View installed memory and swap space usage in Linux
Catalog
1. free view memory usage
2. View / proc/meminfo file for physical memory information
3. top command gets memory usage
1. free View Memory Quantity Command
This command is a special command for viewing the amount of memory. This command has many parameters, which can display ...
Posted on Wed, 06 Mar 2019 20:33:23 -0500 by angeljyt
Using Let's Encrypt to Generate Free SSL Certificates
SSL (Secure Sockets Layer) and its successor TLS (Transport Layer Security) are security protocols that provide security and data integrity for network communication. TLS and SSL encrypt the network connection at the transport layer.
The usefulness of SSL
Through SSL encryption, the data interaction between website and users will be more secu ...
Posted on Sun, 03 Mar 2019 20:57:22 -0500 by Hell Toupee
Practice VLAN under Linux System
01 Preparatory Environment
Environment: ubuntu 16.04 environment (physical or virtual)
Confirm whether the CPU supports virtualization:
# egrep -o '(vmx|svm)' /proc/cpuinfo
# vmx
If not, restart after KVM nested virtualization is turned on.
1.1 Installation of KVM Environment
sudo apt-get install -y qemu-kvm ...
Posted on Wed, 27 Feb 2019 20:51:21 -0500 by SupaMonkey
SUSE12Sp3 installation configuration. net core production environment - RPM installation MySQL 5.7
1. Copy the following installation packages to the server
mysql-community-client-5.7.24-1.sles12.x86_64.rpm
mysql-community-server-5.7.24-1.sles12.x86_64.rpm
mysql-community-libs-5.7.24-1.sles12.x86_64.rpm
mysql-community-common-5.7.24-1.sles12.x86_64.rpm
2. Installation of Software
sudo rpm -ivh mysql-community-common-5.7.24-1.sles12.x86_64.rp ...
Posted on Mon, 18 Feb 2019 04:51:19 -0500 by meburke
SUSE12Sp3 installation configuration. net core production environment - install. NET Core 2.2.1 runtime and run. NET code
1. Installing libicu dependencies
1. On-line Installation
sudo mkdir /usr/local/dotnet #Create directory
cd /usr/local/dotnet
sudo wget https://Download.visual studio.microsoft.com/download/pr/53cace8f-2907-487e-84d7-bc7a7ba5de05/326704ffa2ef9d4dcd0db2f1da996ebb/aspnetcore-runtime-2.2.1-linux-x64.tar.gz#Download offline installation package
su ...
Posted on Sun, 17 Feb 2019 22:51:19 -0500 by TecBrat
cmake troubleshooting: Cannot specify link libraries for target
Recently, we studied the compilation method of cmake to configure Qt, and wrote CMakeLists.txt, which was compiled but failed to link successfully. Because it used mac osx, we thought that there was a problem with different system link libraries. Check the path given by him (the content of variable ${QT_LIBRARIES}) as follows:
/Volumes/Desig ...
Posted on Wed, 13 Feb 2019 21:21:19 -0500 by kardiostep
In version 6.5 of Centos, what happens if the capacity of df-h is not the same as that of du-sh?
The question is, the capacity of df-h is different from that of du-sh. Is there a problem?
Here are the results of du-sh* and df-h, respectively.
[root@mail /]# du -sh *
6.2M bin
22M boot
172K dev
29M etc
165G home
130M lib
26M lib64
16K lost+found
4.0K media
4.0K mnt
4.0K opt
du: cannot access"proc/9139/task/9 ...
Posted on Tue, 12 Feb 2019 23:27:18 -0500 by drawmack
device_create(), device_register(), deivce_add() differences
This article is based on linux 3.10.40. Other versions are for reference only.
In the introductory tutorial of character device driver development, the most common way is to create device nodes with device_create() function. However, device_create() is rarely seen in the process of reading the kernel source code. Instead, device_register( ...
Posted on Tue, 12 Feb 2019 23:18:18 -0500 by broheem
Oracle 11g MEMORY_MAX_TARGET Setting to 0 Problem Handling
Setting Oracle 11g MEMORY_MAX_TARGET to 0 under linux
> yope(2017_08_08)
Causes of the problem:
Because the original business memory of the database server can not meet, so the increase of memory, CUP and hard disk, which has the following oracle Performance tuning.
In plsql, the following tuning schemes are executed, and the specific parame ...
Posted on Tue, 12 Feb 2019 12:00:18 -0500 by Coronach
Solution to "No such device" error when opening / dev/fb0: Activate VESA FrameBuffer driver
When using the Linux system function mmap(), mapping FrameBuffer to memory to implement a simple snake-eating game, when testing on its own Edhat 6.4, the result of running the program prompts, "No such device". However, under / dev / you can see that both fb0 and FB exist, and the operation permissions are sufficient. At first, I di ...
Posted on Mon, 11 Feb 2019 00:12:19 -0500 by rcorlew