Linux

Can be divided into 3 small questions: How to add a default gateway to liunx with the command line, assuming the gateway address is 10.0.0.254 192.168.1.0 network segment, 192.168.1.1 gateway a server wants to connect to the 172.16.1.0/24

Linux kernel parameter optimization 1. Move the VM,swappinessSet to0-102. Place the VM,dirty_background_ratioSet to5-10, move the VM,dirty_ratioSet it to the两倍To ensure that dirty data can be continuously flushed to磁盘, avoid instantI/OWrite,

The dynamic process of the system can be divided into:Post: Power-on and self-testBoot Sequence (BIOS): MBR is found based on the boot order in BisoBoot Loader (MBR): Start the bootloader bootstrapper in the MBRKernel (RAMDisk): Load kernel, load

One, the orderCommands that must be mastered:Man,touch,ls,mkdir,cp,rm,mv,echo,pwd,cat,alias,unalias,head,tail,tree,rmdirWant to get high-tech command to master: Find,xargs,awk,sed,grep,vi,vim,seqSecond, the Linux system to view the means of command

Compression and decompression of files under Linux Directory1. Compression2. Unzip3. Archiving ToolsOne. Compression Compress: -d：解压缩，相当于uncompres -c：结果输出至标准输出，不删除原文件 -v：显示详情-C (need and redirect >

? The numerical of permissions– Basic permissions: r = 4,w = 2,x = 1? Set permissions in numeric form–chmod [-r] NNN documentation ...–chmod [-r] xnnn documentation ...[Email protected] ~]# MKDIR/NSD01[Email protected] ~]# LS-LD/NSD01[Email

1.Vmstat is an abbreviation for virtual meomory Statistics (dummy memory statistics) that monitors the operating system's virtual memory, process, IO read-write, CPU activity, and so on. It is the overall situation of the system statistics, the

Linux has a complex system, there are a lot of commands, development colleagues in the daily development, unlike operations colleagues need to skillfully use a lot of commands.Below is a list of the basic commands I used in my work:Log viewFor

10.15 iptables Filter Table caseIptables Filter Table Small caseImplement release 21,80 port and IP segment request release port 22 for source IP belonging to 133.168.133.0:vi/usr/local/sbin/iptables.sh//Add the following:#! /bin/bashipt= "/usr/sbin/

Original: https://book.2cto.com/201304/19615.html Because the default Linux kernel parameters consider the most common scenario, which is clearly incompatible with the definition of a Web server to support high concurrent access, it is necessary to

Linux 7 RunLevel# 0-Stop (never set the Initdefault to 0)# 1-Single user mode# 2-Multi-user, but no NFS# 3-Full multi-user mode# 4-No use# 5-x11# 6-Reboot (never set Initdefault to 6)# A detailed explanation of each run level:0 for downtime, the

Under Linux system, reboot tomcat using command operationFirst, go to the bin directory under Tomcatcd /usr/local/tomcat/bin使用./shutdown.sh或者是sh shutdown.sh关闭TomcatUse./startup.sh or SH startup.sh to start tomcatTo see if Tomcat is shutting downps

Linux first week study notes (TEN) 1.15 Cloning a virtual machine (1) because in the future to do the experiment requires two machine interconnection, because in the virtual machine inside the system is slower so the use of cloning is relatively

Install the Tomcat startup times under Linux with the following error:Neither the Java_home nor the JRE_HOME environment variable is definedAt least one of these environment variable are needed to run this programCause: The JDK or JRE path could not

Ubuontu16.04 process and use find_package () error messages caused by installing Opencv library, ubuontu16.04opencv After installing the Opencv library, test whether the Opencv library is successfully installed. The following example shows the

Zssh, rz, and sz transmission between linux machines The full name of zssh is zmodem ssh. You can see the name and use zmodem. We are used to SecureCRT and can directly send files, which is much more convenient than scp. The convenience of zmodem

Linux Command sharing: Explanation of ss commands and explanation of ss commands Ss is short for SocketStatistics. As the name suggests, the ss command can be used to obtain socket statistics, which can display content similar to netstat. But the

Centos7-32 network configuration problem solution, centos7-32 Solution I just installed centos7 on a very old laptop (lenovo z61t). The system does not seem to have such an old wireless NIC driver, so the new system does not connect to the Internet,

Linux Command sharing: crontab command usage instructions, linuxcrontab The previous day, I learned the at command for a task that runs only once. The scheduled task is a routine task that runs cyclically. the linux system is controlled by the cron

Linux knowledge details, linux details4 Linux 1 Basic Linux commandsRestart command:1. reboot2. shutdown-r now restarts immediately (used by the root user)3. shutdown-r restarts automatically after 10 minutes (used by root users)4. shutdown-r