Linux

Set the firewall to open port 80-a input-m state -- state NEW-m tcp-p tcp -- dport 80-j ACCEPT. Although it cannot be understood, it is used to open port 80. The online tutorial is very difficult. manual input is always incorrect. It will be used

  File permissions in linux are usually displayed in the following format: Chmod File Permission: permission management chmod     -A all permissions-u file owner permissions-g group permissions-o Other User Permissions   You can use the operator

1. Check the number of physical CPUs cat/proc/cupinfo | grep 'physical id' | sort | uniq | wc-l2, view the number of physical cores of a cpu cat/proc/cupinfo | grep' core id' | sort | uniq-c | wc-l or cat/proc/cupinfo | grep 'cpu cores' | uniq | awk-

[Root @ localhost ~] # Yum install gcc-c ++ autoconf automake [Root @ localhost ~] # Wget http://download.oray.com/peanuthull/phddns-2.0.2.16556.tar.gz [Root @ localhost ~] # Tar zxvf phddns-2.0.2.16556.tar.gz (/Etc/phlinux.

Rename window title Recently, I want to name an identifier for each window in the screen session, instead of the default $ bash Related commands: ctrl + z (my screen configuration + z, + a by default) + Final

1. Local and Internet resolution?? We have discussed forward and reverse DNS resolution before, but sometimes we want the DNS server to parse the local server differently from the Internet. You need to configure the local machine and the Internet in

DirectoryI. IntroductionIi. InstallationRPM InstallationCompile and installInstall dependency packagesInstall pcreCompileIii. VCL Execution Process4. Log OptimizationV. Server Load balancerVi. Elegant mode and holy ModeGrace modeSaint modeVII.

Overview: HAProxy provides high availability, Server Load balancer, and proxy Based on TCP and HTTP applications. It supports Virtual Hosts and is a free, fast, and reliable solution. HAProxy is especially suitable for websites with extremely high

In tianchao, website access is not smooth enough for several days every month, you know. Although Google Translate can be used to handle the issue, it is not 100% valid. For example, I encountered a problem when I recently accessed wireshark.org.

During work and production, my colleagues set up the LNMP environment. However, many php and nginx modules were not installed during the installation process. If you reinstall them all, the server may be unstable, therefore, only modules that are

During the project, the IP address of the host is changed every time the server is restarted because the company's LAN uses the automatic IP address acquisition method. To solve this problem, I set static IP addresses in CentOS to solve the problem

Recently, I want to monitor ATS. Using the stats_over_http.so module, I can use the url to view the ats status. In cacti, I added several values to monitor ATS, including:Proxy. process. http. completed_requests Cacti uses the stats_over_http.so

The error tolerance of Sqoop itself depends on Hadoop. Here we focus on the processing of Sqoop transmission task failure. Specifically, how does the focus solve the data consistency problem caused by the failure of the transmission task in

Apache Maven is a software (especially Java software) project management and automatic building tool provided by the Apache Software Foundation. Based on the concept of the project Object Model (POM), Maven uses a central information segment to

1. Early Stage: Prepare the node, install the operating system, configure the host name, configure the ip addresses of each machine, configure the hosts file, configure ssh password-less mutual access, configure Intranet time synchronization, and

Tomcat is a core project in the Jakarta project of the Apache Software Foundation. It is developed by Apache, Sun, and other companies and individuals. With Sun's participation and support, the latest Servlet and JSP specifications can always be

After multiple clients initiate concurrent append operations on the same file, only the client that was last initiated obtains the append lock. Other clients report the following error: At org. apache. Hadoop. hdfs. server. namenode. FSNamesystem.

In the previous article, I briefly learned about the official HA solution sentinel (SEE) provided by apsaradb for redis. The trial found that it was good, but it has not been merged into the stable branch, therefore, we do not dare to use it in the

Integrate and use Nagios and NConf 1. Introduction to nagios and nconf 31. About nagios 32. Introduction to nconf 3Ii. experiment environment 31. Install mysql 32. install apache 43. install php 44. configure the firewall and selinux 4Iii. Nagios

Idea: The svn server hook triggers the rsync synchronization script to synchronize the rsync defined modules on the web server. ======================================= WEB Server (RSYNC) ======================================Step 1: Install rsyncYum-