绝大多数MySQL性能指标可以通过以下两种方式获取：
（1）mysqladmin
使用mysqladmin extended-status命令获得的MySQL的性能指标，默认为累计值。如果想了解当前状态，需要进行差值计算；加上参数 —relative(-r)，就可以看到各个指标的差值，配合参数—sleep(-i)就可以指定刷新的频率。
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The vast majority of MySQL performance metrics can be obtained in the following two ways:
(1) mysqladmin
The MySQL performance metrics obtained with the mysqladmin extended-status command are cumulative values by default. If you want to know the current state, you need to compute the difference; adding the parameter —relative(-r) lets you see the delta of each metric, and with the parameter —sleep(-i) you can specify the refresh frequency.
权限误区 并不是说下面的排序就证明权限越来越大除了readWrite权限用户外(root权限用户也包括)，其它用户都不具备对数据库的写入权限，除 read 权限外，其它用户都不具备对数据库中的读权限，每个权限的功能各不一样(除root外)
Misconceptions about permissions — the ordering below does not mean the permissions get bigger and bigger. Apart from users with the readWrite permission (root users included), no other users have write permission on a database, and apart from the read permission, no other users have read permission on the data in a database. Each permission has a different function (except root).
学Python，想必大家都是从爬虫开始的吧。毕竟网上类似的资源很丰富，开源项目也非常多。
Python学习网络爬虫主要分3个大的版块：抓取，分析，存储
当我们在浏览器中输入一个url后回车，后台会发生什么？
简单来说这段过程发生了以下四个步骤：
查找域名对应的IP地址。
向IP对应的服务器发送请求。
服务器响应请求，发回网页内容。
浏览器解析网页内容。
When learning Python, most of us probably started with web scraping. After all, there is plenty of similar material online and a great many open-source projects too.
Learning web scraping in Python breaks down into 3 big areas: fetching, parsing, and storing.
When we type a url into the browser and hit enter, what happens behind the scenes?
Put simply, these four steps take place:
Look up the IP address corresponding to the domain name.
Send a request to the server at that IP.
The server responds to the request and sends the page content back.
The browser parses the page content.
当我们的ES集群搭建完成以后，我怎么能看到集群中各个节点状态以及主节点和健康情况呢，如下讲解使用curl命令来与ES集群进行交互、分别有查询主节点情况、集群状态、以及创建索引查看索引、查看分片以及对ES集群进行查询请求等操作。
Once our ES cluster is set up, how can I see the status of each node in the cluster, as well as the master node and health status? Below I’ll explain how to use the curl command to interact with the ES cluster, covering checking the master node, the cluster status, creating an index and viewing indexes, viewing shards, and sending query requests to the ES cluster, and so on.
数据结构
- SplDoublyLinkedList （双向链表）
SplDoublyLinkedList::add —在指定的索引处添加/插入新值 SplDoublyLinkedList::bottom —从双向链表的开头偷看节点 SplDoublyLinkedList::__ construct —构造一个新的双向链表 SplDoublyLinkedList::count —计算双向链接列表中的元素数 SplDoublyLinkedList::current —返回当前数组条目 SplDoublyLinkedList::getIteratorMode —返回迭代模式 SplDoublyLinkedList::isEmpty —检查双向链接列表是否为空 SplDoublyLinkedList::key —返回当前节点索引 SplDoublyLinkedList::next —移至下一个条目 SplDoublyLinkedList::offsetExists —返回所请求的$ index是否存在 SplDoublyLinkedList::offsetGet —返回指定的$ index处的值 SplDoublyLinkedList::offsetSet —将指定的$ index处的值设置为$ newval SplDoublyLinkedList::offsetUnset —取消指定$ index处的值 SplDoublyLinkedList::pop —从双向链接列表的末尾弹出一个节点 SplDoublyLinkedList::prev —移至上一个条目 SplDoublyLinkedList::push —将元素推入双向链接列表的末尾 SplDoublyLinkedList::rewind —将迭代器倒回开始 SplDoublyLinkedList::serialize —序列化存储 SplDoublyLinkedList::setIteratorMode —设置迭代模式 SplDoublyLinkedList::shift —从双链表的开头移出一个节点 SplDoublyLinkedList::top —从双向链表末尾窥视节点 SplDoublyLinkedList::unserialize —反序列化存储 SplDoublyLinkedList::unshift —为双向链接列表添加一个元素 SplDoublyLinkedList::valid —检查双向链表是否包含更多节点
- SplDoublyLinkedList （双向链表）
Data Structures
- SplDoublyLinkedList (Doubly linked list)
SplDoublyLinkedList::add — Add/insert a new value at the specified index SplDoublyLinkedList::bottom — Peek at the node from the beginning of the doubly linked list SplDoublyLinkedList::__ construct — Constructs a new doubly linked list SplDoublyLinkedList::count — Counts the number of elements in the doubly linked list SplDoublyLinkedList::current — Returns the current array entry SplDoublyLinkedList::getIteratorMode — Returns the iteration mode SplDoublyLinkedList::isEmpty — Checks whether the doubly linked list is empty SplDoublyLinkedList::key — Returns the current node index SplDoublyLinkedList::next — Moves to the next entry SplDoublyLinkedList::offsetExists — Returns whether the requested $ index exists SplDoublyLinkedList::offsetGet — Returns the value at the specified $ index SplDoublyLinkedList::offsetSet — Sets the value at the specified $ index to $ newval SplDoublyLinkedList::offsetUnset — Unsets the value at the specified $ index SplDoublyLinkedList::pop — Pops a node from the end of the doubly linked list SplDoublyLinkedList::prev — Moves to the previous entry SplDoublyLinkedList::push — Pushes an element onto the end of the doubly linked list SplDoublyLinkedList::rewind — Rewinds the iterator to the beginning SplDoublyLinkedList::serialize — Serializes the storage SplDoublyLinkedList::setIteratorMode — Sets the iteration mode SplDoublyLinkedList::shift — Shifts a node from the beginning of the doubly linked list SplDoublyLinkedList::top — Peeks at the node from the end of the doubly linked list SplDoublyLinkedList::unserialize — Unserializes the storage SplDoublyLinkedList::unshift — Prepends an element to the doubly linked list SplDoublyLinkedList::valid — Checks whether the doubly linked list contains more nodes
- SplDoublyLinkedList (Doubly linked list)
Kubernetes 容器编排平台
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Kubernetes! 说起云原生应用，怎么能不提 Kubernetes 呢？Google 发明的 Kubernetes 无疑是最著名的基于容器的应用程序的容器编排平台，而且它还是一个开源工具。
什么是容器编排平台？通常，一个容器引擎本身可以管理几个容器。但是，当你谈论数千个容器和数百个服务时，管理这些容器变得非常复杂。这就是容器编排引擎的用武之地。容器编排引擎通过自动化容器的部署、管理、网络和可用性来帮助管理大量的容器。
Docker Swarm 和 Mesosphere Marathon 也是容器编排引擎，但是可以肯定地说，Kubernetes 已经赢得了这场比赛（至少现在是这样）。Kubernetes 还催生了像 OKD 这样的容器即服务（CaaS）平台，它是 Kubernetes 的 Origin 社区发行版，并成了 Red Hat OpenShift 的一部分。
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Kubernetes container orchestration platform
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Kubernetes! When talking about cloud native applications, how could we not mention Kubernetes? Invented by Google, Kubernetes is undoubtedly the most famous container orchestration platform for container-based applications, and it is also an open source tool.
What is a container orchestration platform? Normally, a container engine itself can manage a few containers. But when you are talking about thousands of containers and hundreds of services, managing those containers becomes very complicated. That is where a container orchestration engine comes in. A container orchestration engine helps manage a large number of containers by automating their deployment, management, networking, and availability.
Docker Swarm and Mesosphere Marathon are also container orchestration engines, but it is safe to say that Kubernetes has already won this race (at least for now). Kubernetes has also given rise to container-as-a-service (CaaS) platforms like OKD, which is the Origin community distribution of Kubernetes and became part of Red Hat OpenShift.
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在使用openvas的过程中发生了一些小事情。
使用命令
sudo openvas-check-setup
检查安装是否完整时，总是报错。提示说是nvt问题，反反复复，后来确认了才发现是数据更新问题。
用命令
sudo greenbone-scapdata-sync
A few small things happened while I was using openvas.
Using the command
sudo openvas-check-setup
to check whether the installation was complete, it always reported an error. The message said it was an nvt problem, over and over again; later, once I confirmed it, I found out it was actually a data update problem.
With the command
sudo greenbone-scapdata-sync
偶然研究一下攻击wordpress的工具wpscan根据网上示范的教程，发现坑特别多。
大部分都是老版本的教程，最新版命令有所改动，已经剔除—wordlist改为-P。
需要在官方网站注册生成密钥，本地使用。
另外密码字典需要自己用crunch生成,大部分弱密码都可以爆破。
I happened to look into wpscan, the tool for attacking WordPress, following tutorials demonstrated online, and found there are an awful lot of pitfalls.
Most of them are tutorials for old versions; the commands changed in the latest version — —wordlist has been dropped in favor of -P.
You need to register on the official site to generate a key and use it locally.
Also, you have to generate the password dictionary yourself with crunch; most weak passwords can be brute-forced.
