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[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target docker.socket firewalld.service containerd.service time-set.target
Wants=network-online.target containerd.service
Requires=docker.socket

[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still

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.RECIPEPREFIX = >
.PHONY: all
CFLAGS = -pedantic -Wall -Werror -Wstrict-prototypes -Wwrite-strings -Wshadow -Winit-self -Wcast-align -Wformat=2 -Wmissing-prototypes -Wstrict-overflow=2 -Wcast-qual -Wc++-compat -Wundef -Wswitch-default -Wconversion
%.o : %.c
> $(CC) -c $(CFLAGS) -o $@ $<

all: helloworld

helloworld: helloworld.c
> $(CC) $(CFLAGS) -o $@ $<

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#!/bin/bash

# getdockerenv.sh v1.0
# 2021-06-23 - João Alves

# This script sets a group of variables that can be useful in a containerized environment
# It is specially tuned for docker but might (not tested) work in other environments

# Exported variables:
# CGROUPS - v1, v2, none

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Ansible instructions to merge two json files.

Assumes files: original.json, merge.json and new.json

---
- name: get content of original file
  slurp:
    src: "original.json"
 register: original_config

jpralves

Docker TWINs without docker

This is a new example on how to use docker along docker without docker, confused?, I'm using the docker API to create and run containers.

In this particular example the image self-replicates itself running multiple images.

To build:

docker build . --tag twin-api:latest

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batch notify to desktop from scripts

To be able to send notifications to the logged in user you must add the file session-local.conf to folder /etc/dbus-1/session.d Then you can use the command in notify-command.sh to display a message. Don't forget to match the UID with the one currently running the session.

This was tested in Fedora 31/32.

jpralves

Docker TWINs

This is a simple example on how to use docker along docker.

In this particular example the image self-replicates itself running multiple images.

To build:

docker build . --tag twin:latest

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from Crypto.Hash import MD5
from Crypto.Cipher import DES
import base64
import random
import sys


def randomBytes(n):
    return bytearray(random.getrandbits(8) for i in range(n))

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for s in $(docker service ls --format "{{.Name}}"); do echo $s; docker service inspect $s --format '{{range .Spec.TaskTemplate.ContainerSpec.Secrets}}{{println "    " .SecretName}}{{end}}'; done

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FROM centos:7 AS BUILD

ARG COMPILEFOLDER=/tmp/build
ARG INSTALLBASESSHD=/opt/.ssh
ARG INSTALLBASESSSL=/opt/.ssl

RUN yum -y -q install gcc make perl glibc-static wget

RUN mkdir -p "$COMPILEFOLDER/root"