Iād like to easily share my Streamlit apps to co-workers. Requirements:
How can I accomplish this?
Hi @Tong,
Thanks for sharing your question! It looks like you shared this on StackOverflow as well, and got the following answers:
The question is what kind of user the target is. If itās another coder, just create a requirements.txt file for your project and give them the source code (i.e. using an online repository like GitHub). Then they can recreate your environments and run the app via Streamlit locally themselves. If the target user is not a coder, you need to package everything, i.e. in a Docker container (see i.e. official documentation here docs.streamlit.io/knowledge-base/tutorials/deploy/docker)
Another option is to package your app as an executable ā I recommend checking out this thread.
I donāt believe that answers the OP question; I would like to think that understand the OP question because I have the same exact desire.
I too found the post in Stackoverflow; but for ready access, here is a couple of follow-up questions.
Still within the corporate environment with machines in the same network and the ability to reach each otherā¦is there a simple process for self-hosting?
For as long as upon launching, the streamlit program shows up in the browser in the one machine:
Desktop operating systems usually come with a preinstalled firewall, configured by default to block any incoming connections unless they come from localhost. You might have to configure the firewall to allow an application to listen to incoming requests in a certain port using a certain protocol.
In a corporate environment is common that IT people configure the operating system to comply with the organization policies before handing the computer to users, that are not granted the required permissions to change configurations.
If your operating system was configured by people in your org, those peple can answer your questions better than stranges in the Internet. If not, learn how to configure the firewall.
I see; thanks for that.
And no, I donāt know firewall stuff; I am not a web developer, eitherā¦thatās why I am using Streamlit 
ā¦to readily and simply convert a desktop Python program into a web-based one, to explore sharing, etc.
So, I do happen to have some additional privileges in a server box; and, late last night, I found another thread with some brief instructions on how to use docker to launch a streamlit appā¦it worked; I can now reach my app from any computer.
hello gsal, could you share in depth what you did in order to accomplish? i believe that this gonna help to benefit users
Another handy way to do this is with ngrok, which allows you to expose a local port to the internet. https://ngrok.com/
e.g.
# in one console window
streamlit run app.py
# In another
ngrok http 8501
Which generates a url that you can share with others to be able to access your app (as long as those commands keep running). Itās not ideal for all scenarios, but Iāve found it handy when just wanting to share something quickly without actually hosting it anywhere.
blackary:
I donāt know about ngrok. I think the OP and I are looking for a self-hosting option and not expose anything outside the company four walls. A brief look at ngrok webpage and it seems like it uses some server in Europe.
Tong
In my previous post, I included a link to the repo with the instructions I followedā¦they are just a few lines, so, I can include them here:
Go to your working directory
Create a file named Dockerfile, with the following contents:
FROM python:3.9-slim
WORKDIR /app
COPY requirements.txt ./requirements.txt
RUN pip install -r requirements.txt
EXPOSE 8501
COPY myapp.py ./myapp.py
ENTRYPOINT ["streamlit", "run"]
CMD ["myapp.py"]
Copy your streamlit file over and rename it myapp.py, to match reference inside Dockerfile
Build: docker build -t myapp1:latest
Run: docker run -d -p 8501:8501 --name=testgui myapp1:latest
Go to browser and use app
Stop: docker stop testgui
Remove container: docker rm testgui
Remove image: docker rmi myapp1:latest
Oopsā¦post-edit: You need the requirements.txt file, too.
So, like I said, the above steps kind of worked for me in that I was able to run the program in one machine and connect to it from another BUT, it only works onceā¦for the first user to connect to itā¦whatās up with that?
Is this issue normal?
What else does not need to do for the app to work for multiple users?
Does it mean that others are not able to access the web app when I exited anaconda prompt in my PC?
docker run ..., I do not get the prompt backstreamlit run <myapp>.py, when working locally, anyway; so,What surprises me is that even though supposedly there is some kind of web-server running, it is not able to handle more than one user; in other words, after I launch docker run... for the first time, the program only works for the one user that connects first; if a second user wants to use the program, it does not work correctly for them.
And so, in as much as I did not like the ngrok proposal, I speculate that the solution may be along those lines, i.e., some kind of additional web-server that can launch different instances of the app got subsequent users? Here is where I donāt know what I am talking about because I am not a web-developer.
FWIW, I just did what seemed to me the simplest thing that could possibly work and it actually worked.
This worked for me and I guess it should work in most domestic networks. As I said before, it may or may not work in your corporate network / with corporate devices, depending on corporate policies and how they are implemented.
Hi, Goyoā¦thanks for nothing 
Your answer is as good as āIt works for meā and it does not helpā¦would you mind showing the precise steps you followed in that āsimplest thing that could possibly workā? I really doubt that it is a network issue, it seems more of a web server issue.
By the way, I was reading the Panel docs and, interestingly enough, they mention something interesting in relation to allowing different users having their own instance of the app while visiting the same web pageā¦something about wrapping the final Python app back into a function. Panel uses the Bokeh server.
I enumerated the steps 1, 2 and 3. Let me know whatever you donāt understand. It is as simple as it looks. Launch the app in a computer (streamlit run app.py), look at the āNetwork URLā that appears in the terminal, go to another computer, open a browser and point it to the aforementioned āNetwork URLā, thatās all. I used two clients simultaneously because you said it only worked for one in your setup, so I wanted to test that.
I am not saying you are having network issues, that I donāt know. You were using docker and I barely know anything about it so I wonāt even speculate about what went wrong. It was just a warning that network issues can happen.
I donāt know about your issue about not handling multiple users, but the simplest case that @Goyo is describing is: launch your app locally the same way you always do: streamlit run my_app.py. There really arenāt any special instruction here.
Observe two things when you launch your app locally.
The terminal will report two links to your running app. One via local host and one via your ip.
The window that automatically opens up is using the localhost version. The localhost url will not work on another computer. The ip version will (provided the other computer is on the same local network and any involved firewalls allow it, etc.).
My own network is pretty locked down so I hadnāt bothered to check if anything special needed to be done to offer up the app to the network. Thanks @Goyo for doing a test.
If you can open up your app on two different tab simultaneously locally, then the app is not having an issue with multiple users. Each tab is a separate session. If accessing the app from a different computer using the ip address link causes a limit on connections, I would suspect it is a network configuration issue.
Thank you both for clarifying things up, checking and double checking.
And it was pretty consistentā¦no matter user nor machine:
So, I went back to the source code and noticed a couple of things in play.
The skeleton code looks as follows:
import streamlit as st
st.session_state.inpfile_checked = False
@st.cache
def inpfile_validate():
.
.
.
if good:
st.session_state.inpfile_checked = True
else:
st.session_state.inpfile_checked = False
inpfile = st.file_uploader("Input file", type='csv', key='inpfile')
inpfile_validate()
if st.session_state.inpfile_checked:
pass
else:
st.write('Error: Unacceptable file name.')
So, this is what I am seeing:
So, I believe this is telling me that:
After writing the last few lines above, I went ahead and tested with two different input file names; in this case, both tabs work.
Thoughts? ā¦the caching thing?
A cache only caches the final output and no action within. Furthermore, it caches relative to its inputs, so youād need to pass it the data of the file so it can cache the correct validation status for different files.
import streamlit as st
st.session_state.inpfile_checked = False
@st.cache
def inpfile_validate(uploaded_file):
.
# run check on locally defined uploaded_file variable
.
if good:
return True
else:
return False
inpfile = st.file_uploader("Input file", type='csv', key='inpfile')
st.session_state.inpfile_checked = inpfile_validate(inpfile)
if st.session_state.inpfile_checked:
pass
else:
st.write('Error: Unacceptable file name.')
Note, I didnāt run a test with the st.cache to see if it correctly identifies files as āthe sameā as youād want. Since the file uploader returns an UploadedFile object which is a subclass of BytesIO, I am guessing it will perform as desired. Just a caveat that I didnāt validate that point with testing.
Well, I just found the one line:
āThis happens because the Streamlit cache is global to all users. So everyone contributes to everyone elseās performance.ā
Between the above statement and what you and the docs mention regarding caching of inputs and outputs, one also needs to make sure that the function does not have any side effects. In my case, the side effect was changing the value of a global variable without it being an input nor an outputā¦this side effect does not happen after the function has been cached.
Correct. Your function (originally) was cached with nothing in, nothing out, so it became a dud as soon as it was first executed.
Hello @mathcatsand
Thanks alot for your solution. I have a question if you may . I want to change the network url to something more neat like www.myapp.com . Can you share with me some resources to do so?
It works. Thank you.
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