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Read the original article at Cloud Deployment Interview
What does a cloud computing expert need to know? In part one of the cloud interview guide we covered some basic unix & Linux systems administration skills, and cloud computing and infrastructure concepts. Those are key starting points. You might also want to jump to part 3 cloud dba, architecture and management interview questions.
In this second part, let’s dig into deploying applications in the cloud, and day to
[Read more...]When your backup script is running for too long it sometimes causes the second backup script starting at the time when previous backup is still running. This increasing pressure on the database, makes server slower, could start chain of backup processes and in some cases may break backup integrity.
Simplest solution is to avoid this undesired situation by adding locking to your backup script and prevent script to start second time when it’s already running.
Here is working sample. You will need to replace “sleep 10″ string with actual backup script call:
#!/bin/bash
LOCK_NAME="/tmp/my.lock"
if [[ -e $LOCK_NAME ]] ; then
echo "re-entry, exiting"
exit 1
fi
### Placing lock file
touch $LOCK_NAME
echo -n "Started..."
### Performing required work [Read more...]
If you ever get an error with MySQL client library:
php: error while loading shared libraries: libmysqlclient.so.16: cannot open shared object file: No such file or directory
while using Percona MySQL Server 5.5 just go ahead and install Percona-Server-shared-compat package from Percona Repo:
yum install Percona-Server-shared-compat
Read the original article at How to hire a developer that doesn’t suck
Strip by Randall Munroe; xkcd.com
First things first. This is not meant to be a beef against developers. But let’s not ignore the elephant in the living room that is the divide between brilliant code writers and the risk averse operations team.
It is almost by default that developers are disruptive with their creative coding while the guys in operations, those who deploy the code, constantly cross their fingers in the hope that application changes won’t tilt the machine. And when you’re woken up at 4am to deal with an outage or your sluggish site is costing millions in losses,
[Read more...]Disclaimer: the information in this post is the author’s personal opinion and is not the opinion or policy of his employer.
It was spring 2010 when we decided that even though Softlayer‘s server provisioning system is really great and it takes only a few hours to get a new server when we need it, it is still too long sometimes. We wanted to be able to scale up when needed and do it faster. It was especially critical because we were working hard on bringing up Facebook integration to our site and that project could have dramatically changed our application servers cloud capacity requirements.
What buzzword comes to your mind when we talk about scaling up really fast, sometimes within minutes, not hours or days? Exactly – cloud computing! So, after some initial testing and playing around
[Read more...]So your not a MySQL DBA, but you have to perform like one. If you have a production environment that’s running now, what are the first things you do when it’s not running or reported as not running?
After you do this manually more then
[Read more...]Scribd is a top 100 site on the web and one of the largest sites built using Ruby on Rails. As one of the first rails sites to reach scale, we’ve built a lot of infrastructure and solved a lot of challenges to get Scribd to where it is today. We actively try to push the envelope and have contributed substantial work back to the open source community.
Scribd has an agile, startup culture and an unusually close working relationship between engineering and ops. You’ll regularly find cross-over work at Scribd, with ops people writing application-layer code and engineers figuring out operations-level problems. We think we’re able to make that work because of the uniquely talented people we have on the team.
To allow us to keep scaling, we’re now looking to add a
[Read more...]
Web Operations
Web Operations. By John Allspaw and Jesse Robbins, O’Reilly 2010, with a chapter by myself. (Here’s a link to the publisher’s site).
I wrote a chapter for this book, and it’s now on shelves in bookstores near you. I got my dead-tree copy today and read everyone else’s contributions to it. It’s a good book. A group effort such as this one is necessarily going to have some differences in style and even overlapping content, but overall it works very well.
[Read more...]If there's a site that exemplifies explosive growth, it has to be Twitter. It seems like everywhere you look, someone is Tweeting, or talking about Tweeting, or Tweeting about Tweeting. Keeping the site responsive under that type of increase is no easy job, but it's one that John Adams has to deal with every day, working in Twitter Operations. He'll be talking about that work at O'Reilly's Velocity Conference, in a session entitled Fixing Twitter: Improving the Performance and Scalability of the World's Most Popular Micro-blogging Site, and he spent some time with us to talk about what is involved in keeping the site alive.
James Turner: Can you start by
[Read more...]
I just made my reservations to attend Velocity Conference in Burlingame, CA. Velocity is a new two day conference being organized by O'Reilly. I was happy to learn at Lunch today that one of my good friends from CafeMom will also be attending. Over at Facebook I see Don McAskill has RSVP'd for the event as well.| Showing entries 1 to 11 |