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Category Archives: Centos 7

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Change timezone in Centos 7

Software Effect Enterprises, Inc Posted on June 3, 2019 by SEEIJune 3, 2019

You set up a machine – but you set the wrong timezone, how to fix it? First confirm the current timezone [root@mysystem ~]# date Mon Jun 3 09:08:58 CDT 2019 We will use the tool timedatect to change it. Now … Continue reading →

Posted in Centos 7

See what is going on as your Centos 7 system boots

Software Effect Enterprises, Inc Posted on June 3, 2019 by SEEIJune 3, 2019

I have had some problems with kernels, modules, drivers, services, etc causing Centos to lock up when the system boots. This is real annoying when it has that nice fancy graphical grey screen up with the spinning device at the … Continue reading →

Posted in Centos 7, grub

Testing a TFTP server using Cenots 7

Software Effect Enterprises, Inc Posted on May 20, 2019 by SEEIMay 20, 2019

First su – yum -y install tftp If you are running iptables either: iptables -I INPUT -s ip.address.tftp.server -p udp -m udp –dport 2000:2020 -j ACCEPT 0r systemctl stop iptables If you are running firewalld Execute the command to permit … Continue reading →

Posted in Centos 7 | Tagged tftp

Stop firefox from forcing https://

Software Effect Enterprises, Inc Posted on May 1, 2019 by SEEIMay 1, 2019

I have to deal with some older printers that dont have https:// set up on them – but every time I try to access them using Firefox – it changes the URL from http://printername.or.ip to https://printername.or.ip First – in the … Continue reading →

Posted in Centos 7, Firefox

Find the PID and Names of Virtual Machines on Centos 7

Software Effect Enterprises, Inc Posted on April 12, 2019 by SEEIApril 12, 2019

On my Centos 7 system, I wanted to find out which VM was taking up a large amount of the processor: top – 14:43:15 up 3 days, 7:49, 2 users, load average: 1.66, 1.79, 1.99 Tasks: 442 total, 1 running, … Continue reading →

Posted in Centos 7, Libvirt

ssh fails to connect with debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

Software Effect Enterprises, Inc Posted on November 11, 2018 by SEEINovember 11, 2018

Running ssh across a vpn connection I started having my ssh sessions fail to connect. After starting ssh with the “-vvv” option, the session would timeout after getting a debug1: expecting SSH2_MSG_KEX_ECDH_REPLY After doing some research, I found other people … Continue reading →

Posted in Centos, Centos 6, Centos 7, Cisco ASA, Linux, ssh

Auto logon with Gnome 3 / Centos 7

Software Effect Enterprises, Inc Posted on September 7, 2018 by SEEISeptember 7, 2018

Note: You need supervisor privileges to make this change. Select the power icon in the upper right corner. Select your username from the drop down list Select Account Settings form under your username Select the Unlock button at the top of … Continue reading →

Posted in Centos 7

Select Boot Kernel In Centos 7

Software Effect Enterprises, Inc Posted on October 10, 2016 by SEEIAugust 20, 2018

Update!! Use these instructions instead:  https://docs.fedoraproject.org/en-US/Fedora/23/html/System_Administrators_Guide/sec-Configuring_GRUB_2_Using_the_grubby_Tool.html       A typical CentOS 7 Linux system has multiple kernels. How many kernels you have in your CentOS systems depends on the configuration setting. Sometimes you might feel the need to change the … Continue reading →

Posted in Centos 7

Custom logon prompt for getty

Software Effect Enterprises, Inc Posted on August 1, 2017 by SEEIJuly 16, 2018

Fix your logon prompt for when you are on the console of your Linux server (Centos 6 runlevel 3 or Centos 7 multi-user.target) so that it displays your current ip address Edit /etc/rc.d/rc.local and add the following lines to the end … Continue reading →

Posted in Centos 6, Centos 7

KVM, QEMU start or stop virtual machine from the bash prompt

Software Effect Enterprises, Inc Posted on May 30, 2018 by SEEIMay 30, 2018

To start or stop virtual machines using ssh or the console, you will need to use the bash prompt. There is more than one way, but this is the way I prefer First check which virtual machines are available: virsh … Continue reading →

Posted in Centos 7, Libvirt

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