一、安装启动consul
1.通过docker快速安装
#获取docker镜像 docker pull consul
2.启动consul
然后就可以启动集群了，这里启动4个Consul Agent，3个Server（会选举出一个leader），1个Client
#启动第1个Server节点，集群要求要有3个Server，将容器8500端口映射到主机8900端口，同时开启管理界面 docker run -d --name=consul1 -p 8900:8500 -e CONSUL_BIND_INTERFACE=eth0 consul agent --server=true --bootstrap-expect=3 --client=0.0.0.0 -ui #启动第2个Server节点，并加入集群 docker run -d --name=consul2 -e CONSUL_BIND_INTERFACE=eth0 consul agent --server=true --client=0.0.0.0 --join 172.17.0.2 #启动第3个Server节点，并加入集群 docker run -d --name=consul3 -e CONSUL_BIND_INTERFACE=eth0 consul agent --server=true --client=0.0.0.0 --join 172.17.0.2 #启动第4个Client节点，并加入集群 docker run -d --name=consul4 -e CONSUL_BIND_INTERFACE=eth0 consul agent --server=false --client=0.0.0.0 --join 172.17.0.2
第1个启动容器的IP一般是172.17.0.2，后边启动的几个容器IP会排着来：172.17.0.3、172.17.0.4、172.17.0.5。
这些Consul节点在Docker的容器内是互通的，他们通过桥接的模式通信。但是如果主机要访问容器内的网络，需要做端口映射。在启动第一个容器时，将Consul的8500端口映射到了主机的8900端口，这样就可以方便的通过主机的浏览器查看集群信息。
二、python服务注册
#pip install python-consul import consul class Consul(object): def __init__(self, host, port): '''初始化，连接consul服务器''' self._consul = consul.Consul(host, port) def RegisterService(self, name, host, port, tags=None): tags = tags or [] # 注册服务 self._consul.agent.service.register( name, name, host, port, tags, # 健康检查ip端口，检查时间：5,超时时间：30，注销时间：30s check=consul.Check().tcp(host, port, "5s", "30s", "30s")) def GetService(self, name): services = self._consul.agent.services() service = services.get(name) if not service: return None, None addr = "{0}:{1}".format(service['Address'], service['Port']) return service, addr if __name__ == '__main__': host="10.0.0.11" #consul服务器的ip port="8900" #consul服务器对外的端口 consul_client=Consul(host,port) name="maple" host="10.0.0.11" port=8900 consul_client.RegisterService(name,host,port) check = consul.Check().tcp(host, port, "5s", "30s", "30s") print(check) res=consul_client.GetService("maple") print(res)
#执行效果 {'tcp': '10.0.0.11:8900', 'interval': '5s', 'timeout': '30s', 'DeregisterCriticalServiceAfter': '30s'} ({'ID': 'maple', 'Service': 'maple', 'Tags': [], 'Meta': {}, 'Port': 8900, 'Address': '10.0.0.11', 'Weights': {'Passing': 1, 'Warning': 1}, 'EnableTagOverride': False}, '10.0.0.11:8900')
通过10.0.0.11:8900访问注册后的效果
三、golang服务注册
package main import ( "fmt" consul "github.com/hashicorp/consul/api" "strconv" "strings" ) type Consul struct { consul *consul.Client } //服务发现 用来注册自己的服务端口给别的服务器调用和发现其他服务器 func InitConsul(host string, port int) (*Consul) { config := consul.DefaultConfig() config.Address = fmt.Sprintf("%s:%d", host, port) c, err := consul.NewClient(config) if err != nil { panic(err) } return &Consul{ c, } } func (c *Consul) RegisterService(Name, Addr string, Port int, Tags ...string) error { return c.consul.Agent().ServiceRegister(&consul.AgentServiceRegistration{ ID: Name, Name: Name, Port: Port, Tags: Tags, Address: Addr, Check: &consul.AgentServiceCheck{ Timeout: "5s", Interval: "10s", TCP: fmt.Sprintf("%v:%v", Addr, Port, ), DeregisterCriticalServiceAfter: "30s", }, }) } func (c *Consul) GetService(Name string) (service *consul.AgentService, err error) { service, _, err = c.consul.Agent().Service(Name, &consul.QueryOptions{}) return } func main() { var Consul *Consul //注册consul服务地址 Host:="10.0.0.11" Port:=8900 Server:="10.0.0.11:8900" Name:="go_maple" Consul = InitConsul(Host,Port) serverHost, err := strconv.Atoi(strings.Split(Server, ":")[1]) if err != nil { panic(err) } err = Consul.RegisterService(Name,Host,serverHost) if err != nil { panic(err) } //获取服务 res,err:=Consul.GetService("go_maple") if err != nil { panic(err) } fmt.Println(res) }
四、通过API的方式获取信息
#http://10.0.0.11:8900/v1/health/service/maple [ { "Node": { "ID": "db46c9ad-5c8d-bb9b-0543-9edb48e7bccc", "Node": "71a1355e94b6", "Address": "172.17.0.2", "Datacenter": "dc1", "TaggedAddresses": { "lan": "172.17.0.2", "wan": "172.17.0.2" }, "Meta": { "consul-network-segment": "" }, "CreateIndex": 5, "ModifyIndex": 9 }, "Service": { "ID": "maple", "Service": "maple", "Tags": [], "Address": "10.0.0.11", "Meta": null, "Port": 8900, "Weights": { "Passing": 1, "Warning": 1 }, "EnableTagOverride": false, "ProxyDestination": "", "Proxy": {}, "Connect": {}, "CreateIndex": 4296, "ModifyIndex": 4296 }, "Checks": [ { "Node": "71a1355e94b6", "CheckID": "serfHealth", "Name": "Serf Health Status", "Status": "passing", "Notes": "", "Output": "Agent alive and reachable", "ServiceID": "", "ServiceName": "", "ServiceTags": [], "Definition": {}, "CreateIndex": 5, "ModifyIndex": 5 }, { "Node": "71a1355e94b6", "CheckID": "service:maple", "Name": "Service 'maple' check", "Status": "passing", "Notes": "", "Output": "TCP connect 10.0.0.11:8900: Success", "ServiceID": "maple", "ServiceName": "maple", "ServiceTags": [], "Definition": {}, "CreateIndex": 4296, "ModifyIndex": 4297 } ] } ]
#http://10.0.0.11:8900/v1/health/service/go_maple [ { "Node": { "ID": "db46c9ad-5c8d-bb9b-0543-9edb48e7bccc", "Node": "71a1355e94b6", "Address": "172.17.0.2", "Datacenter": "dc1", "TaggedAddresses": { "lan": "172.17.0.2", "wan": "172.17.0.2" }, "Meta": { "consul-network-segment": "" }, "CreateIndex": 5, "ModifyIndex": 9 }, "Service": { "ID": "go_maple", "Service": "go_maple", "Tags": [], "Address": "10.0.0.11", "Meta": null, "Port": 8900, "Weights": { "Passing": 1, "Warning": 1 }, "EnableTagOverride": false, "ProxyDestination": "", "Proxy": {}, "Connect": {}, "CreateIndex": 4725, "ModifyIndex": 4741 }, "Checks": [ { "Node": "71a1355e94b6", "CheckID": "serfHealth", "Name": "Serf Health Status", "Status": "passing", "Notes": "", "Output": "Agent alive and reachable", "ServiceID": "", "ServiceName": "", "ServiceTags": [], "Definition": {}, "CreateIndex": 5, "ModifyIndex": 5 }, { "Node": "71a1355e94b6", "CheckID": "service:go_maple", "Name": "Service 'go_maple' check", "Status": "passing", "Notes": "", "Output": "TCP connect 10.0.0.11:8900: Success", "ServiceID": "go_maple", "ServiceName": "go_maple", "ServiceTags": [], "Definition": {}, "CreateIndex": 4725, "ModifyIndex": 4742 } ] } ]