There are two ways to implement raid:
The performance of software RAID is low because it uses the resources of the host. You need to load the raid software to read data from the software RAID volume. Before loading the raid software, the operating system needs to boot up to load the raid software. No physical hardware is required in software RA ...
Posted by karnetics on Tue, 09 Jun 2020 22:36:20 -0700
Detailed explanation of linux shell command line options and parameter usage
In bash, there are three ways to handle command line arguments
- direct processing: use $1, ,...,$n for parsing
- getopts: the case of a single character option (for example: - n 10 -f file.txt Etc.)
- getopt: can handle single character options or long opti ...
Posted by b-ware on Mon, 08 Jun 2020 21:20:15 -0700
Recently, many pits were encountered in the test of a customer's RHEL7 + 11204 RAC environment. Fortunately, they were found and handled in time before the official launch. Two of the problems are typical, so it is specially recorded that the problems are not caused by the self startup of O-related services after the host restarts. It seems tha ...
Posted by illusiveone on Mon, 08 Jun 2020 19:10:37 -0700
View mysql profile address
mysql --help|grep 'my.cnf'
ps aux|grep mysql|grep 'my.cnf'
The configuration is divided into two parts, the master server part and the slave server part
In this test, the master and slave of the two machines are synchronized, and the environment is windows (the same as Linux)
Main server ip:192.168.1.199
Slave serve ...
Posted by busnut on Sun, 07 Jun 2020 19:52:27 -0700
Simple command line implementation based on STM32
Hi,long time no see. I looked at the atomic usmart and lwip official shell, and found that they all had one thing in common. After identifying the first command, I began to find the callback, and did not count the argc and argv. There are also many peo ...
Posted by warrenk on Sun, 07 Jun 2020 19:42:38 -0700
cmake basic introduction (1)
Official help documents
CMake is a cross platform make.
CMakeLists.txt The brief introduction is as follows:
# Auto CMakeLists.txt: frame with cppunit use for lintcode/leetcode
# minimum cmake version
cmake_minimum_required(VERSION 3.7) # cmake minimum version ...
Posted by Cyberspace on Sun, 07 Jun 2020 00:39:06 -0700
One MySQL host in the production environment has a single point of failure, so we want to make sure that MySQL is highly available, that is, two MySQLsServer If one of the MySQL servers hangs up, the other can take over immediately.
MySQL's highly available solutions are generally as follows:
Posted by jwbworks on Fri, 05 Jun 2020 18:17:35 -0700
Puppet is a centralized configuration management system for Linux, Unix and windows platforms. It uses its own puppet description language to manage configuration files, users, cron tasks, software packages, system services, etc. These system entities are called resources by puppet. The design goal of puppet is to simplify t ...
Posted by nareshrevoori on Fri, 05 Jun 2020 03:36:06 -0700
docker storage volume
Why data volumes (storage volumes) are needed
The docker image is made up of multiple read-only layers. When the container is started, the docker loads the read-only layer and adds a read-write layer to the mirror layer.
If the running container modifies an existing file, the file will be copied from the ...
Posted by eternalprophet on Thu, 04 Jun 2020 10:35:35 -0700
Recently, you need to install the dokcer environment on CentOS 7, recording how to implement it based on Alibaba cloud agent.
1. Replace CentOS image
(1) Back up the original image
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
(2) Download new CentOS-Base.repo
wget -O /etc/yum.repos.d/CentOS-Base.r ...