Traditionally, network interfaces in Linux are enumerated as eth[0123…], but these names do not necessarily correspond to actual hardware slots, PCI geography, USB port number, etc. This introduces a unpredictable naming problem (e.g., due to undeterministic device probing behavior) which can cause various network misconfigurations (e.g., disabled interface or firewall bypass resulting from unintentional interface […]
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Usually one of the first things we want to do with a new server is to restrict access to SSH -service. So far it seems that everyone advices “disable firewallD, install iptables service and use it like you’ve always used” but how about trying to get along with this new tech? Restricting access to […] Logical Volume Snapshots Objective: Creating and restoring manual logical volume snapshots. Environment: CentOS release 6.3 (32-bit). Descriptions: By LV snapshot you will be able to freeze your logical volumes. In other words, you can easily backup and rollback to a original logical volume state. This is almost similar to VMware where you can the snap […] Kernel Crash Report/Crash Dump Analysis In my previous post, we have configured how to capture kernel dump for reference click on the link kernel crash dump Here in this article,we master the basic usage of crash utility to open the dumped memory core and process the information contained therein and to intercept the output. […] When you boot a Centos server, it defaults to showing a splash screen when booting. You can press escape to switch to a more verbose boot mode. This article describes how to set verbose as the default boot mode. Booting Centos in verbose mode Login as the root user en edit the Grub menu. […] We had few of the servers which was similar in file systems, disk partitions, applications, etc .., but was exception in only Volume Group(VG). So I had cloned the systems and thought of renaming the VG, but since root Logical Volume(LV) was configured on the same VG was unable to un-mount online. I had to […] How to remove if your typed password or sensitive information in your command console. [root@linux1 ~]#history 1 history 2 mypassword 3 otherpassword 4 ls -la 5 sudo rm -f /home/ Remove sensitive command with numbered entry. [root@linux1 ~]#history -d 2 [root@linux1 ~]#history 1 history 2 otherpassword 3 ls -la 4 sudo rm -f /home/ […] How to Change Username in Linux -l, –login NEW_LOGIN The name of the user will be changed from LOGIN to NEW_LOGIN. Nothing else is changed. In particular, the user´s home directory name should probably be changed manually to reflect the new login name. Example: Change existing username account from alice to tom: usermod -l <new_login> […] DESCRIPTION This module maintains a count of attempted accesses, can reset count on success, can deny access if too many attempts fail. pam_tally2 comes in two parts: pam_tally2.so and pam_tally2. The former is the PAM module and the latter, a stand-alone program. pam_tally2 is an (optional) application which can be used to interrogate and manipulate […] find Unauthorized SUID/SGID System Executables and fix them. The following command discovers and prints any setuid or setgid files on local partitions. Run it once for each local partition PART: # find PART -xdev \( -perm -4000 -o -perm -2000 \) -type f -print If the file does not require a setuid or setgid […] |
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