Linux on Shane Cunningham

My all in one OpenStack deployment at home

Sun, 19 Jan 2014 22:33:09 +0000

I use XenServer 6.2 as my hypervisor at home to run anywhere from 5-10 VMs. But I wanted to change up this setup and move to OpenStack Private Cloud deployment. Yes, it’s overkill for my use but oh well.

I’ve messed around a few times with using OpenStack as replacement for my XenServer 6.2 setup, but always ran into an issue, usually getting the networking correct given my home network. Luckily with the OpenStack Havana release networking has become much simpler to get my head around and deploy. Also, a number of OpenStack installer scripts and how to guides have improved since the early OpenStack releases. For my deployment I used Red Hat’s RDO and packstack to deploy OpenStack Havana. From Red Hat, “RDO is a community of people using and deploying OpenStack on Red Hat Enterprise Linux, Fedora and distributions derived from these (such as CentOS, Scientific Linux and others).”.

MySQL - Reset root password and extract table from dump

Sat, 23 Mar 2013 02:06:15 +0000

Just a couple MySQL notes.

Debian 6 Squeeze - Reset MySQL root user password

You’ll need to stop MySQL server for resetting it this way.

service mysqld stop

Start MySQL with --skip-grant-tables and send to background. Press enter to get back to command line.

mysqld_safe --skip-grant-tables &

Connect to to MySQL.

mysql -u root

Use mysql database and run the command to update the root user password and flush privileges.

Install MySQL 5.6 on CentOS 6.3

Thu, 14 Feb 2013 07:36:21 +0000

No guarantee this works or that it won’t completely blow up your system.

wget http://dev.mysql.com/get/Downloads/MySQL-5.6/MySQL-server-5.6.10-1.el6.x86_64.rpm/from/http://cdn.mysql.com/
wget http://dev.mysql.com/get/Downloads/MySQL-5.6/MySQL-client-5.6.10-1.el6.x86_64.rpm/from/http://cdn.mysql.com/

libaio is required so install that bad boy.

yum install libaio

To make this work you need to remove mysql-libs-5.1.61-4.el6.x86_64 which also removes a few other things, please make sure you are ok with these things being removed. The programs removed are cronie, cronie-anacron, crontabs and postfix.

yum remove mysql-libs-5.1.61-4.el6.x86_64

Install MySQL 5.6.

VM not sending hostname to DNS/DHCP server

Wed, 13 Feb 2013 07:23:18 +0000

On some VMs I spin up on ESXi the hostname is not sent to my DNS/DHCP server running in pfSense. Haven’t found exactly why because it seems occasionally Ubuntu VMs do send this correctly on first boot. I’m probably doing something not smart. Anyway, you can easily fix this problem by adding the following -

CentOS/Ubuntu
Add this to /etc/sysconfig/network

text

DHCP_HOSTNAME=hostname

Replace hostname with your servers hostname and restart networking. It should now send the hostname to your DNS/DHCP server.

Fedora 17 on a 2011 13" MacBook Air

Sat, 15 Dec 2012 07:29:30 +0000

Decided to throw Fedora 17 on my MacBook Air to see how well it works. Actually, works pretty damn well. Wireless, backlight keyboard and trackpad all work with no modifications. I still have a lot to configure, but this seems like a very nice start to something I thought would have a lot more problems.

Installed rEFIt on my Air. Made a USB bootable drive of Fedora 17 ISO 64-bit. Rebooted and held down Option key, selected Fedora media. Installed Fedora using the entire disk, I did not want to dual boot, wanted only Fedora. After install Fedora reboots the system, my system hung, but I took out the USB stick, powered off and powered back on holding the Option key. Fedora was my only bootable device so I selected that and it booted straight into Fedora 17.

uuencode and mail

Sat, 08 Sep 2012 16:53:05 +0000

Needed to e-mail an attachement using only mail, after a little Googling I found the following which works great! The first .gz is the file location, the second .gz is what will show up in the body of the email allowing you to download it.

uuencode accesslogs.gz accesslogs.gz | mail -vs "Access Logs" youremail@blah.com

Get IP count from access log

Wed, 15 Aug 2012 00:11:01 +0000

This will list the IP and number of times that it appears in your access log if more than once.

awk '{!a[$1]++}END{for(i in a) if ( a[i] >1 ) print a[i],i }' /var/pathtoyour/access.log | sort -n

If you only want it to show the IP if it appears, for example, more than 10 times change a[i] >1 to a[i] >10.

CIFS VFS: cifs_mount failed w/return code = -22

Sun, 17 Jun 2012 21:40:25 +0000

I am constantly forgetting one or more Samba/CIFS packages that are required to mount a Windows network share. The return codes don’t really provide very much useful info. Even when searching Google there was not a whole lot for return code -22. For CentOS, I found installing the following package solved my CIFS error.

yum install cifs-utils

Two Linux notes

Thu, 29 Mar 2012 03:17:26 +0000

SSH Tunnel for web traffic

ssh -D 9998 -C shane@myserver.com

Where “myserver.com” is a server you operate with SSH setup. Now you need to configure your browser to use the tunnel. In OS X you can go to Network -> Advanced -> Proxies -> Check SOCKS and input localhost:9998 or whatever port you used. Directly from Chrome you can also select Preferences -> Under The Hood -> Change Proxy Settings… -> and it will go directly to your OS X Network/Proxies tab.

Add Linux Integration Services v3.2 to CentOS 6.2 VM

Fri, 23 Mar 2012 02:55:21 +0000

Here are the steps to install Linux Integration Services v3.2 to a CentOS 6.2 VM in Hyper-V.

Add the Linux IC v3.2.iso to a CD-Rom attached to your CentOS 6.2 VM.

mount /dev/cdrom /media

Create a directory, for example, mkdir /home/LinuxServices

cp /media/* /home/LinuxServices
cd /home/LinuxServices
./install.sh

CentOS and locate

Sat, 26 Nov 2011 18:14:00 +0000

The following install and daily cron database update need to be done to get locate working.

yum install mlocate
/etc/cron.daily/mlocate.cron

Getting OS X Lion working with network share

Sat, 08 Oct 2011 08:44:00 +0000

Mac OS X Lion broke the ability for Time Machine to backup to a network share over Samba. I usually backup everything to a Windows Server 2008 R2 computer running headless in my closet, but OS X Lion will not connect any longer due to AFP 3.3 being used. I still haven’t found a way for my iMac to connect directly to the server but I have a workaround that might work for you.

Hyper-V and CentOS

Tue, 19 Jul 2011 06:51:00 +0000

CentOS is not listed as a supported OS for Microsoft’s Hyper-V but I’ve found it works pretty well. Whenever I install CentOS on Hyper-V I forget the configuration file you have to create to get eth0 working. So here it is.

Install CentOS. Add legacy NIC in Hyper-V settings.

Create file /etc/sysconfig/network-scripts/ifcfg-eth0 and input the following with your values of course.

/etc/sysconfig/network-scripts/ifcfg-eth0 ini

DEVICE=eth0
BOOTPROTO=static
BROADCAST=192.168.0.255
IPADDR=192.168.0.100
NETMASK=255.255.255.0
NETWORK=192.168.0.0
ONBOOT=yes
TYPE=Ethernet
GATEWAY=192.168.0.1

Some other commands or config files that might need to be edited.

Ubuntu apt-get-update fails with 404

Sun, 26 Jun 2011 08:46:00 +0000

I went to update my Nagios server running Ubuntu Server 8.04 and received a 404 error when I tried to update the repositories. Something along the lines of 404 Not Found [IP: xx.xx.xx.xx]. Obviously, 8.04 is EOL so I guess when that happens they also move the official repositories too. Fix it with the following.

Edit /etc/apt/sources.list

Replace all references of archive.ubuntu.com with old-releases.ubuntu.com

Use PuTTY to connect to Amazon EC2

Sun, 12 Jun 2011 10:15:00 +0000

Another I’m going to post because I’ll forget…I was messing around with Amazon EC2 and had some minor issues connecting using SSH and PuTTY. Here are the simple steps I used to connect to a CentOS EC2 instance.

Open SSH in the Security Groups section of AWS Management Console.

Download PuTTY and PuTTYgen. Open PuTTYgen and load the .pem key you downloaded from Amazon when you created the instance.

Save private key as “id_rsa-gsg-keypair.ppk”, ignore pass phrase prompt.

Linux for everyday, Windows for gaming

Sat, 16 Apr 2011 07:58:54 +0000

I have an old Acer laptop, circa 2006. It’s a decent machine, 1.7 GHz Centrino Duo, 2 GB RAM, 15” screen. It came with Windows Vista Premium that we have been using since day one (don’t shoot me). I know there are a ton of complaints about Vista, but for the basic things we use this laptop for it has done a decent job with minimum trouble. However, there were a number of things about it that made me consider a switch to Ubuntu 10.10.

Linux guides

Tue, 12 Apr 2011 06:53:26 +0000

I keep forgetting how good of a resource Linode Library is for Linux beginners. It covers pretty much all the basic system administration you will need for not only Linode servers, but pretty much any LAMP or LEMP stack. They have great explanations along with the commands to use.

Ubuntu 10.10 running in Hyper-V

Tue, 07 Dec 2010 23:54:19 +0000

Simple write up on installing Ubuntu 10.10 in Hyper-V.

Link