Overview

Updated on 2024-12-03 GMT+08:00

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If FlexusL instances are not protected, they may be attacked by viruses, resulting in data leakage or data loss. This section describes common measures to improve FlexusL instance security.

Security Protection

FlexusL instances can be protected externally and internally.

**Table 1** Methods for improving FlexusL instance security
Type	Description	Protection Method
External security	DDoS attacks and Trojan horses or other viruses are common external security issues. To address these issues, you can enable Host Security Service (HSS) to protect your FlexusL instances.	Enabling HSS Backing Up Data Periodically
Internal security	Weak passwords and incorrect ports opening may cause internal security issues. Improving the internal security is the key to improving the instance security. If the internal security is not improved, external security solutions cannot effectively intercept and block various external attacks.	Enhancing the Login Password Strength Improving the Port Security Periodically Upgrading the OS

Enabling HSS

HSS is designed to improve the overall security for cloud servers. It helps you identify and manage the assets on your servers, eliminate risks, and defend against intrusions and web page tampering. There are also advanced protection and security operations functions available to help you easily detect and handle threats.

You can enable HSS (basic edition) when purchasing a FlexusL instance. After the purchase, your instance is automatically protected.
You can also enable HSS on the HSS console after the FlexusL instance is purchased.

For details about how to enable HSS, see Configuring HSS for a FlexusL Instance.

Backing Up Data Periodically

CBR enables you to back up FlexusL instances and disks with ease. In case of a virus attack, accidental deletion, or software or hardware fault, you can restore data to any point when the data was backed up. CBR protects your services by ensuring the security and consistency of your data.

You can enable CBR when purchasing a FlexusL instance. After the purchase, CBR automatically backs up the FlexusL instance based on the default backup policy.
You can also enable CBR on the CBR console after the FlexusL instance is purchased.

For details, see Backing Up a FlexusL Instance.

Enhancing the Login Password Strength

To ensure the security of your FlexusL instance, you can set a strong login password by following these guidelines:

Set a password which consists of at least 10 characters.
Do not use easily guessed passwords (for example, passwords in common rainbow tables or passwords with adjacent keyboard characters). The password must contain at least three of the following character types: uppercase letters, lowercase letters, digits, and special characters.
Do not use your username or any part of it, such as administrator, test, root, oracle, and mysql.
Change the password at least every 90 days.
Do not reuse the latest five passwords.
Set different passwords for different applications. Do not use the same password for multiple applications.

Improving the Port Security

A security group is a collection of access control rules for cloud servers in a VPC. You can define access rules for a security group to protect the cloud servers in this group.

You can configure security group rules to control access to or from specific ports. You are advised to disable high-risk ports and only enable necessary ports.

Table 2 lists some high-risk ports. Do not use these ports for your services.

**Table 2** High-risk ports
Protocol	Port
TCP	42 135 137 138 139 444 445 593 1025 1068 1434 3127 3128 3129 3130 4444 4789 5554 5800 5900 9996
UDP	135~139 1026 1027 1028 1068 1433 1434 4789 5554 9996

Periodically Upgrading the OS

After a FlexusL instance is created, you need to maintain and periodically upgrade the OS. Officially released vulnerabilities will be published in Security Notices.

Parent Topic: Managing Server Security

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Next topic: Configuring the Security Group for a FlexusL Instance