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In today’s article we will guide you through the process of installing mod_security with the OWASP (Open Web Application Security Project) core rule set on a CentOS 7 from source. ModSecurity is a web application firewall engine that provides very little protection on its own. In order to become useful, ModSecurity must be configured with […] When Linux system first boots the hardware clock is read first. The time on the hardware clock read from local hardware clock in UTC – Universal Time. Local time is the actual time in the current time zone. System time, unlike Hardware clock maintained by operating system. System clock is completely independent of the hardware […] Many open source p[projects require LAMP with database and database user ready to go. Here we will look at basic commands on CentOS7 to get it up and running quickly. After CentOS7 installed update all packages yum update -y Install apache web server yum install httpd Start service and enable it to start on boot […] OpenSSH server is the standard SSH client and server. OpenSSH is suggested for remote login, transfer file by means of SCP or SFTP, and a much more. SSH is perfect to keep confidentiality and integrity for data exchanged between two systems and networks. OpenSSH encrypts all traffic and password to effectively eliminate with assaults. In […] Open vSwitch installation on CentOS 7.2 Open vSwitch (OVS) is a production quality, multilayer virtual switch software available for various platforms. The server platforms include x86 based latest Linux distributions e.g. Debian 16 LTS or CentOS 7.2. Popular SDN switch operating system development company Pica8 also bundles the OVS in a custom Ubuntu version for […] expect,sshpass,pash rpm -qa expect yum install expect -y useradd mohan echo 123456|passwd –stdin mohan su – mohan ssh-keygen -t dsa -P ” -f ~/.ssh/id_dsa >/dev/null 2>&1 yum install lrzsz -y cat mohan_sshkey.exp #!/usr/bin/expect if { $argc !=2 } { send_user “usage: expect mohan_sshkey.exp file host\n” exit } […] CentOS 7 Change Network Interface Name From Eno* To Eth0 After you installed CentOS 7.0 or RHEL 7.0 system, you maybe notice that the default name of network interface was changed from “Eth*” to “Eno*”. How do I change network interface name to “Eth0? in CentOS 7.0? This post will show you the ways to […] GlusterFS servers on RHEL 7 and Centos 7 vi /etc/hosts 192.168.1.71 apache1.rmohan.com apache1 192.168.1.72 apache2.rmohan.com apache2 192.168.1.74 apache3.rmohan.com apache3 For this lab, we disabled both firewall and SELinux vi /etc/selinux/config egrep “^SELINUX=” /etc/sysconfig/selinux SELINUX=disabled systemctl is-enabled firewalld disabled systemctl disable firewalld yum update yum -y install wget openssh* net-tools ntp ntpdate -u 0.centos.pool.ntp.org […] Resolution pvresize is a tool to resize Physical Volume which may already be in a volume group and have active logical volumes allocated on it. Expand the PV on /dev/sda1 after enlarging the partition with fdisk: pvresize /dev/sda1 Shrink the PV on /dev/sda1 prior to shrinking the partition with fdisk (ensure that the PV size […] e defaults in the various RHEL version differ and the current default can be found in manual page for sshd_config. For example RHEL6: The default is: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128, aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc, aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se You can remove the CBC ciphers by adding the line for RHEL7: Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,arcfour The line for RHEL6: Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,arcfour The line for RHEL5 (note the […] |
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