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How Do I Change the CIDR Block of an ECS Subnet? Scenarios You want to change the CIDR block of an ECS subnet. After you create a subnet, you cannot directly change its CIDR block. To change a CIDR block, you need to change the subnet. Prerequisites The ECS has been stopped. Procedure
How Can I Obtain the MAC Address of My ECS? This section describes how to obtain the MAC address of an ECS. The MAC address of an ECS cannot be changed. Linux (CentOS 6) Log in to the Linux ECS. Run the following command to view the MAC address of the ECS: ifconfig Figure 1 Obtaining
Why Does My Linux ECS Fail to Access the Internet? Symptom Your attempt to access the Internet from your Linux ECS failed. Fault Locating The following fault causes are sequenced based on their occurrence probability. If the fault persists after you have ruled out a cause, check other
How Can I Stop an ECS from Being Billed? After a pay-per-use or spot ECS is stopped (excluding bare metal ECSs or ECSs with local disks or FPGAs attached), its basic resources (vCPUs, memory, image, and GPUs) will no longer be billed, but its associated resources such as EVS disks
How Can I Automatically Renew a Yearly/Monthly ECS? Solution Select Auto renew when purchasing a yearly/monthly ECS. On the Buy ECS page, select Auto renew under Required Duration. Figure 1 Auto renew Select the EIP bound to the target ECS for automatic renewal. Auto renew is provided
Why Is the ECS IP Address Lost After the System Time Changes? Symptom After the system time changes, an exclamation mark (!) is displayed for the NIC, and the ECS cannot connect to the Internet. Scenarios The operations described in this section apply to ECSs running CentOS 7 or EulerOS
What OSs Are Supported If I Want to Install Docker on a Linux ECS? If you want to install Docker on your Linux ECS, ensure that the OS of your ECS is supported by Docker. Table 1 lists the OSs supported by Docker. Table 1 OSs supported by Docker OS Version Location CentOS CentOS 7
Why Is the IP Address Lost After the System Time of an ECS Is Modified? Symptom After the system time of an ECS is modified, its IP address is lost. Possible Cause The time range you modified exceeds the DHCP lease time. The default DHCP lease time set when you create a subnet is
How Do I Troubleshoot an Unresponsive Website Hosted on My ECS? Symptom Websites running on an ECS might become unreachable for multiple reasons. Check whether the configurations of network, port, firewall, or security group of the ECS are correct. Fault Locating If an error is displayed
How Do I Disable Login to an ECS Using SSH Password? Scenarios To ensure ECS security, you need to change the access key of an ECS regularly, or disable the SSH password login. This section describes how to disable the SSH password authentication. After disabling SSH password login
Changing an ECS OS (Using an Image Without Cloud-Init Installed) Function This API is used to change the OS of an ECS. This API is an asynchronous API. After the OS change request is successfully delivered, a job ID is returned. This does not mean the OS change is complete. You need
Reinstalling an ECS OS (Using an Image Without Cloud-Init Installed) Function This API is used to reinstall an ECS OS. This API is an asynchronous API. After the OS reinstallation request is successfully delivered, a job ID is returned. This does not mean the reinstallation is complete
Unbinding a Virtual IP Address from an ECS NIC (Discarded) Function A virtual IP address provides another IP address for one or multiple ECS NICs, improving high availability between the ECSs. This API is used to unbind a virtual IP address from an ECS NIC. After the NIC is unbound
How Do I Troubleshoot an Unresponsive Website Hosted on My ECS? Symptom Websites running on an ECS might become unreachable for multiple reasons. Check whether the configurations of network, port, firewall, or security group of the ECS are correct. Fault Locating If an error is displayed
What Should I Do If Emails Configured on an ECS Cannot Be Sent? Solution For the emails sent using the browser: When you use a browser to log in to your mailbox, HTTP is used, and the default port number is 80. However, SMTP is used between email servers. If you use a browser to send
Why Does Login to My ECS Using the Reset Password Fail? Scenarios You cannot use the new password that you set to log in to the ECS. Ensure that the one-click password reset plug-in is not blocked by security software. Otherwise, the one-click password reset function is unavailable
Resetting the Password for Logging In to a Windows ECS Without the Password Reset Plug-in Installed Scenarios If the password reset plug-in is not installed on a Windows ECS or a password reset does not take effect, you can reset the password following the instructions provided in
Resetting the Password for Logging In to a Linux ECS Without the Password Reset Plug-in Installed Scenarios If the password reset plug-in is not installed on a Linux ECS or a password reset does not take effect, you can reset the password following the instructions provided in this
Can I Select Another OS During ECS OS Reinstallation? No. You can only use the original image of the ECS to reinstall the OS. If you want to use a new OS image, change the OS. For details, see Changing the OS. Parent topic: OS Change
Should I Choose Windows OS or Linux OS for My ECS? Difference Between Windows OS and Linux OS The following table shows the difference between Windows OS and Linux OS. Select an OS based on your service requirements. Table 1 Differences OS Developer Language Database Windows ASP.NET
