Temporary failure in name resolution [Errno -3] with Docker

Temporary failure in name resolution [Errno -3] with Docker

The error message "Temporary failure in name resolution [Errno -3]" in the context of Docker indicates a DNS resolution issue. Docker containers rely on DNS (Domain Name System) to resolve hostnames to IP addresses, which allows them to communicate with other containers, services, and external resources.

This error can occur due to various reasons:

  1. DNS Configuration Issues: Check your system's DNS configuration. Ensure that you have valid DNS server addresses configured in your network settings. You can also try switching to different DNS servers such as Google's Public DNS (8.8.8.8 and 8.8.4.4).

  2. Network Connectivity: Make sure your system has an active internet connection. The containers rely on the host's network connectivity to perform DNS resolution.

  3. Firewall or Proxy Settings: Firewall rules or proxy settings could be blocking DNS requests from your Docker containers. Ensure that the necessary ports are open and that your proxy configuration is correct.

  4. Network Overload or Outage: Temporary network overload or outages can also cause DNS resolution failures. If this is the case, the issue might resolve itself when the network stabilizes.

  5. IPv6 Issues: Some systems have issues with IPv6 resolution. You can try disabling IPv6 in Docker if it's causing problems:

    Edit or create the Docker configuration file (usually located at /etc/docker/daemon.json), and add the following:

    {
    "ipv6": false
}

    Restart Docker after making changes.

  6. Docker Daemon Restart: Restart the Docker daemon to refresh its networking components:

    sudo systemctl restart docker

  7. Check /etc/hosts File: Sometimes, incorrect entries in the /etc/hosts file can cause DNS resolution issues. Ensure that the file does not contain conflicting or incorrect entries.

  8. DNS Cache: Docker might have cached DNS entries. Clear Docker's DNS cache:

    sudo systemctl stop docker
sudo rm /var/lib/docker/network/files/local-kv.db
sudo systemctl start docker

Remember that solving DNS issues might involve a combination of these steps, and you should tailor the troubleshooting based on your specific environment and configuration.

Examples

  1. "Docker container DNS resolution issue fix" Description: This query is about troubleshooting and resolving the "Temporary failure in name resolution [Errno -3]" error encountered when using Docker containers, typically caused by DNS resolution issues.

    # Example Dockerfile
FROM ubuntu:latest

# Update package lists
RUN apt-get update

# Install necessary packages for DNS troubleshooting
RUN apt-get install -y dnsutils

  2. "Docker container DNS configuration options" Description: This query aims to explore the various configuration options available within Docker to manage DNS settings and resolve the "Temporary failure in name resolution [Errno -3]" error.

    # Example Docker Compose configuration
version: '3'

services:
  web:
    image: nginx
    networks:
      my_network:
        ipv4_address: 172.28.0.3

networks:
  my_network:
    driver: bridge
    ipam:
      config:
        - subnet: 172.28.0.0/16

  3. "Docker container DNS server troubleshooting" Description: This query is focused on troubleshooting DNS server configurations within Docker containers to address the "Temporary failure in name resolution [Errno -3]" issue.

    # Example command to inspect Docker container DNS settings
docker inspect <container_id> | grep -i dns

  4. "Docker container cannot resolve hostnames" Description: This query explores solutions to Docker containers being unable to resolve hostnames, leading to the "Temporary failure in name resolution [Errno -3]" error.

    # Example command to restart Docker service
sudo systemctl restart docker

  5. "Docker container DNS cache flush" Description: This query involves flushing DNS caches within Docker containers to potentially resolve the "Temporary failure in name resolution [Errno -3]" error.

    # Example command to flush DNS cache inside a Docker container
docker exec <container_id> /etc/init.d/dns-clean start

  6. "Docker container custom DNS configuration" Description: This query is about configuring custom DNS settings within Docker containers to mitigate DNS resolution issues like "Temporary failure in name resolution [Errno -3]".

    # Example Dockerfile snippet
FROM ubuntu:latest

# Use custom DNS server
RUN echo "nameserver 8.8.8.8" > /etc/resolv.conf

  7. "Docker container network configuration DNS" Description: This query delves into Docker container network configurations, focusing on DNS settings to troubleshoot the "Temporary failure in name resolution [Errno -3]" error.

    # Example Docker Compose network configuration
version: '3'

services:
  app:
    image: myapp
    networks:
      my_network:
        ipv4_address: 172.28.0.4

networks:
  my_network:
    driver: bridge
    driver_opts:
      com.docker.network.bridge.enable_ip_masquerade: "true"
      com.docker.network.bridge.name: "docker0"
    ipam:
      config:
        - subnet: 172.28.0.0/16
          gateway: 172.28.0.1
          ip_range: 172.28.5.0/24
          aux_addresses:
            router: 172.28.0.1

  8. "Docker container DNS resolver configuration" Description: This query involves configuring DNS resolver settings within Docker containers to address DNS resolution issues and resolve the "Temporary failure in name resolution [Errno -3]" error.

    # Example Dockerfile snippet
FROM ubuntu:latest

# Set DNS resolver
RUN echo "nameserver 8.8.8.8" > /etc/resolv.conf

  9. "Docker container DNS lookup troubleshooting" Description: This query focuses on troubleshooting DNS lookup issues within Docker containers, which may lead to the "Temporary failure in name resolution [Errno -3]" error.

    # Example command to perform DNS lookup inside a Docker container
docker exec <container_id> nslookup <hostname>

  10. "Docker container hostname resolution fix" Description: This query seeks solutions to fix hostname resolution problems within Docker containers, which can cause the "Temporary failure in name resolution [Errno -3]" error.

    # Example command to edit Docker daemon configuration
sudo nano /etc/docker/daemon.json

    {
  "dns": ["8.8.8.8", "8.8.4.4"]
}

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