Linux

Why is there interprocess communication? We should all know that the process is a program execution, is the system resource allocation of the smallest unit. The process described here generally refers to the process running in the user state, and

First, the introduction of rsync Rsync is a data mirroring Backup tool under the Linux system that enables you to back up local system data over the network to any remote host, and Rsync has the following characteristics: Can be mirrored to save

The problem of Vanilla kernel Linux kernel cannot be preempted in spinlock, IRQ contexts, so the time that a high-priority task wakes up to execution cannot be completely determined. Also, the Linux kernel itself does not handle priority inversion.

One, POSIX definitions of both reentrant and thread-safe concepts: Reentrant Function:a Function whose effect when called by two or over threads,is to as if The threads each executed the function one over another in a undefined order, even if the

Document management and the common commands detailed Linux file system is a basic inverted tree structure, we have to further study the file or directory operation and management commands: Directory-related operations: CDs, PWD, mkdir,

Method one, conventional way Using a template may cause the virtual machine to have insufficient hard disk capacity and can be stored as data by adding a single hard disk.1. First use the DD command to create an image file size 10G under the

You can view the status of a file through the stat command You can see that the file's access time, modification time, and change time are 13:36:55. This is also the time when the file was created, because no access, modification,

Adding ipp2p modules on the iptables requires: iptables≥1.4.3, kernel ≥2.6.29.When compiling ipp2p this extension I was CentOS 2.6.32-573.3.1.el6.centos.plus.x86_64 this kernel pit, which was installed when Yum update The last thing I had to do was

The new features given by the authorities are as follows: PHP 7.0.0 comes with new version of the Zend Engine with features such as (incomplete list):Improved performance:php 7 is up to twice as fast as PHP 5.6Consistent 64-bit SupportMany fatal

Install iptables Firewall If you do not install iptables you need to install first, CentOS execution: Yum Install Iptables Debian/ubuntu Execution: Apt-get Install Iptables On the VPS on the week nine Iptables set to: *nat:P rerouting ACCEPT [7

-A Hardware/kernel bits (AMD64, opterons)-at least 8GB of RAM-A recent Linux kernel (2.6.x) About tuning, I prefer to not fully disclose them because servers are targets of many attacks, so it's better not help HAC Kers. The most touchy thing is

With the expansion of Linux enterprise applications, there are a large number of network servers using the Linux operating system. Linux server security can be more and more attention, here according to the depth of the attack on the Linux server in

1. If it is a dual system, the code is mounted on the local disk, and the database device is mounted on the array by default, Sybase code is installed under/opt/sybase-12.5 In the/OPT directory, create the sybase-12.5 directory #mkdir sybase-12.5

This article first examines the IBM db2®universal database™ data partitioning feature in the DB2 UDB for linux®, UNIX®, and Windows® in the performance and scalability side The advantages of the face. Then, complete the steps to install and

This article takes red Hat Enterprise Linux as v4 as the platform I. Data reference and Preparation: DNS refers to: domain Name server. In the Internet domain name and IP address is one by one corresponding, although the domain name is convenient

Departmental machine upgrades, the elimination of a number of older machines, including the Ultra series of SPARC models, 64M memory, 2.1G hard disk, Solaris 9 has indicated that it does not support 64m memory, installed Solaris 8 and really lazy to

Introduction of DNS System 1.) The role of the DNS system is to maintain a host domain name and IP address of the corresponding relational database, when necessary for client network program to provide address resolution function Forward

Here's another way to communicate between processes, using shared memory. One, what is shared memory As the name implies, shared memory allows two unrelated processes to access the same logical memory. Shared memory is a very efficient way to

Signal is a very important part of Linux programming, this article will detail the basic concept of signal mechanism, the approximate realization method of Linux to signal mechanism, how to use signal, and several system calls about signal.Signal

1. About Sysstat;Sysstat is a software package that includes a set of tools to monitor system performance and efficiency. These tools collect system performance data for us, such as CPU usage, hard disk and network throughput data, the collection