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#ssh隧道有3种类型：

#动态端口转发（Socks 代理）-D

ssh -D 9090 ssh-host

产生一个本地sock5代理，端口是9090

#本地端口转发（正向代理）-L

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#!/bin/bash

cd  /data/publish/jiayu-bbs

# log git version to jar
version=src/main/resources/version.txt
git branch -v > $version
git log --pretty=format:'%h - %an, %ad : %s' --graph -10 >> $version

# delete config

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通过例子学 Rust
https://rustwiki.org/zh-CN//rust-by-example/

RustPrimer
https://rustcc.gitbooks.io/rustprimer/content/

Redox 操作系统
https://www.redox-os.org/

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Java 中对final 字段的修改，有很多黑魔法。

org/apache/commons/lang3/reflect

https://stackoverflow.com/questions/3301635/change-private-static-final-field-using-java-reflection/31268945#31268945

# System.in,out,err允许重定向

``` java
import java.lang.reflect.*;

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# default editor 
export EDITOR=vim
# editor
visudo
# feedback password
Defaults        env_reset, pwfeedback
# moilioncircle group sudo without password
%moilioncircle ALL=NOPASSWD: ALL

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docker ps // 查看所有正在运行容器
docker stop containerId // containerId 是容器的ID

docker ps -a // 查看所有容器
docker ps -a -q // 查看所有容器ID
docker stop $(docker ps -a -q) //  stop停止所有容器
docker  rm $(docker ps -a -q) //   remove删除所有容器

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# host
sudo iptables -t nat -A POSTROUTING -s 192.168.56.0/24 -j MASQUERADE  


# guest


sudo vi /etc/network/interfaces

auto enp0s3

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wget --tries=3 --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u162-b12/0da788060d494f5095bf8624735fa2f1/jdk-8u162-linux-x64.tar.gz -O ./jdk-8u162-linux-x64.tar.gz

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#!/bin/bash

master_host=jiayu-app-master
master_ip=`grep $master_host /etc/hosts | awk '{print $1}'`
master_here=`ifconfig -a | grep $master_ip`

this_host=""
that_host=""

if [ -z "$master_here" ]; then

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# append to [Service]
sudo tee -a /lib/systemd/system/mysql.service << EOF
LimitNOFILE=infinity
LimitMEMLOCK=infinity
EOF

sudo systemctl daemon-reload
sudo service mysql restart