Code-free
Code-free

Resize problems

Kalle Happonen

Geek. Systems Specialist @CSCfi

February 26, 2018

It's a while since the last blog. For some reason the technial blog posts stopped at the same time I took the product owner hat. Interpret that as you may.

Normal disclaimer: CentOS 7, RDO on OpenStack Newton

I can't resize!

Resizing and migrating VMs are some of the standard tools in the OpenStack arsenal . Resizing is often liked by . . .

Read More

Rally and Tempest

Or: your cloud probably has problems

Kalle Happonen

Geek. Systems Specialist @CSCfi

July 20, 2017

When you operate a complex system, like OpenStack, one of the most important things is to know the state of the system. What works, what's broken and what's broken for a known reason. Without this information it's really hard to make changes to the system.

I think pretty much all OpenStack installations have their own way of . . .

Read More

Liberty to Newton

Sorry Mitaka

Kalle Happonen

Geek. Systems Specialist @CSCfi

May 31, 2017

Here's my traditional OpenStack upgrade blog post. I usually write these after all of our major OpenStack upgrades.

Our stack: CentOS 7, RDO, Puppet + Ansible, Linuxbridges + VLAN, Ceph

We're a dinosaur who still has monolithic API nodes (Most services running on a pair of VMs), which is relevant for this procedure.

Credit where . . .

Read More

Packets - Part 2

Kalle Happonen

Geek. Systems Specialist @CSCfi

May 16, 2017

Some time back, I wrote a post about hunting down dropped packets on our network nodes. Here's a small follow up with some performance hints.

More problems

My happy glow after fixing the previous issue didn't last for long. Our network nodes had hit the next problem.

Our network nodes are virtualized for management simplicity. The . . .

Read More

Logical Volume Management

Or: Paying the Price for Technical Debt

Kalle Happonen

Geek. Systems Specialist @CSCfi

March 16, 2017

We have run OpenStack for a while. I think we went into production around Grizzly. Back then we were new to running production OpenStack systems (who wasn't?). This means we made some decisions back then, which we are still paying for.

Credit where credit is due: Almost all the real work described in this post was done by my colleagues, . . .

Read More

Packets, Drop by Drop

Kalle Happonen

Geek. Systems Specialist @CSCfi

January 30, 2017

I originally started writing this blog to document all the tricky bugs I encountered, and google couldn't answer.

My, did I ever find one. And it wasn't one of the issues that makes you go beat yourself for not figuring it out sooner.

Network, gross work

We had a simple change in our cloud infrastructure. We were changing our routers. . . .

Read More

Yubikey, ibikey, let'sallbikey!

Kalle Happonen

Geek. Systems Specialist @CSCfi

November 14, 2016

SSH is one of the most important tools I use. It has tons of cool features for the power user. First off any serious use needs SSH keys and ssh-agent to go with that. Socks proxy forwarding is super powerful, as is SSH mutlihop. GitHub works nicely with SSH, and Ansible builds on SSH. And when you use Ansible, you probably want to throw in . . .

Read More

Archive
  Subscribe by Email and Never Miss a Post