When you choose to encrypt the PKCS#11 PIN(s) using a custom password, on starting or restarting the external-indexer service, you are asked to enter your password using a special tool.
To provide your password using the required tool
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Start the external-indexer service: systemctl start external-indexer 
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The external-indexer service prompts you to provide a password using the systemd-ask-password tool. Issue: systemd-tty-ask-password-agent 
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Provide the password at the prompt. You can use multiple agents to enter the password. 
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Once the external indexer(s) have been started or restarted, make sure that all the indexers have started up successfully. For example, on CentOS 7, you can use: systemctl status external-indexer 
