You cannot save a variable for later use in other Dockerfile commands (if that is your intention). This is because each RUN happens in a new shell. However, if you just want to capture the output of ls you should be able to do it in one RUN compound command. For example: RUN file=”$(ls -1 … Read more
I usually test the result of docker images -q (as in this script): if [ -z “$(docker images -q myimage:mytag 2> /dev/null)” ]; then # do something fi On Powershell (comment from Garret Wilson): if (!(docker images -q myimage:mytag 2> $null)) { # do something } But since docker images only takes REPOSITORY as parameter, … Read more
When you use both entrypoint and command, the command section will be appended to entrypoint executable as arguments. Thus in your case: ENTRYPOINT [“/start.sh”] CMD [“aptly”, “api”, “serve”] Is equivalent to running: ENTRYPOINT[“/start.sh”, “aptly”, “api”, “serve”]
Docker compose supports extending compose files, which is very useful for overriding specific parts of your configuration. This is very useful at least for development environments and may be useful in small deployments too. The idea is having a base shared compose file you can override for different teams or environments. You can combine that … Read more
The VOLUME command will specify a mount point in the container. This mount point will be mapped to a location on the host that is either specified when the container is created or (when not specified) chosen automatically from a directory created in /var/lib/docker/volumes. If the directory chosen as the mount point contains any files … Read more
On Linux, cgroups and Docker CPU stats deal in “time slices” of CPU, the number of nanoseconds the CPU has been in use for. To get the percentage, the container cgroup value of “time used” is compared to the overall system value for “time available” from /proc/stat. Due to the stored “time slice” values being … Read more
I believe at this point there is no way to set the UID and GID as a mount option in docker. But there are at least two ways of getting around this: Match UID and GID of the owner/user in the host and container. In your case, if the owner ID and GID on the … Read more
I’m not using remote containers, just local once, so not sure if this applies but for locally running containers, you can go to the “Docker” tab (you need to install the official Microsoft Docker VS Code Plugin) where you can see your running containers. Just right-click on the container you want to see the logs … Read more
So what you need to do in the windows machine port forward the port you are running on the WSL machine, this script port forwards the port 4000 netsh interface portproxy delete v4tov4 listenport=”4000″ # Delete any existing port 4000 forwarding $wslIp=(wsl -d Ubuntu -e sh -c “ip addr show eth0 | grep ‘inet\b’ | … Read more
In my case, I was using docker-compose run without the –service-ports argument, so port mappings were ignored. Example: docker-compose.yml version: “3” services: app-host: image: nginx:1.19.0-alpine working_dir: /app volumes: – ./:/app/ ports: – “80:3000” command docker-compose run –service-ports app-host References: discussion forum docker-compose documentation