openstack
/
openstack-helm-infra
Code Issues Proposed changes

Update documentation for recent failure domain options in Ceph 

Change-Id: Id6707566753b834da598b62f630f4caafe8ee234
This commit is contained in:
Matthew Heler 2018-12-13 11:11:46 -06:00
parent 6589af54db
commit b18dd351d2
1 changed files with 148 additions and 403 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

551
doc/source/testing/ceph-resiliency/failure-domain.rst
View File

@ -51,8 +51,9 @@ Ceph Environment
================
The ceph commands and scripts described in this write-up are executed as
Linux user root on one of the ceph monitors deployed as kubernetes
pods. The root user has the credential to execute all the ceph commands.
Linux user root on one of orchestration nodes and one of the ceph monitors
deployed as kubernetes pods. The root user has the credential to execute
all the ceph commands.
On a kubernetes cluster, a separate namespace named **ceph** is configured
for the ceph cluster. Include the **ceph** namespace in **kubectl** when
@ -386,11 +387,11 @@ Verify the Ceph cluster has a CRUSH rule with rack as the failure domain.
::
# ceph osd crush rule ls
replicated_rack
# ceph osd crush rule dump replicated_rack
rack_replicated_rule
# ceph osd crush rule dump rack_replicated_rule
{
"rule_id": 2,
"rule_name": "replicated_rack",
"rule_name": "rack_replicated_rule",
"ruleset": 2,
"type": 1,
"min_size": 1,
@ -416,10 +417,10 @@ Create a ceph pool with its CRUSH rule set to the rack's rule.
::
# ceph osd pool create rbd 2048 2048 replicated replicated_rack
# ceph osd pool create rbd 2048 2048 replicated rack_replicated_rule
pool 'rbd' created
# ceph osd pool get rbd crush_rule
crush_rule: replicated_rack
crush_rule: rack_replicated_rule
# ceph osd pool get rbd size
size: 3
# ceph osd pool get rbd pg_num
@ -570,6 +571,7 @@ To see weight and affinity of each OSD.
23 hdd 1.09000 osd.23 up 1.00000 1.00000
crushtool CLI
-------------
@ -658,418 +660,161 @@ The **utils-checkPGs.py** script can read the same data from memory and construc
the failure domains with OSDs. Verify the OSDs in each PG against the
constructed failure domains.
You can edit the **/tmp/cm.rack.ascii** to modify the CRUSH Map. Compile
the modified ascii file into binary that has the new CRUSH Map. To set
the running ceph cluster with the new CRUSH Map, execute the following
commands on one of the monitor nodes:
Configure the Failure Domain in CRUSH Map
=========================================
The Ceph ceph-osd, ceph-client and cinder charts accept configuration parameters to set the Failure Domain for CRUSH.
The options available are **failure_domain**, **failure_domain_by_hostname**, **failure_domain_name** and **crush_rule**
::
# vi /tmp/cm.rack.ascii
# crushtool -c /tmp/cm.rack.ascii -o /tmp/cm.bin.new
# ceph osd setcrushmap -i /tmp/cm.bin.new
# watch ceph status
ceph-osd specific overrides
failure_domain: Set the CRUSH bucket type for your OSD to reside in. (DEFAULT: "host")
failure_domain_by_hostname: Specify the portion of the hostname to use for your failure domain bucket name. (DEFAULT: "false")
failure_domain_name: Manually name the failure domain bucket name. This configuration option should only be used when using host based overrides. (DEFAULT: "false")
::
ceph-client and cinder specific overrides
crush_rule**: Set the crush rule for a pool (DEFAULT: "replicated_rule")
An example of a lab enviroment had the following paramters set for the ceph yaml override file to apply a rack level failure domain within CRUSH.
::
endpoints:
identity:
namespace: openstack
object_store:
namespace: ceph
ceph_mon:
namespace: ceph
network:
public: 10.0.0.0/24
cluster: 10.0.0.0/24
deployment:
storage_secrets: true
ceph: true
rbd_provisioner: true
cephfs_provisioner: true
client_secrets: false
rgw_keystone_user_and_endpoints: false
bootstrap:
enabled: true
conf:
ceph:
global:
fsid: 6c12a986-148d-45a7-9120-0cf0522ca5e0
rgw_ks:
enabled: true
pool:
default:
crush_rule: rack_replicated_rule
crush:
tunables: null
target:
# NOTE(portdirect): 5 nodes, with one osd per node
osd: 18
pg_per_osd: 100
storage:
osd:
- data:
type: block-logical
location: /dev/vdb
journal:
type: block-logical
location: /dev/vde1
- data:
type: block-logical
location: /dev/vdc
journal:
type: block-logical
location: /dev/vde2
- data:
type: block-logical
location: /dev/vdd
journal:
type: block-logical
location: /dev/vde3
overrides:
ceph_osd:
hosts:
- name: osh-1
conf:
storage:
failure_domain: "rack"
failure_domain_name: "rack1"
- name: osh-2
conf:
storage:
failure_domain: "rack"
failure_domain_name: "rack1"
- name: osh-3
conf:
storage:
failure_domain: "rack"
failure_domain_name: "rack2"
- name: osh-4
conf:
storage:
failure_domain: "rack"
failure_domain_name: "rack2"
- name: osh-5
conf:
storage:
failure_domain: "rack"
failure_domain_name: "rack3"
- name: osh-6
conf:
storage:
failure_domain: "rack"
failure_domain_name: "rack3"
.. NOTE::
You have to know the CRUSH Map syntax really well in order for you to be able to manually edit the ascii file.
Buckets
-------
You have a pre-existing Ceph cluster that did not have the rack
buckets. You want to restructure the CRUSH hierarchy with the rack
buckets to a topology that is similar to the one presented earlier in
this guide.
Note that the cinder chart will need an override configured to ensure the cinder pools in Ceph are using the correct **crush_rule**.
::
root@host3:/# ceph osd crush tree
ID CLASS WEIGHT TYPE NAME
-1 78.47974 root default
-2 13.07996 host host1
0 hdd 1.09000 osd.0
1 hdd 1.09000 osd.1
2 hdd 1.09000 osd.2
3 hdd 1.09000 osd.3
4 hdd 1.09000 osd.4
5 hdd 1.09000 osd.5
6 hdd 1.09000 osd.6
7 hdd 1.09000 osd.7
8 hdd 1.09000 osd.8
9 hdd 1.09000 osd.9
10 hdd 1.09000 osd.10
11 hdd 1.09000 osd.11
-5 13.07996 host host2
12 hdd 1.09000 osd.12
13 hdd 1.09000 osd.13
14 hdd 1.09000 osd.14
15 hdd 1.09000 osd.15
16 hdd 1.09000 osd.16
17 hdd 1.09000 osd.17
18 hdd 1.09000 osd.18
19 hdd 1.09000 osd.19
20 hdd 1.09000 osd.20
21 hdd 1.09000 osd.21
22 hdd 1.09000 osd.22
23 hdd 1.09000 osd.23
-13 13.07996 host host3
60 hdd 1.09000 osd.60
61 hdd 1.09000 osd.61
62 hdd 1.09000 osd.62
63 hdd 1.09000 osd.63
64 hdd 1.09000 osd.64
65 hdd 1.09000 osd.65
66 hdd 1.09000 osd.66
67 hdd 1.09000 osd.67
68 hdd 1.09000 osd.68
69 hdd 1.09000 osd.69
70 hdd 1.09000 osd.70
71 hdd 1.09000 osd.71
-9 13.07996 host host4
36 hdd 1.09000 osd.36
37 hdd 1.09000 osd.37
38 hdd 1.09000 osd.38
39 hdd 1.09000 osd.39
40 hdd 1.09000 osd.40
41 hdd 1.09000 osd.41
42 hdd 1.09000 osd.42
43 hdd 1.09000 osd.43
44 hdd 1.09000 osd.44
45 hdd 1.09000 osd.45
46 hdd 1.09000 osd.46
47 hdd 1.09000 osd.47
-11 13.07996 host host5
48 hdd 1.09000 osd.48
49 hdd 1.09000 osd.49
50 hdd 1.09000 osd.50
51 hdd 1.09000 osd.51
52 hdd 1.09000 osd.52
53 hdd 1.09000 osd.53
54 hdd 1.09000 osd.54
55 hdd 1.09000 osd.55
56 hdd 1.09000 osd.56
57 hdd 1.09000 osd.57
58 hdd 1.09000 osd.58
59 hdd 1.09000 osd.59
-7 13.07996 host host6
24 hdd 1.09000 osd.24
25 hdd 1.09000 osd.25
26 hdd 1.09000 osd.26
27 hdd 1.09000 osd.27
28 hdd 1.09000 osd.28
29 hdd 1.09000 osd.29
30 hdd 1.09000 osd.30
31 hdd 1.09000 osd.31
32 hdd 1.09000 osd.32
33 hdd 1.09000 osd.33
34 hdd 1.09000 osd.34
35 hdd 1.09000 osd.35
root@host3:/#
pod:
replicas:
api: 2
volume: 1
scheduler: 1
backup: 1
conf:
cinder:
DEFAULT:
backup_driver: cinder.backup.drivers.swift
ceph:
pools:
backup:
replicated: 3
crush_rule: rack_replicated_rule
chunk_size: 8
volume:
replicated: 3
crush_rule: rack_replicated_rule
chunk_size: 8
To include the rack bucket in the CRUSH Map, follow these steps. First, add
the required rack buckets with the user-defined names.
The charts can be updated with these overrides pre or post deployment. If this is a post deployment change then the following steps will apply for a gate based openstack-helm deployment.
::
root@host5:/# ceph osd crush add-bucket rack1 rack
added bucket rack1 type rack to crush map
root@host5:/# ceph osd crush add-bucket rack2 rack
added bucket rack2 type rack to crush map
root@host5:/# ceph osd crush add-bucket rack3 rack
added bucket rack3 type rack to crush map
root@host5:/# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-17 0 rack rack3
-16 0 rack rack2
-15 0 rack rack1
-1 78.47974 root default
. . .
cd /opt/openstack-helm
helm upgrade --install ceph-osd ../openstack-helm-infra/ceph-osd --namespace=ceph --values=/tmp/ceph.yaml
kubectl delete jobs/ceph-rbd-pool -n ceph
helm upgrade --install ceph-client ../openstack-helm-infra/ceph-client --namespace=ceph --values=/tmp/ceph.yaml
helm delete cinder --purge
helm upgrade --install cinder ./cinder --namespace=openstack --values=/tmp/cinder.yaml
Move the hosts to the respective rack buckets.
.. NOTE::
::
There will be a brief interuption of I/O and a data movement of placement groups in Ceph while these changes are
applied. The data movement operation can take several minutes to several days to complete.
root@host5:/# ceph osd crush move host1 rack=rack1
moved item id -2 name 'host1' to location {rack=rack1} in crush map
root@host5:/# ceph osd crush move host2 rack=rack1
moved item id -5 name 'host2' to location {rack=rack1} in crush map
Move the newly created rack rack1 to the root bucket. Verify the new
hierarchy with the ceph CLI.
::
root@host5:/# ceph osd crush move rack1 root=default
moved item id -15 name 'rack1' to location {root=default} in crush map
root@host5:/# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-17 0 rack rack3
-16 0 rack rack2
-1 78.47974 root default
-15 26.15991 rack rack1
-2 13.07996 host host1
0 hdd 1.09000 osd.0 up 1.00000 1.00000
1 hdd 1.09000 osd.1 up 1.00000 1.00000
2 hdd 1.09000 osd.2 up 1.00000 1.00000
3 hdd 1.09000 osd.3 up 1.00000 1.00000
4 hdd 1.09000 osd.4 up 1.00000 1.00000
5 hdd 1.09000 osd.5 up 1.00000 1.00000
6 hdd 1.09000 osd.6 up 1.00000 1.00000
7 hdd 1.09000 osd.7 up 1.00000 1.00000
8 hdd 1.09000 osd.8 up 1.00000 1.00000
9 hdd 1.09000 osd.9 up 1.00000 1.00000
10 hdd 1.09000 osd.10 up 1.00000 1.00000
11 hdd 1.09000 osd.11 up 1.00000 1.00000
-5 13.07996 host host2
12 hdd 1.09000 osd.12 up 1.00000 1.00000
13 hdd 1.09000 osd.13 up 1.00000 1.00000
14 hdd 1.09000 osd.14 up 1.00000 1.00000
15 hdd 1.09000 osd.15 up 1.00000 1.00000
16 hdd 1.09000 osd.16 up 1.00000 1.00000
17 hdd 1.09000 osd.17 up 1.00000 1.00000
18 hdd 1.09000 osd.18 up 1.00000 1.00000
19 hdd 1.09000 osd.19 up 1.00000 1.00000
20 hdd 1.09000 osd.20 up 1.00000 1.00000
21 hdd 1.09000 osd.21 up 1.00000 1.00000
22 hdd 1.09000 osd.22 up 1.00000 1.00000
23 hdd 1.09000 osd.23 up 1.00000 1.00000
. . .
Repeat the same for rack2.
::
root@host5:/# ceph osd crush move host3 rack=rack2
moved item id -13 name 'host3' to location {rack=rack2} in crush map
root@host5:/# ceph osd crush move host4 rack=rack2
moved item id -9 name 'host4' to location {rack=rack2} in crush map
root@host5:/# ceph osd crush move rack2 root=default
moved item id -16 name 'rack2' to location {root=default} in crush map
Repeat the same for rack3.
::
root@host5:/# ceph osd crush move host5 rack=rack3
moved item id -11 name 'host5' to location {rack=rack3} in crush map
root@host5:/# ceph osd crush move host6 rack=rack3
moved item id -7 name 'host6' to location {rack=rack3} in crush map
root@host5:/# ceph osd crush move rack3 root=default
moved item id -17 name 'rack3' to location {root=default} in crush map
Extract the CRUSH Map from the in-memory copy and verify.
::
root@host5:/# ceph osd getcrushmap -o /tmp/cm.bin.racks.6
100
root@host5:/# crushtool -d /tmp/cm.bin.racks.6 -o /tmp/cm.ascii.racks.6
root@host5:/# cat /tmp/cm.ascii.racks.6
. . .
# buckets
host host1 {
id -2 # do not change unnecessarily
id -3 class hdd # do not change unnecessarily
# weight 13.080
alg straw2
hash 0 # rjenkins1
item osd.0 weight 1.090
item osd.1 weight 1.090
item osd.2 weight 1.090
item osd.3 weight 1.090
item osd.4 weight 1.090
item osd.5 weight 1.090
item osd.6 weight 1.090
item osd.7 weight 1.090
item osd.8 weight 1.090
item osd.9 weight 1.090
item osd.10 weight 1.090
item osd.11 weight 1.090
}
host host2 {
id -5 # do not change unnecessarily
id -6 class hdd # do not change unnecessarily
# weight 13.080
alg straw2
hash 0 # rjenkins1
item osd.12 weight 1.090
item osd.13 weight 1.090
item osd.14 weight 1.090
item osd.15 weight 1.090
item osd.16 weight 1.090
item osd.18 weight 1.090
item osd.19 weight 1.090
item osd.17 weight 1.090
item osd.20 weight 1.090
item osd.21 weight 1.090
item osd.22 weight 1.090
item osd.23 weight 1.090
}
rack rack1 {
id -15 # do not change unnecessarily
id -20 class hdd # do not change unnecessarily
# weight 26.160
alg straw2
hash 0 # rjenkins1
item host1 weight 13.080
item host2 weight 13.080
}
host host3 {
id -13 # do not change unnecessarily
id -14 class hdd # do not change unnecessarily
# weight 13.080
alg straw2
hash 0 # rjenkins1
item osd.53 weight 1.090
item osd.54 weight 1.090
item osd.58 weight 1.090
item osd.59 weight 1.090
item osd.64 weight 1.090
item osd.65 weight 1.090
item osd.66 weight 1.090
item osd.67 weight 1.090
item osd.69 weight 1.090
item osd.68 weight 1.090
item osd.71 weight 1.090
item osd.70 weight 1.090
}
host host4 {
id -9 # do not change unnecessarily
id -10 class hdd # do not change unnecessarily
# weight 13.080
alg straw2
hash 0 # rjenkins1
item osd.36 weight 1.090
item osd.37 weight 1.090
item osd.38 weight 1.090
item osd.39 weight 1.090
item osd.40 weight 1.090
item osd.41 weight 1.090
item osd.42 weight 1.090
item osd.44 weight 1.090
item osd.45 weight 1.090
item osd.46 weight 1.090
item osd.47 weight 1.090
item osd.43 weight 1.090
}
rack rack2 {
id -16 # do not change unnecessarily
id -19 class hdd # do not change unnecessarily
# weight 26.160
alg straw2
hash 0 # rjenkins1
item host3 weight 13.080
item host4 weight 13.080
}
host host5 {
id -11 # do not change unnecessarily
id -12 class hdd # do not change unnecessarily
# weight 13.080
alg straw2
hash 0 # rjenkins1
item osd.49 weight 1.090
item osd.48 weight 1.090
item osd.50 weight 1.090
item osd.51 weight 1.090
item osd.52 weight 1.090
item osd.55 weight 1.090
item osd.56 weight 1.090
item osd.57 weight 1.090
item osd.60 weight 1.090
item osd.61 weight 1.090
item osd.62 weight 1.090
item osd.63 weight 1.090
}
host host6 {
id -7 # do not change unnecessarily
id -8 class hdd # do not change unnecessarily
# weight 13.080
alg straw2
hash 0 # rjenkins1
item osd.24 weight 1.090
item osd.25 weight 1.090
item osd.26 weight 1.090
item osd.27 weight 1.090
item osd.28 weight 1.090
item osd.29 weight 1.090
item osd.30 weight 1.090
item osd.31 weight 1.090
item osd.32 weight 1.090
item osd.33 weight 1.090
item osd.34 weight 1.090
item osd.35 weight 1.090
}
rack rack3 {
id -17 # do not change unnecessarily
id -18 class hdd # do not change unnecessarily
# weight 26.160
alg straw2
hash 0 # rjenkins1
item host5 weight 13.080
item host6 weight 13.080
}
root default {
id -1 # do not change unnecessarily
id -4 class hdd # do not change unnecessarily
# weight 78.480
alg straw2
hash 0 # rjenkins1
item rack1 weight 26.160
item rack2 weight 26.160
item rack3 weight 26.160
}
# rules
rule replicated_rule {
id 0
type replicated
min_size 1
max_size 10
step take default
step chooseleaf firstn 0 type host
step emit
}
rule same_host {
id 1
type replicated
min_size 1
max_size 10
step take default
step choose firstn 0 type osd
step emit
}
rule replicated_rack {
id 2
type replicated
min_size 1
max_size 10
step take default
step chooseleaf firstn 0 type rack
step emit
}
# end crush map
root@host5:/#
Create a CRUSH Rule with rack as the failure domain.
::
root@host5:/# ceph osd crush rule create-replicated replicated_rack default rack
Create a ceph pool that uses the new CRUSH Rule.
::
root@host5:/# ceph osd pool create cmTestPool 2048 2048 replicated replicated_rack
pool 'cmTestPool' created
root@host5:/# /tmp/utils-checkPGs.py cmTestPool
Checking PGs in pool cmTestPool ... Passed
utils-checkPGs.py Script
========================
The utils-checkPGs.py Script
============================
The purpose of the **utils-checkPGs.py** script is to check whether a PG has OSDs
allocated from the same failure domain. The violating PGs with their