Linux

1 for students who just use Linux, the most painful thing is to use the root user to execute some commands, but do not know the root password 2 I'll just explain how to change the password for a normal user and root user 1 Change the password for

Array sync in Md_do_sync, so where is the entrance? Where is the array sync trigger point? I've heard of Md_check_recovery, but this is not a synchronized entry point. So the RAID5D function is the entry point, right? If you want to seriously

1 Fdisk Partitioning tool 1 FSIDK is a partitioning tool from IBM that supports most operating systems, and almost all Linux is equipped with FDISK 2 Fdisk is a partitioning tool that supports MBR, and we can't use Fdisk to partition if we want to

Description Single NIC binding two IP addresses, telecommunications and Unicom, the purpose: to be used when the telecom out of fault unicom normal use. System IP Address Subnet mask Gateway CentOS 6.3_64bit

As we all know, Linux provides a powerful server function, but the server is very high on the link requirements, at least require 7*24 is connected. But once our server network card problem, or link problem, in this case, the server will not be

DHCP Server build Environment redhat.enterprise.linux.5.8 Dhcp-3.0.5-31.el5 Content: Introduction to DHCP Services DHCP service configuration file DHCP service case 1. Introduction to DHCP Service How DHCP works: The

First, let's look at the virtual memory: First Level understanding 1. Each process has its own independent 4G memory space, the memory space of each process has a similar structure 2. When a new process is established, it will establish its own

File type File types are viewed through file Locate Query files based on the pre-built file database on the system -the database must be updated by the administrator -Search out the absolute path of the file, not just the filename may only

startup process for Linux machines: Post (BIOS)---> MBR boot---> GRUB menu---> Load kernel (kernel)---> Running the init process The whole process can be divided into two main processes: MBR boot and Grub First stage expiration: The NBR boot

LVM (Logical Disk Management) Introduction of LVM LVM is a shorthand for Logical Volume Manager (Logical Volume management), which is implemented by Heinz Mauelshagen on the Linux 2.4 kernel. LVM sets the partitions of one or more hard disks

People who have installed Linux know that in only one machine for the installation of Linux, it is easy, we just need to put the optical drive into the can, step-by-step installation on the ok! But when we are in a computer room, multiple machines

What is a process? A process is a set of instructions that is loaded into memory Process id,pid number is used to mark individual processes UID, GID-related permissions and selinux determine access to and access to file systems Typically

Don't repeat the invention of the wheel One of the core ideas of open source culture is not to reinvent the wheel, many open source software is the combination of existing software, code and functionality, just as with parts assembly machines,

Permissions Permissions are the mechanisms used by the operating system to restrict access to resources, and permissions are generally divided into read, write, and execute. Each file in the system has specific permissions, the user and the group

Users, Groups When we use Linux, we need to run as a user, limiting which resources the user or process can use, or not. Groups to facilitate organization and management of users Each user has a userid, the operating system is actually using the

In the HTTPD service's access log file Access_log, a large number of client access information is logged, and by analyzing this information, the Web site's access can be understood in a timely manner. For experienced administrators, you can write

1. How to set up the system to start directly into the character working mode, the system provides multiple virtual consoles, the default 6, using ALT+F1 to ALT+F6 switch, the graphical interface can press CTRL+ALT+F1 to CTRL+ALT+F6 switch to the

Processes are designed to enable multiple programs to execute concurrently, increasing resource utilization and throughput of the system Each process in 1.linux has a recognition number PID 2. The first boot process of the system is init,pid 1,

SNAT, Dnat objective function The Ip_nat_rule_find () called in the IP_NAT_FN () function is used to find the NAT rules, perform the action of the rules, and the rule target is either Snat or Dnat, which is specifically implemented in

The main problem is that I need to write a dynamic extension library for PHP, and when I'm done with the porting, Phpinfo shows: Reference Standard Dynamic Library Support Not available In this case, I write the dynamic link library can not load.