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common-debugging.md

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Known issues and debugging techniques

Docker and the command line

  • Cannot use VM on windows 10 and Docker at the same time
  • Cannot VPN into network and use Docker (nginex crashes) when working remotely
    • This seems to be related to the network drives?
    • If docker is running and then I vpn into the network, the computer detects no network drives
    • After running 'docker-compose down' and restating docker, the network drives appear
  • Cannot execute 'docker exec' command in git bash
  • If you are using DockerToolbox rather than Docker for Windows on Windows, see rm-docker-toolbox-setup

Debugging '...\r'

We have seen issues with how new lines are saved in different environemnts depending on where they were created.

Open '.gitattributes'

Add '<file_pattern> -crlf'

Commit '.gitattributes'

Open file in question in notepad++

Open Find+Replace dialog

Repalce '\r' with ''. Make sure that 'Search Mode' is in 'Extended mode'

i.e.

' /usr/bin/env: ‘python\r’: No such file or directory' in error message

Open '.gitattributes'

Add '*.py -crlf'

Commit, replace in notepad++

There appears to be trouble with your network connection. Retrying...

i.e.

frontend_1 | info There appears to be trouble with your network connection. Retrying...
frontend_1 | info There appears to be trouble with your network connection. Retrying...
frontend_1 | error An unexpected error occurred: "https://registry.yarnpkg.com/ p-is-promise/-/p-is-promise-2.0.0.tgz: Client network socket disconnected before secure TLS connection was established".
frontend_1 | info If you think this is a bug, please open a bug report with the information provided in "/home/node/yarn-error.log".
frontend_1 | info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
frontend_1 | yarn run v1.12.3
frontend_1 | \$ react-scripts start
frontend_1 | /bin/sh: 1: react-scripts: not found
frontend_1 | error Command failed with exit code 127.
frontend_1 | info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
project-thundercat_frontend_1 exited with code 1

Delete yarn.lock file and node_modules and run

docker-compose up

again.

This time it should build. If not, or if this results in changes to your yarn.lock file, simply run

git checkout frontend/yarn.lock

to checkout the old version and then it should work again.

Cannot start service nginx

On Windows 10, sometimes docker shows the following error when starting up

$ docker-compose up
Creating network "project-thundercat_default" with the default driver
Creating project-thundercat_frontend_1 ... done
Creating project-thundercat_db_1       ... done
Creating project-thundercat_backend_1  ... done
Creating project-thundercat_nginx_1    ... error

ERROR: for project-thundercat_nginx_1  Cannot start service nginx: OCI runtime create failed: container_linux.go:344: starting container process caused "process_linux.go:424: container init caused \"rootfs_linux.go:58: mounting \\\"/host_mnt/c/_DEV/git/project-thundercat/nginx/nginx-proxy.conf\\\" to rootfs \\\"/var/lib/docker/overlay2/393d58faaa3c6a244293fcff1a14b5bb93f9d2aec735e29346454824d30556c3/merged\\\" at \\\"/var/lib/docker/overlay2/393d58faaa3c6a244293fcff1a14b5bb93f9d2aec735e29346454824d30556c3/merged/etc/nginx/conf.d/default.conf\\\" caused \\\"not a directory\\\"\"": unknown: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type

ERROR: for nginx  Cannot start service nginx: OCI runtime create failed: container_linux.go:344: starting container process caused "process_linux.go:424: container init caused \"rootfs_linux.go:58: mounting \\\"/host_mnt/c/_DEV/git/project-thundercat/nginx/nginx-proxy.conf\\\" to rootfs \\\"/var/lib/docker/overlay2/393d58faaa3c6a244293fcff1a14b5bb93f9d2aec735e29346454824d30556c3/merged\\\" at \\\"/var/lib/docker/overlay2/393d58faaa3c6a244293fcff1a14b5bb93f9d2aec735e29346454824d30556c3/merged/etc/nginx/conf.d/default.conf\\\" caused \\\"not a directory\\\"\"": unknown: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type
Encountered errors while bringing up the project.

To solve this, do the following steps

Ensure the application is not running

docker-compose down

Run PowerShell as admin.

Run

Set-NetConnectionProfile -interfacealias "vEthernet (DockerNAT)" -NetworkCategory Private

Close powershell

Restart docker (right-click on the docker icon -> restart)

After the restart, run

docker-compose up

And everything should be working again