🥇Ib qho piv txwv ntawm kev txuas Ceph-raws li cia rau Kubernetes pawg

Container Storage Interface (CSI) yog ib qho kev sib koom ua ke ntawm Kubernetes thiab cov tshuab khaws cia. Peb twb tau tham txog nws luv luv hais, thiab hnub no peb yuav los saib ze dua ntawm kev sib xyaw ntawm CSI thiab Ceph: peb yuav qhia li cas txuas Ceph cia mus rau Kubernetes pawg.
Cov kab lus muab qhov tseeb, txawm tias me ntsis yooj yim piv txwv rau kev nkag siab yooj yim. Peb tsis xav txog kev txhim kho thiab teeb tsa Ceph thiab Kubernetes pawg.

Koj puas xav tias nws ua haujlwm li cas?

Yog li, koj muaj Kubernetes pawg ntawm koj lub ntsis ntiv tes, xa mus, piv txwv li, kub. Muaj Ceph pawg ua haujlwm nyob ze - koj tuaj yeem nruab nws, piv txwv li, nrog qhov no ib txheej ntawm playbooks. Kuv vam tias tsis tas yuav hais tias rau kev tsim khoom ntawm lawv yuav tsum muaj lub network nrog bandwidth tsawg kawg 10 Gbit / s.

Yog tias koj muaj tag nrho cov no, cia peb mus!

Ua ntej, cia peb mus rau ib qho ntawm Ceph pawg nodes thiab xyuas tias txhua yam nyob rau hauv kev txiav txim:

ceph health
ceph -s

Tom ntej no, peb mam li tsim ib lub pas dej ua ke rau RBD disks:

ceph osd pool create kube 32
ceph osd pool application enable kube rbd

Cia peb mus rau Kubernetes pawg. Nyob ntawd, ua ntej ntawm tag nrho cov, peb yuav nruab Ceph CSI tsav tsheb rau RBD. Peb yuav nruab, raws li xav tau, los ntawm Helm.
Peb ntxiv ib lub chaw cia khoom nrog ib daim ntawv qhia, peb tau txais ib txheej ntawm qhov sib txawv rau daim ntawv ceph-csi-rbd:

helm repo add ceph-csi https://ceph.github.io/csi-charts
helm inspect values ceph-csi/ceph-csi-rbd > cephrbd.yml

Tam sim no koj yuav tsum sau cov ntaub ntawv cephrbd.yml. Txhawm rau ua qhov no, tshawb xyuas pawg ID thiab IP chaw nyob ntawm cov saib hauv Ceph:

ceph fsid  # так мы узнаем clusterID
ceph mon dump  # а так увидим IP-адреса мониторов

Peb nkag mus rau qhov tau txais txiaj ntsig rau hauv cov ntaub ntawv cephrbd.yml. Nyob rau tib lub sijhawm, peb pab kom tsim PSP cov cai (Pod Security Policy). Kev xaiv hauv ntu nodeplugin и tus muab twb nyob rau hauv cov ntaub ntawv, lawv tuaj yeem raug kho raws li qhia hauv qab no:

csiConfig:
  - clusterID: "bcd0d202-fba8-4352-b25d-75c89258d5ab"
    monitors:
      - "v2:172.18.8.5:3300/0,v1:172.18.8.5:6789/0"
      - "v2:172.18.8.6:3300/0,v1:172.18.8.6:6789/0"
      - "v2:172.18.8.7:3300/0,v1:172.18.8.7:6789/0"

nodeplugin:
  podSecurityPolicy:
    enabled: true

provisioner:
  podSecurityPolicy:
    enabled: true

Tom ntej no, txhua yam uas tseem tshuav rau peb yog txhawm rau txhim kho daim ntawv qhia hauv Kubernetes pawg.

helm upgrade -i ceph-csi-rbd ceph-csi/ceph-csi-rbd -f cephrbd.yml -n ceph-csi-rbd --create-namespace

Zoo heev, tus tsav tsheb RBD ua haujlwm!
Cia peb tsim StorageClass tshiab hauv Kubernetes. Qhov no dua yuav tsum tau me ntsis tinkering nrog Ceph.

Peb tsim ib tus neeg siv tshiab hauv Ceph thiab muab nws txoj cai sau rau hauv pas dej kub:

ceph auth get-or-create client.rbdkube mon 'profile rbd' osd 'profile rbd pool=kube'

Tam sim no cia peb pom tus yuam sij nkag tseem muaj:

ceph auth get-key client.rbdkube

Cov lus txib yuav tso tawm ib yam dab tsi zoo li no:

AQCO9NJbhYipKRAAMqZsnqqS/T8OYQX20xIa9A==

Cia peb ntxiv tus nqi no rau Secret hauv Kubernetes pawg - qhov twg peb xav tau userKey:

---
apiVersion: v1
kind: Secret
metadata:
  name: csi-rbd-secret
  namespace: ceph-csi-rbd
stringData:
  # Значения ключей соответствуют имени пользователя и его ключу, как указано в
  # кластере Ceph. ID юзера должен иметь доступ к пулу,
  # указанному в storage class
  userID: rbdkube
  userKey: <user-key>

Thiab peb tsim peb qhov zais cia:

kubectl apply -f secret.yaml

Tom ntej no, peb xav tau StorageClass manifest ib yam dab tsi zoo li no:

---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
   name: csi-rbd-sc
provisioner: rbd.csi.ceph.com
parameters:
   clusterID: <cluster-id>
   pool: kube

   imageFeatures: layering

   # Эти секреты должны содержать данные для авторизации
   # в ваш пул.
   csi.storage.k8s.io/provisioner-secret-name: csi-rbd-secret
   csi.storage.k8s.io/provisioner-secret-namespace: ceph-csi-rbd
   csi.storage.k8s.io/controller-expand-secret-name: csi-rbd-secret
   csi.storage.k8s.io/controller-expand-secret-namespace: ceph-csi-rbd
   csi.storage.k8s.io/node-stage-secret-name: csi-rbd-secret
   csi.storage.k8s.io/node-stage-secret-namespace: ceph-csi-rbd

   csi.storage.k8s.io/fstype: ext4

reclaimPolicy: Delete
allowVolumeExpansion: true
mountOptions:
  - discard

Yuav tsum tau ua kom tiav pawgID, uas peb twb tau kawm los ntawm pab neeg seb fsd, thiab siv qhov manifest no rau Kubernetes pawg:

kubectl apply -f storageclass.yaml

Txhawm rau xyuas seb cov pawg ua haujlwm li cas, cia peb tsim cov PVC hauv qab no (Persistent Volume Claim):

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: rbd-pvc
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
  storageClassName: csi-rbd-sc

Cia peb pom tam sim ntawd Kubernetes tsim qhov ntim thov hauv Ceph:

kubectl get pvc
kubectl get pv

Txhua yam zoo li zoo heev! Qhov no zoo li cas ntawm Ceph sab?
Peb tau txais cov npe ntawm cov ntim hauv pas dej thiab saib cov ntaub ntawv hais txog peb lub ntim:

rbd ls -p kube
rbd -p kube info csi-vol-eb3d257d-8c6c-11ea-bff5-6235e7640653  # тут, конечно же, будет другой ID тома, который выдала предыдущая команда

Tam sim no cia saib yuav ua li cas resizing ib RBD ntim ua haujlwm.
Hloov qhov ntim loj hauv pvc.yaml manifest rau 2Gi thiab siv nws:

kubectl apply -f pvc.yaml

Cia peb tos rau qhov kev hloov pauv kom muaj txiaj ntsig thiab saib lub ntim loj dua.

rbd -p kube info csi-vol-eb3d257d-8c6c-11ea-bff5-6235e7640653

kubectl get pv
kubectl get pvc

Peb pom tias qhov loj ntawm PVC tsis tau hloov. Yog xav paub vim li cas, koj tuaj yeem nug Kubernetes rau YAML cov lus piav qhia ntawm PVC:

kubectl get pvc rbd-pvc -o yaml

Nov yog qhov teeb meem:

lus: Tos rau tus neeg siv kom (re-) pib lub pod kom tiav cov ntaub ntawv kaw lus resize ntawm ntim ntawm node. hom: FileSystemResizePending

Ntawd yog, lub disk tau loj hlob, tab sis cov ntaub ntawv kaw lus ntawm nws tsis tau.
Yuav kom loj hlob cov ntaub ntawv system, koj yuav tsum tau mount lub ntim. Nyob rau hauv peb lub teb chaws, cov tsim PVC / PV tam sim no tsis siv nyob rau hauv txhua txoj kev.

Peb tuaj yeem tsim Pod xeem, piv txwv li no:

---
apiVersion: v1
kind: Pod
metadata:
  name: csi-rbd-demo-pod
spec:
  containers:
    - name: web-server
      image: nginx:1.17.6
      volumeMounts:
        - name: mypvc
          mountPath: /data
  volumes:
    - name: mypvc
      persistentVolumeClaim:
        claimName: rbd-pvc
        readOnly: false

Thiab tam sim no cia saib PVC:

kubectl get pvc

Qhov loj me tau hloov, txhua yam zoo.

Hauv thawj ntu, peb tau ua haujlwm nrog RBD thaiv cov cuab yeej (nws sawv cev rau Rados Block Device), tab sis qhov no tsis tuaj yeem ua tiav yog tias cov microservices sib txawv yuav tsum ua haujlwm nrog cov disk no ib txhij. CephFS yog qhov zoo dua rau kev ua haujlwm nrog cov ntaub ntawv ntau dua li cov duab disk.
Siv cov piv txwv ntawm Ceph thiab Kubernetes pawg, peb yuav teeb tsa CSI thiab lwm qhov chaw tsim nyog los ua haujlwm nrog CephFS.

Cia peb tau txais cov txiaj ntsig los ntawm daim ntawv qhia Helm tshiab peb xav tau:

helm inspect values ceph-csi/ceph-csi-cephfs > cephfs.yml

Ib zaug ntxiv koj yuav tsum sau cov ntaub ntawv cephfs.yml. Raws li ua ntej, Ceph cov lus txib yuav pab:

ceph fsid
ceph mon dump

Sau cov ntaub ntawv nrog cov txiaj ntsig zoo li no:

csiConfig:
  - clusterID: "bcd0d202-fba8-4352-b25d-75c89258d5ab"
    monitors:
      - "172.18.8.5:6789"
      - "172.18.8.6:6789"
      - "172.18.8.7:6789"

nodeplugin:
  httpMetrics:
    enabled: true
    containerPort: 8091
  podSecurityPolicy:
    enabled: true

provisioner:
  replicaCount: 1
  podSecurityPolicy:
    enabled: true

Thov nco ntsoov tias cov chaw nyob saib xyuas tau teev nyob rau hauv daim ntawv yooj yim chaw nyob: chaw nres nkoj. Txhawm rau mount cephfs ntawm ib lub ntawm, cov chaw nyob no raug xa mus rau lub ntsiav module, uas tseem tsis tau paub ua haujlwm nrog v2 saib raws tu qauv.
Peb hloov qhov chaw nres nkoj rau httpMetrics (Prometheus yuav mus rau qhov ntsuas ntsuas) kom nws tsis cuam tshuam nrog nginx-proxy, uas tau teeb tsa los ntawm Kubespray. Tej zaum koj yuav tsis xav tau qhov no.

Nruab daim ntawv Helm hauv Kubernetes pawg:

helm upgrade -i ceph-csi-cephfs ceph-csi/ceph-csi-cephfs -f cephfs.yml -n ceph-csi-cephfs --create-namespace

Cia peb mus rau Ceph cov ntaub ntawv khaws cia los tsim ib tus neeg siv cais nyob ntawd. Cov ntaub ntawv hais tias CephFS tus neeg muab kev pabcuam yuav tsum muaj cai nkag mus rau pawg thawj tswj hwm. Tab sis peb yuav tsim ib tus neeg siv cais fs nrog txwv txoj cai:

ceph auth get-or-create client.fs mon 'allow r' mgr 'allow rw' mds 'allow rws' osd 'allow rw pool=cephfs_data, allow rw pool=cephfs_metadata'

Thiab tam sim ntawd saib nws tus yuam sij nkag, peb yuav xav tau nws tom qab:

ceph auth get-key client.fs

Cia peb tsim cais Secret thiab StorageClass.
Tsis muaj dab tsi tshiab, peb twb pom qhov no hauv qhov piv txwv ntawm RBD:

---
apiVersion: v1
kind: Secret
metadata:
  name: csi-cephfs-secret
  namespace: ceph-csi-cephfs
stringData:
  # Необходимо для динамически создаваемых томов
  adminID: fs
  adminKey: <вывод предыдущей команды>

Siv lub manifest:

kubectl apply -f secret.yaml

Thiab tam sim no - cais StorageClass:

---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: csi-cephfs-sc
provisioner: cephfs.csi.ceph.com
parameters:
  clusterID: <cluster-id>

  # Имя файловой системы CephFS, в которой будет создан том
  fsName: cephfs

  # (необязательно) Пул Ceph, в котором будут храниться данные тома
  # pool: cephfs_data

  # (необязательно) Разделенные запятыми опции монтирования для Ceph-fuse
  # например:
  # fuseMountOptions: debug

  # (необязательно) Разделенные запятыми опции монтирования CephFS для ядра
  # См. man mount.ceph чтобы узнать список этих опций. Например:
  # kernelMountOptions: readdir_max_bytes=1048576,norbytes

  # Секреты должны содержать доступы для админа и/или юзера Ceph.
  csi.storage.k8s.io/provisioner-secret-name: csi-cephfs-secret
  csi.storage.k8s.io/provisioner-secret-namespace: ceph-csi-cephfs
  csi.storage.k8s.io/controller-expand-secret-name: csi-cephfs-secret
  csi.storage.k8s.io/controller-expand-secret-namespace: ceph-csi-cephfs
  csi.storage.k8s.io/node-stage-secret-name: csi-cephfs-secret
  csi.storage.k8s.io/node-stage-secret-namespace: ceph-csi-cephfs

  # (необязательно) Драйвер может использовать либо ceph-fuse (fuse), 
  # либо ceph kernelclient (kernel).
  # Если не указано, будет использоваться монтирование томов по умолчанию,
  # это определяется поиском ceph-fuse и mount.ceph
  # mounter: kernel
reclaimPolicy: Delete
allowVolumeExpansion: true
mountOptions:
  - debug

Wb sau rau ntawm no pawgID thiab siv tau hauv Kubernetes:

kubectl apply -f storageclass.yaml

soj ntsuam

Txhawm rau txheeb xyuas, zoo li hauv qhov piv txwv dhau los, cia peb tsim PVC:

---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: csi-cephfs-pvc
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 5Gi
  storageClassName: csi-cephfs-sc

Thiab xyuas qhov muaj ntawm PVC / PV:

kubectl get pvc
kubectl get pv

Yog tias koj xav saib cov ntaub ntawv thiab cov npe hauv CephFS, koj tuaj yeem txuas cov ntaub ntawv no rau qhov chaw. Piv txwv li qhia hauv qab no.

Cia wb mus rau ib qho ntawm Ceph pawg nodes thiab ua cov haujlwm hauv qab no:

# Точка монтирования
mkdir -p /mnt/cephfs

# Создаём файл с ключом администратора
ceph auth get-key client.admin >/etc/ceph/secret.key

# Добавляем запись в /etc/fstab
# !! Изменяем ip адрес на адрес нашего узла
echo "172.18.8.6:6789:/ /mnt/cephfs ceph name=admin,secretfile=/etc/ceph/secret.key,noatime,_netdev    0       2" >> /etc/fstab

mount /mnt/cephfs

Tau kawg, mounting FS ntawm Ceph node zoo li qhov no tsuas yog tsim nyog rau kev cob qhia, uas yog qhov peb ua ntawm peb. Cov chav kawm Slurm. Kuv tsis xav tias leej twg yuav ua qhov no hauv kev tsim khoom; muaj kev pheej hmoo siab ua yuam kev tshem tawm cov ntaub ntawv tseem ceeb.

Thiab thaum kawg, cia peb xyuas seb cov khoom ua haujlwm li cas nrog kev hloov pauv ntim hauv rooj plaub ntawm CephFS. Cia peb rov qab mus rau Kubernetes thiab kho peb cov manifest rau PVC - nce qhov loj nyob ntawd, piv txwv li, rau 7Gi.

Cia peb siv cov ntaub ntawv edited:

kubectl apply -f pvc.yaml

Cia peb saib ntawm cov npe mounted kom pom tias cov quota tau hloov pauv li cas:

getfattr -n ceph.quota.max_bytes <каталог-с-данными>

Rau cov lus txib no ua haujlwm, koj yuav tsum tau nruab lub pob ntawm koj lub cev attr.

Qhov muag ntshai, tab sis txhais tes ua

Tag nrho cov kev sau ntawv no thiab ntev YAML manifests zoo li nyuaj rau saum npoo, tab sis hauv kev xyaum, Slurm cov tub ntxhais kawm tau txais qhov dai ntawm lawv sai sai.
Hauv tsab xov xwm no peb tsis tau mus tob rau hauv hav zoov - muaj cov ntaub ntawv raug cai rau qhov ntawd. Yog tias koj txaus siab rau cov ntsiab lus ntawm kev teeb tsa Ceph cia nrog Kubernetes pawg, cov kev txuas no yuav pab tau:

Cov ntsiab cai dav dav ntawm Kubernetes ua haujlwm nrog ntim
RBD Cov ntaub ntawv
Kev koom ua ke RBD thiab Kubernetes los ntawm Ceph foundations
Kev koom ua ke RBD thiab Kubernetes los ntawm CSI foundations
General CephFS Cov Ntaub Ntawv
Kev koom ua ke CephFS thiab Kubernetes los ntawm CSI qhov kev xav

Hauv chav kawm Slurm Kubernetes Base koj tuaj yeem mus ntxiv me ntsis thiab xa daim ntawv thov tiag tiag hauv Kubernetes uas yuav siv CephFS ua cov ntaub ntawv khaws cia. Los ntawm GET / POST thov koj tuaj yeem hloov cov ntaub ntawv mus rau thiab tau txais los ntawm Ceph.

Thiab yog tias koj xav paub ntau ntxiv hauv cov ntaub ntawv khaws cia, ces sau npe rau chav kawm tshiab ntawm Ceph. Thaum qhov kev sim beta tseem tab tom ua, chav kawm tuaj yeem tau txais ntawm luv nqi thiab koj tuaj yeem cuam tshuam nws cov ntsiab lus.

Tus sau ntawm tsab xov xwm: Alexander Shvalov, xyaum engineer sab qab teb choj, Certified Kubernetes Administrator, sau thiab tsim tawm ntawm Slurm cov chav kawm.

Tau qhov twg los: www.hab.com

Ib qho piv txwv ntawm kev sib txuas Ceph-raws li cia rau Kubernetes pawg

soj ntsuam

Qhov muag ntshai, tab sis txhais tes ua