How to deploy Docker Swarm
This article mainly introduces how to deploy Docker Swarm, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.
Software Information Software version OSUbuntu 16.04.3 LTSDocker18.03.0-ce Host Information ubuntu16.04-1172.31.68.241swarm managerubuntu16.04-2172.31.68.242swarm nodeubuntu16.04-3172.31.68.243swarm nodeswarm initialization managerdocker swarm init-- advertise-addr 172.31.68.241
Initialize workerdocker swarm join-- token SWMTKN-1-1mn8x6itne5ldwad5bmtgtdkemoim3o53dc7u2b5y5zj1lwj4l-etyttp60hpns5i4jifym7y3hd 172.31.68.241pur2377
Ps: be careful to execute on both worker
View node status docker node ls
Disable the worker function of manager docker node update-- availability drain ubuntu16.04-1
Ps: so you don't assign execution tasks on manager.
Add labeldocker node update-- label-add app ubuntu16.04-2docker node update-- label-add app ubuntu16.04-3 to worker to view the details of a node docker node inspect ubuntu16.04-3
Ps: to view a specific piece of information, you can use the following command mode
Docker node inspect ubuntu16.04-3-- format "{{.Status.Addr}}" create service create service, one copy docker service create-- replicas 1-p 4000 service 80-- name hello 172.31.68.241/library/friendlyhello
View servicedocker service lsdocker service ps hello
Ps: through service ps, you can see that the real task runs on ubuntu16.04-2, and the name of the container is hello.1.
View other node tasks docker container ls
Ps: you can see that on ubuntu16.04-2, the real name of the container is: service name + task id+ a string of random codes. There is no relevant task running on ubuntu16.04-3 because replicas is 1
View service details docker service inspect hello [{"ID": "woxqqkoqr6viu8flojtuuht97", "Version": {"Index": 25}, "CreatedAt": "2018-08-17T07:20:13.503484813Z", "UpdatedAt": "2018-08-17T07:20:13.515429684Z", "Spec": {"Name": "hello" "Labels": {}, "TaskTemplate": {"ContainerSpec": {"Image": "172.31.68.241/library/friendlyhello:latest@sha256:05def471119a0937508cdcb2445cb55375d15257b0a117e954bcd3527c36eac2", "StopGracePeriod": 10000000000, "DNSConfig": {} "Isolation": "default"}, "Resources": {"Limits": {}, "Reservations": {}}, "RestartPolicy": {"Condition": "any" "Delay": 5000000000, "MaxAttempts": 0}, "Placement": {"Platforms": [{"Architecture": "amd64" "OS": "linux"}]}, "ForceUpdate": 0, "Runtime": "container"} "Mode": {"Replicated": {"Replicas": 1}}, "UpdateConfig": {"Parallelism": 1, "FailureAction": "pause", "Monitor": 5000000000, "MaxFailureRatio": 0 "Order": "stop-first"}, "RollbackConfig": {"Parallelism": 1, "FailureAction": "pause", "Monitor": 5000000000, "MaxFailureRatio": 0, "Order": "stop-first"} "EndpointSpec": {"Mode": "vip", "Ports": [{"Protocol": "tcp", "TargetPort": 80, "PublishedPort": 4000 "PublishMode": "ingress"}, "Endpoint": {"Spec": {"Mode": "vip" "Ports": [{"Protocol": "tcp", "TargetPort": 80, "PublishedPort": 4000, "PublishMode": "ingress"}]} "Ports": [{"Protocol": "tcp", "TargetPort": 80, "PublishedPort": 4000, "PublishMode": "ingress"}] "VirtualIPs": [{"NetworkID": "zhamhv5cl7zhr7c7g6n1so6kv" "Addr": "10.255.0.5 + 16"}]}] visit servicecurl http://172.31.68.241:4000-Icurl http://172.31.68.242:4000-Icurl http://172.31.68.243:4000-I
Ps: the service can be accessed normally if you access any node in the swarm mode cluster.
Extended servicedocker service scale hello=2
View the result docker service ps hello of the extended thickness
Swarm config creates configdocker config create hello-config. / hello-config
View configdocker config ls
View details docker config inspect hello-config
Use configdocker service create-- replicas 1-- name config-test-- config source=hello-config,target=/mnt/hello-config 172.31.68.241/library/friendlyhello in service
View the running workerdocker service ps config-test of task
Enter the container to view the configuration docker container lsdocker container exec-it b06c415e7cac / bin/bash
Ps: if the source/target of config is not specified when starting service, the default mount directory of config in the container is / hello-config
View local directory information for config
Config is usually under the / var/lib/docker/containers/container_id/mounts/secrets directory of the host where the container is located, and is a random string file.
Swarm secret
The difference between config and secret is that one is local and the other is stored in tmpfs.
Create secret# view secretr file cat hello-config-secret# create secretdocker secret create hello-secret. / hello-config-secret# view secretdocker secret ls
Start the service# startup service docker service create with secret using secret in service-- replicas 1-- label app-- secret hello-secret-- name secret-test 172.31.68.241/library/friendlyhello# to see on which machine task is running docker service ps secret-test
View the secret information in the container docker container exec-it 47c8f6f74ae3 / bin/bash
Ps: when using secret, the secret configuration is usually under the / run/secrets/ directory, and the name is secret name.
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