Programmer Think

1. Foreword When setting up a cluster, you need to ensure that there is no problem in setting up a stand-alone version of redis. You can refer to Linux server Redis 6.x installation and configuration 2. Benefits of master-slave replication Read write separation, performance expansion Disaster recovery and rapid recovery The master libra ...

Linux thread synchronization 1. Mutual exclusion Ensure that only one thread accesses data at a time. pthread_mutex_t mut; //Two initialization methods mut = PTHREAD_MUTEX_INITIALIZER; pthread_mutex_init(&mut, NULL); 1. Initialization int pthread_mutex_init (pthread_mutex_t *__mutex, const pthread_mutexat ...

Message queue is the connection table of messages, which is stored in the kernel. This example mainly realizes inter process communication in the way of message queue. After receiving the message, the receiving end immediately forwards it to the sending end; After sending a message, the sender immediately monitors the message fed back by the re ...

This article mainly describes how to transplant u-boot-2022.01-rc4 to the cbt4412 core board (similar to the tiny4412 core board), and analyzes the reasons for modifying the file code. (there is a link to download the source code of GitHub at the end of the article) To transplant U-Boot, first select the development board with the same pro ...

When running the model on the server, you often encounter two problems: The model is too large and needs a long running time, and the computer can not be kept in the boot state all the time. Even if it is kept in the boot state, it is not sure which one will turn off and cause re runningDuring continuous training on the server, you find that y ...

1, LVS   LVS (Linux Virtual Server), namely Linux virtual server, is a virtual server system, which realizes the load balancing Cluster function on unix/Linux platform. LVS is a Cluster technology, which adopts IP load balancing technology and content-based request distribution technology. The scheduler has good throughput, transfers ...

Common commands Enter directory cd /usr #Enter the usr directory View catalog file ls #View all files in the current directory ll #View the details, permissions, size, time, etc. of all files in the current directory #ll command = = ls -l command ls Directory name #ls + directory name, you can view all files in the specified directory ...

System D uniformly manages the startup logs of all units. You can view all relevant logs (kernel log and application log) with only one command of journalctl. The configuration file for logs is / etc / Systemd / journald conf. Persistent systemd log CentOS 7 can use SYSTEMd journal as the log Center Library (generating log folders). Th ...

View network configuration Maximum mtu packet transfer rate View network interface information ifconfig View all active network interface information Execute ifconfig command View specified network interface information ifconfig network interface [root@localhost ~]# ifconfig ens33 ens33 flags=4163<UP,BROADCAST,RUNNING,MULTICAST& ...

catalogue 1, Installation environment 2, Initialize database 3, Configure master node masterdb 4, Configure slave node slavedb 5, Validate database master-slave service 1, Installation environment preparation 1. Node planning Prepare two virtual hosts to act as master dB and slave DB respectively IP addressHost namenode192.168.18.8mas ...