Update Config files during EBS volumes swap

Question

Hi,
I set up new EC2 instance for one of our application. Database is restored from backup and I named as DB-copy. Snapshots of current EBS volumes are restored and then attached to the new EC2. This new instance gets copied like production data, call it clone. I then have to stop my application process immediately in new instance , modify the config file to change/point the db parameter to db-copy. Otherwise, my production application will fail saying there is another duplicate instance running.

I’m looking to modify the config file in the snapshot volume via console or CLI and while during volume swap that avoids me in doing manual update. Is there any guidance on achieving this?

Regards

AWS-User-1080814 · Answer

Hi,
Sorry about delayed response. I was on leave. 
What I’m trying to achieve is modify the file content from db1.AWS.com to db2.AWS.com while the volumes are swapped. In other words, can I modify the value within AWS console or CLI before I swap over the volumes ?

Ganesh Kudikala · Answer

Hello

You can use in this way:

* Create AMI from the Ec2
* Launch AMI and add **user data** to modify the config file

```
#!/bin/bash

/bin/sed -i 's/old-text/new-text/g'  configfile/path

```

please let me know if you have any questions

Thanks
GK

Update Config files during EBS volumes swap

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