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First, the preparation before installing heartbeat
1. Hardware required for heartbeat cluster
The hardware devices necessary to build a heartbeat cluster system are:
Node server
Networks and network adapters
Shared disks
(1) Node server
Installation of heartbeat requires at least two hosts, and the requirements of the host is not high, ordinary PC server c
Linux Server Erection Chapter (ii) – Source installation Web server Nginx
I. Introduction to the Environment:
Linux version: CentOS 7 64-bitNginx Version: nginx-1.9.5Nginx is a lightweight Web server, can do load balance
Entboost,version 2014.180 Linux version number is announced, mainly add enterprise IM application integration function, good Android SDK function and some bug fixes;7/1 (Tomorrow) Release the Windows version number, please pay attention!Entboost is a cross-platform, cross-application of real-time communication platform, Embu Network is committed to helping developers, software companies and enterprises to build enterprise-class Instant messaging platf
Sublime editor,. After downloading, unzip, extract the home directory, for the extracted folder in the executable file to add environment variables,Vim ~/.BASHRC Open the file that configures the environment variable, add export path= "~/sublime_text_3: $PATH" On the last line,In order for the modified environment variable configuration file to take effect, execute the source ~/.BASHRC, so that each time th
Two high available open source solutions: keepalived and Heartbeat. Both are very popular, but the difference is still very large, and now the trial process of the experience and related knowledge points simply summed up for everyone to choose the time of the reference.
1keepalived use simpler: From the installation, configuration, use, maintenance and other angles of comparison, keepalived are much simpler
the file, you do not need to declare the content again in the configuration file. This frame looks at the file name and makes clear the purpose of the file. Do not configure the file, write the program to be more comfortable.
3. Grails uses the open source framework of spring and hibernate, which means that what we have learned in the past will not be in vain.
Grails is not launched two days a day, it is
Entboost 0.8 Linux (click to download) version released, update content: 1. PC-side group chat, increase the ability to send temporary group files, partial interface perfect, and chat bug fix; 2. Android Android released the second version of the app, the third version of the Android SDK, add some feature interface; 3. Apple iOS releases the second version of the iOS SDK, which adds support for sending and receiving emoticons, images, voice, and group
through a picture of what he has learned. See this picture, you can learn what you know, the application of the ease.And my understanding of this figure, I feel that the most useful is just the beginning of the study of younger brother or sister. At the beginning of the student movement, all start from a single machine, with the gradual deepening of technical mastery. The figures in your mind/pictures on your books should also be expanded to extend to the diagram at the beginning of this articl
Entboost,version 2014.180 Linux release, mainly to increase the enterprise IM application integration capabilities, improve the Android SDK features and some bug fixes;7/1 (Tomorrow) Release the Windows version, stay tuned!Entboost is a cross-platform, cross-application of real-time communication platform, Embu Network is committed to helping developers, software companies and enterprises to build enterprise-class Instant messaging platform and operat
Currently, open-source Yum has USTC and 163. If you download the repo file directly from the Internet, an error will be reported during the operation. You have manually modified it:
USTC yum is used. The configuration file is as follows:
[Root @ web1 yum. Repos. d] # Cat USTC. Repo
[Base]
CentOS-5.9-base-mirrors.ustc.edu.cn
Baseurl = http://mirrors.ustc.edu.cn/centos/5.9/ OS /?basearch/
Gpgcheck = 0
Enabl
needs, keepalived script without any constraints, any way to write it, heartbeat script is constrained, that is, to support service Start/stop/restart this way, and Heartbeart provides a lot of default scripts, simple binding IP, start Apache and other operations have been;Usage advice: priority to use keepalived, when keepalived is not enough to choose heartbeatKeepalived uses the VRRP protocol mode, virtual Routing Redundancy Protocol (Vsan Router Redundancy Protocol, abbreviated as VRRP);Hea
Ulimit-n xx, which is the default value of 1024.Ulimit-n 4096 increase the number of files that can be opened by each process to 4096, with a default of 1024Some of the important settings that other recommendations are set to unrestricted (unlimited) are:Data segment Length: ulimit-d UnlimitedMaximum memory size: Ulimit-m UnlimitedStack size: Ulimit-s UnlimitedCPU Time: Ulimit-t UnlimitedVirtual Memory: Ulimit-v UnlimitedOur company server needs to a
){Perror ("listen ");Exit (1 );}Printf ("listening... \ n ");/* Use the descriptor of the socket function as the file descriptor */Fd_zero ( inset); // initialize the socket setFd_set (sockfd, inset); // The select () mechanism provides an fd_set data structure, which is actually a long array?// Each array element can be associated with an open file handle (whether it is a socket handle, another file, named pipe, or device handle ).While (1){Tmp_inse
Before there is a write Raspberry Pi 3B How to only use a network cable VNC remote blog, which is written in a relatively rough (in fact, it is a long time did not make me also forget how to pretend, according to the original look should be able to remember), so re-create in the new environment to build a VNC server.Original Blog Address: http://blog.sina.com.cn/s/blog_74a54ab80102x7le.htmlInstallation steps?:1, first there is a Linux mint installed a
The previous test encountered a "too many open files" issue. Ulimit-hn found out that the maximum open file number on the server is 4096. Wrote a simple script to detect that the process created by the number of FD is increasing, 8 minutes later reached the upper limit and then the program error, most of which FD is about the socket.Install lsof on the
use the above approach in Ubuntu and restart the Apache service, I still can't rewrite the URL properly.Here, there is one more thing to note: sudo vim/etc/apache2/sites-enabled/000-default will have the following: allowoverride None modified to: allowoverride all the above/etc/apache2/sites-enabled/000-default is actually a/etc/apache2/sites-available/default connection.The allowwoverride None will completely ignore the. htaccess file, and naturally the rewrite rules defined therein will not
Configuration:1 Enter the configuration directory:Cd/opt/lampp/etc2 Edit the configuration file:VI httpd.conf3 configuration: Add the following code snippet# gzip Compression 99# compression type HTML, XML, PHP, CSS, Jsaddoutputfilterbytype DEFLATE text/html text/plain text/xml application/x-javascript application/x-httpd- Phpaddoutputfilter DEFLATE js CSS4 Restarting Apache:/OPT/LAMPP/LAMPP restartCompression effect Comparison:As you can see, when Gzip is turned on, the file is compressed to a
Label:$./runinstaller command execution, pop up an error message dialog box, the content is very simple, only "info:info" a few words (server named info)1. View detailed error information$CD/tmp$more Orainstall2014-04-18_01-38-41am.err2, problem analysis2.1 View host Name: INFO$ hostname2.2 Viewing the IP and host name configuration in the hosts$ cat/etc/hosts#127.0.0.1 localhost localhost.localdomain localhost4localhost4.localdomain4:: 1 localhost lo
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