Install MongoDB on Linux

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Install guide

https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/#install-mongodb-community-edition

Start MongoDB
sudo service mongod start


~$ mongo
MongoDB shell version v4.0.4
connecting to: mongodb://127.0.0.1:27017
Implicit session: session { "id" : UUID("9d29ae49-0a6b-4b7a-b6b2-2b4b569362d6") }
MongoDB server version: 4.0.4
Server has startup warnings: 
2018-11-18T22:44:34.298+0900 I STORAGE  [initandlisten] 
2018-11-18T22:44:34.298+0900 I STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2018-11-18T22:44:34.298+0900 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2018-11-18T22:44:35.355+0900 I CONTROL  [initandlisten] 
2018-11-18T22:44:35.355+0900 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-11-18T22:44:35.355+0900 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2018-11-18T22:44:35.355+0900 I CONTROL  [initandlisten] 
2018-11-18T22:44:35.356+0900 I CONTROL  [initandlisten] 
2018-11-18T22:44:35.356+0900 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2018-11-18T22:44:35.356+0900 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-11-18T22:44:35.356+0900 I CONTROL  [initandlisten] 
2018-11-18T22:44:35.356+0900 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2018-11-18T22:44:35.356+0900 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-11-18T22:44:35.356+0900 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()
---



https://docs.mongodb.com/manual/tutorial/transparent-huge-pages/#transparent-huge-pages-thp-settings

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mongoDB admin 권한 설정방법 How to enable access control for mongo DB

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** WARNING: Access control is not enabled for the database. ** Read and write access to data and configuration is unrestricted. 해결방법 Solution 요약 : mongoDB를 설치하면 기본적으로 admin이라는 db가 생성됩니다. 이 admin db에 앞으로 생성할 db와 user를 관리할 수 있는 administrator 계정을 생성합니다. 그리고 나서 administrator 계정을 통해 작업할 db와 그 db에 접근 가능한 user 계정을 만듭니다. 이후 user 계정으로 접속해 db 작업을 진행합니다. // How to enable access control for  mongo DB $ mongo connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.4.10 Server has startup warnings: 2018-01-12T09:03:22.199+0900 I CONTROL  [initandlisten] 2018-01-12T09:03:22.199+0900 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database. 2018-01-12T09:03:22.199+0900 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted. 2018-01-12T09:03:22.199+0900 I CONTROL  [initandlisten] // db list > show dbs admin 0.000GB local 0.000GB // Create the User Administrator &
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