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Category Archives: Centos 7

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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

systemctl restart someservice returns “Error: No space left on device”

Software Effect Enterprises, Inc Posted on February 3, 2020 by SEEIFebruary 3, 2020

If you have sufficient disk space and you are running Code42/Crashplan pro and you get “Error: No space left on device” when you use systemctl, this may be the fix Linux performs real-time file watching using the inotify API. Inotify … Continue reading →

Posted in Centos 7 | Tagged code42, Crashplan Pro, no space left on device

Turn off wifi radio in Linux / Centos

Software Effect Enterprises, Inc Posted on January 28, 2020 by SEEIJanuary 28, 2020

I have a few boxes that have built in wifi and I dont need it turned on. So I turn it off using the following command nmcli radio wifi off To make sure the wifi radio stays turned off in … Continue reading →

Posted in Centos 7, Linux, wifi | Tagged linux, wifi

SSH WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

Software Effect Enterprises, Inc Posted on December 22, 2019 by SEEIJanuary 3, 2020

You go to ssh to a system and you get the following message @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: POSSIBLE DNS SPOOFING DETECTED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ The ECDSA host key for server.domain.com has changed, and the key for the corresponding IP address 10.128.15.2 is … Continue reading →

Posted in Centos, Centos 6, Centos 7, ssh | Tagged host, remote, ssh

Route email destined for a selected domain to /dev/null

Software Effect Enterprises, Inc Posted on December 31, 2019 by SEEIDecember 31, 2019

I wanted to do some testing with some forms on my web site, but I did not want to deal with the resultant output going to email. I added the following line to the /etc/postfix/transport file fubar.com   discard Then I … Continue reading →

Posted in Centos 7 | Tagged /dev/null, postfix

Installing MATE on CentOS 7

Software Effect Enterprises, Inc Posted on September 24, 2015 by SEEINovember 27, 2019

First install the EPEL-repositories then install the X Window System yum -y install epel-release yum -y groupinstall “X Window system” Install the MATE packages. This will take a few minutes yum -y groupinstall “MATE Desktop” Tell your system to start … Continue reading →

Posted in Centos 7

Show available wifi networks

Software Effect Enterprises, Inc Posted on November 18, 2019 by SEEINovember 18, 2019

nmcli dev wifi nmcli -f ALL dev wifi For more information see here

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Posted in Centos, Centos 7, Centos 8 | Tagged network, wifi

How to disable PackageKit on CentOS 7

Software Effect Enterprises, Inc Posted on October 1, 2019 by SEEIOctober 1, 2019

Problem: You go to install a package with yum command on CentOS and you get the error saying that “Another app is currently holding the yum lock; waiting for it to exit… The other application is: PackageKit”. PackageKit get launched … Continue reading →

Posted in Centos 7 | Tagged packagekit, yum

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