Ceph distributed storage dual active service configuration

Ceph is born with the concept of two places and three centers. The so-called double activity is two multi-site. Ceph two data centers can be in one cluster or in different clusters. The structure diagram (other mountain stone) is as follows: 1. Environmental information 2. Create Master zone In a multi site configuration, all RGWS will receiv ...

Posted on Fri, 22 May 2020 05:16:47 -0400 by Coreyjames25

GCD deals with multithreading and synchronous operation of Han Junqiang's blog

Original address: http://blog.csdn.net/qq_31810357/article/details/78906308 No reprint without permission! GCD uses dispatch group notify, dispatch group enter, dispatch group leave to handle multithreaded synchronization operations 1, Introduction Dispatch [group] enter: notify the group that the following tasks will be executed in the g ...

Posted on Sun, 03 May 2020 11:47:00 -0400 by mattnoble

Swift: asynchronous chain call of alamofire

Alamofire It is a common swift network library. This paper will analyze the chain call of Alamofire. Friends who are not familiar with Alamofire can read this first Article Chain call example extension Int { func add(_ num: Int) -> Int { return self + num } func minus(_ num: Int) -> Int { return s ...

Posted on Tue, 31 Mar 2020 12:46:26 -0400 by scritpkid

openstack Learning Notes 3: Kestone Installation Deployment

1. Keystone's architecture Keystone(OpenStack Identity Service) is the module in the OpenStack framework responsible for managing authentication, service rules, and service token functions.Keystone is the core module of Openstack, providing authentication and authorization services for Nova, Glance, Swift, Cinder, Neutron, and Horizon.The Keys ...

Posted on Mon, 30 Mar 2020 17:06:53 -0400 by phreek

Runtime objc4-756.2 analysis of the source code relationship between class RO and class RW in objc class

First source code struct objc_class : objc_object { // Class ISA; Class superclass; cache_t cache; // formerly cache pointer and vtable class_data_bits_t bits; // class_rw_t * plus custom rr/alloc flags class_rw_t *data() { return bits.data(); } ....(H ...

Posted on Fri, 21 Feb 2020 04:41:17 -0500 by deft

C# 8.0 New Feature Two: Default Interface Implementation

In C#8.0, a new feature for interfaces is the ability to specify default implementations to extend existing implementations and the possibility of interoperability with APIs for Android and Swift.Let's look at the specific rules and implementation of this feature. 1. Main scenarios: New members can be added without disrupting existing implement ...

Posted on Thu, 20 Feb 2020 11:14:52 -0500 by sijis

Bitcoin real-time market application practice [Swift code]

In this article, we will learn how to use websocket to develop a Swift application that can receive and display Bitcoin / Bitcoin prices in real time. Let's take a look at our final results: Bitcoin development links: Java bitcoin docking tutorial C-bitcoin docking tutorial PHP bitcoin docking tutorial Bitcoin data analysis ETL tool Bitcoin ...

Posted on Wed, 19 Feb 2020 20:53:21 -0500 by OmegaB

Email from PHP page using GMail SMTP server

I am trying to send e-mail through GMail's SMTP server from a PHP page, but this error occurred: Authentication failed [SMTP: SMTP server does not support authentication (Code: 250, response: mx.google.com, service for you, [98.117.99.235] size is 35651584 8-bit mime starttls enhancedstatusscodes pipelining]] Can I help you? This is ...

Posted on Thu, 13 Feb 2020 02:45:46 -0500 by ryanlwh

fastlane iOS Auto Packaging

fastlane package is used for unattended submission of application packages to TestFlight, dandelion, fir.im and other third-party platforms. I feel that the speed may be slower, but the advantage is Unattended Automatically pull the latest code Automatic clean to ensure that the code has no cache inter ...

Posted on Thu, 16 Jan 2020 06:25:16 -0500 by shiznatix

Data transmission between OC and swift

brief introduction This project mainly introduces several common value transfer methods (attribute value transfer, code block value transfer, agent value transfer, notification) between oc and swift and within swift If you have any questions about the bridge between oc and swift, please refer to: OC and swift bridge intermodu ...

Posted on Sun, 05 Jan 2020 12:33:05 -0500 by AsiaUnderworld