The instructions below are assuming you’re logged in as root, if you are logged in as another user remember to prepend sudo to the commands shown below. Install the necessary packages First of all update your server and install the necessary packages using the following commands: yum -y update yum -y install curl libcap-devel yum […]
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Rootkit Hunter (rkhunter) is a Unix-based tool that scans for rootkits, backdoors and possible local exploits. Rootkits are self-hiding toolkits secretly installed by a malicious intruder to allow that user to gain access to the server. Rootkit Hunter offers protection by comparing SHA-1 hashes of important files with known good ones in a online database […] [gview file=”http://rmohan.com/wp-content/uploads/2015/08/7-linux-roadmap.pdf”] [gview file=”http://rmohan.com/wp-content/uploads/2015/08/Red-Hat-7-PPT.pdf”] Partitioning By separating file systems into various partitions, you can fine tune permissions and functionality. Doing so will provide you greater granularity for permissions, as well as adding a layer of security for any potential bad guys to work through. Steve Grubb suggests, and quite rightly so, that areas where users have write privileges be […] Need to add date to bash history, knowing when some commands were fired. Before the change: root@host# history 1 ifconfig 2 ifup eth0 3 ifconfig 4 shutdown -r now root@host# history 1 ifconfig 2 ifup eth0 3 ifconfig 4 shutdown -r now Now, make appripriate changes in your bash profile: echo ‘export HISTTIMEFORMAT=”%d/%m/%y %T “‘ […] Need to change default EXT4 mount options to tweek performance DEFAULT EXT4 mount options (Centos 6.3): Shell [root@server ~]# cat /etc/fstab<br /> dev/sda1 / ext4 defaults 0 1 1 2 [root@server ~]# cat /etc/fstab dev/sda1 / ext4 defaults 0 1 … meaning … Shell [root@server ~]# cat /proc/mounts | grep ext4<br /> /dev/sda1 / […] Purpose The keypair you create will be in the .pem format. If you plan on using PuTTy to SSH to a Linux instance from a Windows computer you will need to convert that keypair file to the .ppk format. This article will show you those steps. Notes Your original private key pair file (.pem) is […] WebSphere MQ is an IBM messaging solution which enable applications to communicate each other asynchronously. Application A for example need not to be connected direct to application B to exchange information moreover application B need not to be running for the application A to communicate. Application A simply place the message in container called queue […] Install Oracle Database 12c On CentOS7 Add a host file entry [root@oracledb ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.1.60 oracledb.rmohan.com oracledb [root@oracledb ~]# hostnamectl Static hostname: oracledb.rmohan.com Icon name: computer-vm Chassis: vm Machine ID: 4145c21ef6ec4ca3a6a4ea34087a5552 Boot ID: a0d067b346df44f98ba7248578bfde3b Virtualization: vmware Operating System: CentOS Linux 7 (Core) CPE OS […] Issue yum update fails with the error : [Errno 256] No more mirrors to try yum update fails with :- Error Downloading Packages: InstallMedia: [Errno 256] No more mirrors to try. yum fails with : Error Downloading Packages: ftp-0.17-35.el5.x86_64:failure:ftp-0.17-35.el5.x86_64.rpm from Red5repo55:[Errno 256] No more mirrors to try. [[6]]” (code -1) Packages Scheduled yum fails […] |
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