Sysadmin Mega Thread

sanfordvdev · October 5, 2019, 2:17am

His zfs and ssh books are amazing. Apparently the PAm one is good to

oO.o · October 5, 2019, 2:20am

~~Which one is the PAM one?~~

sanfordvdev · October 5, 2019, 2:26am

I like to watch his Michigan Linux Meetups Talks also.

oO.o · October 5, 2019, 3:37am

The BSD guys have the best presentations.

mutation666 · October 5, 2019, 12:09pm

RIP FFFFFFFFF its not under warranty they arent that old of a pannel

_hill · October 7, 2019, 6:59pm

Network Setup Opinions Networking

So networking is definitely my weakest field in IT as a sysadmin. I am currently planning the implementation of some new hardware and have some protocol questions. Below is the basic setup[image] My main reason for posting is to gather opinions… Option 1: L3 the MX84 (firewall, VPN device) and L2 the 2 switches connected then to rest of network. My concern with option 1 is… I don’t see how I could be setting up VLANs when the mx84 only has about 12 ports and I only want the 2 switches connected. Option 2: L2 the Meraki MX84, then L3 the 2 switches to easily configure VPNs and let the Meraki focus on VPN and security. Option 3: L3 ALL of the devices, and set 1 switch to statics and 1 to DHCP and seperate zones within… I feel like having L3 connected to L3 is a no no, since I have yet to see any documentation or recommendations on doing something like this. Any advice is appreciated.

Might as well loop this in see what other sysadmins think

SgtAwesomesauce · October 7, 2019, 7:02pm

Networking is my weak spot as well. Wish I could help.

_hill · October 7, 2019, 7:32pm

Lol seems like a common problem for us.

SgtAwesomesauce · October 7, 2019, 7:33pm

This is the abstraction problem.

Things get easier, more automated, more levels of abstraction and slowly the people who know how to handle the underlying stuff age out/kick it.

This is why I cringe when I see things like writing microservices in java

oO.o · October 7, 2019, 9:08pm

Not all of us thankfully. Glad to see @mutation666 was able to help you out.

mutation666 · October 7, 2019, 10:57pm

I am not the best designer, but am decent at fixing things / understanding how to fix broken shit

_hill · October 8, 2019, 3:15am

Yeah that’s where I’m at. I’ve transferred from a mainly fixing existing shit role to now I have to basically re-do and design everything.

Exciting and challenging. I’m having to relearn network basics all over again. My CCNA for dummies book is really coming in handy.

I never realized how easy it is to stagnate and grow out of practice. Just putting Fedora on my new laptop I had to google the fdisk command because the last time I used it was a year ago.

AnotherDev · October 8, 2019, 10:35am

That’s my life’s work you son of a gun, take it back.

Howdy sysadmin thread. Not to Jynx myself or put the black curse but I have two dev interviews this week. I want to say it’s been a pleasure. You’ve been good to me

SgtAwesomesauce · October 9, 2019, 12:51am

I’ve just experienced an interesting issue. mdadm failed to start my /home array. (raid0 fite me) It gave me an error in dmesg:

[  666.293291] md/raid0:md127: cannot assemble multi-zone RAID0 with default_layout setting
[  666.293292] md/raid0: please set raid.default_layout to 1 or 2

I fixed it with:

echo 1 > /sys/module/raid0/parameters/default_layout

But I’m curious, does anyone know why this happened? I had a simple kernel upgrade and this suddenly starts happening.

Mastic_Warrior · October 9, 2019, 6:49am

Rework to the FS drivers. What was the file system on those disks? BTRFS, F@FS, and EXT4 have had some rework/cleanup done.

_hill · October 9, 2019, 7:59pm

Well had a fun couple days trying to resurrect a server for a temporary AD backup…

Just heavily reinforced my mindset that you should almost always re-install Windows if you plan on repurposing hardware.

After doing everything humanly possible to restoring windows to normal because it refused to boot from a CD or USB I go to make domain controller and get errors. Basically windows still likes to believe its on a domain even if you change back to workgroup and tell it no, you are not.

So now after 2 days of work, updates and wiping here I am putting in a hard drive with the ISO on it just to re-install windows. Also had to scrape the key because all docs are nonexistent for the server.