81 lines
2.4 KiB
Bash
81 lines
2.4 KiB
Bash
#!/bin/bash
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# Network troubleshooting script for LXC containers
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# Exit on any error
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set -e
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echo "Starting network troubleshooting..."
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# Check if we can ping IP addresses
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echo "Testing basic connectivity..."
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if ping -c 2 8.8.8.8 >/dev/null 2>&1; then
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echo "✅ Basic network connectivity works (can ping 8.8.8.8)"
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else
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echo "❌ Cannot ping 8.8.8.8 - basic network connectivity issue"
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echo "Checking network interfaces..."
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ip a
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fi
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# Check and fix DNS
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echo "Checking DNS configuration..."
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if ! grep -q "nameserver" /etc/resolv.conf || ! host archive.ubuntu.com >/dev/null 2>&1; then
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echo "❌ DNS resolution not working, fixing..."
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# Add Google DNS servers
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echo "nameserver 8.8.8.8
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nameserver 8.8.4.4" > /etc/resolv.conf
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echo "✅ Added Google DNS servers to /etc/resolv.conf"
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# Make DNS changes persistent
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echo "Making DNS changes persistent..."
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mkdir -p /etc/systemd/resolved.conf.d/
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cat > /etc/systemd/resolved.conf.d/dns_servers.conf << EOF
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[Resolve]
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DNS=8.8.8.8 8.8.4.4
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FallbackDNS=1.1.1.1
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EOF
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# Try to restart systemd-resolved if it exists
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if systemctl status systemd-resolved >/dev/null 2>&1; then
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systemctl restart systemd-resolved
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echo "✅ Restarted systemd-resolved"
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fi
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# Try to restart systemd-networkd if it exists
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if systemctl status systemd-networkd >/dev/null 2>&1; then
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systemctl restart systemd-networkd
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echo "✅ Restarted systemd-networkd"
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fi
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else
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echo "✅ DNS configuration looks good"
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fi
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# Add hosts entries as a fallback
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echo "Adding fallback entries to /etc/hosts..."
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if ! grep -q "archive.ubuntu.com" /etc/hosts; then
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cat >> /etc/hosts << EOF
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185.125.190.36 archive.ubuntu.com
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185.125.190.36 security.ubuntu.com
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EOF
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echo "✅ Added Ubuntu repositories to /etc/hosts"
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fi
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# Test DNS resolution
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echo "Testing DNS resolution..."
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if host archive.ubuntu.com >/dev/null 2>&1; then
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echo "✅ DNS resolution working for archive.ubuntu.com"
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else
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echo "❌ DNS resolution still not working for archive.ubuntu.com"
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echo "Trying ping with hosts file..."
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if ping -c 2 archive.ubuntu.com >/dev/null 2>&1; then
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echo "✅ Can ping archive.ubuntu.com using hosts file entry"
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else
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echo "❌ Still cannot reach archive.ubuntu.com"
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echo "This may be a more serious network issue with your LXC container"
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fi
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fi
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echo "Network troubleshooting completed"
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echo "Try running 'apt update' now to see if it works"
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