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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

Move a virtual machine from one Centos machine to another

Software Effect Enterprises, Inc Posted on August 27, 2015 by SEEIJuly 25, 2020

Revised: How to migrate a kvm guest from one host to another. These instructions are for moving a guest machine from one host to another host where the storage is on the host (instead of external storage that can be … Continue reading →

Posted in Centos 6, Centos 7, Libvirt

Adjust Certwatch warning period

Software Effect Enterprises, Inc Posted on March 23, 2020 by SEEIMarch 23, 2020

I set up my LetsEncrypt renewal cron to run just once a week. This causes certwatch to trip because it is set to alarm on any cert that needs to be renewed in < 30 days. to adjust the Certwatch … Continue reading →

Posted in Apache, Centos 7, httpd, LetsEncrypt | Tagged apache, centos, certwatch, httpd, letsencrypt

Recover lost root password on Centos / Redhat version 7 or 8 systems

Software Effect Enterprises, Inc Posted on February 27, 2020 by SEEIFebruary 27, 2020

  You will need console access – either a physical keyboard and monitor locally, or using the Virtual Machine remote console. You will need to be able to control the boot process. Reboot the machine. When the bootloader selection screen … Continue reading →

Posted in Centos 7, Centos 8 | Tagged centos, lost, password, redhat, root

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