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Share your own linux backup script (webdata + mysql) the function is used with crontab to automatically back up the website directory and mysql local copy ftp copy mailbox copy local and ftp automatically delete 3 days ago linux requires sendmail

The scheduled reboot of EmbeddedLinux under the friendly ARM Micro2440 recently used timed restart for the ARM server in the internship company, so I checked the relevant information today. I found that there was no specific method for my current

Vi (vim) is a commonly used editor on Linux. by default, vi (vim) is installed in many Linux distributions ). There are many vi (vim) commands, but if they are used flexibly, the efficiency will be greatly improved. Vi is the abbreviation of

Linux learning a & mdash; vnc Remote learning vnc installation Shell code [root @ SC-026 ~] # Yuminstallvncwww.2cto. comvnc remote connection first, log on to the remote machine through ssh, use the command vncserver to open a port for the current

Completely solve the problem of insufficient TCP client ports [problem] when making large concurrent performance calls at www.2cto.com, we often encounter a problem: the client port is exhausted. [Cause] after analysis, the main cause is that there

This article describes how to use iptables to create NAT in linux. we can use it as a gateway so that multiple machines in the Lan can use a public IP address to connect to the Internet. the method I use is to override the source address and target

Destination NAT changes the destination IP address of the data packet. when a data packet from the Internet accesses the public IP address of the network interface of the NAT server, the NAT server converts the destination address of these packets

About iptables firewall configuration in linux, the relationship between Iptables and netfilter modules in the firewall in linux is not a service, but a module loaded into the kernel. This module is the netfilter module. We use iptables to manage

Read [-ers] [-ufd] [-ttimeout] [-aaname] [-pprompt] [-nnchars] [-ddelim] [name...] Onelineisreadfromthestandardinput, bytes-u Read [-ers] [-u fd] [-t timeout] [-a aname] [-p prompt] [-nnchars] [-d delim] [name...] One line is read from the standard

On the eth0 server, the external address eth0: 192.168.1.223eth1 is set to the internal address eth1: 11920.2.1. the function to be implemented now is to limit the entire exit to 512 kbit (upload traffic ), download traffic of the 192.168.2 network

1. use shell to compress and decompress File 1. compression: tarcvfztarget file source file 1[source file 2..w.tarcvfzm.tar.gz hello. cpphello. h // m.tar.gz is the target document, hello. cpp and hello. h is source document 2. decompress:

Iptables-F # Allow packets to enter iptables-AINPUT-ptcp from port 22? Dport22-jACCEPT # The packet that allows access from port 22 returns iptables-AOUTPUT-ptcp? Sport22-mstate? StateESTABLISHED-jACCEPTiptables-AOUTPUT-pudp? Dport5 Iptables-F #

I. iptables command format (more complex) iptables [-ttable] command [chain] [rules] [-jtarget] (1) table ------- specify the table name (raw table, mangle table, nat table, filter table) (2) command ------- chain Operation command (-: append rules (

In linux, iptables proxy is used for Internet access. 1. Gateway/proxy server (proxyserver) iptables: the firewall software iptables in linux has two features: 1, firwall2, nat address translation rpm-qa |

Raid is a tool installed by default using raidtools. add hard disk raid members as hard disk partitions first to hard disk partitions 2. install raidtools3. process modification script raidstop/dev/md0cp/usr/share/doc/raidtools-1.00.3/raid1.conf.

1. after adding a new hard disk, you can use fdisk-l to view and confirm the new hard disk. In linux, device files are stored in/dev: 1) IDE hard disk is represented as hd, SCSI is represented as sd, 2) The first block is represented as. The second

In vi/vim, you can use the: s command to replace the string. : S/vivian/sky/replace the first vivian in the current row with sky: s/vivian/sky/g, replace all vivian in the current row with sky: n, $ s/vivian/sky/replace the first vivian from row n

Note: System: debian6.0.4IP address: 192.168.21.166 subnet mask: 255.255.255.0 Gateway: 192.168.21.2DNS: 8.8.8.88.8.4.4 operation: System O & M reminder: qihang01 original content copyright, reprinted, please indicate the source and original article

[Notes about swap] 1. swap is generally referred to as a "swap space" and serves as a "virtual memory" on Windows ". 2. swap is actually a space on the hard disk. 3. the data stored in the swap cannot be directly used by the CPU. If the CPU wants to

Because many configuration files have been renamed, such as/boot/grub. conf seems to have changed to/boot/grub. although cfg is relatively small, it may affect compatibility. Most linux and unix use. conf to change the configuration file name to.