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💡 How to create a BPF map Programmers often send messages to programs to cause program behavior to be called. The most magical function of bpf is the code running in the kernel, and the program loading these codes can realize real-time communication through message passing. BPF mapping is that key values are stored in the kernel and can be ...

1, Introduction to MySQL master-slave replication Introduction: the master-slave replication of MySQL is to obtain the log content of the bin log file of the master server from the server, parse the SQL statement and update it to the slave server, so as to make the data of the master and slave servers consistent.Mode: MySQL database supp ...

Objectives: Understand the characteristics of HaproxyEasily use Haproxy to build clusters Content: 1, HAProxy features: Support two proxy modes: TCP (layer 4) and HTTP (layer 7), and support virtual host;It can supplement some shortcomings of Nginx, such as Session retention, Cookie guidance and so onSupport url detection, back-end server ...

1, KVM introduction 1. Introduction to KVM KVM The full name is kernel based virtual machine( Kernel-based Virtual Machine)，It's a Linux A kernel module that enables Linux Into a Hypervisor. KVM Originally by an Israeli company Qumranet(//Developed by kju'ma,net / /). KVM was officially incorporated into the Linux 2.6.20 core in February 20 ...

1.SNAT 1.1 SNAT application environment LAN hosts share a single public IP address to access the Internet (private IP cannot be routed normally in the Internet) 1.2 SNAT principle Modify the source address of the packet 1.3 preconditions for SNAT conversion 1. Each host of LAN has correctly set IP address, subnet mask and default gate ...

Practical operation: Idea: first download nginx package on one computer, and then distribute it with ansible Download and install nginx first wget http://mirrors.sohu.com/nginx/nginx-1.9.6.tar.gz Unzip file tar -zxvf nginx-1.9.6.tar.gz First in directory cd nginx-1.9.6 Download and install plug-ins yum install gcc gcc-c++ pcre-devel ...

ceph cluster construction ceph ceph is called future oriented storage Chinese Manual: https://access.redhat.com/documentation/zh-cn/red_hat_ceph_storage/5/html/architecture_guide/indexhttp://docs.ceph.org.cn/ Storage methods that ceph can realize: Block storage: provide storage like ordinary hard disk and provide "hard disk& ...

Deployment of front and rear end separation projects to ECS Alibaba cloud servers are used by bloggers 😊 No more nonsense. Let's start directly Recommended tools: XFTP: used to transfer files to the server Lanzou cloud download password: ciwg XShell: used for remote connection and operation of server Lanzou cloud download password: 3 ...

Reprint: http://book.odoomommy.com/chapter5/README14.html Chapter 14 startup of Odoo Startup script Let's take a look at the startup script of Odoo first: __import__('os').environ['TZ'] = 'UTC' import odoo if __name__ == "__main__": odoo.cli.main() It can be seen that the startup of odoo has done two things: Set the time zone of the ...

File system operation First, we study the system calls used to communicate with the kernel from the standard library. Although file operation is a standard function for all applications, the operation on the file system is limited to a few system programs, that is, the mount and umount programs used to mount and unmount the file system. Regis ...