一、linux下查看内存条数及每根内存大小的实现方法
1) 命令如下：
# linux下查看内存条数及每根内存大小的实现方法
dmidecode | grep -A16 "Memory Device$"
root权限下执行之后信息示例：
[root@localhost weblogic]# dmidecode | grep -A16 "Memory Device$"
Memory Device
Array Handle: 0x002B
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM A2
Bank Locator: BANK 0
Type: DDR3
Type Detail: Unbuffered (Unregistered)
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
--
Memory Device
Array Handle: 0x002B
Error Information Handle: No Error
Total Width: 72 bits
Data Width: 64 bits
Size: 8192 MB
Form Factor: DIMM
Set: None
Locator: DIMM A1
Bank Locator: BANK 1
Type: DDR3
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 1600 MHz
Manufacturer: 80CE000080CE
Serial Number: 20685F8E
Asset Tag: 031512
Part Number: M391B1G73QH0-YK0
--
Memory Device
Array Handle: 0x002B
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM B2
Bank Locator: BANK 2
Type: DDR3
Type Detail: Unbuffered (Unregistered)
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
--
Memory Device
Array Handle: 0x002B
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM B1
Bank Locator: BANK 3
Type: DDR3
Type Detail: Unbuffered (Unregistered)
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
2) 命令如下：
# 服务器到底能扩展到多大的内存
dmidecode -t 16root权限下执行之后信息示例：
[root@localhost docker]# dmidecode -t 16
# dmidecode 2.12
SMBIOS 2.7 present.
Handle 0x002B, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Multi-bit ECC
Maximum Capacity: 32 GB
Error Information Handle: No Error
Number Of Devices: 4
二、 查看主板型号
命令如下：
# 查看主板型号
dmidecode |grep -A16 "System Information$"root权限下执行之后信息示例：
[root@localhost docker]# dmidecode |grep -A16 "System Information$"
System Information
Manufacturer: Dell Inc.
Product Name: PowerEdge T110 II
Version: Not Specified
Serial Number: 4856962
UUID: 4C4C4544-0038-3510-8036-B4C04F393632
Wake-up Type: Power Switch
SKU Number: Not Specified
Family: Not Specified
Handle 0x000C, DMI type 2, 9 bytes
Base Board Information
Manufacturer: Dell Inc.
Product Name: 0PC2WT
Version: A06
Serial Number: ..CN7082151S0QIS.
Asset Tag: Not Specified
三、查看服务器上部署的Linux系统与内核信息
1）命令如下：
# lsb_release -a (适用于所有的linux，包括Redhat、SuSE、Debian等发行版，但是在debian下要安装lsb)
lsb_release -aroot权限下执行之后信息示例：
[root@localhost docker]# lsb_release -a
LSB Version: :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID: CentOS
Description: CentOS release 6.9 (Final)
Release: 6.9
Codename: Final
2）命令如下：
# 输入"cat /proc/version",说明正在运行的内核版本
cat /proc/versionroot权限下执行之后信息示例：
[root@localhost docker]# cat /proc/version
Linux version 2.6.32-696.13.2.el6.x86_64 (mockbuild@c1bl.rdu2.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-18) (GCC) ) #1 SMP Thu Oct 5 21:22:16 UTC 2017
3）命令如下：
# 输入"cat /etc/issue", 显示的是发行版本信息
cat /etc/issueroot权限下执行之后信息示例：
[root@localhost docker]# cat /etc/issue
CentOS release 6.9 (Final)
Kernel \r on an \m
4）命令如下：
# 输入"uname -a",可显示电脑以及操作系统的相关信息
uname -aroot权限下执行之后信息示例：
[root@localhost docker]# uname -a
Linux localhost.localdomain 2.6.32-696.13.2.el6.x86_64 #1 SMP Thu Oct 5 21:22:16 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
四、查看服务器上的硬盘大小
命令如下：
# 硬盘大小详情
fdisk -l |grep Disk
root权限下执行之后信息示例：
[root@localhost docker]# fdisk -l |grep Disk
Disk /dev/sda: 500.1 GB, 500107862016 bytes
Disk identifier: 0x769d5702
Disk /dev/mapper/VolGroup-lv_root: 53.7 GB, 53687091200 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/VolGroup-lv_swap: 10.5 GB, 10519314432 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/VolGroup-lv_home: 435.4 GB, 435372949504 bytes
Disk identifier: 0x00000000
五、在Linux服务器中查看CPU
1）命令如下：
# linux CPU大小
cat /proc/cpuinfo |grep "model name" && cat /proc/cpuinfo |grep "physical id"root权限下执行之后信息示例：
[root@localhost docker]# cat /proc/cpuinfo |grep "model name" && cat /proc/cp uinfo |grep "physical id"
model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz
model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz
model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz
model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz
physical id : 0
physical id : 0
physical id : 0
physical id : 0Tips：
Linux下可以在/proc/cpuinfo中看到每个cpu的详细信息。但是对于双核的cpu，在cpuinfo中会看到两个cpu。常常会让人误以为是两个单核的cpu。
其实应该通过Physical Processor ID来区分单核和双核。而Physical Processor ID可以从cpuinfo或者dmesg中找到. flags 如果有 ht 说明支持超线程技术 。
判断物理CPU的个数可以查看physical id 的值，相同则为同一个物理CPU，可以看到上面，这台机器有一个四核的CPU，ID 是0，大小是3.1G。
2）命令如下：
# 查看CPU个数
cat /proc/cpuinfo | grep "physical id" | uniq | wc -lroot权限下执行之后信息示例：
[root@localhost docker]# cat /proc/cpuinfo | grep "physical id" | uniq | wc -l
1
3）命令如下：
# 查看CPU核数
cat /proc/cpuinfo | grep "cpu cores" | uniqroot权限下执行之后信息示例：
[root@localhost docker]# cat /proc/cpuinfo | grep "cpu cores" | uniq
cpu cores : 4
4）命令如下：
# 查看CPU型号
cat /proc/cpuinfo | grep 'model name' |uniqroot权限下执行之后信息示例：
[root@localhost docker]# cat /proc/cpuinfo | grep 'model name' |uniq
model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz
六、怎样查看 linux 的网卡信息
1) 命令如下：
# 查看 linux 的网卡信息
ifconfig执行之后信息示例：
[root@localhost docker]# ifconfig
eth0 Link encap:Ethernet HWaddr F8:DB:88:FE:3A:FA
inet addr:192.168.1.222 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::fadb:88ff:fefe:3afa/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:406668 errors:0 dropped:0 overruns:0 frame:0
TX packets:155262 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:41037516 (39.1 MiB) TX bytes:23813933 (22.7 MiB)
Interrupt:16
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:18475 errors:0 dropped:0 overruns:0 frame:0
TX packets:18475 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1957207 (1.8 MiB) TX bytes:1957207 (1.8 MiB)
2) 命令如下：
# 查看Linux下网卡状态
# ip link 命令 或者 通过mii-tool指令
ip link执行之后信息示例：
[root@localhost docker]# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether f8:db:88:fe:3a:fa brd ff:ff:ff:ff:ff:ff
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