![]() With this, we are done with a basic setup on how docker actually implements linux network stack to isolate containers. This is similar to SNAT, except that it does not require the machine’s IP address to be known in advance.Basically, what we are doing here is that we are adding an entry to NAT table, to masquerade the outgoing traffic from the bridge, except for the bridge traffic itself. MASQUERADE modifies the source address of the packet, replacing it with the address of a specified network interface. Multiple containers on the same host can talk to each other through the Linux bridge. The various interfaces on the containers talk to the bridge, and the bridge proxies to the external world. When Docker service starts, a Linux bridge is created on the host machine. Routing allows multiple networks to communicate independently and yet remain separate, whereas bridging connects two separate networks as if they were a single network.ĭocker has a **docker0 **bridge underneath to direct traffic. *Since forwarding is done at Layer 2, all protocols can go transparently through a bridge. **Packets are forwarded based on Ethernet address*, rather than IP address (like a router). A bridge is a way to connect two Ethernet segments together in a protocol independent way. A network bridge creates a single, aggregate network from multiple communication networks or network segments. Remember that when you have multiple containers running, and want to send traffic to these containers, we’d require a bridge to connect them. Men build too many walls and not enough bridges The host namespaces interfaces do not have an IP assigned ( veth1, veth2). Remember, here we’ve only assigned network addresses to the interfaces inside the network namespaces ( ns1 (vpeer1), ns2 (vpeer2)). Network isolation is what we are interested in, so we will be discussing in depth about network namespaces.Īll the examples in this article have been made on a fresh vagrant Ubuntu Bionic virtual machine.Įnter fullscreen mode Exit fullscreen mode There are currently 7 types of namespaces Cgroup, IPC, Network, Mount, PID, User, UTS Namespaces are like separate houses with their own sets of isolated resources. TLDR, a linux namespace is an abstraction over resources in the operating system. In this series, my aim is to dig deep to understand the various ways in which these container orchestration platforms implement network internals underneath. Linux Networking is a very interesting topic. ![]() These series of articles are my log of learning about various networking concepts related to Container Orchestration Platforms (Docker, Kubernetes, etc)
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