This is base image with s6 overlay (supervisor utils) already setup. Directory structure is also setup.
root # Files copied to image started from root
etc
cont-finish.d # See s6-overlay
cont-init.d # See s6-overlay
fix-attrs.d # See s6-overlay
service.d # See s6-overlay
usr/local/etc/bi # Base image configuration files
vars # Base image container variables
Dockerfile # Image configuration
Image has prepared directories:
/appfor application/configfor configuration/datafor application data/defaultsfor default configuration which is copied to/configif directory is empty/logfor logging (often you need separated directory for logs (because you don't want to write to eg. SD card ...))
| Parameter | Function |
|---|---|
-e CONTAINER_USER="abc" |
Set non-root user used in container (do not modify, already set in Dockerfile) |
-e FAIL_MODE="hard" |
Fail action (blank: service restart, hard: restart container on service fail, count: Try restart service inside n-times before container restart) |
-e FAIL_MODE_SERVICE="service1 service2" |
List of services to setup fail action |
-e FAIL_MODE_SERVICE_IGNORE="service1 service2" |
List of services to ignore when setting up fail action |
-e RUN_ROOT=true |
Disable $RUNCMD |
-e NO_CHOWN=true |
Don't re-chown prepared directories |
-e NO_DEFAULT_CONFIG=true |
Skip setting up default config |
-e PUID=1000 |
for UserID - see below for explanation |
-e PGID=1000 |
for GroupID - see below for explanation |
-e TZ=Europe/London |
Specify a timezone |
-v /config |
All the config files reside here. |
-v /log |
All the log files reside here. |
| Variable name | Function |
|---|---|
CONTAINER_USER |
User used to run in less priviledged mode (owner of prepared directories). |
CONTAINER_VARS_FILE |
File where base image container variables are stored, load it with source $CONTAINER_VARS_FILE at the top of your scripts (* - variables that depend on this) |
DOCKER_CONTAINER |
Always true |
RUNCMD |
Put it before every bash command to make sure command is run as container user (generates sudo -u PID -g GID -E command) * |
When using volumes (-v flags) permissions issues can arise between the host OS and the container, we avoid this issue by allowing you to specify the user PUID and group PGID.
Ensure any volume directories on the host are owned by the same user you specify and any permissions issues will vanish like magic.
In this instance PUID=1000 and PGID=1000, to find yours use id user as below:
$ id username
uid=1000(dockeruser) gid=1000(dockergroup) groups=1000(dockergroup)Note: Default user is in most cases named abc.
For each service in /etc/services.d/*/ you can manually setup fail action using finish script. But you can do this automatically by setting FAIL_MODE, which will dynamically generate finish scripts for all your services specified in /etc/services.d/*/ (custom finish scripts will be left untouched).
Fail modes:
hard- If service fails, container fails
count- Service can fail
FAIL_MODE_COUNTtimes before container fails
- Service can fail
Note: You can select for which services you want to automatically setup failmode with FAIL_MODE_SERVICE="service1 service2".
Note. You can exclude service from automatic setup with FAIL_MODE_SERVICE_IGNORE="service1 service2".
# Build image
sudo docker build -t IMGNAME .
# Run image
sudo docker run --rm -it IMGNAME bashHere are additional variables for Docker Hub build.
| Parameter | Function |
|---|---|
IMAGE,IMAGE_<arch> |
Base image name |
IMAGE_<ref>_ORIG=true |
Preserve original docker tag through build. |
IMAGE_<ref>_SRCTAG=<source tag> |
Image source tag (if it is different from $DOCKER_TAG. |
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