Kubernetes – запуск stolon

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Stolon -это кластер для postgresql с автофайловером, похож на patrony. - будем запускать это в кубере.

ЛЮБАЯ БАЗА ДАННЫХ В КОНТЕЙНЕРЕ - ЭТО ЗЛО.

Ставить будем через Helm.

[root@minikub ~]# mkdir stolon
[root@minikub ~]# cd stolon/

Для начала выкачиваем архив:

helm fetch stable/stolon

распаковываем:

[root@minikub stolon]# tar xvfz stolon-1.6.1.tgz

создаём namespace postgres в нём будем запускать наш кластер stolon

[root@minikub stolon]# kubectl create namespace postgres

создадим secret-ы для суперпользователя:

kubectl create secret generic <strong>pg-su</strong> --namespace postgres --from-literal<span class="token operator">=</span>username<span class="token operator">=</span><span class="token string">'MY_USER'</span> --from-literal<span class="token operator">=</span>password<span class="token operator">=</span><span class="token string">'MY_PASSWORD'</span>

kubectl create secret generic pg-su --namespace postgres --from-literal=username='MY_USER' --from-literal=password='MY_PASSWORD'

для репликации:

kubectl create secret generic <strong>pg-repl</strong> --namespace postgres --from-literal<span class="token operator">=</span>username<span class="token operator">=</span><span class="token string">'repl_username'</span> --from-literal<span class="token operator">=</span>password<span class="token operator">=</span><span class="token string">'repl_password'</span>

kubectl create secret generic pg-repl --namespace postgres --from-literal=username='repl_username' --from-literal=password='repl_password'

теперь правим файл с переменными:

/root/stolon/stolon/values.yaml

для суперпользователя:

[codesyntax lang="php"]

superuserSecret:
  name: pg-su
  usernameKey: username
  passwordKey: password

superuserSecret:

usernameKey: username

passwordKey: password

[/codesyntax]

2. для репликации:

[codesyntax lang="php"]

replicationSecret:
  name: pg-repl
  usernameKey: username
  passwordKey: password

replicationSecret:

usernameKey: username

passwordKey: password

[/codesyntax]

3. удаляем не нужное:

[codesyntax lang="php"]

superuserUsername: "stolon"
## password for the superuser (REQUIRED if superuserSecret is not set)
superuserPassword:

replicationUsername: "repluser"
## password for the replication user (REQUIRED if replicationSecret is not set)
replicationPassword:

superuserUsername: "stolon"

## password for the superuser (REQUIRED if superuserSecret is not set)

superuserPassword:

replicationUsername: "repluser"

## password for the replication user (REQUIRED if replicationSecret is not set)

replicationPassword:

[/codesyntax]

4. меняем с

[codesyntax lang="php"]

clusterSpec: {}
  # sleepInterval: 1s
  # maxStandbys: 5

clusterSpec: {}

# sleepInterval: 1s

# maxStandbys: 5

[/codesyntax]

на

[codesyntax lang="php"]

clusterSpec:
  synchronousReplication: true
  minSynchronousStandbys: 1 # quorum-like replication
  maxSynchronousStandbys: 1 # quorum-like replication
  initMode: new

clusterSpec:

synchronousReplication: true

minSynchronousStandbys: 1 # quorum-like replication

maxSynchronousStandbys: 1 # quorum-like replication

initMode: new

[/codesyntax]

5. отключение пакета:

[codesyntax lang="php"]

podDisruptionBudget:
  minAvailable: 2

1 2	podDisruptionBudget: minAvailable: 2

[/codesyntax]

6. Настройте pgParameters и установите количество реплик равным 3 (всего 3 экземпляра: 1 мастер, 1 резервный синхронизатор и 1 резервный асинхронный):

[codesyntax lang="php"]

pgParameters:
  max_connections: 100
# ...
keeper:
  # ...
  replicaCount: 3
# ...
proxy:
  # ...
  replicaCount: 3
# ...
sentinel:
  # ...
  replicaCount: 3

pgParameters:

max_connections: 100

# …

keeper:

# …

replicaCount: 3

# …

proxy:

# …

replicaCount: 3

# …

sentinel:

# …

replicaCount: 3

[/codesyntax]

7. Можно ещё настроить аннотации обнаружения сервиса для Prometheus, но я этого делать не стал.

[codesyntax lang="php"]

annotations:
  prometheus.io/scrape: "true"
  prometheus.io/port: "8080"

annotations:

prometheus.io/scrape: "true"

prometheus.io/port: "8080"

[/codesyntax]

8. можно оставить всё как есть но у меня данные хранятся на nfs поэтому поправим ещё сторедж класс

[codesyntax lang="php"]

persistence:
  enabled: true
  storageClassName: "managed-nfs-storage"
  accessModes:
    - ReadWriteOnce
  size: 10Gi

persistence:

enabled: true

storageClassName: "managed-nfs-storage"

accessModes:

- ReadWriteOnce

size: 10Gi

[/codesyntax]

managed-nfs-storage - берём отсюда:

[codesyntax lang="php"]

[root@minikub stolon]# kubectl get storageclasses.storage.k8s.io
NAME                  PROVISIONER                RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
managed-nfs-storage   test.ru/nfs                Retain          Immediate           false                  39h
standard (default)    k8s.io/minikube-hostpath   Delete          Immediate           false                  185d

[root@minikub stolon]# kubectl get storageclasses.storage.k8s.io

NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE

managed-nfs-storage test.ru/nfs Retain Immediate false 39h

standard (default) k8s.io/minikube-hostpath Delete Immediate false 185d

[/codesyntax]

всё, теперь файл values.yaml будет иметь вид:

[codesyntax lang="php"]

[root@minikub stolon]# cat /root/stolon/stolon/values.yaml
# clusterName:
image:
  repository: sorintlab/stolon
  tag: v0.16.0-pg10
  pullPolicy: IfNotPresent
  ## Add secrets manually via kubectl on kubernetes cluster and reference here
  # pullSecrets:
  #   - name: "myKubernetesSecret"

# used by create-cluster-job when store.backend is etcd
etcdImage:
  repository: k8s.gcr.io/etcd-amd64
  tag: 2.3.7
  pullPolicy: IfNotPresent

debug: false

# Enable the creation of a shm volume
shmVolume:
  enabled: false

persistence:
  enabled: true
  ## If defined, storageClassName: &lt;storageClass&gt;
  ## If set to "-", storageClassName: "", which disables dynamic provisioning
  ## If undefined (the default) or set to null, no storageClassName spec is
  ##   set, choosing the default provisioner.  (gp2 on AWS, standard on
  ##   GKE, AWS &amp; OpenStack)
  ##
  storageClassName: "managed-nfs-storage"
  accessModes:
    - ReadWriteOnce
  size: 10Gi

rbac:
  create: true

serviceAccount:
  create: true
  # The name of the ServiceAccount to use. If not set and create is true, a name is generated using the fullname template
  name:

superuserSecret:
  name: "pg-su"
  usernameKey: username
  passwordKey: password

replicationSecret:
  name: "pg-repl"
  usernameKey: username
  passwordKey: password

superuserPasswordFile:

#superuserUsername: "stolon"
## password for the superuser (REQUIRED if superuserSecret and superuserPasswordFile are not set)
#superuserPassword:

#replicationPasswordFile:

#replicationUsername: "repluser"
## password for the replication user (REQUIRED if replicationSecret and replicationPasswordFile are not set)
#replicationPassword:

## backend could be one of the following: consul, etcdv2, etcdv3 or kubernetes
store:
  backend: kubernetes
#  endpoints: "http://stolon-consul:8500"
  kubeResourceKind: configmap

pgParameters:
  max_connections: "100"

ports:
  stolon:
    containerPort: 5432
  metrics:
    containerPort: 8080

serviceMonitor:
  # When set to true then use a ServiceMonitor to collect metrics
  enabled: false
  # Custom labels to use in the ServiceMonitor to be matched with a specific Prometheus
  labels: {}
  # Set the namespace the ServiceMonitor should be deployed to
  # namespace: default
  # Set how frequently Prometheus should scrape
  # interval: 30s
  # Set timeout for scrape
  # scrapeTimeout: 10s

job:
  autoCreateCluster: true
  autoUpdateClusterSpec: true
  annotations: {}

clusterSpec:
  # sleepInterval: 1s
  # maxStandbys: 5
  synchronousReplication: true
  minSynchronousStandbys: 1 # quorum-like replication
  maxSynchronousStandbys: 1 # quorum-like replication
  initMode: new

## Enable support ssl into postgres, you must specify the certs.
## ref: https://www.postgresql.org/docs/10/ssl-tcp.html
##
tls:
  enabled: false
  rootCa: |-
  serverCrt: |-
  serverKey: |-

  # existingSecret: name-of-existing-secret-to-postgresql

keeper:
  uid_prefix: "keeper"
  replicaCount: 3
  annotations: {}
  resources: {}
  priorityClassName: ""
  fsGroup: ""
  service:
    type: ClusterIP
    annotations: {}
    ports:
      keeper:
        port: 5432
        targetPort: 5432
        protocol: TCP
  nodeSelector: {}
  affinity: {}
  tolerations: []
  volumes: []
  volumeMounts: []
  hooks:
    failKeeper:
      enabled: false
  podDisruptionBudget:
    minAvailable: 2
    # maxUnavailable: 1
  extraEnv: []
  #  - name: STKEEPER_LOG_LEVEL
  #    value: "info"

proxy:
  replicaCount: 3
  annotations: {}
  resources: {}
  priorityClassName: ""
  service:
    type: ClusterIP
#    loadBalancerIP: ""
    annotations: {}
    ports:
      proxy:
        port: 5432
        targetPort: 5432
        protocol: TCP
  nodeSelector: {}
  affinity: {}
  tolerations: []
  podDisruptionBudget:
    # minAvailable: 1
    # maxUnavailable: 1
  extraEnv: []
  #  - name: STPROXY_LOG_LEVEL
  #    value: "info"
  #  - name: STPROXY_TCP_KEEPALIVE_COUNT
  #    value: "0"
  #  - name: STPROXY_TCP_KEEPALIVE_IDLE
  #    value: "0"
  #  - name: STPROXY_TCP_KEEPALIVE_INTERVAL
  #    value: "0"

sentinel:
  replicaCount: 3
  annotations: {}
  resources: {}
  priorityClassName: ""
  nodeSelector: {}
  affinity: {}
  tolerations: []
  podDisruptionBudget:
    # minAvailable: 1
    # maxUnavailable: 1
  extraEnv: []
  #  - name: STSENTINEL_LOG_LEVEL
  #    value: "info"

## initdb scripts
## Specify dictionary of scripts to be run at first boot, the entry point script is create_script.sh
## i.e. you can use pgsql to run sql script on the cluster.
##
# initdbScripts:
#   create_script.sh: |
#      #!/bin/sh
#      echo "Do something."

## nodePostStart scripts
## Specify dictionary of scripts to be run at first boot, the entry point script is postStartScript.sh
## i.e. you can create tablespace directory here.
##
# nodePostStartScript:
#  postStartScript.sh: |
#    #!/bin/bash
#     echo "Do something."

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[root@minikub stolon]# cat /root/stolon/stolon/values.yaml

# clusterName:

image:

repository: sorintlab/stolon

tag: v0.16.0-pg10

pullPolicy: IfNotPresent

## Add secrets manually via kubectl on kubernetes cluster and reference here

# pullSecrets:

# - name: "myKubernetesSecret"

# used by create-cluster-job when store.backend is etcd

etcdImage:

repository: k8s.gcr.io/etcd-amd64

tag: 2.3.7

pullPolicy: IfNotPresent

debug: false

# Enable the creation of a shm volume

shmVolume:

enabled: false

persistence:

enabled: true

## If defined, storageClassName: <storageClass>

## If set to "-", storageClassName: "", which disables dynamic provisioning

## If undefined (the default) or set to null, no storageClassName spec is

## set, choosing the default provisioner. (gp2 on AWS, standard on

## GKE, AWS & OpenStack)

storageClassName: "managed-nfs-storage"

accessModes:

- ReadWriteOnce

size: 10Gi

rbac:

create: true

serviceAccount:

create: true

# The name of the ServiceAccount to use. If not set and create is true, a name is generated using the fullname template

name:

superuserSecret:

usernameKey: username

passwordKey: password

replicationSecret:

usernameKey: username

passwordKey: password

superuserPasswordFile:

#superuserUsername: "stolon"

## password for the superuser (REQUIRED if superuserSecret and superuserPasswordFile are not set)

#superuserPassword:

#replicationPasswordFile:

#replicationUsername: "repluser"

## password for the replication user (REQUIRED if replicationSecret and replicationPasswordFile are not set)

#replicationPassword:

## backend could be one of the following: consul, etcdv2, etcdv3 or kubernetes

store:

backend: kubernetes

# endpoints: "http://stolon-consul:8500"

kubeResourceKind: configmap

pgParameters:

max_connections: "100"

ports:

stolon:

containerPort: 5432

metrics:

containerPort: 8080

serviceMonitor:

# When set to true then use a ServiceMonitor to collect metrics

enabled: false

# Custom labels to use in the ServiceMonitor to be matched with a specific Prometheus

labels: {}

# Set the namespace the ServiceMonitor should be deployed to

# namespace: default

# Set how frequently Prometheus should scrape

# interval: 30s

# Set timeout for scrape

# scrapeTimeout: 10s

job:

autoCreateCluster: true

autoUpdateClusterSpec: true

annotations: {}

clusterSpec:

# sleepInterval: 1s

# maxStandbys: 5

synchronousReplication: true

minSynchronousStandbys: 1 # quorum-like replication

maxSynchronousStandbys: 1 # quorum-like replication

initMode: new

## Enable support ssl into postgres, you must specify the certs.

## ref: https://www.postgresql.org/docs/10/ssl-tcp.html

tls:

enabled: false

rootCa: |-

serverCrt: |-

serverKey: |-

# existingSecret: name-of-existing-secret-to-postgresql

keeper:

uid_prefix: "keeper"

replicaCount: 3

annotations: {}

resources: {}

priorityClassName: ""

fsGroup: ""

service:

type: ClusterIP

annotations: {}

ports:

keeper:

port: 5432

targetPort: 5432

protocol: TCP

nodeSelector: {}

affinity: {}

tolerations: []

volumes: []

volumeMounts: []

hooks:

failKeeper:

enabled: false

podDisruptionBudget:

minAvailable: 2

# maxUnavailable: 1

extraEnv: []

# - name: STKEEPER_LOG_LEVEL

# value: "info"

proxy:

replicaCount: 3

annotations: {}

resources: {}

priorityClassName: ""

service:

type: ClusterIP

# loadBalancerIP: ""

annotations: {}

ports:

proxy:

port: 5432

targetPort: 5432

protocol: TCP

nodeSelector: {}

affinity: {}

tolerations: []

podDisruptionBudget:

# minAvailable: 1

# maxUnavailable: 1

extraEnv: []

# - name: STPROXY_LOG_LEVEL

# value: "info"

# - name: STPROXY_TCP_KEEPALIVE_COUNT

# value: "0"

# - name: STPROXY_TCP_KEEPALIVE_IDLE

# value: "0"

# - name: STPROXY_TCP_KEEPALIVE_INTERVAL

# value: "0"

sentinel:

replicaCount: 3

annotations: {}

resources: {}

priorityClassName: ""

nodeSelector: {}

affinity: {}

tolerations: []

podDisruptionBudget:

# minAvailable: 1

# maxUnavailable: 1

extraEnv: []

# - name: STSENTINEL_LOG_LEVEL

# value: "info"

## initdb scripts

## Specify dictionary of scripts to be run at first boot, the entry point script is create_script.sh

## i.e. you can use pgsql to run sql script on the cluster.

# initdbScripts:

# create_script.sh: |

# #!/bin/sh

# echo "Do something."

## nodePostStart scripts

## Specify dictionary of scripts to be run at first boot, the entry point script is postStartScript.sh

## i.e. you can create tablespace directory here.

# nodePostStartScript:

# postStartScript.sh: |

# #!/bin/bash

# echo "Do something."

[/codesyntax]

запускаем установку:

[root@minikub stolon]# helm install stolon-pg --namespace postgres /root/stolon/stolon/ --values /root/stolon/stolon/values.yaml

нормальный вывод следующий:

[codesyntax lang="php"]

NAME: stolon-pg
LAST DEPLOYED: Fri Oct  2 12:07:56 2020
NAMESPACE: postgres
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
Stolon cluster installed and initialized.


To get superuser password run

    PGPASSWORD=$(kubectl get secret --namespace postgres pg-su -o jsonpath="{.data.password}" | base64 --decode; echo)

NAME: stolon-pg

LAST DEPLOYED: Fri Oct 2 12:07:56 2020

NAMESPACE: postgres

STATUS: deployed

REVISION: 1

TEST SUITE: None

NOTES:

Stolon cluster installed and initialized.

To get superuser password run

PGPASSWORD=$(kubectl get secret --namespace postgres pg-su -o jsonpath="{.data.password}" | base64 --decode; echo)

[/codesyntax]

проверим корректно ли пароль вытаскивается:

[root@minikub stolon]# kubectl get secret --namespace postgres pg-su -o jsonpath="{.data.password}" | base64 --decode; echo
MY_PASSWORD

как видим пароль тот который мы задали.

Проверяем:
Диски созданы:

[codesyntax lang="php"]

[root@minikub stolon]# kubectl get pvc
No resources found.
[root@minikub stolon]# kubectl get pvc -n postgres
NAME                      STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS          AGE
data-stolon-pg-keeper-0   Bound    pvc-43fc5a5d-e203-4ebd-bb68-e40738780dc5   10Gi       RWO            managed-nfs-storage   12m
data-stolon-pg-keeper-1   Bound    pvc-6602d824-b3c3-4df8-b7fa-cc49b3d62c17   10Gi       RWO            managed-nfs-storage   12m
data-stolon-pg-keeper-2   Bound    pvc-dcb8ea84-651d-4f1a-8032-a67409fba5c7   10Gi       RWO            managed-nfs-storage   12m


[root@minikub stolon]# kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                              STORAGECLASS          REASON   AGE
pvc-43fc5a5d-e203-4ebd-bb68-e40738780dc5   10Gi       RWO            Retain           Bound    postgres/data-stolon-pg-keeper-0   managed-nfs-storage            12m
pvc-6602d824-b3c3-4df8-b7fa-cc49b3d62c17   10Gi       RWO            Retain           Bound    postgres/data-stolon-pg-keeper-1   managed-nfs-storage            12m
pvc-dcb8ea84-651d-4f1a-8032-a67409fba5c7   10Gi       RWO            Retain           Bound    postgres/data-stolon-pg-keeper-2   managed-nfs-storage            12m

[root@minikub stolon]# kubectl get pvc

No resources found.

[root@minikub stolon]# kubectl get pvc -n postgres

NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE

data-stolon-pg-keeper-0 Bound pvc-43fc5a5d-e203-4ebd-bb68-e40738780dc5 10Gi RWO managed-nfs-storage 12m

data-stolon-pg-keeper-1 Bound pvc-6602d824-b3c3-4df8-b7fa-cc49b3d62c17 10Gi RWO managed-nfs-storage 12m

data-stolon-pg-keeper-2 Bound pvc-dcb8ea84-651d-4f1a-8032-a67409fba5c7 10Gi RWO managed-nfs-storage 12m

[root@minikub stolon]# kubectl get pv

NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE

pvc-43fc5a5d-e203-4ebd-bb68-e40738780dc5 10Gi RWO Retain Bound postgres/data-stolon-pg-keeper-0 managed-nfs-storage 12m

pvc-6602d824-b3c3-4df8-b7fa-cc49b3d62c17 10Gi RWO Retain Bound postgres/data-stolon-pg-keeper-1 managed-nfs-storage 12m

pvc-dcb8ea84-651d-4f1a-8032-a67409fba5c7 10Gi RWO Retain Bound postgres/data-stolon-pg-keeper-2 managed-nfs-storage 12m

[/codesyntax]

поды так же все создались:

[codesyntax lang="php"]

[root@minikub stolon]# kubectl get deployments.apps -n postgres
NAME                 READY   UP-TO-DATE   AVAILABLE   AGE
stolon-pg-proxy      3/3     3            3           14m
stolon-pg-sentinel   3/3     3            3           14m
[root@minikub stolon]# kubectl get pod -n postgres
NAME                                  READY   STATUS      RESTARTS   AGE
stolon-pg-create-cluster-lgdlq        0/1     Completed   0          14m
stolon-pg-keeper-0                    1/1     Running     0          14m
stolon-pg-keeper-1                    1/1     Running     0          14m
stolon-pg-keeper-2                    1/1     Running     0          14m
stolon-pg-proxy-8458f44864-9hftr      1/1     Running     0          14m
stolon-pg-proxy-8458f44864-9l4jw      1/1     Running     0          14m
stolon-pg-proxy-8458f44864-kzqs4      1/1     Running     0          14m
stolon-pg-sentinel-59f9df4676-6dr9s   1/1     Running     0          14m
stolon-pg-sentinel-59f9df4676-jj94w   1/1     Running     0          14m
stolon-pg-sentinel-59f9df4676-vdct7   1/1     Running     0          14m

[root@minikub stolon]# kubectl get deployments.apps -n postgres

NAME READY UP-TO-DATE AVAILABLE AGE

stolon-pg-proxy 3/3 3 3 14m

stolon-pg-sentinel 3/3 3 3 14m

[root@minikub stolon]# kubectl get pod -n postgres

NAME READY STATUS RESTARTS AGE

stolon-pg-create-cluster-lgdlq 0/1 Completed 0 14m

stolon-pg-keeper-0 1/1 Running 0 14m

stolon-pg-keeper-1 1/1 Running 0 14m

stolon-pg-keeper-2 1/1 Running 0 14m

stolon-pg-proxy-8458f44864-9hftr 1/1 Running 0 14m

stolon-pg-proxy-8458f44864-9l4jw 1/1 Running 0 14m

stolon-pg-proxy-8458f44864-kzqs4 1/1 Running 0 14m

stolon-pg-sentinel-59f9df4676-6dr9s 1/1 Running 0 14m

stolon-pg-sentinel-59f9df4676-jj94w 1/1 Running 0 14m

stolon-pg-sentinel-59f9df4676-vdct7 1/1 Running 0 14m

[/codesyntax]

общая информация:

[codesyntax lang="php"]

[root@minikub stolon]# kubectl -n postgres get all
NAME                                      READY   STATUS      RESTARTS   AGE
pod/stolon-pg-create-cluster-lgdlq        0/1     Completed   0          14m
pod/stolon-pg-keeper-0                    1/1     Running     0          14m
pod/stolon-pg-keeper-1                    1/1     Running     0          14m
pod/stolon-pg-keeper-2                    1/1     Running     0          14m
pod/stolon-pg-proxy-8458f44864-9hftr      1/1     Running     0          14m
pod/stolon-pg-proxy-8458f44864-9l4jw      1/1     Running     0          14m
pod/stolon-pg-proxy-8458f44864-kzqs4      1/1     Running     0          14m
pod/stolon-pg-sentinel-59f9df4676-6dr9s   1/1     Running     0          14m
pod/stolon-pg-sentinel-59f9df4676-jj94w   1/1     Running     0          14m
pod/stolon-pg-sentinel-59f9df4676-vdct7   1/1     Running     0          14m

NAME                                TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
service/stolon-pg-keeper-headless   ClusterIP   None           &lt;none&gt;        5432/TCP   14m
service/stolon-pg-proxy             ClusterIP   10.103.26.10   &lt;none&gt;        5432/TCP   14m

NAME                                 READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/stolon-pg-proxy      3/3     3            3           14m
deployment.apps/stolon-pg-sentinel   3/3     3            3           14m

NAME                                            DESIRED   CURRENT   READY   AGE
replicaset.apps/stolon-pg-proxy-8458f44864      3         3         3       14m
replicaset.apps/stolon-pg-sentinel-59f9df4676   3         3         3       14m

NAME                                READY   AGE
statefulset.apps/stolon-pg-keeper   3/3     14m

NAME                                 COMPLETIONS   DURATION   AGE
job.batch/stolon-pg-create-cluster   1/1           5s         14m

[root@minikub stolon]# kubectl -n postgres get all

NAME READY STATUS RESTARTS AGE

pod/stolon-pg-create-cluster-lgdlq 0/1 Completed 0 14m

pod/stolon-pg-keeper-0 1/1 Running 0 14m

pod/stolon-pg-keeper-1 1/1 Running 0 14m

pod/stolon-pg-keeper-2 1/1 Running 0 14m

pod/stolon-pg-proxy-8458f44864-9hftr 1/1 Running 0 14m

pod/stolon-pg-proxy-8458f44864-9l4jw 1/1 Running 0 14m

pod/stolon-pg-proxy-8458f44864-kzqs4 1/1 Running 0 14m

pod/stolon-pg-sentinel-59f9df4676-6dr9s 1/1 Running 0 14m

pod/stolon-pg-sentinel-59f9df4676-jj94w 1/1 Running 0 14m

pod/stolon-pg-sentinel-59f9df4676-vdct7 1/1 Running 0 14m

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE

service/stolon-pg-keeper-headless ClusterIP None <none> 5432/TCP 14m

service/stolon-pg-proxy ClusterIP 10.103.26.10 <none> 5432/TCP 14m

NAME READY UP-TO-DATE AVAILABLE AGE

deployment.apps/stolon-pg-proxy 3/3 3 3 14m

deployment.apps/stolon-pg-sentinel 3/3 3 3 14m

NAME DESIRED CURRENT READY AGE

replicaset.apps/stolon-pg-proxy-8458f44864 3 3 3 14m

replicaset.apps/stolon-pg-sentinel-59f9df4676 3 3 3 14m

NAME READY AGE

statefulset.apps/stolon-pg-keeper 3/3 14m

NAME COMPLETIONS DURATION AGE

job.batch/stolon-pg-create-cluster 1/1 5s 14m

[/codesyntax]

подключаемся к базе, для этого смотрим IP адрес:

[codesyntax lang="php"]

[root@minikub stolon]# <strong>kubectl -n postgres get services | fgrep proxy</strong>
stolon-pg-proxy             ClusterIP   <strong>10.101.142.225  </strong> &lt;none&gt;        5432/TCP   4m28s

[root@minikub stolon]# kubectl -n postgres get services | fgrep proxy

stolon-pg-proxy ClusterIP 10.101.142.225 <none> 5432/TCP 4m28s

[/codesyntax]

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-0 -- psql --host 10.101.142.225 --port 5432 --username MY_USER -W postgres

MY_USER - так я обозвал пользователя
MY_PASSWORD -это мой пароль

[codesyntax lang="php"]

Password for user MY_USER:
psql (10.12 (Debian 10.12-1.pgdg90+1))
Type "help" for help.

postgres=# \l
                               List of databases
   Name    |  Owner  | Encoding |  Collate   |   Ctype    |  Access privileges
-----------+---------+----------+------------+------------+---------------------
 postgres  | MY_USER | UTF8     | en_US.utf8 | en_US.utf8 |
 template0 | MY_USER | UTF8     | en_US.utf8 | en_US.utf8 | =c/MY_USER         +
           |         |          |            |            | MY_USER=CTc/MY_USER
 template1 | MY_USER | UTF8     | en_US.utf8 | en_US.utf8 | =c/MY_USER         +
           |         |          |            |            | MY_USER=CTc/MY_USER
(3 rows)

Password for user MY_USER:

psql (10.12 (Debian 10.12-1.pgdg90+1))

Type "help" for help.

postgres=# \l

List of databases

-----------+---------+----------+------------+------------+---------------------

(3 rows)

[/codesyntax]

создаём базу:

postgres=# CREATE DATABASE test;
CREATE DATABASE

выходим и переконекчиваемся под новой базой:

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-0 -- psql --host 10.101.142.225 --port 5432 --username MY_USER -W -d test

создадим таблицу, добавим в неё данные

[codesyntax lang="php"]

Password for user MY_USER:
psql (10.12 (Debian 10.12-1.pgdg90+1))
Type "help" for help.

test=#
test=# create table test (id int primary key not null, value text not null);
CREATE TABLE
test=# insert into test values (1, 'value1');
INSERT 0 1
test=# select * from test;
 id | value
----+--------
  1 | value1
(1 row)

test=# \du
                                     List of roles
   Role name   |                         Attributes                         | Member of
---------------+------------------------------------------------------------+-----------
 MY_USER       | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
 repl_username | Replication                                                | {}

Password for user MY_USER:

psql (10.12 (Debian 10.12-1.pgdg90+1))

Type "help" for help.

test=#

test=# create table test (id int primary key not null, value text not null);

CREATE TABLE

test=# insert into test values (1, 'value1');

INSERT 0 1

test=# select * from test;

id | value

----+--------

1 | value1

(1 row)

test=# \du

List of roles

Role name | Attributes | Member of

---------------+------------------------------------------------------------+-----------

MY_USER | Superuser, Create role, Create DB, Replication, Bypass RLS | {}

repl_username | Replication | {}

[/codesyntax]

Проверим что будет если master грохнуть:

[codesyntax lang="php"]

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-0 -- psql --host 10.101.142.225 --port 5432 --username MY_USER  -W -d test
Password for user MY_USER:

psql (10.12 (Debian 10.12-1.pgdg90+1))
Type "help" for help.

test=# select pg_is_in_recovery();
 pg_is_in_recovery
-------------------
 f
(1 row)

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-0 -- psql --host 10.101.142.225 --port 5432 --username MY_USER -W -d test

Password for user MY_USER:

psql (10.12 (Debian 10.12-1.pgdg90+1))

Type "help" for help.

test=# select pg_is_in_recovery();

pg_is_in_recovery

-------------------

(1 row)

[/codesyntax]

stolon-pg-keeper-0мастер, потому что pg_is_in_recoveryв состоянии false

не закрывая оболочку откроем второе окно и грохнем мастера:

[root@minikub ~]# kubectl -n postgres delete pod stolon-pg-keeper-0
pod "stolon-pg-keeper-0" deleted

смотрим логи сентинеля:

[root@minikub stolon]# kubectl logs -f -n postgres stolon-pg-sentinel-59f9df4676-mcnq6

[codesyntax lang="php"]

2020-10-02T08:23:50.507Z        WARN    cmd/sentinel.go:266     no keeper info available        {"db": "c9b80de7", "keeper": "keeper1"}
2020-10-02T08:23:50.507Z        WARN    cmd/sentinel.go:266     no keeper info available        {"db": "7f99e9eb", "keeper": "keeper0"}
2020-10-02T08:23:55.654Z        WARN    cmd/sentinel.go:266     no keeper info available        {"db": "c9b80de7", "keeper": "keeper1"}
2020-10-02T08:24:05.759Z        INFO    cmd/sentinel.go:1267    removing failed synchronous standby     {"masterDB": "7f99e9eb", "db": "c9b80de7"}
2020-10-02T08:24:05.760Z        INFO    cmd/sentinel.go:1305    adding new synchronous standby in good state trying to reach MaxSynchronousStandbys     {"masterDB": "7f99e9eb", "synchronousStandbyDB": "607490bc", "keeper": "keeper2"}
2020-10-02T08:24:05.760Z        INFO    cmd/sentinel.go:1349    merging current and previous synchronous standbys       {"masterDB": "7f99e9eb", "prevSynchronousStandbys": {"c9b80de7":{}}, "synchronousStandbys": {"607490bc":{}}}
2020-10-02T08:24:05.760Z        INFO    cmd/sentinel.go:1353    adding previous synchronous standby     {"masterDB": "7f99e9eb", "synchronousStandbyDB": "c9b80de7", "keeper": "keeper1"}
2020-10-02T08:24:05.760Z        INFO    cmd/sentinel.go:1361    synchronousStandbys changed     {"masterDB": "7f99e9eb", "prevSynchronousStandbys": {"c9b80de7":{}}, "synchronousStandbys": {"607490bc":{},"c9b80de7":{}}}
2020-10-02T08:24:15.871Z        INFO    cmd/sentinel.go:1284    removing synchronous standby in excess  {"masterDB": "7f99e9eb", "db": "607490bc"}
2020-10-02T08:24:15.871Z        INFO    cmd/sentinel.go:1361    synchronousStandbys changed     {"masterDB": "7f99e9eb", "prevSynchronousStandbys": {"607490bc":{},"c9b80de7":{}}, "synchronousStandbys": {"c9b80de7":{}}}

2020-10-02T08:23:50.507Z WARN cmd/sentinel.go:266 no keeper info available {"db": "c9b80de7", "keeper": "keeper1"}

2020-10-02T08:23:50.507Z WARN cmd/sentinel.go:266 no keeper info available {"db": "7f99e9eb", "keeper": "keeper0"}

2020-10-02T08:23:55.654Z WARN cmd/sentinel.go:266 no keeper info available {"db": "c9b80de7", "keeper": "keeper1"}

2020-10-02T08:24:05.759Z INFO cmd/sentinel.go:1267 removing failed synchronous standby {"masterDB": "7f99e9eb", "db": "c9b80de7"}

2020-10-02T08:24:05.760Z INFO cmd/sentinel.go:1305 adding new synchronous standby in good state trying to reach MaxSynchronousStandbys {"masterDB": "7f99e9eb", "synchronousStandbyDB": "607490bc", "keeper": "keeper2"}

2020-10-02T08:24:05.760Z INFO cmd/sentinel.go:1349 merging current and previous synchronous standbys {"masterDB": "7f99e9eb", "prevSynchronousStandbys": {"c9b80de7":{}}, "synchronousStandbys": {"607490bc":{}}}

2020-10-02T08:24:05.760Z INFO cmd/sentinel.go:1353 adding previous synchronous standby {"masterDB": "7f99e9eb", "synchronousStandbyDB": "c9b80de7", "keeper": "keeper1"}

2020-10-02T08:24:05.760Z INFO cmd/sentinel.go:1361 synchronousStandbys changed {"masterDB": "7f99e9eb", "prevSynchronousStandbys": {"c9b80de7":{}}, "synchronousStandbys": {"607490bc":{},"c9b80de7":{}}}

2020-10-02T08:24:15.871Z INFO cmd/sentinel.go:1284 removing synchronous standby in excess {"masterDB": "7f99e9eb", "db": "607490bc"}

2020-10-02T08:24:15.871Z INFO cmd/sentinel.go:1361 synchronousStandbys changed {"masterDB": "7f99e9eb", "prevSynchronousStandbys": {"607490bc":{},"c9b80de7":{}}, "synchronousStandbys": {"c9b80de7":{}}}

[/codesyntax]

теперь смотрим по конфигам кто есть кто:

[codesyntax lang="php"]

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-1 cat /stolon-data/postgres/postgresql.conf | fgrep sync
synchronous_standby_names = 'stolon_64676afb'
[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-0 cat /stolon-data/postgres/postgresql.conf | fgrep sync
synchronous_standby_names = ''
[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-2 cat /stolon-data/postgres/postgresql.conf | fgrep sync
synchronous_standby_names = ''
[root@minikub stolon]#
[root@minikub stolon]#
[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-1 cat /stolon-data/postgres/recovery.conf | fgrep slot_name
command terminated with exit code 1
[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-0 cat /stolon-data/postgres/recovery.conf | fgrep slot_name
primary_slot_name = 'stolon_64676afb'
[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-2 cat /stolon-data/postgres/recovery.conf | fgrep slot_name
primary_slot_name = 'stolon_cdca3cc3'

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-1 cat /stolon-data/postgres/postgresql.conf | fgrep sync

synchronous_standby_names = 'stolon_64676afb'

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-0 cat /stolon-data/postgres/postgresql.conf | fgrep sync

synchronous_standby_names = ''

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-2 cat /stolon-data/postgres/postgresql.conf | fgrep sync

synchronous_standby_names = ''

[root@minikub stolon]#

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-1 cat /stolon-data/postgres/recovery.conf | fgrep slot_name

command terminated with exit code 1

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-0 cat /stolon-data/postgres/recovery.conf | fgrep slot_name

primary_slot_name = 'stolon_64676afb'

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-2 cat /stolon-data/postgres/recovery.conf | fgrep slot_name

primary_slot_name = 'stolon_cdca3cc3'

[/codesyntax]

keeper-2 - async replica
keeper-1 - master
keeper-0 - sync replica

после всех наших манипуляций, подключаюсь к базе и проверяю данные:

[codesyntax lang="php"]

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-0 -- psql --host 10.101.142.225 --port 5432 --username MY_USER -W -d test
Password for user MY_USER:
psql (10.12 (Debian 10.12-1.pgdg90+1))
Type "help" for help.

test=# select * from test;
 id | value
----+--------
  1 | value1
(1 row)

[root@minikub stolon]# kubectl -n postgres exec -it stolon-pg-keeper-0 -- psql --host 10.101.142.225 --port 5432 --username MY_USER -W -d test

Password for user MY_USER:

psql (10.12 (Debian 10.12-1.pgdg90+1))

Type "help" for help.

test=# select * from test;

id | value

----+--------

1 | value1

(1 row)

[/codesyntax]

как видим всё нормально.

так же при переезде мастера на другой кипер мы можем увидеть что место на nfs сервере меняется.
Тут мастер на keeper-1

[codesyntax lang="php"]

[root@minikub stolon]# du -csh /nfs-client/*
16K     /nfs-client/lost+found
95M     /nfs-client/postgres-data-stolon-pg-keeper-0-pvc-43fc5a5d-e203-4ebd-bb68-e40738780dc5
<strong>159M   </strong> /nfs-client/postgres-data-stolon-pg-keeper-1-pvc-6602d824-b3c3-4df8-b7fa-cc49b3d62c17
63M     /nfs-client/postgres-data-stolon-pg-keeper-2-pvc-dcb8ea84-651d-4f1a-8032-a67409fba5c7
8.0K    /nfs-client/tmp

[root@minikub stolon]# du -csh /nfs-client/*

16K /nfs-client/lost+found

95M /nfs-client/postgres-data-stolon-pg-keeper-0-pvc-43fc5a5d-e203-4ebd-bb68-e40738780dc5

159M /nfs-client/postgres-data-stolon-pg-keeper-1-pvc-6602d824-b3c3-4df8-b7fa-cc49b3d62c17

63M /nfs-client/postgres-data-stolon-pg-keeper-2-pvc-dcb8ea84-651d-4f1a-8032-a67409fba5c7

8.0K /nfs-client/tmp

[/codesyntax]

а тут на keeper-0

[codesyntax lang="php"]

[root@minikub stolon]# du -csh /nfs-client/*
16K     /nfs-client/lost+found
<strong>191M   </strong> /nfs-client/postgres-data-stolon-pg-keeper-0-pvc-43fc5a5d-e203-4ebd-bb68-e40738780dc5
63M     /nfs-client/postgres-data-stolon-pg-keeper-1-pvc-6602d824-b3c3-4df8-b7fa-cc49b3d62c17
95M     /nfs-client/postgres-data-stolon-pg-keeper-2-pvc-dcb8ea84-651d-4f1a-8032-a67409fba5c7
8.0K    /nfs-client/tmp

[root@minikub stolon]# du -csh /nfs-client/*

16K /nfs-client/lost+found

191M /nfs-client/postgres-data-stolon-pg-keeper-0-pvc-43fc5a5d-e203-4ebd-bb68-e40738780dc5

63M /nfs-client/postgres-data-stolon-pg-keeper-1-pvc-6602d824-b3c3-4df8-b7fa-cc49b3d62c17

95M /nfs-client/postgres-data-stolon-pg-keeper-2-pvc-dcb8ea84-651d-4f1a-8032-a67409fba5c7

8.0K /nfs-client/tmp

[/codesyntax]

как видим объём изменился.

Centos

Kubernetes – запуск stolon

ЛЮБАЯ БАЗА ДАННЫХ В КОНТЕЙНЕРЕ - ЭТО ЗЛО.

https://github.com/midnight47/

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