As a general rule, prior to upgrading your DualShield servers you should back up your DualShield server files and database. If your DualShield server machine is a virtual machine then you can simply take a snapshot. If your DualShield server is connecting to an external SQL database server then you must also back up the database separately. 

Single Server System

If you have a single DualShield 5 backend server or all-in-one server, follow the guide below to upgrade it to DualShield 6

Upgrade a DualShield 5 backend server

Multiple Server System

If your DualShield system consists of multiple DualShield servers in a high availability cluster, then you must follow the process below to upgrade the system.

Typically, you would have two DualShield servers set up as a MySQL Dual-Master or MS-SQL Merge-Replication cluster. For the description purpose, let us call them Master/Publisher and Slave/Subscriber.

Step 1: Check all SQL servers in the cluster, make sure they are in sync. See: 

Step 2: Upgrade the Master/Publisher server first (VERY IMPORTANT for MS-SQL Merge Replication. Do NOT upgrade the Subscriber/Slave server first)

Step 3: Wait for the Master/Publisher server to complete the upgrade process. See: 

Step 4: Check both the Master/Publisher and Slave/Subscriber SQL server in the cluster again, make sure that they are in sync.

Step 5: Upgrade the Slave/Subscriber server


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