nvrthles

الله

[nvrthles @nvrthles_]

@cloclodma I actually have two clusters.

[nvrthles @nvrthles_]

@cloclodma https://t.co/bEaBdblEiO

[nvrthles @nvrthles_]

@SumitM_X Main bottle neck for DB is not CPU but I/O. CPU maybe helps complex query processing

[nvrthles @nvrthles_]

@__karnati Depends on the start-up but 1 is a good option

[nvrthles @nvrthles_]

@wholyv Python is not the speed bottleneck.

[Branko @brankopetric00]

You have a `StatefulSet` (MongoDB) running on Kubernetes.

The node crashes physically.

Kubernetes sees the node as `NotReady`.

However, it does *not* reschedule the Pod to a different node. The pod stays `Terminating` forever.

Why does Kubernetes refuse to force-move a StatefulSet pod when the node is unreachable, and what specific command must you run to unlock it?

[nvrthles @nvrthles_]

@SumitM_X Do an active standby setup using a VIP

[Akhilesh Mishra @livingdevops]

Early in my DevOps career, I deleted a 5GB log file from a production server that was running out of space.

I ran df -h expecting to see the disk usage drop. It didn’t.
Still showed 100% full.

No errors, no warnings. Just the same disk usage as before I deleted anything.

That’s when I learned that deleting a file doesn’t always free up space immediately.

In Linux, what we think of as a “file” is actually two separate things: the filename (which is just a pointer) and the inode (which contains the actual data and metadata). When you delete a filename, you’re only removing the pointer. The inode and its data remain on disk as long as any process still has the file open.

In my case, the web server was still writing to that log file. Even though I had deleted the filename, the server process kept its file handle open. The inode stayed alive, invisible to normal file listings but still consuming disk space.

The space was only freed when I restarted the web server, which closed all its file handles.

This is why you need different commands to see the full picture:

# Check filesystem usage
- df -h

# Check actual directory sizes
- du -sh /var/log/*

# Find deleted files still open by processes
- lsof +L1

The du command shows you what’s actually using space in directories, while df shows filesystem-level usage.

When they don’t match, you often have deleted files still held open by running processes.

This is also why proper log rotation doesn’t just delete files. Tools like logrotate rename files and send signals to processes so they can close and reopen their file handles cleanly.

Three key takeaways:

1. Filenames are just pointers to inodes
1. Deletion only happens when no processes reference the inode
1. Always check both df and du when troubleshooting disk space

It’s a small detail, but understanding it can save you from confusing production incidents.

[Branko @brankopetric00]

Linux Interview Question:

Explain the difference between a Hard Link and a Soft (Symbolic) Link.

If I delete the original file:
1. What happens to the Hard Link?
2. What happens to the Soft Link?

Why can't you create a Hard Link across different filesystem partitions?

[nvrthles @nvrthles_]

@NaijaFlyingDr Waiting for the Nigeria economic outlook.

[The Elbildad 🇳🇬埃尔比 @Elbildad]

Yaufa na samo muku labarin yadda aka kafa sunayen Abuja da Suleja. Ba yadda kuka Saba ji ba.

[nvrthles @nvrthles_]

@zackdfilms1 It's just cache invalidation.

[nvrthles @nvrthles_]

@_ManLikeAJ Same guy that deposed shagari on corruption. May Allah forgive us and not test our self righteousness.

[nvrthles @nvrthles_]

@xsokari @OneJoblessBoy Over explains and creates more questions for inexperienced minds.

[nvrthles @nvrthles_]

@iOccupyNigeria @OneJoblessBoy That was done in the 2021 finance act. Banks report transactions of individuals within a threshold.

[nvrthles @nvrthles_]

@Covenant2222 @FIRSNigeria They file NIL

[nvrthles @nvrthles_]

@ruffydfire He's right.

[nvrthles @nvrthles_]

@asmah2107 Move that to the infrastructure WAF that's trained on normal traffic to detect abnormalities

[nvrthles @nvrthles_]

@parkersity_9 Check the network layer.

[nvrthles @nvrthles_]

@MahmudRibadu Issue has been base station power. @NgComCommission discussing solutions.