mredar

Install self-signed cert in chromium on linux:
then you don't get complaints, will if it changes (MOTM attack?)

First, click on broken https in address bar & export certificate as a .der file
 
certutil -d sql:$HOME/.pki/nssdb -A -t "P,," -n <cert nickname> -i <cert file>

mredar

import datetime
import time

def pause_2b_nice(func):
    '''Pause the execution for however long func took to run.
    Useful for not overloading servers when downloading assets.
    '''
    def inner(*args, **kwargs):
        dt_start = dt_end = datetime.datetime.now()
        ret = func(*args, **kwargs)

mredar

For a provisioner to work, it must be installed on the local system. with ansible provisioner, need to ansible-playbook on local system

mredar

PID==$(docker inspect --format '{{.State.Pid}}' my_container_id)
nsenter --mount --uts --ipc --net --pid --target $PID

mredar

#! /bin/sh
### BEGIN INIT INFO
# Provides: portforwarding
# Required-Start: $network
# Required-Stop: $network
# Default-Start: 3 5
# Default-Stop: 0 1 2 6
# Description: Start port redirection
### END INIT INFO
 

mredar

HTML/CSS tricks
from: https://www.quora.com/Web-Development/What-are-the-most-interesting-HTML-JS-DOM-CSS-hacks-that-most-web-developers-dont-know-about

different node depth colors, for identifying layouts on page

* { background-color: rgba(255,0,0,.2); }
* * { background-color: rgba(0,255,0,.2); }
* * * { background-color: rgba(0,0,255,.2); }
* * * * { background-color: rgba(255,0,255,.2); }
* * * * * { background-color: rgba(0,255,255,.2); }

mredar

AWS Tips

EC2

To enable NAT function, you must DISABLE Source/Destination Check to let this happen.

Resize EBS volume

mredar

never use ec2 - exact_count paramter. This TERMINATED all the running instances except for exact_count number. This can have disatirous results, i hammered the whole cdlib dsc archivesspace server setup in AWs with this option. TODO: NEEDS to be noted in the options docs on this exact_count param.

use stete: present to create a new instance

not sure what state: running causes

always disable api termination
set to NOT DELETE on termination on ALL VOULUMES

TODO: REBUILD FROM SCRATCH: FRONT END WITH APACHE PROXY (due to nginx mangling of paths see: apache directive = <TODO: lookup>

mredar

http://www.docker.com/tryit/  - nice 10 min tutorial intro
https://registry.hub.docker.com/  - docker registry, a repo for docker images
http://serversforhackers.com/articles/2014/03/20/getting-started-with-docker/ - good post on starting with docker
http://www.centurylinklabs.com/what-is-docker-and-when-to-use-it/  - article on use cases for docker
http://blog.abhinav.ca/blog/2014/06/17/develop-a-nodejs-app-with-docker/ - interesting tutorial with a typical development workflow, nice how links working directory to container source dir so edits on host will show up in container

/var/lib/docker is where the data files for docker live on ubuntu

Use "Automated Build Repositories" or official images as a base for your own. You can pull the github repo for the automated build repos and build yourself. Can then modify the Dockerfile to suit your needs.

mredar

import smtpd
import asyncore

d=smtpd.DebuggingServer(('127.0.0.1', 25), None)

try:
    asyncore.loop()
except KeyboardInterrupt:
    pass