All things docker

Here's a with self-reminders and shortcuts for docker management that I'm trying to optimize. Forking / optimization by others is very welcome.

Helper Scripts

Run command in Container (Interactive)

Key features:

1. Validates Docker Compose file existence and handles both .yml/.yaml extensions
2. Uses docker-compose exec for better service handling
3. Shows numbered list of services from compose file
4. Allows complex commands with spaces/special characters
5. Handles command quoting through sh -c
6. Loops until user chooses to exit
7. Works with relative paths and different compose file names

Usage example:

1. Save as docker-shell.sh
2. Make executable: chmod +x docker-shell.sh
3. Run: ./docker-shell.sh
4. Follow prompts to select service and command

The script uses docker-compose exec which automatically handles container names based on the service definition, making it more reliable than working with raw container names. Commands are executed through sh -c to properly handle complex commands with spaces and special characters.

#!/bin/bash

find_compose_file() {
    local input_path="$1"
    if [ -d "$input_path" ]; then
        compose_file=$(find "$input_path" -maxdepth 1 \( -name "docker-compose.yml" -o -name "docker-compose.yaml" \) -type f | head -n 1)
        [ -z "$compose_file" ] && return 1
    elif [ -f "$input_path" ]; then
        compose_file="$input_path"
    else
        return 1
    fi
    echo "$compose_file"
}

default_path="./"
while true; do
    read -e -p "Enter directory/location of docker-compose.y*ml [default: $default_path]: " input_path
    input_path=${input_path:-$default_path}
    compose_file=$(find_compose_file "$input_path")
    
    if [ $? -eq 0 ]; then
        compose_file=$(realpath "$compose_file")
        compose_dir=$(dirname "$compose_file")
        break
    else
        echo "Error: No valid docker-compose file found in '$input_path'" >&2
    fi
done

services=($(docker-compose -f "$compose_file" config --services 2>/dev/null))
if [ $? -ne 0 ] || [ ${#services[@]} -eq 0 ]; then
    echo "Error: Failed to get services from compose file" >&2
    exit 1
fi

while true; do
    echo -e "\nAvailable services:"
    for i in "${!services[@]}"; do
        echo "$((i+1)). ${services[i]}"
    done

    while true; do
        read -p "Select service (1-${#services[@]}): " service_num
        if [[ "$service_num" =~ ^[0-9]+$ ]] && [ "$service_num" -ge 1 ] && [ "$service_num" -le ${#services[@]} ]; then
            selected_service="${services[$((service_num-1))]}"
            break
        fi
        echo "Invalid input. Please enter a number between 1 and ${#services[@]}." >&2
    done

    read -e -p "Enter command to execute (default: bash): " command_input
    command_input="${command_input:-bash}"

    echo -e "\nExecuting: docker-compose exec '$selected_service' sh -c \"$command_input\"\n"
    docker-compose -f "$compose_file" exec "$selected_service" sh -c "$command_input"

    read -p "Do you want to start another shell? [Y/n]: " restart
    [[ "$restart" =~ ^[Nn]$ ]] && break
done

echo "Exiting container shell script."

Reset docker containers, networks, volumes (but leave images)

With loop:

#!/bin/bash

# Stop and remove all containers (incl. running and volumes (-v))
docker ps -aq | xargs -r docker rm -vf

#Remove orphaned resources (volumes, networks, build cache) via loop
for resource in volume network system; do
  if [ "$resource" = "system" ]; then
    docker "$resource" prune -f  # System-Prune ohne --all (Keep images!)
  else
    docker "$resource" prune -f
  fi
done

or

#!/bin/bash

docker ps -aq | xargs -r docker rm -vf

# Only volume/network prune in Loop
for resource in volume network; do
  docker "$resource" prune -f
done

# separate system prune (Keep images)
docker system prune -f

With xargs:

#!/bin/bash

# Stop and remove all containers (incl. running and volumes (-v))
docker ps -aq | xargs -r docker rm -vf

# Remove orphaned volumes
docker volume prune -f

# Remove orphaned networks
docker network prune -f

# Delete build cache, keep images
docker system prune -f

Total docker (container) reset

#!/bin/bash

# Stoppe und entferne alle Container (auch laufende) mit zugehörigen Volumes
docker ps -aq | xargs -r docker rm -vf

# Lösche alle unbenutzten Volumes (z. B. von früheren Containern)
docker volume prune -f

# Optional: Lösche ungenutzte Netzwerke, Images und Build-Cache
docker system prune -af --volumes

Security

Docker Secrets

https://docs.docker.com/compose/how-tos/use-secrets/ #Shortcuts

Variables

.env

Port Mappings

Can port mappings be conslidated and externalized by means of variables in order to keep track in case of a multitude of containers and mappings?