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Set runlevel on startup on Rocky Linux/Centos/Redhat

Software Effect Enterprises, Inc Posted on February 10, 2022 by SEEIAugust 30, 2022

The following applies to version 7 and higher To have your system start up in text mode systemctl set-default multi-user.target To have your system start up as a graphical target systemctl set-default graphical.target Start in Single User systemctl set-default rescue.target … Continue reading →

Posted in Centos 7, Centos 8, Rocky Linux | Tagged graphical, run level, target, text

SNMP v3 and Cacti

Software Effect Enterprises, Inc Posted on June 13, 2017 by SEEIMay 14, 2022

A quick synopsis on setting up a Cisco ASA and a Centos 6 or 7 system to use SNMP v3 to be monitored by Cacti Cisco ASA en conf t # create a snmp-server group (needed for SNMP v3) # … Continue reading →

Posted in Cacti, Centos, Centos 6, Centos 7, Cisco ASA, Juniper, Linux, SNMP, SRX | Tagged asa, cacti, juniper, linux, snmp, SRX

How to mount raw images (.img) images on Linux

Software Effect Enterprises, Inc Posted on April 7, 2021 by SEEIApril 7, 2021

If you have a few .img files coming as disk images from devices like floppies, CDs, DVDs, SD cards, etc, you will realize that you cannot mount the in Linux, because they contain a file system that has to be … Continue reading →

Posted in Centos, Centos 7, Centos 8, Linux | Tagged file, image, linux, mount

Change port for sshd server

Software Effect Enterprises, Inc Posted on November 11, 2015 by SEEIJanuary 20, 2021

I changed the port for sshd on my servers to reduce the number of attacks against the sshd server. In the following example, I am changing the port from the default of 22 to 43231 First – backup your sshd_config … Continue reading →

Posted in Centos, Centos 6, Centos 7

DRBD on Centos

Software Effect Enterprises, Inc Posted on March 26, 2017 by SEEIDecember 30, 2020

Installation Centos 7 rpm –import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm yum -y install drbd84-utils kmod-drbd84 Centos 6 rpm –import http://elrepo.org/RPM-GPG-KEY-elrepo.org rpm -Uvh http://elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm rpm –import ‘http://keys.gnupg.net:11371/pks/lookup?search=0x0608B895&op=get’ yum -y install drbd84-utils kmod-drbd84 Configuration create /etc/drbd.d/drbd1.res resource repdata { protocol … Continue reading →

Posted in Centos, Centos 6, Centos 7

Could not apply stored configuration to monitors

Software Effect Enterprises, Inc Posted on December 6, 2020 by SEEIDecember 6, 2020

You log onto your linux system and you get the message “Could not apply the sotred configuration to monitors” Start a bash prompt cd ~/.config mv monitors.xml monitors.xml.zzz Log off and log back on again  

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Posted in Centos, Centos 6, Centos 7, Centos 8, Fedora, Mate | Tagged apply, centos, configuragtion, fedora, monitors, redhat

Set Time Zone From ISC DHCP Server

Software Effect Enterprises, Inc Posted on November 5, 2020 by SEEINovember 5, 2020

Hand out the time zone from your ISC DHCP Server Add the following lines to the top of your dhcpd.conf file option PCode code 100 = text; option TCode code 101 = text; option PCode “EST5EDT4,M3.2.0/02:00,M11.1.0/02:00”; option TCode “America/NewYork”;   … Continue reading →

Posted in Centos 7, Centos 8, DHCP

Disable ipv6 on a single interface or all interfaces

Software Effect Enterprises, Inc Posted on January 28, 2019 by SEEIOctober 20, 2020

1. Append below lines in /etc/sysctl.conf: net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 NOTE : To disable IPv6 on a single interface replace “all” on the first line with “eth0” or the name of the selected ethernet interface 2. To make … Continue reading →

Posted in Centos 7

Some Simple FirewallD Examples

Software Effect Enterprises, Inc Posted on August 21, 2017 by SEEIOctober 4, 2020

Using Firewall-cmd to check firewall current state If you want to verify the current state of firewall then you need to use –state option with firewall-cmd command to check that. As you can see from below output, firewalld is currently … Continue reading →

Posted in Centos 7

RDesktop on Centos

Software Effect Enterprises, Inc Posted on November 9, 2015 by SEEIAugust 10, 2020

Centos 7 yum -y install epel-release yum -y groupinstall “GNOME Desktop” yum -y install xrdp xorg-x11-xinit firewall-cmd –permanent –zone=public –add-port=3389/tcp firewall-cmd –reload systemctl start xrdp.service systemctl enable xrdp.service Centos 6 rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm wget -O epel6.key.txt ‘http://keys.gnupg.net:11371/pks/lookup?search=0x0608B895&op=get’ rpm –import epel6.key.txt … Continue reading →

Posted in Centos, Centos 6, Centos 7

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