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Docker basics and troubleshooting

guide-by-example

Purpose

For me to wrap head around some shit. Notes for troubleshooting.

What was at one time tested and should 100% work.

docker-compose

docker-compose.yml

services:

  whoami:
    image: "containous/whoami"
    container_name: "whoami"
    hostname: "whoami"
    ports:
      - "80:80"

Scheduling and cron issues

The default docker-compose deployment uses cron container.
Problem is it does not work, so Ofelia is used.
Here is guide how to set it up.

Bellow is Ofelia's config file for discovery and ping check of live hosts.

config.ini

[job-exec "phpipam ping"]
schedule = @every 10m
container = phpipam-web
command = /usr/bin/php /phpipam/functions/scripts/pingCheck.php

[job-exec "phpipam discovery"]
schedule = @every 25m
container = phpipam-web
command = /usr/bin/php /phpipam/functions/scripts/discoveryCheck.php

Reverse proxy

Caddy v2 is used, details here.

Caddyfile

ipam.{$MY_DOMAIN} {
    reverse_proxy phpipam-web:80
}

First run

New phpipam installation
Automatic database installation
MySQL username: root
MySQL password: my_secret_mysql_root_pass

Update

Watchtower updates the image automatically.

Manual image update:

docker-compose pull
docker-compose up -d
docker image prune

Backup and restore

Backup

Using borg that makes daily snapshot of the entire directory.

Restore

down the homer container docker-compose down
delete the entire homer directory
from the backup copy back the homer directory
start the container docker-compose up -d

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