Featured »

March 2, 2022 – 2:00 pm

Books have been written on the subject of awk and sed. Here’s a small sample of commands I put together over the years that are useful for everyday system administration tasks. Most of these tasks …

Read the full story »
Networking

Unix and Linux network configuration. Multiple network interfaces. Bridged NICs. High-availability network configurations.

Applications

Reviews of latest Unix and Linux software. Helpful tips for application support admins. Automating application support.

Data

Disk partitioning, filesystems, directories, and files. Volume management, logical volumes, HA filesystems. Backups and disaster recovery.

Monitoring

Distributed server monitoring. Server performance and capacity planning. Monitoring applications, network status and user activity.

Commands & Shells

Cool Unix shell commands and options. Command-line tools and application. Things every Unix sysadmin needs to know.

Home » Archive by Month

Article Archive for April 2019

Adding and Removing sshd instances on CentOS 6

April 20, 2019 – 8:24 pm
Photo-2019-03-25-20-44-06_2465

This is a process and a couple of script to allow you to setup an additional sshd service on an alternate port.

Creating a Chroot Jail for SSH Access

April 17, 2019 – 4:51 pm
Photo-2019-03-25-16-55-55_2462

Just a quick collection of notes on – rather than a definitive guide to – setting up an SSH chroot jail on RHEL 6. The same should work on RHEL 7 and unrelated flavors. For …

The Unix Oriental

April 14, 2019 – 4:16 pm
17516F9C-988D-4D42-A460-6E4D9C9F5A27s

Placed quite appropriately in the “Security” category – my favorite Oriental cocktail recipe. Distinguishing it from the classic preparation, are absence of sweet vermouth and lime juice, as well as addition of just a couple …

Notes on ownCloud configuration

April 12, 2019 – 4:13 pm
Photo-2019-03-22-23-20-20_2454

The ownCloud file sharing application has been around for some time now, but somehow evaded my attention. My limited imagination makes me say “think of it us Dropbox hosted on the server in your basement”.

Encrypting Log Data During Log Rotation

April 9, 2019 – 4:12 pm
zbndpnm52bwk2uvwwyu9uomvglc

Most log files do not contain personally-identifiable information or other sensitive data. And even if they do, encryption of all personal data is not mandatory under GDPR. Still, on occasion, for testing and troubleshooting purposes …

DevOps Obfuscation

April 6, 2019 – 4:10 pm
1wwk5j68lvbgnevinwc1w265zqd

Some years ago I’ve been reading “DevOps in Straight English” by Magnus Hedemark  and encountered the Release Frequency vs. Risk chart that supposedly illustrated the advantages of DevOps. It seemed convincing enough to not give …

Gnuplot with Bash

April 2, 2019 – 4:08 pm
4804B26A-4735-42D4-AAA8-AF5DAADA39E9

OK, so both of these things have been around forever and will be around long after we’re gone. It’s worth your time to learn how to use the to together.