#DOCKER NETWORK TROUBLESHOOTING CODE#

This is most likely caused by a conflict with another extension called Docker Explorer (not authored by Microsoft). Docker containers and images have disappeared from Docker view

#DOCKER NETWORK TROUBLESHOOTING CODE#

Since VS Code runs as a non-root user, you will need to follow the steps in 'Manage Docker as a non-root user' from Post-installation steps for Linux to access Docker from the extension.

The following example shows the required changes in the case of a Python Django app: Error 'connect EACCES /var/run/docker.sock' on Linux You can usually search for any occurrences of the old port number in tasks.json and replace it with the new port number. Next, ensure the docker run task in tasks.json also expects the same port. app # Creates a non-root user and adds permission to access the /app folder RUN adduser -u 5678 -disabled-password -gecos '' appuser & chown -R appuser /app USER appuser CMD

other directives such as installing requirements.txt file # Creates /app in container if it does not already exist # Ports code into /app WORKDIR /app ADD. In the example below, the Gunicorn port had to be updated to match the exposed port: # 1024 or higher EXPOSE 1024 #. Ensure that your exposed port is updated wherever it is referenced. Within the Dockerfile, you must expose a non-system port, create a working directory for your app code, and then add a non-root user with access to the app directory. For some project types, such as Python: General, you might still need to modify your Dockerfile and tasks.json. This command overwrites your current Dockerfile and tasks.json. If your current Dockerfile and tasks.json is not set up for non-root usage, try running the command Add Dockerfiles to Workspace, and select a port greater than 1023. The Add Dockerfiles to Workspace command sets up non-root privileges if you choose a non-system port. This is because ports in this range are called well-known or system ports and must execute with rootВ privileges in order to bind aВ network socketВ to anВ IP address. If you select a port less than 1024 when adding Dockerfiles to the workspace, the Docker extension cannot create a Dockerfile that runs the container as a non-root user. In all cases, you must ensure each resource (such as ports and files) modified or used by your application can be accessed by a non-root user in your container. In some cases, there is no port selection, so the Docker extension configures non-root access by default. This will allow VS Code to configure the Dockerfile with non-root access and prevent a malicious user from elevating permissions in the container. Running as a non-root userДЇor security reasons, we recommend selecting the default ports when executing the Add Dockerfiles to Workspace command, or otherwise opting for a port greater than 1023 whenever possible. See the Overview and quickstart articles for Node.js, Python, or ASP.NET for details on setting up and working with Docker. This article covers troubleshooting tips and tricks for the Visual Studio Code Docker extension.

Configure IntelliSense for cross-compiling.

See: nicolaka/netshoot for further details.Д«onus: If you replace container: with host, you can launch netshoot in the host's network namespace. The network behaves exactly like it would on the container you diagnose, with the difference that you have the swiss army knive of network troubleshooting tools at hand. It hooks into the 'network interface' of another container (actualy it just hooks into the same namespace for the network interface used by the other container).

This container provides an interacive shell with all required tools to troubleshoot network issues. You can diagnose network problems with the netshoot container:Дocker run -it -net container: nicolaka/netshoot Whichever DNS servers are configured on the host, will be used inside the container.Д¬ustom created bridge network on the other hand have a build in DNS Server, used to resolve service/container/service names of containers in the same network. Each container gets the file /etc/nf injected from the host. The default bridge network does not have a DNS server. Containers in privilged mode basicly run with 'the host's root permissions' and are weak isolated compared to a normal container. Portainer couldn't have done something that caused the behavior.ДЄ VPN client on the other hand could have cause the behavior very much, especialy if the container runs in priviliged mode.

2022.03

Docker network troubleshooting