将安装在 AWS EC2 实例上的 MongoDB 的存储位置设置为 EBS 存储。 以及如何在实例停止/终止后恢复它？

Question

Hello everone I am new to AWS. I have created and Instance and installed MongoDB on It. But I learned from EC2 docs that the data stored on EC2 machine destroyed once they stop or terminated. So I have to use EBS for the data storage.

On the 4th step of creating EC2-Instance I selected the volume

But I don't know how to use it. Is it automatically used by EC2-Instance to store the data in it or we have to manually do it. I know that for changing the database storage we have to change the file named mongod.conf and modify the dbpath there but I don't know what path to give there. and after that also if I destroyed that instance when I will get the EBS storage back. thanks in advance for the help.

Answer 1

In your screenshot the EBS volume is the root volume for the instance. So unless you add other volumes to the instance, everything persisted to disk on that instance is going to be stored on the EBS volume. You can pick (or create) any location to store your database.

Answer 2

After you have mounted the EBS volume correctly as per instructions here , you can use the following steps to store your data to EBS volume.

• Edit mongod.conf file.
  sudo nano /etc/mongod.conf

• Change the line dbpath=/var/lib/mongodb to the new path storage location, eg dbpath=/data/mongodb

• Update the permissions of your chosen path to allow the MongoDB user to write to it, eg chown $USER -R /home/user/data/mongodb
  In most cases you user is mongodb. So you can replace $USER with mongodb:mongodb

• Restart the service
  sudo service mongod stop then sudo service mongod start

Note, please be careful that if you have any data in the old location and you want to keep, you'll need to stop the MongoDB service first, manually move the files and then start the service again.