For those that don’t follow the ARIN Public Policy Mailing List, the following is excerpted from a post by Thomas Narten in response to the announcement that the IESG has approved a new document to replace the existing RFC 3177 (IPv6 Address Assignment to End Sites).

> The IESG has approved the following document:
> – ‘IPv6 Address Assignment to End Sites’
> (draft-ietf-v6ops-3177bis-end-sites-01.txt) as a BCP

Quoting from the Introduction:

This document obsoletes RFC 3177, updating its recommendations in the following ways:

1) It is no longer …

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A special extended edition of Tech Messages for 2010-12-14 through 2010-12-21:

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  Still annoying…
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…

Ignacio Nin and I (mostly Ignacio) have worked together to create tcprstat[1], a new tool that times TCP requests and prints out statistics on them. The output looks somewhat like vmstat or iostat, but we’ve chosen the statistics carefully so you can compute meaningful things about your TCP traffic.

What is this good for? In a nutshell, it is a lightweight way to measure response times on a server such as a database, memcached, Apache, and so on. You can use this information for historical metrics, capacity planning, troubleshooting, and monitoring to name just a few.

The tcprstat tool itself is a means of gathering raw statistics, which are suitable for storing and manipulating with other programs and scripts. By default, tcprstat works just like vmstat: it runs once, prints out a line, and exits. You’ll probably want to tell it to run forever, and continue to print out more lines. Each line contains a timestamp and …

What makes you think jdbc autoreconnect is needed?
Application is idle for long periods at a time?
Wait_timeout too short?
Network failure or glitches?

Some good suggestions form Mark Matthews - Bug #5020

Having encountered the problem again myself today, trying to make jdbc for mysql reconnect any terminated connections using autoreconnect=true I figured out a way to work it out from the pooling side.


Introduction to the problem:

On the mysql side wait_timeout is set to default 8hrs and any connections idle for longer than that were beomg terminated despite setting the connection string to: url=jdbc:mysql://localhost:3306/dbname?autoReconnect=true. The application was thence throwing an exception.

The solution was to introduce a ping from the pooler which for “Ibatis”, the pooler technology used …

A special extended edition of Tech Messages for 2010-04-29 through 2010-05-14:

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A MySQL is running happily on a machine situated in a land far far away. I grant access to a user@machine_aaaaaa (grant select on db.* to ‘user’@'machine_aaaaa’ identified by ‘password’; flush privileges;), send an email to the user saying it should run fine and happily go off my way. Mistake!

It seems this user can’t connect to the mysql gets access denied:
Access denied for user ‘user’@'machine_bbbbb’ (using password: YES)

Note that the machine the user is being seen from is totally different from the one I set up in the grant!! WHY?

run a reverse lookup on the ip of machine_aaaaa, turns out it shows machine_bbbbb. So I figure a big bad guy messed up /etc/hosts, I was right! `cat /etc/hosts` just to find an entry for machine_aaaaa blehh

Ok, solution is to remove the entry from /etc/hosts (after finding out it wasn’t even necessary and wasn’t even supposed to be there in the first …

I was warned by my brother a while ago that should I start tweeting, he would stage an intervention. I had already confessed to accounts with facebook, multiply, myspace, and several others (disclaimer/explanation: all of those sites are customers of my longtime employer). Twitter, to the uninitiated, looks like the crack cocaine of social networking that turns the weekend photo-poster into a hardcore jittering lifecaster. Nobody wants to see their family member come to that, right? But follow along, twitter has purpose. Or just skip to the bottom.

 I was never an active friendster user. The first site I used …

I was warned by my brother a while ago that should I start tweeting, he would stage an intervention. I had already confessed to accounts with facebook, multiply, myspace, and several others (disclaimer/explanation: all of those sites are customers of my longtime employer). Twitter, to the uninitiated, looks like the crack cocaine of social networking that turns the weekend photo-poster into a hardcore jittering lifecaster. Nobody wants to see their family member come to that, right? But follow along, twitter has purpose. Or just skip to the bottom.

 I was never an active friendster user. The first site I used …