Programmer Group

CentOS7 modifying the network card name eth0 The centos7 virtual machine I installed in VMWare workstation has two network cards. The default network card names are eno16777736 and eno33554984 [root@controller ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1     link/loopback 00:00:00:00:00:00 brd 00: ...

Blog move, original address: Learning dl Library in https://langzi989.github.io/2017/10/16/Unix/ In Linux, static link library and dynamic link library are two ways of code sharing between processes. Linux provides system calls to load and process dynamic connection libraries in the < dlfnc. H > library, which is very conv ...

This post is a case post. For an overview of the principles and related overviews of LVS Load Balancing Clusters, please refer to the post: LVS Load Balancing Cluster for Centos 7 1. Introduction to Cases 1. Case Environment 2. Experimental results Using NAT-mode clustering technology, the LVS load dispatcher is a gateway server where all ...

I. working principle of DR mode          As shown in the figure, the working principle of LVS-DR has been explained in the figure. Let's list the characteristics of LVS-DR mode: 1. RIP can use private address or public network address. If public network address is used, RIP can be accessed directly. 2. All requested packets must pass through ...

Preface mac record and port scan script Develop system monitoring script I. sharing of script programming steps 1.1 script programming steps 1.2 demand analysis According to the requirements of system management, the functions, levels, commands and statements of the script are analyzed 1.3 command test Test the commands to be used one by ...

I. making Dockerfile file 1. Deploy on 172.19.2.51 mkdir -pv /opt/git git clone http://172.19.2.140:18080/lvqingshan/gcgj.git cd /opt/git/gcgj scp app@172.19.2.1:/home/app/portal-tomcat/webapps/portal.war ./ scp app@192.168.37.34:/home/app/portal-tomcat/conf/server.xml ./ vim Dockerfile FROM tomcat:7.0.77-jre8 ADD server.xml /usr/local/tomcat ...

2018 / 09 / 19 server room The story is as follows: one of the disgusting things that my colleagues found was that the original person in charge gave 500M space to the / boot partition of the server. I would think it's not small. However, after many kernel upgrades since 16 years, GG has not been uninstalled.As a result, a lot of compilation an ...

java using JNI to call C under Linux++ 1.JNI introduction JNI is Java Native Interface(Java local interface), which is a protocol. Its main function is to realize java calling C / C + + code (Class Library), or C / C + + calling java code 2. prepare JNI First, use java h to generate. H header file according to. java file, ...

tcp socket communication optimization and troubleshooting under Linux @Date 2018.12.09 I. optimization 1. TPC receiving window Problem: when the receiving window queue of TCP is blocked - > the sender continues to send - > the receiver loses - > the sender retransmits - > the network becomes bad Solution: the receiver tells the sen ...

I. Linux version 2. Copy and paste multiple jdks, as follows cp -R jdk1.7.0_80/ jdk1.7.0_80-2 cp -R jdk1.7.0_80/ jdk1.7.0_80-3 3. Configure multiple JDK environment variables Add the following after the / etc/profile file # JDK1 environment configuration export JAVA_HOME=/usr/local/program/jdk1.7.0_80 export JRE_HOME=$JAVA_HOME/jre export ...