Adding and modifying configuration flags for your YB-Master and YB-TServer nodes in a YugabyteDB universe allows you to resolve issues, improve performance, and customize functionality. If your universe includes a read replica cluster, you can also add or modify configuration flags for the YB-TServer nodes in the read replica cluster.

For more information about the available configuration flags, see the following:

• YB-TServer configuration reference
• YB-Master configuration reference

Modify configuration flags

You can add and edit configuration flags by opening the universe in the YugabyteDB Anywhere UI and clicking Actions > Edit Flags to open the G-Flags dialog shown in the following illustration:

To customize flags of the read replica of a universe that has a read replica cluster, deselect the Apply the same Flags to primary cluster and Read Replica option. (This option is only available for universes with a read replica.) This displays the Read Replica tab. Add and modify flags as you would for the primary cluster. Note that read replicas only have YB-TServers.

Depending on the flag, the universe may need to be restarted to apply the changes. You can apply changes as follows:

• Immediately using a rolling restart.
• Immediately using a concurrent restart.
• Immediately apply any changes that do not require a restart and wait until the next time the universe is restarted to apply the remaining changes.

Add flags

Click Add Flags > Add to Master to open the Add to Master dialog, then select the flag you want to add to YB-Master and set its value, as per the following illustration:

Click Add Flags > Add to T-Server to open the Add to T-Server dialog, then select the flag you want to add to YB-TServer and set its value.

Use Add as JSON > Add to Master and Add as JSON > Add to T-Server to import flags in bulk. The flags must be defined as key-value pairs in a JSON format via the in the Add to T-Server or Add to Master dialog, as per the following illustration:

Edit flags

To edit a flag:

1. Find the flag you want to change in the FLAG NAME column.

2. Click the Edit Flag icon for either MASTER VALUE or T-SERVER VALUE to open the Edit Flag Value dialog, as per the following illustration:

   

3. Change the value in the Flag Value field and then click Confirm.

To delete the flag's value, click the Remove Flag icon for either MASTER VALUE or T-SERVER VALUE or both.

Add configuration flags

You can add configuration flags when you are creating a new universe, as follows:

• Navigate to either Dashboard or Universes and click Create Universe.
• Complete the required sections of the Create Universe page.
• When you reach G-Flags, perform steps described in Modify configuration flags.