Linux counts the number of occurrences of a character in a file
In Linux, you can use the command line tools "grep" and "wc" to count the number of occurrences in the file
Linux
Linux counts the number of requests for a certain port
netstat -an will print the current network link status of the system
How does Linux determine whether Crontab is running normally?
In the process of our development, we often encounter situations where scheduled tasks are not executed as expected. In the Linux system, timing tasks are generally implemented by the system Crontab. This article discusses how to judge whether the Crontab is running normally.
Linux system DNS error resolution
CentOS, Euleros series operating systems: ping the public network domain name fails, prompting Name or service not known, but you can ping the elastic public network IP, CURL is the same
Linux one command counts Nginx access IP
Count IP access from Nginx logs
tar package compression and decompression
The Linux tar (English full spelling: tape archive) command is used to back up files. tar is a tool program used to create and restore backup files. It can add and unlock files in the backup file
How to choose a server system: CentOS, Ubuntu, Debian
These versions have different characteristics and play different roles in different application fields, so they cannot be generalized. And most VPS only provide release versions maintained by the open source community
【Docker + SELinux】 Teach you how to write custom SELinux policies for containers
This article teaches you how to write a custom SELinux strategy for Docker containers
【Docker + Selinux】 Can't Open / Permission denied
The main solution is how to configure `docker` security in the environment where `selinux` is turned on, as well as common error solutions. It is not blindly `chmod -R 777`,`--privileged=true`,`setenforce 0` , But focus on using the `selinux` security strategy
Use scp to transfer files between Linux devices
Suppose you have a file that needs to be removed from the server, or you want to put it on the server. It would be a bit redundant to set up some form of FTP client, or configure a share to handle this small task