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How Can I Allow or Deny Login from Specific Users or IP Addresses to an ECS Using SSH? Scenarios This section describes how to allow or deny specific users or IP addresses to access an ECS using SSH. Constraints DenyHosts has been installed on the ECS. Restarting the sshd service
Why Do the Modifications to /etc/security/limits.conf Not Take Effect After the ECS Restarts? Symptom Modifications to the /etc/security/limits.conf file become invalid after the ECS restarts. Possible Causes In Linux, file /etc/security/limits.conf and directory /etc/security/limits.d
What Can I Do If /etc/resolv.conf Is Restored After an ECS Running Ubuntu Is Restarted? Symptom After an ECS running Ubuntu or network-related services are restarted, the /etc/resolv.conf file is updated, and the nameserver field is restored to 127.0.0.53. Figure 1 Symptom Possible
Do I Need to Configure an EIP in an AS Configuration When a Load Balancer Has Been Enabled for an AS Group? No. If you have enabled a load balancer for an AS group, you do not have to configure an EIP in the AS configuration. The system automatically associates instances in the AS
Why Does My Linux ECS Fail to Access the Internet After Port 80 Is Allowed by the Firewall Rules? Symptom The Linux ECS cannot access the Internet after port 80 is allowed by the firewall rules. After the firewall is disabled, access to the Internet succeeds. Possible Causes The possible
Do I Need to Configure an EIP in an AS Configuration When a Load Balancer Has Been Enabled for an AS Group? No. If you have enabled a load balancer for an AS group, you do not have to configure an EIP in the AS configuration. The system automatically associates instances in the AS
Why Does HTTPS Access Fail When an HTTPS Certificate Has Been Configured for My Domain Name? Check whether the certificate matches your domain name. For example, a single-domain certificate push.yourdomain.com can match only the domain name push.yourdomain.com. A wildcard-domain certificate
Why Is the EVS Disk Size Not Updated in the BMS OS After the EVS Disk Capacity Has Been Expanded? If this occurs, scan block devices in the BMS OS. Take the sdh disk of Red Hat as an example, run the echo 1 > /sys/block/sdh/device/rescan command. Parent topic: Disk FAQ
Do I Need to Install IPsec Software on Each Server That Needs to Access an ECS to Establish a VPN Connection? No. VPN connects two LANs. Multiple servers in the on-premises data center use the same public IP address to access the cloud. If you install IPsec software on the on-premises
How Do I Check Whether a Back-to-Origin IP Address Has Been Whitelisted on My Origin Server? Check servers and security devices to ensure that they have whitelisted the back-to-origin IP addresses and will not limit or block access traffic. For example: If your origin servers are
How Do I Handle the Startup Failure of a Windows ECS Created from a Windows Image Generalized by Sysprep? Symptom When you start the ECS, information similar to the following is displayed. Figure 1 Message displayed Then, the following information is displayed in the dialog box: Windows
What Do I Do If a Partition Is Not Found During the Startup of an ECS Created from an Imported Private Image? Cause Disk partition IDs are changed after the cross-platform image import. As a result, no partition can be found at startup. In this case, you need to change disk partition
Can I Use the System Disk Image of an ECS on a BMS After I Export It from the Cloud Platform? No. The system disk image of an ECS is a VM file that contains a system running environment and does not have an installation boot program. So, it cannot be used on a BMS. For how to create
Can I Continue to Use the Remaining Quota of a Free Package Next Month If It Has Not Been Used Up? Currently, the quotas of free packages within a given validity period can be combined. As long as a package has not expired, you can continue to use its remaining quota the following
What Should I Do If an ECS Cannot Connect to an RDS for SQL Server Instance Through a Private Network? Perform the following steps to identify the problem: Check whether the ECS and RDS for SQL Server instance are located in the same VPC. If they are in the same VPC, go to 2. If they
Will My Access Be Restricted by Bandwidth When I Connect to My Instance from an ECS over a Private Network? No. Parent Topic: Database Connection
What Should I Do If an ECS and RDS Instance Deployed in Different VPCs Cannot Communicate with Each Other? Change the VPC hosting the ECS to the same as that hosting the RDS. Create a VPC peering connection. Parent Topic: Database Connection
What Can I Do If the Data Migration Fails Because the DLI Throttling Threshold Has Been Reached? Symptom A big data migration task failed, and the error message "The throttling threshold has been reached" was displayed for the Spark job on DLI. Possible Causes The number of created
What Should I Do If "The API does not exist or has not been published in the environment." Is Displayed? If an open API of a cloud service failed to be called, troubleshoot the failure by performing the following operations: The domain name, request method, or path used for calling
Why Does the System Display a Message Indicating Invalid Credentials When I Attempt to Access a Windows ECS? Symptom When you use a local PC running Windows to access a Windows ECS using RDP (for example, MSTSC), the system displays a message indicating that the credentials are invalid
