Archive
100% Stateless with JWT (JSON Web Token) by Hubert Sablonnière
In our modern REST architectures, the session cookies of old are getting stale and crusty. It’s time to unbox JSON Web Tokens : a new approach, simpler, 100% stateless and easily scalable.
No more server side session storage. No more session replication across the cluster. Best of all, navigating multiple layers of APIs with only a single connection is much easier.
In this talk, you will discover the inner workings of JWTs. You will see how to handle a client session properly between a browser and a server. We will explore other usages and wrap up with pros and cons.
Hubert Sablonnière
I’m a curious and passionnate Web developer. I’m specialized in HTML, CSS and JavaScript but I also use server side technologies like NodeJS, PHP, Java, Neo4j, Docker…With OpenDevise I help clients to move their trainings and conference talks to the next level.
My motivation : “To push the technology far enough to find new ways to improve user’s experiences.”
[DUK-7522]
The Fullstack Tutorial for GraphQL
The free and open-source tutorial to learn all around GraphQL to go from zero to production.
FOSS Software Alternative to Popular Proprietary Software
Multiple git user profiles
Problem:
How to have two git user profiles on one machine?
Solution:
From stackoverflow.
Global config ~/.gitconfig
[user]
name = John Doe
email = john@doe.tld[includeIf “gitdir:~/work/”]
path = ~/work/.gitconfig
Work specific config ~/work/.gitconfig
[user]
email = john.doe@company.tld
name = Nickname # If you do not want to use John Doe
Source:
https://stackoverflow.com/questions/4220416/can-i-specify-multiple-users-for-myself-in-gitconfig
Introduction to Digital Certificates.
This tutorial starts with a review of Symmetric and Asymmetric (PKI) Encryption. It discusses self signed certificates and how an SSL certificate is used in a Client-Server web communication session.
How to write secure code in Python
Since the beginning of the digital age, information has become one of the most valuable resources in the world. Personal information, bank data, logins and passwords – all of this, on one hand, makes life a lot easier in many aspects, and on the other, can be used by attackers to commit actions which will have negative consequences for the owner of this information.
Of course, in order to get hold of this information, you first need to find the vulnerabilities in the software that will allow you to steal important information by interfering with the correct execution of the program. In this article, we’ll look at vulnerabilities that the Python developer have to avoid when creating the software, and also give recommendations for writing secure code.
https://py.checkio.org/blog/how-to-write-secure-code-in-python/
Fantasy Name Generator
To generate some Klingon names instead of using John and Jane Doe.
http://www.fantasynamegenerators.com/star-trek-klingon-names.php
docker: Error response from daemon…
Problem:
I was getting this error.
docker: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused “exec: \”telnet\”: executable file not found in $PATH”: unknown.
$ docker run --name greeter -d --expose 5000 alpine /bin/sh -c "echo Welcome stranger | nc -lp 5000" 51b6a0b73dc1cbc9b39757dff20ada1f5638c1ec781625d9e2fc6c9cced01639
$ docker exec greeter ifconfig
eth0 Link encap:Ethernet HWaddr 02:42:AC:11:00:02
inet addr:172.17.0.2 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:758 (758.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
$ docker run alpine telnet 172.17.0.2 5000 docker: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "exec: \"telnet\": executable file not found in $PATH": unknown. ERRO[0000] error waiting for container: context canceled
$ docker run -it alpine /bin/sh / # telnet 172.17.0.2 5000 /bin/sh: telnet: not found
Solution:
This error means that whatever I am trying to run does not exist. So my options are to install telnet in the container or use a different command like `nc`.
port forwarding
Problem:
You want to access a site with a particular IP. Eg google maps only allows a set of IPs to access. So running code from a vagrant box then accessing from the host is not so straight forward.
Solution:
Went with using ssh
$ ssh -nNT -L 3000:localhost:3000 vagrant@127.0.0.1 -p 2222
So on the host I can access a service running on a vagrant box (192.168.33.10:3000) via localhost:3000
complete:13: command not found: compdef
Problem:
You get this error `complete:13: command not found: compdef` for a customised zsh profile. I am trying to add kubectl completion for zsh.
Solution:
Install the zsh packages below, Save and exit.
$ autoload -Uz compinstall && compinstall
Source:
https://unix.stackexchange.com/questions/339954/zsh-command-not-found-compinstall-compinit-compdef
pseudo-scripter 