Programming VIP

Principle: corosync provides the function of message layer of cluster, transfers heartbeat information and cluster transaction information, and monitors heartbeat by multicast between multiple machines. pacemaker works in the resource allocation layer, provides the function of resource manager, and configures resources with crmsh, the comman ...

Tomcat service setup steps Initialization of an environment begins with the first graphical interface entered after installation Configure the server to work in command line mode Close iptables and selinux Configure the local YUM source Restart the server to display the demo effect 2. The environment needed to install tomcat Install ...

1. pkg.available_version modulepkg.available_version: Returns the latest version of the queried package that can be installed or updated. If multiple packages are specified, the returned results are output in the form of a dictionary.[root@salt-master ~]# salt '*' pkg.available_version httpd salt-minion02.contoso.com: & ...

CentOS 5 series system comes with syslog 1.4.1centos6 series with rsyslog version 5.8.10CentOS 7 series with rsyslog version 7.4.7At present, the latest version of rsyslog is 8.27.0. rsyslog reconstructs the imfile module from 8.5.0. The wildcard can be supported in the file name.rsyslog: http://www.rsyslog.com/To upgrade rsyslog, you need to c ...

Explain Installation of LNMP environments usually starts with mysql/mariadb installation, followed by nginx installation, followed by php installation. Install dependency packages [root@localhost ~]# yum -y install gcc [root@localhost ~]# yum -y install gcc++ [root@localhost ~]# yum -y install gcc-c++ [root@localhost ~]# yu ...

Introduction to Redis Cluster: The Redis cluster is a distributed implementation with the following goals, sorted by design importance: * High performance and linear scalability of up to 1000 nodes.There is no proxy, asynchronous replication is used, and there is no merge when assigning values. *Acceptable write security: When a clien ...

  Nagios is a commonly used open source monitoring software. Nagios is flexible and portable so that it can be used flexibly according to its actual situation. However, Nagios has a disadvantage that the drawing is not perfect enough, so Nagios has a short board when analyzing monitoring data. However, because of the flexibility of Nagios, ...

I. Preparation I have a website on Google VM here, so I plan to install ELK on a server I purchase to process the access log for analyzing nginx. Operating System Version: CentOS 7 ELK Version: 7.1 1.1. Server environment preparation We still use the official yum source for installation here. It is easy and easy to configure the official yum ...

1. Install virtual machines Don't repeat here 2. Configuring yum sources Install epel source [root@localhost ~]# yum -y install epel-release Install webtatic source [root@localhost ~]# rpm -Uvh http://mirror.webtatic.com/yum/el7/webtatic-release.rpm Configure zabbix source vim /etc/yum.repos.d/zabbix.repo [zabbix] name=zabbix b ...

1. Understanding Nginx Nginx ("engine x") is a high performance HTTP and reverse proxy server, as well as an IMAP/POP3/SMTP proxy server. Nginx was developed by Igor Sysoev for Rambler.ru, the second most visited site in Russia. The first public version, 0.1.0, was released on October 4, 2004. It distributes the source code in BSD-l ...