The failover can be execute by changing the IP address for a given host name. This means a A record has to be introducted or modified.
This can be done through a CLI command. The information required is:
- Route53 hosted zone id: for example HOSTED-ZONE-ID
- name of entry: for example myservice
- IP address for entry: for example 10.79.252.13
- domain name: for example myvpc.mycompany.com
- Time to life (TTL): for example 10s
Find your hosted zone through using the AWS console or the AWS CLI command:
aws route53 list-hosted-zones
Create a file like change-resource-record-sets.json:
"Comment": "Update record to reflect new IP address for a system ",
Replace the string myservice.myvpc.mycompany.com with the host name and the domain which matches your requirements.
Replace 10.79.252.13 with the IP address where your service is being provided.
Changing the A record in Route53
Use the following AWS CLI command to implement the change:
aws route53 change-resource-record-sets --hosted-zone-id HOSTED-ZONE-ID --change-batch file:///mypath/change-resource-record-sets.json
Replace HOSTED-ZONE-ID with the identifier for your hosted zone. Pick the correct path to your json configuration file.
This command can be used to create an A record initially. It will work as well if the record already exists. It will then update the IP address and the TTL value.
The command will return a transaction Id which should be caught...
Checking Progess of the Update
The Route53 update takes as while (~20s). The successfull completion of the transaction can be checked with the following command:
aws route53 get-change --id <value>
The result will provide a status field which is PENDING or INSYNC.
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