# Docker DNS Fix for WSL2

## Problem
Docker is failing to pull images with the error:
```
Error response from daemon: Get "https://registry-1.docker.io/v2/": dial tcp: lookup registry-1.docker.io on 10.0.2.3:53: read udp 10.0.2.100:32836->10.0.2.3:53: i/o timeout
```

This is a DNS resolution issue in WSL2.

## Quick Fix (Try This First)

### Option 1: Quick Script
```bash
./quick-dns-fix.sh
```

### Option 2: Manual DNS Fix
```bash
# Fix WSL2 DNS (requires sudo)
sudo bash -c 'cat > /etc/resolv.conf <<EOF
nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 1.1.1.1
EOF'

# Test DNS
nslookup registry-1.docker.io
```

### Option 3: Docker Desktop Configuration
If using Docker Desktop:
1. Open Docker Desktop
2. Go to **Settings** → **Docker Engine**
3. Add DNS configuration:
```json
{
  "dns": ["8.8.8.8", "8.8.4.4", "1.1.1.1"]
}
```
4. Click **Apply & Restart**

## Full Fix (If Quick Fix Doesn't Work)

Run the comprehensive fix script:
```bash
sudo ./fix-docker-dns.sh
```

This script will:
- Configure WSL2 DNS settings
- Configure Docker daemon DNS
- Restart Docker service
- Test connectivity

## Additional Troubleshooting

### Restart WSL
From Windows PowerShell (as Administrator):
```powershell
wsl --shutdown
```
Then restart your WSL terminal.

### Check Network Connectivity
```bash
# Test basic connectivity
ping 8.8.8.8

# Test DNS resolution
nslookup registry-1.docker.io
host registry-1.docker.io
```

### Check Docker Status
```bash
docker info
docker version
```

### Windows Firewall/Antivirus
- Check if Windows Firewall is blocking Docker
- Temporarily disable antivirus to test
- Add Docker Desktop to firewall exceptions

### Alternative: Use Docker Mirror/Proxy
If you're behind a corporate firewall, you may need to configure a Docker registry mirror or proxy.

## After Fixing

Once DNS is working, try running the Quorum network again:
```bash
cd /home/intlc/projects/quorum-test-network
./run.sh
```

## Prevention

To prevent WSL2 from overwriting `/etc/resolv.conf`:
```bash
sudo bash -c 'cat > /etc/wsl.conf <<EOF
[network]
generateResolvConf = false
EOF'
```

Then manually configure `/etc/resolv.conf` as shown above.