记录湖北移动襄阳云计算中心日常工作关于系统运维,虚拟化云计算,数据库,网络安全等各方面问题。
CentOS 7's new firewalld service Oliver Pelz December 2015  In this article by Oliver Pelz, author of the book, CentOS 7 Linux Server Cookbook, Second Edition, we will learn the fundamentals of CentOS7’s new default firewall service firewalld. A firewall is a program that monitors and controls your system's network interfaces' incoming and outgoing network traffic, and can restrict the transmission to only useful and non-harmful data in and out of a computer system or network.By default, CentOS is made available with an extremely powerful firewall called netfilter, which is built right into the kernel. While in older versions of CentOS we used the famous iptables application to control it, in version 7, the new standard netf...
RHEL 7 / CentOS 7: How to get started with Firewalld Hello All,Today I was trying to learn and know about Systemd. I have found one of the great Article about firewalld, Sharing with you guys, It will help you to understand this biggest and major change in RHEL and CentOS 7.This article is not mine, I found on internet and felt that this is wonderful Article so Sharing with you all, Thanks to Original author, Given credit to him at the end of article.firewalldPresentationFirewalld is the new userland interface in RHEL 7. It replaces the iptables interface and connects to the netfilter kernel code. It mainly improves the security rules management by allowing configuration changes without stopping the current connections.To know if Firewalld is running, type:# systemctl status firewalld firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled) Active: active (running) since Tue 2014-...
How To Install Snort NIDS On CentOS 7 IntroductionThere are few and straight forward administration guides are available for snort on the web. Today, we will try to explain anatomy of snort step by step. Snort is an NIDS (Network Intrusion and Detection System) used to detects and prevent intrusions over the network. Through protocol searching, content analysis and various preprocessors, snort detects thousands of worms and vulnerability attempts. Snort comes with an excellent feature including detection of various types of attacks, buffer overflow, stealth port scan, CGI Attacks etc.Configuration file of Snort configuration is /etc/snort/snort.conf in which information of network under investigation is determined.Sample configuration fileSnort can be configured in three modes.A. Sniffer ModeOutput will dump to the terminal in this mode, it is used to display packets in continuous flow to the user in live mode, in live mode or sniffe...
How to configure DRBD On CentOS 6.5 IntroductionThe Distributed Replicated Block Device (DRBD) is a distributed replicated storage system for the Linux platform. It is implemented as several userspace management applications and some shell scripts and is normally used on high availability (HA) computer clusters. DRBD refers as well to the logical block devices provided by the scheme and to software that implements it. The DRBD software is free software released under the terms of the GNU General Public License version 2. DRBD is part of the Lisog open source stack initiative. Distributed Replicated Block Device is actually a network based RAID 1. If you need to secure data on certain disk and are therefore mirroring your data to another disk via network, you have to configure DRBD on your system.In this tutorial, let us see how to install and configure DRBD on CentOS 6.5.Requirements– Two disks  (preferably same size)– Networking b...
How To Configure A High Available Load-balancer With HAProxy And Keepalived This tutorial explains how to set up a two-node load balancer with HAProxy and keepalived on CentOS 7. The load balancer sits between the user and two (or more) backend Apache web servers that hold the same content.  If one of them is down, all requests will automatically be redirected to the remaining backend server. which means the users will not notice any disruption of the service.For configuring HA-Load balanceer, You need 2 virtual/physical servers for the load-balancers and 2 virtual/physical servers to load-balance. In addition to the 4 IP addresses needed by the servers themselves, a fifth virtual IP address (VIP) is necessary. The two load-balanc...
Install Oracle Database 12c On CentOS7 In this tutorial, we will show you how to Install Oracle Database 12c On CentOS 7OS information:[[email protected] ~]# cat   /etc/centos-release CentOS Linux release 7.0.1406 (Core) Network:[[email protected] ~]# ip a   | grep inet    inet 127.0.0.1/8 scope host lo     inet6 ::1/128 scope host     inet 192.168.119.139/24 brd 192.168.119.255 scope global dynamic eno16777736     inet6 fe80::20c:29ff:fe41:1494/64 scope link Login as root and add required groups: /usr/sbin/groupadd -g 501 oinstall /usr/sbin/groupadd -g 502 dba /usr/sbin/groupadd -g 503 operAdd user Oracle:/usr/sbin/useradd -u 502 -g oinstall -G dba,oper oracleChange password for user:passwd oracleAdd kernel parameters to /etc/sysctl.conf. kernel.shmmni = 4096 kernel.shmmax = 4398046511104 kernel.shmall = 1073741824 kernel.sem = 250 32000 100 128 fs.aio...
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