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Specifying the Kernel to Use on Reboot in Grub2

(by ChatGPT)

You can specify which kernel to use at reboot. Here are a few options to achieve this:

---

1. Temporarily Specify the Kernel for the Next Reboot

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Get box drive path from box page

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Detecting TRIM Commands with kprobe:blk_mq_start_request

(by ChatGPT)
This document describes how to use bpftrace and the kprobe:blk_mq_start_request probe to monitor TRIM (discard) operations issued by the Linux kernel I/O scheduler.

✅ What It Does

The following bpftrace script hooks into the blk_mq_start_request(struct request *rq) kernel function and checks if the request is a discard (TRIM) operation. If so, it prints the target device name.

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bash history preferences

HISTCONTROL=ignorespace:ignoredups:erasedups
HISTSIZE=100000
HISTFILESIZE=100000

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Backup Slack Log

slackdump

Tool: rusq/slackdump
Description: Save or export your private/public Slack messages, threads, files, and users locally without admin privileges.

version: 3.0.10 and 3.1.1

1. Get Token and Cookie

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nextcloud setup

version

Item	Value
Nextcloud	31.0.4
MariaDB	11.4
elasticsearch	8.18.0
Collabora Office	25.04.1.1

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nice web mail server

Roundcube - Free and Open Source Webmail Software

• Web UI. mobile browser ready.
• easy to setup with docker
• exploits IMAP search for FTS search

docker run -e ROUNDCUBEMAIL_DEFAULT_HOST=hostname -e ROUNDCUBEMAIL_SMTP_SERVER=hostname -p 8000:80 -d --name roundcubemail --rm roundcube/roundcubemail

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certbot webroot way

sudo -e /etc/nginx/sites-available/default

server {
    ....
    location /.well-known/acme-challenge/ {
        root /path/to/www;
    }
 ...

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dovecot imap server sample

v2.4

config: config/mine.conf

ssl=no
# auth_allow_weak_schemes=yes
auth_allow_cleartext=yes
auth_mechanisms = plain login cram-md5

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check postgres access

SELECT pid, application_name, state, backend_start FROM pg_stat_activity WHERE pid <> pg_backend_pid();