Category Archives: Software Development

Combining a key and certificate into a .pfx file

Posted on by
Reply

If you want to use SSL with your site in Azure you need to have a .pfx file.

We Apache you most likely have a certificate and a private key. I am using certificate from Letsencrypt.

Using openssl you can generate the .pfx file like this:

openssl pkcs12 -export -out /tmp/certificate.pfx
-inkey /etc/letsencrypt/live/yourdomain.tld/privkey.pem
-in /etc/letsencrypt/live/yourdomain.tld/cert.pem
-certfile /etc/letsencrypt/live/yourdomain.tld/chain.pem

Replace yourdomain.tld with your actual domain name.
You will be asked for a password to protect the .pfx file

How to install .Net Core on Ubuntu 16.04

Posted on by
Reply

Add the dotnet apt-get feed

In order to install .NET Core on Ubuntu, you need to first set up the apt-get feed that hosts the package you need.

sudo sh -c 'echo "deb [arch=amd64] https://apt-mo.trafficmanager.net/repos/dotnet-release/ xenial main" > /etc/apt/sources.list.d/dotnetdev.list'
sudo apt-key adv --keyserver apt-mo.trafficmanager.net --recv-keys 417A0893
sudo apt-get update

Install .NET Core SDK

Before you start, please remove any previous versions of .NET Core from your system by using this script.

sudo apt-get install dotnet-dev-1.0.0-preview2-003121

Initialize some code

Let’s initialize a sample Hello World application!

mkdir hwapp
cd hwapp
dotnet new

Run the app

The first command will restore the packages specified in the project.json file, and the second command will run the actual sample:

dotnet restore
dotnet run

And you’re ready!

You now have .NET core running on your machine!

Source: .Net Core on Ubuntu

backup of VMWare using ghettoVCB.sh

Posted on by
Reply

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:


  
    email
    
      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

HTTP Error 503. The service is unavailable

Posted on by
Reply

I recently had a problem with IIS on Windows 7 where trying to access http://localhost on the default port 80 was giving me an error:

“HTTP Error 503. The service is unavailable”

I spent several hours trying to find the cause and trying different things without any success.
Finally I came across this post that helped me resolve the problem.

The root cause was an URL Reservation http://+:80/

To remove the reservation type the following in a command prompt (but first read the post to know what your are doing):


netsh http delete urlacl http://+:80/