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The file access control lists (FACLs) or simply ACLs are the list of additional user/groups and their permission to the file. Although the default file permissions does their jobs perfectly, it does not allow you to give permissions to more than one user or one group on the same file. How to know when a […] SELinux modes SELinux gives that extra layer of security to the resources in the system. It provides the MAC (mandatory access control) as contrary to the DAC (Discretionary access control). Before we dive into setting the SELinux modes, let us see what are the different SELinux modes of operation and how do they work. SELinux […] When you convert a linear volume to a mirrored volume, you are basically creating an extra mirror copy for an existing volume. This means that your volume group must contain the devices and space for the mirrors and for the mirror log. If losing a copy of a mirror, LVM converts the volume to a […] Introduction – A packet filtering firewall reads incoming network packets and filters (allows or denies) each data packet based on the header information in the packet. The Linux kernel has built-in packet filtering functionality called Netfilter. – Two services are available in RHEL 7 to create, maintain, and display the rules stored by Netfilter: 1. […] NFS allows a linux server to share directories with other UNIX clients over network. NFS server exports a directory and NFS client mounts this directory. RHEL 7 supports two version of NFS – NFSv3 and NFSv4. NFS server and RPC processes starting the nfs-server process starts the NFS server and other RPC processes. RPC processes […] Question : How to disable firewalld and enable iptables instead? Answer : To switch to from firewalld to iptables follow the steps given below. 1. Firstly ensure the iptables-services package is installed. # yum install -y -q iptables-services 2. Then prepare the iptables rules you wish to use by editing /etc/sysconfig/iptables and /etc/sysconfig/ipt6tables. 3. Next, […] Firewalld is the new way of interacting with the iptables rules in RHEL 7. It allows to set new sucurity rules and activate them in runtime without disconnecting any existing connections. Managing firewalld # firewall-cmd –state — Display whether service is running # systemctl status firewalld — Another command to display status of service # […] Why should a Linux boot loader have password protection? The following are the primary reasons for password protecting a Linux boot loader: 1. Preventing Access to Single User Mode – If an attacker can boot into single user mode, he becomes the root user. 2. Preventing Access to the GRUB Console – If the machine […] CentOS / RHEL 7 : Chrony V/s NTP (Differences Between ntpd and chronyd) Chosing between Chrony and NTP – In RHEL 7 ntpd is replaced by chronyd as the default network time protocol daemon. – Basic configuration for synchronize time and date is stored in the file /etc/chrony.conf. – ntpd is still included in yum […] Question : How to sync chrony to the local clock. Answer : When the chrony service starts, there are some settings in the /etc/chrony/chrony.conf file that tells it to actually set the time if specific conditions occur. Below procedure lts you set the local clock as the source for chrony to synchronize the time. 1. […] |
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