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kubernetes生产实践之mysql

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kubernetes生产实践之mysql

scofield 菜鸟运维杂谈

简介

kubedb mysql 生命周期及特性

kubernetes生产实践之mysql - 文章图片


Supported MySQL Features
Features    Availability
Clustering    ?
Persistent Volume    ?
Instant Backup    ?
Scheduled Backup    ?
Initialize using Snapshot    ?
Initialize using Script (*.sql, *sql.gz and/or *.sh)    ?
Custom Configuration    ?
Using Custom docker image    ?
Builtin Prometheus Discovery    ?
Using Prometheus operator    ?

查看kubedb支持的mysql版本


[root@qd01-stop-k8s-master001 mysql]# kubectl get mysqlversions
NAME        VERSION   DB_IMAGE                 DEPRECATED   AGE
5.7.25-v1   5.7.25    kubedb/mysql:5.7.25-v1                17h
5.7.29      5.7.29    kubedb/mysql:5.7.29                   17h
5.7.31      5.7.31    kubedb/mysql:5.7.31                   17h
8.0.14-v1   8.0.14    kubedb/mysql:8.0.14-v1                17h
8.0.20      8.0.20    kubedb/mysql:8.0.20                   17h
8.0.21      8.0.21    kubedb/mysql:8.0.21                   17h
8.0.3-v1    8.0.3     kubedb/mysql:8.0.3-v1                 17h

编写配置文件

mode: GroupReplication

kubernetes生产实践之mysql - 文章图片

group.name可以使用这个网站生成：https://www.uuidgenerator.net/version4


apiVersion: kubedb.com/v1alpha2
kind: MySQL
metadata:
  name: mysql-group-test
  namespace: op
spec:
  version: "8.0.21"
  replicas: 3
  topology:
    mode: GroupReplication
    group:
      name: "d7f38430-d9ee-464b-af43-da9efa26fe02"
      baseServerID: 100
  storageType: Durable
  storage:
    storageClassName: "rbd"
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 50Gi
  terminationPolicy: Halt

安装Mysql


[root@qd01-stop-k8s-master001 mysql]# kubectl apply -f mysql-cluster-install.yaml
mysql.kubedb.com/mysql-group-test created

[root@qd01-stop-k8s-master001 mysql]# kubectl get po,ep,svc -n op
NAME                     READY   STATUS    RESTARTS   AGE
pod/mysql-group-test-0   2/2     Running   0          14m
pod/mysql-group-test-1   2/2     Running   0          9m41s
pod/mysql-group-test-2   2/2     Running   0          4m19s

NAME                                 ENDPOINTS                                                     AGE
endpoints/mysql-group-test           100.64.147.157:3306                                           14m
endpoints/mysql-group-test-pods      100.64.122.198:3306,100.64.147.157:3306,100.98.174.219:3306   14m
endpoints/mysql-group-test-standby   100.98.174.219:3306                                           14m

NAME                               TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
service/mysql-group-test           ClusterIP   10.108.25.179   <none>        3306/TCP   14m
service/mysql-group-test-pods      ClusterIP   None            <none>        3306/TCP   14m
service/mysql-group-test-standby   ClusterIP   10.101.164.49   <none>        3306/TCP   14m

可以使用kubectl describe查看mysql集群详细信息


[root@qd01-stop-k8s-master001 mysql]# kubectl describe mysql mysql-group-test -n op
Name:         mysql-group-test
Namespace:    op
Labels:       <none>
Annotations:  <none>
API Version:  kubedb.com/v1alpha2
Kind:         MySQL
Metadata:
  Creation Timestamp:  2021-03-11T02:03:38Z
  Finalizers:
    kubedb.com
  Generation:  2
  Managed Fields:
    API Version:  kubedb.com/v1alpha2
    Fields Type:  FieldsV1
    fieldsV1:
      f:metadata:
        f:annotations:
          .:
          f:kubectl.kubernetes.io/last-applied-configuration:
      f:spec:
        .:
        f:replicas:
        f:storage:
          .:
          f:accessModes:
          f:resources:
            .:
            f:requests:
              .:
              f:storage:
          f:storageClassName:
        f:storageType:
        f:terminationPolicy:
        f:topology:
          .:
          f:group:
            .:
            f:baseServerID:
            f:name:
          f:mode:
        f:version:
    Manager:      kubectl-client-side-apply
    Operation:    Update
    Time:         2021-03-11T02:03:38Z
    API Version:  kubedb.com/v1alpha2
    Fields Type:  FieldsV1
    fieldsV1:
      f:metadata:
        f:finalizers:
      f:spec:
        f:authSecret:
          .:
          f:name:
      f:status:
        .:
        f:conditions:
        f:observedGeneration:
        f:phase:
    Manager:         operator
    Operation:       Update
    Time:            2021-03-11T02:03:39Z
  Resource Version:  7283091
  UID:               38d0b2c8-2d56-4fcf-ba3b-dff211d8a63d
Spec:
  Auth Secret:
    Name:  mysql-group-test-auth
  Pod Template:
    Controller:
    Metadata:
    Spec:
      Affinity:
        Pod Anti Affinity:
          Preferred During Scheduling Ignored During Execution:
            Pod Affinity Term:
              Label Selector:
                Match Labels:
                  app.kubernetes.io/instance:    mysql-group-test
                  app.kubernetes.io/managed-by:  kubedb.com
                  app.kubernetes.io/name:        mysqls.kubedb.com
              Namespaces:
                op
              Topology Key:  kubernetes.io/hostname
            Weight:          100
            Pod Affinity Term:
              Label Selector:
                Match Labels:
                  app.kubernetes.io/instance:    mysql-group-test
                  app.kubernetes.io/managed-by:  kubedb.com
                  app.kubernetes.io/name:        mysqls.kubedb.com
              Namespaces:
                op
              Topology Key:  failure-domain.beta.kubernetes.io/zone
            Weight:          50
      Resources:
        Limits:
          Cpu:     500m
          Memory:  1Gi
        Requests:
          Cpu:               500m
          Memory:            1Gi
      Service Account Name:  mysql-group-test
  Replicas:                  3
  Storage:
    Access Modes:
      ReadWriteOnce
    Resources:
      Requests:
        Storage:         50Gi
    Storage Class Name:  rbd
  Storage Type:          Durable
  Termination Policy:    Halt
  Topology:
    Group:
      Base Server ID:  100
      Name:            d7f38430-d9ee-464b-af43-da9efa26fe02
    Mode:              GroupReplication
  Version:             8.0.21
Status:
  Conditions:
    Last Transition Time:  2021-03-11T02:03:39Z
    Message:               The KubeDB operator has started the provisioning of MySQL: op/mysql-group-test
    Reason:                DatabaseProvisioningStartedSuccessfully
    Status:                True
    Type:                  ProvisioningStarted
    Last Transition Time:  2021-03-11T02:21:17Z
    Message:               All desired replicas are ready.
    Reason:                AllReplicasReady
    Status:                True
    Type:                  ReplicaReady
    Last Transition Time:  2021-03-11T02:03:49Z
    Message:               The MySQL: op/mysql-group-test is accepting client requests.
    Observed Generation:   2
    Reason:                DatabaseAcceptingConnectionRequest
    Status:                True
    Type:                  AcceptingConnection
    Last Transition Time:  2021-03-11T02:21:17Z
    Message:               The MySQL: op/mysql-group-test is ready.
    Observed Generation:   2
    Reason:                ReadinessCheckSucceeded
    Status:                True
    Type:                  Ready
    Last Transition Time:  2021-03-11T02:21:18Z
    Message:               The MySQL: op/mysql-group-test is successfully provisioned.
    Observed Generation:   2
    Reason:                DatabaseSuccessfullyProvisioned
    Status:                True
    Type:                  Provisioned
  Observed Generation:     2
  Phase:                   Ready
Events:
  Type    Reason      Age    From             Message
  ----    ------      ----   ----             -------
  Normal  Successful  17m    KubeDB Operator  Successfully created governing service
  Normal  Successful  17m    KubeDB Operator  Successfully created service for primary/standalone
  Normal  Successful  17m    KubeDB Operator  Successfully created service for secondary replicas
  Normal  Successful  17m    KubeDB Operator  Successfully created database auth secret
  Normal  Successful  17m    KubeDB Operator  Successfully created StatefulSet
  Normal  Successful  17m    KubeDB Operator  Successfully created appbinding
  Normal  Successful  17m    KubeDB Operator  Successfully patched StatefulSet
  Normal  Successful  17m    KubeDB Operator  Successfully patched StatefulSet
  Normal  Successful  13m    KubeDB Operator  Successfully patched StatefulSet
  Normal  Successful  11m    KubeDB Operator  Successfully patched StatefulSet
  Normal  Successful  7m39s  KubeDB Operator  Successfully patched StatefulSet
  Normal  Successful  102s   KubeDB Operator  Successfully patched StatefulSet
  Normal  Successful  16s    KubeDB Operator  Successfully patched StatefulSet
  Normal  Successful  16s    KubeDB Operator  Successfully patched StatefulSet
  Normal  Successful  16s    KubeDB Operator  Successfully patched StatefulSet

从以上输出可以看到，集群部署完毕。

验证数据库

1、获取root用户名密码


[root@qd01-stop-k8s-master001 mysql]# kubectl get secrets -n op mysql-group-test-auth  -o jsonpath='{.data.\username}' | base64 -d
root
[root@qd01-stop-k8s-master001 mysql]# kubectl get secrets -n op mysql-group-test-auth  -o jsonpath='{.data.\password}' | base64 -d
8(wVGGRfF4iQq1Zt

2、查看mysql pod 列表


[root@qd01-stop-k8s-master001 mysql]# kubectl get pods -n op -l app.kubernetes.io/instance=mysql-group-test  -o jsonpath='{range.items[*]}{.metadata.name} ........... {.status.podIP} ............ {.metadata.name}.my-group-gvr.{.metadata.namespace}{"\t\n"}{end}'
mysql-group-test-0 ........... 100.64.147.157 ............ mysql-group-test-0.my-group-gvr.op
mysql-group-test-1 ........... 100.98.174.219 ............ mysql-group-test-1.my-group-gvr.op
mysql-group-test-2 ........... 100.64.122.198 ............ mysql-group-test-2.my-group-gvr.op

[root@qd01-stop-k8s-master001 mysql]# kubectl get svc -n op
NAME                       TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
mysql-group-test           ClusterIP   10.108.25.179   <none>        3306/TCP   43m
mysql-group-test-pods      ClusterIP   None            <none>        3306/TCP   43m
mysql-group-test-standby   ClusterIP   10.101.164.49   <none>        3306/TCP   43m

3、现在可以使用获取到的信息连接数据库


[root@qd01-stop-k8s-master001 mysql]# kubectl exec -it -n op mysql-group-test-0 -c mysql -- mysql -u root --password="8(wVGGRfF4iQq1Zt"  --host=10.108.25.179  -e "select 1;"
mysql: [Warning] Using a password on the command line interface can be insecure.
+---+
| 1 |
+---+
| 1 |
+---+

4、检查集群状态


[root@qd01-stop-k8s-master001 mysql]# kubectl exec -it -n op mysql-group-test-0 -c mysql -- mysql -u root --password="8(wVGGRfF4iQq1Zt"  --host=10.108.25.179  -e "show status like '%primary%'"
mysql: [Warning] Using a password on the command line interface can be insecure.
+----------------------------------+--------------------------------------+
| Variable_name                    | Value                                |
+----------------------------------+--------------------------------------+
| group_replication_primary_member | 596744e1-820e-11eb-8425-f2f48f05462c |
+----------------------------------+--------------------------------------+

[root@qd01-stop-k8s-master001 mysql]# kubectl exec -it -n op mysql-group-test-0 -c mysql -- mysql -u root --password="8(wVGGRfF4iQq1Zt"  --host=10.108.25.179  -e "select * from performance_schema.replication_group_members"
mysql: [Warning] Using a password on the command line interface can be insecure.
+---------------------------+--------------------------------------+---------------------------------------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST                                 | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+---------------------------------------------+-------------+--------------+-------------+----------------+
| group_replication_applier | 18b45cbd-820f-11eb-8060-9a70fb141a1f | mysql-group-test-1.mysql-group-test-pods.op |        3306 | ONLINE       | SECONDARY   | 8.0.21         |
| group_replication_applier | 1dd5699c-8210-11eb-b13a-9a07d15a7e1f | mysql-group-test-2.mysql-group-test-pods.op |        3306 | ONLINE       | SECONDARY   | 8.0.21         |
| group_replication_applier | 596744e1-820e-11eb-8425-f2f48f05462c | mysql-group-test-0.mysql-group-test-pods.op |        3306 | ONLINE       | PRIMARY     | 8.0.21         |
+---------------------------+--------------------------------------+---------------------------------------------+-------------+--------------+-------------+----------------+

5、故障测试

我现在把PRIMARY的mysql-group-test-0 pod删除，然后再查看集群信息，mysql-group-test-1会提升为PRIMARY


[root@qd01-stop-k8s-master001 ~]# kubectl delete po  mysql-group-test-0 -n op
[root@qd01-stop-k8s-master001 ~]# kubectl exec -it -n op mysql-group-test-0 -n op -c mysql -- mysql -u root --password="8(wVGGRfF4iQq1Zt"  --host=10.108.25.179  -e "select * from performance_schema.replication_group_members"
mysql: [Warning] Using a password on the command line interface can be insecure.
+---------------------------+--------------------------------------+---------------------------------------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST                                 | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+---------------------------------------------+-------------+--------------+-------------+----------------+
| group_replication_applier | 18b45cbd-820f-11eb-8060-9a70fb141a1f | mysql-group-test-1.mysql-group-test-pods.op |        3306 | ONLINE       | PRIMARY     | 8.0.21         |
| group_replication_applier | 1dd5699c-8210-11eb-b13a-9a07d15a7e1f | mysql-group-test-2.mysql-group-test-pods.op |        3306 | ONLINE       | SECONDARY   | 8.0.21         |
+---------------------------+--------------------------------------+---------------------------------------------+-------------+--------------+-------------+----------------+

等待一段时间 mysql-group-test-0起来以后，角色就变成SECONDARY
[root@qd01-stop-k8s-master001 ~]# kubectl exec -it -n op mysql-group-test-0 -c mysql -- mysql -u root --password="8(wVGGRfF4iQq1Zt"  --host=10.108.25.179  -e "select * from performance_schema.replication_group_members"
mysql: [Warning] Using a password on the command line interface can be insecure.
+---------------------------+--------------------------------------+---------------------------------------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST                                 | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+---------------------------------------------+-------------+--------------+-------------+----------------+
| group_replication_applier | 18b45cbd-820f-11eb-8060-9a70fb141a1f | mysql-group-test-1.mysql-group-test-pods.op |        3306 | ONLINE       | PRIMARY     | 8.0.21         |
| group_replication_applier | 1dd5699c-8210-11eb-b13a-9a07d15a7e1f | mysql-group-test-2.mysql-group-test-pods.op |        3306 | ONLINE       | SECONDARY   | 8.0.21         |
| group_replication_applier | 596744e1-820e-11eb-8425-f2f48f05462c | mysql-group-test-0.mysql-group-test-pods.op |        3306 | ONLINE       | SECONDARY   | 8.0.21         |
+---------------------------+--------------------------------------+---------------------------------------------+-------------+--------------+-------------+----------------+

注意：因为本文部署是使用的是GroupReplication模式（目前kubed只支持这种模式），只能从PRIMARY节点写入数据，所有节点都可以读取数据；如下图所示。

kubernetes生产实践之mysql - 文章图片

如果想使用集群模式，参见以前的文章
PS：文章会同步到dev.kubeops.net

内容总结

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首页 / MYSQL / kubernetes生产实践之mysql

kubernetes生产实践之mysql

内容导读

内容图文

kubernetes生产实践之mysql

简介

查看kubedb支持的mysql版本

编写配置文件

安装Mysql

验证数据库

内容总结

内容备注

内容手机端

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