Running SSH script during Microsoft Azure Web App deployment - azure

I am deploying a web app using the Python-Django framework to Microsoft Azure.
I have succeeded in deploying it, but every time I deploy, I have to open the Azure SSH tool and run the command apt-get install libgtk2.0-dev which I gather is some Linux dependency for the opencv-python image processing library.
I wonder if there is a way to install the required software using deploy.sh files.
deploy.sh
echo "Running Linux Deployment Script..."
apt-get update && apt install -y libxrender1 libxext6
apt-get install -y libfontconfig1
apt-get install libgtk2.0-dev
Thanks in advance for your help.

You can create a script to install libgtk2.0-dev, say test.sh under /home/site.
And then add an app setting under 'Configuration' called PRE_BUILD_SCRIPT_PATH with /home/site/test.sh as the value.

You can run a script on every Webapp startup. Just adjust your script as described here: https://stackoverflow.com/a/69923647/2606766
Create a start.sh file, e.g. like this:
# install package & start app
apt-get update -y
apt install -y libxrender1 libxext6
apt-get install -y libfontconfig1
apt-get install libgtk2.0-dev
# don't forget to start your webapp service at the end of this script, e.g.:
python manage.py runserver
Set it as your startup script:
Note: There are two pitfalls to this approach:
The script must be executable, so either install w/ unix and chmod 755 start.sh or use a git command (see SO).
The packages are installed on every startup, thus you depend on external servers/repositories when starting the webapp.

You can set SCM_POST_DEPLOYMENT_ACTIONS_PATH environment variable to configure a folder. All scripts in this folder will be executed after deployment. As far as I can see this should work both on Windows and Linux.
If you need root permissions then I would suggest to use a custom docker container which has these packages already installed.

You can start by adding this command directly to the startup script, As mentioned in the answer by #HeyMan. But instead of adding a file just add the command there apt-get update && apt install -y libxrender1 libxext6 && apt-get install -y libfontconfig1 && apt-get install libgtk2.0-dev
Add this command in a single line there.
If this method also does not work for you, then you should follow the container based approach.
Create a dockerfile and add all the required dependency there.
docker build to create a docker image.
Push that image to Azure container registry using docker push
Instead of deploying from local git, deploy with help of docker.
Look at this link for help
https://learn.microsoft.com/en-us/azure/container-registry/container-registry-get-started-docker-cli?tabs=azure-cli

Related

Azure: How to create an environment where the VM has a special package installed?

I am about to deploy a model on Azure but the model needs a special package installed on Ubuntu. My model is written in python and I have a python-wrapper installed (and other necessary pip packages) already in the environment.
The challenge is that the wrapper needs the special package to be installed on the Ubuntu. How and at what point I need to specify what packages I want to be installed on Ubuntu when creating the environment? The package is not a default one.
The following code snippet helped me to solve this. Just substitute the package you want to install into "<'package-1'>".
FROM <prebuilt docker image from MCR>
# Switch to root to install apt packages
USER root:root
RUN apt-get update && \
apt-get install -y \
**<package-1>** \
...
<package-n> && \
apt-get clean -y && \
rm -rf /var/lib/apt/lists/*
# Switch back to non-root user
USER dockeruser
The complete tutorial can be found here: https://learn.microsoft.com/en-us/azure/machine-learning/how-to-extend-prebuilt-docker-image-inference

Azure functions - there is chance to install packages via apt-get?

My azure functions needs some linux package to work, but i cant install them by apt-get, because i get error "sudo command not found" or "(Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied).
So my question is: There is any chance to install these packages without sudo?
Im using Bash in Azure App Service(kudu)
You can build and run your Azure Functions from a custom container. This way you can also install other packages.
This sample project does pretty much exactly that.
FROM mcr.microsoft.com/azure-functions/node:2.0
ENV AzureWebJobsScriptRoot=/home/site/wwwroot \
AzureFunctionsJobHost__Logging__Console__IsEnabled=true
COPY . /home/site/wwwroot
# Install FFMPEG
RUN apt-get update && \
apt-get install -y ffmpeg
RUN cd /home/site/wwwroot && \
npm install
Source

Running 'install' command on dockerised App Service in Azure

I have a web API dockerized and published from Visual Studio. All I had to do was to choose the system (Linux it was) and hit publish.
Now the problem is I have to run command
RUN apt-get install -y libc6-dev
on my docker container but I can't find any access to it. Does any of you know how to install 'libc5-dev' on that kind of instance?
You can either include the installation command within your docker file in order to get libc6-dev installed e. g.:
FROM YOURIMAGE
RUN apt-get install -y libc6-dev
Or you can choose a different base image that already has libc6-dev installed.

Determine if Chrome is installed on a Linux VM

I am setting up a CI/CD pipeline for an Angular application. Part of this pipeline will run some end-to-end/UI tests, using Protractor and Chrome. The pipeline script is written using Groovy, and the CI/CD software is Jenkins.
Currently, the VM doesn't have Chrome or ChromeDriver installed, and I can't access it over ssh. Further, I'm not entirely sure if the VM is always the same, each time the pipeline is run. So I think the best way to make sure Chrome is installed is to check at the top of the Groovy script, and if it's not, then to install it. I've found these instructions for installing Chrome on a Linux VM:
sudo apt-get install libxss1 libappindicator1 libindicator7
wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
sudo dpkg -i google-chrome*.deb
sudo apt-get install -f
sudo apt-get install xvfb
sudo apt-get install unzip
wget -N http://chromedriver.storage.googleapis.com/2.20/chromedriver_linux64.zip
unzip chromedriver_linux64.zip
chmod +x chromedriver
sudo mv -f chromedriver /usr/local/share/chromedriver
sudo ln -s /usr/local/share/chromedriver /usr/local/bin/chromedriver
sudo ln -s /usr/local/share/chromedriver /usr/bin/chromedriver
sudo apt-get install python-pip
(source)
But I don't want to have run this every time, as it's likely that Chrome will already be installed. So how would I check in the Groovy script and then only run it if necessary? I'm pretty inexperienced with this stuff (I'm a front-end dev) so if I've made any mistakes or there are better ways to do this, please let me know!
EDIT: would a better way be to install ChromeDriver with npm? Should ChromeDriver be included in the package.json devDependencies?

How to run vi on docker container?

I have installed docker on my host virtual machine. And now want to create a file using vi.
But it's showing me an error:
bash: vi: command not found
login into container with the following command:
docker exec -it <container> bash
Then , run the following command .
apt-get update
apt-get install vim
The command to run depends on what base image you are using.
For Alpine, vi is installed as part of the base OS. Installing vim would be:
apk -U add vim
For Debian and Ubuntu:
apt-get update && apt-get install -y vim
For CentOS, vi is usually installed with the base OS. For vim:
yum install -y vim
This should only be done in early development. Once you get a working container, the changes to files should be made to your image or configs stored outside of your container. Update your Dockerfile and other files it uses to build a new image. This certainly shouldn't be done in production since changes inside the container are by design ephemeral and will be lost when the container is replaced.
USE THIS:
apt-get update && apt-get install -y vim
Explanation of the above command
apt-get update => Will update the current package
apt-get install => Will install the package
-y => Will by pass the permission, default permission will set to Yes.
vim => Name of the package you want to install.
Your container probably haven't installed it out of the box.
Run apt-get install vim in the terminal and you should be ready to go.
Add the following line in your Dockerfile then rebuild the docker image.
RUN apt-get update && apt-get install -y vim
Alternatively, keep your docker images small by not installing unnecessary editors. You can edit the files over ssh from the docker host to the container:
vim scp://remoteuser#container-ip//path/to/document
error:: bash: vi: command not found
run the below command by logging as root user to the container--
docker exec --user="root" -it (container ID) /bin/bash
apt-get update
apt-get install vim
Use below command in Debian based container:
apt-get install vim-tiny
Complete instruction for using in Dockerfile:
RUN apt-get update && apt-get install --no-install-recommends -y \
vim-tiny \
&& apt-get clean && rm -rf /var/lib/apt/lists/*
It doesn't install unnecessary packages and removes unnecessary downloaded files, so your docker image size won't increase dramatically.
The most voted answer has the correct idea, however, it did not work in my case. The comment from #java25 did the trick in my case. I had to log into the docker container as a root user to install vim. I am just posting the comment as an answer so that it is easier for others, having the similar problem, to find it.
docker exec -ti --user root <container-id> /bin/bash
Once you are inside docker, run the following commands now to install vi.
apt-get update
apt-get install vim
To install within your Docker container you can run command
docker exec apt-get update && apt-get install -y vim
But this will be limited to the container in which vim is installed.
To make it available to all the containers, edit the Dockerfile and add
RUN apt-get update && apt-get install -y vim
or you can also extend the image in the new Dockerfile and add above command. Eg.
FROM < image name >
RUN apt-get update && apt-get install -y vim
Inside container (in docker, not in VM), by default these are not installed.
Even apt-get, wget will not work. My VM is running on Ubuntu 17.10. For me yum package manager worked.
Yum is not part of Debian or ubuntu. It is part of red-hat. But, it works in Ubuntu and it is installed by default like apt-get
To install vim, use this command
yum install -y vim-enhanced
To uninstall vim :
yum uninstall -y vim-enhanced
Similarly,
yum install -y wget
yum install -y sudo
-y is for assuming yes if prompted for any question asked after doing yum install package-name
error:: bash: vim: command not found
Run the below command by logging as root user to the container:
microdnf install -y vim
If you actually want a small editor for simple housekeeping in a docker, use this in your Dockerfile:
RUN apt-get install -y busybox && ln -s /bin/busybox /bin/vi
I used it on an Ubuntu 18 based docker.
(Of course you might need an RUN apt-get update before it but if you are making your own Docker file you probably already have that.)
Usually changing a file in a docker container is not a good idea. Everyone will forget about the change after a while. A good way is to make another docker image from the original one.
Say in a docker image, you need to change a file named myFile.xml under /path/to/docker/image/. So, you need to do.
Copy myFile.xml in your local filesystem and make necessary changes.
Create a file named 'Dockerfile' with the following content-
FROM docker-repo:tag
ADD myFile.xml /path/to/docker/image/
Then build your own docker image with docker build -t docker-repo:v-x.x.x .
Then use your newly build docker image.

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