Install and use Netdata performance monitoring tool on Debian 9
Netdata is a free, open source, scalable, distributed, real-time, performance and health monitoring tool for Linux-based operating systems. Netdata comes with a simple, easy-to-use, and scalable web dashboard that can be used to visualize processes and services on your system. You can use Netdata to monitor CPU, RAM usage, disk I/O, network traffic and Postfix. Netdata runs on all systems such as physical machines, virtual machines, containers and IoT devices without interrupting its core functionality. Netdata comes with a lot of features, some of them are listed below: Stunning interactive bootstrapping dashboard. Supports dynamic thresholds, alert templates, hysteresis and multiple role-based notifications
Jun 02, 2024 am 09:08 AM
How to import, export, backup and restore mongodb
1. Back up Mongodbmongodump-hRuiyIp-ddataname-o/home/aa/dev/mongodb/datamongodumpmongo export database command mongodump--help can view all the help under this command-h export source-d database name to be exported-o database to The export position is after the terminal scrolls through N lines. The database export is completed. You can go to the /home/aa/dev/mongodb/data directory to view the exported file, which is in bson format (I did not see the file immediately after exporting, so I have to wait. It appeared after a while, the reason is unknown). 2.Restore use: mongores
Jun 02, 2024 am 09:02 AM
How to build the necessary packages for custom Linux kernel source code compilation?
Build a custom kernel on Debian/Ubuntu The Linux kernel is the core of all Linux systems, including thousands of GNU/Linux distributions, Android Unicom operating systems, and a large number of embedded systems, network devices, etc. Its popularity and ubiquity can be attributed to the fact that it is free and open source. Anyone can download the Linux kernel, modify it as needed, and compile it for their own commercial or private use. With nearly 30 million lines of code and a large number of contributors from around the world, the Linux kernel sounds like a complex project that the average user would never bother with, right? You might think that the core of any such operating system should be left to scientists, programmers, and IT professionals
Jun 02, 2024 am 09:01 AM
DHCP installation in a single zone
Case: The technical department has 200 computers. The 192.168.0.0/24 network segment is used by the technical department. The router IP address is 192.168.0.1, the DNS server IP address is 192.168.0.254, the DHCP server is 192.168.0.253, and the client address range It is 192.168.8.30-192.168.8.250, the subnet mask is 255.255.255.0, and the department manager uses the XP system to fix the IP address to 192.168.0.252. Steps: 1. Modify the main configuration file dhcpd.conf. Note: The host needs to know the MAC address of the client to assign a specific IP address to this client.
Jun 01, 2024 pm 10:27 PM
DHCP common configuration file analysis
This article provides a detailed analysis of several common files during the DHCP installation process. The specific analysis is as follows: /etc/dhcpd.conf This is the main configuration file of the DHCP server. However, this file does not exist after the DHCP server is installed in some systems, so it needs to be created manually. Others have this main configuration file but no content. Just copy the corresponding template to this configuration file. /usr/sbin/dhcpd is the executable file that starts the entire dhcp server. /var/lib/dhcpd/dhcpd.leases This is the record of the start and expiration time of the lease establishment between the DHCP server and the client. These records are in this file. The DHCP server is not started
Jun 01, 2024 pm 10:18 PM
Linux kernel, initialization file, installation source, boot menu, menu
Experimental environment As a company's business continues to develop, the number of server hosts also decreases rapidly. For function changes or newly purchased servers, the CentOS7 operating system needs to be reinstalled. In order to improve the efficiency of server installation, it is required to implement full manual unmanned operation based on PXE network. Watch batch installation. Requirement description>The IP address of the server is "192.168.184.101", and the public network is "192.168.184.0/24". >Build a PXE network installation server and install the CentOS operating system on the newly purchased bare metal of 10 servers. >The newly installed system is a minimal installation, and the default language is "Chinese". >Manually configure the YUM warehouse for the newly installed system, roo
Jun 01, 2024 pm 09:57 PM
c/c++ compiler running process based on command line input
Directory first: c/c++ compilers gcc, cc, c++, g++ included in linuxgcc Second: gcc features Third: gcc running process Fourth: gcc options Fifth: Some of the conventions and rules followed by gcc First: The c/c++ compilers included in linuxgcc are gcc, cc, c++, and g++. gcc and cc are the same, and c++ and g++ are the same. Usually c language programs are compiled with gcc. How to compile linux with gcc. How to compile linux with gcc, c++ The program is compiled with g++. Second: gcc features gcc is a portable compiler that supports multiple hardware platforms. Such as ARM, X86, etc. In addition to being a local compiler, gcc
Jun 01, 2024 pm 09:57 PM
On data loss in large clusters
There are three commonly used replication routines: The database ensures that each copy of the data is copied to three independent disks on three different computers. The reason for this is simple: disks only fail at a certain moment. If one disk dies, you have time to replace it, and you can still take one of your other two copies. to restore the data and write it to the new disk. The probability that the second disk will die before you restore it is so low that the probability of both your disks dying at the same time is as slim as an asteroid hitting the earth. We also made special calculations. The probability of one disk failure is almost 0.1% (maybe rough). The possibility of two disks failing is almost 10 to the power of 6. Three disks fail at the same time.
Jun 01, 2024 pm 09:33 PM
Methods to solve the Chinese garbled problem of vim in Linux server and introduction of related parameters
When logging in to a Linux server remotely and using vim to edit and view files in the terminal, various English garbled problems often occur. Making the following settings can basically solve the vim English garbled problem. First check the system's support for English locale-a|grepzh_CN output sample is as follows zh_CN.gbkzh_CN.utf8vim can only correctly identify the English encoding files in the list. If you need to identify other encoding types of English file, you need to do a system upgrade vi~/.bash_profile file and add exportLANG="zh_CN.UTF-8" exportLC_ALL="zh_CN.UTF-8" at the end of the file
Jun 01, 2024 pm 09:20 PM
Analysis of CPU usage metrics!
Yes, what I'm talking about here is the "%CPU" metric that everyone uses everywhere, in every performance monitoring product. Use the top(1) command to view it. You might think that 90% CPU usage means: When actually it might mean: Stalled means the processor is making no progress processing instructions, usually due to the processor waiting for memory input/output. The ratio I drew above (between busy and stuck) is what I see often in real production environments. It's possible that you're basically at a standstill and don't even know it. What does this mean to you? Knowing how much of your CPU is stalled can guide performance tuning efforts between reducing code or reducing memory I/O
Jun 01, 2024 pm 09:18 PM
Uptime command introduction
The Linux uptime command is self-explanatory. The uptime command tells you how long the system has been up (running). This is the syntax: uptime [options] The man page of this tool says this: uptime will display the following information in one line: the current time, how long the system has been running, how many users are currently logged in, and the top 1, 5 and 15 The average load of the system in minutes. The following cases in question and answer format should give you a better understanding of the uptime command. Q1. How to use the uptime command. The basic usage of uptime is very simple - just enter the command name and press Enter. This is the output: Here, the first item is the current time, and up means that the system is
Jun 01, 2024 pm 09:02 PM
arm-linuxgtk, a port of gtk in ARM
#主机安装gettextlibglib2.0-devsudoapt-getinstallgettextlibglib2.0-devexportPREFIX=/gtkdfb&#installglib2.16echoac_cv_type_long_long=yes>arm-none-linux-gnueabi.cache&echoglib_cv_stack_grows=no>>arm-none-linux-gnueabi.cache&echoglib_cv_
Jun 01, 2024 pm 08:32 PM
Don't worry about old versions of Linux—use DKMS to easily create RAID card drivers
Technical students may have felt something like this - they encounter new problems or learn new knowledge every day. However, although a person's time and energy are limited, not all positions can be done personally, and everyone's areas of expertise are also different. In order to help engineers who have experienced pitfalls and practical experiences and experiences, it is particularly valuable to record and share their experiences. This is the purpose of our "Engineer's Notes" column. Don’t worry about old versions of Linux—use DKMS to easily create RAID card drivers. In our technical support work, we often encounter customers who need to install old versions of Linux operating systems on our new servers, and there are no external new versions of Linux available. Hardware
Jun 01, 2024 pm 08:16 PM
How to use force uninstall technique to uninstall software in Linux?
Linux is a very stable and secure operating system because the software is designed to only access the resources it has been granted. This means that if you use Linux's default package manager to install software, it is also extremely easy to uninstall it. Moreover, sometimes you may encounter some software that is difficult to uninstall using the package manager. In this case, you need to use the forced uninstall method. In this article, we will explain how to use the force uninstall method to uninstall software in Linux. We'll cover three basic methods: using the command line, using uninstall tools, and automatically deleting files. Understanding this approach will help you better manage your Linux system. Using the command line to force uninstall software The most common form of force uninstalling software in Linux is to use
Jun 01, 2024 pm 06:53 PM
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