PioneersIO - Networking with Docker
This document discusses networking with Docker containers using overlay networks. It introduces Adrien Blind and Laurent Grangeau and their experience with DevOps. It then explains the container paradigm of standardizing application packaging and operations. It discusses Docker's properties like isolation, virtualization, and portability. It focuses on the challenges of networking containers spread across multiple hosts, including topology, orchestration, clustering, and multi-tenancy. It introduces overlay networks that create virtual networks on top of the physical network. Finally, it demonstrates Weave as an example overlay network and shows launching Weave, creating database containers on different hosts, and linking application containers to access the databases over the Weave network.
PioneersIO - Networking with Docker
- 1. Networking with Docker Pioneers.Paris Adrien Blind, Laurent Grangeau
- 2. Who are we ? Adrien Blind DevOps coach, Banking Industry @adrienblind adrien@blind-net.fr Laurent Grangeau DevOps coach, Finaxys @laurentgrangeau laurent.grangeau@gmail.com
- 5. The container paradigm « A technology which standardize packaging and facilitates operations of applications »
- 6. IsolationVirtualisation VM VMVM Hypervisor Hardware App. MDW App. MDW App. MDW Kernel Kernel Kernel OS base OS base OS base Kernel Hardware or VM Container App. OS base MDW Container App. OS base MDW Container App. MDW OS base
- 7. PO DI LI SORTABLE SPOSABLE VE CIAL Docker’s observable properties
- 8. Spreading docker on multiple host You will probably not leverage on a single host... Creating a docker hosting capability will generate additionnal challenges Topology Orchestration Networking : clustering, multi-tenancy, etc. Let’s now focus on the networking challenges
- 9. Overlay networks Virtual networks ‘floating’ on top of the base network Host Physical network Host Tenant #1 networkApp server App server App server DB Tenant #2 networkDB App server
- 10. Major competitors OpenVSwitch & pipework… SocketPlane Weave
- 11. Laptop Demo using Weave Virtual host Virtual Host Tenant #1 10.0.100.0/24 App server 10.0.100.2 eth0 DB server 10.0.100.1 Tenant #2 10.0.200.0/24 DB server 10.0.200.1 Appserver 10.0.200.2 #1 Vagrant delivers virtual hosts having Docker Engine installed #3 Containers are popped through weave run command (wrap docker run) #2 Weave launches a special container used as a network router Weave Weave eth0 eth0 Virtual network
- 13. Appendix • Launch Weave – host1:~$ sudo weave launch – host2:~$ sudo weave launch 172.17.8.101 • Create DB containers – host1:~$ sudo weave run 10.0.100.1/24 -itd -e MYSQL_ROOT_PASSWORD=mysecretpassword mariadb – host2:~$ sudo weave run 10.0.200.1/24 -itd -e MYSQL_ROOT_PASSWORD=mysecretpassword mariadb
- 14. Appendix • Link APP containers to DB containers – host1:~$ sudo weave run 10.0.200.2/24 -itd -e WORDPRESS_DB_HOST=10.0.200.1 -e WORDPRESS_DB_PASSWORD=mysecretpassword -p 8080:80 wordpress – host2:~$ sudo weave run 10.0.100.2/24 -itd -e WORDPRESS_DB_HOST=10.0.100.1 -e WORDPRESS_DB_PASSWORD=mysecretpassword -p 8080:80 wordpress