VCF 5.2 Node addition from SDDC was failing with the error 504 Gateway Timeout"

During one of my recent deployment i have face this issue node addition Here's a suggested outline for your blog on resolving the "504 Gateway Timeout" error during node addition from SDDC Manager

While Add a new node to VCF on VxRail During Node Discovering on SDDC GUI the Node Addition will fail with Error " "Failed to load Host cluster details. Http failure response for

https://sddcmangerfqdn.xxx.xxx/ui/api/v1/clusters/044192c6-b42a-44a1-bb39-fb348f05b43a/hosts/queries/46251b8f-e4ad-4cbc-99c7-1df5d631f815:504 Gateway Timeout"

Affected Environment VCF 5.2 & 5.2.1 

Workaround : 

1. Take a snapshot of SDDC Manager VM 

2. Fetch the Cluster id Go to SDDC GUI → Developer Center → API Explore → Cluster → GET → /v1/clusters 

3. Fetch the hostname , IPAddress , Username , Password and fill it in the below format . 

   
   

   Example:

   
   

   {

   "clusterExpansionSpec": {

   "hostSpecs": [

   {

   "ipAddress": "xx.xx.xx.xx",

   "hostName" : "xxxxxxxxxxx",

   "username" : "root",

   "password" : "xxxxxxxx"

   },

   {

   "ipAddress": "xxxxxxxx",

   "hostName" : "xxxxxxxxxxx",

   "username" : "root",

   "password" : "xxxxxxxxxxx"

   }

   ],

   "interRackExpansion":false

   }

   }

   
   
   
   

4. Go to SDDC GUI → Developer Center → API Explore → Cluster → PATCH /v1/clusters/{id} → Click Execute 

   

Under Id : fill the cluster id which we got from step 2 

Under Body : fill the format from step 3 .

5. This will start the task on SDDC UI and the output you will see it as IN Progress

   

6. After 15 - 20mins this Task will completed , and verify the post check validation .