Linux Learning Notes (33) iptables Backup, Firewalld

I. Saving and backing up iptables rulesService Iptables Save//rules will be saved to/etc/sysconfig/iptables iptables-save > My.ipt//iptables rules back to My.ipt file iptabl Es-restore Second, FIREWALLDOpen FirewalldSystemctl Disable

Linux Common commands Brief--pwd

First, IntroductionThe PWD command is used to view the current working directory. The PWD command is also the shell's built-in command. Syntax: pwd [options]Second, common options-P: Shows the actual path (physical path);-L: Shows the link path

Linux log File Explorer--logrotate

1, Logrotate IntroductionLog files contain useful information about the events that occur in the system, which are often used during troubleshooting or during system performance analysis. For busy servers, the log file size grows extremely fast and

Single-user, rescue mode, clone virtual machine, Linux interconnection

If we forget the root password, we can change the password in the following waysSingle-user mode retrieve passwordFirst, we'll restart the server.The virtual machine needs to restart the power, the physical machine normal restart is goodVirtual

Linux Operations Learning notes-soft and hard links knowledge Summary

File linkHard links, linking through index nodesHard link schematic diagramHard-Link creation:Simply execute the command "ln source file Hard link file" to complete the hard link creation.Hard Link Knowledge Summary:1. Multiple files with the same

Linux Daily notes 5

First, build lamp platform1. What is lampWeb site: One and more pages are composed ofLanguages for writing websites:PHP, Python, Perl, Java,. Net ...Database:Oracle, MySQL, SQL Server ...Web server:Apache, Nginx, IIS ...Operating system:Linux,

Linux Learning Notes (30) daily operation and Maintenance II

One, Iostat, freeIostat-x disk usageRRQM/S: The number of read operations per second for the merge. Delta (rmerge)/sWRQM/S: The number of write operations per second for the merge. Delta (wmerge)/sR/S: Number of Read I/O devices completed per second.

10.6-10.10 Monitoring IO Performance free Command PS Command View Network Linux under Grab Bag

seven weeks two sessions (March 20)10.6 Monitoring IO Performance10.7 Free Command10.8 PS Command10.9 Viewing network status10.10 Linux under Grab bag Extended TCP three-time handshake four times wave http://www.doc88.com/p-9913773324388.htmlTshark

Linux exact find--find command

The Find command is an exact find tool that can find the exact location of a file, which is much slower than the fuzzy lookup of the Locate command.Find-search for files in a directory hierarchyFind [path ...] [Expression]Path: Refers to the file

Linux basic Commands (ii)

1) grep text filterSyntax: grep [options] mode or keyword file list--clolor color display matches to the keyword-I ignores case-V Take reverse^ Start with a keyword$ ends with a keyword^$ Empty LineThe number of rows to which the-C statistic matches-

How to monitor and troubleshoot Linux servers with Sysdig

If you need to track the system calls that a process makes and receives, the first thing to think about is what? You probably think of strace, you're right. Monitor raw network traffic from the command line what tools do you use? If you think of

Linux Scheduled Task process management

Crond is a command that Linux uses to execute programs on a regular basis. This task dispatch command is started by default when the operating system is installed. The Crond command periodically checks to see if there is any work to be done and the

(turn) detailed SSH remote access control in Linux

Detailed SSH remote access control in LinuxOriginal: http://blog.51cto.com/dengqi/1260038SSH: is a secure channel protocol, mainly used to realize the character interface of remote login, and other functions (using TCP port number 22nd). The SSH

Familiarity with Linux commands

CD command: Switch directories(1) Switch to directory/usr/localCd/usr/local(2) Go to the current upper directoryCd..(3) Go back to your home folderCD ~ls command: View files and directories(4) View directory/usr for all filesLs/usrmkdir command:

Familiar with common Linux operations

CD command: Switch directories(1) Switch to directory/usr/localCd/usr/local(2) Go to the current upper directoryCd..(3) Go back to your home folderCD ~ls command: View files and directories(4) View directory/usr for all filesLs/usrmkdir command:

Familiar with common Linux operations

CD command: Switch directories(1) Switch to directory/usr/localCd/usr/local(2) Go to the current upper directoryCd..(3) Go back to your home folderCD ~ls command: View files and directories(4) View directory/usr for all filesCd/usrLs-al ~mkdir

Familiar with common Linux operations

Please follow the Linux basic commands as required on the machine.CD command: Switch directories(1) Switch to directory/usr/localCd/usr/local(2) Go to the current upper directoryCd..(3) Go back to your home folderCD ~ls command: View files and

Familiar with common Linux operations

Please follow the Linux basic commands as required on the machine.CD command: Switch directories(1) Switch to directory/usr/localCd/usr/local(2) Go to the current upper directoryCd.. C(3) Go back to your home folderCdls command: View files and

Installation and configuration of VMware and Linux systems

first, the installation and configuration of virtual machines1. Installation of VMwareDownload vmware-workstation-full-12.5.0-435239 Install the package, open the installation package and keep the next step until the installation is complete.2, the

Summary of Linux commands and shortcut keys

Log in to the Linux system after entering the password, you want to delete ctrl+u Delete all the input before, (is uppercase U)IP a view IP (full ifconfig addr)Systemctl Restart Networkmanager.service Start commandDhclient dynamic acquisition of IP

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