Programming VIP

Jboss startup error: Unrecognized VM option 'MaxPermSize=256m' Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. Translated as: Unrecognized VM option 'MaxPermSize=256m' Error: unable to create Java virtual machine. Error: fatal exception occurred. The program will exit. ...

File directory class pwd instruction pwd (Function Description: displays the absolute path of the current working directory) Case: displays the absolute path of the current working directory # pwd ls instruction ls [ Options] [Directory or file] -a : Displays all files and directories in the current directory, including hidden ones. ...

Standard file descriptors Concept of file descriptor: a file descriptor is an integer greater than or equal to 0, which means the sequence number of items in the file opening table of the process (starting from 0). For a process, a file descriptor is a handle that operates on an open file (or a device file, or a socket connection). This entry ...

Article catalogue catalogue preface 1, Why ElasticSearch+Kibana+Serilog? 2, Construction steps 1. Import the required Nuget package 2. Add the following code to Startup 3. Add the following configuration in appsetting 3. Build ElasticSearch+Kibana 4. Simple use of kibana summary   preface Because the current proj ...

DIP: the IP address of the scheduler RIP: the IP address of the real server in the background VIP: virtual IP used for service provision Compared with NAT mode, DR mode of LVS is more complex and difficult to implement, because it is closer to hardware based load balancing. Although the performance is still lower than that of hardware based ...

Install JDK Download Oracle JDK https://www.oracle.com/java/technologies/javase-jdk14-downloads.html 1. Decompress tar -xvf jdk-14.0.2_linux-x64_bin.tar.gz 2. Configuration file vim /etc/profile Add the following in the last line export JAVA_HOME=/usr/local/jdk/jdk-14.0.2 export PATH=$JAVA_HOME/bin:$PATH export CLASSPATH=.:$JAVA ...

elementary analysis: As we all know, in the front end of the front-end and back-end separation project, we use Jquery to realize ajax asynchronous request and data interaction with the back-end: that is, take the data from the front-end page and request it to the corresponding controller layer method, then the back-end processes the data reque ...

Tip: after the article is written, the directory can be generated automatically. Please refer to the help document on the right for how to generate it preface Environment and related software: VMWare 14, CentOS 7, SecureCRT. Tip: the following is the main content of this article. The following cases can be used for reference 1, Fil ...

1, Introduction to load balancing 1.1. Challenges faced by large websites Large websites have to face the challenges of huge number of users, high concurrency, massive data and so on. In order to improve the overall performance of the system, vertical expansion and horizontal expansion can be adopted. Vertical expansion: in the early stage ...

In the website, the http request is stateless, that is, when user 1 connects to the server and logs in successfully, when refreshing the website and reconnecting, it still needs to log in again. Different users cannot be identified only through general information. The emergence of cookies is to solve this problem and realize the function of re ...