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MySQL MHA 1, MHA concept MHA (MasterHigh Availability) is a set of excellent software for failover and master-slave replication in MySQL high availability environment.The emergence of MHA is to solve the problem of MySQL single point.During MySQL failover, MHA can automatically complete the failover operation within 0-30 seconds.MHA can e ...

1, Installing YUM Repo 1. Download command: wget https://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm 2, To install repo: rpm -ivh mysql57-community-release-el7-9.noarch.rpm [root@VM-0-10-centos server]# rpm -ivh mysql57-community-release-el7-9.noarch.rpm warning: mysql57-community-release-el7-9.noarch.rpm: He ...

Meaning of different file colors Color modification:[root@fyr ~]# ls --color=no / / turn off color [root@fyr ~]# ls --color=yes / / open color Black: ordinary file (e.g. txt)Blue: folderSky blue: linked filesGreen: executableRed: compressed fileYellow: block device files (e.g. hard disk, U SB flash disk) Expansion: -Ordinary ...

catalogue 1, Linux Application Foundation 1. Relationship between application program and system command  2. Common package encapsulation types 2, RPM package management tool 1.Red-  Hat Package Manager 2.RPM software package 3.rpm command function 4. Query RPM package information 5. Install, upgrade and uninstall RPM software pac ...

catalogue 1. Document processing command 1.1 # directory processing 1.2 document processing 1.3 link handling 2. Permission management command 2.1 change authority 2.2 # change of ownership 3. File search command 4. Help command 5. User management commands 6. Compression and decompression command 7. Network command 8. Shutdown and ...

docker manages data in containers in two main ways: -Data Volumes -Mount Host Directory (Bind mounts) Data Volume in order to well realize data saving and data sharing, Docker puts forward the concept of Volume, which simply bypasses the default federated file system and exists on the host in the form of normal files or directories. Also kno ...

Flume introduction and flume deployment, principle and use Flume overview Flume is a highly available, reliable and distributed system for massive log collection, aggregation and transmission provided by Cloudera. Flume is based on streaming architecture, which is flexible and simple. Flume's main function is to read the data from the server ...

1. Principles and Features (Functions) 1. Main features Multidimensional data model (Time series consists of metric name and labels for k/v)Flexible Query Language ( PromQL)Distributed storage without dependencies; Single-node servers are autonomousUse http protocol, pull mode to pull data, easy to understandMonitoring objectives, which can b ...

Introduction to Shell programming Symbols of references: Single quotation mark: WYSIWYG Double quotation marks: parse variables (treat the input as a whole) Backquotes: parsing commands No quotation marks: similar to double quotation marks Why learn Shell programming Shell will be widely used in Linux system, and we also need to ...

introduction This article introduces three special permissions of Linux file system: suid, sgid and sticky. Article catalogue 0 × 1. How to view the default permissions of files created by the current user0 × 2. How to add suid permission to a file0 × 3. How to add sgid permission to a folder0 × 4. How to add sticky p ...