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Alert Linux when Boot & Shutdown

Environment

• BOT Telegram
• Linux

Make Telegram Service

You can follow this Step

Start Alert on Boot

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Auto Start Instance when Openstack Cluster Reboot

Execution

Add some configuration on nova.conf

sudo nano /etc/kolla/nova-compute/nova.conf

[DEFAULT]
resume_guests_state_on_host_boot = True

gilangvperdana

Auto Restart Linux Systemd Service

If you have an important service, than you not want to monitor & operate those service 24/7 you can guard against catastrophic crashes by doing auto-restart.

Execution

nano /lib/systemd/system/nginx.service

[Service]

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Linux Files Immutable?

Ever feel 'operattion not-permitted' on linux, please do this to revert or even if you want to protect a file to be safe.

Execution

cat ~/.ssh/id_rsa.pub > authorized_keys
chattr +i authorized_keys 
rm authorized_keys

rm: remove write-protected regular file `file1'? y

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Disable Defectdojo CSRF Login

nano settings.dist.py

# Django settings for DefectDojo
import os
from datetime import timedelta
from celery.schedules import crontab

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Reverse Django Apps with CSRF Enabled and Different Domain

If you want to redirect your Django apps running on local domain (https://public.public.id) will be client access on (https://public.public.domain.id) you can use these technique :

Nginx conf on your first HOP

server {
    listen 80;
    listen 443 ssl http2;
    listen [::]:443 ssl http2;

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Monitor Certificate with Nodecert Exporter

Install Node Cert Exporter

wget https://github.com/amimof/node-cert-exporter/releases/download/v1.1.2/node-cert-exporter-linux-amd64
cp node-cert-exporter-linux-amd64 /usr/local/bin/node-cert-exporter
chmod a+x /usr/local/bin/node-cert-exporter

Create systemd Node Cert Exporter

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Change Logo on Horizon Kolla-Ansible

# Backup Default logo
docker exec horizon cp /var/lib/kolla/venv/lib/python3.8/site-packages/static/dashboard/img/logo-splash.svg /var/lib/kolla/venv/lib/python3.8/site-packages/static/dashboard/img/logo-splash.svg.org
docker exec horizon cp /var/lib/kolla/venv/lib/python3.8/site-packages/static/dashboard/img/logo.svg /var/lib/kolla/venv/lib/python3.8/site-packages/static/dashboard/img/logo.svg.org
docker exec horizon cp /var/lib/kolla/venv/lib/python3.8/site-packages/static/dashboard/img/favicon.ico /var/lib/kolla/venv/lib/python3.8/site-packages/static/dashboard/img/favicon.ico.org

# Copy New logo in container
docker cp logo-splash.svg horizon:/var/lib/kolla/venv/lib/python3.8/site-packages/static/dashboard/img

gilangvperdana

Install Cubic

sudo apt-add-repository ppa:cubic-wizard/release
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6494C6D6997C215E
sudo apt update
sudo apt install cubic

Test ISO Operational

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Auto Prune Unused Image Kubernetes with Docker Runtime

This is some general bash for daily prune unused images on Kubernetes

Execution

Make cron

cd /etc/cron.daily
sudo nano docker-prune