CentOS 7.0 uses firewall as the firewall by default, and the previous version used iptables.
Therefore, you cannot view the firewall status by executing the following command in CentOS 7.
[root@localhost ~]# service iptables status
Redirecting to /bin/systemctl status iptables.service
Unit iptables.service could not be found. ...
Posted on Sat, 04 Apr 2020 09:40:53 -0700 by uNF
RabbitMQ Basic Meaning
RabbitMQ is a message middleware that handles asynchronous messages from clients.The message that the server will send is put into the queue pool.Receiver can receive messages from server according to the forwarding mechanism configured by RabbitMQ.RabbitMQ forwards, buffers, and persists messages according to the specifi ...
Posted on Fri, 03 Apr 2020 16:26:39 -0700 by anwoke8204
Firewall policy - port access
If you cannot connect to Mysql remotely, check whether the default 3306 port allows access:
[root@localhost /]# iptables -L -n|grep 3306
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:3306
allow access to
If not, you ne ...
Posted on Fri, 03 Apr 2020 03:22:47 -0700 by jennyp
Server: alicloud server
Operating system: CentOS 6.8
mysql version: 5.5
Download and unzip mysql
1> cd /usr/local/
2> mkdir mysql5.5
3> rz [Select localmysql-5.5.59-linux-glibc2.12-x86_64.tar.gz] ...
Posted on Wed, 01 Apr 2020 19:09:54 -0700 by behzad
Introduction to active information collection
Interacting directly with the target system will not avoid leaving traces of access, using a controlled third-party computer to detect, using a proxy or a controlled machine to scan, sending different probes, and determining the target status based on the returned results
Scan based on TCP/IP model
Posted on Tue, 10 Mar 2020 09:56:58 -0700 by babyrocky1
chrony's program configuration
Basic operation command
Packages of yum install ntpdate are no longer supported by Linux Centos8
chrony is a free and open-source time synchronization software on CentOS 7. X. it can keep the system clock and th ...
Posted on Thu, 05 Mar 2020 00:40:46 -0800 by FrancoPaddy
The previous series of articles essentially covered the basics of linux management, starting with this one about deploying and configuring service programs in centos7 to provide a variety of services to the outside world.
In our daily work and entertainment, all kinds of resources we need are inseparable from the network and various services. W ...
Posted on Thu, 27 Feb 2020 19:04:41 -0800 by oughost
Last article "Design pattern Overview - creation pattern" After sorting out the five types of creation mode, let's go on to sort out the structural mode.
The purpose of a structural pattern is to describe how classes or objects can be combined to form a larger structure. The class structur ...
Posted on Tue, 25 Feb 2020 05:05:05 -0800 by kashmirekat
Mail service configuration (virtual domain & virtual user)
First of all: https://www.somata.work/2019/VirtualMailServerConfig_MariaDB.html
Now what I'm doing is:Linux + httpd + php + mariadb + postfix + dovecot + phpMyAdmin + postfixadmin + roundcubemail
Here I will show you how to make a mail service based on virtual domain and virtual us ...
Posted on Sat, 22 Feb 2020 09:56:35 -0800 by JoeF
Preparation before installation
At least three machines are needed here. All machines turn off the firewall and Selinux. All machines need two hard disks,
systemctl stop firewalld
systemctl disable firewalld
sed -i "s#SELINUX=enforcing#SELINUX=disabled#g" /etc/selinux/config
In fact, ...
Posted on Wed, 19 Feb 2020 01:29:45 -0800 by ojeffery