代码如下：

#!/bin/sh
# filename softirqs_status.sh

PATH=/bin:/sbin:/usr/bin:/usr/sbin
export PATH

interrupts_=cat /proc/interrupts |grep -E "CPU0|em[0-9]{1,2}.*-[0-9]{1,3}$|eth[0-9]{1,2}.*-[0-9]{1,3}$|p[0-9]{1,2}p[0-9]{1,2}.*-[0-9]{1,3}$|nvme" |cat -s |column -t 
#interrupts_=cat /proc/interrupts |grep -E "CPU0|em[0-9]{1,2}.*-[0-9]{1,3}$|eth[0-9]{1,2}.*-[0-9]{1,3}$|p[0-9]{1,2}p[0-9]{1,2}.*-[0-9]{1,3}$" |cat -s |column -t 
#interrupts_=cat /proc/interrupts |grep -E "CPU0|em[0-9]{1,2}|eth[0-9]{1,2}|p[0-9]{1,2}p[0-9]{1,2}" |grep -i  "TxRx" |cat -s |column -t 
interrupts_=echo "${interrupts_}" |awk '{ if(NR == 1){one=$0;gsub(one, "- &", $0); print $0}else{print $0}}' |cat -s |column -t 
interrupts_=echo "${interrupts_}" |awk '{ for(i=2;i<=NF;i++){ if( $i ~ /^[[:digit:]]*$/ && $i >= 1000 && $i < 1000000 ){$i=int( $i / 1000 + 1)"K"}else if( $i ~ /^[[:digit:]]*$/ && $i >= 1000000 ){$i=int( $i / 1000000)"M"}}; print $0 }'
echo "${interrupts_}" |sed 's/CPU/U/g' |column -t

echo

cpu_c=expr $(cat /proc/cpuinfo |grep -i processor |wc -l) + 1 ;

softirqs_=cat /proc/softirqs |grep -E 'TX|RX|CPU' 
softirqs_=echo "${softirqs_}" |awk -v cpu_c=$cpu_c '{ if(NR == 1){one=$0;gsub(one, "- &", $0)}; for(i=1;i<=cpu_c;i++){print $i} }' 
softirqs_=echo "${softirqs_}" |xargs -n $cpu_c |column -t 
softirqs_=echo "${softirqs_}" |awk '{ for(i=2;i<=NF;i++){ if( $i ~ /^[[:digit:]]*$/ && $i >= 1000 && $i < 1000000 ){$i=int( $i / 1000 + 1)"K"}else if( $i ~ /^[[:digit:]]*$/ && $i >= 1000000 ){$i=int( $i / 1000000)"M"}}; print $0 }'
echo "${softirqs_}" |sed 's/CPU/U/g' |column -t

echo

显示结果如下

 bash /tmp/softirqs_status.sh
-    U0   U1  U2  U3  U4  U5  U6  U7  U8  U9  U10  U11  U12  U13  U14  U15  U16  U17  U18  U19  U20  U21  U22  U23  U24  U25  U26  U27  U28  U29  U30  U31
89:  102  0   0   0   0   0   0   0   0   0   0    0    0    0    0    0    0    0    0    0    0    0    0    4M   0    0    0    0    0    0    0    0    IR-PCI-MSI-edge  em49-fp-0
90:  4K   0   0   0   6M  0   0   0   0   0   0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    IR-PCI-MSI-edge  em49-fp-1
91:  50   5M  0   0   0   0   0   0   0   0   0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    IR-PCI-MSI-edge  em49-fp-2
92:  51   0   7M  0   0   0   0   0   0   0   0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    IR-PCI-MSI-edge  em49-fp-3
93:  64   0   0   6M  0   0   0   0   0   0   0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    IR-PCI-MSI-edge  em49-fp-4
94:  32   0   0   0   3K  0   0   0   0   0   0    0    0    0    0    0    0    5M   0    0    0    0    0    0    0    0    0    0    0    0    0    0    IR-PCI-MSI-edge  em49-fp-5
95:  41   0   0   0   0   6M  0   0   0   0   0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    IR-PCI-MSI-edge  em49-fp-6
96:  53   0   0   0   0   0   6M  0   0   0   0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    IR-PCI-MSI-edge  em49-fp-7

-        U0  U1  U2   U3   U4  U5   U6   U7   U8   U9   U10  U11  U12  U13  U14  U15  U16  U17  U18  U19  U20  U21  U22  U23  U24  U25  U26  U27  U28  U29  U30  U31
NET_TX:  35  26  667  114  93  160  106  1    0    0    0    0    0    0    0    0    1    2K   0    2    0    0    0    51   0    0    0    0    0    0    0    0
NET_RX:  5K  5M  7M   6M   6M  6M   6M   707  720  462  542  507  541  866  392  332  127  5M   289  199  251  244  194  4M   204  3K   396  446  217  165  164  128

查看网卡速率

ethtool eth0 |grep Speed

这里的Speed是网卡的实际最大速率；如果开启了自动协商，就是是网卡和交换机协商之后的速率。

附带一个自动化脚本

PREFIX="p1p1"
ETH=ifconfig |grep ${PREFIX} | head -n1 | awk -F":" '{print $1;}'

if [ -z "${ETH}" ];then
   echo "emxx is not found"
   ifconfig
   exit 1
fi

ethtool eth0 |grep Speed

查看内存信息

• 支持的内存槽数
• 支持的最大内存

sudo dmidecode -t memory

输出如下：

# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.8 present.

Handle 0x0028, DMI type 16, 23 bytes
Physical Memory Array
        Location: System Board Or Motherboard
        Use: System Memory
        Error Correction Type: None
        Maximum Capacity: 8 GB
        Error Information Handle: Not Provided
        Number Of Devices: 2

Handle 0x002A, DMI type 17, 40 bytes
Memory Device
        Array Handle: 0x0028
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 4 GB
        Form Factor: DIMM
        Set: None
        Locator: A1_DIMM0
        Bank Locator: A1_BANK0
        Type: DDR3
        Type Detail: Unknown
        Speed: 1600 MT/s
        Manufacturer: Samsung
        Serial Number: 37A52995
        Asset Tag: A1_AssetTagNum0
        Part Number: M471B5173DB0-YK0
        Rank: 1
        Configured Memory Speed: 1333 MT/s
        Minimum Voltage: 1.35 V
        Maximum Voltage: 1.5 V
        Configured Voltage: 1.35 V

Handle 0x002C, DMI type 17, 40 bytes
Memory Device
        Array Handle: 0x0028
        Error Information Handle: Not Provided
        Total Width: Unknown
        Data Width: 64 bits
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: A1_DIMM1
        Bank Locator: A1_BANK1
        Type: Unknown
        Type Detail: Unknown
        Speed: Unknown
        Manufacturer: A1_Manufacturer1
        Serial Number: A1_SerNum1
        Asset Tag: A1_AssetTagNum1
        Part Number: Array1_PartNumber1
        Rank: Unknown
        Configured Memory Speed: Unknown
        Minimum Voltage: Unknown
        Maximum Voltage: Unknown
        Configured Voltage: Unknown

EPEL

EPEL的全称叫 Extra Packages for Enterprise Linux 。EPEL是由 Fedora 社区打造，为 RHEL 及衍生发行版如 CentOS、Scientific Linux 等提供高质量软件包的项目。

官方网址为：https://fedoraproject.org/wiki/EPEL

Centos安装命令： sudo yum install epel-release

rpmfusion

RPM Fusion provides software that the Fedora Project or Red Hat doesn’t want to ship. That software is provided as precompiled RPMs for all current Fedora versions and current Red Hat Enterprise Linux or clones versions; you can use the RPM Fusion repositories with tools like yum and PackageKit.

RPM Fusion is a merger of Dribble, Freshrpms, and Livna; our goal is to simplify end-user experience by grouping as much add-on software as possible in a single location. Also see our FoundingPrinciples.

官方网站为 https://rpmfusion.org/

Remi repository

Remi repository 是包含最新版本 PHP、MySQL、Python 包的 Linux 源，由 Remi 提供维护。

官方网站为 http://rpms.remirepo.net/。

Enterprise Linux 7 (with EPEL) x86_64 的安装方法:

wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
wget https://rpms.remirepo.net/enterprise/remi-release-7.rpm
rpm -Uvh remi-release-7.rpm epel-release-latest-7.noarch.rpm

如何要安装php的7.4版本则执行下面的命令：

yum -y --nogpgcheck install epel-release \
&& yum -y --nogpgcheck install https://rpms.remirepo.net/enterprise/remi-release-7.rpm \
&& yum -y --nogpgcheck install yum-utils \
&& yum-config-manager --enable remi-php74 \
&& yum -y --nogpgcheck install yum install nginx php  php-cli php-fpm php-mysqlnd php-zip php-devel php-gd php-mcrypt php-mbstring php-curl php-xml php-pear php-bcmath php-json

WANDisco

安装新版本的git 库

# 卸载旧版 git
yum -y remove git

# 安装 centos7 WANDisco 仓库
yum install http://opensource.wandisco.com/centos/7/git/x86_64/wandisco-git-release-7-2.noarch.rpm

yum -y install git

mysql

https://dev.mysql.com/downloads/

常用命令

按使用频度排序

• git pull
• git log
• git diff
• git commit
• git commit –amend
• git review
• git clone
• git push
• git reset –hard/soft
• git checkout
• git fetch –all
• git merge
• git branch -b develop origin/develop
• git clean -df

git 命令非常多，但常用的只有以上几个

常用配置

用户名和密码

$ git config --global user.name liuzuocheng

$ git config --global user.email zuocheng.liu@gmail.com

权限验证

在git pull/push/clone 时输入密码会比较麻烦。在所有的解决方法中，除了使用密钥之外，还可以使用.git-credentials配置文件。这种方法的坏处则是密码用明文存储，安全风险大。

touch ${HOME}/.git-credentials
输入内容
https://username:password@gitlab.zuocheng.net
执行下面命令使其生效
git config --global credential.helper store

默认编辑器

$ git config --global core.editor vim

配置比较工具

git config --global merge.tool vimdiff

git config --global diff.tool vimdiff

git config --global difftool.prompt false

git config --global alias.d difftool

或者直接更改配置文件 ~/.gitconfig,添加手工添加配置

常用经验

• 将远程主干合并到本地分支

在代码上线前，这一步非常重要

git fetch && git rebase origin/master

git fetch --all && git merge origin master

分支间文件差异大，频繁切换显示aborting， git status后发现大量为trace的文件

通过下面的命令清理它们
git clean -df

解决版本冲突

暂存本地修改

$ git stash

拉取版本库中最新版本

$ git pull

将本地修改与版本库中最新版本合并

$ git stash pop stash@{0}

解决冲突，使用下面的工具会非常方便

$ git d

• 将源码导出tar包

git对应的功能是归档

mkdir ../working

git archive master | tar -x -C ../working

Git 高级功能

submodule

git submodule add 仓库地址 路径

git submodule update --init

git submodule update

fork后如何同步源的新更新 ?

• 首先要先确定一下是否建立了主repo的远程源

git remote -v

• 如果里面只能看到你自己的两个源(fetch 和 push)，那就需要添加主repo的源：

git remote add upstream URL

• 查看主repo的远程源

git remote -v

• 拉取主repo源的代码

git fetch upstream

• 合并

git merge upstream/master

• 提交

git push

git 项目打包导出

示例， 项目中有为1.0的tag

git archive 1.0 | bzip2 > v1.0.tar.bz2

示例，打包master分支

git archive --format tar.gz --output "../project.tar.gz" master

与 Gerrit 配合使用

提交代码审核 git push origin HEAD:refs/for/mybranch

submodule

一键更新所有submodule，包含所有层级

git submodule update --init --recursive

submodule 更新后，版本不一致，引发意外出core

重新初始化并拉取所有的submodule

git submodule deinit -f --all
git submodule update --init --recursive

高级用法

git rebase

这是介绍rebase用法特别好的博客，http://blog.chinaunix.net/uid-27714502-id-3436706.html

git清除所有commit历史记录

# 新建初始分支
git checkout --orphan new_branch 
# 添加文件
git add -A
# 提交修改
git commit -m "Initial commit" -s
# 覆盖原master分支后push
git branch -D master
git branch -m master
git push origin master -f

常见异常处理

fatal: Not possible to fast-forward, aborting.

处理方法是 rebase
git pull origin master --rebase
git rebase --continue

error: remote unpack failed: error Missing tree

执行push时添加–no-thin选项，参考stackoverflow
git push --no-thin

Server does not allow request for unadvertised object

常为更改了submodule的引用地址造成，可以使用git submodule sync命令解决，参考stackoverflow