add python multiple processes article #44
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runnabro
commented
Oct 13, 2016
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| ### Phusion base image | ||
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| The simplest way to get started is to use [phusion-baseimage](https://github.com/phusion/baseimage-docker "https://github.com/phusion/baseimage-docker") |
runnabro
commented
Oct 13, 2016
| #### app1.sh | ||
| This is the runit script for our first app. We send the output to STDOUT so that the Docker logs can handle it. Without <a href="https://en.wikipedia.org/wiki/Shebang_(Unix)">shebang</a> (`#!/bin/sh`), the following error will occur: `runsv app1: fatal: unable to start ./run: exec format error` | ||
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| Again, we send the output to STDOUT so that the Docker logs can handle it. |
runnabro
commented
Oct 13, 2016
| ``` | ||
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| #### app2.sh | ||
| App2 runit script |
runnabro
commented
Oct 13, 2016
| exec python /app2.py >> /dev/stdout 2>&1 | ||
| ``` | ||
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| #### Note for windows users: |
runnabro
commented
Oct 13, 2016
| tags: | ||
| - docker | ||
| - python | ||
| excerpt: Although Docker best practices recommend running one application per container, you may need to run a multiprocess app or create a standalone multi-app Docker image. |
runnabro
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Oct 13, 2016
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| ### 2. Signal handling | ||
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| By default, PID1 ignores the interrupt `SIGINT` and the termination signal `SIGTERM`. In response to the `docker stop` command (which sends `SIGTERM` to your container's PID1), you must relay `SIGTERM` to all your running processes to terminate them cleanly. |
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Editor Comment:
The second sentence is unclear. Please review my changes to make sure the meaning has been preserved. In particular:
"...PID1 must relay this signal..."
Which signal?
runnabro
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Oct 13, 2016
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| If you do not need process supervision, you can use [tini](https://github.com/krallin/tini "https://github.com/krallin/tini") as a lightweight init process. Tini also handles signals. | ||
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| [S6](http://skarnet.org/software/s6/ "http://skarnet.org/software/s6/") is a complete solution: a minimal process supervisor that also acts as an init process. |
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Editor Comment:
"...a minimal process supervisor..."
What does "minimal" mean in this context?
runnabro
commented
Oct 13, 2016
| #### app1.sh | ||
| This is the runit script for our first app. We send the output to STDOUT so that the Docker logs can handle it. Without <a href="https://en.wikipedia.org/wiki/Shebang_(Unix)">shebang</a> (`#!/bin/sh`), the following error will occur: `runsv app1: fatal: unable to start ./run: exec format error` | ||
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| Again, we send the output to STDOUT so that the Docker logs can handle it. |
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Editor Comment:
"We send the output to STDOUT so that the Docker logs can handle it."
What is "it"?
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Editor Comment: