Ganglia is an open source cluster monitoring visualization tool initiated by UC Berkeley, which is designed to measure thousands of nodes. Ganglia's core includes gmond, gmetad and a Web front end. It is mainly used to monitor the system performance, such as: cpu, mem, hard disk utilizat ...
Posted by mackevin on Wed, 19 Feb 2020 23:19:50 -0800
1. Confirm kernel version
CentOS7 kernel is generally 3.10, which meets the installation conditions (> = 3.8)
2. update pack
yum unpdate -y
This process may be a little slow. If there is a higher version of kernel, it will update back to 3.10
View the current default kernel
Changed to newer k ...
Posted by jameslloyd on Wed, 19 Feb 2020 06:38:38 -0800
Check and delete the original yum source
Download the yum source for CentOS
Install RPM package
Modify yum configuration
Clean up and rebuild cache
Because red hat's Yum needs to be charged and registered before it can be used. So I want to update the yum source to ...
Posted by Bizzle on Wed, 19 Feb 2020 05:44:06 -0800
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 ...
Posted by jiggens on Sat, 15 Feb 2020 18:47:48 -0800
Getting started with mysql 01
What is a database?
Classification of database
The construction of mysql database
View initial password
Login with initial password & & modify initial password
Modify password policy
Posted by burge124 on Thu, 13 Feb 2020 04:46:37 -0800
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 ...
Posted by McChicken on Sat, 08 Feb 2020 08:27:13 -0800
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 ...
Posted by ifuschini on Wed, 05 Feb 2020 02:59:10 -0800
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 ...
Posted by xtopolis on Sat, 01 Feb 2020 08:52:44 -0800
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 ...
Posted by purpendicular on Fri, 31 Jan 2020 01:40:49 -0800
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, ...
Posted by shaoen01 on Thu, 30 Jan 2020 08:16:00 -0800