How to Restart Azure iotedge service from inside a python module - azure

I am working on a solution where I have to restart the azure edge runtime if one issue arrives inside the container.
Generally, the way to restart the azure iotedge service is, to run the bellow command in the host terminal
sudo ststemctl restart iotedge
how to achieve this inside of the container?

So you are running containers within containers? I have never tried this. While this seems possible, note that it requires granting docker extra privileges and may present security concerns.
Generally, the way to restart the azure iotedge service is, to run the bellow command in the host terminal
You should be able to exec inside the container and do the same thing right?

The solution that i have found for this solution is -
https://learn.microsoft.com/en-us/answers/questions/40541/rebooting-edge-device-remotely.html

I would let my module die using exit() so that iot edge runtime automatically restarts my module. I would also log the error before initiating exit().
I like to know if there is a reason for restarting whole edge runtime run just to recover from an issue in a container.

Related

When is a Docker Service Considered to be Running?

I am working on a debian based container which runs a c++ compiled application as a child process to a node.js script. For testing, I am attempting to define a swarm that instantiates this container as a service. When I run "docker service ls", it reports that the service is no running. If I issue "docker ps", however, I can see the identifier for the container and I can use "docker exec" to connect to it.
So far as I can see, the two target processes are running within the container yet, when other containers within the same swarm and using the same networks attempt to connect to this server, I see a name resolution error.
Here is my question: If the intended processes are actively and verifiably running within a container, why would docker consider a service based on that container to not be running? What is Docker's criteria for considering a container to be running as a service?
The status of starting means that it's waiting for the HEALTHCHECK condition to be satisfied.
Examine your Dockerfile's (or compose file's) HEALTHCHECK conditions and investigate why they are not being satisfied.
NOTE: Do not confuse starting with restarting, which means that the program is being launched again (usually after a crash) due to the restart policy.

Schedule daily Docker container restart / reset

I have a Linux based Docker container running an application which seems to have a memory leak. After around a week requests to the application start to fail and the container requires a restart to reset its state and get things working again.
The error reported by the application is:
java.lang.OutOfMemoryError: Java heap space
Is there a generic method that can be used to trigger a restart, resetting it's state, regardless of which service is being used to host it? If there's not a good generic solution, I'm about to give DigitalOcean a whirl so maybe there's a DigitalOcean specific solution that may work instead?
You can set a restart policy (with flag on-failure) as described here.
Check out the Watchtower project. This is an incredible tool that restarts Docker containers on schedule and also updates containers automatically.

Deploying Elastic search 6 in Azure Container Instance

I'm trying to deploy the current version of Elastic Search in an Azure Container Instance using the Docker image, however, I need to set vm.max_map_count=262144. Although since the container continually tries to restart on max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] I can't hit the instance with any commands. Trying to disable restarts or continuing on Errors causes the container instance to fail.
From the comments it sounds like you may have resolved the issue. In general for future readers a possible troubleshooting guide is:
If container exits unsuccessfully
Try using EXEC for interactive debugging while container is running. This can be found in the Azure portal as well on the "Containers" tab.
Attempt to run to success on local docker if EXEC did not help.
Upload new container version after local success was found to your registry and try to redeploy to ACI.
If container exits successfully and repeatedly restarts
Verify you have a long-running command for the container.
Update the restart policy to Never so upon exit you can debug the terminated container group.
If you cannot find issues, follow the local steps and get a successful run with local Docker.
Hope this helps.

Docker container management solution

We've NodeJS applications running inside docker containers. Sometimes, if any process gets locked down or due to any other issue the app goes down and we've to manually login to each container n restart the application. I was wondering
if there is any sort of control panel that allow us to easily and quickly restart those and see the whole health of the system.
Please Note: we can't use --restart flag because essentially application doesn't exist with exist code. It run into problem like some process gets blocked, things are just getting bogged down vs any crashes and exist codes. That's why I don't think restart policy will help in this scenario.
I suggest you consider using the new HEALTHCHECK directive in Docker 1.12 to define a custom check for your locking condition. This feature can be combined with the new Docker swarm service feature to specify how many copies of your container you want to have running.

How to automatically start services inside a docker container

I am trying to find the best way to automatically start services inside a docker container once it has been restarted.
I don't mean starting the docker container on restart. I'm trying to achieve the following way:
I stop a container; and
when I start it again, the same services (processes) I was running before will start up again.
I.e. if I am running apache and ssh inside the container starting those service on container restart
That's really not the docker way (multiple processes per container). You can try to go down that path, as I did for several months, but you'll find that you'll be going against the docker team's design principles most of the time. I used the phusion/baseimage base image and it really is well designed, with a good init process and support for run-it and ssh out of the box. Tread carefully, if you go down that path however.

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