f01c707f02c4b4014580d8
[template-kvm-run]
filename = template/template-kvm-run.in
md5sum = 6c100eec00de5e53f64b075dd69a9865
md5sum = ea5b8a588869f791b36c17345d016c62
[template-kvm-controller]
filename = template/kvm-controller-run.in
......
software/kvm/instance-kvm-cluster-input-schema.json
View file @ 814978b9
......@@ -392,34 +392,6 @@
"type": "boolean",
"default": true
},
"external-disk-number": {
"title": "Number of additional disk to create for virtual machine",
"description": "Specify the number of additional disk to create for virtual machine in data folder of SlapOS Node. Requires instance_storage_home to be configured on SlapOS Node.",
"type": "integer",
"minimum": 0,
"default": 0
},
"external-disk-size": {
"title": "Size of additional disk to create for virtual machine, in Gigabytes",
"description": "Specify the size of additional disk to create for virtual machine in data folder of SlapOS Node. Requires instance_storage_home to be configured on SlapOS Node.",
"type": "integer",
"minimum": 5,
"default": 20
},
"external-disk-format": {
"title": "Type of external disk drive to create by QEMU.",
"description": "Type of QEMU disk drive, to create.",
"type": "string",
"default": "qcow2",
"enum": [
"qcow2",
"raw",
"vdi",
"vmdk",
"cloop",
"qed"
]
},
"wipe-disk-ondestroy": {
"title": "Wipe disks when destroy the VM",
"description": "Say if disks should be wiped by writing new data over every single bit before delete them. This option is used to securely delete VM disks",
......@@ -545,6 +517,58 @@
"description": "List of whitelisted domain names to be accessed from the VM. They will be resolved to IPs depending on where the VM end up. IPs can be used too.",
"type": "string",
"textarea": true
},
"external-disk": {
"title": "External disks",
"description": "Allows to set paths and types of manually provided external disks. Use index to order disks. Changing this parameter leads to kvm process restart.",
"type": "object",
"default": {},
"patternProperties": {
".*": {
"properties": {
"path": {
"title": "Path to the provided image",
"description": "Absolute or relative to the instance root path to the provided image. Image has to be provided, and being fully accessible, read and write, by the instance user for the kvm to start. Please note, that if the name starts with 'rbd:' it's considered special and won't be used as relative path.",
"type": "string"
},
"format": {
"title": "Format of a disk image",
"description": "Format of a disk image. Note: rbd type is experimental.",
"type": "string",
"default": "autodetect",
"enum": [
"autodetect",
"qcow2",
"rbd",
"raw",
"vdi",
"vmdk",
"cloop",
"qed"
]
},
"cache": {
"title": "Cache value for the disk",
"description": "Cache value directly passed to the kvm -drive invocation as cache=value.",
"type": "string",
"default": "writeback",
"enum": [
"writeback",
"none",
"unsafe",
"directsync",
"writethrough"
]
},
"index": {
"title": "Index of a disk",
"description": "An index value used to order disks for the VM, if not specified, disk order will be random on each run.",
"type": "integer",
"default": 0
}
}
}
}
}
},
"type": "object"
......
software/kvm/instance-kvm-cluster.cfg.jinja2.in
View file @ 814978b9
......@@ -139,7 +139,7 @@ config-wipe-disk-iterations = {{ dumps(kvm_parameter_dict.get('wipe-disk-iterati
config-document-host = ${apache-conf:ip}
config-document-port = ${apache-conf:port}
config-document-path = ${hash-code:passwd}
{%- for k in ['boot-image-url-list', 'boot-image-url-select', 'whitelist-domains'] %}
{%- for k in ['boot-image-url-list', 'boot-image-url-select', 'whitelist-domains', 'external-disk'] %}
{#- play nice - use parameter only if present #}
{%- if k in kvm_parameter_dict %}
{#- play safe - dumps value #}
......
software/kvm/instance-kvm-input-schema.json
View file @ 814978b9
......@@ -193,34 +193,6 @@
"type": "boolean",
"default": true
},
"external-disk-number": {
"title": "Number of additional disk to create for virtual machine",
"description": "Specify the number of additional disk to create for virtual machine in data folder of SlapOS Node. Requires instance_storage_home to be configured on SlapOS Node.",
"type": "integer",
"minimum": 0,
"default": 0
},
"external-disk-size": {
"title": "Size of additional disk to create for virtual machine, in Gigabytes",
"description": "Specify the size of additional disk to create for virtual machine in data folder of SlapOS Node. Requires instance_storage_home to be configured on SlapOS Node.",
"type": "integer",
"minimum": 1,
"default": 20
},
"external-disk-format": {
"title": "Type of external disk drive to create by QEMU.",
"description": "Type of QEMU disk drive, to create.",
"type": "string",
"default": "qcow2",
"enum": [
"qcow2",
"raw",
"vdi",
"vmdk",
"cloop",
"qed"
]
},
"wipe-disk-ondestroy": {
"title": "Wipe disks when destroy the VM",
"description": "Say if disks should be wiped by writing new data over every single bit before delete them. This option is used to securely delete VM disks",
......@@ -402,6 +374,58 @@
"description": "List of whitelisted domain names to be accessed from the VM. They will be resolved to IPs depending on where the VM end up. IPs can be used too.",
"type": "string",
"textarea": true
},
"external-disk": {
"title": "External disks",
"description": "Allows to set paths and types of manually provided external disks. Use index to order disks. Changing this parameter leads to kvm process restart.",
"type": "object",
"default": {},
"patternProperties": {
".*": {
"properties": {
"path": {
"title": "Path to the provided image",
"description": "Absolute or relative to the instance root path to the provided image. Image has to be provided, and being fully accessible, read and write, by the instance user for the kvm to start. Please note, that if the name starts with 'rbd:' it's considered special and won't be used as relative path.",
"type": "string"
},
"format": {
"title": "Format of a disk image",
"description": "Format of a disk image. Note: rbd type is experimental.",
"type": "string",
"default": "autodetect",
"enum": [
"autodetect",
"qcow2",
"rbd",
"raw",
"vdi",
"vmdk",
"cloop",
"qed"
]
},
"cache": {
"title": "Cache value for the disk",
"description": "Cache value directly passed to the kvm -drive invocation as cache=value.",
"type": "string",
"default": "writeback",
"enum": [
"writeback",
"none",
"unsafe",
"directsync",
"writethrough"
]
},
"index": {
"title": "Index of a disk",
"description": "An index value used to order disks for the VM, if not specified, disk order will be random on each run.",
"type": "integer",
"default": 0
}
}
}
}
}
}
}
software/kvm/instance-kvm.cfg.jinja2
View file @ 814978b9
......@@ -471,6 +471,9 @@ disk-storage-list =
external-disk-number = ${slap-parameter:external-disk-number}
external-disk-size = ${slap-parameter:external-disk-size}
external-disk-format = ${slap-parameter:external-disk-format}
# new external-disk parameter
external-disk = ${slap-parameter:external-disk}
instance-root = ${buildout:directory}
{% if enable_http -%}
httpd-port = ${slap-parameter:httpd-port}
......@@ -1091,6 +1094,7 @@ hard-drive-url-check-certificate = True
external-disk-number = 0
external-disk-size = 20
external-disk-format = qcow2
external-disk = {}
# Help to get some configuration files into the vm from http
enable-http-server = False
......
software/kvm/template/template-kvm-run.in
View file @ 814978b9
......@@ -12,6 +12,7 @@ from random import shuffle
import glob
import re
import json
import operator
# XXX: give all of this through parameter, don't use this as template, but as module
qemu_img_path = {{ repr(parameter_dict["qemu-img-path"]) }}
......@@ -46,6 +47,8 @@ pid_file_path = '{{ parameter_dict.get("pid-file-path") }}'
external_disk_number = {{ parameter_dict.get("external-disk-number") }}
external_disk_size = {{ parameter_dict.get("external-disk-size") }}
external_disk_format = {{ repr(parameter_dict["external-disk-format"]) }}
external_disk = {{ parameter_dict['external-disk'] }}
instance_root = '{{ parameter_dict['instance-root'] }}'
disk_storage_dict = {}
disk_storage_list = """{{ parameter_dict.get("disk-storage-list") }}""".split('\n')
map_storage_list = []
......@@ -305,6 +308,31 @@ for disk in additional_disk_list:
kvm_argument_list.extend([
'-drive', 'file=%s,if=%s' % (disk, disk_type)])
# allow empty index if one disk is provided
for entry in external_disk.keys():
if 'index' not in external_disk[entry]:
external_disk[entry]['index'] = 0
# support external-disk parameter
for disk_info in sorted(external_disk.values(), key=operator.itemgetter('index')):
if disk_info['path'].startswith('rbd:') or disk_info['path'].startswith('/'):
path = disk_info['path']
else:
path = os.path.join(instance_root, disk_info['path'])
drive_argument_list = [
"file=%s" %( path,),
"if=%s" % (disk_type,),
"cache=%s" % (disk_info.get('cache', 'writeback'),)
]
if disk_info.get('format', 'autodetect') != 'autodetect':
drive_argument_list.append(
"format=%s" % (disk_info['format'],)
)
kvm_argument_list += (
'-drive',
",".join(drive_argument_list)
)
if auto_ballooning:
kvm_argument_list.extend(['-device', 'virtio-balloon-pci,id=balloon0'])
......
software/kvm/test/test.py
View file @ 814978b9
......@@ -1868,8 +1868,25 @@ class TestParameterCluster(TestParameterDefault):
return 'kvm-cluster'
class ExternalDiskMixin(KvmMixin):
def getRunningDriveList(self, kvm_instance_partition):
_match_drive = re.compile('file.*if=virtio.*').match
with self.slap.instance_supervisor_rpc as instance_supervisor:
kvm_pid = next(q for q in instance_supervisor.getAllProcessInfo()
if 'kvm-' in q['name'])['pid']
drive_list = []
for entry in psutil.Process(kvm_pid).cmdline():
m = _match_drive(entry)
if m:
path = m.group(0)
drive_list.append(
path.replace(kvm_instance_partition, '${partition}')
)
return drive_list
@skipUnlessKvm
class TestExternalDisk(InstanceTestCase, KvmMixin):
class TestExternalDisk(InstanceTestCase, ExternalDiskMixin):
__partition_reference__ = 'ed'
kvm_instance_partition_reference = 'ed0'
......@@ -1958,21 +1975,6 @@ class TestExternalDisk(InstanceTestCase, KvmMixin):
super(TestExternalDisk, cls).tearDownClass()
shutil.rmtree(cls.working_directory)
def getRunningDriveList(self, kvm_instance_partition):
_match_drive = re.compile('file=(.+),if=virtio').match
with self.slap.instance_supervisor_rpc as instance_supervisor:
kvm_pid = next(q for q in instance_supervisor.getAllProcessInfo()
if 'kvm-' in q['name'])['pid']
dirve_list = []
for entry in psutil.Process(kvm_pid).cmdline():
m = _match_drive(entry)
if m:
path = m.group(1)
dirve_list.append(
path.replace(kvm_instance_partition, '${partition}')
)
return dirve_list
def test(self):
kvm_instance_partition = os.path.join(
self.slap.instance_directory, self.kvm_instance_partition_reference)
......@@ -2005,3 +2007,113 @@ class TestExternalDisk(InstanceTestCase, KvmMixin):
class TestExternalDiskJson(
KvmMixinJson, TestExternalDisk):
pass
@skipUnlessKvm
class TestExternalDiskModern(InstanceTestCase, ExternalDiskMixin):
__partition_reference__ = 'edm'
kvm_instance_partition_reference = 'edm0'
@classmethod
def getInstanceSoftwareType(cls):
return 'default'
@classmethod
def setUpClass(cls):
super(TestExternalDiskModern, cls).setUpClass()
def getExternalDiskInstanceParameterDict(self, first, second, third):
return {
"external-disk": {
"second disk": {
"path": second,
"index": 2,
},
"third disk": {
"path": third,
"index": 3,
"cache": "none"
},
"first disk": {
"path": first,
"index": 1,
"format": "qcow"
},
}
}
def test(self):
# Disks can't be created in /tmp, as it's specially mounted on testnodes
# and then KVM can't use them:
# -drive file=/tmp/tmpX/third_disk,if=virtio,cache=none: Could not open
# '/tmp/tmpX/third_disk': filesystem does not support O_DIRECT
self.working_directory = tempfile.mkdtemp(dir=self.slap.instance_directory)
self.addCleanup(shutil.rmtree, self.working_directory)
kvm_instance_partition = os.path.join(
self.slap.instance_directory, self.kvm_instance_partition_reference)
# find qemu_img from the tested SR via it's partition parameter, as
# otherwise qemu-kvm would be dependency of test suite
with open(
os.path.join(self.computer_partition_root_path, 'buildout.cfg')) as fh:
qemu_img = [
q for q in fh.readlines()
if 'raw qemu_img_executable_location' in q][0].split()[-1]
self.first_disk = os.path.join(self.working_directory, 'first_disk')
subprocess.check_call([
qemu_img, "create", "-f", "qcow", self.first_disk, "1M"])
second_disk = 'second_disk'
self.second_disk = os.path.join(kvm_instance_partition, second_disk)
subprocess.check_call([
qemu_img, "create", "-f", "qcow2", os.path.join(
kvm_instance_partition, self.second_disk), "1M"])
self.third_disk = os.path.join(self.working_directory, 'third_disk')
subprocess.check_call([
qemu_img, "create", "-f", "qcow2", self.third_disk, "1M"])
self.rerequestInstance({'_': json.dumps(
self.getExternalDiskInstanceParameterDict(
self.first_disk, second_disk, self.third_disk))})
self.waitForInstance()
drive_list = self.getRunningDriveList(kvm_instance_partition)
self.assertEqual(
drive_list,
[
'file=${partition}/srv/virtual.qcow2,if=virtio,discard=on,'
'format=qcow2',
'file=%s/first_disk,if=virtio,cache=writeback,format=qcow' % (
self.working_directory,),
'file=${partition}/second_disk,if=virtio,cache=writeback',
'file=%s/third_disk,if=virtio,cache=none' % (
self.working_directory,)
]
)
@skipUnlessKvm
class TestExternalDiskModernCluster(TestExternalDiskModern):
kvm_instance_partition_reference = 'edm1'
@classmethod
def getInstanceParameterDict(cls):
return {'_': json.dumps({
"kvm-partition-dict": {
"kvm-default": {
"disable-ansible-promise": True,
}
}
})}
@classmethod
def getInstanceSoftwareType(cls):
return 'kvm-cluster'
def getExternalDiskInstanceParameterDict(self, *args, **kwargs):
partition_dict = super(
TestExternalDiskModernCluster, self
).getExternalDiskInstanceParameterDict(*args, **kwargs)
partition_dict.update({"disable-ansible-promise": True})
return {
"kvm-partition-dict": {
"kvm-default": partition_dict
}
}
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