python,deployment,flask,docker,dockerfile , Deploying a minimal flask app in docker - server connection issues


Deploying a minimal flask app in docker - server connection issues

Question:

Tag: python,deployment,flask,docker,dockerfile

I have an app who's only dependency is flask, which runs fine outside docker and binds to the default port 5000. Here is the full source:

from flask import Flask

app = Flask(__name__)
app.debug = True

@app.route('/')
def main():
    return 'hi'

if __name__ == '__main__':
    app.run()

The problem is that when I deploy this in docker, the server is running but is unreachable from outside the container.

Below is my Dockerfile. The image is ubuntu with flask installed. The tar just contains the index.py listed above;

# Dockerfile
FROM dreen/flask
MAINTAINER dreen
WORKDIR /srv

# Get source
RUN mkdir -p /srv
COPY perfektimprezy.tar.gz /srv/perfektimprezy.tar.gz
RUN tar x -f perfektimprezy.tar.gz
RUN rm perfektimprezy.tar.gz

# Run server
EXPOSE 5000
CMD ["python", "index.py"]

Here are the steps I am doing to deploy

$> sudo docker build -t perfektimprezy .

As far as I know the above runs fine, the image has the contents of the tar in /srv. Now, let's start the server in a container:

$> sudo docker run -i -p 5000:5000 -d perfektimprezy
1c50b67d45b1a4feade72276394811c8399b1b95692e0914ee72b103ff54c769

Is it actually running?

$> sudo docker ps
CONTAINER ID        IMAGE                   COMMAND             CREATED             STATUS              PORTS                    NAMES
1c50b67d45b1        perfektimprezy:latest   "python index.py"   5 seconds ago       Up 5 seconds        0.0.0.0:5000->5000/tcp   loving_wozniak

$> sudo docker logs 1c50b67d45b1
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat

Yep, seems like the flask server is running. Here is where it gets weird. Lets make a request to the server:

 $> curl 127.0.0.1:5000 -v
 * Rebuilt URL to: 127.0.0.1:5000/
 * Hostname was NOT found in DNS cache
 *   Trying 127.0.0.1...
 * Connected to 127.0.0.1 (127.0.0.1) port 5000 (#0)
 > GET / HTTP/1.1
 > User-Agent: curl/7.35.0
 > Host: 127.0.0.1:5000
 > Accept: */*
 >
 * Empty reply from server
 * Connection #0 to host 127.0.0.1 left intact
 curl: (52) Empty reply from server

Empty reply... But is the process running?

$> sudo docker top 1c50b67d45b1
UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                2084                812                 0                   10:26               ?                   00:00:00            python index.py
root                2117                2084                0                   10:26               ?                   00:00:00            /usr/bin/python index.py

Now let's ssh into the server and check...

$> sudo docker exec -it 1c50b67d45b1 bash
[email protected]:/srv# netstat -an
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 127.0.0.1:5000          0.0.0.0:*               LISTEN
tcp        0      0 127.0.0.1:47677         127.0.0.1:5000          TIME_WAIT
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node   Path
[email protected]:/srv# curl -I 127.0.0.1:5000
HTTP/1.0 200 OK
Content-Type: text/html; charset=utf-8
Content-Length: 5447
Server: Werkzeug/0.10.4 Python/2.7.6
Date: Tue, 19 May 2015 12:18:14 GMT

It's fine... but not from the outside :( What am I doing wrong?


Answer:

The problem is you are only binding to the localhost interface, you should be binding to 0.0.0.0 if you want the container to be accessible from outside. If you change:

if __name__ == '__main__':
    app.run()

to

if __name__ == '__main__':
    app.run(host='0.0.0.0')

It should work.


Related:


How to check for multiple attributes in a list


python,python-2.7
I am making a TBRPG game using Python 2.7, and i'm currently making a quest system. I wanted to make a function that checks all of the quests in a list, in this case (quests), and tells you if any of of the quests in the list have the same...

Parse text from a .txt file using csv module


python,python-2.7,parsing,csv
I have an email that comes in everyday and the format of the email is always the same except some of the data is different. I wrote a VBA Macro that exports the email to a text file. Now that it is a text file I want to parse the...

ctypes error AttributeError symbol not found, OS X 10.7.5


python,c++,ctypes
I have a simple test function on C++: #include <stdio.h> #include <string.h> #include <stdlib.h> #include <locale.h> #include <wchar.h> char fun() { printf( "%i", 12 ); return 'y'; } compiling: gcc -o test.so -shared -fPIC test.cpp and using it in python with ctypes: from ctypes import cdll from ctypes import c_char_p...

How to use template within Django template?


python,html,django,templates,django-1.4
I have the django template like below: <a href="https://example.com/url{{ mylist.0.id }}" target="_blank"><h1 class="title">{{ mylist.0.title }}</h1></a> <p> {{ mylist.0.text|truncatewords:50 }}<br> ... (the actual template is quite big) It should be used 10 times on the same page, but 'external' html elements are different: <div class="row"> <div class="col-md-12 col-lg-12 block block-color-1"> *django...

Calling function and passing arguments multiple times


python,function,loops
I want to call the function multiple time and use it's returned argument everytime when it's called. For example: def myfunction(first, second, third): return (first+1,second+1,third+1) 1st call: myfunction(1,2,3) 2nd call is going to be pass returned variables: myfunction(2,3,4) and loop it until defined times. How can I do such loop?...

group indices of list in list of lists


python,list
I am looking for an elegant solution for the following problem. I have a list of ints and I want to create a list of lists where the indices with the same value are grouped together in the order of the occurrences of said list. [2, 0, 1, 1, 3,...

Matplotlib: Plot the result of an SQL query


python,sql,matplotlib,plot
from sqlalchemy import create_engine import _mssql from matplotlib import pyplot as plt engine = create_engine('mssql+pymssql://**:[email protected]:1433/AffectV_Test') connection = engine.connect() result = connection.execute('SELECT Campaign_id, SUM(Count) AS Total_Count FROM Impressions GROUP BY Campaign_id') for row in result: print row connection.close() The above code generates an array: (54ca686d0189607081dbda85', 4174469) (551c21150189601fb08b6b64', 182) (552391ee0189601fb08b6b73', 237304) (5469f3ec0189606b1b25bcc0',...

Python recursive function not recursing


python,recursion
I'm trying to solve a puzzle, which is to reverse engineer this code, to get a list of possible passwords, and from those there should be one that 'stands out', and should work function checkPass(password) { var total = 0; var charlist = "abcdefghijklmnopqrstuvwxyz"; for (var i = 0; i...

Python np.delete issue


python,numpy
A = np.array([[1,2,3],[3,4,5],[5,6,7]]) X = np.array([[0, 1, 0]]) for i in xrange(np.shape(X)[0]): for j in xrange(np.shape(X)[1]): if X[i,j] == 0.0: A = np.delete(A, (j), axis=0) I am trying to delete j from A if in X there is 0 at index j. I get IndexError: index 2 is out of...

REGEX python find previous string


python,regex,string
I'm trying to find if the last word of the string is followed by a space or a special char, and if yes return the string without this space/special char For example : "do you love dogs ?" ==> return "do you love dogs" "i love my dog " (space...

Count function counting only last line of my list


python,python-2.7
Count function counting only last line of my list N = int(raw_input()) cnt = [] for i in range(N): string = raw_input() for j in range(1,len(string)): if string[j] =='K': cnt.append('R') elif string[j] =='R': cnt.append('R') if string[0] == 'k': cnt.append('k') elif string[0] == 'R': cnt.append('R') print cnt.count('R') if I am giving...

Inserting a variable in MongoDB specifying _id field


python,mongodb,pymongo
I want to insert a variable, say, a = {1:2,3:4} into my database with a particular id "56". It is very clear from the docs that I can do the following: db.testcol.insert({"_id": "56", 1:2, 3:4}) However, I cannot figure out any way to insert "a" itself, specifying an id. In...

Inconsistency between gaussian_kde and density integral sum


python,numpy,kernel-density
Can one explain why after estimation of kernel density d = gaussian_kde(g[:,1]) And calculation of integral sum of it: x = np.linspace(0, g[:,1].max(), 1500) integral = np.trapz(d(x), x) I got resulting integral sum completely different to 1: print integral Out: 0.55618 ...

Pandas Dataframe Complex Calculation


python,python-2.7,pandas,dataframes
I have the following dataframe,df: Year totalPubs ActualCitations 0 1994 71 191.002034 1 1995 77 2763.911781 2 1996 69 2022.374474 3 1997 78 3393.094951 I want to write code that would do the following: Citations of currentyear / Sum of totalPubs of the two previous years I want something to...

How to put an image on another image in python, using ImageTk?


python,user-interface,tkinter
I want to put an image in front of another one, then use this combined image as a button's background image in Tkinter. How can I do it? I am free to import Tkimage, Image. Clarify: I want to stick this on the center of this so that something like...

Can't get value from xpath python


python,html,xpath,web-scraping,html-parsing
I want to get values from page: http://www.tabele-kalorii.pl/kalorie,Actimel-cytryna-miod-Danone.html I can get all values from first section, but I can't get values from table "Wartości odżywcze" I use this xpath: ''.join(tree2.xpath("//html/body/div[1]/div[3]/article/div[2]/div/div[4]/div[3]/div/div[1]/div[3]/table[1]/tr[3]/td[2]/span/text()")) But I'm not getting anything. With xpath like this: ''.join(tree2.xpath("//html/body/div[1]/div[3]/article/div[2]/div/div[4]/div[3]/div/div[1]/div[3]/table[1]/tr[3]/td[2]//text()")) I'm...

Strange Behavior: Floating Point Error after Appending to List


python,python-2.7,behavior
I am writing a simple function to step through a range with floating step size. To keep the output neat, I wrote a function, correct, that corrects the floating point error that is common after an arithmetic operation. That is to say: correct(0.3999999999) outputs 0.4, correct(0.1000000001) outputs 0.1, etc. Here's...

Using counter on array for one value while keeping index of other values


python,collections
After reading the answers on this question How to count the frequency of the elements in a list? I was wondering how to count the frequency of something, and at the same time retreive some extra information, through something like an index. For example a = ['fruit','Item#001'] b = ['fruit','Item#002']...

Python Popen - wait vs communicate vs CalledProcessError


python,python-2.7,error-handling,popen
Continuing from my previous question I see that to get the error code of a process I spawned via Popen in python I have to call either wait() or communicate() (which can be used to access the Popen stdout and stderr attributes): app7z = '/path/to/7z.exe' command = [app7z, 'a', dstFile.temp,...

Sum of two variables in RobotFramework


python,automated-tests,robotframework
I have two variables: ${calculatedTotalPrice} = 42,42 ${productPrice1} = 43,15 I executed ${calculatedTotalPrice} Evaluate ${calculatedTotalPrice}+${productPrice1} I got 42,85,15 How can I resolve it?...

MySQLdb Python - Still getting error when using CREATE TABLE IF NOT EXISTS


python,mysql
I'm using this code to create a database with tables in Python: def CreateDatabase(): global DB_CNX global DB_NAME cursor = DB_CNX.cursor() cursor.execute("""CREATE DATABASE IF NOT EXISTS {} DEFAULT CHARACTER SET 'utf8'""".format(DB_NAME)) cursor.execute("""CREATE TABLE IF NOT EXISTS NAMES(NAME VARCHAR(50) PRIMARY KEY NOT NULL)""") DB_CNX.close() But even if I use the syntax...

odoo v8 - Field(s) `arch` failed against a constraint: Invalid view definition


python,xml,view,odoo,add-on
I want to create a new view with a DB-view. When I try to install my app, DB-view was created then I get error: 2015-06-22 12:59:10,574 11988 ERROR odoo openerp.addons.base.ir.ir_ui_view: Das Feld `datum` existiert nicht Fehler Kontext: Ansicht `overview.tree.view` [view_id: 1532, xml_id: k. A., model: net.time.overview, parent_id: k. A.] 2015-06-22...

How do variables inside python modules work?


python,module,python-module
I am coming from a Java background with Static variables, and I am trying to create a list of commonly used strings in my python application. I understand there are no static variables in python so I have written a module as follows: import os APP_NAME = 'Window Logger' APP_DATA_FOLDER_PATH...

Create an exe with Python 3.4 using cx_Freeze


python,python-3.4,cx-freeze
I have found two other articles about this problem on Stack Exchange but none of them has a clear answer: is it possible to create a .exe of a Python 3.4 script? The only solution I found was to use cx_Freeze. I used it, and it indeed created an executable...

Python - Opening and changing large text files


python,replace,out-of-memory,large-files
I have a ~600MB Roblox type .mesh file, which reads like a text file in any text editor. I have the following code below: mesh = open("file.mesh", "r").read() mesh = mesh.replace("[", "{").replace("]", "}").replace("}{", "},{") mesh = "{"+mesh+"}" f = open("p2t.txt", "w") f.write(mesh) It returns: Traceback (most recent call last): File...

represent an index inside a list as x,y in python


python,list,numpy,multidimensional-array
I have a list which contains 1000 integers. The 1000 integers represent 20X50 elements of dimensional array which I read from a file into the list. I need to walk through the list with an indicator in order to find close elements to each other. I want that my indicator...

In sklearn, does a fitted pipeline reapply every transform?


python,scikit-learn,pipeline,feature-selection
Apologies if this is obvious but I couldn't find a clear answer to this: Say I've used a pretty typical pipeline: feat_sel = RandomizedLogisticRegression() clf = RandomForestClassifier() pl = Pipeline([ ('preprocessing', preprocessing.StandardScaler()), ('feature_selection', feat_sel), ('classification', clf)]) pl.fit(X,y) Now when I apply pl on a new set, pl.predict(X_classify); is RandomizedLogisticRegression going...

Displaying a 32-bit image with NaN values (ImageJ)


python,image-processing,imagej
I wrote a multilanguage 3-D image denoising ImageJ plugin that does some operations on an image and returns the denoised image as a 1-D array. The 1-D array contains NaN values (around the edges). The 1-D array is converted back into an image stack and displayed. It is simply black....

Twilio Client Python not Working in IOS Browser


javascript,python,ios,flask,twilio
I have created a simple twilio client application to make phone calls from Web Browser to phones. I used a sample Flask app to generate a secure Capability Token and used twilio.min.js library to handle calls from my HTML. The functionality works fine in Computer Browsers ans Android Phone Browsers,...

How does the class_weight parameter in scikit-learn work?


python,scikit-learn
I am having a lot of trouble understanding how the class_weight parameter in scikit-learn's Logistic Regression operates. The Situation I want to use logistic regression to do binary classification on a very unbalanced data set. The classes are labelled 0 (negative) and 1 (positive) and the observed data is in...

Why does the update method in Tkinter cause the window to freeze?


python,tkinter,tkinter-canvas
First of all, I know Tkinter isn't thread safe and this problem has something to do with that but I wanted to find out formally why this code makes a window that displays but is unresponsive. from Tkinter import * root = Tk() c = Canvas() c.pack() c.create_line(10,10, 30, 30)...

The event loop is already running


python,python-3.x,pyqt,pyqt4
I have the following 5 files: gui.py # -*- coding: utf-8 -*- from PyQt4 import QtCore, QtGui try: _fromUtf8 = QtCore.QString.fromUtf8 except AttributeError: def _fromUtf8(s): return s try: _encoding = QtGui.QApplication.UnicodeUTF8 def _translate(context, text, disambig): return QtGui.QApplication.translate(context, text, disambig, _encoding) except AttributeError: def _translate(context, text, disambig): return QtGui.QApplication.translate(context, text, disambig)...

Find the tf-idf score of specific words in documents using sklearn


python,scikit-learn,tf-idf
I have code that runs basic TF-IDF vectorizer on a collection of documents, returning a sparse matrix of D X F where D is the number of documents and F is the number of terms. No problem. But how do I find the TF-IDF score of a specific term in...

Django: html without CSS and the right text


python,html,css,django,url
First of all, this website that I'm trying to build is my first, so take it easy. Thanks. Anyway, I have my home page, home.html, that extends from base.html, and joke.html, that also extends base.html. The home page works just fine, but not the joke page. Here are some parts...

Pandas - Dropping multiple empty columns


python,pandas
I have some tables where the first 11 columns are populated with data, but all columns after this are blank. I tried: df=df.dropna(axis=1,how='all') which didn't work. I then used: df = df.drop(df.columns[range(11,36)], axis=1) Which worked on the first few tables, but then some of the tables were longer or shorter...

How to remove structure with python from this case?
python,python-2.7
How to remove "table" from HTML using python? I had case like this: paragraph = ''' <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quidem molestiae consequuntur officiis corporis sint.<br /><br /> <table> <tr> <td> text title </td> <td> text title 2 </td> </tr> </table> <p> lorem ipsum</p> ''' how...

How to change the IP address of Amazon EC2 instance using boto library


python,amazon-web-services,boto
How can I assign a new IP address (or Elastic IP) to an already existing AWS EC2 instance using boto library.

Python: histogram/ binning data from 2 arrays.


python,histogram,large-files
I have two arrays of data: one is a radius values and the other is a corresponding intensity reading at that intensity: e.g. a small section of the data. First column is radius and the second is the intensities. 29.77036614 0.04464427 29.70281027 0.07771409 29.63523525 0.09424901 29.3639355 1.322793 29.29596385 2.321502 29.22783249...

Spring-integration scripting with Python


python,spring-integration,jython
I'm trying to use Python with spring-integration and jython-standalone-2.7.0: Here is my application context: <int:inbound-channel-adapter id="in" channel="exampleChannel" > <int:poller fixed-rate="1000" /> <int-script:script lang="python" location="script/message.py" /> </int:inbound-channel-adapter> <int:channel id="exampleChannel" /> <int-ip:udp-outbound-channel-adapter id="udpOut" channel="exampleChannel" host="192.168.0.1" port="11111" /> Here is my script in Python: print "Python"...

Peewee: reducing where conditionals break after a certain length


python,peewee
This is what I have: SomeTable.select.where(reduce(operator.or_, (SomeTable.stuff == entry for entry in big_list))) The problem arises when I have a relatively large list of elements in big_list and I get this: RuntimeError: maximum recursion depth exceeded Is there another way to approach this that doesn't involve splitting up the list...

SQLAlchemy. 2 different relationships for 1 column


python,sqlalchemy
I have a simple many-to-many relationship with associated table: with following data: matches: users: users_mathces: ONE user can play MANY matches and ONE match can involve up to TWO users I want to realize proper relationships in both "Match" and "User" classes users_matches_table = Table('users_matches', Base.metadata, Column('match_id', Integer, ForeignKey('matches.id', onupdate="CASCADE",...

Identify that a string could be a datetime object


python,regex,algorithm,python-2.7,datetime
If I knew the format in which a string represents date-time information, then I can easily use datetime.datetime.strptime(s, fmt). However, without knowing the format of the string beforehand, would it be possible to determine whether a given string contains something that could be parsed as a datetime object with the...

How do I read this list and parse it?


python,list
I'm using requests and the output I get from the sites API is a list, I've been stuck trying to parse it to get the data from it. I use r = requests.get(urlas, params=params) r.json() to get the data I want. Here is a snippet of the list [{'relation_type': None,...

Replace nodejs for python?


python,node.js,webserver
i'm working in a HTML5 multiplayer game, and i need a server to sync player's movement, chat, battles, etc. So I'm looking for ways to use python instead nodejs, because i have I have more familiarity with python. The server is simple: var express = require('express'); var app = express();...

how to enable a entry by clicking a button in Tkinter?


python,tkinter
I need to activate many entries when button is clicked please do not write class based code, modify this code only because i need to change the whole code for the project as i did my whole project without classes from Tkinter import * import ttk x='disabled' def rakhi(): global...

Sort when values are None or empty strings python


python,list,sorting,null
I have a list with dictionaries in which I sort them on different values. I'm doing it with these lines of code: def orderBy(self, col, dir, objlist): if dir == 'asc': sorted_objects = sorted(objlist, key=lambda k: k[col]) else: sorted_objects = sorted(objlist, key=lambda k: k[col], reverse=True) return sorted_objects Now the problem...

Python: can't access newly defined environment variables


python,bash,environment-variables
I can't access my env var: import subprocess, os print os.environ.get('PATH') # Works well print os.environ.get('BONSAI') # doesn't work But the env var is well added in my /home/me/.bashrc: BONSAI=/home/me/Utils/bonsai_v3.2 export BONSAI And I can access this env var from a new terminal....

trying to understand LSH through the sample python code


python,similarity,locality-sensitive-hash
the concise python code i study for is here Question A @ line 8 i do not really understand the syntax meaning for "res = res << 1" for the purpose of "get_signature" Question B @ line 49 (SOLVED BY myself through another Q&A) "xor = r1^r2" does not really...

SyntaxError: invalid syntax?


python,syntax
Good afternoon, I am developing a script in python and while I am trying to compile it from the terminator/terminal i always get this error, but I cannot understand where is the syntax error? File "_case1.py", line 128 print ('########################') ^ SyntaxError: invalid syntax Then I just change the position...

sys.argv in a windows environment


python,windows,python-3.x
I'm attempting to learn python using the book 'a byte of python'. The code: import sys print('the command line arguments are:') for i in sys.argv: print(i) print('\n\nThe PYTHONPATH is', sys.path, '\n') outputs: the command line arguments are: C:/Users/user/PycharmProjects/helloWorld/module_using_sys.py The PYTHONPATH is ['C:\\Users\\user\\PycharmProjects\\helloWorld', 'C:\\Users\\user\\PycharmProjects\\helloWorld', 'C:\\Python34\\python34.zip', 'C:\\Python34\\DLLs', 'C:\\Python34\\lib', 'C:\\Python34', 'C:\\Python34\\lib\\site-packages']...