CapRover service app snapshot script

snapshot.sh

#!/bin/bash
set -e

# Define the backup base path
backup_base_path="backups"

# Check if the service name argument is provided
if [ $# -ne 1 ]; then
    echo "Usage: $0 <service_name>"
    exit 1
fi

# Extract the service name argument
service_suffix="$1"

# Check if the service exists with the full name
if docker service ls --filter "name=srv-captain--$service_suffix" --quiet | grep -q .; then
    full_service_name="srv-captain--$service_suffix"
else
    # If the service with the full name does not exist, check without the prefix
    if docker service ls --filter "name=$service_suffix" --quiet | grep -q .; then
        full_service_name="$service_suffix"
    else
        echo "Service srv-captain--$service_suffix or $service_suffix not found. Aborting migration."
        exit 1
    fi
fi

# Get the service name without the prefix
service_name="${full_service_name#srv-captain--}"

echo "Service $full_service_name found. Scaling it to 0 replicas and waiting for tasks to complete..."

# Scale the service to 0 replicas
docker service scale "$full_service_name=0"

# Wait for the service to scale down (adjust the sleep duration as needed)
sleep 10

echo "Service $full_service_name has been scaled down to 0 replicas."

# Create a directory for the backup with a timestamp, or ensure it exists
backup_dir="$backup_base_path/$service_name"
mkdir -p "$backup_dir"

# Get the service information using docker inspect
docker service inspect "$full_service_name" > "$backup_dir/$service_name.json"

echo "Service information has been saved in $backup_dir/$service_name.json."

# List the volumes used by the service
volumes=$(docker service inspect --format '{{range .Spec.TaskTemplate.ContainerSpec.Mounts}}{{.Source}} {{end}}' "$full_service_name")

# Loop through the volumes and create tar backups using the specified command
for volume in $volumes; do
    backup_command="docker run -v $volume:/volume --rm loomchild/volume-backup backup > "$backup_dir/$(basename $volume).tar""
    eval "$backup_command"
done

echo "Volume backups have been created in $backup_dir."

# Set the service back to its original number of replicas
original_replicas=$(docker service inspect --format "{{.Spec.Mode.Replicated.Replicas}}" "$full_service_name")
docker service scale "$full_service_name=$original_replicas"

echo "Service $full_service_name has been scaled back to $original_replicas replicas."

# Add your migration steps here