What are the limitations of bare-metal servers?
- Direct loading of external hardware devices (such as USB devices, bank U keys, external hard drives, dongles, etc.) is not supported.
- Out-of-band management is not supported. Your bare metal server resources are uniformly managed and maintained by Huawei Cloud.
- It does not support live migration, and the failure of the server will have an impact on the business. It is recommended that you achieve high availability of business through business cluster deployment, primary and backup deployment, etc.
- It is not supported to create a bare device without an operating system, that is, a bare metal server must have its own operating system.
- Replacing the VPC after creation is not supported.
- Secondary virtualization inside the bare metal server is not supported, that is, the installation of virtualization software is not supported.
- It is not supported to customize the configuration of CPU and memory of bare metal server, and it is not supported to expand CPU, memory and local disk. Only cloud hard disk can be expanded.
- Only SCSI type cloud hard disk can be mounted.
- Due to the fact that some models of servers are not equipped with SDI cards, or other servers themselves, bare metal servers with some specifications or images do not support mounting cloud hard drives.
- Do not delete or modify the plug-in services (such as Cloud-Init, bms-network-config, etc.) built in the image, otherwise it will affect your basic function.
- When creating a bare metal server, if you choose automatic IP address allocation, please do not modify the private IP address after the provisioning of the bare metal server, to avoid IP conflicts with other bare metal servers.
- Bare-metal servers do not support the configuration of bridge network cards, which will lead to network congestion.
- It is forbidden to upgrade the OS kernel version, otherwise there will be compatibility risks in the server hardware driver and affect the reliability of the server.
- At present, it only supports shutting down the bare metal server from the management console, and does not support shutting down the bare metal server using the shutdown command inside the individual instance OS.
What are the main differences between bare-metal servers and elastic cloud servers (virtual machines)?
Elastic cloud servers share physical resources among multiple tenants, while bare metal servers share resources exclusively among users. For critical applications or businesses with high performance requirements (such as big data clusters, enterprise middleware systems), and requiring a safe and reliable operating environment, bare-metal servers are recommended.
What is the difference between bare-metal servers and traditional physical machines?
Bare-metal servers enable traditional physical machines to have cloud capabilities such as automatic provisioning, automatic operation and maintenance, and VPC interconnection. It can be distributed and used flexibly like virtual machines, and has excellent computing, storage and network capabilities. Bare metal servers have all the features and advantages of physical machines, and your applications can directly access the processors and memory of bare metal servers without any virtualization overhead.
What are the prerequisites for bare-metal server login?
Windows operating system
Get a login password
Windows operating systems can only select key login when created, and need to parse the key file into a password first.
Make sure the bare metal server is bound to an elastic public IP
Linux operating system
Get a login password
Authentication is SSH key pair: use the key you selected when creating it. If your private key file is lost, it is recommended that you enable the data encryption service and reset the key pair. Refer to link: Reset the key pair
Password authentication: Use the password you set when you created it. If you forget your password, you can reset it. Refer to link: Reset Bare-metal server password
Make sure the bare metal server is bound to an elastic public IP (not required for remote login)
SSH key mode, username and password mode to login to the bare metal server, you need to bind the elastic public IP.
How do two bare metal servers in the same area and different availability zones communicate?
If two bare metal servers in the same region and different availability zones are in the same VPC, the inner network will communicate with each other. The second layer communication will be carried out when the same VPC and the same subnet are used, and the third layer communication will be carried out when the same VPC and different subnets are used. When communicating, both bare metal servers need to be bound to the elastic public network IP and bound to the main network card.
Can I install or upgrade the operating system myself?
Bare-metal servers support reinstallation from existing operating systems, but in case of upgrading scenarios, such as upgrading the kernel or some software installation packages related to network services and hardware drivers, please check with us whether you need to reinstall hardware drivers (such as raid card drivers, network card drivers, etc.) and corresponding service packages. Because the hardware driver and some service packs are strongly related to the kernel version, if the corresponding version of the driver or service pack is not installed, it is likely that the OS will not start up, or the basic functions will not be available.