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Configuring NSX-v Load Balancer for use with vSphere Platform Services Controller (PSC) 6.0

Romain DeckerBy Romain Decker

VMware introduced a new component with vSphere 6, the Platform Services Controller (PSC). Coupled with vCenter, the PSC provides several core services, such as Certificate Authority, License service and Single Sign-On (SSO).

Multiple external PSCs can be deployed serving one (or more) service, such as vCenter Server, Site Recovery Manager or vRealize Automation. When deploying the Platform Services Controller for multiple services, availability of the Platform Services Controller must be considered. In some cases, having more than one PSC deployed in a highly available architecture is recommended. When configured in high availability (HA) mode, the PSC instances replicate state information between each other, and the external products (vCenter Server for example) interact with the PSCs through a load balancer.

This post covers the configuration of an HA PSC deployment with the benefits of using NSX-v 6.2 load balancing feature.

Due to the relationship between vCenter Server and NSX Manager, two different scenarios emerge:

  • Scenario A where both PSC nodes are deployed from an existing management vCenter. In this situation, the management vCenter is coupled with NSX which will configure the Edge load balancer. There are no dependencies between the vCenter Server(s) that will use the PSC in HA mode and NSX itself.
  • Scenario B where there is no existing vCenter infrastructure (and thus no existing NSX deployment) when the first PSC is deployed. This is a classic “chicken and egg” situation, as the NSX Manager that is actually responsible for load balancing the PSC in HA mode is also connected to the vCenter Server that use the PSC virtual IP.

While scenario A is straightforward, you need to respect a specific order for scenario B to prevent any loss of connection to the Web client during the procedure. The solution is to deploy a temporary PSC in a temporary SSO site to do the load balancer configuration, and to repoint the vCenter Server to the PSC virtual IP at the end.

Please note that scenario B is only supported with vSphere 6.0 as repointing a vCenter between sites in a SSO domain is no longer supported in vSphere 6.5 (KB 2131191).

Both scenario steps are summarized in the workflow below.

RDecker PSC Map

Environment

NSX Edge supports two deployment modes: one-arm mode and inline mode (also referred to as transparent mode). While inline mode is also possible, NSX load balancer will be deployed in a one-arm mode in our situation, as this model is more flexible and because we don’t require full visibility into the original client IP address.

Description of the environment:

  • Software versions: VMware vCenter Server 6.0 U1 Appliance, ESXi 6.0 U1, NSX-v 6.2
  • NSX Edge Services Gateway in one-arm mode
  • Active/Passive configuration
  • VLAN-backed portgroup (distributed portgroup on DVS)
  • General PSC/vCenter and NSX prerequisites validated (NTP, DNS, resources, etc.)

To offer SSO in HA mode, two PSC servers have to be installed with NSX load balancing them in active/standby mode. PSC in Active/Active mode is currently not supported by PSC.

The way SSO operates, it is not possible to configure it as active/active. The workaround for the NSX configuration is to use an application rule and to configure two different pools (with one PSC instance in each pool). The application rule will send all traffic to the first pool as long as the pool is up, and will switch to the secondary pool if the first PSC is down.

The following is a representation of the NSX-v and PSC logical design.

RDecker PSC NSX

Procedure

Each step number refers to the above workflow diagram. You can take snapshots at regular intervals to be able to rollback in case of a problem.

Step 1: Deploy infrastructure

This first step consists of deploying the required vCenter infrastructure before starting the configuration.

A. For scenario A: Deploy two PSC nodes in the same SSO site.

B. For scenario B:

  1. Deploy a first standalone Platform Services Controller (PSC-00a). This PSC will be temporary used during the configuration.
  2. Deploy a vCenter instance against the PSC-00a just deployed.
  3. Deploy NSX Manager and connect it to the vCenter.
  4. Deploy two other Platform Services Controllers in the same SSO domain (PSC-01a and PSC-02a) but in a new site. Note: vCenter will still be pointing to PSC-00a at this stage. Use the following options:
    RDecker PSC NSX Setup 1RDecker PSC NSX Setup 2

Step 2 (both scenarios): Configure both PSCs as an HA pair (up to step D in KB 2113315).

Now that all required external Platform Services Controller appliances are deployed, it’s time to configure high availability.

A. PSC pairing

  1. Download the PSC high availability configuration scripts from the Download vSphere page and extract the content to /ha on both PSC-01a and PSC-02a nodes. Note: Use the KB 2107727 to enable the Bash shell in order to copy files in SCP into the appliances.
  2. Run the following command on the first PSC node:
    python gen-lb-cert.py --primary-node --lb-fqdn=load_balanced_fqdn --password=<yourpassword>

    Note: The load_balanced_fqdn parameter is the FQDN of the PSC Virtual IP of the load balancer. If you don’t specify the option –password option, the default password will be « changeme ».
    For example:

    python gen-lb-cert.py --primary-node --lb-fqdn=psc-vip.sddc.lab --password=brucewayneisbatman
  3. On the PSC-01a node, copy the content of the directory /etc/vmware-sso/keys to /ha/keys (a new directory that needs to be created).
  4. Copy the content of the /ha folder from the PSC-01a node to the /ha folder on the additional PSC-02a node (including the keys copied in the step before).
  5. Run the following command on the PSC-02a node:
python gen-lb-cert.py --secondary-node --lb-fqdn=load_balanced_fqdn --lb-cert-folder=/ha --sso-serversign-folder=/ha/keys

Note: The load_balanced_fqdn parameter is the FQDN of the load balancer address (or VIP).

For example:

python gen-lb-cert.py --secondary-node --lb-fqdn=psc-vip.sddc.lab --lb-cert-folder=/ha --sso-serversign-folder=/ha/keys

Note: If you’re following the KB 2113315 don’t forget to stop the configuration here (end of section C in the KB).

Step 3: NSX configuration

An NSX edge device must be deployed and configured for networking in the same subnet as the PSC nodes, with at least one interface for configuring the virtual IP.

A. Importing certificates

Enter the configuration of the NSX edge services gateway on which to configure the load balancing service for the PSC, and add a new certificate in the Settings > Certificates menu (under the Manage tab). Use the content of the previously generated /ha/lb.crt file as the load balancer certificate and the content of the /ha/lb_rsa.key file as the private key.

RDecker PSC Certificate Setup

B. General configuration

Enable the load balancer service and logging under the global configuration menu of the load balancer tab.

RDecker PSC Web Client

C. Application profile creation

An application profile defines the behavior of a particular type of network traffic. Two application profiles have to be created: one for HTTPS protocol and one for other TCP protocols.

Parameters HTTPS application profile TCP application profile
Name psc-https-profile psc-tcp-profile
Type HTTPS TCP
Enable Pool Side SSL Yes N/A
Configure Service Certificate Yes N/A

Note: The other parameters shall be left with their default values.

RDecker PSC Edge

D. Creating pools

The NSX load balancer virtual server type HTTP/HTTPS provide web protocol sanity check for their backend servers pool. However, we do not want that sanity check their backend servers pool for the TCP virtual server. For that reason, different pools must be created for the PSC HTTPS virtual IP and TCP virtual IP.

Four pools have to be created: two different pools for each virtual server (with one PSC instance per pool). An application rule will be defined to switch between them in case of a failure: traffic will be send to the first pool as long as the pool is up, and will switch to the secondary pool if the first PSC is down.

Parameters Pool 1 Pool 2 Pool 3 Pool 4
Name pool_psc-01a-http pool_psc-02a-http pool_psc-01a-tcp pool_psc-02a-tcp
Algorithm ROUND-ROBIN ROUND-ROBIN ROUND-ROBIN ROUND-ROBIN
Monitors default_tcp_monitor default_tcp_monitor default_tcp_monitor default_tcp_monitor
Members psc-01a psc-02a psc-01a psc-02a
Monitor Port 443 443 443 443

Note: while you could use a custom HTTPS healthcheck, I selected the default TCP Monitor in this example.

RDecker PSC Edge 2 (Pools)

E. Creating application rules

This application rule will contain the logic that will perform the failover between the pools (for each virtual server) corresponding to the active/passive behavior of the PSC high availability mode. The ACL will check if the primary PSC is up; if the first pool is not up the rule will switch to the secondary pool.

The first application rule will be used by the HTTPS virtual server to switch between the corresponding pools for the HTTPS backend servers pool.

# Detect if pool "pool_psc-01a-http" is still UP
acl pool_psc-01a-http_down nbsrv(pool_psc-01a-http) eq 0
# Use pool " pool_psc-02a-http " if "pool_psc-01a-http" is dead
use_backend pool_psc-02a-http if pool_psc-01a-http_down

The second application rule will be used by the TCP virtual server to switch between the corresponding pools for the TCP backend servers pool.

# Detect if pool "pool_psc-01a-tcp" is still UP
acl pool_psc-01a-tcp_down nbsrv(pool_psc-01a-tcp) eq 0
# Use pool " pool_psc-02a-tcp " if "pool_psc-01a-tcp" is dead
use_backend pool_psc-02a-tcp if pool_psc-01a-tcp_down

RDecker PSC Edge 3 (app rules)

F. Configuring virtual servers

Two virtual servers have to be created: one for HTTPS protocol and one for the other TCP protocols.

Parameters HTTPS Virtual Server TCP Virtual Server
Application Profile psc-https-profile psc-tcp-profile
Name psc-https-vip psc-tcp-vip
IP Address IP Address corresponding to the PSC virtual IP
Protocol HTTPS TCP
Port 443 389,636,2012,2014,2020*
Default Pool pool_psc-01a-http pool_psc-01a-tcp
Application Rules psc-failover-apprule-http psc-failover-apprule-tcp

* Although this procedure is for a fresh install, you could target the same architecture with SSO 5.5 being upgraded to PSC. If you plan to upgrade from SSO 5.5 HA, you must add the legacy SSO port 7444 to the list of ports in the TCP virtual server.

RDecker PSC Edge 4 (VIP)

Step 4 (both scenarios)

Now it’s time to finish the PSC HA configuration (step E of KB 2113315). Update the endpoint URLs on PSC with the load_balanced_fqdn by running this command on the first PSC node.

python lstoolHA.py --hostname=psc_1_fqdn --lb-fqdn=load_balanced_fqdn --lb-cert-folder=/ha --user=Administrator@vsphere.local

Note: psc_1_fqdn is the FQDN of the first PSC-01a node and load_balanced_fqdn is the FQDN of the load balancer address (or VIP).

For example:

python lstoolHA.py --hostname=psc-01a.sddc.lab --lb-fqdn=psc-vip.sddc.lab --lb-cert-folder=/ha --user=Administrator@vsphere.local

Step 5

A. Scenario A: Deploy any new production vCenter Server or other components (such as vRA) against the PSC Virtual IP and enjoy!

B. Scenario B

Please note that scenario B is only supported with vSphere 6.0 as repointing a vCenter between sites in a SSO domain is no longer supported in vSphere 6.5 (KB 2131191).

The situation is the following: The vCenter is currently still pointing to the first external PSC instance (PSC-00a), and two other PSC instances are configured in HA mode, but are not used.

RDecker Common SSO Domain vSphere

Introduced in vSphere 6.0 Update 1, it is now possible to move a vCenter Server between SSO sites within a vSphere domain (see KB 2131191 for more information). In our situation, we have to re-point the existing vCenter that is currently connected to the external PSC-00a to the PSC Virtual IP:

  1. Download and replace the cmsso-util file on your vCenter Server using the actions described in the KB 2113911.
  2. Re-point the vCenter Server Appliance to the PSC virtual IP to the final site by running this command:
/bin/cmsso-util repoint --repoint-psc load_balanced_fqdn

Note: The load_balanced_fqdn parameter is the FQDN of the load balancer address (or VIP).

For example:

/bin/cmsso-util repoint --repoint-psc psc-vip.sddc.lab

Note: This command will also restart vCenter services.

  1. Move the vCenter services registration to the new SSO site. When a vCenter Server is installed, it creates service registrations that it issues to start the vCenter Server services. These service registrations are written to a specific site of the Platform Services Controller (PSC) that was used during the installation. Use the following command to update the vCenter Server services registrations (parameters will be asked at the prompt).
/bin/cmsso-util move-services

After the command, you end up with the following.

RDecker PSC Common SSO Domain vSphere 2

    1. Log in to your vCenter Server instance by using the vSphere Web Client to verify that the vCenter Server is up and running and can be managed.

RDecker PSC Web Client 2

In the context of the scenario B, you can always re-point to the previous PSC-00a if you cannot log, or if you have an error message. When you have confirmed that everything is working, you can remove the temporary PSC (PSC-00a) from the SSO domain with this command (KB 2106736​):

cmsso-util unregister --node-pnid psc-00a.sddc.lab --username administrator@vsphere.local --passwd VMware1!

Finally, you can safely decommission PSC-00a.

RDecker PSC Common SSO Domain vSphere 3

Note: If your NSX Manager was configured with Lookup Service, you can update it with the PSC virtual IP.

Resources:


Romain Decker is a Senior Solutions Architect member of Professional Services Engineering (PSE) for the Software-Defined Datacenter (SDDC) portfolio – a part of the Global Technical & Professional Solutions (GTPS) team.

148 thoughts on “Configuring NSX-v Load Balancer for use with vSphere Platform Services Controller (PSC) 6.0

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  5. TRen

    Great article. I would like to know if the stand-alone NSX Edge appliance can be used as the load balancer instead of relying on NSX Manager? I’m thinking if yes, then wouldn’t that remove the “chicken and egg” issue?

    Reply
    1. TRen

      LOL disregard my question. I just realized that the NSX stand-alone edge appliance is not a full appliance but “Deploys a standalone Edge as the L2 VPN client when a site that is chosen to be stretched is not backed by NSX. ”

      I guess we still have the chicken/egg scenario.

      Reply
  6. Rhian Cohen

    Is there an article for re-pointing a Windows vCenter Server (not an appliance) to the PSC virtual IP?
    Thanks

    Reply
  7. Rhian Cohen

    Why do PSC-01a and PSC-02a have to be configured as a different site? Is there a reason why we cannot set up 2 new PSCs in the same SSO domain (vsphere.local) and same site?

    Thanks

    Reply
    1. Romain Decker

      Hi,
      I’m not sure I understand what you are asking as PSC-01a and PSC-02a are configured in the same SSO site.

      Reply
  8. Alexander

    After create Virtual Server psc-tcp-vip Edge create DNAT Rule with wrong format Port Range (separated by a comma). After that create new custom NAT Rules impossible – Publish Changes button callback Alert window with error text like: Invalid Port 22,389,636,2012,2014,2020 has been specified for field rules.natRulesDtos[0].originalPort. Valid values are 0 to 65535. =(

    Have any idea?

    Reply
  9. NISHANT

    we are deploying Scenario B but during vCenter repointing to PSC VIP ip by running repointing script but it failed with LDAP error. Do we have any solution to fix it

    Reply
  10. Jason Pierce

    HI,

    Great article thanks. I’ve followed it and everything works as expected with 1 exception.
    Even after repointing the VCSA at the VIP and moving the Services from the Temp Site to the Prod Site, I’m still seeing 4 nodes in System Configuration.
    2x Prod PSC’s
    1x VCSA
    1x Temp PSC that was setup originally.

    I’ve removed the Temp PSC from inventory, restarted all VM’s but it’s still there.

    Running cmsso-util unregister –node-pnid Platform-Services-Controller-System-Name –username administrator@your_domain_name –passwd vCenter-Single-Sign-On-password
    returns “Could not find a host id which maps Hostname to in Component Manager Failed!!!”

    After this I ran “vdcleavefed -h TempPSC.testlab.local -u Administrator -w Password!”

    but, still see the 4 nodes

    Reply
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