Elasticsearch不断覆盖ebs卷上的现有数据

Question

I have an aws instance running ELK server on it, with an EBS attached. All mamanged by Terraform.

Elasticsearch's path.data is pointed towards the mounted dir of EBS. Data is stored as /ebs_vol/nodes/0/indices . Works perfectly fine.

The Problem:

When I destroy and re-create the instance (with Terraform), the ELK server is all set BUT it overwrites the /ebs_vol/nodes/0/indices and all the data present in elasticsearch before destroy/create is gone now.

Expected:

After aws_instance destroy/create elasticsearch data should persist.

It would be great if someone can help!

Answer 1

The problem was with the ec2 instance start script which before mounting the EBS volume created a file system on it sudo mkfs.ext4 and it wiped all the existing content.

Hence I have done that dynamically now;

if sudo mount -a ; then
    echo "Mount succeeded"
else
    echo "Mount failed"
    sudo mkfs.ext4 $EBS_DEVICE
    sudo mount -a
fi