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- Centos 7 backup and restore Redis data
- What is Redis? Redis is an in-memory key-value cache and store (i.e. database) that can also be persisted to disk. In this article, you will learn how to back up and restore your redis database on Centos7. Backup and Restore Instructions By default, Redis data will be saved to a .rdb file on disk, which is a point-in-time snapshot of the Redis data set. Snapshots are taken at specified intervals, so are perfect for backups. Data Backup In Centos7 and other Linux distributions, the default Redis database directory is /var/lib/redis. However, if you have changed the redis storage location, you can find it by typing: [
- LINUX 719 2024-09-02 14:02:32
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- Linux's love-hate relationship with ping packages
- By default, Linux systems allow ping, but in some cases, for security reasons, we set the server to disable ping. To temporarily allow the ping command, you can use the command: echo0>/proc/sys/net/ipv4/icmp_ignore_all. :0, represents permission; 1, represents prohibition of viewing the current settings: 0, for which we can ping and try using the ping command - t can continuously allow or prohibit ping. Modify the configuration file /etc/sysctl.conf and add a line as shown above. net.ipv4.icmp_echo_ignore_all=11 means prohibited.
- LINUX 1141 2024-09-02 14:01:10
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- Centos7 add delete Swap exchange partitions
- Swap means: swap partition, similar to Windows virtual memory, but when the physical memory is insufficient, part of the hard disk space is used as virtual memory, thereby solving the problem of insufficient physical memory capacity. Advantages: cost savings. Disadvantages: Inadequate performance. This method is not limited to Centos7 and can be used on all Linux systems. Operating user: root. Add swap partition space. Use the dd command to create the swap partition file /dev/mapper/centos-swap, with a size of 2G: $ddif=/dev/zeroof=/dev/mapper/centos-swapbs=1024count=2048000. Format the swap partition. :
- LINUX 976 2024-09-02 13:50:43
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- Centos 7 smoothly and seamlessly upgrades PHP7.1.0 to PHP 7.1.5
- Experimental environment: CentOS Linux release 7.3.1611 (Core) Kernel version: Linux version 3.10.0-514.el7.x86_641. There are two ways to check the PHP version, and the display results are the same. The first one #/usr/local/php/bin/php-v The second one #php-vPHP7.1.0(cli)(built:Dec17201617:00:32)(ZTS)Copyright(c)1997-2016ThePHPGroupZendEnginev3.1.0- dev,Copyright(c)1998-201
- LINUX 1410 2024-09-02 13:43:20
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- A brief introduction to common modules of ansible
- This article introduces commonly used modules. According to the official classification, the modules are classified by function into: cloud module, command module, database module, file module, asset module, message module, monitoring module, network module, notification module, package management module, source code control module, system module, Unit module, web facility module, windows module, please refer to the official page for details. Here we select some of the most commonly used modules from the officially classified modules for introduction (the commands module has been introduced in the previous article and will not be mentioned here). 1. The ping module tests whether the host is accessible. The usage is very simple and does not involve parameters: [root@361way~]#ansible10.212.52.252-mping10
- LINUX 683 2024-09-02 13:36:00
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- Introduction to Ansible Dynamic Inventory
- AnsibleInventory actually consists of two parts: static Inventory and dynamic Inventory. Static Inventory refers to the hosts and groups specified in the file /etc/ansible/hosts. DynamicInventory refers to obtaining the host list through an external script and returning it in the format required by ansible. To ansilbe command. This part generally combines the CMDB asset management system, zabbix monitoring system, crobble installation system, cloud computing platform, etc. to obtain host information. Since host resources generally increase or decrease dynamically, these systems generally update intelligently. We can use these tools to provide a
- LINUX 1060 2024-08-24 10:44:02
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- 7 ways to help you check the registration date of Linux users
- Did you know, how to check the creation date of an account on a Linux system? If you know, what can you do? Did you succeed? If yes, how to do it? Basically Linux systems don't track this information, so what are the alternative ways to get this information? You may ask why am I checking this? Yes, there are situations where you may need to review this information and it will be helpful to you at that time. You can use the following 7 methods to verify. Use /var/log/secure Use aureport tool Use .bash_logout Use chage command Use useradd command Use passwd command Use last command Method 1: Use /var/l
- LINUX 1465 2024-08-24 07:31:32
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- Summary of ansible usage: ansible installation
- 1. Introduction Ansible is a configuration management and application deployment tool. Its functions are similar to the current industry configuration management tools Chef, Puppet, and Saltstack. Ansible is developed through Python language. The Ansible platform was created by Michael DeHaan, who is also the author of the well-known software Cobbler and Func. The first version of Ansible was released in February 2012. Ansible manages machines through the SSH protocol by default, so Ansible does not need to install a client program on the server. You only need to install Ansible on a server. After Ansible is installed, you can manage and control it.
- LINUX 1140 2024-08-24 07:31:14
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- How to determine whether a Linux disk is a solid state drive or a mechanical hard drive
- Three methods to determine whether a Linux disk is a solid state drive or a mechanical hard drive: Method 1 determines the return value of cat/sys/block/*/queue/rotational (where * is the name of your hard drive device, such as sda, etc.), if it returns 1 If it returns 0, it means the disk cannot rotate, so it is an SSD. [pythontab@pythontab.com~]$cat/sys/block/sda/queue/rotational0[pythontab@pythontab.com~]$grep^/sys/block/*/queu
- LINUX 1345 2024-08-23 19:33:51
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- Interesting commands under Linux
- Let us learn the fun command screenfetch in Linux: display system and theme information. Installation and use: sudoaptinstallscreenfetchscreenfetch rendering: linux_logo: Linux version logo picture and system information. Installation and use: sudoaptinstalllinuxlogolinux_logo rendering: view the built-in logo list: linux_logo-f -LlistAvailableBuilt-inLogos:NumTypeAsciiNameDescription1ClassicYesa
- LINUX 1264 2024-08-22 19:58:45
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- rtop monitors remote hosts via SSH
- rtop is a direct, interactive SSH-based remote system monitoring tool that collects and displays important system performance metrics such as CPU, disk, memory, and network metrics. It is written in Go and does not require any additional programs to be installed on the server to be monitored, except for an SSH server and login credentials. rtop basically collects various system performance information by starting an SSH session and executing certain commands on the remote server. Once the SSH session is established, it refreshes the information collected from the remote server every few seconds (5 seconds by default), similar to all other top-like applications in Linux (such as htop). Installation requirements: To install rtop make sure you have Go installed in Linux (
- LINUX 1034 2024-08-22 12:02:32
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- Use the Diff and Meld tools to compare the differences between two directories
- Generally, to compare two files under Linux, we will use diff (a simple command line tool derived from Unix) to display the differences between two computer files; it compares files line by line, and is very convenient to use. , pre-installed in almost all Linux distributions. The question is how can we compare two directories under Linux? Now, we want to know which files/subdirectories are common to both directories and which ones only exist in one directory. The general syntax for running diff is as follows: $diff[OPTION]…FILES$diffoptionsdir1dir2 By default, the output is sorted alphabetically by the file name of the file/subfolder, as shown in the screenshot below
- LINUX 670 2024-08-21 16:39:30
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- How to use awk to output fields and columns in text
- First of all, we need to know that awk can automatically separate the input line into several fields. Each field is a set of characters separated from other fields by an internal field separator. If you are familiar with Unix/Linux or know bashshell programming, then you should know what the internal field separator (IFS) variable is. The default IFS in awk is tab and space. The field separator in awk works as follows: when a line of input is read, it is split into different fields according to the specified IFS. The first set of characters is field one, which can be accessed through $1, and the second set of characters is field two. , can be accessed through $2, the third group of characters is field three, can be accessed through $3, and so on.
- LINUX 711 2024-08-21 07:32:02
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- Redis high availability practice
- 0×01 Preface Redis is an open source log-type Key-Value database written in ANSIC language, supports network, can be memory-based and persistent, and provides APIs in multiple languages. Nowadays, Internet business data is growing at a faster rate, and data types are becoming more and more abundant, which puts forward higher requirements for data processing speed and capabilities. Redis is an open source in-memory non-relational database that brings a disruptive experience to developers. Designed from start to finish with high performance in mind, Redis is the fastest NoSQL database available today. While considering high performance, high availability is also an important consideration. Internet 7×24 uninterrupted service during downtime
- LINUX 1358 2024-08-20 16:51:04
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- Redis high availability practice
- 0×01 Preface Redis is an open source log-type Key-Value database written in ANSIC language, supports network, can be memory-based and persistent, and provides APIs in multiple languages. Nowadays, Internet business data is growing at a faster rate, and data types are becoming more and more abundant, which puts forward higher requirements for data processing speed and capabilities. Redis is an open source in-memory non-relational database that brings a disruptive experience to developers. Designed from start to finish with high performance in mind, Redis is the fastest NoSQL database available today. While considering high performance, high availability is also an important consideration. Internet 7×24 uninterrupted service during downtime
- LINUX 921 2024-08-20 16:51:02
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