ESXi – How to configure and enable SNMP

Just a quick PowerShell script that sets up SNMP on ESXI hosts

 

#Script to enable and configure SNMP on ESXI host
Get-VMHost | Select Name
$host_name = Read-Host "Host name:"
$location="London HQ"
$esxcli = get-esxcli -vmhost $host_name
$esxcli.system.snmp.set($null,"public","true",$null,$null,$null,$null,$null,$null,$null,$null,$null,$location)
$esxcli.system.snmp.get()
Write-host "Now go to the host and start the service"

Once that is done you still need to go the ESXi host and enable/start the SNMP service.

Managing VMware Tools advanced options in PowerShell

Here is a quick way of selecting the VMware Tools Advanced option: “Check and upgrade Tools during power cycling” for all VMs in a cluster. Here is a screen shot of the option in question:

vmware_tools_upgrade

And here is the script:

$vms = get-cluster "Cluster Name" | get-vm

foreach($vm in $vms) 
{ 
$spec = New-Object VMware.Vim.VirtualMachineConfigSpec
$spec.changeVersion = $vm.ExtensionData.Config.ChangeVersion
$spec.tools = New-Object VMware.Vim.ToolsConfigInfo
$spec.tools.toolsUpgradePolicy = "upgradeAtPowerCycle"
 
$_this = Get-View -Id $vm.Id
$_this.ReconfigVM_Task($spec)
}

ESXI 6.0 monitoring SSD drive TBW

“Terabytes Written” is the total amount of data that can be written into an SSD before it is likely to fail.

There is a nicely written article on this blog explaining how to get the TBW for a SSD drive in ESXI host – open here.

However since I am a lazy kind of person I like to get stuff scripted and emailed to me.

In essence here is what I have done:

Install smartctl

  1. Download smartctl-6.6-4321.x86_64.vib
  2. Copy the VIB to the /tmp/ directory of an ESXi host
  3. SSH to the ESXi host
  4. Set the VIB acceptance level to CommunitySupported
    # esxcli software acceptance set --level=CommunitySupported
  5. Install the package (Maintenance Mode or Reboot is not required)
    #esxcli software vib install -v /tmp/smartctl-6.6-4321.x86_64.vib

The tool is located at /opt/smartmontools/smartctl and works just like the Linux version.
Locate physical disks with ls -l /dev/disks/

Create the script and automate
Save the below lines in a script somwehere:

#!/bin/sh
 var=`/opt/smartmontools/smartctl -d sat --all /dev/disks/t10.ATA_____Samsung_SSD_850_EVO_M.2_250GB___________S24BNXAH119741P_____ | grep Total_LBAs | cut -d"-" -f2`
 TBW=`awk "BEGIN {print $var*512/1099511627776}"`
 echo "Total TB Writen so far: " $TBW

var2=`/opt/smartmontools/smartctl -d sat --all /dev/disks/t10.ATA_____Samsung_SSD_850_EVO_M.2_250GB___________S24BNXAH119741P_____ | grep Power_On | cut -d"-" -f2`
 POWERON=`awk "BEGIN {print $var2/24}"`
 echo "Device in use since [days]: " $POWERON

echo "Device has 5 Years Limited Warranty or 75TBW Limited "
 REMAIN=`awk "BEGIN {print (75*$POWERON)/$TBW}"`
 echo "Device has approximately: " $REMAIN "days left"
 REMAINY=`awk "BEGIN {print $REMAIN/360}"`
 echo "that is approx. $REMAINY years left"

 

To see how much life my SSD drive has got left I added that script to /etc/profile.local file so whenever I login I get something like that:

Samsung SSD 850 Evo m.2 250GB Remaining Disk LifeTime
Tue May 24 16:30:12 UTC 2016

Total TB Written so far: 1.26013
Device in use since [days]: 97.9167
Device has 5 Years Limited Warranty or 75TBW Limited
Device has approximately: 5827.77 days left
that is approx. 16.1883 years left

As I don’t often login to my esxi host via ssh I created a cron job – /var/spool/cron/crontabs/root :

0    0   1,15 *  *    source /opt/smartmontools/report.sh > /opt/smartmontools/disklifetime.txt

and specified it to run every two weeks and save the results to a file. That file is then picked up (via scp) by my linux server and emailed to me.

Job done.

Intel NUC – Install USB Ethernet Adapter

The only letdown with Intel NUC is the only one Ethernet adapter. Luckily thanks to some great minds out there there is a way out of this.
All is needed is a Startech USB 3.0 to Gigabit Ethernet Adapter (Part Number: USB31000S) and the USB driver for ESXI downloadable from here: https://github.com/lamw/ax88179_178a-esxi

UPDATE (1/1/18) – Updated driver for ESXi 6.5, details here.

    • Download the driver – ESXI 6u2 driver – see above github link
    • Transfer the vib file to your ESXI host
scp vghetto-ax88179-esxi60u2.vib root@esxi:/
    • Ensure that your NUC has USB 3 adapter enabled
[root@esxi:~] lsusb
 Bus 002 Device 002: ID 0b95:1790 ASIX Electronics Corp. AX88179 Gigabit Ethernet
 Bus 001 Device 005: ID 8087:0a2b Intel Corp.
 Bus 001 Device 003: ID 0951:1665 Kingston Technology Digital DataTraveler SE9 64GB
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    • Install the vib driver:
[root@esxi:~] esxcli software vib install -v /vghetto-ax88179-esxi60u2.vib -f
 Installation Result
 Message: Operation finished successfully.
 Reboot Required: false
 VIBs Installed: virtuallyGhetto_bootbank_vghetto-ax88179-esxi60u2_6.0.0-1.0.0
 VIBs Removed:
 VIBs Skipped:
    • Verify that it was installed correctly:
[root@esxi:~] esxcli network nic list
 Name PCI Device Driver Admin Status Link Status Speed Duplex MAC Address MTU Description
 ------ ------------ ------------ ------------ ----------- ----- ------ ----------------- ---- --------------------------------------------
 vmnic0 0000:00:1f.6 e1000e Up Up 1000 Full b8:ae:ed:7d:e2:d5 1500 Intel Corporation Ethernet Connection I219-V
 vusb0 Pseudo ax88179_178a Up Up 1000 Full 00:24:9b:16:33:f8 1500 Unknown Unknown

esxi_nics

Cloned Server 2012 R2 – how to change SID

When working with linked clones I often skip the sysprep stage. In most cases that does not interfere with what I am doing but in some cases (ie joining that machine to a domain) Windows complains about duplicate SID:

2012r2sysprep1

However in 2012 Sysprep is already available under: %systemroot%\System32\sysprep\sysprep.exe.

That makes it bit quicker and easier to fix this problem:

2012r2_sysprep2

It takes few minutes to complete and after a restart we are back in action.