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Linux Servers Prevent Pings and Open Pings

Linux defaults to allow ping responses, which means that ping is on, but ping may be the start of a network attack, so turning off ping can improve the server’s security factor. Whether the system allows ping is determined by two factors: 1. Kernel parameters, 2. Firewall. Two factors are required to allow ping at the […]

Linux configuration ssh remote remote login

This configuration allows you to: ssh logins between cluster servers. If you only want to ssh login from other machines (slave1, slave2) from a single machine (such as master), only follow the second step.

It is recommended to spend two or three minutes to read the full text and then follow the steps


1. Cluster […]

Yum (Yellowdog Update Modified)

Patching a server is an important task for Linux system administrators in order to make the system more stable and perform better. Manufacturers often release some security / high-risk patches, the software needs to be upgraded to guard against potential security risks.

Yum (Yellowdog Update Modified) is an RPM package management tool used on CentOS […]

Linux to achieve SSH password-free remote access server

Linux to achieve SSH password-free remote access server


Usually use SSH login remote server, you need to use the input password, hoping to achieve through the key login and exemption from the input password, which can be achieved for the future batch automatic deployment of the host to prepare.

The environment is as follows:


docker on Centos 7

Install Docker

[root@clusterserver3 /]# yum -y install docker Loaded plugins: fastestmirror base                                                                                                                                                                      | 3.6 kB  00:00:00 extras                                                                                                                                                                    | 3.4 kB  00:00:00 updates                                                                                                                                                                   | 3.4 kB  00:00:00 Loading mirror speeds from cached hostfile * base: mirror.nus.edu.sg * extras: mirror.nus.edu.sg * updates: mirror.nus.edu.sg Resolving Dependencies –> Running transaction check —> Package docker.x86_64 0:1.8.2-10.el7.centos will be installed –> […]

Counting number of users in a group – Linux

Counting number of users in a group – Linux

Here is a small command to find number of users in particular group on a *nix system. An example for wheel group:

grep wheel /etc/group | fgrep -o , | wc -m

Now here’s a catch, this command actually counts the commas in the line from […]

Redis test

$ make test You need tcl 8.5 or newer in order to run the Redis test make: *** [test]

rpm -qa | grep tcl

yum install tcl


Technically at the moment there isn’t anything really wrong with the SHA-1 hash function, but it is now quite old and is starting to show potential cracks. Hence the reason that the security industry is advising to move to something better. In this case SHA-256.

1. Generate a SSL Key File

Firstly you will need […]

Boot Partition Full ( CentOS 7 )

Boot Partition Full ( CentOS 7 )

root@RHEL7HARDEN:~# df -h

Filesystem            Size  Used Avail Use% Mounted on /dev/mapper/vg0-root   96G   15G   77G  16% / devtmpfs              3.8G     0  3.8G   0% /dev tmpfs                 3.8G  152K  3.8G   1% /dev/shm tmpfs                 3.8G  9.1M  3.8G   1% /run tmpfs                 3.8G     0  3.8G   0% /sys/fs/cgroup /dev/sda1             283M  270M     0 100% /boot /dev/mapper/vg0-home  577G  […]

Verify Package Integrity Using RPM

Verify Package Integrity Using RPM

The RPM package management system includes the ability to verify the integrity of installed packages by comparing the installed files with information about the files taken from the package metadata stored in the RPM database.

Although an attacker could corrupt the RPM database (analogous to attacking the AIDE database […]

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