Solr connectivity issue in Azure

Question

I have setup Sitecore 10.3 instance in Azure and Solr hosted in Azure VM machine. Solr is not connecting and we are getting the below exception.

Job started: Sitecore.ContentSearch.SolrProvider.Agents.IndexingStateSwitcher
ManagedPoolThread #3 07:27:34 INFO  Job started: Sitecore.Tasks.DatabaseAgent
ManagedPoolThread #3 07:27:34 INFO  Scheduling.DatabaseAgent started. Database: master
ManagedPoolThread #3 07:27:34 INFO  Examining schedules (count:0)
ManagedPoolThread #3 07:27:34 INFO  Job ended: Sitecore.Tasks.DatabaseAgent
ManagedPoolThread #4 07:27:34 WARN  **IsOnline: Test connection has failed with an exception. Type: 'SolrConnectionException', Message: 'The remote name could not be resolved: 'intdev-solr.atcc.org''**
ManagedPoolThread #4 07:27:34 INFO  Job ended: Sitecore.ContentSearch.SolrProvider.Agents.IndexingStateSwitcher
ManagedPoolThread #3 07:27:34 INFO  Job started: Sitecore.Tasks.HtmlCacheClearAgent
ManagedPoolThread #3 07:27:34 INFO  Job ended: Sitecore.Tasks.HtmlCacheClearAgent
ManagedPoolThread #5 07:27:34 INFO  Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #5 07:27:34 INFO  Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #2 07:27:34 INFO  Job started: Sitecore.Tasks.DatabaseAgent
ManagedPoolThread #2 07:27:34 INFO  Scheduling.DatabaseAgent started. Database: master
ManagedPoolThread #2 07:27:34 INFO  Examining schedules (count:5)
ManagedPoolThread #2 07:27:34 INFO  Not due: Reset Failed Automated Messages
ManagedPoolThread #2 07:27:34 INFO  Not due: Missing
ManagedPoolThread #2 07:27:34 INFO  Not due: Older
ManagedPoolThread #2 07:27:34 INFO  Not due: Recent
ManagedPoolThread #2 07:27:34 INFO  Not due: Today
ManagedPoolThread #2 07:27:34 INFO  Job ended: Sitecore.Tasks.DatabaseAgent (units processed: 5)
4636 07:27:36 WARN  [Index=sitecore_testing_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
8432 07:27:36 WARN  [Index=sitecore_fxm_master_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
3552 07:27:36 WARN  [Index=sitecore_marketing_asset_index_master] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
3612 07:27:36 WARN  [Index=sitecore_master_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
3776 07:27:42 WARN  [Index=sitecore_testing_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
6768 07:27:42 WARN  [Index=sitecore_marketing_asset_index_master] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
8756 07:27:42 WARN  [Index=sitecore_fxm_master_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
4636 07:27:42 WARN  [Index=sitecore_master_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
ManagedPoolThread #6 07:27:44 INFO  Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #6 07:27:44 INFO  Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
8356 07:27:48 WARN  [Index=sitecore_testing_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
4656 07:27:48 WARN  [Index=sitecore_master_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
6768 07:27:48 WARN  [Index=sitecore_marketing_asset_index_master] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
8432 07:27:48 WARN  [Index=sitecore_fxm_master_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
ManagedPoolThread #2 07:27:54 INFO  Job started: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
ManagedPoolThread #2 07:27:54 INFO  Job ended: Sitecore.ListManagement.Operations.UpdateListOperationsAgent
4656 07:27:54 WARN  [Index=sitecore_master_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
8384 07:27:54 WARN  [Index=sitecore_fxm_master_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
4636 07:27:54 WARN  [Index=sitecore_testing_index] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.
7844 07:27:54 WARN  [Index=sitecore_marketing_asset_index_master] IntervalAsynchronousUpdateStrategy triggered but muted. Indexing is paused.

We have checked in-bound and out-bound rules and allowed my Solr port.

Could anyone please help me here if any one has faced similar issue. Thanks!

Answer 1

Based on the comments above, I can see that the reason for the initial exception is that your DNS has not been correctly configured for the sub domain intdev-solr.atcc.org

Therefore you need to either correctly register the intdev-sol sub domain (with who ever controls the main domain i.e. atcc.org).

Or you need to add a local DNS rule on the machines trying to reach it. If the machine is a windows machine, then you should be able to do this as follows:

1. find the IP address of the SOLR VM (this can be external or internal if all VMS in same azure subscription)
2. open notepad as administrator
3. open C:\Windows\System32\drivers\etc\hosts
4. add entry at bottom of file: <your-solr-ip-address> intdev-solr.atcc.org

Update

I thought of one further option you might consider. If you are using an Azure VM to host your SOLR instance, then you could configure a DNS name for the machine. To do this:

1. Go to VM overview screen
2. Look for 'DNS Name'
3. Click 'Not configured' link
4. Add 'DNS name label'

Your domain will be similar to: intdev-solr.northeurope.cloudapp.azure.com (depending on your data center). You should then be able to generate a self signed certificate in Azure to use for testing purposes.

See here for more info: https://learn.microsoft.com/en-us/azure/virtual-machines/windows/tutorial-secure-web-server