Using Ipmitool to implement IPMI management of servers in Linux systems

http://www.ibm.com/developerworks/cn/linux/l-ipmi/

1. Brief introduction

IPMI (Intelligent Platform Management Interface), the Intelligent Platform management interface, is the next-generation common interface standard that makes hardware management "intelligent". IPMI monitors the physical characteristics of the server, such as temperature, voltage, fan operating status, power supply, and chassis intrusion. The biggest advantage of IPMI is that it is independent of the CPU BIOS and OS, so the user can monitor the server as soon as it is powered on or off. IPMI is a standard, the most important physical part of which is the BMC (baseboard Management Controller 1), an embedded management microcontroller, which corresponds to the entire platform-managed "brain", through which IPMI You can monitor data for individual sensors and log logs of various events.

Figure 1

Ipmitool is an IPMI platform management tool that can be used as a command line in a Linux system that supports the IPMI 1.5 specification (the latest specification is IPMI 2.0), which enables the acquisition of sensor information, the display of system log content, and network remote switching machines. There are two ways to use Ipmitool (table 1)

Table 1

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2. Prerequisites for using IPMI

To achieve IPMI management of the server, you must meet the following aspects: hardware, OS, management tools, etc.

2.1 The server hardware itself provides support for IPMI

Currently, most vendors such as HP, Dell, and NEC support IPMI 1.5, but not all servers are supported, so you should first determine whether the server supports IPMI through the product manual or in the BIOS, which means that the server has embedded management microcontrollers such as the BMC on the motherboard.

2.2 Operating system provides the appropriate IPMI driver

The system kernel provides support for monitoring the IPMI information of the server itself through the operating system, and the Linux system provides an IPMI-based system interface through kernel-to-OPENIPMI (IPMI driver) support.

2.3 IPMI Management Tools

This article selects the IPMI Platform Administration tool Ipmitool under Linux for command line mode.

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3. Implementing IPMI Management for Linux servers

There are two ways to implement IPMI management of a server with Ipmitool: ① monitors the local server through the OS, and ② monitors the remote server over the network. In this paper, we give an example of using IPMI to obtain CPU temperature and remote control power supply for the two kinds of monitoring methods respectively.

3.1 Implementing the management of the local server 3.1.1 system structure (2) Figure 2

Features (e.g. Table 2)

Table 23.1.2 Configuring the local operating system to support IPMI

The OS Redhat 9.0 used in this article already provides support for IPMI in the kernel, just complete the following steps:

① loading of IPMI-enabled system modules

Note: The module must be loaded before the kernel can identify the Ipmidev device in the ②

② Create a character device node so that Ipmitool can access the IPMI system interface through the driver

3.1.3 Installing Ipmitool to get CPU temperature information

① execute the following command sequentially to install the Ipmitool

② getting CPU temperature with ipmitool command

3.2 Implementing the management of the remote server 3.2.1 system structure (3) Figure 3

Features (e.g. Table 3)

Table 33.2.2 on the monitored server, the IP address is written to the BMC Chip

The remote monitoring of IPMI is achieved by sending UDP packets to the network interface (1:②) connected to the BMC, where the UDP packet is positioned by writing the IP address to the BMC chip, which needs to be done through the local IPMI system interface. Implement the local IPMI system interface and install the Ipmitool management tool on the server side first through the steps of 3.1.2 and section 3.1.3.

Configure the IPMI network Interface (ipmi-over-lan) of the monitored server with the bmcautoconf.sh script (default installation location/usr/local/bin/) included with ipmitool-1.5.9.tar.gz, and write information such as IP address to BMC, the process is as follows:

① using Ipmitool to determine the server's LAN channel

From the results you can see "channel Medium type:802.3 LAN", Channel 7 is LAN channel

Note: The Channel 7 for the Intel SHASTA SPSH4 server is corresponding to the eth0 NIC, so you must select the Eth0 (100M network connection) for IPMI management.

② Modifying the bmcautoconf.sh script based on the identified LAN channel number and network card

Note: The above changes are based on the LAN channel identified in ①, the corresponding NIC, and the specific installation location of the Ipmitool.

③ runs bmcautoconf.sh, writes IP and other information to the BMC

④ determine the results of bmcautoconf.sh

⑤ Setting the network access password

Note: After completing the above steps, the IPMI system interface is no longer required on the monitored server, you can uninstall the modules in section 3.1, 2, or even reinstall a new, IPMI-enabled operating system.

3.2.3 Monitors client Installation Ipmitool and remotely operates server power

① execute the following command sequentially to install the Ipmitool

② remote control of server power via Ipmitool command

Note: Through the Ipmitool can also monitor the fan, chassis and many other related information, the specific use of the way see Ipmitool manpage

Resources

• Ipmitool Manpage, http://ipmitool.sourceforge.net/manpage.html
• OpenIPMI Help, http://openipmi.sourceforge.net/

Using Ipmitool to implement IPMI management of servers in Linux systems