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How Can I Enable SELinux on an ECS Running CentOS? Symptom SELinux is disabled on ECSs running CentOS 7.5 by default. After I enable SELinux by running /etc/selinux/config and enter the login password, the login failed. This section describes how to resolve this issue based on enabled
How Do I View the GPU Usage of a GPU-accelerated ECS? Symptom The GPU usage of GPU-accelerated ECSs running Windows Server 2012 and Windows Server 2016 cannot be viewed in Task Manager. This section provides two methods for you to view the GPU usage. One is to run a command in the
How Can I Install a GUI on an ECS Running Debian? Scenarios To provide a pure system, the ECSs running Debian do not have a GUI installed by default. You can install a GUI on such ECSs as needed. Constraints The operations described in this section apply to ECSs running Debian 8,
How Can I Change the Password for Logging In to a Linux ECS? Solution Use the existing key file to log in to the Linux ECS as user root. Run the following command to reset the password of user root: passwd To reset the password of another user, replace passwd with passwd username.
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 Configure the NTP and DNS Servers for an ECS? For Linux OSs Take the NTP and DNS servers running SUSE as an example. Configure the NTP server for the ECS. Log in to the Linux ECS. Run the following command to switch to user root: sudo su - Run the following command to edit
Why Does a Disk Attached to a Windows ECS Go Offline? Symptom A disk attached to a Windows ECS goes offline, and the system displays the message "The disk is offline because of policy set by an administrator.", as shown in Figure 1. Figure 1 Offline disk Possible Causes Windows has
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
Why Accessing a Website Outside the Chinese Mainland Is Slow on an ECS? Symptom Websites outside the Chinese mainland, including those in Hong Kong (China), Macao (China), Taiwan (China), and other countries and regions, may be slow to access. Generally, an international line is used
Why Does Internet Access to an ECS Deployed with FTP Fail? Symptom You cannot access a Windows ECS with FTP deployed by using an EIP. The FTP client cannot access the FTP server, and the connection times out. It takes a lot of time to upload files. Possible Causes The security group
Migrating an ECS from a Shared Security Group to a Dedicated Security Group Scenarios If instances for different purposes are associated with the same security group, their specific network isolation and security control requirements cannot be met. In addition, the security group
Binding an EIP to the Extended Network Interface of an ECS to Enable Internet Access Scenarios As shown in Figure 1, the ECS has two network interfaces, one primary network interface and one extended network interface. You can bind an EIP to the extended network interface of the ECS
How Can I Back Up an RDS Database to an ECS? You can back up data to an ECS the same way you export SQL statements. The ECS service does not have restrictions on the types of data to be backed up as long as the data complies with local laws and regulations. You can store RDS backup
Binding an EIP to the Extended Network Interface of an ECS to Enable Internet Access Scenarios As shown in Figure 1, the ECS has two network interfaces, one primary network interface and one extended network interface. You can bind an EIP to the extended network interface of the ECS
Why Does My ECS Fail to Obtain an IP Address? Symptom The private IP address of the ECS fails to be obtained. Troubleshooting Locate the fault based on the following procedure. Figure 1 Troubleshooting process Checking Whether DHCP Is Enabled Checking Whether the dhclient Process
How Do I Change the DNS Server Addresses of an ECS? Scenarios This section describes how to change the DNS server addresses of an ECS and make the new DNS server addresses take effect immediately on the ECS. The required operations are as follows: Viewing the DNS Server Addresses
Connecting to a DB Instance from a Linux ECS over a Private Network You can connect to your DB instance using a Linux ECS installed with a PostgreSQL client over a private network. You can use the PostgreSQL client psql to connect to your DB instance over a Secure Sockets Layer (SSL
Connecting to a DB Instance from a Linux ECS over a Public Network You can connect to your DB instance using a Linux ECS installed with a PostgreSQL client over a public network. You can use the PostgreSQL client psql to connect to your DB instance over a Secure Sockets Layer (SSL
