Programmer Group

Last night, I received Ali Yun's short message and email to persuade the server to be poisoned. The contents are as follows: After testing the malicious outsourcing behavior of your cloud server (ip), in order to avoid affecting the normal use of your server, you must pay attention to it and deal with it as soon as possible. You need to find ou ...

Apache is a web server with the highest usage. A in LAMP refers to it. Because of its open source, stability, security and other characteristics, it is widely used. The previous article has documented how to build a LAMP architecture, which is only the first step. Apache service is the most important one, and it is also the core of LAMP. The ...

Understanding the basic options of sed tools The common options for sed commands are as follows: - n (Shield default output, default sed will output all the contents of the read document) - r (Let sed support extended regularity) - i (sed modifies source files directly, default sed modifies files temporarily only through memor ...

Set remote access, allow class B 192.168.0.0/16 segment access, and set listen_addresses ='*'. The database server is 192.168.126.128. #Modify configuration files [root@promote ~]# vim /var/lib/pgsql/11/data/pg_hba.conf #View Modification Completion Profile [root@promote ~]# egrep -v "^#|^$" /var/lib/pgsql/11/data/pg_hba.conf local all ...

Official documents https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/quickstart-fedora.html Dependency software Before installing nagios, you need to install apache, php, gcc, gd-devel, which can be installed through yum. This article is based on the source code build LAMP architecture (build LAMP)- http://blog.csdn.net/di ...

I. variables Types of variables in shell s 1) Local variables (local variables) 2) Environmental variables (global variables) 3) Location variable 4) Special variables 1. Local variables Also known as custom variables, users define variables according to their own needs Scope: Acts throughout the shell script; if a variable is defined ...

Before importing data Clear demand Understanding data Data quality Import data Supporting multiple data sources text file read.table,read.csv,read.delim scan Excel file csv, prn format + read.csv Clipboard + read.delim xlsx extension package rodbc package Data cleaning Missing Value Processing NA,NaN,Inf,-Inf Identifying missing ...

The Kill Command in Linux is used to terminate the operation of a specified process. It is a common command for process management in Linux. Usually, the Ctrl+C key can be used to terminate a foreground process, but for a background process, we need to terminate with kill command. We need to use tools such as ps/pidof/pstree/top to get the pro ...

(1) Installing freeTDS FreeTDS provides an open source client of TDS protocol for Linux system. Because MS SQL and Sybase use the TDS protocol, they can connect MS SQL with FreeTDS in Linux.Official website: http://www.freetds.orgDownload: wget http://ibiblio.org/pub/Linux/ALPHA/freetds/stable/freetds-stable.tgzInstallation:[root@vm01 ~]# ta ...

Let's first feel the keepalived configuration file without reverse proxy if services are provided separately: (ps configuration is not panicky) vim /etc/keepalived/keepalived.conf vrrp_instance VI_1 { state BACKUP interface ens192 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS ...