CentOS Questions

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I've always got questions on some Linux error message, and you probably do too! I may have the answers.

Docker

Docker login on Gitlab error x509: certificate signed by unknown authority

We have some users who are trying to push Docker containers in to a Gitlab registry and their push is being rejected because of an invalid certificate.  This was working last week before doing yum update, upgrading from Gitlab 10.2.x, Read more…

By Jeff Masud, 7 yearsMarch 11, 2018 ago
IPMI

How to setup Serial Console Lan with IPMI on Dell DRAC

I mentioned in one of my earlier blogs that I would give information on to see boot messages using IPMI and SOL.  These are the steps I would normally use.  I’m using a Dell R610 server with a DRAC 5 Read more…

By Jeff Masud, 7 yearsMarch 9, 2018 ago
Centos

Yum update is giving [Errno 14] problem making ssl connection

If you’re running a version of CentOS 6 that is a little older you’re probably running into some SSL certificate and TLS problems.  The errors would looks something like this: [Errno 14] problem making ssl connection Just upgrade your SSL Read more…

By Jeff Masud, 7 yearsMarch 7, 2018 ago
Centos

Adding SolusVM node gives Volume Group not found

I installed a new node we’re adding to the SolusVM cluster, however after finishing the SolusVM install script and we went to the admin to add the server, I got the following error: Volume Group not found After looking around Read more…

By Jeff Masud, 7 yearsMarch 5, 2018 ago
Centos

Can yum show different versions of packages?

Can yum show different versions of packages? In a few situations I need to install an older version of a package.  But the question is always what is the actual version that is available in the repo? This is how Read more…

By Jeff Masud, 7 yearsMarch 5, 2018 ago
Centos

Enable IPv6 on SolusVM

I had to replace a host on our SolusVM cluster, and I created a new host and went to restore some VPS servers.  Everything looked good, I was able to login and see all the VPS servers running but found Read more…

By Jeff Masud, 7 yearsMarch 3, 2018 ago
Centos

Xen DomU startup errror RTNETLINK answers Device or resource busy

Seems like I’m always working on installing more Xen servers.  We use SolusVM for our virtualization.  Today I working on another node for a customer and ran into an issue. I installed a new CentOS 7 and perform the steps Read more…

By Jeff Masud, 7 yearsMarch 1, 2018 ago
Centos

Xen Hardware Dom0 crashed rebooting machine

Trying to get another CentOS 7.4 server running with Xen and getting another error. This initially looks like a previous error I has been getting where the screen goes blank from Xen Hypervisor won’t boot blog.  However I was able Read more…

By Jeff Masud, 7 yearsFebruary 27, 2018 ago
Centos

How to secure erase a drive on Centos?

I’ve always got drives after a client leaves that we want to erase to make sure their data is gone for good and not recoverable by the next person renting the server. This is how I do it.  I first Read more…

By Jeff Masud, 7 yearsFebruary 25, 2018 ago
Juniper

Juniper EX4200 does not recognize SFP module

I have a Juniper EX4200 with a EX-UM-2X4SFP uplink module, and it’s not recognizing the SFP module I’m trying to connect to Single Mode Fiber. This is my hardware run show chassis hardware I can see the fiber card and Read more…

By Jeff Masud, 7 yearsFebruary 23, 2018 ago

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