Setting the urlScheme to https

Configure your Solr cluster properties in ZooKeeper, so that Solr nodes know to communicate via SSL.

1. Stop the Solr service on all nodes:
   For Ubuntu:

   systemctl stop solr

   For RHEL:

   service solr stop

2. Connect to one of the Solr nodes and change to the root user, if this is not already the case:

   sudo su -

3. Add the missing executable flag to the zkcli script:

   chmod +x /opt/solr/server/scripts/cloud-scripts/zkcli.sh

4. Become Solr user and set the HTTPS url scheme:

   sudo su - solr
   /opt/solr/server/scripts/cloud-scripts/zkcli.sh -zkhost \
   server1:2181,server2:2181,server3:2181 \ 
   -cmd clusterprop -name urlScheme -val https

   Note: If there are existing Solr collections prior to enabling SSL, use the following command to update the cluster properties to use HTTPS (update the hostname and port as appropriate for your system):

   http://<hostname>:<port>/solr/admin/collections?action=CLUSTERPROP&name=urlScheme&val=https

   The following message should be displayed:

   INFO  - xxxx-xx-xx xx:xx:xx.xxx; org.apache.solr.common.cloud.ConnectionManager; zkClient has connected

5. Press Ctrl+D or enter exit to go back to the root user.
6. Start the Solr service on all nodes:
   For Ubuntu:

   systemctl start solr

   For RHEL:

   service solr start