关于 docker swarm mode 的基本架构
How does it work? Docker! Part 1: Swarm general architecture
关于 Overlay Network
Demystifying Docker overlay networking
How does it work? Docker! Part 2: Swarm networking
关于服务发现与负载均衡与（Service Discovery and Load Balancing）
How does it work? Docker! Part 3: Load balancing, service discovery and security!
关于 Rolling Updates
Rolling updates with Docker Swarm
1) Pull the image specified in the
docker service updatecommand2) Remove the current (now old) container from its internal load balancer
3) Send a
SIGTERMsignal to the container and give it a grace period of 10 seconds to exit gracefully. If after 10 seconds the service hasn’t yet given up, Docker will terminate the process with aSIGKILLsignal. Both the signal and the grace period can be tweaked with the--stop-signaland the--stop-grace-periodflags when creating/updating the service3) Start the new container
4) Add the new container to its internal load balancer