Cloud Applications

1. Linux basic installation Linux operating system Linux file system Linux common commands Linux startup process detailed explanation familiar with Linux services able to install Linux operating system independently able to skillfully use basic

Rsync hardening technology (when firewall is enabled by manually modifying the port) and synchronizing only the desired server through the script Client: 192.168.0.22, 192.168.0.20 Server: 192.168.0.21 (source) is used to synchronize with other

With your experience in Dos and Windows, you probably know that there are several types of files in the system, such as system files, read-only files, and hidden files. Use ls in Linux? L command to determine the file type, which can be determined

1) Check the current zombie process information # ps-ef | grepdefunct | grep-vgrep | wc-l175 # top | head-2top-15: 05: 54up97days, 4 users, loadaverage: 0.66, 0.45, 0.39 Tasks: 829 total, 1 1) Check the current zombie process information # Ps-ef |

Adjust the usage of a program corresponding to the CPU: 1. use taskset to fully utilize the multi-core cpu and balance the cpu usage to each cpu # taskset-p and set an existing pid, instead of restarting a new task-c, you can specify multiple

Recently I installed CentOS6.0 and found that the ext4 file system was added to the 6.0 system. to learn about the features of the ext4 file system, I searched the internet. compared with the previous ext3, the ext2 function is much richer. the

CentOS is the product of source code re-compilation of RHEL (RedHatEnterpriseLinux), and many known bugs have been fixed on the basis of RHEL. compared with other Linux releases, CentOS has reliable stability. During system maintenance, you may need

We all know that initrd is a memory file system started in linux. what is in it? Today, let's take a look at how to open this file system! Initrd = initramdisk is a file system that exists in the memory at startup. Initrd was initially designed to

Abstract: The first step to optimize website SEO is to make Spider crawlers come to your website frequently. the following Linux commands can clearly show you the crawling status of spider. The following is an analysis of the nginx server. The

CentOS uses vim/vi to encrypt and decrypt files. 1. use vim/vi to encrypt files. Advantages: After encryption, if you do not know the password, you cannot see the plaintext, including root users; disadvantages: clearly let others know about

We plan to record the process of configuring a series of servers under Centos. Here, we start from CentOS6.3 configuring the local yum source. As we have introduced a lot of blog posts about local YUM sources before, we may just give a brief

In response to the company's internal website rating requirements, system security protection is gradually being strengthened. By default, the device automatically exits after three Verification failures and ends the session. The network logon

[Overview] domain name server (DomainNameServer ). Domain names and IP addresses on the Internet correspond one by one. Although domain names are easy to remember, machines can only know each other's IP addresses. the conversion between them is

When we deploy LAMP, we usually install the httpd service and use the httpd. replace the default httpd with conf. conf may encounter some uncompiled modules when the httpd service is restarted. The first reaction is to re-compile the modules, but

Mkinitrd (makeinitialramdiskimages) function description: creates an image file to load ramdisk. Syntax: mkinitrd [-fv] [-- omit-scsi-modules] [-- version] [-- preload = & lt; Module Name & gt;] [-- with = & lt; module Name & gt;] [image file]

Command: e2fsck permission: Super User usage: e2fsck [-pacnydfvFV] [-bsuperblock] [-Bblocksize] [-l |-Lbad_blocks_file] [-Cfd] device description: check whether the partition of the Linuxext2 file system works properly. parameter: device: Hard disk

User Management user permission 1) restrict the password policy echo & quot; Passwordsexpireevery180days & quot; perl-npe & #39; s/PASS_MAX_DAYS \ s + 99999/pass_max_days-1/& amp; #39;-I/etc/l user management User permissions 1) restrict root

More: The more command is similar to cat. the cat command displays the content of the entire file on the screen from top to bottom. More will display one page at a time to facilitate users to read one page at a time. the most basic instruction is to

Tail name: tail-outputthelastpartoffiles function description of the last part of the output file: The tail command writes the file to the standard output from a specified point, you can use the-f option to conveniently view the changing log files,

Wc [wordcount] name wc-printthenumberofnewlines, words, andbytes (wordcount) infiles syntax wc [option] files function brief statistics on the number of characters in the number of bytes in a specified file. If no file is specified, enter wc [word