6 k8s-mongodb集群部署(副本集)

本文主要是介绍6 k8s-mongodb集群部署(副本集)，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

1 环境说明

补充: kubernetes集群的控制节点我打了污点不能被pod调度使用。

1 nfs服务部署
节点: k8s_nfs
用途: k8s pod 数据持久化存储
说明: nfs服务的搭建过程不再赘述
验证:
[root@k8s_nfs ~]# showmount -e 172.16.1.60
Export list for 172.16.1.60:
/ifs/kubernetes *
​
nfs-subdir-external-provisioner插件部署
节点: kubernetes集群
用途: 为中间件pod提供pvc自动供给
说明: nfs pvc自动供给插件的部署过程不再赘述。修改"deployment.yaml"文件中连接nfs服务的地址和nfs共享目录参数；修改"class.yaml"
文件中"archiveOnDelete"(删除时是否存档)参数为 archiveOnDelete: "true"，删除pod时保留pod数据，默认为false时为不保留数据。
注意: 在部署前需要在k8s各个节点上部署nfs的客户端(yum install nfs-utils -y)，否则无法部署成功。
​
补充:
(1) gitlab项目地址: https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner
(2) 下载 deploy 目录如下文件
class.yaml、deployment.yaml、rbac.yaml
​
查看:
[root@k8s-master1 nfs-subdir-external-provisioner-master]# ls | xargs -i kubectl apply -f {}
[root@k8s-master1 nfs-subdir-external-provisioner-master]# kubectl get deployment,pod,svc,sc -n default

2 mongodb集群部署(副本集)

2.1 创建mongodb-cluster命名空间

[root@k8s-master1 ~]# mkdir -p mongodb-cluster/
[root@k8s-master1 ~]# cd mongodb-cluster/
​
[root@k8s-master1 mongodb-cluster]# kubectl create namespace mongodb-cluster
namespace/mongodb-cluster created
[root@k8s-master1 mongodb-cluster]# 

2.2 从秘钥文件创建secret

秘钥文件用于mongodb副本集之间进行数据复制时免密码，MongoDB将使用此密钥与内部集群通信。 kubectl create secret generic: 表示根据配置文件、目录或指定的literal-value创建secret。

[root@k8s-master1 mongodb-cluster]# openssl rand -base64 741 > ./key.txt
​
[root@k8s-master1 mongodb-cluster]# kubectl create secret generic mongodb-replica-sets-key -n mongodb-cluster \
--from-file=internal-auth-mongodb-keyfile=./key.txt
secret/mongodb-replica-sets-key created
[root@k8s-master1 mongodb-cluster]# 

2.3 mongodb-statefulset.yaml

[root@k8s-master1 mongodb-cluster]# cat mongodb-statefulset.yaml
apiVersion: v1
kind: Service
metadata:
  name: mongodb-cluster
  namespace: mongodb-cluster
  labels:
    name: mongo
spec:
  ports:
  - port: 27017
    targetPort: 27017
  clusterIP: None
  selector:
    role: mongo
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mongodb-cluster
  namespace: mongodb-cluster
spec:
  serviceName: mongodb-cluster
  replicas: 3
  selector:
    matchLabels:
      role: mongo
      environment: produce
      replicaset: MainRepSet
  template:
    metadata:
      labels:
        role: mongo
        environment: produce
        replicaset: MainRepSet
    spec:
      containers:
      - name: mongodb-container
        image: registry.cn-hangzhou.aliyuncs.com/k8s-image01/mongodb:4.2.21-bionic
        command:
        - "numactl"
        - "--interleave=all"
        - "mongod"
        - "--bind_ip"
        - "0.0.0.0"
        - "--replSet"
        - "MainRepSet"
        - "--auth"
        - "--clusterAuthMode"
        - "keyFile"
        - "--keyFile"
        - "/etc/secrets-volume/internal-auth-mongodb-keyfile"
        - "--setParameter"
        - "authenticationMechanisms=SCRAM-SHA-1"
        resources:
          requests:
            cpu: 0.5
            memory: 500Mi
        ports:
        - containerPort: 27017
        volumeMounts:
        - name: secrets-volume
          readOnly: true
          mountPath: /etc/secrets-volume
        - name: mongodb-persistent-storage-claim
          mountPath: /data/db
      volumes:
      - name: secrets-volume
        secret:
          secretName: mongodb-replica-sets-key
          defaultMode: 256
  volumeClaimTemplates:
  - metadata:
      name: mongodb-persistent-storage-claim
      #annotations:
      #  volume.beta.kubernetes.io/storage-class: "standard"
    spec:
      storageClassName: "managed-nfs-storage"
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 10Gi

2.4 应用yaml文件

[root@k8s-master1 mongodb-cluster]# kubectl apply -f mongodb-statefulset.yaml
service/mongodb-cluster created
statefulset.apps/mongodb-cluster created
[root@k8s-master1 mongodb-cluster]# 

3 查看mongodb集群

3.1 查看pod

[root@k8s-master1 mongodb-cluster]# kubectl get statefulset/mongodb-cluster -n mongodb-cluster -o wide
[root@k8s-master1 mongodb-cluster]# kubectl get pod -n mongodb-cluster -o wide

3.2 查看pvc

[root@k8s-master1 mongodb-cluster]# kubectl get pvc -n mongodb-cluster -o wide

3.3 查看pv

[root@k8s-master1 mongodb-cluster]# kubectl get pv -o wide

3.4 查看nfs存储路径

[root@k8s_nfs ~]# ls -l /ifs/kubernetes/

3.5 查看svc相关信息

[root@k8s-master1 mongodb-cluster]# kubectl get svc/mongodb-cluster -n mongodb-cluster -o wide
[root@k8s-master1 mongodb-cluster]# kubectl get ep/mongodb-cluster -n mongodb-cluster -o wide

3.6 查看mongodb域名解析

# kubectl run -i --tty --image busybox:1.28.4 dns-test --restart=Never --rm /bin/sh
If you don't see a command prompt, try pressing enter.
/ # nslookup mongodb-cluster.mongodb-cluster.svc.cluster.local
Server:    172.28.0.2
Address 1: 172.28.0.2 kube-dns.kube-system.svc.cluster.local

Name:      mongodb-cluster.mongodb-cluster.svc.cluster.local
Address 1: 172.27.169.165 mongodb-cluster-1.mongodb-cluster.mongodb-cluster.svc.cluster.local
Address 2: 172.27.169.166 mongodb-cluster-2.mongodb-cluster.mongodb-cluster.svc.cluster.local
Address 3: 172.27.36.97   mongodb-cluster-0.mongodb-cluster.mongodb-cluster.svc.cluster.local
/ # exit

4 mongodb复制集配置

4.1 初始化mongodb复制集集群

我们需要连接到"mongodb"容器进程之一来配置副本集，运行以下命令以连接到第一个容器，在shell中启动副本集，由于使用了StatefulSet，我们
可以依赖主机名始终相同。

[root@k8s-master1 mongodb-cluster]# kubectl exec -it pod/mongodb-cluster-0 -n mongodb-cluster -- bash
root@mongodb-cluster-0:/# mongo
MongoDB shell version v4.2.21
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("cf61cdba-55f9-4720-8c82-d9f2ab2cf6cd") }
MongoDB server version: 4.2.21
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
	https://docs.mongodb.com/
Questions? Try the MongoDB Developer Community Forums
	https://community.mongodb.com
> use admin
switched to db admin
> 
rs.initiate({_id: "MainRepSet", version: 1, members: [
      { _id: 0, host : "mongodb-cluster-0.mongodb-cluster.mongodb-cluster.svc.cluster.local:27017" },
      { _id: 1, host : "mongodb-cluster-1.mongodb-cluster.mongodb-cluster.svc.cluster.local:27017" },
      { _id: 2, host : "mongodb-cluster-2.mongodb-cluster.mongodb-cluster.svc.cluster.local:27017" }
]});
{ "ok" : 1 }
MainRepSet:SECONDARY> 
MainRepSet:PRIMARY> 

4.2 检查mongodb副本集的状态

检查mongodb副本集的状态，直到mongodb副本集完全初始化并且存在一个主副本和两个辅助副本

MainRepSet:PRIMARY> rs.status();

mongodb-cluster-0角色变为PRIMARY，mongodb-cluster-1、mongodb-cluster-2角色变为SECONDARY。

4.3 配置"admin"用户

执行此操作会导致"mongodb匿名登录"被自动永久禁用

MainRepSet:PRIMARY> 
db.getSiblingDB("admin").createUser({
      user : "root",
      pwd  : "liuchang123456",
      roles: [ { role: "root", db: "admin" } ]
});

Successfully added user: {
	"user" : "root",
	"roles" : [
		{
			"role" : "root",
			"db" : "admin"
		}
	]
}

MainRepSet:PRIMARY> rs.status();
{
	"operationTime" : Timestamp(1656255867, 4),
	"ok" : 0,
	"errmsg" : "command replSetGetStatus requires authentication",
	"code" : 13,
	"codeName" : "Unauthorized",
	"$clusterTime" : {
		"clusterTime" : Timestamp(1656255951, 1),
		"signature" : {
			"hash" : BinData(0,"hjfd5q6urr0hk0ldnWwQzliMAIE="),
			"keyId" : NumberLong("7113556038019710977")
		}
	}
}
MainRepSet:PRIMARY> exit

4.4 验证登录mongodb副本集

root@mongodb-cluster-0:/# mongo --host mongodb-cluster-0.mongodb-cluster.mongodb-cluster.svc.cluster.local \
--port 27017 -uroot -p'liuchang123456' admin
MongoDB shell version v4.2.21
connecting to: mongodb://mongodb-cluster-0.mongodb-cluster.mongodb-cluster.svc.cluster.local:27017/admin?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("dc18d908-e263-498f-adbe-dd3ca1d41659") }
MongoDB server version: 4.2.21
Server has startup warnings: 
2022-06-26T14:23:53.744+0000 I  CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2022-06-26T14:23:53.745+0000 I  CONTROL  [initandlisten] 
2022-06-26T14:23:53.745+0000 I  CONTROL  [initandlisten] 
2022-06-26T14:23:53.745+0000 I  CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2022-06-26T14:23:53.745+0000 I  CONTROL  [initandlisten] **        We suggest setting it to 'never'
2022-06-26T14:23:53.745+0000 I  CONTROL  [initandlisten] 
2022-06-26T14:23:53.745+0000 I  CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2022-06-26T14:23:53.745+0000 I  CONTROL  [initandlisten] **        We suggest setting it to 'never'
2022-06-26T14:23:53.745+0000 I  CONTROL  [initandlisten] 
---
Enable MongoDB's free cloud-based monitoring service, which will then receive and display
metrics about your deployment (disk utilization, CPU, operation statistics, etc).

The monitoring data will be available on a MongoDB website with a unique URL accessible to you
and anyone you share the URL with. MongoDB may use this information to make product
improvements and to suggest MongoDB products and deployment options to you.

To enable free monitoring, run the following command: db.enableFreeMonitoring()
To permanently disable this reminder, run the following command: db.disableFreeMonitoring()
---

MainRepSet:PRIMARY> db.getName();
admin
MainRepSet:PRIMARY> exit

补充: 验证登录方式

root@mongodb-cluster-0:/# mongo
MongoDB shell version v4.2.21
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("0cd67115-a016-4a69-82a6-99ba3fa74b54") }
MongoDB server version: 4.2.21
MainRepSet:PRIMARY> db.getSiblingDB('admin').auth("root", "liuchang123456");

MainRepSet:PRIMARY> db.getName();
test
MainRepSet:PRIMARY> exit

5 mongodb复制集测试

5.1 将数据插入 mongodb-cluster-0 pod

root@mongodb-cluster-0:/# mongo --host mongodb-cluster-0.mongodb-cluster.mongodb-cluster.svc.cluster.local \
--port 27017 -uroot -p'liuchang123456' admin

MainRepSet:PRIMARY> use master_slave_test
switched to db master_slave_test

MainRepSet:PRIMARY> function add(){var i = 0;for(;i<7;i++){db.persons.insert({"name":"master_slave_test"+i})}}
MainRepSet:PRIMARY> add()

MainRepSet:PRIMARY> db.persons.find()
{ "_id" : ObjectId("62b87c308c229e35afd84e63"), "name" : "master_slave_test0" }
{ "_id" : ObjectId("62b87c308c229e35afd84e64"), "name" : "master_slave_test1" }
{ "_id" : ObjectId("62b87c308c229e35afd84e65"), "name" : "master_slave_test2" }
{ "_id" : ObjectId("62b87c308c229e35afd84e66"), "name" : "master_slave_test3" }
{ "_id" : ObjectId("62b87c308c229e35afd84e67"), "name" : "master_slave_test4" }
{ "_id" : ObjectId("62b87c308c229e35afd84e68"), "name" : "master_slave_test5" }
{ "_id" : ObjectId("62b87c308c229e35afd84e69"), "name" : "master_slave_test6" }

MainRepSet:PRIMARY> exit

5.2 在 mongodb-cluster-1 pod 中验证数据

root@mongodb-cluster-0:/# mongo --host mongodb-cluster-1.mongodb-cluster.mongodb-cluster.svc.cluster.local \
--port 27017 -uroot -p'liuchang123456' admin
MainRepSet:SECONDARY> db.getMongo().setSecondaryOk()

MainRepSet:SECONDARY> use master_slave_test
switched to db master_slave_test

MainRepSet:SECONDARY> db.persons.find()
{ "_id" : ObjectId("62b87c308c229e35afd84e63"), "name" : "master_slave_test0" }
{ "_id" : ObjectId("62b87c308c229e35afd84e64"), "name" : "master_slave_test1" }
{ "_id" : ObjectId("62b87c308c229e35afd84e67"), "name" : "master_slave_test4" }
{ "_id" : ObjectId("62b87c308c229e35afd84e66"), "name" : "master_slave_test3" }
{ "_id" : ObjectId("62b87c308c229e35afd84e69"), "name" : "master_slave_test6" }
{ "_id" : ObjectId("62b87c308c229e35afd84e65"), "name" : "master_slave_test2" }
{ "_id" : ObjectId("62b87c308c229e35afd84e68"), "name" : "master_slave_test5" }

MainRepSet:SECONDARY> exit
root@mongodb-cluster-0:/# exit

5.3 验证PVC

1 删除整个mongodb副本集的pod

[root@k8s-master1 mongodb-cluster]# kubectl delete -f mongodb-statefulset.yaml
service "mongodb-cluster" deleted
statefulset.apps "mongodb-cluster" deleted

[root@k8s-master1 mongodb-cluster]# kubectl get all -n mongodb-cluster -o wide
No resources found in mongodb-cluster namespace.

注意: 这里只是删除了mongodb副本集的pod和service，对应的pvc、pv、存储并没有被删除。 当重建pod时会重新占用对应的pvc, 因为pvc中使用了pod的名字，而statefulset又保持了pod的名称固定不变

2 重新创建mongodb副本集的pod

[root@k8s-master1 mongodb-cluster]# kubectl apply -f mongodb-statefulset.yaml 
service/mongodb-cluster created
statefulset.apps/mongodb-cluster created

[root@k8s-master1 mongodb-cluster]# kubectl get all -n mongodb-cluster -o wide

3 验证mongodb副本集的数据

[root@k8s-master1 mongodb-cluster]# kubectl exec -it pod/mongodb-cluster-0 -n mongodb-cluster -- bash
root@mongodb-cluster-0:/# mongo --host mongodb-cluster-0.mongodb-cluster.mongodb-cluster.svc.cluster.local \
--port 27017 -uroot -p'liuchang123456' admin

MainRepSet:PRIMARY> use master_slave_test
switched to db master_slave_test

MainRepSet:PRIMARY> db.persons.find()
{ "_id" : ObjectId("62b87c308c229e35afd84e63"), "name" : "master_slave_test0" }
{ "_id" : ObjectId("62b87c308c229e35afd84e64"), "name" : "master_slave_test1" }
{ "_id" : ObjectId("62b87c308c229e35afd84e65"), "name" : "master_slave_test2" }
{ "_id" : ObjectId("62b87c308c229e35afd84e66"), "name" : "master_slave_test3" }
{ "_id" : ObjectId("62b87c308c229e35afd84e67"), "name" : "master_slave_test4" }
{ "_id" : ObjectId("62b87c308c229e35afd84e68"), "name" : "master_slave_test5" }
{ "_id" : ObjectId("62b87c308c229e35afd84e69"), "name" : "master_slave_test6" }

MainRepSet:PRIMARY> exit
bye

root@mongodb-cluster-0:/# exit

5.4 验证集群化

删除 mongodb-cluster-0 pod 并继续检查 rs.status()，最终剩下的两个节点中的一个节点将成为 PRIMARY。

6 mongodb副本集数据备份

只要连接到mongodb副本集中的任意一个pod都可以实现mongodb的数据备份，那么怎样才能连接上呢，这里提供两种思路。
(1) 在k8s集群中找一个节点，修改"/etc/resolv.conf"文件，将k8s集群的dns域名解析配置放到首位即可。
(2) 添加一个类型为nodePort的service，这样k8s的每个节点上都会有"27017"监听端口。

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