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Troubleshooting Docker and Kubernetes Containers

Resolving DNS Issues

Understand how DNS works within Docker environments, including DNS resolution, network configuration, and service discovery. Learn to identify common DNS issues, simulate errors, and apply fixes by modifying DNS settings or container configuration to restore network connectivity.

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DNS (Domain Name System) is a fundamental network protocol. It enables applications and services to communicate with each other using human-readable domain names rather than relying on IP addresses.

An illustration of how DNS works
An illustration of how DNS works

In Docker, DNS plays a crucial role in enabling containerized applications to resolve domain names and establish network connectivity. Docker containers rely on DNS to perform various tasks, including:

  • DNS resolution: Docker containers use DNS to resolve domain names into IP addresses. When a container needs to communicate with another container or an external service, it uses DNS resolution to determine the IP address associated with the target domain name.

  • Network configuration: DNS is used to configure network settings within Docker. It allows containers to receive DNS server information and search ...