Run multiple scripts in docker image
docker run multiple processes
docker entrypoint multiple commands
run multiple apps in one docker container
docker run process in background
docker exec multiple commands
docker run multiple containers
Hi i am wondering if it possible to run two scripts in same time automaticly on docker container start . First script have to run client application, and the second run server app as background.
As mentioned having multiple processes is not a suggested practice.
Nevertheless, in some scenarios is required to have multiple processes. In those cases the usual approach is to use a process manager like supervisor.
Run multiple services in a container, If you need to run more than one service within a container, you can accomplish this in a few different ways. Put all of your commands in a wrapper script, complete Run multiple services in a container Estimated reading time: 4 minutes A container’s main running process is the ENTRYPOINT and/or CMD at the end of the Dockerfile.It is generally recommended that you separate areas of concern by using one service per container.
You can use
CMD in your
Dockerfile and use
command & to run two command in parallel:
CMD server_command & client_command
server_command is the command used to start the server and
client_command is the command used to start the client)
Docker - container with multiple images, use a process manager such as supervisord (Docker documentation here). Re-run the build.ps1 script and you should again get a new generic image. Use your new generic image. Again, specify your generic image to New-BcContainer using the -useGenericImage parameter: New-BcContainer -accept_eula -containerName mytest -artifactUrl (get-bcartifacturl -type onprem -country w1) -useGenericImage mygeneric:latest
Docker's official stance on this has always been that it is best to only have a single service running in a container. Having said that, they also maintain very robust documentation outlying possible solutions for getting multiple services into a single container.
A quick summary is essentially that when you have multiple services, you need to have some type of "init" process to act as a parent for all the services in the container.
There's two ways to do this:
- Have a shell script that runs each service as a background job.
- Launch a full init system inside the container and launch the services under this.
Both are problematic. The first because bash is not an init system, and you can end up with all kinds of headaches when it doesn't act like one. The second because an init system is a pretty heavy duty thing to put into a docker container.
Having said all that, the best solution is to split your services into two containers.
How can I run multiple Docker containers?, Can we run more than one process in a Docker container? I am trying to create a shell script for setting up a docker container. My script file looks like: #!bin/bash docker run -t -i -p 5902:5902 --name "mycontainer" --privileged myImage:new /bin/bash Running this script file will run the container in a newly invoked bash.
Why can't I use Docker CMD multiple times to run multiple services , I'm trying to execute multiple commands like this. docker run image cd /some/path && python a.py But I get a "No such file or directory" error. use volumes and mount the file during container start docker run -v my.ini:/etc/mysql/my.ini percona (and similar with docker-compose). Be aware, you can repeat this as often as you like, so mount several configs into your container (so the runtime-version of the image).
How to run multiple commands in docker at once?, Consequently, most base images lack support for standard system services and do not provide a standard way to run several commands simultaneously. Although FROM creates a layer from the ubuntu:18.04 Docker image. COPY adds files from your Docker client’s current directory. RUN builds your application with make. CMD specifies what command to run within the container. When you run an image and generate a container, you add a new writable layer (the “container layer”) on top of the underlying
Run Multiple Processes in a Container, Supervisor is responsible for starting child programs at its own invocation, responding to commands from clients, restarting crashed or exited It’s easy to mistakenly end up with multiple Python interpreters in your Docker image. When that happens, you might install your code with interpreter A, but try to run it with interpreter B—which then can’t find the code. Here’s a somewhat contrived example of how this happens:
- I achieved this using process manager (in my case circus, but there are other similar solutions). It makes sense for long-running processes (seems its your case). Also it adds benefit that if you do not handle some error in you application and it stops due to this exception, circus will restart it. As a downside (for some cases), it's python application, so it needs python runtime and needed libraries to be installed into you docker container.
- Can you not just use 2 containers?
- Ok Kami but only one app is python. Ben i have to use one container
- @ProgShiled, it's not a problem that only one app is python. You can run any script/app with this approach. Actually I've been running Java applications with such a process manager in docker container.
- Note that the container will exit when
client_commandcompletes, Docker won't notice if
server_commandexits unexpectedly, and commands like
docker stopwon't send a signal to either process.