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Volume mounts not working Kubernetes and WSL 2 and Docker

According to the following thread, hostPath volumes are not officially supported for wsl2, yet. They do suggest a workaround, though I had trouble getting it to work. I have found that prepending /run/desktop/mnt/host/c seems to work for me. // C:\someDir\volumeDir hostPath: path: /run/desktop/mnt/host/c/someDir/volumeDir type: DirectoryOrCreate Thread Source: https://github.com/docker/for-win/issues/5325 Suggested workaround from thread: https://github.com/docker/for-win/issues/5325#issuecomment-567594291

Docker loading kernel modules

In Linux host: Run the container in privileged mode (–privileged) Add all capabilities (–cap-add=ALL) mount host /lib/modules into the container (-v /lib/modules:/lib/modules) docker run –name container_name \ –privileged \ –cap-add=ALL -d \ -v /dev:/dev \ -v /lib/modules:/lib/modules \ image_id Caution: Here all Linux capabilities are added so capabilities can be refined. Few words about Linux … Read more

docker-compose up and user inputs on stdin

docker compose up and user inputs on stdin That is expected behaviour. up is not interactive. It can start multiple containers, so you can’t have a single terminal that has stdin open for multiple containers. But there is option to you can do with docker-compose. Attach in different window, when you start with docker-compose up, … Read more

How to source a script with environment variables in a docker build process?

Each Dockerfile RUN step runs a new container and a new shell. If you try to set an environment variable in one shell, it will not be visible later on. For example, you might experiment with this Dockerfile: FROM busybox ENV FOO=foo1 RUN export FOO=foo2 RUN export BAR=bar CMD echo FOO is $FOO, BAR is … Read more

What is meant by shared kernel in Docker?

when we pull ubuntu image then it have different kernel No it does not: it does not have the kernel part: it relies on the kernel of the host (the one running docker engine) for all system calls. As mentioned in “Docker vs Virtualization“: Initially Docker was built as an abstraction layer on top of … Read more

Connect to another container using Docker compose

Use the alias “db” that you have defined in file to refer to the database host name. Containers for the linked service will be reachable at a hostname identical to the alias, or the service name if no alias was specified. Source: https://docs.docker.com/compose/compose-file/compose-file-v2/#links

boot2docker startup script to mount local shared folder with host

/var/lib/boot2docker/bootlocal.sh fits your need probably, it will be run by initial script /opt/bootscripts.sh And bootscripts.sh will also put the output into the /var/log/bootlocal.log, see segment below (boot2docker 1.3.1 version) # Allow local HD customisation if [ -e /var/lib/boot2docker/bootlocal.sh ]; then /var/lib/boot2docker/bootlocal.sh > /var/log/bootlocal.log 2>&1 & fi One use case for me is I usually put … Read more

Substitute environment variables in NGINX config from docker-compose

Since nginx 1.19 you can now use environment variables in your configuration with docker-compose. I used the following setup: # file: docker/nginx/templates/default.conf.conf upstream api-upstream { server ${API_HOST}; } # file: docker-compose.yml services: nginx: image: nginx:1.19-alpine volumes: – “./docker/nginx/templates:/etc/nginx/templates/” environment: NGINX_ENVSUBST_TEMPLATE_SUFFIX: “.conf” API_HOST: api.example.com I’m going off script a little from the example in the documentation. … Read more

Can I specify host directory to mount from Dockerfile

Dockerfiles are meant to be portable and shared. The host-dir volume is something 100% host dependent and will break on any other machine, which is a little bit off the Docker idea. Because of this, it is only possible to use portable instructions within a Dockerfile. If you need a host-dir volume, you need to … Read more

Docker add network drive as volume on windows

My colleague came up with this and it works with our company network drive and it might help someone out there. We start by creating a docker volume named mydockervolume. docker volume create –driver local –opt type=cifs –opt device=//networkdrive-ip/Folder –opt o=user=yourusername,domain=yourdomain,password=yourpassword mydockervolume –driver specifies the volume driver name –opt Sets driver specific options. I guess … Read more