Since all Linux distributions run the same (yup, it’s a bit simplified) Linux kernel and differ only in userland software, it’s pretty easy to simulate a different distribution environment – by just installing that userland software and pretending it’s another distribution. Being specific, installing CentOS container inside Ubuntu OS will mean that you will get … Read more
You can use Docker Desktop for Windows as the engine and Docker for Linux as the client in WSL on Ubuntu / Debian on Windows. Connect them via TCP. Install Docker Desktop for Windows: https://hub.docker.com/editions/community/docker-ce-desktop-windows If you want to use Windows Containers instead of Linux Containers both type containers can be managed by the Linux … Read more
A Docker image bundles application and “platform”, that’s correct. But usually the image is composed of a base image and the actual application. So the canonical way to handle security updates is to update the base image, then rebuild your application image.
Docker events command may help and Docker logs command can fetch logs even after the image failed to start. First start docker events in the background to see whats going on. docker events& Then run your failing docker run … command. Then you should see something like the following on screen: 2015-12-22T15:13:05.503402713+02:00 xxxxxxxacd8ca86df9eac5fd5466884c0b42a06293ccff0b5101b5987f5da07d: (from xxx/xxx:latest) … Read more
One line only: RUN DEBIAN_FRONTEND=noninteractive TZ=Etc/UTC apt-get -y install tzdata
You could just enter via docker run -it –entrypoint=/bin/bash $IMAGE -i (you ‘ll launch a new container from the image and get a bash shell in interactive mode), then run the entrypoint command in that container. You can then inspect the running container in the state it should be running. EDIT: Since Docker 1.3 you … Read more
The secret here is that dpkg-reconfigure tzdata simply creates /etc/localtime as a copy, hardlink or symlink (a symlink is preferred) to a file in /usr/share/zoneinfo. So it is possible to do this entirely from your Dockerfile. Consider: ENV TZ=America/Los_Angeles RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone And as a bonus, TZ will … Read more
If your image is tagged with more than one tag, then docker rmi will remove the tag, but not the image. So in your example … # docker rmi my-imaj … will remove that tag and leave the image present with the other correct tag.
From the official Nginx docker file: Using environment variables in nginx configuration: Out-of-the-box, Nginx doesn’t support using environment variables inside most configuration blocks. But envsubst may be used as a workaround if you need to generate your nginx configuration dynamically before nginx starts. Here is an example using docker-compose.yml: image: nginx volumes: – ./mysite.template:/etc/nginx/conf.d/mysite.template ports: … Read more
My question is, is it a good idea to use docker for a big woocommerce website (more than 100k products)? Or will this incur a noticable performance cost compared to running wordpress straight on the VPS (without containerization)? It won’t make much difference, nothing you will notice. It’s not even in the top 50 things … Read more