Services/Docker: Difference between revisions

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= Problems on Windows =
= Dockerfile Debugging =


== Manipulating directory of container in GitBash (MSYS2) ==
{| class="wikitable"
! TODO || Command
|-
| Verify environment variable<br>(stdout won't be printed) ||
<syntaxhighlight lang="docker">
RUN export NVM_DIR="$HOME/.nvm"
RUN echo "NVM_DIR=$NVM_DIR" >&2
</syntaxhighlight>
|-
|  ||
<syntaxhighlight lang="docker">
docker compose build --progress=plain
</syntaxhighlight>


<source lang="bash">
|-
$ docker exec hix-local-server_db_1 ls /
|  ||
# or with single quotes
<syntaxhighlight lang="docker">
$ docker exec hix-local-server_db_1 ls '/'
docker compose build --no-cache --progress=plain
# or with double quotes
</syntaxhighlight>
$ docker exec hix-local-server_db_1 ls "/"
|}
ls: cannot access 'C:/Program Files/Git/': No such file or directory
</source>
 
The best alternative way to solve this problem is WSL integration.
 
Require two steps.
 
* Install Windows embedded Ubuntu 20.04.
* Change settings of Docker Desktop.
 
[[image:wsl-docker.jpg]]
 
== Using volume in GitBash (MSYS2) ==
 
=== Valid host directory ===
 
<pre>
winpty docker run --name sandbox0 -v "C:\Users\Raymond\repos\twnews":/vol -it alpine:3.11
winpty docker run --name sandbox0 -v 'C:\Users\Raymond\repos\twnews':/vol -it alpine:3.11
winpty docker run --name sandbox0 -v C:\\Users\\Raymond\\repos\\twnews:/vol -it alpine:3.11
</pre>
 
=== Unexpected error ===
 
<pre>
$ winpty docker run --name sandbox0 -v C:\Users\Raymond\repos\twnews:/vol -it alpine:3.11
docker: Error response from daemon: The system cannot find the file specified.
See 'docker run --help'.
 
$ winpty docker run --name sandbox0 -v C:/Users/Raymond/repos/twnews:/vol -it alpine:3.11
docker: Error response from daemon: invalid mode: \Program Files\Git\vol.
See 'docker run --help'.
 
$ winpty docker run --name sandbox0 -v ~:/vol -it alpine:3.11
docker: Error response from daemon: mkdir C:\Users\Raymond;C: Access is denied.
See 'docker run --help'.
</pre>
 
=== Bad guest path ===
 
<pre>
$ winpty docker run --name sandbox0 -v /C/Users/Raymond/repos/twnews:/vol -it alpine:3.11
or
$ winpty docker run --name sandbox0 -v "/C/Users/Raymond/repos/twnews":/vol -it alpine:3.11
 
/ # ls -l
total 56
drwxrwxrwx    1 root    root            0 Sep 30 07:29 \Program Files\Git\vol
drwxr-xr-x    2 root    root          4096 Apr 23 06:25 bin
drwxr-xr-x    5 root    root          360 Sep 30 08:46 dev
drwxr-xr-x    1 root    root          4096 Sep 30 08:46 etc
drwxr-xr-x    2 root    root          4096 Apr 23 06:25 home
drwxr-xr-x    5 root    root          4096 Apr 23 06:25 lib
drwxr-xr-x    5 root    root          4096 Apr 23 06:25 media
drwxr-xr-x    2 root    root          4096 Apr 23 06:25 mnt
drwxr-xr-x    2 root    root          4096 Apr 23 06:25 opt
dr-xr-xr-x  154 root    root            0 Sep 30 08:46 proc
drwx------    1 root    root          4096 Sep 30 08:46 root
drwxr-xr-x    2 root    root          4096 Apr 23 06:25 run
drwxr-xr-x    2 root    root          4096 Apr 23 06:25 sbin
drwxr-xr-x    2 root    root          4096 Apr 23 06:25 srv
dr-xr-xr-x  12 root    root            0 Sep 30 08:46 sys
drwxrwxrwt    2 root    root          4096 Apr 23 06:25 tmp
drwxr-xr-x    7 root    root          4096 Apr 23 06:25 usr
drwxr-xr-x  12 root    root          4096 Apr 23 06:25 var
</pre>

Latest revision as of 09:39, 26 September 2025

Clean Docker

TODO Command
Run debian image on Windows 
# Git Bash
winpty docker run --name=debian0 -it debian:12

# Power Shell
docker run --name=debian0 -it debian:12
Open shell of running container 
docker exec -it mwdev-mediawiki-1 /bin/bash
Copy file from running container 
docker cp mwdev-mediawiki-1:/var/www/data/my_wiki.sqlite .
Build image 
docker build .
docker build -t gdtile:2.1 .
docker tag c8abdb693116 gdtile:2.1
Remove exited containers 
docker rm $(docker ps -f 'status=exited' -q)

sudo docker rm $(sudo docker ps -f 'status=exited' -q)
Remove unused images 
docker rmi $(docker images -f "dangling=true" -q)

sudo docker rmi $(sudo docker images -f "dangling=true" -q)
run and start it again 
docker run --name sandbox0 \
  --volume a:b \
  -it alpine:3.11
docker start -i sandbox0
Make apt faster 
FROM ubuntu:20.04

RUN sed -i 's/\(archive\|security\).ubuntu.com/free.nchc.org.tw/' /etc/apt/sources.list
RUN apt update

# In host
docker run -it ubuntu:20.04
# In container
sed -i 's/\(archive\|security\).ubuntu.com/free.nchc.org.tw/' /etc/apt/sources.list
apt update
Run 
# Mapping directory on Windows, do not use ~
docker run -v C:\Users\User\repos\something:/docroot -it someimage bash
docker run -v %USERPROFILE%\repos\webserv:/docroot -it webserv-compose_web bash
test 
docker ps --size --all
logs 
docker ps logs -ft container

Dockerfile Debugging

TODO Command
Verify environment variable
(stdout won't be printed)		 
RUN export NVM_DIR="$HOME/.nvm"
RUN echo "NVM_DIR=$NVM_DIR" >&2

docker compose build --progress=plain

docker compose build --no-cache --progress=plain
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