66 lines
1.7 KiB
Bash
66 lines
1.7 KiB
Bash
#!/bin/bash
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set -euo pipefail
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# -------------------------------
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# Prompt user for subnet base
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# -------------------------------
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read -rp "Enter the second octet for your Docker network (e.g., 100 for 10.100.0.0/16): " octet
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# Validate that it's a number between 1 and 254
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if ! [[ "$octet" =~ ^[0-9]{1,3}$ ]] || ((octet < 1 || octet > 254)); then
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echo "Invalid input. Must be a number between 1 and 254."
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exit 1
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fi
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# -------------------------------
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# Define values
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# -------------------------------
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DOCKER_DAEMON_FILE="/etc/docker/daemon.json"
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ADDRESS_POOL_BASE="10.${octet}.0.0/16"
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ADDRESS_POOL_SIZE=24
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# NETWORK_NAME="bridge_default"
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NETWORK_SUBNET="10.${octet}.1.0/24"
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# -------------------------------
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# Replace daemon.json
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# -------------------------------
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echo "Writing Docker daemon.json with base $ADDRESS_POOL_BASE..."
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sudo mkdir -p /etc/docker
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cat <<EOF | sudo tee "$DOCKER_DAEMON_FILE" > /dev/null
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{
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"default-address-pools": [
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{
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"base": "10.${octet}.0.0/16",
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"size": 24
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}
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]
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}
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EOF
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echo "Docker config updated at $DOCKER_DAEMON_FILE"
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# -------------------------------
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# Delete and recreate network
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# -------------------------------
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# if docker network inspect "$NETWORK_NAME" >/dev/null 2>&1; then
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# echo "Network '$NETWORK_NAME' exists. Deleting it..."
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# docker network rm "$NETWORK_NAME"
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# fi
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# echo "Creating network '$NETWORK_NAME' with subnet $NETWORK_SUBNET..."
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# docker network create \
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# --driver=bridge \
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# --subnet="$NETWORK_SUBNET" \
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# "$NETWORK_NAME"
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# echo "✅ Done. You may need to restart Docker to apply default address pool changes:"
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echo " sudo systemctl restart docker"
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