A concise guide to firewall D on Linux

Firewall D is the front-end controller of iptables, which is used to implement persistent network traffic rules. It provides command line and graphical interfaces, which are available in the repositories of most Linux distributions. There are two main differences between using firewall D and controlling iptables directly: Firewall D uses zone ...

Added by 01706 on Thu, 28 May 2020 07:10:56 +0300

[12c] let you know the collection of Extended Statistics of Oracle 12c database

In the Oracle database, the optimizer needs to rely on the collection of statistical information of related objects in order to generate the optimal execution plan. The database can automatically collect the execution plan or use the package DBMS_STATS is collected manually. This article does not explain the collection of general statistics. It ...

Added by libertyct on Wed, 27 May 2020 15:38:34 +0300

suricata uses pfring to monitor multiple network cards for error analysis and resolution

Problem scenarios We use Suricata for traffic analysis. Suricata is deployed on a 48-core physical machine with a multi-network card. Due to business needs, suricata's network card for monitoring traffic has been upgraded from 5 to 6, enp176s0f1 has been added, and several similar errors have been found in suricata's log: <Error> - [ERRC ...

Added by pandaweb on Tue, 26 May 2020 21:51:27 +0300

HP ssacli tool use

Under the linux system, the disk is replaced, but for the HP array card, the common MegaCli, storcli and percli can not get the disk information. At this time, the special tool ssacli is needed.rpm package download address: https://downloads.linux.hpe.com/SDR/repo/mcp/centos/7/x86_64/current/ View raid card information (including controller st ...

Added by flumpy on Tue, 26 May 2020 19:04:53 +0300

Linux command (28) last command

last command Function Description: display the list of recently logged in users The last command will read the wtmp file under / var/log / and display the user name of the login system recorded in the file. Usage: last option effect -n Set the number of lines to display the list -R Do not display the host name and IP address of the l ...

Added by scott56hannah on Tue, 26 May 2020 18:25:56 +0300

0. Chapter 0 of MySql, installation and cluster configuration

Chapter 0 of MySql, installation and cluster configuration 1, MySql installation 1. RPM installation RPM installation, unable to customize some installation paths and configuration file paths ##Fill in the pit later 2. Generic installation Binary precompiled Generic, download address: https://cdn.mysql.com/archives/mysql-5.7/mysql- ...

Added by khendar on Tue, 26 May 2020 17:54:42 +0300

Linux command (22) useradd command

useradd command Function Description: add user or update default new user information Usage: useradd [options] login_name option explain -u,--uid UID When adding a new user, specify the UID number manually. The default is the UID+1 of the previous user, the UID usage range (CentOS6) 500 +, (CentOS7) 1000+ -g,--gid group_name When a ...

Added by j152 on Mon, 25 May 2020 14:46:35 +0300

How to deal with the problem that the cloud server cannot access the database remotely after it is installed

Today, my colleague said that a new cloud server is installed, and it is normal to log in Using ssh, but the above service port of Dayun database cannot be accessed. Using netstat ANP to view the port is normal to listen, and the listening address is also allowed to be accessed by any ip And the firewall and iptables are both closed I was also ...

Added by Maskeeper on Sun, 24 May 2020 15:00:06 +0300

Installation practice of ansible UI management tool awx

Environmental Instructions: host name os version ip docker version docker-compose version ansible version awx version Remarks ansible-awx Centos 7.6.1810 172.27.34.50 Docker 19.03.9 1.25.5 2.9.9 10.0.0 Manage Nodes centos01 Centos 7.6.1810 172.27.34.28 × × × × Managed Node centos02 Centos 7.6.1810 172.27.34.35 × × × × Managed Node ...

Added by skiingguru1611 on Thu, 21 May 2020 20:34:51 +0300

Five communication modes between processes

Source: https://blog.csdn.net/wh_sjc/article/details/70283843   IPC (InterProcess Communication) refers to the communication or exchange of information between different processes. IPC usually includes pipeline (including nameless pipeline and named pipeline), message queue, semaphore, shared storage, socket, Streams, etc. Soc ...

Added by ValdouaD on Mon, 18 May 2020 09:00:24 +0300