open:mongodb [EL]

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# MongoDB

{{tag>mongo nosql}}

## 문서

- [[MongoDB 필드 삭제]]
- [[save pickle]]
- [[Mongodb Log file]]
- [[Mongodb Repair]]
- [[Mongodb Regex]]

## 로그 파일 삭제

<code>
# /var/log/mongodb/mongod.log

sudo cp /dev/null mongod.log
</code>

## 도커에서 인증 활성화

- https://stackoverflow.com/questions/34559557/how-to-enable-authentication-on-mongodb-through-docker/43441619#43441619

### docker run


<code>
$ docker run -d --rm --name mongo_remote_container \
      -p 27000:27017 \
      -e MONGO_INITDB_ROOT_USERNAME=admin \
      -e MONGO_INITDB_ROOT_PASSWORD=secret_password \
      mongo \
      mongod --auth
</code>

<code>
docker run -d --rm --name mongo_remote_container \
  -e MONGODB_ADMIN_USER=admin \
  -e MONGODB_ADMIN_PASS=secret_admin_pa$$ \
  -e MONGODB_APPLICATION_DATABASE=mytestdatabase \
  -e MONGODB_APPLICATION_USER=testuser \
  -e MONGODB_APPLICATION_PASS=testpass \
  -p 27000:27017 aashreys/mongo-auth:latest \
</code>

<code>
db.auth('admin', 'secret_admin_pa$$')
</code>

## mongodb find

### regex

```json
db.getCollection('wine_collection').find({'name_ko': {'$regex' : ".*마르케시 디 바롤로, 사르마싸.*"}})
```

### elemMatch

```json
db.getCollection('wine_collection').find({"varieties" : {'$elemMatch' : {"$eq": "네비올로"}}})
```



## 링크

- http://dev.youngkyu.kr/23

## 특정 필드를 가지고 있는 문서 조회

```db
db.getCollection('stock_company').find({'daily_updated': {'$exists': true}}).count()
```

## 특정 필드 삭제


`$unset` 사용
`multi: true` 를 지정하여 여러 문서에 적용

<code>
db.getCollection('stock_company').update({}, {'$unset': {'daily_updated': ''}}, {'multi': true})
</code>

여러 필드를 삭제하는 경우

<code>
db.getCollection('stock_company').update({}, {'$unset': {'daily_updated': '', 'second_field': ''}}, {'multi': true})
</code>