Cloud Applications

Unix learning method-master path for some people who want to learn linux and are learning linux systems, they hope to become linux or even unix masters. I have been working on unix for many years, I would like to introduce my experience. There are

I. Install # sudoapt-getinstalltcpdump 2. Error during tcpdump running: 1. tcpdump: nosuitabledevicefound error 1. this error does not use the root permission to run this command. 2. by default, only four tcpdump instances can be used at the same

In the past, the company's FTP was on the public network, and it was not a big problem to use it. now I feel that a gateway may be safer, so I put the FTP in the intranet, therefore, port forwarding must be performed on the Gateway. I configured 21

It uses tcpdump many times. Seems to use only one format of tcpdump-v-x-n-ieth0hostx.x.x.x, add more options will syntaxerror,, hehe first is about the type of keywords, mainly including host, net, port, such as host210.27.48.2, specify 210.27.48.2

[Root @ tp ~] # Iptables-L-nChainINPUT (policyACCEPT) targetprotoptsourcedestinationChainFORWARD (policyACCEPT) targetprotoptsourcedestinationChainOUTPUT (policyACCEPT) ta [Root @ tp ~] #Iptables-L-nChain INPUT (policy ACCEPT)Target prot optsource

Preface using Linux + iptables as a firewall has high flexibility and stability (dude, my firewall has never been restarted since it was done), but it is troublesome to install and set it, this article aims to use firewall instances for the company

Iptables command: 1. (-N) create a new rule table 2. (-X) delete an empty Rule Table 3. (-P) change the default policy of the built-in rule table. 4. (-L) list rules in the rule table 5. (-F) clear the rules in the rule table. 6. (-Z) clear the rule

The command to disable the firewall in Linux. today, I want to take a break from the ssh remote connection port on the LInux server for security purposes, I added a line of port8081 to the sshd_config file, but after the configuration is completed

PS: tcpdump is a tool used to intercept network groups and output group content. it is simply a packet capture tool. Tcpdump is the preferred tool for network analysis and troubleshooting in Linux based on its powerful functions and flexible

The following is only the installation record 1. create lv [root @ Linux ~] # Lvcreate-L20480VolGroup_ID_25519-nlvdbraLogicalvolumelvdbracreated2, create mount point [root @ Linux ~] # Mkdir/dbra3. if the file is directly mounted or mounted in ext3

HP-UX (HP-UX tutorial), all known as HewlettPackardUniX, is the operating system of HP 9000 Series servers that can run on HP's HP-UX11iv3 third-time upgrade PA-RISC processor, Intel's Itanium processor computer. It is based on SystemV and is a

I. preface every Linux user will encounter this dilemma when installing Linux: how to accurately evaluate and allocate the capacity of each hard disk partition when partitioning the system, because the system administrator should not only consider

LVM: logicalvolumemanager (Logical Disk Management). lvm shields the underlying disk layout and facilitates dynamic disk capacity adjustment. Step 1, use the fdisk tool to convert a disk to partition 2 in linux, use the pvcreate command to convert a

This article describes some of the useful and commonly used commands. if you are familiar with these commands, you will find it quite comfortable to edit files. note: In the following example, xxx indicates entering xxx in command mode and press

Sudoapt-getupdata and then install sudoapt-getinstallvim-full. enter gedit ~ in the terminal ~ /. Vimrc copies the 1 file and saves it in the terminal. enter gedit ~ /. Gvimrc copy the 2 file to it and save it. Close the terminal and restart the

Functions of the text editor: 1. create or modify a text file 2. maintain the classification of various configuration file text editors in linux: line editor and full screen editor, character interface editor and graphical interface editor the most

You can also configure the shared directories of NFS and SMB through 'fstab. Because the options involved are very important and you need to understand the work of some protocols, you must first read Samba and NFS. There are not many differences

If you want to enable automatic mount, you can add the following lines to/etc/fstab:/dev/hda5/mnt/dvfatexec, dev, suid, rw, umask0, iocharsetgb2312 and codepage93600 also solve the problem of garbled characters in Chinese file names. my fstab file

To create a logical volume, run the vgscan command (run on all RAC nodes in the cluster) to create the/etc/lvmtab file. Use pvcreate to create a physical volume used by the Logical Volume Manager (LVM. Use vgcreate as the drive or for the RAW device

This article describes 25 common iptables usage. If you do not know much about iptables, refer to the previous iptables detailed tutorial: This article describes 25 CommonIptablesUsage. If youIptablesFor more information, see the previous iptables