Linux

Long time useless I/O multiplexing, feel almost forgotten, I remember just learned I/O reuse time spent a lot of times, but because that will not love to write blog, resulting in spending a lot of time to understand things, still easy to forget. As

1. Install disc (folder does not exist, create)Mount-t Auto/dev/cdrom/mnt/cdrom2. Change index file, specify read local fileVi/etc/yum.repos.d/centos-media.repoFor node BaseURL add file:///mnt/cdrom/3. Install with yum (install OpenSSL 32-bit

The top command is a common performance analysis tool under Linux that shows the resource usage of individual processes in the system in real time, similar to the Task Manager for Windows. Top is a dynamic display process where the current state can

SortThe sort command sorts the rows in the files specified by the file parameter and writes the results to standard output. If the file parameter specifies multiple files, the sort command connects the files and sorts them as a file.Sort

Function prototypeskey_t Ftok (const char *pathname, int proj_id); #pathname: Specifies the file name, the file must be present and can be accessed #proj_id: sub-sequence number, only 8 bits are used (0-255) #当成功执行时, Returns a key_t value that fails

1) Download jdk-6u45-linux-x64.bin.tar.**2) put it in a directory and unzip it.3) Execute the following commandchmod +x Jdk-6u45-linux-x64.bin./jdk-6u45-linux-x64.binMkdir-p/USR/LIB/JVMMV JDK1.6.0_45/USR/LIB/JVMUpdate-alternatives--install "/usr/bin/

Linux hint no crontab for root solution Uploaded by: yuyan3081 I also want to " share the Money" 2014/6/19 attention ( 2004)

Written in front: do a half-yearly graduation design, find the work with this completely unrelated, found themselves now have to write not reconciled, but I still pay attention to this aspect of development, their own groping and help me to complete

2015/07/24 today the main use of this command to download software for the server. 2015/07/27 First Use the Wget-p directory to save the downloaded software to the specified directory, but always fail. For example, a. Software download succeeded

Nginx Load Balancer cluster configuration[Email protected] ~]# cd/usr/local/nginx/conf/vhosts/[[email protected] vhosts]# lsDefault.conf test.conf[Email protected] vhosts]# vim lb.confUpstream Wang {Server 192.168.137.21:80;Server 192.168.137.23:80;}

Linux operations-aware performance monitoring and debugging tools1 NagiosNagios is an open source monitoring solution, and I think he can monitor everything, and can look at my previous article: NAGIOS2 PS #用来查看程序的运行情况Ps-ef |grep svr.py|grep-v grep |

Http://blog.chinaunix.net/uid-25120309-id-3801250.htmlI. AWK descriptionAwk is a programming language that is used to process text and data under Linux/unix. Data can come from standard input, one or more files, or the output of other commands. It

In Linux, check the folder size, disk space remaining (du/df), and dudf.1. Introduction View the directory size in du, and view the disk usage in df.2. du Disk usage(1) Basic functions Recursively view the size of all files in a folder(2) common

Linux Study Notes 1, linux Study Notes Since my big Microsoft finally put it down, I decided to give the open-source community a late hug. The fans who have followed me for many years suddenly got the favor of the goddess. They were all lost, crying,

Let Git output multiple colors and custom log formatsGit multi-color output Git outputs a single color by default, which is not only beautiful but not easy to read. In fact, Git itself supports multiple colors to display its output information. You

Linxu command and file search-which, whereis, locate, find Linxu command and file search-which, whereis, locate, findWhich 』) [Root @ www ~] # Which [-a] command option or parameter:-a: List all commands that can be found in the PATH directory, not

Solve the Problem of black screen on Ubuntu and black screen on ubuntu. Virtual Box + Ubuntu 64bit can be used well before, but when it was opened yesterday, a selection interface (which of the following recovery modes is available) was black, and

CentOS system optimization "Modify time zone and time" There are several concepts related to time settings:1. rtc time/hardware time: for example, a real-time clock (rtc) hardware device on the motherboard. This time does not contain time zone

Analysis and Solution of the reason why the Spark cluster cannot be stopped Today I want to stop the spark cluster and find that the spark-related processes cannot stop when the stop-all.sh is executed. Tip: No org. apache. spark. deploy. master.

Install and configure Hadoop in Linux Before installing Hadoop on Linux, you need to install two programs: JDK 1.6 or later; We recommend that you install OpenSSH for SSH (Secure Shell protocol ). The following describes the reasons for