Underneath todays objective we have the following topics:
Add Layer 2 Bridging
Connect Layer 2 Bridging to the appropriate distributed virtual port group
So first let’s do a little background on what we are doing and more importantly the why. Layer 2 bridging in this case, is an ability we have in NSX to take a workload that currently only exists in our NSX world and “bridge” that with the outside world. We could use this to reach a physical server being used as a proxy or gateway for example. We create this bridge between a logical switch inside NSX and it routes out to a VLAN. I am going to borrow the picture from the NSX guide to try to simplify it a bit more. (credit to VMware for the pic)
In the above picture you have the NSX VXLAN 5001 that is running our workload inside ESXi. We have a need to communicate to a physical workload labeled as such. In order to do that, we have an NSX Edge logical router that has L2 bridging enabled on it. The Bridging tab itself will allow us to choose a logical switch and distributed port group that will be connected together. To do this here are the following steps:
If you don’t already have one, you will need to deploy a new Logical Router. To do that, you will need to go to the NSX Edges subsection of the Networking and Security screen of NSX.
Click on the green + icon on the middle pane
The first information you will need to fill out will be Install Type, and Name. The rest of the options we won’t go over in this walkthrough.
We will need to select Logical Router as the Install Type and then type in a name.
On the next screen, we will need to input a password for the Edge device.
On the Configure Deployment Screen, we will need to add an actual appliance here by clicking on the green + icon.
This popups with a screen for us to select where we wish to place the device’s compute and storage resources.
On the Configure Interfaces screen, I’ve chosen to connect it to my management network. You don’t really need to configure an interface as the actual bridging work will be done by a different mechanism.
You can click past the Default Gateway screen.
Click Finish on the Ready to Complete screen and away you go.
Now the actual bridging mechanism is found by going into the Edge itself
Double click on the Edge device you are going to use for bridging.
Click on Manage, then on Bridging tabs in the center pane.
To add a bridge, click on the green + arrow
Give the Bridge a name, select the Logical Switch you are bridging, and the VLAN Port Group you will be bridging to. (Just as a side note, none of the normal dv Port Groups will show up unless you have a VLAN assigned to them. Something I discovered while writing this )
Once you click Ok, you will exit out to the Bridging screen again, and you will now need to publish your changes to make it work.
Once published, you will have a Bridging ID
You can have more than one Bridge using the same Edge device, but they won’t be able to bridge the same networks. In otherwords you can’t use a bridge to connect the same VXLAN to two different VLAN Port Groups.
And that covers this objective. Stay tuned for the next objective!
Recovering from dual hernia surgery and changing job roles…….it’s me and I’m back. Moving back into the Blueprint, we are working on Objective 2.1 – Create and Manage Logical Switches. We will be covering the following points in this blog post.
Create and Delete Logical Switches
Assign and configure IP addresses
Connect a Logical Switch to an NSX edge
Deploy services on a Logical Switch
Connect/Disconnect virtual machines to/from a Logical Switch
Test Logical Switch connectivity
First it would probably be appropriate to make sure that we know what a logical switch can do. Just like its physical counterpart, an NSX switch can create a logical broadcast domain and segment. This keeps broadcasts from one switch from spilling over to another and saving network bandwidth. Feasibly you can argue that the network bandwidth is a bit more precious than real network bandwidth because it requires not only real network bandwidth but also requires processing on the side of the hosts (whereas normal network bandwidth would be processed by the ASIC on the physical network switch).
A logical switch is mapped to a unique VXLAN which then encapsulates the traffic and carries it over the physical network medium. The NSX controllers are the main center where all the logical switches are managed.
In order to add a logical switch, you must obviously have all the needed components setup and installed (NSX manager, controllers, etc) I am guessing you have already done that.
In the vSphere Web Client, navigate to Home > Networking & Security > Logical Switches.
If your environment has more than one NSX Manager, you will need to select the one you wish to create the switch on, and if you are creating a Universal Logical Switch, you will need to select the primary NSX Manager.
Click on the green ‘+’ symbol.
Give it a name and optional description
Select the transport zone where you wish this logical switch to reside. If you select a Universal Transport Zone, it will create a Universal Logical Switch.
You can click Enable IP Discovery if you wish to enable ARP suppression. This setting is enabled by default. This setting will minimize ARP flooding on this segment.
You can click Enable MAC learning if you have VMs that have multiple MAC addresses or Virtual NICs that are trunking VLANs.
The next point, assign and configure IP addresses, is a bit confusing. There is no IP address you can “assign” to just the logical switch. There is no interface on the switch itself. What I am guessing they meant to say here was that you should be familiar with adding an Edge Gateway interface to a switch, and adding a VM to the switch. Both of these would in a roundabout way assign and configure a subnet or IP address to a logical switch. That’s the only thing I can think of anyways.
The next bullet point is, connecting a logical switch to an NSX Edge. This is done quickly and easily.
While you are in the Logical Switches section (Home > Networking & Security > Logical Switches), you would then click on the switch you want to add the Edge device to.
Next, click the Connect an Edge icon.
Select the Edge device that you wish to connect to the switch.
Select the interface that you want to use.
Type a name for the interface
Select whether the link will be internal or uplink
Select the connectivity status. (Connected or not)
If the NSX Edge you are connecting has Manual HA Configuration selected, you will need to input both management IP addresses in CIDR format.
Optionally, edit the MTU
Click Next and then Finish
The next bullet point covers deploying services on a logical switch. This is accomplished easily by:
Click on Networking & Security and then click on Logical Switches.
Select the logical switch you wish to deploy services on.
Click on the Add Service Profile Icon.
Select the service and service profile that you wish to apply.
There is an important caveat here, the icon will not show up unless you have already installed the third party virtual appliance in your environment. Otherwise your installation will look like mine and not have that icon.
The next bullet point, Connecting and Disconnecting VMs from a Logical Switch is also simply done.
While in the Logical Switch section (kind of a theme here huh?), right click on the switch you wish to add the VM to.
You have the option to Add or Remove VMs from that switch – as shown here in the pic
The final point, testing connectivity, can be done numerous ways. The simplest way would just be to test a ping from one VM to another. This could be done on pretty much any VM with an OS on it. You can even test connectivity between switches (provided there is some sort of routing setup between them. If you only had one VM on that segment (switch) but you had a Edge on it as well, you could pin the Edge interface from the VM as well. There are many ways to test connectivity. And with that, this post draws to a close. I will be back soon with the next Objective Point 2.2 Configure and Manage Layer 2 Bridging.
As mentioned above the next objective is preparing your environment for network virtualization. We will cover the following topics specified in the blueprint.
Prepare vSphere Distributed Switching for NSX
Prepare a cluster for NSX
Add / Remove Hosts from cluster
Configure appropriate teaming parameters for a given implementation
Configure VXLAN Transport parameters according to a deployment plan
Kicking off with preparing the distributed switching for NSX… First, we need to cover a little about distributed switches. A lot of people, myself included, just use standard switches due to the simplicity of them. Like an unmanaged hardware switch, there isn’t much that can go wrong with it. It either works or it doesn’t. There are a number of things you are missing out with however, by not using distributed switches.
Distributed Switches can:
Shape Inbound traffic
Be managed through a central location (vCenter)
Support PVLANs (yeah I don’t know anybody using these)
The main takeaway though, if you didn’t already know, is that NSX won’t be able to do its job without distributed switches.
To prepare for NSX you will need to make sure that all the distributed switches are created and hosts are joined to them. There will be different setups that will all be dependent on environments. You can join hosts to multiple distributed switches if need be. Most sample setups will have you separate out your compute and management hosts and keep them on separate switches. There are advantages to doing it this way but it can add complexity. Just make sure if you are doing it this way you know the reasons why and it makes sense for you. The other main thing to realize is that a minimum MTU frame size of 1600 bytes is required. This is due to the additional overhead that VXLAN encapsulation creates.
For the purposes of the test I am going to assume that they will want you to know about the MTU, and how to add and remove hosts/vmkernel ports/VMs from a distributed switch. This IS something you should probably already know if you have gone through VCP level studies. If you don’t feel free to reach out to me and we’ll talk, or reference one of the VMware books, Hands on Labs, or other materials that can assist.
Next objective is preparing the cluster/s for NSX.
What are we doing when we prepare the cluster? The VMware installation bundles are loaded onto the hosts and installed. The number of VIBs installed depends on the version of NSX and ESXi installed. If you do need to look for them these are what they will be called, and in the following groups.
When we click on Host Preparation tab in Installation, we are presented with clusters. Select the cluster desired, and then click on Actions and Install. This will kick off the installation. -Note: If you are using stateless mode (non-persistent state across reboots) you will need to manually add them to the image.
A few other housekeeping things. I’d imagine you already have things like DNS sorted. But if you didn’t before, make sure the little stuff is sorted. If you don’t weird issues can pop up at the worst time.
To check to see the VIB installed on your ESXi hosts, open SSH on them and type in the following:
Esxcli software vib list | grep esx
This will, regardless of version, give you all the installed VIBs with ESX in the name.
In order to add a new host to an already prepared cluster, do the following:
Add the server as a regular host
Add the host to the distributed switch that the other hosts are part of and that is used for NSX
Place the host into maintenance mode
Add the host to the cluster
Remove the host from maintenance mode
The host, when it is added to the cluster will automatically be installed with the necessary VIBs for NSX. DRS will also balance machines over to the new host.
To remove a host from a prepared cluster:
Place the host in maintenance mode
Remove host from the cluster
Make sure VIBs are removed and then place host how you want it.
Configure appropriate teaming policy for a given implementation is next. I am going to lift some information from a Livefire class I just went through for this. First, when NSX is deployed to the cluster, a VXLAN port-group is created automatically. The teaming option on this should be the same across all ESXi hosts and across all clusters using that VDS. You can see the port group in my environment that is created for the VTEPs
You choose the teaming option when you configure the VXLAN in the Host Preparation tab. The Teaming mode determines the number of VTEPs you can use.
Route based on originating port = Multi VTEP = Uplinks both active
Route based on MAC hash = Multi VTEP = Uplinks both active
LACP = Single VTEP = Flow Based
Route Based on IP Hash = Single VTEP = Flow based
Explicit failover = Single VTEP = One Active
It is recommended you use source port. The reasoning behind this is so you don’t have a single point of failure. Single VTEPs would essentially cripple the host and VMs that resided on it until failover occurred or it was brought back online.
Configure VXLAN Transport parameters according to deployment plan is last in this objective. This most likely covers configuring VXLAN on the Host Preparation page and then configuring a Segment ID range on the Logical Network tab.
When you prepare the VXLAN on the host prep tab, this involves setting the VDS you are going to use, a VLAN ID (even if default), an MTU size, and a NIC teaming policy. One interesting thing is if your VDS switch is set to a lower MTU size, by changing here, it will also change the VDS to match the VXLAN MTU. The number of VTEPs are not editable in the UI here. You can set the VTEPs to be assigned an IP with an IP Pool that can be setup during this. You can go back later to add or change parameters of the IP Pool or even add IP Pools by going to the NSX Manager, managing it, and then going to Grouping Objects.
When everything is configured it will look similar to this:
Going to the next button, takes you the Segment ID. You can create one here, if you need to create more than one segment ID, you will need to do it via API. Remember Segment IDs are essentially the number of Logical Switches you can create. While you can technically create more than 16 million, you are limited to 10,000 dvPortGroups in vCenter. A much smaller subset is usually used. Here is mine. Since it’s a home lab I’m not likely going to be butting up against that 10k limit any time soon.
And that’s the end of 1.2 Objective. Next up is the exciting world of Transport Zones in 1.3.
It has been a remarkably long time since my last post, and I apologize for that. Things got in the way…Such as my own laziness, job, laziness. You get the idea.
This blog post was conceived because of the lack of posts out there for this. Granted I may just be dense but it took me a while and some help to get this working and I used a previous blow post from another author for this. This post here http://blog.bertello.org/2015/07/building-a-basic-3-tier-application-for-your-home-lab/ was used as a template but there were a number of problems and things that were left out that caused me issues. So, I took it upon myself to correct those small things and repost it. In full disclosure, I did try to reach out to the blog author, but have not heard back from him yet.
To start out with a bit about my enviro. I created a couple of VMs using my home lab setup of vSphere 6.5. I don’t have anything fancy in it right now, especially since NSX doesn’t run on 6.5 currently. I started the VMs out with what vSphere automatically provisioned for the VMs, 1 vCPU, 2Gb of RAM, and 16GB HD. This can be reduced of course since I am just using CentOS 6.8 minimal install CD and don’t believe there will be a lot of traffic that they need to handle. I ran through the graphical setup and setup a hostname and IP address on each of the machines. The goal of course is to have these machines eventually be on separate network tiers to test out all the features available to us in NSX, such as micro-segmentation. (of course this is once NSX is supported on 6.5 vSphere)
I am using CentOS 6.8 (which is the latest release on 6.x as of this writing) and the main reason why is that I am more familiar with 6.x than 7. Also Linux is free and easy to deploy and doesn’t take much in the way of resources, providing a perfect OS to use. The first thing we need to do is disable the firewall. This IS a lab environment so I am not too worried about hackers etc., and I will be adding NSX firewalls on them later. To accomplish this, type the following:
service iptables save
service iptables stop
chkconfig iptables off
You will do this for both machines. We will concentrate on the database server first. This is only going to be a 2 tier app. We will have a Database server and a Web/PHP/Wordpress server. You can add more however you want to but this is a good start. Perhaps for the third you could add proxy like the blog post above. Personally, I was just going to put the client machine on it to access the first two. But it is all up to you – it’s your world, and if you want a happy little tree in there, you put one in there. J
Database Server Config
We are going to use MySQL like the original blog.
yum install -y mysql mysql-server mysql-devel
The above line will install all the needed pieces of SQL that we will need. We now need to start the service, set it to run at start up, and go through the small setup of creating a admin password and deciding whether we want a default database in addition to the one we create and if we want to allow anonymous users and remote root login.
service mysqld start
chkconfig mysqld on
Also another thing I should note is that it is much easier to copy and paste my commands. To do this I would recommend using puTTY. We are now going to create our database and set permissions for it.
mysql -u root -p
SELECT User, Host, Password FROM mysql.user;
CREATE DATABASE wordpress;
CREATE USER wp_svc@localhost;
CREATE USER wp_svc@’%’;
SET PASSWORD FOR wp_svc@localhost=PASSWORD(“Password123”);
GRANT ALL PRIVILEGES ON wordpress.* TO wp_svc@localhost IDENTIFIED BY ‘Password123’;
GRANT ALL PRIVILEGES ON wordpress.* TO ‘wp_svc’@’%’ IDENTIFIED BY ‘Password123’;
You can change the above to whatever parameters you wish, just write them down as you will need them later. I also bound MySQL to the IP address you can do that at /etc/my.cnf if you wish. The code is below.
Obviously, you would change the IP address to the one you are using. And that’s it for the DB.
First thing we need to do on this machine is disable the firewall again. We also need to disable SELINUX since if we don’t, our packets will never leave this machine (something I struggled with and finally got the help of my good friend Roger H. in order to figure out. Shameless plug for him at his blog here http://www.rhes-tech.com/ – I highly recommend you check him out as he is a brain when it comes to Linux things. So here is the code we need:
service iptables save
service iptables stop
chkconfig iptables off
In order to disable SELINUX from making our life horrible, we are going to set it to Permissive mode. If we fully disable it, it could scream at us. Therefore, use your favorite text editor and edit /etc/sysconfig/selinux file and you want to change the SELINUXTYPE=targeted. It will look like this :
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing – SELinux security policy is enforced.
# permissive – SELinux prints warnings instead of enforcing.
# disabled – SELinux is fully disabled.
# SELINUXTYPE= type of policy in use. Possible values are:
# targeted – Only targeted network daemons are protected.
# strict – Full SELinux protection.
# SETLOCALDEFS= Check local definition changes
Next we are going to install a ton of stuff.
yum install -y httpd
chkconfig –levels 235 httpd on
The above installs Apache web server and starts it at machine start up. Next we need to install PHP as this is what WordPress requires to run. We will also install the supporting modules.
Next we will download the latest version of WordPress (as of this scribbling 4.7) and we will then need to unzip it and then copy it over to the webserver www home directory. Then we will need to add the config to point back to the DB server.
Again, using your favorite text editor open the wp-config.php file and change it like below. If you chose different values for your database name and username/password you will need to use that info now.
// ** MySQL settings – You can get this info from your web host ** //
/** The name of the database for WordPress */
/** MySQL database username */
/** MySQL database password */
/** MySQL hostname */
/** Database Charset to use in creating database tables. */
/** The Database Collate type. Don’t change this if in doubt. */
Once this is done you can go to your website to finish the WordPress install. The address should look something like this. You can use the FQDN or IP address.