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張 旭

MonolithFirst - 0 views

martinfowler.com/...MonolithFirst.html

system architecture deploy

shared by 張 旭 on 05 Jun 15 - No Cached
  • Microservices are a useful architecture, but even their advocates say that using them incurs a significant MicroservicePremium, which means they are only useful with more complex systems.
  • you should build a new application as a monolith initially, even if you think it's likely that it will benefit from a microservices architecture later on.
  • Any refactoring of functionality between services is much harder than it is in a monolith.
  • ...4 more annotations...
  • By building a monolith first, you can figure out what the right boundaries are, before a microservices design brushes a layer of treacle over them.
  • The logical way is to design a monolith carefully, paying attention to modularity within the software, both at the API boundaries and how the data is stored.
  • start with a monolith and gradually peel off microservices at the edges
  • Don't be afraid of building a monolith that you will discard, particularly if a monolith can get you to market quickly
張 旭

The Rubyist's Guide to Environment Variables - Honeybadger.io Blog - 0 views

blog.honeybadger.io/by-guide-environment-variables

ruby environment development shell

shared by 張 旭 on 12 Jun 15 - No Cached
  • If you want to be able to effectively manage web apps in development and in production, you have to understand environment variables.
  • Every program you run on your server has at least one process. That process gets its own set of environment variables.
  • Once it has them, nothing outside of that process can change them.
  • ...9 more annotations...
  • Every program you run on your server gets its own set of environment variables at the moment you launch it.
  • Environment variables die with their process
  • Every process has a parent. That’s because every program has to be started by some other program.
  • Child processes inherit env vars from their parent
  • By default a child will get copies of every environment variable that its parent has. But the parent has control over this.
  • Changes to the environment don’t sync between running processes
  • shells do provide their own “local” shell variable systems
  • Environment variables are NOT the same as shell variables
  • use the export command to convert the local variable into an environment variable.
張 旭

phusion/baseimage-docker - 1 views

github.com/...baseimage-docker

docker ubuntu base system

shared by 張 旭 on 24 Jun 15 - No Cached
    • 張 旭
      張 旭 on 24 Jun 15
       
      原始的 docker 在執行命令時，預設就是將傳入的 COMMAND 當成 PID 1 的程序，執行完畢就結束這個  docker，其他的 daemons 並不會執行，而 baseimage 解決了這個問題。
    • crazylion lee
      crazylion lee on 17 Dec 15
       
      好棒棒
  • docker exec
  • Through SSH
  • ...57 more annotations...
  • docker exec -t -i YOUR-CONTAINER-ID bash -l
  • Login to the container
  • Baseimage-docker only advocates running multiple OS processes inside a single container.
  • Password and challenge-response authentication are disabled by default. Only key authentication is allowed.
  • A tool for running a command as another user
  • The Docker developers advocate the philosophy of running a single logical service per container. A logical service can consist of multiple OS processes.
  • All syslog messages are forwarded to "docker logs".
  • Splitting your logical service into multiple OS processes also makes sense from a security standpoint.
  • Baseimage-docker provides tools to encourage running processes as different users
  • sometimes it makes sense to run multiple services in a single container, and sometimes it doesn't.
  • Baseimage-docker advocates running multiple OS processes inside a single container, and a single logical service can consist of multiple OS processes.
  • using environment variables to pass parameters to containers is very much the "Docker way"
  • add additional daemons (e.g. your own app) to the image by creating runit entries.
  • the shell script must run the daemon without letting it daemonize/fork it.
  • All executable scripts in /etc/my_init.d, if this directory exists. The scripts are run in lexicographic order.
  • variables will also be passed to all child processes
  • Environment variables on Unix are inherited on a per-process basis
  • there is no good central place for defining environment variables for all applications and services
  • centrally defining environment variables
  • One of the ideas behind Docker is that containers should be stateless, easily restartable, and behave like a black box.
  • a one-shot command in a new container
  • immediately exit after the command exits,
  • However the downside of this approach is that the init system is not started. That is, while invoking COMMAND, important daemons such as cron and syslog are not running. Also, orphaned child processes are not properly reaped, because COMMAND is PID 1.
  • Baseimage-docker provides a facility to run a single one-shot command, while solving all of the aforementioned problems
  • Nginx is one such example: it removes all environment variables unless you explicitly instruct it to retain them through the env configuration option.
  • Mechanisms for easily running multiple processes, without violating the Docker philosophy
  • Ubuntu is not designed to be run inside Docker
  • According to the Unix process model, the init process -- PID 1 -- inherits all orphaned child processes and must reap them
  • Syslog-ng seems to be much more stable
  • cron daemon
  • Rotates and compresses logs
  • /sbin/setuser
  • A tool for installing apt packages that automatically cleans up after itself.
  • a single logical service inside a single container
  • A daemon is a program which runs in the background of its system, such as a web server.
  • The shell script must be called run, must be executable, and is to be placed in the directory /etc/service/<NAME>. runsv will switch to the directory and invoke ./run after your container starts.
  • If any script exits with a non-zero exit code, the booting will fail.
  • If your process is started with a shell script, make sure you exec the actual process, otherwise the shell will receive the signal and not your process.
  • any environment variables set with docker run --env or with the ENV command in the Dockerfile, will be picked up by my_init
  • not possible for a child process to change the environment variables of other processes
  • they will not see the environment variables that were originally passed by Docker.
  • We ignore HOME, SHELL, USER and a bunch of other environment variables on purpose, because not ignoring them will break multi-user containers.
  • my_init imports environment variables from the directory /etc/container_environment
  • /etc/container_environment.sh - a dump of the environment variables in Bash format.
  • modify the environment variables in my_init (and therefore the environment variables in all child processes that are spawned after that point in time), by altering the files in /etc/container_environment
  • my_init only activates changes in /etc/container_environment when running startup scripts
  • environment variables don't contain sensitive data, then you can also relax the permissions
  • Syslog messages are forwarded to the console
  • syslog-ng is started separately before the runit supervisor process, and shutdown after runit exits.
  • RUN apt-get update && apt-get upgrade -y -o Dpkg::Options::="--force-confold"
  • /sbin/my_init --skip-startup-files --quiet --
  • By default, no keys are installed, so nobody can login
  • provide a pregenerated, insecure key (PuTTY format)
  • RUN /usr/sbin/enable_insecure_key
  • docker run YOUR_IMAGE /sbin/my_init --enable-insecure-key
  • RUN cat /tmp/your_key.pub >> /root/.ssh/authorized_keys && rm -f /tmp/your_key.pub
  • The default baseimage-docker installs syslog-ng, cron and sshd services during the build process
crazylion lee

BFH ImagePlay - Rapid Prototyping for Image Processing - 0 views

imageplay.io

processing image

shared by crazylion lee on 06 Aug 15 - No Cached
  • crazylion lee on 06 Aug 15
     
    "ImagePlay is a rapid prototyping tool for building and testing image processing algorithms. It comes with a variety of over 70 individual image processors which can be combined into complex process chains. ImagePlay is completely open source and can be built for Windows, Mac and Linux."
crazylion lee

jkbrzt/httpie - 0 views

github.com/httpie

curl

shared by crazylion lee on 08 Aug 15 - No Cached
  • crazylion lee on 08 Aug 15
     
    "CLI HTTP client; user-friendly cURL replacement featuring intuitive UI, JSON support, syntax highlighting, wget-like downloads, extensions, etc. http://httpie.org"
crazylion lee

Grafana - Graphite and InfluxDB Dashboard and graph composer - 0 views

grafana.org

graph graphite

shared by crazylion lee on 28 Aug 15 - No Cached
  • crazylion lee on 28 Aug 15
     
    "An open source, feature rich metrics dashboard and graph editor for Graphite, InfluxDB & OpenTSDB."
crazylion lee

Babel · The compiler for writing next generation JavaScript - 0 views

babeljs.io

HTML5 javascript es6

shared by crazylion lee on 28 Aug 15 - No Cached
  • crazylion lee on 28 Aug 15
     
    "Babel is a JavaScript compiler. Use next generation JavaScript, today."
crazylion lee

Roda: Routing Tree Web Framework Toolkit - Why - 0 views

roda.jeremyevans.net/why.html

web framework ruby rack Sinatra

shared by crazylion lee on 31 Aug 15 - No Cached
  • crazylion lee on 31 Aug 15
     
    "There are already plenty of Ruby web frameworks. Why another one? Well, Roda has a very useful combination of features that make web development easy. It's designed to be fast, DRY, and correct. "
crazylion lee

zoofIO/flexx - 0 views

github.com/flexx

gui ui python

shared by crazylion lee on 08 Sep 15 - No Cached
  • crazylion lee on 08 Sep 15
     
    "Python UI tookit based on web technology http://flexx.readthedocs.org"
crazylion lee

Vega - 0 views

vega.github.io

visualization canvas svg

shared by crazylion lee on 10 Sep 15 - No Cached
  • crazylion lee on 10 Sep 15
     
    "Vega is a declarative format for creating, saving, and sharing visualization designs. With Vega, visualizations are described in JSON, and generate interactive views using either HTML5 Canvas or SVG."
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