• This repository has been archived on 05/Dec/2022
  • Stars
    star
    139
  • Rank 262,954 (Top 6 %)
  • Language
    Python
  • License
    Other
  • Created about 10 years ago
  • Updated over 4 years ago

Reviews

There are no reviews yet. Be the first to send feedback to the community and the maintainers!

Repository Details

Enter kernel namespaces from Python

NSEnter

Travis CI build status

NSEnter is a Python package that enables you to enter Linux kernel namespaces β€” mount, IPC, net, PID, user and UTS β€” with a single, simple "setns" syscall. The command line interface is similar to the nsenter C program.

Project Origins

When working with Docker containers, questions usually arise about how to connect into a running container without starting an explicit SSH daemon (which is considered a bad idea). One way is to use Linux Kernel namespaces, which Docker uses to restrict the view from within containers.

The util-linux package provides the nsenter command line utility, but Ubuntu 16.04 LTS unfortunately does not. JΓ©rΓ΄me Petazzoni provides a Docker recipe for nsenter on GitHub, or you can compile nsenter from source. As there is only one simple syscall to enter a namespace, we can do the call directly from within Python using the ctypes module. We bundled this syscall to create NSEnter.

Additional Links

  • "Entering Kernel Namespaces from Python," Zalando Tech blog post
  • On PyPi

Requirements

  • Python 2.6 or higher

Installation

From PyPI:

sudo pip3 install nsenter

From git source:

python3 setup.py install

Usage

Example of command line usage:

docker run -d --name=redis -t redis
sudo nsenter --all --target=`docker inspect --format '{{ .State.Pid }}' redis` /bin/bash

Example of usage from Python:

import subprocess
from nsenter import Namespace

with Namespace(mypid, 'net'):
    # output network interfaces as seen from within the mypid's net NS:
    subprocess.check_output(['ip', 'a'])

# or enter an arbitrary namespace:
with Namespace('/var/run/netns/foo', 'net'):
    # output network interfaces as seen from within the net NS "foo":
    subprocess.check_output(['ip', 'a'])

Development Status

This project works as-is. There are currently no plans to extend it, but if you have an idea please submit an Issue to the maintainers.

License

See file.

More Repositories

1

patroni

A template for PostgreSQL High Availability with Etcd, Consul, ZooKeeper, or Kubernetes
Python
6,267
star
2

postgres-operator

Postgres operator creates and manages PostgreSQL clusters running in Kubernetes
Go
3,686
star
3

skipper

An HTTP router and reverse proxy for service composition, including use cases like Kubernetes Ingress
Go
3,088
star
4

restful-api-guidelines

A model set of guidelines for RESTful APIs and Events, created by Zalando
CSS
2,605
star
5

zalenium

A flexible and scalable container based Selenium Grid with video recording, live preview, basic auth & dashboard.
Java
2,385
star
6

SwiftMonkey

A framework for doing randomised UI testing of iOS apps
Swift
1,947
star
7

logbook

An extensible Java library for HTTP request and response logging
Java
1,788
star
8

tailor

A streaming layout service for front-end microservices
JavaScript
1,728
star
9

tech-radar

Visualizing our technology choices
1,581
star
10

spilo

Highly available elephant herd: HA PostgreSQL cluster using Docker
Python
1,225
star
11

intellij-swagger

A plugin to help you easily edit Swagger and OpenAPI specification files inside IntelliJ IDEA
Java
1,172
star
12

problem-spring-web

A library for handling Problems in Spring Web MVC
Java
1,031
star
13

nakadi

A distributed event bus that implements a RESTful API abstraction on top of Kafka-like queues
Java
928
star
14

zally

A minimalistic, simple-to-use API linter
Kotlin
903
star
15

problem

A Java library that implements application/problem+json
Java
869
star
16

zalando-howto-open-source

Open Source guidance from Zalando, Europe's largest online fashion platform
799
star
17

go-keyring

Cross-platform keyring interface for Go
Go
689
star
18

gin-oauth2

Middleware for Gin Framework users who also want to use OAuth2
Go
579
star
19

zappr

An agent that enforces guidelines for your GitHub repositories
JavaScript
542
star
20

pg_view

Get a detailed, real-time view of your PostgreSQL database and system metrics
Python
494
star
21

engineering-principles

Our guidelines for building new applications and managing legacy systems
376
star
22

gulp-check-unused-css

A build tool for checking your HTML templates for unused CSS classes
CSS
359
star
23

zmon

Real-time monitoring of critical metrics & KPIs via elegant dashboards, Grafana3 visualizations & more
Shell
355
star
24

expan

Open-source Python library for statistical analysis of randomised control trials (A/B tests)
Python
325
star
25

PGObserver

A battle-tested, flexible & comprehensive monitoring solution for your PostgreSQL databases
Python
316
star
26

riptide

Client-side response routing for Spring
Java
292
star
27

jackson-datatype-money

Extension module to properly support datatypes of javax.money
Java
240
star
28

grafter

Grafter is a library to configure and wire Scala applications
Scala
240
star
29

opentracing-toolbox

Best-of-breed OpenTracing utilities, instrumentations and extensions
Java
180
star
30

elm-street-404

A fun WebGL game built with Elm
Elm
176
star
31

tokens

Java library for conveniently verifying and storing OAuth 2.0 service access tokens
Java
169
star
32

innkeeper

Simple route management API for Skipper
Scala
166
star
33

public-presentations

List of public talks by Zalando Tech: meetup presentations, recorded conference talks, slides
165
star
34

faux-pas

A library that simplifies error handling for Functional Programming in Java
Java
132
star
35

dress-code

The official style guide and framework for all Zalando Brand Solutions products
CSS
129
star
36

beard

A lightweight, logicless templating engine, written in Scala and inspired by Mustache
Scala
121
star
37

friboo

Utility library for writing microservices in Clojure, with support for Swagger and OAuth
Clojure
117
star
38

spring-cloud-config-aws-kms

Spring Cloud Config add-on that provides encryption via AWS KMS
Java
99
star
39

zalando.github.io

Open Source Documentation and guidelines for Zalando developers
HTML
86
star
40

failsafe-actuator

Endpoint library for the failsafe framework
Java
52
star
41

package-build

A toolset for building system packages using Docker and fpm-cookery
Ruby
35
star
42

ghe-backup

Github Enterprise backup at ZalandoTech (Kubernetes, AWS, Docker)
Shell
30
star
43

rds-health

discover anomalies, performance issues and optimization within AWS RDS
Go
26
star
44

backstage-plugin-api-linter

API Linter is a quality assurance tool that checks the compliance of API's specifications to Zalando's API rules.
TypeScript
12
star
45

.github

Standard github health files
1
star