Ali cloud management API use dynamic domain name resolution ddns

The internet

Dynamic DNS，Acronym ddns，It is different from our usual DNS resolution，But it is intended to deal with the kind of no fixed public IP address resolution server。

Typical usage is：Construction of small home broadband server，There is no fixed IP，Want online，In addition to writing scripts mail outside，The only way this can go ddns。

as far as I can tell，The most famous is probably the notoriously unstable and difficult to use the peanut shells。If there is a foreign dynu also very good。

Ali now open cloud API，So we can use Ali cloud AP[……]

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embedXcode find Arduino system library header files

Embedded

Arduino play on Mac，In addition to the official use of the simple addition of IDE，You can also choose to use Xcode to develop。

use embedXcode Plug-ins can make Xcode transformed into embedded development IDE，Including native compilation、Uploading full set of features。

but，In the standard library when it is a problem，For example, the figure above，I was testing nRF24L01 The SPI module，Need to use [crayon-67b991133d[……]

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Solving MySQL suddenly occupy all memory problems

Linux

Pocketed a while ago on migrating from virtual host to an independent VPS，Maintenance of this all is my own。For performance，If your environment，Nature does not use the old configuration。

I use Ubuntu Server 16.04 + PHP 7.0 + Nginx + MySQL 5.7 In short，Stepped on a lot of holes。

From now on，To record

Why MySQL is suddenly filling up memory

At first I thought it was a VPS under attack，But not only this traffic View Card[……]

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Ubuntu 16.04 Adding memcached and redis extended PHP7

Linux Wordpress

Switch to PHP 7 after that，Site speed boost，But usually just one of extension may not yet support PHP7.

Memcached

For example, I now use the latest Ubuntu 16.04，Although it built in PHP 7 source，But it has not memcached，Fortunately, however,，It has supported PHP 7 ，Not just the source of it，We compile it manually。

To install memcached，You need to install the dependent libraries libmemcached

FromHereturn up[……]

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Swift in the single mode

Swift

In the process of writing the code，We will meet when the need to ensure that only one instance of the global，This time use the singleton pattern。

Single mode--this ensures that only one instance of a class，And provide a global point of access to。

What about how to implement the singleton pattern? We take a look at the classic Java code，How to implement the singleton pattern。

Our online search for "Java singleton pattern" will be able to find plenty of readily available code snippets，Here are random excerpts of a report：
[crayon-67b991133e2099001[……]

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Rollover to the Ubuntu Server 16.04

Linux

We vps，In general, Ubuntu is still easy to use，On the one hand it is more friendly to novice，On the other hand are some common service configuration can be a key installation。Plus Niubi ufw，Really perfect。

but，Now not all vps service providers are able to provide the latest Ubuntu Server 16.04，what a pity。It has so many benefits of，For example, the native library is php7，No additional compiler ......

So since it is linux，Will be able to directly upgrade to the new version - I remember Ubu[……]

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Please use caution in the C # var

C#

we all know，For example, Swift 、 Python,，You do not need to declare a special variable type - although they are type-safe languages，But it can help you to dynamically infer the type of a variable in context。

Python do what you do，Write a name is the default declare a variable；And Swift，It is more close to our topic，It also uses where 。

If you have had experience in the use Swift，Again using C #[……]

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Let's Encrypt using the VPS configure SSL for Nginx

Linux

Before we have talked about how to siteOpen Full Site SSL Now we take a look at how the vps to Nginx open Let's Encrypt certificate and automatically update。

The contents of this article older，About letsencrypt configuration article，I wrote a new，Perhaps you can refer to a look：letsencrypt tool renamed certbot

Set the environment

First of all，We should prepare the installation environment，This time I am using CentOS 6.7[……]

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