Tags » SysAdmin

Installing Red Hat Enterprise Linux 7 on HP Dynamic Smart Array B120i SATA RAID

I have a few HPE ProLiant SL4540 Gen 8 servers that have a hardware RAID controller (HP Dynamic Smart Array B120i SATA RAID) that manages the two node hard disks. 815 more words

System Administration

Mailgun SMTP

Go to https://mailgun.com/app/domains and get:
Default SMTP Login
Default Password

Server: smtp.mailgun.org
Port: 587 (StartTLS)


Let's Encrypt Everything - Setting up the Free, Automated CA

Let’s Encrypt is a free, public SSL certificate authority (CA) you can use to generate and automate SSL certificate renewal.  I co-manage Trystack.org, a… 711 more words

Open Source

DevOps – and the SysAdmin Part 3 - Changes in App Dev Approach / The model changes

When a SysAdmin implements a DevOps approach to their environment, there are many things that need to be considered. Not the least of which is to develop a strong line of communication between the developer and the SysAdmin. 600 more words

Winbind does not reflect AD group membership change

Sometimes, Winbind does not reflect AD group membership change. How to recover from it ?
The below steps have been successfully tested on a Red Hat server : 49 more words


JIRA, Confluence and Lets Encrypt

I recently had to move a JIRA and Confluence environment to a new infrastructure stack. During the move, we also changed the TLS Certificates and instead of using one of the paid-for incumbents we decided to give… 438 more words


How to create overlay networks using Linux Bridges and VXLANs

Some time ago, I learned How to create a overlay network using Open vSwitch in order to connect LXC containers. Digging in the topic of overlay networks, I saw that linux bridges had included VXLAN capabilities, and also saw how some people were using it to create overlay networks in a LAN. 2,020 more words