Projet

Général

Profil

Management Cluster Ceph

Liens

Ajout d'un OSD classique

$ ceph-disk prepare --zap-disk --cluster-uuid 1fe74663-8dfa-486c-bb80-3bd94c90c967 --fs-type=ext4 /dev/sdX
$ tune2fs -c 0 -i 0 -m 0 /dev/sdX1
$ smartctl --smart=on /dev/sdX  # Pour le monitoring.

Récuperer l'id avec (c'est celui tout en bas pas accroché à l'arbre):

ceph osd tree

DEBUT WORKAROUND BUG PREPARE

Dans le cas ou l'osd est DOWN après le prepare c'est surement ce bug

ID est le premier numero libre d'osd en partant de zero (en bas du ceph osd tree)

mkdir /var/lib/ceph/osd/ceph-<ID>
chown ceph:ceph /var/lib/ceph/osd/ceph-<ID>
ceph-disk activate /dev/sd<X>1
systemctl status ceph-osd@<ID>

FIN WORKAROUND BUG PREPARE

Pour un HDD:

$ ceph osd crush add osd.<ID> 0 root=default host=<host>

Pour un SSD:

$ ceph osd crush add osd.<ID> 0 root=ssd host=<host>-ssd

Ensuite, autoriser Ceph à mettre des data dessus:

$ /root/tools/ceph-reweight-osds.sh osd.<ID>

Vider un OSD:

vider_osp(){
  name="$1" 
  ceph osd out ${name}
  ceph osd crush reweight ${name} 0
  ceph osd reweight ${name} 0
}

Suppression d'un OSD:

remove_osd(){
 name="$1" 
 ceph osd out ${name}
 systemctl stop ceph-osd@${name#osd.}
 ceph osd crush remove ${name}
 ceph auth del ${name}
 ceph osd rm ${name}
 ceph osd tree
}

Arrêter les IO de recovery:

ceph osd set nobackfill 
ceph osd set norebalance
ceph osd set norecover

Procédure d'upgrade


/!\Lire la release note (contient très très souvent des trucs à faire en plus) /!\

Upgrade des MONs:

Mettre le flags noout:

ceph osd set noout

Sur chaque MONs (g1/g2/g3)

apt-get upgrade -y
systemctl restart ceph-mon@g*
ceph -s

Note que seulement le node 'leader/master' va provoquer une micro/nano coupure, souvent c'est même invisible.

Upgrade des OSDs:

Pour chaque machine

apt-get upgrade -y
systemctl restart ceph-osd@*

Puis attendre que le recovery termine avant de faire la suivante.

Une fois toutes les OSDs upgrader et relancer, faire:

ceph osd unset noout

Remplacement à froid d'un tier cache:

upstream doc: http://docs.ceph.com/docs/master/rados/operations/cache-tiering/

ceph osd tier cache-mode ec8p2c forward
rados -p ec8p2c cache-flush-evict-all
ceph osd tier remove-overlay ec8p2
ceph osd tier remove ec8p2 ec8p2c

rados rmpool ec8p2c ec8p2c  --yes-i-really-really-mean-ita
ceph osd pool create ec8p2c 128 128 replicated

ceph osd tier add ec8p2 ec8p2c
ceph osd tier cache-mode ec8p2c writeback
ceph osd tier set-overlay ec8p2 ec8p2c

ceph osd pool set ec8p2c size 3
ceph osd pool set ec8p2c min_size 2
ceph osd pool set ec8p2c hit_set_type bloom

ceph osd pool set ec8p2c hit_set_count 1
ceph osd pool set ec8p2c hit_set_period 3600
ceph osd pool set ec8p2c target_max_bytes 200000000000
ceph osd pool set ec8p2c target_max_objects 10000000
ceph osd pool set ec8p2c cache_target_dirty_ratio 0.4
ceph osd pool set ec8p2c cache_target_full_ratio 0.8

Ajout d'un OSD qui partage le SSD avec l'OS (OBSOLETE PLUS COMPATIBLE AVEC LES FUTURES VERSION DE CEPH)

En général avec ceph, on donne un disque, ceph créé 2 partitions une pour le journal de l'OSD, l'autre pour les datas
mais pour le SSD de tetaneutral qui a aussi l'OS, voici la méthode

Création manuelle de la partition de data ceph /dev/sda2 ici

Debian (MBR format):

apt-get install partprobe
fdisk /dev/sda

n
p
<enter>
<enter>
<enter>
<enter>
w

$ partprobe

Ubuntu (GPT format):

# parted /dev/sdb
GNU Parted 2.3
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print                                                            
Model: ATA SAMSUNG MZ7KM480 (scsi)
Disk /dev/sdb: 480GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system     Flags
 1      1049kB  20.0GB  20.0GB  primary  ext4            boot
 2      20.0GB  36.0GB  16.0GB  primary  linux-swap(v1)

(parted) mkpart                                                           
Partition type?  primary/extended?                                        
Partition type?  primary/extended? primary
File system type?  [ext2]? xfs                                            
Start?                                                                    
Start? 36.0GB                                                             
End? 100%                                                                 
(parted) print                                                            
Model: ATA SAMSUNG MZ7KM480 (scsi)
Disk /dev/sdb: 480GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system     Flags
 1      1049kB  20.0GB  20.0GB  primary  ext4            boot
 2      20.0GB  36.0GB  16.0GB  primary  linux-swap(v1)
 3      36.0GB  480GB   444GB   primary

(parted) quit                                                             
Information: You may need to update /etc/fstab.

On prepare le disk comme normalement

ceph-disk prepare --fs-type=ext4 --cluster-uuid 1fe74663-8dfa-486c-bb80-3bd94c90c967 /dev/sda2
ceph-disk activate /dev/sda2
ceph osd crush add osd.<ID> 0 root=ssd host=g3-ssd

Ensuite, autoriser Ceph à mettre des data dessus:

$ /root/tools/ceph-reweight-osds.sh osd.<ID>

inconsistent pg

root@g1:~# ceph health detail
HEALTH_ERR 1 pgs inconsistent; 2 scrub errors
pg 58.22d is active+clean+inconsistent, acting [9,47,37]
2 scrub errors
root@g1:~# rados list-inconsistent-obj 58.22d  --format=json-pretty
{
    "epoch": 269000,
    "inconsistents": [
        {
            "object": {
                "name": "rbd_data.11f20f75aac8266.00000000000f79f9",
                "nspace": "",
                "locator": "",
                "snap": "head",
                "version": 9894452
            },
            "errors": [
                "data_digest_mismatch" 
            ],
            "union_shard_errors": [
                "data_digest_mismatch_oi" 
            ],
            "selected_object_info": 
"58:b453643a:::rbd_data.11f20f75aac8266.00000000000f79f9:head(261163'9281748 osd.9.0:6221608 dirty|data_digest|omap_digest s 4194304 uv 9894452 dd 2193d055 od ffffffff alloc_hint [0 0])",
            "shards": [
                {
                    "osd": 9,
                    "errors": [],
                    "size": 4194304,
                    "omap_digest": "0xffffffff",
                    "data_digest": "0x2193d055" 
                },
                {
                    "osd": 37,
                    "errors": [
                        "data_digest_mismatch_oi" 
                    ],
                    "size": 4194304,
                    "omap_digest": "0xffffffff",
                    "data_digest": "0x05891fb4" 
                },
                {
                    "osd": 47,
                    "errors": [],
                    "size": 4194304,
                    "omap_digest": "0xffffffff",
                    "data_digest": "0x2193d055" 
                }
            ]
        }
    ]
}
root@g1:~# ceph osd map disks rbd_data.11f20f75aac8266.00000000000f79f9
osdmap e269110 pool 'disks' (58) object 'rbd_data.11f20f75aac8266.00000000000f79f9' -> pg 58.5c26ca2d (58.22d) -> up ([9,47,37], p9) acting ([9,47,37], p9)

root@g8:/var/lib/ceph/osd/ceph-9/current/58.22d_head# find . -name '*11f20f75aac8266.00000000000f79f9*'
./DIR_D/DIR_2/DIR_A/DIR_C/rbd\udata.11f20f75aac8266.00000000000f79f9__head_5C26CA2D__3a

root@g10:/var/lib/ceph/osd/ceph-37/current/58.22d_head# find . -name '*11f20f75aac8266.00000000000f79f9*'
./DIR_D/DIR_2/DIR_A/DIR_C/rbd\udata.11f20f75aac8266.00000000000f79f9__head_5C26CA2D__3a

$ scp g8:/var/lib/ceph/osd/ceph-9/current/58.22d_head/DIR_D/DIR_2/DIR_A/DIR_C/rbd*data.11f20f75aac8266.00000000000f79f9__head_5C26CA2D__3a g8data
$ scp g10:/var/lib/ceph/osd/ceph-37/current/58.22d_head/DIR_D/DIR_2/DIR_A/DIR_C/rbd*data.11f20f75aac8266.00000000000f79f9__head_5C26CA2D__3a g10data

$ md5sum *
bd85c0ef1f30829ce07e5f9152ac2d2f  g10data
4297d0bc373e6603e0ad842702e0ecaa  g8data
$ $ diff -u <(od -x g10data) <(od -x g8data)
--- /dev/fd/63    2017-08-13 10:43:52.837097740 +0200
+++ /dev/fd/62    2017-08-13 10:43:52.833097808 +0200
@@ -2617,7 +2617,7 @@
 0121600 439b 14f4 bb4c 5f14 6ff7 4393 9ff8 a9a9
 0121620 29a8 56a4 1133 b6a8 2206 4821 2f42 4b2c
 0121640 3d86 41a2 785f 9785 8b48 4243 e7b9 f0aa
-0121660 29b6 be0c 0455 bf97 1c0d 49e5 75dd e1ed
+0121660 29a6 be0c 0455 bf97 1c0d 49e5 75dd e1ed
 0121700 2519 d6ac 1047 1111 0344 38be 27a1 db07
 0121720 dff6 c002 75d8 4396 6154 eba9 3abd 5d20
 0121740 8ae4 e63a 298b d754 0208 9705 1bb8 3685

Donc un seul bit flip 29b6 vs 29a6

>>> bin(0xa)
'0b1010'
>>> bin(0xb)
'0b1011'