Useful tidbits
During my day to day work I often stumble upon problems I’ve not encountered before. Usually I find solutions quickly, either by thrawling manual pages (oh ‘man’ how I love thee), StackOverflow or Google. When I discover good solutions I think to myself “must remember to share this with someone”, and then I forget all about it. This post is my attempt at rectifying that.
The things I will present are fairly trivial in themselves, and may very well be available through documentation, but have some aspect that I find worth noting. We’ll start off easy.
Today I needed to cancel one of the replications that were running between two couchdb-instances. The manual tells you that you can restart the couchdb server, since that clears the list of replication jobs. I wanted to leave the other replications running and just kill the one I really needed to die.
If you read the documentation on replication you will learn how easy it is to do it using curl.
| 1 2 3 4 5 | curl \ -X POST \ -H ‘Content-Type: application/json’ \ -d ‘ { “source”:”mydb”,”target”:”http://mytargethost.com: 5984 /mydb/”, “cancel”: true } ‘ \ http://mysourcehost.com: 5984 /_replicate |
The only problem is that this will not do anything if it is set up to be a continuous replication. To cancel a running continuous replication you have to explicity tell CouchDB that “yeah, I know what I am doing, I really do want to cancel thins continuous replication”. Like so;
| 1 2 3 4 5 | curl \ -X POST \ -H ‘Content-Type: application/json’ \ -d ‘ { “source”:”mydb”,”target”:”http://mytargethost.com: 5984 /mydb/”, “continuous”:true, “cancel”: true } ‘ \ http://mysourcehost.com: 5984 /_replicate |
Do you see the difference? I added “continuous”:true to the json structure. That’s really all there is to it!
Stay tuned for more of these. I’ll try to update on a day to day basis.