记录一次docker集群中搭建mongodb副本集

1.创建三个装有mongo的docker容器，这里使用docker-compose，配置如下

mongo:
    image: mongo
    command: mongod -f /etc/mongo.conf
    volumes:
      - ${DATA_PATH_HOST}/mongo:/data/db
      - ${CONF_PATH}/mongo/mongo_yaml.conf:/etc/mongo.conf
      - ${CONF_PATH}/mongo/access.key:/etc/access.key
    expose:
      - 27017
    ports:
      - 27017:27017
    networks:
      - backend

mongo2:
    image: mongo
    command: mongod -f /etc/mongo.conf
    volumes:
        - ${DATA_PATH_HOST}/mongo2:/data/db
        - ${CONF_PATH}/mongo/mongo_yaml.conf:/etc/mongo.conf
        - ${CONF_PATH}/mongo/access.key:/etc/access.key
    expose:
        - 27017
    ports:
        - 27018:27017
    networks:
        - backend

mongo3:
    image: mongo
    command: mongod -f /etc/mongo.conf
    volumes:
        - ${DATA_PATH_HOST}/mongo3:/data/db
        - ${CONF_PATH}/mongo/mongo_yaml.conf:/etc/mongo.conf
        - ${CONF_PATH}/mongo/access.key:/etc/access.key
    expose:
        - 27017
    ports:
        - 27019:27017
    networks:
        - backend

其中mongo.conf 为yaml格式的mongodb配置文件，内容如下

processManagement:
   fork: false
net:
   bindIp: 127.0.0.1
   port: 27017
storage:
   dbPath: /data/db
systemLog:
   #destination: file
   #path: log/mongo27017.log
   logAppend: true
storage:
   journal:
      enabled: true
replication:
   oplogSizeMB: 500
   replSetName: "r1"
   secondaryIndexPrefetch: "all"

执行docker-compose up -d mongo mongo2 mongo3 创建三个mongo容器 并指定副本集 r1

2. 登入任意一台机器的MongoDB执行：因为是全新的副本集所以可以任意进入一台执行；要是有一台有数据，则需要在有数据上执行；要多台有数据则不能初始化。我个人是mongo中有数据但是mongo2和mong3是空的数据库，所以我登录mongo1进行副本集初始化。

    执行命令 docker-compose exec mongo bash 进入容器

    执行命令  mongo  在容器内部连接mongo

    执行一下命令初始化副本集

> use admin
switched to db admin
> config = { "_id": "r1", "members": [{ "_id": 0, "host": "mongo:27017", "priority": 1 }, { "_id": 1, "host": "mongo2:27017", "priority": 1 }, { "_id": 2, "host": "mongo3:27017", "priority": 1 }] }
{
	"_id" : "r1",
	"members" : [
		{
			"_id" : 0,
			"host" : "mongo:27017",
			"priority" : 1
		},
		{
			"_id" : 1,
			"host" : "mongo2:27017",
			"priority" : 1
		},
		{
			"_id" : 2,
			"host" : "mongo3:27017",
			"priority" : 1
		}
	]
}
> rs.initiate(config)
{
	"ok" : 1,
	"operationTime" : Timestamp(1539830924, 1),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1539830924, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}

副本集初始化完成，可以使用命令rs.status()查看当前副本集状态，至此mongodb副本集设置完成

3.加入鉴权机制，如果服务端需要开启auth认证，则在启动时通过keyFile三个节点之间的通信授权

使用命令生成keyFile文件

openssl rand -base64 745 > /docker/conf/mongo/mongo-keyfile

ch

如果服务器启动时加入了参数--keyFile = /docker/conf/mongo/mongo-keyfile  则mongo服务端启动时会自动开启auth，故应先创建账号。
创建了账号  root   pass  auth库为admin  （步骤省略）

停止所有节点，重新启动mongo服务，并加上 --keyFile参数

发现报错

mongo3_1     | 2018-10-24T06:13:06.323+0000 I CONTROL  [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'

mongo3_1     | 2018-10-24T06:13:06.331+0000 I ACCESS   [main] permissions on /etc/access.key are too open

mongo2_1     | 2018-10-24T06:13:06.591+0000 I CONTROL  [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'

mongo2_1     | 2018-10-24T06:13:06.605+0000 I ACCESS   [main] permissions on /etc/access.key are too open

mongo_1      | 2018-10-24T06:13:06.609+0000 I CONTROL  [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'

mongo_1      | 2018-10-24T06:13:06.614+0000 I ACCESS   [main] permissions on /etc/access.key are too open

这是因为keyfile权限问题，执行命令将keyfile权限设置为600

chmod 600 /docker/conf/mongo/access.key

再次启动，成功。

进入某一容器执行副本集链接操作，系统提示已成功连接到副本集