Nginx 的 limit 模块用于限制 Nginx 的访问。 limit 模块包含有两个部分： limit_conn 用于对连接数量的限制 limit_req 用于对请求频率的限制 limit_conn limit_conn 模块的实现比 limit_req 简单，直接对拥有相同变量值的连接进行计数，超过限制的连接返回 503 错误(Service
The storing and arranging of data in a predefined format so that it can be retrieved and modified in efficient ways is one of the many things that you will want to accomplish, and Data Structures are the building blocks that make it possible. Data Structu
Hashing is a computation technique in which hashing functions take variable-length data as input and
It is common to select certain data or rows from a table. The rows are returned in the order in which they appear in the table. We may sometimes require that the rows we select from the table must be returned to us in ascending or descending order with re
Update command is a data manipulation command which is used to edit the records of a table. It may be used to update a single row based on a condition, all rows or set of rows based on the condition given by the user. It is used along with the SET clause,
Overview We'll learn how to use Linux commands to get the number of occurrences of a specific character in an input file. We're assuming that you know some common Linux commands, including grep, awk, and tr. We'll also suppose that our input file tpoint.t
Overview In this tutorial, we will learn how to find all links for a specific file on Linux. We will use the command lsof to list all files that are opened by any process and then grep to filter out only those files that h**e a link to our target file. Wh
