对于linux的网卡上下行流量监测方法有很多
例如nload

现成的nload命令

现成的有 nload
安装
yum -y install nload

查看所有网卡实时网速

sudo nload -m

按enter/上下翻页键即可切换网卡

查看指定网卡实时网速

sudo nload eth0 -m

基于nettraf编译的rpm包

当然也可以你们自己编译安装，为了省事，直接编译成rpm包便于分发给centos系列系统使用

[root@Aliyun-HK ~]# yum -y install lrzsz
//上传nettraf的rpm包 ....
//安装
yum -y install nettraf-master-1.el7.x86_64.rpm
//卸载
yum -y remove nettraf

使用命令
nettraf 网卡名

+-----------------------+-----------------------+
|         eth0          |         eth1          |
|      TX         RX    |      TX         RX    |
|  PPS   BPS   PPS   BPS|  PPS   BPS   PPS   BPS|
+-----------------------+-----------------------+
|   7K   79M    3K    4M|   3K   13M   11K  107M|
|   4K   35M    2K    3M|   6K    7M   35K  418M|
|  32K  373M    6K    6M|   4K   13M   15K  171M|
|   8K   81M    4K    4M|   5K    6M   26K  305M|
|   8K   73M    4K    4M|   7K   10M   35K  410M|
|   6K   52M    4K    4M|   3K    7M   12K  130M|
|  10K  102M    4K    4M|   5K    7M   22K  255M|
|   6K   55M    3K    3M|   3K    6M    7K   76M|
|   7K   59M    5K    5M|   5K    9M   24K  277M|
|   6K   59M    3K    3M|   3K    6M   16K  184M|
|   5K   36M    3K    3M|   2K    4M    4K   35M|
|   8K   87M    3K    3M|   4K    6M   23K  276M|
|   5K   41M    4K    5M|  21K  170M   37K  312M|
|   4K   36M    3K    4M|   3K    6M    8K   88M|
|   5K   38M    3K    3M|   5K    7M   22K  259M|
|  11K  107M    7K   30M|   7K   29M   22K  233M|
|  10K  100M    4K    4M|   2K    6M    7K   79M|
|   8K   79M    5K    4M|   7K   40M   21K  216M|

使用方法
下载rpm软件包，上传到Centos操作系统中 yum -y install nettraf-master-1.el7.x86_64.rpm
即可使用

[root@ali-hk x86_64]# yum -y install nettraf-master-1.el7.x86_64.rpm
Loaded plugins: fastestmirror, getpagespeed
Examining nettraf-master-1.el7.x86_64.rpm: nettraf-master-1.el7.x86_64
Marking nettraf-master-1.el7.x86_64.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package nettraf.x86_64 0:master-1.el7 will be installed
--> Finished Dependency ResolutionDependencies Resolved==================================================================================================Package         Arch           Version                Repository                            Size
==================================================================================================
Installing:nettraf         x86_64         master-1.el7           /nettraf-master-1.el7.x86_64         0.0  Transaction Summary
==================================================================================================
Install  1 PackageInstalled size: 0  
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transactionInstalling : nettraf-master-1.el7.x86_64                                                    1/1 Verifying  : nettraf-master-1.el7.x86_64                                                    1/1 Installed:nettraf.x86_64 0:master-1.el7                                                                   Complete!