This is a selection of videos about Entity Framework.
Entity Framework 5.0 – Intro to Model First – Part 1 of 2
Entity Framework 5.0 – Intro to Model First – Part 2 of 2
Entity Framework 5 – Database First
I wanted to connect to an OpenVPN server from my Ubuntu on a stick.
There are different clients but the one I liked was the Linux Network-Manager GUI for OpenVPN. To install it you need to enable the Universe repository first:
sudo add-apt-repository universe sudo apt-get update
and then type:
sudo apt-get install network-manager-openvpn
After the installation completes add a VPN connection by clicking on the wireless icon from the top menu and selecting VPN Connections -> Configure VPN. The network connections dialog pops up:
Click the Add button and from the drop-down either select OpenVPN or Import a saved VPN connection… and then click Create button:
In the first case you have to manually configure everything like the location of the user certificate, the private key, etc.
The second option allows you to import an existing configuration file that already have all these settings defined. What I did was to put the configuration file with all the files referenced by it in one folder and import the configuration file.
You can also configure the existing network connections (both wired and Wi-Fi) to automatically connect to your VPN. This is done in the General tab.
After I installed Ubuntu 14.04.1 LTS I found that the Bluetooth drivers and utilities were already installed. I paired my Bluetooth headset Jabra BT620s without any problems. Unfortunately I could not make it to be the default device for playback or this was what I was trying to do similarly to the way you would do it in Windows. No matter what I was doing the sound kept coming from the computer’s speakers.
It took reading a lot of posts talking about other peoples problems with Bluetooth headsets and their solutions. I tried several of them and what worked for me was installing PulseAudio Volume Control from Software Center:
It allows you to specify the profile for your headset which by default is off. I set it to High Fidelity Playback (A2DP):
The last step is in sound settings to set the mode for the headset to match the profile you chose in the PulseAudio Volume Control:
That was all – no messing with configuration files or running commands in a terminal. I hope these steps work for you too.
This is the first in a series of blog posts that talk about running Ubuntu from a USB flash drive.
Ubuntu (/u:’bu:ntu:/ oo-BOON-too) is a Debian-based Linux operating system. For more information about the operating system itself, please check Ubuntu (operating system) on Wikipedia.
Now that you know what Ubuntu is you may still wonder why anyone would like to run it from a USB flash drive. How about having a free full feature GUI operating system that comes with tons of free tools and applications that you can carry with you and run on any computer that has a USB port without the need to install anything? And it will even run on this 10-year old computer in your basement and will recognize all your devices and will install all the necessary drivers automatically. Not convinced yet? Well, I respect your right to do whatever you want with your time – go check what your friends are doing on Facebook or waste couple of hours on Minecraft. If on the other hand you are curious or stubborn enough to keep reading I will show you how to install Ubuntu on USB flash drive in few easy steps.
I will be doing this from Windows. I have 8GB USB flash drive and part of it will be used to host Ubuntu and the rest will be used for sharing files. In order to achieve this I need to partition the USB drive first. In Windows I use EaseUS Partition Master. Download it from here.
Install and run EaseUS Partition Master with the USB plugged in. We are going to create 3 partitions.
Partition 1 Type: Logical File System: FAT32 Size: 2GB Label: STORAGE
Partition 2 Type: Primary File System: FAT32 Size: 1GB Label: UBUNTULIVE
Partition 3 Type: Primary File System: EXT2 Size: 4.22GB (The rest of the space) Label: casper-rw
Press the “Apply” button to re-partition the USB drive. You should see something similar:
The first partition will be used for file sharing. It is FAT32 because this is the file system that most of the operating systems can read. You can use it under Windows and Linux. If you need more space you can make it bigger at the expense of the last partition (casper-rw).
The second partition is where we are going to install UBUNTU. 1GB is a perfect size. It has to be FAT32 and Primary. Make sure it is set to Active. Since Windows will only show one partition for a removable USB flash drive we need this partition setup as described in order to be accessible in Windows.
The third partition will be used to store any changes we make to Ubuntu – installing new applications, changing the desktop image, etc. EXT2 is a good choice for a file system when it comes to USB flash drive. EXT3 and EXT4 are newer and have some advantages but also come with excessive disk operations which is not desirable for a USB flash.
Now you need to download the Ubuntu ISO file. We want the desktop version. I am using the 64-bit but you should make sure your computer is 64-bit. Otherwise get the 32-bit version. At the time of writing this the latest available version is Ubuntu 14.04.1 LTS.
The next step is to install UBUNTU on the USB. There are several tools to do that and I had different results in the past. One that work well for me is Universal USB Installer. Download it.
Run the installer and on the selections page select Ubuntu from the drop-down, browse to the location you saved the ISO file and select the USB Flash Drive from the drop-down. Also use the slider to specify the Persistent file size. Do not slide it all the way to the right because it will complain there is no enough space. Just put the slider in the middle – the size of the file is not important since we are not going to use it at all. We are doing it just to make the installer to update some configuration files that tell the system to persist the changes. We will be using the third partition we created to persist all the changes we are making to our system:
Leave the installer to run and be patient. When it is ready you should see a message like this:
Click the “Close” button to finish. Go to the USB in file explorer and delete a file called casper-rw. This is the file that would keep all the changes normally. Since we have a dedicated partition we do not need it and have to delete it.
The last step will be to hide the UBUNTU partition and instead make the STORAGE partition the active one. Run the EaseUS Partition Master and make the STORAGE partition Primary and set it to Active:
As a result you will see a new drive labeled STORAGE in windows explorer which you can use to for storing files – music, pictures, etc.
Now it is time to boot from the USB. Depending on the computer you have you might have to change the boot order in your BIOS or if it supports a boot menu you can select the USB drive directly from there. Once the GUI loads try to change the desktop background and reboot again. You should see the new background you selected which confirms that the changes we make to the system are persisted between restarting the computer.
This is it! Hopefully it works for you. If you have any problems, please go back and make sure you followed all the steps. If you still have questions, please do not hesitate to ask.
Keep in mind that in general Ubuntu will run much slower from a USB flash drive than from a regular hard-drive. What the USB gives us is a system we can take with us and run on another computer. If you have a dedicated computer on which you would like to run Ubuntu it is much better to install it on your hard-drive. A good information on how to run Ubuntu alongside Windows can be found here:
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This is a very thorough article on ways to speed up a SQL database by Matt Perdeck
You can back up VMware VM for free using ghettoVCB.sh script. Everything you need is here:
https://github.com/lamw/ghettoVCB
I was unable to download it directly to the the VMware server because wget v1.19 refused to download form https:// url.
Instead I downloaded the file to my Windows machine and used WinSCPPortable to upload the file to the server.
To extract the files do:
unzip ghettoVCB-master.zip
Go to ghettoVCB-master folder and make the scripts executable:
chmod +x ghettoVCB.sh
chmod +x ghettoVCB-restore.sh
Add a new NFS share as a datastore “backup”. This is where we are going to store the backup files.
Create some folders and configuration files. A typical way to execute the script is:
./ghettoVCB.sh -f vms_to_backup -g global_config/vm_global.conf
To schedule a cron job add the following line to /var/spool/cron/crontabs/root
0 0 * * 1-5 /scratch/ghettoVCB-master/ghettoVCB.sh -f /scratch/ghettoVCB-master/vms_to_backup -g /scratch/ghettoVCB-master/global_config/vm_global.conf > /vmfs/volumes/backup/ghettoVCB-backup-$(date +\%s).log
Then add the following to /etc/rc.local.d/local.sh
/bin/kill $(cat /var/run/crond.pid)
/bin/echo “0 0 * * 1-5 /scratch/ghettoVCB-master/ghettoVCB.sh -f /scratch/ghettoVCB-master/vms_to_backup -g /scratch/ghettoVCB-master/global_config/vm_global.conf > /vmfs/volumes/backup/ghettoVCB-backup-\$(date +\\%s).log” >> /var/spool/cron/crontabs/root
crond
In order to allow the script to send emails you need to:
Step 1 – Create a file called /etc/vmware/firewall/email.xml with contains the following:
outbound tcp dst 25 true false
Step 2 – Reload the ESXi firewall by running the following ESXCLI command:
~ # esxcli network firewall refresh
Step 3 – Confirm that your email rule has been loaded by running the following ESXCLI command:
~ # esxcli network firewall ruleset list | grep email email true
Step 4 – Connect to your email server by using nc (netcat) by running the following command and specifying the IP Address/Port of your email server:
~ # nc 172.30.0.107 25 220 mail.primp-industries.com ESMTP Postfix
To perform a dry run restore do:
./ghettoVCB-restore.sh -c vms_to_restore -d 1
To perform a real restore do:
./ghettoVCB-restore.sh -c vms_to_restore
A series of videos about growing strawberries: