The concept of data movement lies at the heart of Apache CouchDB. CouchDB’s replication protocol lets developers synchronize copies of their data to remote CouchDB-based systems – including Cloudant – at the push of a button. Replication jobs can also run continuously, and in both directions.

1. Lab: Replication (30 minutes)
Bradley Holt, Developer Advocate
Thursday, February 9, 2017
CouchDB Developer Day
@BradleyHolt

2. Peer-to-Peer Replication
@BradleyHolt
Cloudant SyncCouchDB PouchDB
CouchDB Replication Protocol
CouchDB

3. http-console
$ npm install http-console -g
@BradleyHolthttps://github.com/cloudhead/http-console

4. http-console
$ npm install http-console -g
$ http-console 127.0.0.1:5984
@BradleyHolthttps://github.com/cloudhead/http-console

5. http-console
$ npm install http-console -g
$ http-console 127.0.0.1:5984
> http-console 0.6.3
> Welcome, enter .help if you're lost.
> Connecting to 127.0.0.1 on port 5984.
@BradleyHolthttps://github.com/cloudhead/http-console

6. Connecting to CouchDB 2.0
$ http-console root:passw0rd@127.0.0.1:5984 --json
@BradleyHolt

7. Connecting to CouchDB 2.0
$ http-console root:passw0rd@127.0.0.1:5984 --json
> http-console 0.6.3
> Welcome, enter .help if you're lost.
> Connecting to 127.0.0.1 on port 5984.
@BradleyHolt

8. Connecting to IBM Cloudant
$ http-console https://bradley-holt:passw0rd@bradley-holt.cloudant.com --json
@BradleyHolt

9. Connecting to IBM Cloudant
$ http-console https://bradley-holt:passw0rd@bradley-holt.cloudant.com --json
> http-console 0.6.3
> Welcome, enter .help if you're lost.
> Connecting to bradley-holt.cloudant.com on port 443.
@BradleyHolt

10. Replication
/>
@BradleyHolt

11. Replication
/> POST /_replicate
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12. Replication
/> POST /_replicate
...
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13. Replication
/> POST /_replicate
... { "create_target": true, "source": "https://bradley-holt.cloudant.com/kittens", "target": "kittens" }
@BradleyHolt

14. Replication
/> POST /_replicate
... { "create_target": true, "source": "https://bradley-holt.cloudant.com/kittens", "target": "kittens" }
HTTP/1.1 200 OK
Content-Type: application/json
{
ok: true,
session_id: '9f7bd286a0001ece5bf0bf65dd83c5ab',
source_last_seq: '5-
g1AAAAFDeJzLYWBgYMlgTmGQT0lKzi9KdUhJMtVLykxPyilN1UvOyS9NScwr0ctLLckBKmRKZEiy____f1
YiA6oWQ9xakhyAZFI9SFcGcyJzLpDHbplmZmxkaULYBKIdlscCJBkagBTQov2kuA-
i8wBEJ9iNTGA3mhoampmnGBA2JQsA1LtoyA',
…
}
@BradleyHolt

16. Try It On Your Own
1. Create database test_1
2. Create database test_2
3. Set up continuous replication from the test_1 database to the test_2 database
4. Create a document in the test_1 database
5. Confirm that the document has been replicated to the test_2 database
6. Delete the test_1 and the test_2 databases
@BradleyHolt

17. Lab: Replication
CouchDB Developer Day
@BradleyHolt