Cloud Applications

In Linux, colon (:) is commonly used as the PATH separator (PATH) and data field separator (/etc/passwd. In fact, the colon (:) is also a built-in command in Bash. it does not do anything. it is an empty command and only serves as a position, but

After installing the Linux system, modify the Swap partition size (two methods). after installing the Linux system, what should I do if the swap partition is too small? how can I expand the Swap partition? There are two ways to create a new swap

When the partition space of your system reaches 90% or more, you do not want to search one by one when you need to clean up a disk, you can use the following shell scripts to filter the largest mount point msg 'df-k | awk & amp; #39 ;{ print $6} &

Query who logged on to the system [root @ lyy ~] # Whoroottty12010-12-0919: 16 rootpts/02010-12-0919: 29 (192.168.197.1) first column login user second column terminal name third column login time query each user recent login time la... Query who

1. Introduction to Sed sed is an online editor that processes a row of content at a time. During processing, the currently processed rows are stored in the temporary buffer, called patternspace. then, the sed command is used to process the content

Recently, after learning cacti, the network card information cannot be monitored. the solution is as follows: edit/etc/snmp/snmpd under the linux host. conf file found: com2secnotconfiguserdefapublic public changed to: com2secnotConfigUserallpublic

Common logon files:/var/log/cron: records the running status of crontab and whether/etc/crontab is correct. /Var/log/dmesg: records the information generated during the core detection process when the system is started. /Var/log/lastlog: record the

I. DNS basics [DNS system (server) working principle and attack protection methodology] DNS: DomainNameSystem, domain name resolution server, its role on the internet is to convert a domain name into an IP address that can be recognized by the

During this time, I learned about the ubutun system. one feature of linux is that many operations can be processed through terminal commands. Once familiar with it, the processing efficiency is very high, but the skill and learning costs are

Today, as the customer needs it, we need to change the previous raid 5 to RAID0. In a simple environment, this is one of the storage devices of a vendor. the OS is of the linux version, with 12 2 tsata disks and LSI hard RAID. I made two of them

Redhat Enterprise 6 installation driver [root @ localhostDriver] # tar-xvzf./tg3-3.116j.tar.gztg3-3.116j/tg3-3.116j/makeflags. shtg3-3.116j/ChangeLogtg3-3.116j/Makefiletg3-3.116j/tg3_firmware Install drivers in Redhat Enterprise 6 [Root @ localhost

Ls & amp; ndash; la lists all command cd to enter the current directory cd .. parent directory cd. the current directory cat displays the file content echo + content & gt; file name (write content) mkdir creates a new directory mkdir & amp; ndash; p

Computer crashes, hard disks crash, and a huge amount of money is spent to create an emergency protector & hellip; this is the dark side of the computer. Do you accidentally delete your commemorative image? When installing a new system, delete

First, let's introduce the situation. server A and server B are both CentOS4.6 systems. now we need to create HACluster. to avoid split-brain attacks, we need to improve the reliability of the heartbeat link, which is the current connection

Squid performance analysis to obtain information status of squid execution 1, when you do not know what information can be queried./squidclient-h127.0.0.1-p80mgr: 2, GeneralRuntimeInformation, view the general status ../squidclient-h127.0.0.1-p80...

1: first download the corresponding software version from the official website. 2: install the required third-party library yum-yinstallgccgcc-c ++ autoconfmakelibjpeglibjpeg-devel \ libpnglibpng-develfreetypefreetype-develzlib \... 1: first

Replace command batch comments: Use the following command to add comments to the beginning of a specified line: Starting line number, ending line number s/^/annotator/g uncomment: Starting line number, end line number s/^ annotator/g example:

In linux, everything is a file. files provide a simple and unified interface for operating system services and devices, which means that programs can use various devices as they use files. In most cases, only open, write, lseek, read, and close

An error is reported when a sh is started in debian today, which leads to the formation of this article: when bashshell is used, we have the following scenario: env. sh -- define public variable run1.sh -- define run code run2.sh -- define run code

1. download and install mkdir-p/root/softcd/root/softwget-cftp: // your 1. download and install Mkdir-p/root/softCd/root/softFtp://ftp.samba.org/pub/rsync/rsync-3.0.8.tar.gz wget-cTar-zxvf rsync-3.0.8.tar.gzCd rsync-3.0.8./Configure -- prefix