shutdown参数

Fear causes the thinking brain to shut down , making the person unable to function at his or her best .If they associate you with this emotion of fear. They will become less functional around you ,and you will have succeeded in not>

设定交换机端口安全策略，一个端口只能有一个mac，超过就shutdown。基本的防护还是要做的。

这台DHCP服务器，有个网段老是被手机连接上来拿掉很多的ip资源，没有ip资源后，内网主机就无法获取ip，连接不上内网。不用想肯定有些接入点有无线ap，但是我老是查不到到底是哪个交换机端口，因为从交换机上查找这个ip的mac这种方法，需要设备在线，但是手机不一定在线，所以老是找不到哪个端口学习到的mac地址。 请各位网友赐招，如何查找出学习到大量mac地址的交换机端口。只要找出哪个交换机的端口就好办事了。 #运维# #网络工程师# #网络安全#

上周，我们看到了新的 Raspberry Pi Zero 2 W 的发布，它基本上是Pi Zero的改进四核版本。该板的一个特点是 Raspberry 设计的 RP3A0封装，它在同一芯片上包括四个 CPU 和 512 MB 的 RAM。虽然 512 MB 的内存按照今天的标准并不算啥，但在嵌入式系统里还算不错的。但是这个定制芯片有一个好处：它让电路板以相当低的功率运行。

RP3A0 封装的额外效率让 Pi Zero 2 W每瓦的运行速度比我们测试的任何其他 Raspberry 板都要快。大多数情况下，它几乎像 Raspberry Pi 3B+ 一样运行，但耗电量要少得多。

Pi Zero 2 有四个内核，但运行频率为 1 GHz，而 3B+ 运行频率为 1.4 GHz，4B 运行频率为 1.5 GHz。

Pi 4 在关闭（shut down）时消耗大约 240 mA 的电流，或 1.2 W！Pi 3 消耗大约 90 mA 或 0.45 W。作为比较，Pi Zero 2 的空闲电流(idle current)类似于 Pi 3 的僵尸电流(zombie current.)。Pi Zero 2 W 的 45 mA 僵尸电流几乎可以忽略不计，而原始 Pi Zero 的电流更小。

尽管如此，我认为 Pi Zero 2 W 不会取代其最接近的竞争对手 3B+，原因很简单，即 Pi 3 具有更多的内存和更多的开箱即用连接。

阅读原文：The Pi Zero 2 W Is The Most Efficient Pi | Hackaday

Linux常用命令

ps -ef|grep java 查看进程

cd /opt/tomcat/bin 进入bin目录

kill -9 10738 杀掉10738进程

./shutdown.sh 关掉tomcat

. /startup.sh 开启tomcat

Two new Vocabulary words of the day!!      

10/23/22

Hamper ~ Chronically

1. Hamper ~ v. Anything that hampers slows progress or makes it difficult to do something. You might think that the presence of your parents hampers your ability to look cool. The verb hamper is for those times when normal progress is slow but not shut down completely. Hamper often describes travel during bad weather, like icy conditions that could hamper holiday travel. Hamper means "slow going." You may have heard of noun form of hamper, a container for holding dirty laundry: If your hamper is full, the need to do laundry could hamper your plans of going out and having fun.

2. Chronic (ally) ~ adv. Subject to a habit or pattern of behavior. i.e. chronic liar. Lasting for a long period of time or marked by frequent recurrence, as certain diseases. i.e. Chronic bronchitis.

Something lasting, usual is or will soon be a problem. Always happening and difficult to solve; doing something again and again.

1... (a) This awful traffic is definitely going to hamper our trip to the beach. (b) Not paying attention to the details>

世界首座小模块式反应堆完成并网发电 China is Home to World's First Small Modular Nuclear Reactor

Bloomberg News Tue, December 21, 2021

小型模块化反应堆：small modular reactor （SMR）

China Huaneng Group Co.’s 200-megawatt unit 1 reactor at Shidao Bay is now feeding power to the grid in Shandong province, the China Nuclear Energy Association said in a WeChat post. A second reactor is undergoing tests before being connected and putting the plant into full commercial operations in the middle of next year.

The plant is the world’s first pebble-bed modular high-temperature gas-cooled reactor, heating up helium instead of water to produce power. It’s a so-called fourth generation reactor, designed to shut down passively if something goes wrong -- in contrast to active systems that may not be able to trigger safety measures if power fails, which is what happened at the Fukushima Daiichi accident in Japan a decade ago.

No country in the world is investing in nuclear power like China, which is expected to pour as much as $440 billion into new plants over the next decade and a half and overtake the U.S. as the top generator of nuclear electricity.

At 200 megawatts, the small module reactors -- or SMRs -- are about>