Programmer Group

rpm can realize fast and simple installation of programs (compared with compilation and installation), but rpm can't solve dependency by itself, so many tools come into being to solve dependency automatically, among which yum is one of them. yum solution to dependency: There must be a file server where all the rpm packages and the package rel ...

Getting started with mysql 01 What is a database? Classification of database The construction of mysql database mysql introduction Installation software Initialization View initial password Login with initial password & & modify initial password Modify password policy Related parameters ...

Gitlab is an open source application developed using Ruby on Rails that implements a Git project repository that can be accessed through a Web interface from public or private projects Gitlab has similar capabilities as Github to browse source code, manage bugs and comments.Can manage team access to the repository, he is very easy to browse su ...

What is LVS? LVS (Linux Virtual Server), or Linux virtual server, is an open source load balancing project led by DR. Zhang wensong. At present, LVS has been integrated into Linux kernel module. This project implements the load balancing scheduling scheme of data request based on IP in Linux kernel. I ...

Introduction to MHA architecture MHA is the abbreviation of Master High Availability. It is a relatively mature solution for MySQL high availability at present. Its core is a set of scripts written in perl language. It is an excellent set of high availability software for failover and master-slave promotion in MySQL high availability environme ...

Varnish is a high-performance open source HTTP Accelerator, Open source reverse proxy and cache servers, Norway Verdens Gang, the largest online newspaper, replaced 12 squids with three varnishs, with better performance than before Basic access to the website firefox - > hosts/dns - > varnish - > server - > varn ...

Environmental Science:Now there are three virtual machines of CentOS 7, namely, Hadoop 102, Hadoop 103 and Hadoop 104. Now configure ntp service (central server) on Hadoop 102. Hadoop 103 and 104 pull the time on Hadoop 102 respectively 1. Check whether ntp is installed (check and install all 3 sets, ...

Preface ELK is the abbreviation of three kinds of software, which are composed of Elasticsearch, Logstash and Kibana. In the process of development, there are new members, Beats, which form Elastic Stack. So, ELK is the old name, and Elastic Stack is the new name. The entire Elastic Stack technology ...

Preface Blogger github Blogger's personal blog http://blog.healerjean.com 1. Help instruction 1.1 – - help: display command help information inside the shell --The help command is used to display help information inside the shell. The help command can only display command help informati ...

Configure corosync Install corosync pacemaker in both server5 and server6 yum install corosync pacemaker -y Edit the corosync configuration file in server5 mv /etc/corosync/corosync.conf.example /etc/corosync/corosync.conf vim /etc/corosync/corosync.conf # Please read the corosync.conf.5 manual page compatibility: whitet ...