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9. Routingmesh service communication between clusters
2020-11-07 16:43:00 【Taizhu-yj】
establish overlay gateway
docker network create -d overlay demo
docker network ls
NETWORK ID NAME DRIVER SCOPE
7a511becede2 bridge bridge local
im7c34k0bfxh demo overlay swarm
37856c9de79d docker_gwbridge bridge local
c438996bf1e8 host host local
idnr3c47eum5 ingress overlay swarm
a785589db128 lb-scale_default bridge local
14865f2115c6 none null local
e9bba04074f1 wordpress_my-bridge bridge local
establish Service Use network by overlay
As shown in the figure above , We have three applications , Two service One client. They may be deployed in the same worker node On , It may also be deployed separately . The three applications in the picture above , At the same time, it is deployed in 127.0.0.11 On this node .client Want to visit service application , Can pass ip+ The form of the port number , It can also be accessed by application name . How to do it ?docker engine There's one in it DNS service , It sorts out the names of all the applications with IP Address mapping , however Docker DNS Generated and stored in the service IP Address , Not the container where the application is located IP Address , Applications are deployed in 127.0.0.11 nodes , But we see that DNS Stored in ip The address is 10.0.3/4/5, This is virtual IP,VIP. Because the container address of the deployed application changes due to downtime or capacity expansion ,DNS Assign an application a virtual IP, This virtual IP It won't change . So the application is virtual IP Visit each other , Re pass LVS To achieve the .
nslookup www.baidu.com/service name
You can check the domain name corresponding to ip Address , If the domain name is deployed in a cluster , It 's load balanced , It will also show multiple ip Address .
1. When we deploy applications in containers , You need to specify network,network Must be overlay Network protocol , It looks like swarm Of DNS Will use vip To communicate with each other .
2. If the deployed application is bound to an interface , Even if it's deployed on a node , You can also visit swarm This port number of other nodes in the , To access the app .
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11.Service更新