learn devops from scratch

Learn Linux_06_Linux management commands from scratch I. df, du 1, df (1) df (2) df-h explicitly displays the usage of disk partitions.(3) df test query which partition test belongs to (4) example [1] usage of the explicit disk partition [2] files first in the root directory should not be mounted to the root directory $ df sys/ 2. Run du (1) du (2) du-h to view the directory usage in an intuitive way. (3

Learn how to create H5 applications from scratch-V3.0, loading, background music and automatic switching, h5v3.0 Our first H5 application was made through V1.0 and V2.0, which is getting more and more amazing. This time, we continue to dress her up to make her more beautiful. Task 1. Add the loading animation before page loading to improve the user experience;2. Add background music, play automatically,

Learn YII2 framework from scratch (ii) Install the extension via Composer, Yii2composer At present, the expansion of YII2 is not many, as of today, a total of 33 on the official website, but there are no lack of these plugins have excellent extension plug-ins, I tried a few, found a series of good YII2 plug-ins, the author is from India's Krajee team, they write plug-ins are very useful. Recommend. Krajee

name;7.}8. Public void setName (String name) {9. this. Name = name;10.}One. public String Getgender () {return gender;13.}Public void Setgender (String gender) {. This . gender = gender;16.}17.18.}Finally note the Spring boot entry class plus @enableconfigurationproperties1. @SpringBootApplication2. @EnableConfigurationProperties ({wiselysettings. Class, Wisely2settings. class})3. Public class DemoApplication {4.5. Public static void main (string[] args) {6. Springapplication.run (demoapplica

rendering the corresponding view (primarily for resource cleanup work)According to the output can understand the order of execution of the Interceptor chain (the specific principle of introduction, we look for Niang a ask to know)Last but not least: the Interceptor chain will only go through Dispatcherservlet requests, and our custom servlet requests will not be intercepted, such as our custom servlet address http://localhost:8080/ MyServlet1 is not intercepted by interceptors. And no matter wh

method.C. If the parent class is called with a constructor method: The call must be displayed in the constructor of the subclass; Super can only invoke the direct parent method;6. Access permission characters　　(1) class access: public/default, public classes can be accessed in other packages;(2) Access rights of members Access rights Current Class Current Package Derived classes Other Locations Private OK The d

value of the display, and most designers now tend to use pixels (px) as units.2, EMis the font-size value of the given font for this element, 1em = 14px If the element's font-size is 14px, and 1em = 18px If the font-size is 18px. The following code:P{font-size:12px;text-indent:2em;}The code above is the ability to indent the first line of a paragraph by 24px (that is, the distance of two font sizes).A special case is noted below:However, when Font-size is set to EM, the criteria for this calcul

identifier is a reference. Point to the object inside the heap.Package Com.ray.ch14;public class Test {public static void main (string[] args) {int[] ints = new int[] {1, 2, 3}; System.out.println (INTs);}}Output:[[Email protected]The above output is actually a memory address.6. The underlying type array stores the values of the underlying type. Object arrays are stored as references to objects (memory addresses)Package Com.ray.ch14;public class Test {public static void main (string[] args) {in

the request message and sends it out. After the server-side discovery of the cookie sent by the client, it checks exactly which client sent the connection request, compares the records on the server, and finally gets the user's status information.Persistent connection and pipeliningWhen we visit an HTML page with many illustrations, there are many HTTP requests to access the images. If you need to repeatedly establish and disconnect TCP connections for each request, this can cause a lot of addi

existing file or RPM-IVH--force glibc-2.3.2-11.9.rpm ignoring file conflicts4. Unload RPM Package (1) rpm-e glibc(2) When uninstalling, you do not need to specify the version number of the package, if the other package depends on the package you want to uninstall, the uninstallation will produce an error message.5. Upgrade RPM Package (1) RPM-UVHGLIBC-2.3.2-11.9.RPM (Common）(2) Note: Even if the GLIBC package is not installed on the system, this command can also be installed successfully.6. Que

variable with an initial value of Hello } Test (); alert (message); // HelloBecause the Var is omitted here, the message becomes a global variable, so as long as the test () function is called once, the variable is defined and can be accessed anywhere outside the function.Omit var to define a variable: The variable can be accessed globally whenever a function that defines the variable is called once. This method of defining variables is also an implicit declarationiv. scope an

Cheer up, first as a non-computer professional graduate, I think. This want to learn computer, or rely on their own, trained is not necessarily Daniel. The non-computer is not necessarily all rookie ... Well, let's start with the first installment of today's ———— install LinuxThis time is done in the VBox virtual machine. Personal feeling vbox more useful than VMware, the main occupation system resources are not many. Take CentOs5.5 as an example----s

javascript--the client Web browser scripting language.What is language?Used for communication, with complete syntax and explicit semantics .A complete set of JavaScript implementations consists of three different parts:1,ecmasript (CORE)Just a description that defines all the properties, methods, and objects of the scripting language. That is, a language has a clear code of use and use of the method.It provides the syntax, operators, and basic objects of JavaScript that are necessary to implemen

Package com.kfit.base.scheduling;Import org.springframework.context.annotation.Configuration;Import org.springframework.scheduling.annotation.EnableScheduling;Import org.springframework.scheduling.annotation.Scheduled;/*** Scheduled Tasks* @author Administrator**/@Configuration@EnableSchedulingpublic class Schedulingconfig {@Scheduled (cron = "0/20 * * * * *?")//every 20 secondspublic void Scheduler () {System.out.println (">>>>>>>>> Schedulingconfig.scheduler ()");}}

Four cases of this in JavaScript (non-strict mode) 1. When this function is the event handler, this points to the event source.2. When this function is a constructor, this points to the new object.3. This refers to the object to which the function belongs.4, when this function does not belong to the object, this point to the Window object"Utf-8"/> "Box" class="Box"style="height:100px, width:100px, background: #f3f3f3;">Learn from

writing if in the window.onload call, proposed to put the anonymous function,//related to the scope of the problem, JS run to this error, can also adjust the location of JS reference　　　　Timer:Syntax: setinterval (function or code string, specified time (ms));Executes a function or a string of code in a specified period (in milliseconds).Clear Timer: clearinterval ();var num = 6;var timer = setinterval (function () {console.log (--num); if (num = = 0) {clearinterval (timer);}}, 1000);　　

. Console.log (navigator.useragent);7:window Events OnResize: Window Scaling event. Window.onresize = function () {Console.log (2)} OnLoad: The Load event page is executed after it has finished loading. //Get browser window width/height Window.onload = function () {Console.log (document.documentElement.clientWidth) Console.log ( Document.documentElement.clientHeight)} Onscroll: Scrolling event. //Get browser scroll bar hidden width/height Chrome (body),

Hello everyone, here is "learn the Web series from scratch" and synchronize updates at the following address ... Github:github.com/daotin/web Public number: The top of the Web front Blog Park: http://www.cnblogs.com/lvonve/ csdn:blog.csdn.net/lvonve/ Here I will start with the Web front End 0 Foundation, step-up learning web-related knowledge points, during the period will also sh

Hello everyone, here is "learn the Web series from scratch" and synchronize updates at the following address ... Github:github.com/daotin/web Public number: The top of the Web front Blog Park: http://www.cnblogs.com/lvonve/ csdn:blog.csdn.net/lvonve/ Here I will start with the Web front End 0 Foundation, step-up learning web-related knowledge points, during the period will also sh

Hello everyone, here is "learn the Web series from scratch" and synchronize updates at the following address ... Github:github.com/daotin/web Public number: The top of the Web front Blog Park: http://www.cnblogs.com/lvonve/ csdn:blog.csdn.net/lvonve/ Here I will start with the Web front End 0 Foundation, step-up learning web-related knowledge points, during the period will also sh