sqldump is a tumblelog.

Twitter API: 401 Unauthorized

Symptom: Twitter API returns a 401 Unauthorized when you start the OAuth process by obtaining a bearer token. This can happen all of a sudden possibly breaking existing processes that were working.

Wat?

Problem: The most likely culprit is the clock on your server. If this gets out of sync (even by as little as 20s), Twitter’s amazing API will barf and return a helpful “401 Unauthorized”

Solution: A simple

sudo ntpdate ntp.ubuntu.com

should fix it.

MongoDB 2.4.0 EXT4 Readahead Warnings

After deploying MongoDB 2.4.0 for the first time and connecting to it from a remote shell, it warned me:

MongoDB shell version: 2.4.0
connecting to: abc.com/test
Server has startup warnings:
Wed Mar 20 22:40:49.850 [initandlisten]
Wed Mar 20 22:40:49.850 [initandlisten] ** WARNING: Readahead for /data/db is set to 2048KB
Wed Mar 20 22:40:49.850 [initandlisten] ** We suggest setting it to 256KB (512 sectors) or less
Wed Mar 20 22:40:49.850 [initandlisten] ** http://dochub.mongodb.org/core/readahead
>

The fix for this turned out to be:

sudo blockdev --setra 256 /dev/md2

Where /dev/md2 is the disk where the database files are stored.