Programming VIP

Example topology: DR1 and DR2 deploy keepalived and lvs as the master-slave or master architecture, and RS1 and RS2 deploy nginx to build web sites. Note: the time of each node needs to be synchronized (ntpdate ntp1.aliyun.com); turn off firewalld (systemctl stop firewalld.service, systemctl disable firewalld.service), and set selinux to allow ...

Android Development - Android Studio - front end introduction picture 1. Create a new Activity named ImageViewActivity 2. Set the button in activity main.xml to 3. Declare ImageViewActivity in MainActivity and set click event. package com.example.ayb.helloworld; import android.content.Intent; import android.support.v7. ...

Local yum source configuration In our newly installed REDHAT 7 system, there is no configuration source. In order to save space and improve the operation efficiency, many packages are not installed. When we find that there are missing packages, we need to install them by ourselves. The installation needs to use the yum source. ...

Author| Jeskson Source|Dada Front End Bistro How functions are defined: The first is a function declaration; the second is a function expression. Grammar: function functionName(arg0, arg1, arg2) { // Function Body } In Firefox, Safari, Chrome, and Opera: This property gives you access to the name specified by this function. console.log(funct ...

After more than a week of crawling classes, the editor finally couldn't help but decide to write the crawler program manually. Just as LJ encouraged the students to share their results and rewarded their excellent works, he organized the crawl process of crawling high definition Wallpapers of major games with Python programming for submission a ...

Paging controller 1. Paging controller Import third party PagingMenuController Third party links: https://github.com/kitasuke/PagingMenuController Import links using third-party methods: http://www.hangge.com/blog/cache/detail_1656.html Using PagingMenuController ViewController.m ViewController1,ViewController2,ViewController3,V ...

os: ubunbu 16.04 postgresql: 9.6.8 repmgr: 4.1.1 192.168.56.101 node1 192.168.56.102 node2 Under the premise that the production environment ensures the stability of the network, the database can auto failover is the best state. For synchronous replication, it is recommended to configure two Slavs. For asynchronous replication, ...

KVM virtual machine: 1.KVM is the abbreviation of kernel based virtual machine. It is an open source system virtualization module. It has been integrated into various major Linux distributions since Linux 2.6.20. It uses Linux's own scheduler for management, so compared with Xen, its core source code is very few. KVM has become one of the mai ...

Ajax: asynchronous JavaScript and XML, using JavaScript to execute asynchronous network requests If you want users to stay on the current page and send out new HTTP requests at the same time, you must send this new request with JavaScript. After receiving the data, you can use JavaScript to update the page. In this way, users wi ...

In general, it is in the sealed jar package. Here, you can implement this function through the original steps##############################################################################Client steps:1. Determine the connection address and port2. Read files3. Get socket output stream4, send5. Send the end tag to the server to end the read opera ...