Fix for Older SSH Keys Not Working on Windows Git

If your old SSH keys are not working on Windows after installing the latest Git client and tools, and you're being prompted to login (~/.ssh/config configuration being ignored), the fix is to add the following line to the bottom of the C:\Program Files\Git\etc\ssh\ssh_config file:

Host *
	PubkeyAcceptedKeyTypes +ssh-rsa

That's it.  It will work again. 

Similar fix for Linux: https://blog.eamster.tk/fix-for-ssh-keys-not-working-on-newer-versions-of-debian-ubuntu/

Drive cloning — Larger to smaller hard drive (or SSD) using Clonezilla

Requirements:

Ability to use Clonezilla

Ability to use Gparted

Ability to do simple arithmetic (remember arithmetic?)

Procedure:

Using Clonezilla, I’ve always heard you can only clone a hard drive to a drive that is the same size or bigger. Not so. I just cloned a 250 GB to a 240 GB, and I suspect this method will work for any size drive difference. The only requirement is that the sum of the size of the partitions on the source drive must not be larger than the total size of the target drive. To make this the case, it will probably be necessary to resize the partitions on the source drive using Gparted. Of course, be aware that Gparted can only reduce the size of any partition to no smaller than the amount of data that it holds (known as “used space”).

In my case, the source drive is 250 GB with four partitions – one for Windows XP, one for Windows 7, one for Linux, and one for Linux swap. This is a triple boot PC using Grub2 as the initial boot manager for Linux, and Windows 7 as the secondary boot manager for both XP and 7. So this was a rather unusual boot scenario that I needed Clonezilla to clone correctly.

The target drive was a 240 GB SSD, which should be blank (unpartitioned). If it is not blank, that’s fine, as everything (data and partitions) will be erased by the cloning process automatically by Clonezilla. It will warn you about this several times. So if the target drive has anything on it you want to save, save it before starting the cloning process.

The target drive is 10 GB smaller than the source drive, so the first thing I needed to do was reduce the size of one or more partitions on the source drive by a total of 10+ GB using Gparted. I had over 30 GB of free space on the Windows 7 partition, so I reduced its partition size by 10 GB. I also deleted the 4 GB Linux swap partition after I reconfigured Linux to use a swap file instead of a swap partition, which meant I reduced the size of my partitions by 14 GB overall. Finally, also using Gparted on the source drive, I then moved all the unallocated space to the end of the drive. In my case, to move the unallocated space to the end, I simply moved the Linux partition “to the left” to immediately follow the Windows 7 partition. This is important, as you want your partitions to be contiguous from the beginning of the source drive so that they will all fit on the smaller target drive. The unallocated space, which is now all at the end of the source drive, will be ignored by Clonezilla, as if it isn’t even there. In that way, the source drive appears to be smaller than the target drive to Clonezilla.

Once the source drive is configured like this, it is time to have both source and target drives attached to the computer and boot into Clonezilla from CD (or USB). We are going to do a drive-to-drive copy, using expert mode.

We choose expert mode so we can select the -icds option when prompted, in addition to keeping all the pre-set default options.

Finally, when prompted on how to handle cloning the partition table, choose “Use the partition table from the source drive.”

Pay attention to the warnings Clonezilla gives you about erasing the target drive, verifying that the drive it will be erasing is indeed your target drive and not the source drive. Then let Clonezilla do the cloning, and if there are no errors reported due to bad sectors or other unforeseen problems, you should end up with a bootable clone of your once-larger source drive on the smaller target drive. It worked for me.

Image source

Fix for SSH Keys Not Working on Newer Versions of Debian / Ubuntu

If your old SSH keys are not working on newer versions of Ubuntu / Debian, and you're being prompted to login (~/.ssh/config configuration being ignored), the fix is to add the following line to the bottom of the /etc/ssh/ssh_config file:

    PubkeyAcceptedKeyTypes +ssh-rsa

That's it.  It will work again.  You may need to restart the ssh service

sudo service ssh restart

https://askubuntu.com/questions/1404049/ssh-without-password-does-not-work-after-upgrading-from-18-04-to-22-04

Getting Areca Backup to Work on Modern Systems

Unfortunately, Areca Backup hasn't been updated since 2015.  But, it still works great, and it's an awesome program that can compress and encrypt files into a backup archive that can be transferred to a NAS drive or uploaded to the cloud.  However, getting it to work on a modern system can be a chore.  After installing Areca Backup, when you try to launch the application, if nothing happens, you will need to perform both of the following fixes:

Install 32-bit Java first [Windows Offline], and then install 64-bit Java second [Windows Offline (64-bit)] if you have a 64-bit operating system.  Without the 64-bit version of Java, Areca will not launch on a 64-bit system.

The next step to getting Areca to run is to replace the "swt.jar" file in the lib folder found in the installation directory (default is C:\Program Files (x86)\Areca\) with this one:  http://dinofly.com/files/swt.zip

Once the original swt.jar file has been replaced in C:\Program Files (x86)\Areca\lib with the one linked above, Areca will now open and run properly.

Tested on Windows 7 x64, Windows 10 x64, and Windows 11 x64.

HTML Buttons with Div Areas Underneath Absolute Positioned

I received a design from our UI team at work that included some buttons that toggle additional HTML areas underneath them when clicked.  I've never tried doing this before or thought about this design approach, but I suppose it could be useful in certain scenarios.  As such, I decided to create a jQuery prototype here:

https://jsfiddle.net/2btkwan3/2/

The jQuery and JavaScript:

// find elements
var button = $("button.view")
// handle click and add class
button.on("click", function(e){
  $(button).not($(this)).removeClass('active');
  $(this).removeClass('active').addClass('active');
  var moreDivArea = $("div.moreStuff", $(this).closest('.buttonWrapper'));
  $("div.moreStuff").not(moreDivArea).removeClass('hide').addClass('hide');
  if(moreDivArea.hasClass('hide')){
      moreDivArea.removeClass('hide');
  }else{
    moreDivArea.removeClass('hide').addClass('hide');
  }
})

The HTML Code:

<div class="buttonWrapper">
  <button class="view">View more stuff</button>
  <div class="hide absolute moreStuff">
    <p>
    Showing this is possible!
    </p>
    <table>
      <thead>
        <tr>
          <th>Color</th>
          <th>Name</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>Blue</td>
          <td>Eric</td>
        </tr>
        <tr>
          <td>Green</td>
          <td>Matt</td>
        </tr>
        
        <tr>
          <td>Purple</td>
          <td>Glenn</td>
        </tr>
      </tbody>
    </table>
  </div>
</div>
<div class="buttonWrapper rightButtonWrapper">
  <button class="view">View Firefox coolness</button>
  <div class="hide absolute moreStuff">
    <p>
    Showing this is possible!
    </p>
    <img src="https://design.firefox.com/product-identity/firefox/firefox/firefox-logo.png" height="100">
  </div>
</div><div>
<p>
Stuff underneath this...
</p>
<img src="https://neilpatel.com/wp-content/uploads/2021/02/ExamplesofSuccessfulBannerAdvertising-700x420.jpg">
</div>

The CSS:

.hide {display: none;}
.absolute {position: absolute;}
div.buttonWrapper {display: inline-block; vertical-align: top;}
div.rightButtonWrapper {
 
}
button.view {box-sizing: border-box;}
.moreStuff {
  width: 300px;
  border: 2px solid blue;
  box-sizing: border-box;
  z-index: 999;
  background-color: white;
  padding-left: 1em;
  padding-right: 1em;
  padding-top: 0px;
  padding-bottom: 1em;
}
button.active{
  border: 2px solid blue;
}

That's all.  How this translates into a React component is another problem I guess I'll have to solve later.  For now, this was just a proof of concept using my beloved jQuery!

Manage Dell C1100 CS24-TY Servers Using IPMI Tool

Dell C1100 servers can be managed using the IPMI tool which interfaces with the low level BMC interface.  Dell has also released a bmc specific utility that compliments the generic ipmitool to better configure and manage specific settings that are difficult to configure using ipmitool on its own.

Here's how to use both ipmitool and the bmc utilities.  First, login as root:

sudo -i

Now, install the ipmitool:

yum install OpenIPMI ipmitool -y

Start the ipmi service:

service ipmi start

Download the bmc utility:

mkdir -p ~/Downloads/bmc
cd ~/Downloads/bmc
wget -N "http://dinofly.com/files/dell_c1100/bmc-2014-10-15.zip"

If your system is running versions of PERL 5.26 or newer, download this version instead:

# For PERL 5.26+
wget -O "bmc-2014-10-15.zip" -N "http://dinofly.com/files/dell_c1100/bmc-2014-10-15_perl_5.26.zip"

Unzip the bmc tool and make it executable:

unzip bmc-2014-10-15.zip
chmod +x bmc

Here's how to change the BMC interface IP settings:

ipmitool lan set 1 ipsrc static
ipmitool lan set 1 ipaddr x.x.x.x
ipmitool lan set 1 netmask x.x.x.x
ipmitool lan set 1 defgw ipaddr x.x.x.x
./bmc nic_mode set [dedicated|shared]
./bmc allinfo

If the BMC web interace is not responding, try this:

ipmitool bmc reset cold

Running and Debugging Specific WordPress Cron Hooks Manually Using WP-CLI

If your WordPress instance is configured with debugging turned off (WP_DEBUG set to false in wp-config.php) and you need to troubleshoot, debug, or run a specific WordPress cron hook or function manually, you'll find that it's pretty tough to do so.  Fortunately, I found a relatively easy way to do exactly this using WP-CLI.

Install WP-CLI

Install WP-CLI by using the below commands as root:

sudo -i
curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
chmod +x wp-cli.phar
sudo mv wp-cli.phar /usr/local/bin/wp

Now, change into your WordPress instance vhosts directory:

cd /var/www/vhosts/{YOUR_DOMAIN}/httpdocs

Update the above path as necessary.

To run all the scheduled WordPress cron events, use this command:

wp cron event run --all --allow-root

To run a specific WordPress cron hook, use this command:

wp cron event run "NAME_OF_CRON_HOOK" --allow-root

If you need help determining the name of the cron job hook you specifically want to run or debug, install the WP Control plugin in your WordPress instance. Then visit the /wp-admin/tools.php?page=crontrol_admin_manage_page page to see a list of cron hooks and when they run.  Grab the name from the "Hook" column and update your wp cli command to run that cron event!

You can add echo statements and other code to your individual cron function plugins to better debug and troubleshoot them.

OpenVPN Expired CRL – VPN Won't Connect

Recently, I ran into an issue where OpenVPN was no longer working for existing clients.  After looking at the OpenVPN log in /var/log/openvpn.log, I found the following:

VERIFY ERROR: depth=0, error=CRL has expired:

If you see an OpenVPN error about an expired certificate revocation list (CRL), here's how to generate a new CRL:

cd /etc/openvpn/easy-rsa
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
chown nobody:nogroup /etc/openvpn/crl.pem
service openvpn restart

Problem solved!

Support Older TLS Versions in Newer Ubuntu / Debian OS Versions

Edit openssl.conf file:

sudo nano /etc/ssl/openssl.cnf

Add this line at the top:

openssl_conf = openssl_init

And add these lines at the end:

[openssl_init]
ssl_conf = ssl_sect

[ssl_sect]
system_default = system_default_sect

[system_default_sect]
CipherString = DEFAULT@SECLEVEL=1

https://askubuntu.com/questions/1233186/ubuntu-20-04-how-to-set-lower-ssl-security-level#answer-1296578

cURL and wget Issues on Ubuntu 16.04

When using wget or curl to make HTTP requests from a no longer supported installation of Ubuntu 16.04 Xenial, if you get any of the following errors:

curl gnutls_handshake() failed: Error in protocol version
curl: (35) error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version  /home/mohan/mesg
[SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:727) 

The solution is to add SavOS Rob Savoury PPAs to get updated curl and wget packages:

sudo add-apt-repository ppa:savoury1/build-tools
sudo add-apt-repository ppa:savoury1/backports
sudo add-apt-repository ppa:savoury1/python
sudo add-apt-repository ppa:savoury1/encryption
sudo add-apt-repository ppa:savoury1/curl34
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install wget curl python2.7