What a n00b! » How-Tos / Tips

Time Machine Backups from Airport Extreme

Wyatt Walter — Fri, 11 Nov 2011 06:06:36 +0000

Hopefully Apple doesn’t make up some way to disable this in the future, but it seems that despite claims elsewhere on the web, the latest Airport Extreme can be used with a USB hard drive to perform Time Machine backups. I’ve always heard great things about the Airport devices and really wanted to do backups over it, but I already had a larger USB hard drive, so a Time Capsule seemed like a bit of a waste. This worked with an Airport Extreme 802.11n 5th generation. My Macs are both Lion and Snow Leopard.

All you have to do is first plug the hard drive directory into your Mac, partition as desired and format filesystems as an HFS (Mac OS Extended). Then, plugin the drive and enable disk sharing on the Airport. After that’s done, your Aiport should show up in Finder. Once you mount it, you can select it from the Time Machine settings (it will appear as a Time Capsule).

That’s it! Glad I found out and wasn’t deterred by what Apple says and is on their forums. The Airport has been amazing, video streaming is far smoother now unlike with the aging wireless router I was replacing. Definitely a recommended buy!

Launching Ubuntu 11.04 Instances on KVM

Wyatt Walter — Mon, 24 Oct 2011 06:09:44 +0000

This post is mostly for my own record as I keep having to look at my shell history every time I want to spin up a new virtual machine on my KVM server at home (so for those looking for something earth shattering, move along). For anyone looking for a how-to to get started, I followed an entry over a howtoforge. It’s pretty good, so no need to replicate.

Now, the goods.

If this is your first image, I recommend looking for the section in the page referenced titled “3 Creating An Image-Based VM” (seems no way to link to specific sections..). For me, I just copy one of the dirs from an existing one and clear out the ubuntu-kvm dir and edit vmbuilder.partition as necessary.

Then, from that dir, run:
sudo vmbuilder kvm ubuntu --suite=natty --flavour=virtual --arch=amd64 -o --libvirt=qemu:///system --ip=172.16.0.10 --templates=mytemplates --user=wyatt --name=Wyatt --pass=supersecret --addpkg=vim-nox --addpkg=unattended-upgrades --addpkg=acpid --addpkg=openssh-server --firstboot=/home/user/host.whatan00b.com/boot.sh --mem=1024 --hostname=host.whatan00b.com --bridge=br0 --part=vmbuilder.partition

Then, start the vm:
sudo virsh start host.whatan00b.com

It should boot shortly and you can ssh to the shiny new vm with the IP and username/password specified. Hopefully soon I can find some fancy way to integrate Puppet into the mix.

Vagrant Fails To Start VM with Bad Default Machine Folder

Wyatt Walter — Fri, 23 Sep 2011 07:00:21 +0000

I’m here at PuppetConf in Portland and one of the speakers got me all excited again about Vagrant. I’ve played around with Vagrant before, but he was showing off some awesome features that I didn’t realize existed which made me want to play with the tool again (more on that later!). Anyway, I updated all the versions of things Vagrant-related and tried to use it again. However, when I downloaded one of the default images from the getting started page I was greeted with an awesomely descriptive error:

[default] Importing base box 'lucid32'... The VM import failed! Try running `VBoxManage import` on the box file manually for more verbose error output.

Running it with VBoxManage as instructed gave a slightly-better-yet-not-so-useful error:
VBoxManage: error: Appliance file must have .ovf extension VBoxManage: error: Details: code VBOX_E_FILE_ERROR (0x80bb0004), component Appliance, interface IAppliance, callee nsISupports Context: "Read(Bstr(pszAbsFilePath).raw(), progressRead.asOutParam())" at line 302 of file VBoxManageAppliance.cpp

A few Google searches for this error got me almost nowhere except that it was likely a VirtualBox configuration issue. Great. After digging around for far too long, I figured out that it was because when I had played with Vagrant/VirtualBox in the past I had configured VirtualBox’s default machine folder to an external drive that I didn’t have plugged in! Doh. Anyway, was a pretty easy fix but I thought I’d share if it saved someone some time. The default machine folder is set on the first screen in the VirtualBox preferences window (at least for me on my Mac).

Enabling Tab Complete for Python Shell on OS X

Wyatt Walter — Mon, 30 May 2011 15:02:18 +0000

I have been struggling with an issue for a bit while trying to get tab completion working on the python shell on OS X. I’ve been working on a Django project and not being able to tab complete has been a bit obnoxious. It took a few sessions of searching around to find out what’s going on, so I thought I’d share it in one place. Turns out that the default shell settings are ready to go with tab complete (I spent a lot of time making sure configs were correct), but OS X simply doesn’t ship GNU readline. Instead, Apple just symlinked BSD libedit which is problematic because the default python readline module links to GNU readline.

Someone has already created an egg with readline statically linked just for OS X so the fix is super-easy. Just install the standalone readline module with your favorite python installer. I used:
sudo easy_install readline

SugarCRM Chef Cookbook Published

Wyatt Walter — Sun, 01 May 2011 05:41:32 +0000

After delaying cleanup on the code for a week or two, I’ve published my cookbook for deploying SugarCRM CE using Opscode Chef. The cookbook utilizes the community cookbooks from Opscode for deploying the standard LAMP stack on a machine, grabs a copy of the latest stable build of SugarCRM CE from Github, and creates a silent installer file for super-easy installation of SugarCRM.

Some quick notes on setup:

Usage

Usage is super easy, especially with a general knowledge of Chef. I’m not going to dive into setting up Chef, they’ve got some great documentation for that.

You’ll need to pull down the php, apache2, mysql, openssl, and git community cookbooks from Opscode and upload to your organization as well.

Then, you can just download the sugarcrm cookbook and upload to your organization:
knife cookbook site vendor sugarcrm knife cookbook upload sugarcrm

Then, add the sugarcrm recipe to whatever node or role you desire. For me, I created a role for sugarcrm:
$ knife role show sugarcrmchef_type: role default_attributes: description: env_run_lists: json_class: Chef::Role name: sugarcrm override_attributes: run_list: recipe[sugarcrm]

You can either bootstrap a new VM / cloud instance or apply the role to an existing machine and do a run of chef-client.

For my example, I created a new EC2 instance based on Ubuntu (can be any OS that the Opscode community cookbooks support):
knife ec2 server create -r 'role[sugarcrm]' --image ami-7000f019 -d ubuntu10.04-apt -S mykey -x ubuntu -i ~/.ssh/mykey.pem

Then, you can navigate to your server’s FQDN/sugarcrm in your browser to complete the install. Not to worry, the cookbook configures a config_si.php (si = silent installer), so no need to know any details about your install.

Once complete, you’ll reach the login page. Default login is admin/admin (which can be overridden with override attributes in the role/node).

That’s it!

No Software Repositories in SuSE Enterprise on EC2

Wyatt Walter — Fri, 25 Mar 2011 19:03:24 +0000

For anyone who knows SuSE Enterprise, you can file this one under “what a n00b!” (my SuSE experience in the past has been with openSUSE), but I recently inherited a project that required RHEL or SuSE Enterprise so they chose to deploy SuSE Enterprise on EC2 to reduce acquisition time. (Who would’ve thought a cloud provider like Amazon would be faster to acquire an install of one of these softwares that used more traditional licensing models?) Anyway, I needed to install a few extra pieces of software, but when I ran yast, its list of repositories was empty!? Turns out the fix is really easy, but I couldn’t easily find the answer within a minute or two, so I thought I’d share:

suse_register -a email="myemail@whatan00b.com"

Yup, that was it. No license key required (at least on the EC2 build). Novell just wanted my email address.

Zimbra Upgrade to 7.0

Wyatt Walter — Thu, 10 Feb 2011 08:15:48 +0000

Upgraded my Zimbra system from 6.0.9 (haven’t kept up-to-date with the 6.0.x series) to 7.0 tonight. The upgrade was pretty straightforward (though a couple of weird things happened). Just have to install sqlite3 as an added prerequisite on my platform (Ubuntu 10.04 x64):
apt-get install sqlite3

At the end of the upgrade, it the upgrader complained a bit about finding my license file. I have a valid license, and I just hit enter to go past the message and it wasn’t an issue after that…
Looking for valid license to install...failed to install license. *******ERROR Failed to install a license - this will prevent your server from functioning properly Please contact Zimbra to obtain a license Press RETURN to continue Activating license...license activated.

One more note. Once again, I lost my MTA and zimbraMailMode settings.

I haven’t had time yet to play with the new fanciness, but the geek inside me didn’t allow me to let a major upgrade sit for too long. So far I’m at least digging the new UI.

Monitor APC Stats with Zenoss

Wyatt Walter — Sat, 29 Jan 2011 00:23:24 +0000

I’ve (finally) published my first public project to the Internets! It’s a set of scripts to grab stats from the APC PHP opcode cacher for graphing inside Zenoss (though should be compatible with Nagios). It’s incredibly simple, but I have yet to find anyone else who has done this for Zenoss so I thought I would share in case it’s helpful. For now, it just grabs the hit ratio of the cache.

In the famous last words of many an open source project, “In the future, I plan on adding”:

fragmentation graphs
a ZenPack for easy installation
Ideas?

Grab the scripts at Github and rough install instructions are listed on the README page.

Here’s a fairly boring screenshot of the graph in action:

Using API Tools on Amazon AMIs

Wyatt Walter — Tue, 14 Dec 2010 07:39:43 +0000

I did a fairly deep dive into some new cool things in EC2 this weekend and ran into something that caught me off guard. The default Amazon AMIs come with the EC2 tools pre-loaded and ready to go. Or so I read. But, when trying to run, I was greeted with a nice stack trace:

Unexpected error: javax.net.ssl.SSLException: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty at sun.security.ssl.Alerts.getSSLException(Alerts.java:208) at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1665) at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1628) at sun.security.ssl.SSLSocketImpl.handleException(SSLSocketImpl.java:1611) at sun.security.ssl.SSLSocketImpl.handleException(SSLSocketImpl.java:1537) at sun.security.ssl.AppOutputStream.write(AppOutputStream.java:83) (snipped)

Turns out it doesn’t quite have everything it needs. Even though it’s complaining about trustAnchors and such, all it really needs is a Java Runtime Environment..

yum install java-1.6.0-openjdk

.local CNAME Queries Failing on OS X 10.6.5

Wyatt Walter — Wed, 08 Dec 2010 04:56:47 +0000

I was helping my sister with an issue with connecting to her school’s email server from her MacBook last night and discovered something interesting. Her school uses a webmail.domain.com address for the front end for OWA which is just a CNAME to its real address – a .local address. This all worked fine until a few weeks or so ago – we later pieced together that that’s when she upgraded to 10.6.5.

It seems that in 10.6.5, OS X can’t follow that CNAME for some reason. I could ping the .local address just fine and the browser connected just fine, but when I tried to use the .com CNAME’d hostname, it would fail. The kicker? The dig utility seems to ignore all of this madness which made it lie to me, and that did not help at all while troubleshooting.

I was able to find an Apple forum thread about this with someone saying that rolling back the mDNS binaries to those shipped with 10.6.4 seemed to fix it, but it didn’t help in my case (and some others in the thread). I personally don’t use anything at work or at home using the .local domain, but I hope this gets fixed soon as it breaks a lot of Microsoft-centric networks as a lot tend to use .local for one reason or another..