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Linux Virtual Server (LVS) 是 Linux 系统上的高性能四层负载均衡解决方案。LVS 由章文嵩于 1998 年开发，自 Linux 2.4 版本起成为 Linux 内核的一部分，通过 IP 负载均衡技术提供可扩展的网络服务。核心特性四层负载均衡：在传输层（TCP/UDP）工作内核级实现：高性能，开销极小多种工作模式：NAT、隧道和直接路由灵活的调度：多种负载分配算法高可用性：支持 keepalived 故障转移开源：免费且是 Linux 内核的一部分

eBPF（Extended Berkeley Packet Filter） 是一项革命性技术，它允许在 Linux 内核中安全、高效、可编程地执行沙盒程序，而无需开发内核模块或修改内核源代码。eBPF 使开发者能够动态扩展内核功能，提供前所未有的可观测性、安全性和网络功能，同时通过验证过程确保安全性。核心特性安全性：程序在执行前经过验证，确保不会导致内核崩溃高效性：通过 JIT（即时编译）编译为本地机器码，实现接近原生的性能可扩展性：可挂载到各种内核子系统，无需修改内核代码可移植性：通过 C

VirtualBox: CentOS7.5 install VBoxLinuxAdditions# yum install gcc# yum install gcc-c++// 版本要根据具体情况# yum install kernel-devel-3.10.0-862.el7.x86_64# reboot// 在桌面上打开增强功能包光盘，将VBoxLinuxAdditions....

端口进程相关Win10端口netstat -aon | findstr "端口号"进程根据进程号查看进程信息tasklist|findstr "15560"taskkill /pid 15560 /f成功: 已终止 PID 为 15560 的进程。Linux端口netstat -anl | grep "端口号"netstat -anp | grep 8282lso...

ProblemThere is a problem when user dijk execute command below:$ sudo usermod -aG vboxsf dijkor$ sudo gpasswd -a dijk vboxsfProblem: “dijk is not in the sudoers file. This incident will be rep...

ProblemProblem: MySQL: -bash: mysql: command not foundOn CentOS, MySQL works fine, but can not use “mysql” command in terminal, and says “-bash: mysql: command not found”.Solution# cd /usr/local/...

Problem[main] WARN bitronix.tm.Configuration - cannot get this JVM unique ID. Make sure it is configured and you only use ASCII characters. Will use IP address instead (unsafe for production usage!)...

CentOS 删除多余内核# 查看当前系统中的kernel# rpm -qa | grep kernel# 删除不需要的kernel[kernel devel...]# yum remove kernel-...# 安装需要的内核# yum install kernel-......

ProblemWARNING [main] org.apache.catalina.util.SessionIdGeneratorBase.createSecureRandom Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [1,139,942] milliseconds.So...

MySQL: 数据库拒绝访问[远程连接]登录MySQL$ /usr/local/mysql/bin/mysql -u root -pmysql> user mysql;mysql> select host from user;mysql> update user set host ='%' where user ='root';mysql> exit;重...

查看log日志命令cat catalina.outortail -5000f catalina.out

MySQL: 设置表名不区分大小写vi修改/etc/my.cnf# vi /etc/my.cnf 在[mysqld]段后附加一句：lower_case_table_names=1如：[mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock lower_case_table_names=1重启MySQL...

MySQL 忘记root密码修改MySQL的登录设置# vi /etc/my.cnf 在[mysqld]段后附加一句：skip-grant-tables如：[mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock skip-grant-tables 重启MySQL登录并修改MySQL的root密码# ...

MySQL: ERROR 1044 (42000)现象mysql> use mysql;ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'mysql'如果使用“mysql -uroot -p”登陆会报错，即使密码正确也不能登录，而且发现，直接用“mysql -uroot”不输入密码也可以登...

SecureCRT 压缩打包、下载、上传命令压缩打包tar -czvf 压缩后文件名.tar.gz(含路径) 要压缩的文件名(含路径)如 tar -czvf xxx.tar.gz xxx/ xxx1 xxx2 xxx3 多个待打包文件以空格分隔下载sz 压缩后文件名.tar.gz(含路径)上传rz 直接回车 -> 出现选择文件的弹窗...

查看linux系统版本信息（Oracle Linux、Centos Linux、Redhat Linux、Debian、Ubuntu）查看Linux系统版本的命令（3种方法）1、cat /etc/issue，此命令也适用于所有的Linux发行版[root@S-CentOS home]# cat /etc/issueCentOS release 6.5 (Final)Kernel \r o...

CentOS: 查看ip地址# ip addror# ifconfig

CentOS: install jdk1.8DownloadDecompress# mkdir /usr/local/java/// Decompress to '/usr/local/java/' directory# tar -zxvf jdk-8u151-linux-x64.tar.gz -C /usr/local/java/Environment variable# ...

修改指定目录下所有文件的权限// 修改指定目录下所有文件的权限为全体可读、可修改、可执行# chmod -R 777 apache-tomcat-8.5.20/

Command: disk space[root@abc ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/vda1 40G 2.2G 36G 6% /devtmpfs 1.9G 0 1.9G 0% /devtmpfs 1.9G 0 ...

Alpine: get system infolocalhost:~# cat /proc/versionLinux version 4.14.85-0-virt (buildozer@build-3-8-x86_64) (gcc version 6.4.0 (Alpine 6.4.0)) #1-Alpine SMP Tue Dec 4 17:35:30 UTC 2018localhost...

Problemapk add docker ERROR: unsatisfiable constraints:...Solution// update repositoriesvi /etc/apk/repositories#/media/cdrom/apkshttp://mirrors.tuna.tsinghua.edu.cn/alpine/v3.8/mainhttp://...

ProblemIs docker daemon running?Solution// start docker daemon# dockerd

Alpine install docker compose// seems there is a problem with Alpine 3.8.1 virtual, can not work!# apk add curl# curl -L "https://github.com/docker/compose/releases/download/1.23.2/docker-compose-...

Alpine change current shell// change current shell# vi /etc/passwd# change by dijkroot:x:0:0:root:/root:/bin/ash#root:x:0:0:root:/root:/bin/bash// see current shell# echo $0or# echo $SHELL...

Alpine: install zsh and oh-my-zsh# cat /etc/shells# valid login shells/bin/sh/bin/ash/bin/bash# apk add zsh# cat /etc/shells# valid login shells/bin/sh/bin/ash/bin/bash/bin/zsh// chang...

Linux: see file size command// see file size# ls -lht

VirtualBox Installing Alpine 3.8.1Install启动虚拟机，用光盘启动，然后用root登录AlpineLinux，没有密码敲入命令setup-alpine跟随命令行向导一步一步执行在选择安装源时，敲入“f”让系统自己寻找一个最快的源在选择安装目标盘时，敲入“sda”在选择分区类型时，敲入“sys”装完了，退出光盘，重启虚拟机Confi...

Alpine install dockerInstall docker// 安装docker，并使其服务端随系统启动# apk add docker# ln -s /etc/init.d/docker /etc/runlevels/default/dockerDocker mirror acceleration// Docker国内镜像加速# touch /etc/docker...

CentOS install git// install gityum –y install git

Alpine install SDKMAN!InstallInstalling SDKMAN! on UNIX-like platforms is as easy as ever. SDKMAN! installs smoothly on Mac OSX, Linux, Cygwin, Solaris and FreeBSD. We also support Bash and ZSH she...

Ubuntu设置root密码终端输入sudo passwd root，在[sudo] password for landry:后输入当前用户的密码当前用户密码验证通过后输入需要设置的root超级管理员账户密码Enter new UNIX password:验证输入的密码Retype new UNIX password:出现passwd: password updated succe...

About catcat stands for “catenate.” It reads data from files, and outputs their contents. It is the simplest way to display the contents of a file at the command line.Purposes to use cat command under

About netstatThe netstat command is used to print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships.ExamplesList All Ports (both listening and

About cutRemove or “cut out” sections of each line of a file or files.cut command Syntaxcut OPTION... [FILE]...cut command options-b, --bytes=LIST Select only the bytes specified in LIST.-c, --cha

About grepgrep prints lines of input matching a specified pattern.grep command Syntaxgrep [OPTIONS] PATTERN [FILE...]Descriptiongrep searches the named input FILEs (or standard input if no files are n

About sortSorts the lines in a text file.sort command Syntaxsort [OPTION]... [FILE]...sort command options-b, --ignore-leading-blanks Ignore leading blanks.-d, --dictionary-order Consider only b

About psReports a snapshot of the status of currently running processes.Syntaxps [options]DescriptionOn every UNIX-like operating system, the process status command (ps) displays information about act

Awk Introduction and Printing Operations:Awk is a programming language which allows easy manipulation of structured data and the generation of formatted reports. Awk stands for the names of its authors

About findfind searches for files in a directory hierarchy.find command Syntaxfind [-H] [-L] [-P] [-D debugopts] [-Olevel] [path...] [expression]ExamplesFirst, create the following sample empty files