kubernetes mongodb生产实践

简介

先看下生命周期图

kubernetes生产实践之mongodb

kubedb支持的mongodb版本

[[email protected] mysql]# kubectl get mongodbversions

NAME VERSION DB_IMAGE DEPRECATED AGE

3.4.17-v1 3.4.17 kubedb/mongo:3.4.17-v1 46h

3.4.22-v1 3.4.22 kubedb/mongo:3.4.22-v1 46h

3.6.13-v1 3.6.13 kubedb/mongo:3.6.13-v1 46h

3.6.18-percona 3.6.18 percona/percona-server-mongodb:3.6.18 46h

3.6.8-v1 3.6.8 kubedb/mongo:3.6.8-v1 46h

4.0.10-percona 4.0.10 percona/percona-server-mongodb:4.0.10 46h

4.0.11-v1 4.0.11 kubedb/mongo:4.0.11-v1 46h

4.0.3-v1 4.0.3 kubedb/mongo:4.0.3-v1 46h

4.0.5-v3 4.0.5 kubedb/mongo:4.0.5-v3 46h

4.1.13-v1 4.1.13 kubedb/mongo:4.1.13-v1 46h

4.1.4-v1 4.1.4 kubedb/mongo:4.1.4-v1 46h

4.1.7-v3 4.1.7 kubedb/mongo:4.1.7-v3 46h

4.2.3 4.2.3 kubedb/mongo:4.2.3 46h

4.2.7-percona 4.2.7 percona/percona-server-mongodb:4.2.7-7 46h

MongoDB ReplicaSet

mongodb复制集模式架构如下图

kubernetes生产实践之mongodb

1、定义配置文件,创建secret

cat mongod.conf

net:

maxIncomingConnections: 10000

[[email protected] Replication]# kubectl create secret generic -n op mg-configuration --from-file=./mongod.conf

secret/mg-configuration created

[[email protected] Replication]# kubectl get secret -n op

NAME TYPE DATA AGE

mg-configuration Opaque 1 20s

2、定义mongod-replicaset.yaml文件

apiVersion: kubedb.com/v1alpha2

kind: MongoDB

metadata:

name: mongodb-replicaset

namespace: op

spec:

version: "4.2.3"

replicas: 3

replicaSet:

name: rs0

configSecret:

name: mg-configuration

storage:

storageClassName: "rbd"

accessModes:

- ReadWriteOnce

resources:

requests:

storage: 1Gi

3、执行安装并查看部署结果

[[email protected] Replication]# kubectl apply -f mongod-replicaset.yaml

mongodb.kubedb.com/mongodb-replicaset created

[[email protected] Replication]# kubectl get po -n op

NAME READY STATUS RESTARTS AGE

mongodb-replicaset-0 2/2 Running 0 24m

mongodb-replicaset-1 2/2 Running 0 22m

mongodb-replicaset-2 2/2 Running 0 20m

4、验证集群

# 获取用户名和密码

[[email protected] Replication]# kubectl get secrets -n demo mgo-replicaset-auth -o jsonpath='{.data.\username}' | base64 -d

root

[[email protected] Replication]# kubectl get secrets -n demo mgo-replicaset-auth -o jsonpath='{.data.\password}' | base64 -d

123456

# 登录mongodb-replicaset-0查看集群状态,并测试读写

[[email protected] Replication]# kubectl -n op exec -ti mongodb-replicaset-0 -- /bin/bash

[email protected]:/# mongo admin -uroot -p123456

MongoDB shell version v4.2.3

connecting to: mongodb://127.0.0.1:27017/admin?compressors=disabled&gssapiServiceName=mongodb

Implicit session: session { "id" : UUID("cc1b6a09-f407-44d8-be3b-8b32db4a10b0") }

MongoDB server version: 4.2.3

Welcome to the MongoDB shell.

......

rs0:PRIMARY>

# 查看当前PRIMARY节点

rs0:PRIMARY> rs.isMaster().primary

mongodb-replicaset-0.mongodb-replicaset-pods.op.svc.cluster.local:27017

# 读写数据

rs0:PRIMARY> use testdb

switched to db testdb

rs0:PRIMARY> show dbs

admin 0.000GB

config 0.000GB

local 0.000GB

rs0:PRIMARY> db.movie.insert({"name":"scofield"});

WriteResult({ "nInserted" : 1 })

rs0:PRIMARY> db.movie.find().pretty()

{ "_id" : ObjectId("604b17469d22a18817a5927e"), "name" : "scofield" }

MongoDB Sharding

mongodb分片模式架构如下图

kubernetes生产实践之mongodb

shard :每个分片包含分片数据的子集。 从MongoDB 3.6开始,分片必须作为副本集部署。

mongos:mongos充当查询路由器,在客户端应用程序和分片群集之间提供接口。

config servers:配置服务器存储群集的元数据和配置设置。 从MongoDB 3.4开始,配置服务器必须部署为副本集(CSRS)。

1、编写mongodb-sharding.yaml

apiVersion: kubedb.com/v1alpha2

kind: MongoDB

metadata:

name: mongo-sharding

namespace: op

spec:

version: 4.2.3

shardTopology:

configServer:

replicas: 3

storage:

resources:

requests:

storage: 1Gi

storageClassName: rbd

mongos:

replicas: 2

shard:

replicas: 3

shards: 2

storage:

resources:

requests:

storage: 1Gi

storageClassName: rbd

2、执行部署,并查看部署状态

[[email protected] Sharded]# kubectl apply -f mongodb-sharding.yaml

mongodb.kubedb.com/mongo-sharding created

[[email protected] Sharded]# kubectl get po -n op

NAME READY STATUS RESTARTS AGE

mongo-sharding-configsvr-0 1/1 Running 0 27m

mongo-sharding-configsvr-1 1/1 Running 0 12m

mongo-sharding-configsvr-2 1/1 Running 0 9m54s

mongo-sharding-mongos-0 1/1 Running 0 7m27s

mongo-sharding-mongos-1 1/1 Running 0 4m23s

mongo-sharding-shard0-0 1/1 Running 0 27m

mongo-sharding-shard0-1 1/1 Running 0 25m

mongo-sharding-shard0-2 1/1 Running 0 24m

mongo-sharding-shard1-0 1/1 Running 0 27m

mongo-sharding-shard1-1 1/1 Running 0 25m

mongo-sharding-shard1-2 1/1 Running 0 22m

和复制集相比,分片集需要更多的资源。以保证整个集群的健壮性,而且能后提供更大容量的存储空间。

3、验证集群状态及读写

# 获取账号密码

kubectl get secrets -n demo mongo-sh-auth -o jsonpath='{.data.\username}' | base64 -d

root

kubectl get secrets -n demo mongo-sh-auth -o jsonpath='{.data.\password}' | base64 -d

123456

# 连接mongo

[email protected]:/# mongo admin -u root -p

MongoDB shell version v4.2.3

Enter password:

connecting to: mongodb://127.0.0.1:27017/admin?compressors=disabled&gssapiServiceName=mongodb

Implicit session: session { "id" : UUID("948eadef-87b6-4ab2-ba5a-c8f4e23689a7") }

MongoDB server version: 4.2.3

Welcome to the MongoDB shell.

For interactive help, type "help".

For more comprehensive documentation, see

http://docs.mongodb.org/

Questions? Try the support group

http://groups.google.com/group/mongodb-user

Server has startup warnings:

2021-03-12T08:10:48.173+0000 I CONTROL [main] ** WARNING: You are running this process as the root user, which is not recommended.

2021-03-12T08:10:48.173+0000 I CONTROL [main]

mongos>

# 查看分片集群状态

mongos> sh.status()

--- Sharding Status ---

sharding version: {

"_id" : 1,

"minCompatibleVersion" : 5,

"currentVersion" : 6,

"clusterId" : ObjectId("604b201f7fb058e04bb03ef0")

}

shards:

{ "_id" : "shard0", "host" : "shard0/mongo-sharding-shard0-0.mongo-sharding-shard0-pods.op.svc.cluster.local:27017,mongo-sharding-shard0-1.mongo-sharding-shard0-pods.op.svc.cluster.local:27017,mongo-sharding-shard0-2.mongo-sharding-shard0-pods.op.svc.cluster.local:27017", "state" : 1 }

{ "_id" : "shard1", "host" : "shard1/mongo-sharding-shard1-0.mongo-sharding-shard1-pods.op.svc.cluster.local:27017,mongo-sharding-shard1-1.mongo-sharding-shard1-pods.op.svc.cluster.local:27017,mongo-sharding-shard1-2.mongo-sharding-shard1-pods.op.svc.cluster.local:27017", "state" : 1 }

active mongoses:

"4.2.3" : 2

autosplit:

Currently enabled: yes

balancer:

Currently enabled: yes

Currently running: no

Failed balancer rounds in last 5 attempts: 0

Migration Results for the last 24 hours:

No recent migrations

databases:

{ "_id" : "config", "primary" : "config", "partitioned" : true }

config.system.sessions

shard key: { "_id" : 1 }

unique: false

balancing: true

chunks:

shard0 1

{ "_id" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 } } on : shard0 Timestamp(1, 0)

#创建分片

mongos> sh.enableSharding("test");

{

"ok" : 1,

"operationTime" : Timestamp(1615538870, 3),

"$clusterTime" : {

"clusterTime" : Timestamp(1615538870, 3),

"signature" : {

"hash" : BinData(0,"CTnuwtgOIn+ke0qqarLQIi+VXz8="),

"keyId" : NumberLong("6938674968410456068")

}

}

}

# 创建集合

mongos> sh.shardCollection("test.testcoll", {"myfield": 1});

{

"collectionsharded" : "test.testcoll",

"collectionUUID" : UUID("313cacbe-014c-4e0a-9112-427de2351bdd"),

"ok" : 1,

"operationTime" : Timestamp(1615539067, 9),

"$clusterTime" : {

"clusterTime" : Timestamp(1615539067, 9),

"signature" : {

"hash" : BinData(0,"1RQN94R6yHvUa0SqBHkiV2hUXNM="),

"keyId" : NumberLong("6938674968410456068")

}

}

}

# 写入数据

mongos> db.testcoll.insert({"myfield": "scofield", "agefield": "18"});

WriteResult({ "nInserted" : 1 })

mongos> db.testcoll.insert({"myfield": "amos", "otherfield": "d", "kube" : "db" });

WriteResult({ "nInserted" : 1 })

# 获取数据

mongos> db.testcoll.find();

{ "_id" : ObjectId("604b2d099446ca80f20bab7f"), "myfield" : "scofield", "agefield" : "18" }

{ "_id" : ObjectId("604b2d4d9446ca80f20bab80"), "myfield" : "amos", "otherfield" : "d", "kube" : "db" }

以上是 kubernetes mongodb生产实践 的全部内容, 来源链接: www.h5w3.com/122260.html

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