To find a VM with a particular snapshot name

Get-Snapshot -VM VM -Name '<snapshot name>'

Power on/off VM via command line.

Power on a VM

To power on a virtual machine from the command line:

1. List the inventory ID of the virtual machine with the command:
   
   vim-cmd vmsvc/getallvms |grep <vm name>
   
   Note: The first column of the output shows the vmid.
   
   
2. Check the power state of the virtual machine with the command:
   
   vim-cmd vmsvc/power.getstate <vmid>
   
   
3. Power-on the virtual machine with the command:
   
   vim-cmd vmsvc/power.on <vmid>

Get all vm's with connected CD rom drives

This is a powercli command to get all the vm's with connected cdrom drive.  

get-cluster | where {$_.Name -eq "SFColo Test & Dev"} | get-vm | where { $_ | get-cddrive | where { $_.ConnectionState.Connected -eq "true" } } | select Name

Get VMX and VMWare tools version and export to CSV

To get the VMware tools versions and export it to a csv called vmtools.csv

get-vm | where {$_.powerstate -ne "PoweredOff" } | where {$_.Guest.ToolsVersionStatus -ne "guestToolsCurrent"} | % { get-view $_.id } | select Name, @{ Name="ToolsVersion"; Expression={$_.config.tools.toolsVersion}}, @{ Name="ToolStatus"; Expression={$_.Guest.ToolsVersionStatus}} | Export-Csv -NoTypeInformation -UseCulture -Path d:\vmtools.csv

Check if a user is in an AD group.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.DirectoryServices;

using System.DirectoryServices.AccountManagement;

using System.Security.Principal;

namespace test_adgroup

{

   class Program

    {

       static void Main(string[] args)

        {

           string username = "cykill";

           //string username = WindowsIdentity.GetCurrent().Name;

           PrincipalContext pc = new PrincipalContext(ContextType.Domain,"mydomainname");

           UserPrincipal up = UserPrincipal.FindByIdentity(pc, username);

           if(up.IsMemberOf(pc,IdentityType.SamAccountName,"mygroup"))

            {

               Console.WriteLine("In Group");

            }

           else

            {

               Console.WriteLine("Not In Group");

            }

        }

    }

}

Caveat:  This does not work for the "Domain Users" group.  It always return false.  I don't know why.

Update:  Seems it doesn't work for large AD groups.

Disable IPv6 via commands in Windows

get-netadapterbinding

set-NetAdapterBinding -Name “Network Adapter Name” –ComponentID ms_tcpip6 –Enabled $False

new-itemproperty -Path HKLM:\SYSTEM\CurrentControlSet\services\TCPIP6\Parameters -Name DisabledComponents -PropertyType DWord -Value ffffffff

Reset a slot in Cisco UCS.

- Reset a slot (equivalent to remove power from the blade and reapplying):

     #reset slot x/y (where x = chassis and y = blade or server #)

Tarball an entire Linux system

#!/bin/bash

#Version: 1.0

#Description:  Checks for a destination mount directory.  Mounts it if it does not exist, the backs up the server to the mount directory.

mountdir="<mount directory>"

servername="<servername>"

exclusions="--exclude=/mnt --exclude=/proc --exclude=/lost+found --exclude=/tmp --exclude=/media --exclude=/sys --exclude=/dev --exclude=/run --exclude=/var/cache"

if [ -d $mountdir ]; then

     cd $mountdir

     tar -zcpf $servername-full-backup-`date '+%d-%B-%Y'`.tar.gz / $exclusions

else

     sudo mount -t cifs -o username=moatisuser,password=moatisuser,rw \\\\fw24\\ata_1 /mnt/fw24

     cd $mountdir

     tar -zcpf $servername-full-backup-`date '+%d-%B-%Y'`.tar.gz / $exclusions

fi

Setup iptables in Linux

Ubuntu does come with iptables preset like in Fedora. Here's the base set up for iptables.

Add iptable rules.

Block Null Packets

iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP

Reject Syn-Flood Attack

iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP

Reject XMAS/recon packets

iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP

Allow custom ports

<here>

Accept Established Connections

iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

iptables -A INPUT -j REJECT iptables -A FORWARD -j REJECT

iptables -A FORWARD -i eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT

iptables -A FORWARD -j REJECT

iptables -A OUTPUT -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT

Use iptables-save to save it to a file.

iptables-save > /etc/iptables.rules

Edit rc.local to import iptables rules during boot up.

iptables-restore < /etc/iptables.rules

Write to a file in CSharp

Quick and dirty way to write to a file in C#.

StreamWriter log = new StreamWriter(@c:\log.txt);

log.WriteLine(ErrorMessage);

log.WriteLine();

log.Close();

test test