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Account security: 1,User information file /etc/passwd # Format: account:password:UID:GID:GECOS:directory:shell # User name: Password: user ID: group ID: user description: Home Directory: shell after login root:x:::root:/root:/bin/bash # View logged in users: cat /etc/passwd | grep /bin/bash # View users with UID=0 awk -F: '$3==0{print $1}' / ...

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 ...

catalogue brief introduction structure characteristic Environmental preparation 1. Experimental description 2. Check whether the hardware information supports virtualization 3. Closure of essential services Install and configure KVM service 1. Install kvm dependent packages 2. Start libvirtd service 3. Create virtual machine 4.KVM v ...

Logical volume related operations You can think of a logical volume as a component area, so of course, this logical volume also needs to be formatted and mounted. In addition, the logical volume can also be dynamically resized, and the data will not be lost, and there is no need to unmount the logical volume. The commonly used commands are l ...

1.1 template virtual machine environment preparation 0) install the template virtual machine, with IP address 192.168.10.100, host name Hadoop 100, memory 4G and hard disk 50G 1) The configuration requirements of Hadoop 100 virtual machine are as follows (the Linux system in this paper takes CentOS-7.5-x86-1804 as an example) (1) Using Yu ...

The previous Blog introduced in detail why Docker appeared and what problems it appeared to solve; The basic components and architecture of Docker. This Blog will learn more about how to install and uninstall Docker and what are the common operation commands. Because Docker can be installed on any physical machine, virtual machine, public cloud ...

1. Preparation of relevant documents (1) linux installation file preparation, installation of oracle Software and instances, download link: https://www.oracle.com/cn/database/technologies/oracle-database-software-downloads.html#19c Choose Linux x86_64 system version, click download. Log in with Oracle account before downloading. If there is no ...

FastDFS 1. Introduction to FastDFS FastDFS is an open source distributed file system. It manages files. Its functions include file storage, file synchronization, file access (file upload, file download), etc. It solves the problems of mass storage and load balancing. It is especially suitable for online services based on documents, such as ph ...

The Kill Command seems to mean "kill" at first glance, but in fact, the kill command is used to send signals. Let's take a look at the types of signals first. Type of signal Signal: a message sent by one process to another process. There are more than a dozen signals in the Linux system, and each signal is assigned a number and a na ...

1. Install gcc environment yum install gcc-c++ 2. Install two libraries The first libevent Library yum -y install libevent The second libfastcommon Library libfastcommon download address: https://github.com/happyfish100/libfastcommon/archive/V1.0.43.tar.gz Copy the downloaded libfastcommon to the / usr/local / directory, and then execute ...