通过ipmitool找回遗忘的iDrac地址

Background：

在使用Dell服务器的过程中，如果发生一下情况：可以进入系统，但是忘记iDrac卡的地址，在系统的某个Linux下，可以使用ipmitool这个工具来get一下硬件的信息，从而也能获得iDrac的地址。

ipmitool是什么：

对于我这类网工来说，百度百科给的解释已经够用了，简单说就是“IPMI（Intelligent Platform Management Interface）即智能平台管理接口是使硬件管理具备“智能化”的新一代通用接口标准。用户可以利用 IPMI 监视服务器的物理特征，如温度、电压、电扇工作状态、电源供应以及机箱入侵等。（来自百度百科的词条解释）”。

在IBM的官网上的一张图片也很有意思：

当然想要使用ipmi的话，需要先安装，默认的许多Linux是没有的，具体版本记不清了，Ubuntu和CentOS都是默认不带的。Ubuntu安装的方法如下，其实一个apt-get就搞定了，出那么一大坨东西，其实就是让你选个Y，然后就装好了。

root@cn-pek1-ubuntu-:~# ipmitool lan print
The program 'ipmitool' is currently not installed. You can install it by typing:
apt-get install ipmitool
root@cn-pek1-ubuntu-:~# apt-get install ipmitool
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  libopenipmi0 libperl5. libsensors4 libsnmp-base libsnmp30 openipmi
Suggested packages:
  lm-sensors snmp-mibs-downloader
The following NEW packages will be installed:
  ipmitool libopenipmi0 libperl5. libsensors4 libsnmp-base libsnmp30 openipmi
 upgraded,  newly installed,  to remove and  not upgraded.
Need to get , kB of archives.
After this operation, , kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get: http://us.archive.ubuntu.com/ubuntu/ trusty/main libsensors4 i386 1:3.3.4-2ubuntu1 [26.1 kB]
Get: http://us.archive.ubuntu.com/ubuntu/ trusty/main libperl5.18 i386 5.18.2-2ubuntu1 [624 kB]
Get: http://us.archive.ubuntu.com/ubuntu/ trusty/main libsnmp-base all 5.7.2~dfsg-8.1ubuntu3 [203 kB]
Get: http://us.archive.ubuntu.com/ubuntu/ trusty/main libsnmp30 i386 5.7.2~dfsg-8.1ubuntu3 [735 kB]
Get: http://us.archive.ubuntu.com/ubuntu/ trusty-updates/universe ipmitool i386 1.8.13-1ubuntu0.1 [325 kB]
Get: http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main libopenipmi0 i386 2.0.18-0ubuntu7.1 [425 kB]
Get: http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main openipmi i386 2.0.18-0ubuntu7.1 [121 kB]
Fetched , kB in 20s ( kB/s)
Selecting previously unselected package libsensors4:i386.
(Reading database ...  files and directories currently installed.)
Preparing to unpack .../libsensors4_1%3a3.3.4-2ubuntu1_i386.deb ...
Unpacking libsensors4:i386 (:3.3.-2ubuntu1) ...
Selecting previously unselected package libperl5..
Preparing to unpack .../libperl5.18_5.18.2-2ubuntu1_i386.deb ...
Unpacking libperl5. (5.18.-2ubuntu1) ...
Selecting previously unselected package libsnmp-base.
Preparing to unpack .../libsnmp-base_5.7.2~dfsg-.1ubuntu3_all.deb ...
Unpacking libsnmp-base (5.7.~dfsg-.1ubuntu3) ...
Selecting previously unselected package libsnmp30:i386.
Preparing to unpack .../libsnmp30_5.7.2~dfsg-.1ubuntu3_i386.deb ...
Unpacking libsnmp30:i386 (5.7.~dfsg-.1ubuntu3) ...
Selecting previously unselected package ipmitool.
Preparing to unpack .../ipmitool_1.8.13-1ubuntu0.1_i386.deb ...
Unpacking ipmitool (1.8.-1ubuntu0.) ...
Selecting previously unselected package libopenipmi0.
Preparing to unpack .../libopenipmi0_2.0.18-0ubuntu7.1_i386.deb ...
Unpacking libopenipmi0 (2.0.-0ubuntu7.) ...
Selecting previously unselected package openipmi.
Preparing to unpack .../openipmi_2.0.18-0ubuntu7.1_i386.deb ...
Unpacking openipmi (2.0.-0ubuntu7.) ...
Processing triggers for man-db (2.6.7.1-) ...
Processing triggers for ureadahead (0.100.-) ...
ureadahead will be reprofiled on next reboot
Setting up libsensors4:i386 (:3.3.-2ubuntu1) ...
Setting up libperl5. (5.18.-2ubuntu1) ...
Setting up libsnmp-base (5.7.~dfsg-.1ubuntu3) ...
Setting up libsnmp30:i386 (5.7.~dfsg-.1ubuntu3) ...
Setting up ipmitool (1.8.-1ubuntu0.) ...
 * Starting IPMI event daemon
Could not open device at /dev/ipmi0 or /dev/ipmi/ or /dev/ipmidev/: No such file or directory
Could not open device at /dev/ipmi0 or /dev/ipmi/ or /dev/ipmidev/: No such file or directory
Could not set IPMB address: Bad file descriptor
ipmievd: using pidfile /var/run/ipmievd.pid0
Could not open device at /dev/ipmi0 or /dev/ipmi/ or /dev/ipmidev/: No such file or directory
Unable to open interface
   ...fail!
invoke-rc.d: initscript ipmievd, action "start" failed.
Unable to start ipmievd during installation.  Trying to disable.
Setting up libopenipmi0 (2.0.-0ubuntu7.) ...
Setting up openipmi (2.0.-0ubuntu7.) ...
Processing triggers for libc-bin (2.19-0ubuntu6) ...
Processing triggers for ureadahead (0.100.-) ...
root@cn-pek1-ubuntu-:~# 

安装好了之后，还有一步要做的就是载入支持 ipmi 功能的系统模块，这个步骤在IBM那个页面上也提到了，我自己的简单的理解就是安装驱动，也许这么理解是不对的

root@linux:~ # modprobe ipmi_msghandler
root@linux:~ # modprobe ipmi_devintf
root@linux:~ # modprobe ipmi_si

用这三条命令，就可以完成了，下面IPMI就可以使用了。

下面这个ipmitool lan print是一条显示lan的相关信息的命令，这里头就可以看到iDrac的地址了。

root@cn-pek1-ubuntu-:~# ipmitool lan print
Set in Progress         : Set Complete
Auth Type Support       : NONE MD2 MD5 PASSWORD
Auth Type Enable        : Callback : MD2 MD5
                        : User     : MD2 MD5
                        : Operator : MD2 MD5
                        : Admin    : MD2 MD5
                        : OEM      :
IP Address Source       : Static Address
IP Address              : 10.19.90.97
Subnet Mask             : 255.255.255.0
MAC Address             : f0:1f:af:ec:0e:
SNMP Community String   : public
IP Header               : TTL=0x40 Flags=0x40 Precedence=0x00 TOS=0x10
BMC ARP Control         : ARP Responses Enabled, Gratuitous ARP Disabled
Gratituous ARP Intrvl   : 2.0 seconds
Default Gateway IP      : 10.19.90.1
Default Gateway MAC     : :::::
Backup Gateway IP       : 0.0.0.0
Backup Gateway MAC      : :::::
.1q VLAN ID          : Disabled
.1q VLAN Priority    :
RMCP+ Cipher Suites     : ,,,,,,,,,,,,,,
Cipher Suite Priv Max   : Xaaaaaaaaaaaaaa
                        :     X=Cipher Suite Unused
                        :     c=CALLBACK
                        :     u=USER
                        :     o=OPERATOR
                        :     a=ADMIN
                        :     O=OEM
root@cn-pek1-ubuntu-:~# 

当然IPMI的功能不仅限于此，还有N多命令可以拿来好好耍耍。