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How Can I Enable Virtual Memory on a Windows ECS? Enabling ECS virtual memory will deteriorate I/O performance. If the ECS memory is insufficient, increase the memory by performing the operations in Modifying Individual ECS Specifications. If you really need to enable virtual memory
How Can I Reset the Password for Logging In to an ECS in the OS? Scenarios This section describes how to reset the password for logging in to an ECS in the OS when the password is about to expire, the password is forgotten, or you are logging in to the ECS for the first time. It is
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
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 login. After disabling SSH password login, you can
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 Causes The time range you modified exceeds the DHCP lease time. The default DHCP lease time set when you create a VPC subnet
How Can I Obtain the Permission to Remotely Log In to a Windows ECS? Symptom When you connect a remote desktop to a Windows ECS, the system prompts that you need to be granted the right to sign in through Remote Desktop Services. Figure 1 Remote login right missing. Solution Open
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
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
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
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
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
What Should I Do If the ECS Resources to Be Purchased Are Sold Out? When you are purchasing ECSs, the selected specifications may be sold out. In this case, the specifications cannot be purchased in the current region or AZ. Instance specifications vary in different regions and AZs
How Can I Obtain the Permission to Remotely Log In to a Windows ECS? Symptom When you connect a remote desktop to a Windows ECS, the system prompts that you need to be granted the right to sign in through Remote Desktop Services. Figure 1 Remote login right missing. Solution Open
How Can I Recover a Windows ECS with an Abnormal Virtualization Driver? Background An error occurs in the virtualization driver on a Windows ECS because of improper running of Tools. To ensure proper ECS running, handle this issue by following the instructions provided in this section
How Can I Install a GUI on an ECS Running CentOS 6? Scenarios To provide a pure system, the ECSs running CentOS 6 do not have a GUI installed by default. You can install a GUI on such ECSs as needed. Constraints Before installing a GUI on an ECS, ensure that the idle memory is greater
How Can I Install a GUI on an ECS Running CentOS 7? Scenarios You want to install a GUI on an ECS running CentOS 7 series. Constraints Before installing a GUI on an ECS, ensure that the idle memory is greater than or equal to 2 GB. Otherwise, the GUI installation may fail or the ECS
Why Do I Fail to Connect to a Linux ECS Using WinSCP? Symptom Connecting to a Linux ECS using WinSCP fails, while using SSH tools like Xshell succeeds. Figure 1 Connection error using WinSCP Root Cause If you can connect to a Linux ECS using SSH tools, the SSH tools run properly.
