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Booting Debug mode is didn’t smoothly on MacOS

Cause: Java8 Bug

方法一

查看本机名字

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hostname

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sudo vim /private/etc/hosts
# replace 127.0.0.1       localhost 
# with 127.0.0.1       localhost       [hostname].local

方法二

vm option 添加

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-Djava.net.preferIPv4Stack=true

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Introducation

What is a Java Agent?

In general, a java agent is just a specially crafted jar file. It utilizes the Instrumentation API that the JVM provides to alter existing byte-code that is loaded in a JVM.

For an agent to work, we need to define two methods:

  • premain – will statically load the agent using -javaagent parameter at JVM startup
  • agentmain – will dynamically load the agent into the JVM using the Java Attach API

An interesting concept to keep in mind is that a JVM implementation, like Oracle, OpenJDK, and others, can provide a mechanism to start agents dynamically, but it is not a requirement.

Refer

https://www.baeldung.com/java-instrumentation
https://juejin.im/post/5ac32eba5188255c313af0dd
https://www.ibm.com/developerworks/cn/java/j-lo-jse61/index.html
http://www.iocoder.cn/SkyWalking/agent-plugin-system/

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优势

  1. 个人所得税，不交
  2. 公司所得税，不交
  3. 资本利得税，不交
  4. 不动产税，不交
  5. 遗产税，不交

VIE

Variable Interest Entity 可变利益实体

Example

在新加坡生产一台 Mac Pro，以$200价格卖给 -> 开曼群岛财务公司，以$900卖给 -> 美国Apple公司，以$1000 -> 分销商

在美国，Apple实际上只为$100交税，规避了大部分税收。

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结构层次

  1. 董事会 board of director，制定政策
  2. 董事（公司的老板们）
  3. 董事长 chairman of the board（董事们任命)，股份最多
  4. CEO（chief executive officer），行政级别最高领导人，最高决策人，董事会任命，执行政策
  5. CFO（chief financial officer）部门老大
  6. COO（chief operating officer）部门老大
  7. CTO（chief technology officer）部门老大
  8. 总监，主管，项目经理 etc.

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Conf

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# use let's encrypt ssl
listen 80;
listen 443 default_server ssl;
ssl_certificate /etc/letsencrypt/live/sit.leverup.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/sit.leverup.com/privkey.pem;
charset utf-8;
server_name sit.leverup.com;

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Ubuntu

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https://caddyserver.com/download

curl https://getcaddy.com | bash -s personal

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Usage

configure service

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# /etc/systemd/system/test.service

[Unit]
Description=Spark service

[Service]
ExecStart=/path/to/spark/sbin/start-all.sh

[Install]
WantedBy=multi-user.target
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cat >> /etc/systemd/system/mosh-server.service <<EOF
[Unit]
Description=Mosh Service

[Service]
ExecStart=/usr/bin/mosh-server

[Install]
WantedBy=multi-user.target
EOF

boot service

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sudo systemctl enable mosh-server
sudo systemctl start mosh-server

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Usage

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cat >> /etc/systemd/system/mosh.service <<EOF
[Unit]
Description=Mosh Service
After=network.target
After=systemd-user-sessions.service
After=network-online.target

[Service]
Type=simple
ExecStart=/mosh.sh
TimeoutSec=30
Restart=on-failure
RestartSec=30
StartLimitInterval=350
StartLimitBurst=10

[Install]
WantedBy=multi-user.target
EOF