whelaunch.blogg.se - Docker unix domain socket

DOCKER UNIX DOMAIN SOCKET FULL

Or like this (Apache): ProxyPass / unix:/tmp/datasette.sock| Writing tests More importantly, it means you can configure nginx or Apache to proxy to the Datasette server like this (nginx):

I’ve added a new -uds option, so now you can run Datasette like this: datasette -uds /tmp/datasette.sock fixtures.dbĭatasette will “listen” on /tmp/datasette.sock-which means you can run requests via curl like so: curl -unix-socket /tmp/datasette.sock \

DOCKER UNIX DOMAIN SOCKET FULL

Implementing this in Datasetteĭatasette uses the excellent Uvicorn Python web server to serve traffic out of the box, and Uvicorn already includes support for UDS-so adding support to Datasette was pretty easy-here’s the full implementation. It turns out both nginx and Apache have the ability to proxy traffic to a Unix domain socket rather than to an HTTP port, which makes this a useful mechanism for running backend servers without attaching them to TCP ports. Plenty more examples in the Docker documentation if you click the ’HTTP’ tab. I’ve encountered these before with the Docker daemon, which listens on path /var/run/docker.sock and can be communicated with using curl like so: curl -unix-socket /var/run/docker.sock \ Unix domain sockets provide a mechanism whereby different processes on a machine can communicate with each over over a mechanism similar to TCP, but via a file path instead. I’ve not worked with these much before so it was a good opportunity to learn something new. This started out as a feature request from Aslak Raanes: #1388: Serve using UNIX domain socket. To learn more about docker-compose, see the documentation.A small enhancement to Datasette this week: I’ve added support for proxying via Unix domain sockets. It takes two parameters, the uid and the gui: 1 #!/usr/bin/bashħ 8 9 function main "Īt this point, all we have to do is use this Dockerfile. It will change the uid and gid for the uwsgi user inside the container. First, let's create a setup.sh script next to your Dockerfile.

groupmod to change the gid of a user: groupmod -g.

usermod to change the uid of a user: usermod -u.

You can pass an optional username to get the uid and gid for a specific user: id -u nginx.

id to get the uid and gid of a user: id -u will give you the uid of the current user and id -g the gid of the current user.

Depending on where we do ls -l we'll get different human readable names but the permissions will be correct. So what we need to do, is make sure that both the nginx user (in the host system) and the uwsgi user (in the container) have the same uid (and gid). They are encoded in the filesystem as numbers respectively named uid and gid. What you must know is: the names are just the human readable version of these attributes. Here we have a file named README.md that belongs to a user named jujens and a group named jujens. 1 jujens jujens 366 Sep 12 14:13 README.md

In Unix each file has a owner and a group.

The question is, how do we fullfil these two requirements? First, let's explain how file ownership works.

To belong to the nginx user outside it, so nginx can use it.

To belong to the uwsgi user inside the container so your application can use it.

You want it to use a Unix socket to communicate with your nginx webserver running on the host under the nginx user. It will run in the container as the uwsig user. Let's say you are creating a Python web application running in a container with UWSGI. The tricky part is to set the proper permissions on the socket. You can them use it for your webserver to talk to your application or for cross container communications. But what if you want to use Unix sockets instead? The answer is you can: you make the application create the socket file in a volume and set the proper permissions to it. By default, you are supposed to use TCP sockets to communicate with your applications running in Docker.