Category: Cloud

Percona XtraDB Cluster On CentOS

November 14, 2013

This article is built off of a similar article we published last month: Percona XtraDB Cluster on Ubuntu The primary difference is this time we’re going to use CentOS instead of Ubuntu. In this article we’re going to build a Percona XtraDB Cluster using a pair of RackSpace Cloud Servers. Percona XtraDB Cluster is a MySQL compatible replacement supporting multi-master replication. For this project we’ll use the latest CentOS release and we’re going to use RackSpace Cloud Networks to setup an isolated segment for the replication between the cluster nodes. We’ll do two nodes in the cluster but you can add additional nodes as desired. Finally we’ll use a RackSpace Cloud Load Balancer to distribute traffic between the nodes. To get started, create the cloud servers from the RackSpace control panel using the following guidelines: Make sure you choose a Next Gen region for the servers. For the Image choose

Export Zone From RackSpace Cloud DNS

November 6, 2013

Here’s a very useful Python utility that can be used to list, export and import zones from RackSpace Cloud DNS: https://github.com/wichert/clouddns The install procedure is something like:

wget https://github.com/wichert/clouddns/archive/master.zip
unzip master.zip
cd clouddns-master
python setup.py install

wget https://github.com/wichert/clouddns/archive/master.zip

unzip master.zip

cd clouddns-master

python setup.py install

If all goes well then the utility will be installed to:

/usr/local/bin/clouddns

1	/usr/local/bin/clouddns

You may need to install python-setuptools before the install will run. If the utility is failing to run then you can try running it directly from the distribution at:

src/clouddns.py

1	src/clouddns.py

Command Line Tools For RackSpace Cloud Load Balancer

October 31, 2013

Great utility from managing RackSpace Cloud Load Balancers from the commandline: https://github.com/calebgroom/clb To get this Python utility running you might find this article useful: http://blogs.reliablepenguin.com/2014/05/19/python-2-7-python-3-3-centos-6

Change Timeout on RackSpace Cloud Load Balancer

October 7, 2013

Great post showing the steps needed to change the timeout on a RackSpace Cloud Load Balancer: https://community.rackspace.com/products/f/25/t/89

RackSpace Cloud Networks Bug and Interesting Notes

October 6, 2013

There’s a bug in the automation for provisioning RackSpace Cloud Servers with Cloud Networks from the control panel. If you setup a server with more then one Cloud Network, the networks get assigned to the wrong interfaces. This is not a problem if all the servers you’re connecting to the Cloud Network are created from the control panel because they will all be consistently wrong. But if some of your server are created from the API then you’ll have a problem because the API automation assigns the networks correctly. The fix, until RackSpace corrects the bug, is to manually correct the address assignments on the control panel generated cloud servers. While troubleshooting this issue, RackSpace support pointed out a couple of interesting commands: To see what your networking should be, you can run this:

xenstore-ls vm-data/networking

1	xenstore-ls vm-data/networking

And to view a specific interface run:

xenstore-read vm-data/networking/BC764E051479 | python -mjson.tool

1	xenstore-read vm-data/networking/BC764E051479 \| python -mjson.tool

This will show the config that should be

Reliable Penguin provides managed web hosting, systems administration, website and server migrations, and expert consulting.

Recent Updates

Fixing WP‑CLI “eval()’d code” Parse Errors on PHP 8.4 During “wp db import”

Force a 404 With a CloudFront Function (Always)

HTTP Basic Auth Is Dead

WordPress 6.8 Speculative Loading Can Break HTTP Basic Auth

Zero‑Trust for WordPress Admin with Cloudflare Access (Email One‑Time Codes)