2vcps and a Truck » esxcfg

ESX Commands – Summary

Jon Owings — Wed, 23 Dec 2009 01:20:30 +0000

It took just about a year. Which shows I need more consistency with my blog (should have been about 1 month). I finally finished a brief explanation of each esxcfg command. My little self study for the VCDX, this is in no way exhaustive.

Make sure to check out other great resources out there:
Simon Long
Harley Stagner
Both good places to start.

Hopefully my VCDX compilation page can help.

ESX Commands: esxcfg-vswitch

ESX Commands: esxcfg-vswif

Jon Owings — Tue, 22 Dec 2009 01:17:33 +0000

The esxcfg-vswif command allows you to create and modify Service Console ports and their IP information. Many times I have to change stuff after the install process is complete and the only place is via the direct service console because network communication is not possible. This usually happens when the network team changes a vlan in the middle of the install or they change a subnet. Not to disparage network teams many times I am the network team and the virtualization team.
Create a new vswif:
#first add a port group with esxcfg-vswitch esxcfg-vswitch -A "Service Console Test" vSwitch-Test #then use esxcfg-vswif to create a new vswif esxcfg-vswif -a -i 172.16.50.40 -n 255.255.255.0 -p "Service Console Test" vswif1 #List your vswifs esxcfg-vswif - l #Example: [root@esx3 root]# esxcfg-vswif -l Name Port Group IP Address Netmask Broadcast Enabled DHCP vswif0 Service Console 172.16.50.50 255.255.255.0 172.16.50.255 true false vswif1 Service Console Test172.16.50.40 255.255.255.0 172.16.50.255 true false

Modify your Service Console network information:
esxcfg-vswif -i 172.16.50.41 -n 255.255.255.0 vswif1 #example [root@esx3 root]# esxcfg-vswif -i 172.16.50.41 -n 255.255.255.0 vswif1 Setting IP config Nothing to flush. [root@esx3 root]# esxcfg-vswif -l Name Port Group IP Address Netmask Broadcast Enabled DHCP vswif0 Service Console 172.16.50.50 255.255.255.0 172.16.50.255 true false vswif1 Service Console Test172.16.50.41 255.255.255.0 172.16.50.255 true false

ESX Commands: esxcfg-vmknic

Jon Owings — Sun, 20 Dec 2009 21:40:05 +0000

You need to have VMkernel ports to do VMotion, Software iSCSI and Fault Tolerance. These ports can be easy to create and manage from the command line. I generally can be found adding them for vSphere iSCSI. I especially use the cli for tasks that are repeated over and over. Creating multiple ports per ESX host is time consuming and tends to introduce typing errors. So it is always a good idea to get them all done in a script file to reduce the chance for error.

List out all the VMkernel Nics:
esxcfg-vmknic -l

Create a new portgroup first with esxcfg-vswitch then create a vmk port with esxcfg-vmknic, example:
esxcfg-vswitch -a VMkport vSwitch1 esxcfg-vmknic -a -i -n VMkport

In VI3 you can only have one Vmkernel port per vswitch, in vSphere this is changed. It is especially usefully setting up iSCSI multipathing. As the software iSCSI initiator will initiate IO from each iSCSI enabled vmkernel port when using Round Robin as your path selection policy.

ESX Commands: esxcfg-vswitch

Jon Owings — Sun, 22 Nov 2009 17:52:59 +0000

This is a command I use the most often. It is big when I configure Equalogic and MPIO in vSphere. Additionally, many times I show up on site and the network is not configured prior to my arrival. Even if I sent all the configs ahead of time. People like to wait until the last minute. When building the ESX environment then I may build it with the Service Console in the default vlan or in which ever one it is plugged into in the physical network. So oftern the network guy catches up and sets the dot1q trunk and I lose connectivity and I have to go to the console and set the vlans correctly. Like this:
esxcfg-vswitch -v 8 -p "Service Console" vSwitch0
Speaking of iSCSI you will also set your jumbo frames on the vSwitch from this command
esxcfg-vswitch -m 9000 vSwitch1

Of course there is a ton more you can do from this command. Here is some man page action for you:
esxcfg-vswitch(8) VMware ESX Manual esxcfg-vswitch(8)


NAME

     esxcfg-vswitch - VMware ESX Virtual Switch Configuration tool
SYNOPSIS

     esxcfg-vswitch OPTIONS [VSWITCH]
DESCRIPTION

     esxcfg-vswitch provides an interface for adding, removing, and modifying virtual switches and their settings.  By default,

     there is a single virtual switch called vSwitch0.
OPTIONS

     -a --add

             Add a new virtual switch to the system.  It requires a virtual switch name to be provided.
     -d --delete

             Delete a virtual switch.  This will fail if any ports on the virtual switch are still in use by VMkernel networks,

             vswifs, or VMs.
     -l --list

             List all virtual switches and their portgroups.
     -L --link

             Add an uplink to a virtual switch.  This will attach a new unused physical NIC to a virtual switch.
     -U --unlink

             Remove an uplink from a virtual switch.  This will remove a NIC from the uplink list of a virtual switch. If it is

             the last uplink, physical network connectivity for that switch will be lost.
     -R --restore-uplinks

             Restore uplinks for all virtual switches from config file. This will restore all uplinks for each virtual switch from

             configurtion file. INTERNAL USE ONLY.
     -M --add-pg-uplink

             Add an uplink to the list of uplinks for a portgroup
     -N --del-pg-uplink

             Delete an uplink from the list of uplinks for a portgroup
     -P --add-dvp-uplink

             Add an uplink to a DVPort on a DVSwitch. Must specify --dvp in the same commnad.
     -Q --del-dvp-uplink

             Delete an uplink from a  DVPort on a DVSwitch. Must specify --dvp in the same commnad.
     -p --pg

             Provide the name of the portgroup. For the â--vlanâ option,  "ALL" can be specified to operate on all portgroups of a

             virtual switch.
     -V --dvp

             Provide the DVPort ID of a DVSwitch.

 -v --vlan

             Set the VLAN ID for a specific portgroup of a virtuals switch Using the option "0" will disable VLAN for this port-

             group.  Requires that the --pg option is also specified.
     -c --check

             Check to see if a virtual switch exists. The program prints a "1" if it exists; otherwise it prints "0".
     -A --add-pg

             Add a new portgroup to a virtual switch with the given name.
     -D --del-pg

             Delete a portgroup.  This operation will fail if the portgroup is in use.
     -C --check-pg

             Check whether the specified name is in use for a portgroup.  Prints "1" if the name is in use, prints "0" otherwise.
     -B --set-cdp

             Set the CDP status for a given virtual switch.  To set pass one of "down", "listen", "advertise", "both".
     -b --get-cdp

             Print the current CDP setting for this switch.
     -X --set-maxactive

             Set the max active uplinks for the virtual switch.
     -x --get-maxactive

             Get the max active uplinks for the virtual switch.
     -m --mtu

             Set the MTU for the vswitch.  This affects all the NICs attached to the vswitch.
     -r --restore

             Used at system startup to restore configuration.  INTERNAL USE ONLY.
     -h --help

             Print a simple help message.
EXAMPLES

     Add a Virtual Switch:
     esxcfg-vswitch --add vSwitch1
     Add a Portgroup to vSwitch0:
     esxcfg-vswitch --add-pg="New Portgroup" vSwitch0
COPYRIGHT

     VMware ESX is Copyright 1998-2009 VMware, Inc.  All rights reserved.

VMware ESX 4.0 November 22, 2009 VMware ESX 4.0

ESX Commands esxcfg-nics

Jon Owings — Fri, 30 Oct 2009 22:00:16 +0000

I have been missing for a couple weeks again, which means we have been busy doing VMware installs and that is a good thing. Next command in the order is esxcfg-nics. From the command line you can get some good information about the physical nics on your host. Additionally for troubleshooting purposes or configuration you can hard set physical nic speed and duplex.

ESX Commands – esxcfg-nas

Jon Owings — Mon, 05 Oct 2009 23:36:47 +0000

esxcfg-nas

Standard use of this command is to add or list your NFS mounts.

List: esxcfg-nas –l

Add: esxcfg-nas –a –o -s

Not much more I can say. A little more detail here:

http://b2v.co.uk/b2vguide2vmware3.htm

A thread in the communities about a problem someone had where the nfsclient wasn’t loaded:
http://communities.vmware.com/message/864559

So go out and add some NFS datastores!

ESX Commands – esxcfg-mpath

Jon Owings — Thu, 01 Oct 2009 10:32:17 +0000

It has been almost 1 year since I started looking at the esxcfg-* commands. It initially came as a look at the first part of the Enterprise Administration Exam’s Blueprint very first bullet point. In that post I talked about using esxcfg-mpath to identify which luns are fiber, iSCSI, NFS or local.

Today lets look a little bit deeper at the command and how it can be used to help you day to day.

We can always use esxcfg-mpath -l to list all of the luns and their paths. A good thing to check here is that you have the same number of paths to each datastore that comes from the SAN. You may have a zoning issue if a certain lun can only be seen from 1 path rather than all of them. In general each hba will see the lun through each controller in an active active type fiber channel SAN. So hba A should see the lun from Controller A and B. Likewise, hba B should see Controller A and B for a total of 4 paths. If you are using fixed or MRU as the pathing policy only one will be active but esxcfg-mpath -l will show four paths.

Of course if you have more hbas and controllers you will have more paths.

You can follow the examples given by the esxcfg-mpath -h to get help. One useful tool is to create a crude script using esxcfg-mpath –policy with the –lun tag to change the policy from say MRU to Fixed. I am not a perl scripter and I sure someone already has a real shell or perl script to set the policy but I do like to prepare multiple command in notepad then paste them into the cli.

esxcfg-mpath –policy=fixed –lun=vmhba0:0:1
esxcfg-mpath –policy=fixed –lun=vmhba0:0:2
and so on…

Then try to feel really smart by alternating the paths so every fourth lun will use different paths.

esxcfg-mpath –path=vmhba1:0:1 –lun=vmhba0:0:1 –state=on
esxcfg-mpath –path=vmhba2:0:1 –lun=vmhba0:0:2 –state=on
esxcfg-mpath –preferred –path=vmhba1:0:1 –lun=vmhba0:0:1
esxcfg-mpath –preferred –path=vmhba2:0:1 –lun=vmhba0:0:2

The first two lines set the path for the respective luns to different hbas. The last two lines set the preferred path to that same port on the hba. So when there is failover the path will fail back to your set config when all is well.

Rescan All Hba’s Where are you?

Jon Owings — Wed, 17 Jun 2009 13:08:00 +0000

So I was updating some of my blog posts on the esxcfg-* commands with any changes in ESX 4. I wrote earlier I did not know much about the esxcfg-advcfg command. Since writing that post at the end of 2008, I found Duncan Epping used esxcfg-advcfg in 3.5 to set the option rescan all the Hba’s. I thought this was a great shortcut and decided to try it out in vSphere but:

[root@esx4 ~]# esxcfg-advcfg -s 1 /Scsi/ScsiRescanAllHbas
Exception occured: Unable to find option ScsiRescanAllHbas

So I looked through vCenter 4 and did not find the option under Scsi I looked around some in the other Advanced Options and it is no where to be found.

Has this been removed or moved somewhere else? If you know hit me up on twitter @2vcps

ESX Commands – esxcfg-module

Jon Owings — Mon, 08 Jun 2009 17:00:00 +0000

After the last two entries being somewhat boring and not useful at least in my opinion. I am glad this command has a little more to it.

[root@esx1 root]# esxcfg-module -h
Usage: esxcfg-module

-g–get-options Get the options for a given module and whether it is loaded on boot.
-s–set-options Set the options for a given module. WARNING this may be overwritten by per device options.
-e–enable Enable a given module, indicating it should be loaded on boot.
-d–disable Disable a given module, indicating it should not be loaded on boot.
-q–query Query enabled modules options.
-l–list List all modules and whether they are enabled.
-h–help Show this message.
[root@esx1 root]# esxcfg-module -l
Device Driver Modules
Module Enabled Loaded
vmklinux true true
cciss true true
tg3 true true
qla4022 true true
e1000 true true
qla2300_707_vmwtrue truel
vmdriver true true
vmfs3 true true
etherswitch true true
shaper true true
tcpip true true
cosShadow true true
migration true true
nfsclient true true
deltadisk true true
vmfs2 true true
iscsi_mod true true
[root@esx1 root]#

So a common use I have seen with this command is to turn off unused modules. Go ahead and free up some resources turn off vmfs2! You don’t use it.
Another use is to change HBA options.

/usr/sbin/esxcfg-module -s ql2xmaxqdepth=64 qla2300_707_vmw
Remember to follow it with:
/usr/sbin/esxcfg-boot -b

Check out VCDX Master Ninja/Jedi Duncan Epping using this command combo in a scripted install.

ESX Commands – esxcfg-linuxnet

Jon Owings — Fri, 05 Jun 2009 20:00:00 +0000

The guide from VMware.com says

esxcfg-linuxnet
Converts vswif to eth when booting ESX Server into service-console-only mode rather than into ESX mode. This command is used for the bootstrap process and is intended for VMware Technical Support use only. You should not issue this command unless instructed to do so by a VMware Technical Support representative.
There is no VI Client equivalent for this command.

Wow I should have saved all these for one post called stuff you don’t use unless someone smart tells you to.

Don’t worry though I checked ahead esxcfg-module has more too it. I actually slightly looked at it when I covered esxcfg-boot.