Raindrop Tag Cloud

Launch Schedule – Spaceflight Now
https://spaceflightnow.com/launch-schedule/
Information is Beautiful
https://informationisbeautiful.net/
Movie Rankings
https://movies-ranking-rho.vercel.app/top?limit=100
The Missing Semester of Your CS Education
https://missing.csail.mit.edu/
Development Environment and Tools
https://missing.csail.mit.edu/2026/development-environment/
V
https://teams.microsoft.com/v2/
TopNotch for macOS
https://topnotch.app/
macOS Hardening: a new series
https://bytearchitect.io/macos-security/macOS-Hardening-a-new-series/#defence-in-depth---the-philosophy
vSphere - DCTW11MTO01 - Summary
https://dcpvcsa01.discovery.holdings.co.za/ui/app/vm;nav=h/urn:vmomi:VirtualMachine:vm-6057675:f94196aa-d341-4ca7-95e3-ac06ba56ab6f/summary?navigator=tree
When using Caddy for a reverse proxy, what should I use for basic security?
https://www.reddit.com/r/selfhosted/s/OtPOdTypxU
Caddy
https://www.authelia.com/integration/proxies/caddy/
Howto Save Mikrotik/Cisco Logs to Remote SYSLOG Server
https://aacable.wordpress.com/2011/11/29/howto-save-mikrotik-logs-to-remote-syslog-server/
Beyondthebasicstuffwithpython
https://ia800604.us.archive.org/3/items/ebooks_202307/beyondthebasicstuffwithpython.pdf
Django Ninja
https://django-ninja.dev/
Computers Are Bad
https://computer.rip/
Customize Nano Text Editor | Rayhan Aziz Chowdhury Shafi
https://shafi.ddns.net/blog/customize-nano-text-editor
tinyapps.org / blog
https://tinyapps.org/blog/
The Quantum Cat | Alastair Williams | Substack
https://www.thequantumcat.space/
Macs – The Eclectic Light Company
https://eclecticlight.co/category/macs/
Customize your home page — Wagtail Documentation 7.2.1 documentation
https://docs.wagtail.org/en/stable/tutorial/customize_homepage.html
Setting up a Django development environment - Learn web development | MDN
https://developer.mozilla.org/en-US/docs/Learn_web_development/Extensions/Server-side/Django/development_environment
Django Tutorial Part 11: Deploying Django to production - Learn web development | MDN
https://developer.mozilla.org/en-US/docs/Learn_web_development/Extensions/Server-side/Django/Deployment
The Concise TypeScript Book
https://gibbok.github.io/typescript-book/book/the-concise-typescript-book/
Toy browser
https://taonexus.com/publicfiles/jan2026/171toy-browser.py.txt
The idiomatic ZFS on Linux quickstart cheat-sheet
https://neosmart.net/blog/zfs-on-linux-quickstart-cheat-sheet/
Cameras and Lenses – Bartosz Ciechanowski
https://ciechanow.ski/cameras-and-lenses/
The CyberSec Guru | Your Digital Sensei
https://thecybersecguru.com/
Let's make a Teeny Tiny compiler, part 1
https://austinhenley.com/blog/teenytinycompiler1.html
Patterns.dev
https://www.patterns.dev/
Construction Physics | Brian Potter | Substack
https://www.construction-physics.com/
Alice GG • Playing with open source LLMs
https://alicegg.tech//2025/07/29/open-source-llm.html
The Narrow Road to the Deep North review – immensely powerful TV
https://www.theguardian.com/tv-and-radio/2025/jul/20/the-narrow-road-to-the-deep-north-review-immensely-powerful-tv
Download resource
https://www.paloaltonetworks.com/apps/pan/public/downloadResource?pagePath=/content/pan/en_US/resources/guides/gcp-architecture-guide
Summer sizzlers! It’s the 20 hottest TV shows of the season
https://www.theguardian.com/tv-and-radio/2025/jun/27/summer-sizzlers-its-the-20-hottest-tv-shows-of-the-season
Citrix Workspace
https://citrixapps.discovery.co.za/Citrix/Xendesktop7Web/
Stirling PDF
https://stirlingpdf.io/?lang=en_GB
Mozilla - Devil Incarnate
https://digdeeper.club/articles/mozilla.xhtml
The Engineering Design Revolution - A History of CAD
https://www.shapr3d.com/blog/history-of-cad
Mission Control — SomaFM Player
https://somafm.com/player24/station/missioncontrol
tv.apple.com
https://tv.apple.com/us/show/wanted-the-escape-of-carlos-ghosn/umc.cmc.34nvp6vc5in9logmjc7hezp52
Power Chat – Geordin Hill-Lewis on leadership, global tensions & Cape Town’s future
https://www.dailymaverick.co.za/article/2025-02-13-power-chat-geordin-hill-lewis-on-leadership-global-tensions-cape-towns-future/?dm_source=dm_block_list&dm_medium=card_link&dm_campaign=main
Haterade | Liz Cook | Substack
https://haterade.substack.com/
Throwback Thursday: How to cook a lamb chop without wasting beer
https://www.dailymaverick.co.za/article/2025-02-06-throwback-thursday-how-to-cook-a-lamb-chop-without-wasting-beer/?dm_source=dm_block_grid&dm_medium=card_link&dm_campaign=main
‘Paradise’ Premiere Draws 7 Million Views Globally in First Week Across Hulu, Disney+ (EXCLUSIVE)
https://variety.com/2025/tv/news/paradise-ratings-viewership-hulu-disney-plus-1236297732/
Lekker Brekker Monday: Bangers on toast
https://www.dailymaverick.co.za/article/2025-02-03-lekker-brekker-monday-bangers-on-toast/?dm_source=dm_block_grid&dm_medium=card_link&dm_campaign=main
Recipe Risotto - Econo Foods
https://econofoods.co.za/recipe-risotto/
Recipe Pork Chops - Econo Foods
https://econofoods.co.za/recipe-pork-chops/
Recipe Mushroom Pork Chops - Econo Foods
https://econofoods.co.za/recipe-mushroom-pork-chops/
Recipe Meaty Bones Soup - Econo Foods
https://econofoods.co.za/recipe-meaty-bones-soup/
Recipe Calamari Dip - Econo Foods
https://econofoods.co.za/recipe-calamari-dip/
Recipe Hake Pot - Econo Foods
https://econofoods.co.za/recipe-hake-pot/
Recipe Cajun Hake - Econo Foods
https://econofoods.co.za/recipe-cajun-hake/
Recipe Chicken Stew - Econo Foods
https://econofoods.co.za/recipe-chicken-stew/
Recipe Mussel Pot - Econo Foods
https://econofoods.co.za/recipe-mussel-pot/
Online Meetings
https://na.org.za/na-online-meetings/
Creating C4 and UML Diagrams Using PlantUML with VSCode Extension
https://medium.com/@robertdennyson/creating-c4-and-uml-diagrams-using-plantuml-with-vscode-extension-90032a21ec43
SAML: A technical primer — SSOReady Docs
https://ssoready.com/docs/saml/saml-technical-primer
10.4. Using GRUB to Set Up the Boot Process
https://www.linuxfromscratch.org/~xry111/lfs/view/arm64/chapter10/grub.html
Progress during large file copy (Copy-Item & Write-Progress?)
https://stackoverflow.com/questions/2434133/progress-during-large-file-copy-copy-item-write-progress
Rapid Prototyping with Django, htmx, and Tailwind CSS
https://testdriven.io/blog/django-htmx-tailwind/
Django + HTMX tutorial
https://harabat.github.io/django-htmx/
Modern JavaScript for Django Developers
https://www.saaspegasus.com/guides/modern-javascript-for-django-developers/
The Art of Unix Programming
http://www.catb.org/esr/writings/taoup/html/
How To Create RAID Arrays with mdadm on Ubuntu 22.04
https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu-22-04
Lite MD Python Designer - LabDeck
https://labdeck.com/python/
PyQt5 tutorial - Python GUI programming examples
https://likegeeks.com/pyqt5-tutorial/
PAGE
https://sourceforge.net/projects/page/
tkdesigner
https://pypi.org/project/tkdesigner/
FreePascal and JSON
https://medium.com/@marcusfernstrm/freepascal-and-json-337c04cad489
The Feynman Lectures on Physics Vol. I Ch. 22: Algebra
https://www.feynmanlectures.caltech.edu/I_22.html
Creating diagrams - GitHub Docs
https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-diagrams
Flowchart Fun
https://flowchart.fun/
Building awesome diagrams with D2
https://victorbjorklund.com/build-diagrams-as-code-with-d2-d2lang
I have come to bury the BIOS, not to open it: The need for holistic systems - OSFC
https://osfc.io/2022/talks/i-have-come-to-bury-the-bios-not-to-open-it-the-need-for-holistic-systems/
Linux Performance
https://www.brendangregg.com/linuxperf.html
Home
https://dn42.eu/Home
The Containers & Group Containers Folder on Mac [Explained]
https://iboysoft.com/wiki/mac-containers-folder.html
The Interface of Kai Krause's Software @mprove
https://mprove.de/script/99/kai/
Introduction to data: 1 - Language of data
https://openintro.shinyapps.io/ims-01-data-01#section-types-of-variables
Chapter 2 Study design | Introduction to Modern Statistics (1st Ed)
https://openintro-ims.netlify.app/data-design
Introduction to Modern Statistics | Hacker News
https://news.ycombinator.com/item?id=37854846
What is SABSA Enterprise Security Architecture and why should you care ? | by Mario Platt | Medium
https://medium.com/@marioplatt/what-is-sabsa-enterprise-security-architecture-and-why-should-you-care-a649418b2742
How to Create an SSH Honeypot to Catch Hackers in Your Linux Server - Make Tech Easier
https://www.maketecheasier.com/create-ssh-honeypot-linux-server
Deploy Nagios as a Docker Container - kifarunix.com
https://kifarunix.com/deploy-nagios-as-a-docker-container
2 Ways to add users to sudoers group in Debian 11 - Linux Shout
https://linux.how2shout.com/2-ways-to-add-users-to-sudoers-group-in-debian-11
How to Setup a Raspberry Pi Wireless Access Point - Howchoo
https://howchoo.com/pi/setup-a-raspberry-pi-wireless-access-point
markusmcnugen/qbittorrentvpn - Docker Image | Docker Hub
https://hub.docker.com/r/markusmcnugen/qbittorrentvpn
Routing Docker Host And Container Traffic Through WireGuard | LinuxServer.io
https://www.linuxserver.io/blog/routing-docker-host-and-container-traffic-through-wireguard
How To Set Up WireGuard on Debian 11 | DigitalOcean
https://www.digitalocean.com/community/tutorials/how-to-set-up-wireguard-on-debian-11
Complete Wireguard Setup in 20 min - Better Linux VPN Server | SHB
https://www.smarthomebeginner.com/linux-wireguard-vpn-server-setup
Linux | UTM Documentation
https://docs.getutm.app/guest-support/linux#ubuntu-debian-apt-based
Download
https://cyberduck.io/download
Create a WireGuard VPN in 10 minutes with Docker
https://jakew.me/wireguard-docker
(3) Multi-thread rsync : sysadmin
https://www.reddit.com/r/sysadmin/comments/pb7lar/multithread_rsync
Ubuntu Manpage: rsync - a fast, versatile, remote (and local) file-copying tool
https://manpages.ubuntu.com/manpages/impish/man1/rsync.1.html
Quickstart — Glances 3.4.0.3 documentation
https://glances.readthedocs.io/en/latest/quickstart.html
How To Create RAID Arrays with mdadm on Debian 9 | DigitalOcean
https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-debian-9
5 Tips To Speed Up Linux Software Raid Rebuilding And Re-syncing - nixCraft
https://www.cyberciti.biz/tips/linux-raid-increase-resync-rebuild-speed.html
Replacing a failing RAID 6 drive with mdadm | Enable Sysadmin
https://www.redhat.com/sysadmin/raid-drive-mdadm
A guide to mdadm - Linux Raid Wiki
https://raid.wiki.kernel.org/index.php/A_guide_to_mdadm#Follow_or_Monitor
SFTP
https://rclone.org/sftp
bash - Speed up rsync with Simultaneous/Concurrent File Transfers? - Stack Overflow
https://stackoverflow.com/questions/24058544/speed-up-rsync-with-simultaneous-concurrent-file-transfers
GitHub - jbd/msrsync: Multi-stream rsync wrapper
https://github.com/jbd/msrsync
linux commands for measuring disk activity
https://www.networkworld.com/article/3330497/linux-commands-for-measuring-disk-activity.html
Install Proxmox VE on Debian 11 Bullseye - Proxmox VE
https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_11_Bullseye
Making secure remote backups with Rsync - Linux.com
https://www.linux.com/news/making-secure-remote-backups-rsync
minikube start | minikube
https://minikube.sigs.k8s.io/docs/start
What’s cooking today: Beef shin on the bone
https://www.dailymaverick.co.za/article/2023-02-22-whats-cooking-today-beef-shin-on-the-bone
Install and Setup ZFS on Debian 11
https://linuxhint.com/install-zfs-debian#a1
ZFS - Create Disk Pools | Programster's Blog
https://blog.programster.org/zfs-create-disk-pools
Python Dictionary Comprehension Tutorial (with 39 Examples)
https://www.dataquest.io/blog/python-dictionary-comprehension-tutorial
URLs Lead The Way · Matt Layman
https://www.mattlayman.com/understand-django/urls-lead-way
Handling File Uploads with Django
https://stackabuse.com/handling-file-uploads-with-django
Store Data With Models · Matt Layman
https://www.mattlayman.com/understand-django/store-data-with-models
[no title]
https://code.joejag.com/2020/a-month-with-powershell.html
websharper-cookbook-tutorial/cookbook-chapter-01.md at master · AlexPeret/websharper-cookbook-tutorial
https://github.com/AlexPeret/websharper-cookbook-tutorial/blob/master/articles/cookbook-chapter-01.md
Teach Yourself Computer Science
https://teachyourselfcs.com/#programming
python - Update list of records and fields into django model with bulk_update - Stack Overflow
https://stackoverflow.com/questions/56329144/update-list-of-records-and-fields-into-django-model-with-bulk-update
When Management Isn’t for You: How to Advance in Your Career as an IC
https://www.platohq.com/resources/when-management-isnt-for-you-how-to-advance-in-your-career-as-an-ic-1490593444
python - How to overcome "datetime.datetime not JSON serializable"? - Stack Overflow
https://stackoverflow.com/questions/11875770/how-to-overcome-datetime-datetime-not-json-serializable
linux - sudo: docker-compose: command not found - Stack Overflow
https://stackoverflow.com/questions/38775954/sudo-docker-compose-command-not-found
Add Your Account as a Sudoer on Mac | zwbetz
https://zwbetz.com/add-your-account-as-a-sudoer-on-mac
Bash Shell: Take Control of PS1, PS2, PS3, PS4 and PROMPT_COMMAND
https://www.thegeekstuff.com/2008/09/bash-shell-take-control-of-ps1-ps2-ps3-ps4-and-prompt_command
Working with SharePoint sites in Microsoft Graph - Microsoft Graph v1.0 | Microsoft Learn
https://learn.microsoft.com/en-us/graph/api/resources/sharepoint?view=graph-rest-1.0
Leo Robinovitch @ The Leo Zone
https://theleo.zone/posts/linux-upskill
Logs Told Us It Was DNS, It Looked like DNS, It Had to Be DNS, It Wasn't DNS
https://www.usenix.org/conference/srecon23americas/presentation/bernaille
Story Structure 101: Super Basic Shit
https://channel101.fandom.com/wiki/Story_Structure_101:_Super_Basic_Shit
The Untold Story of SQLite
https://corecursive.com/066-sqlite-with-richard-hipp
Rancher Desktop
https://rancherdesktop.io
9 Must-Read Books for Software Engineers in 2023
https://grantisom.com/2023/01/02/mustread-books-for.html
Inside the 8086 processor's instruction prefetch circuitry
http://www.righto.com/2023/01/inside-8086-processors-instruction.html?m=1
3 Bedroom Townhouse to rent in Durban North - Durban North
https://www.property24.com/to-rent/durban-north/durban-north/kwazulu-natal/6077/111734505
How to setup Raspberry Pi Lighttpd - Pi My Life Up
https://pimylifeup.com/raspberry-pi-lighttpd
Self Host Bitwarden on a Raspberry Pi in 2022 | WunderTech
https://www.wundertech.net/how-to-self-host-bitwarden-on-a-raspberry-pi
GNU nano is my editor of choice
https://ariadne.space/2021/08/13/gnu-nano-is-my-editor-of-choice
3 Bedroom Simplex To Let in Sunningdale | Wakefields Estate Agents
https://www.wakefields.co.za/results/residential/to-let/umhlanga/sunningdale/simplex/74253
python 3.x - awscli fails to work: No module named 'awscli' - Stack Overflow
https://stackoverflow.com/questions/43873663/awscli-fails-to-work-no-module-named-awscli
Install and Deploy - Linux | Bitwarden Help Center
https://bitwarden.com/help/install-on-premise-linux#create-bitwarden-local-user--directory
How can I make git show a list of the files that are being tracked? - Stack Overflow
https://stackoverflow.com/questions/15606955/how-can-i-make-git-show-a-list-of-the-files-that-are-being-tracked
How do I make Git forget about a file that was tracked, but is now in .gitignore? - Stack Overflow
https://stackoverflow.com/questions/1274057/how-do-i-make-git-forget-about-a-file-that-was-tracked-but-is-now-in-gitignore
python - PyCharm doesn’t see files in project - Stack Overflow
https://stackoverflow.com/questions/67402144/pycharm-doesn-t-see-files-in-project
Norwegian Cruise Line - South Africa – Port Elizabeth, Durban, and Lüderitz (13 days) | Virtuoso
https://www.virtuoso.com/travel/luxury-cruises/sailings/16479145/south-africa-port-elizabeth-durban-and-luderitz-01feb2024-13feb2024
Configure an interpreter using Docker Compose | PyCharm Documentation
https://www.jetbrains.com/help/pycharm/using-docker-compose-as-a-remote-interpreter.html#run
Kartoza - Using a Docker Compose-Based Python Interpreter in PyCharm
https://kartoza.com/blog/docker/using-a-docker-compose-based-python-interpreter-in-pycharm
Monitoring MikroTik SNMP v3 with Zabbix » MHELP.PRO
https://mhelp.pro/monitoring-mikrotik-snmp-v3-with-zabbix
Authenticate with GitHub using a token - Stack Overflow
https://stackoverflow.com/questions/18935539/authenticate-with-github-using-a-token
Zabbix Docker Installation | Mike Polinowski
https://mpolinowski.github.io/docs/DevOps/Zabbix/2020-07-15--zabbix-docker-installation/2020-07-15
Zabbix: monitoring your infrastructure - installation and configuration with Docker - RDR-IT
https://rdr-it.com/en/zabbix-monitoring-your-infrastructure-installation-and-configuration-with-docker
Monitor Mikrotik Router With Nagios Via SNMP. – www.deanwilding.co.uk
https://deanwilding.co.uk/2019/12/16/monitor-mikrotik-router-with-nagios-via-snmp
Boring Python: code quality
https://www.b-list.org/weblog/2022/dec/19/boring-python-code-quality
Django Docker Deployment with HTTPS using Letsencrypt – London App Developer
https://londonappdeveloper.com/django-docker-deployment-with-https-using-letsencrypt
Setting up a Django development environment - Learn web development | MDN
https://developer.mozilla.org/en-US/docs/Learn/Server-side/Django/development_environment
ShareForce
https://www.shareforce.net/app/portal/v2/home
Dockerizing Django with Postgres, Gunicorn, and Nginx | TestDriven.io
https://testdriven.io/blog/dockerizing-django-with-postgres-gunicorn-and-nginx
cloudentity/oauth2c: User-friendly CLI for OAuth2
https://github.com/cloudentity/oauth2c
Using the Postgres bytea Type with Django
https://www.crunchydata.com/blog/using-postgresqls-bytea-type-with-django
ANTHONY CLARK: Don’t go light on helium
https://www.businesslive.co.za/fm/special-reports/2022-11-24-anthony-clark-dont-go-light-on-helium
Designing Windows 95’s User Interface
https://socket3.wordpress.com/2018/02/03/designing-windows-95s-user-interface
: Bam Bam Aurora Donna : Pretoria : Erasmuskloof
https://www.esa.co.za/escorts/viewEscort.php?city=Pretoria&name=Bam+Bam+%40+Aurora+Donna&uid=27454
GitHub: invalid username or password - Stack Overflow
https://stackoverflow.com/questions/29297154/github-invalid-username-or-password
Enigma
https://www.rottentomatoes.com/m/1113649-enigma
Pagination for large result sets | Microsoft Learn
https://learn.microsoft.com/en-us/sharepoint/dev/general-development/pagination-for-large-result-sets
Solving common problems with Kubernetes
https://blog.adamchalmers.com/kubernetes-problems
List sites - Microsoft Graph v1.0 | Microsoft Learn
https://learn.microsoft.com/en-us/graph/api/site-list?view=graph-rest-1.0
Source & Binary / An AWS account just for getting into other AWS accounts
https://src-bin.com/an-aws-account-just-for-getting-into-other-aws-accounts
All Quiet on the Western Front: Netflix’s epic war film is brutal and brilliant
https://www.timeout.com/movies/all-quiet-on-the-western-front-2022
The Mainframe In Your Pocket - by Babbage - The Chip Letter
https://thechipletter.substack.com/p/the-mainframe-in-your-pocket
You Suck at Excel with Joel Spolsky
https://www.youtube.com/watch?v=0nbkaYsR94c
Pi-hole - raspberrypi
http://rpi-home-1.rantingdemon.net:2000/admin/index.php
python - PyCharm with Pyenv - Stack Overflow
https://stackoverflow.com/questions/41129504/pycharm-with-pyenv
python - django admin: save image like base64 - Stack Overflow
https://stackoverflow.com/questions/66846390/django-admin-save-image-like-base64
users - bash: adduser: command not found [Debian Buster] - Unix & Linux Stack Exchange
https://unix.stackexchange.com/questions/565665/bash-adduser-command-not-found-debian-buster
How to Deploy a Caddy Web Server With Docker
https://www.howtogeek.com/devops/how-to-deploy-a-caddy-web-server-with-docker
Install Docker Engine on Debian | Docker Documentation
https://docs.docker.com/engine/install/debian
How To Connect a USB Flash Drive to Raspberry Pi? | PiFormulae
https://seamusdemora.github.io/PiFormulae/ExternalDrives.html
Raspberry Pi Mount a USB Drive Tutorial - Pi My Life Up
https://pimylifeup.com/raspberry-pi-mount-usb-drive
raspbian stretch - Access point as WiFi router/repeater with additional WiFi-dongle - Raspberry Pi Stack Exchange
https://raspberrypi.stackexchange.com/questions/95072/access-point-as-wifi-router-repeater-with-additional-wifi-dongle/95073#95073
systemd - Automatically use usb_modeswitch for Wifi USB - Ask Ubuntu
https://askubuntu.com/questions/1080944/automatically-use-usb-modeswitch-for-wifi-usb
How to install kernel-headers - Raspberry Pi Forums
https://forums.raspberrypi.com/viewtopic.php?t=154749
drivers - Wireless USB Adapter 0bda:c811 Realtek Semiconductor Corp - Ask Ubuntu
https://askubuntu.com/questions/1162974/wireless-usb-adapter-0bdac811-realtek-semiconductor-corp
Overclocking the Raspberry Pi 4 - Q-engineering
https://qengineering.eu/overclocking-the-raspberry-pi-4.html
Sailpoint Overview | Splunk 8.2.5
https://dcpsplunk.discsrv.co.za:8000/en-US/app/discovery_sailpoint/sailpoint_overview?form.category=*&form.field3.earliest=-24h%40h&form.field3.latest=now&form.source=*&form.user=
Planon ProCenter : Discovery
https://discovery-prod.planoncloud.com/home/BP/WebClient?2=
How to Convert Azure B2B Guest Users to Members While Maintaining User Collaboration
https://practical365.com/how-to-convert-azure-b2b-guest-users-to-members-while-maintaining-user-collaboration
[Tutorial] FastAPI with SQLAlchemy, PostgreSQL and Alembic and of course Docker [Part-1] | Medium
https://ahmed-nafies.medium.com/fastapi-with-sqlalchemy-postgresql-and-alembic-and-of-course-docker-f2b7411ee396
python - certificate verify failed: unable to get local issuer certificate - Stack Overflow
https://stackoverflow.com/questions/52805115/certificate-verify-failed-unable-to-get-local-issuer-certificate