我的群体中有一个奇怪的问题，同一网络内的docker服务无法通信，当我尝试在它们之间进行通信时出现以下错误：
could not translate host name "dev_db" to address: Temporary failure in name resolution
我一直在调查他们是否在同一个网络上，并且根据检查他们是在同一个网络覆盖：
docker service inspect dev_slavedb
[
{
"ID": "flcwn7p17lgy6f9ad89iqas0e",
"Version": {
"Index": 68009
},
"CreatedAt": "2018-01-06T00:33:22.602060695Z",
"UpdatedAt": "2018-01-06T00:33:22.603561612Z",
"Spec": {
"Name": "dev_slavedb",
"Labels": {},
"TaskTemplate": {
"ContainerSpec": {
"Image": "postgres:latest@sha256:3f4441460029e12905a5d447a3549ae2ac13323d045391b0cb0cf8b48ea17463",
"Env": [
"POSTGRES_USER=mydatabase",
"POSTGRES_PASSWORD=mydatabase"
],
"Mounts": [
{
"Type": "volume",
"Source": "slave_postgres",
"Target": "/var/lib/postgresql/data"
}
],
"StopGracePeriod": 10000000000,
"DNSConfig": {}
},
"Resources": {
"Limits": {},
"Reservations": {}
},
"RestartPolicy": {
"Condition": "any",
"Delay": 5000000000,
"MaxAttempts": 0
},
"Placement": {
"Constraints": [
"node.hostname==swarm02"
],
"Platforms": [
{
"Architecture": "amd64",
"OS": "linux"
},
{
"OS": "linux"
},
{
"OS": "linux"
},
{
"Architecture": "arm64",
"OS": "linux"
},
{
"Architecture": "386",
"OS": "linux"
},
{
"Architecture": "ppc64le",
"OS": "linux"
},
{
"Architecture": "s390x",
"OS": "linux"
}
]
},
"Networks": [
{
"Target": "hh8zmhc9gx0p9iwukozo31dgs"
}
],
"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": 5432,
"PublishedPort": 5432,
"PublishMode": "host"
}
]
}
},
"Endpoint": {
"Spec": {
"Mode": "vip",
"Ports": [
{
"Protocol": "tcp",
"TargetPort": 5432,
"PublishedPort": 5432,
"PublishMode": "host"
}
]
},
"Ports": [
{
"Protocol": "tcp",
"TargetPort": 5432,
"PublishedPort": 5432,
"PublishMode": "host"
}
],
"VirtualIPs": [
{
"NetworkID": "hh8zmhc9gx0p9iwukozo31dgs",
"Addr": "10.0.0.4/24"
}
]
}
}
]
docker service inspect dev_db
[
{
"ID": "jqwmzoe57lonbr0wwnp262x9i",
"Version": {
"Index": 68001
},
"CreatedAt": "2018-01-06T00:30:50.284998521Z",
"UpdatedAt": "2018-01-06T00:30:50.285963303Z",
"Spec": {
"Name": "dev_db",
"Labels": {},
"TaskTemplate": {
"ContainerSpec": {
"Image": "postgres:latest@sha256:3f4441460029e12905a5d447a3549ae2ac13323d045391b0cb0cf8b48ea17463",
"Env": [
"POSTGRES_USER=mydatabase",
"POSTGRES_PASSWORD=mydatabase"
],
"Mounts": [
{
"Type": "volume",
"Source": "postgres",
"Target": "/var/lib/postgresql/data"
}
],
"StopGracePeriod": 10000000000,
"DNSConfig": {}
},
"Resources": {
"Limits": {},
"Reservations": {}
},
"RestartPolicy": {
"Condition": "any",
"Delay": 5000000000,
"MaxAttempts": 0
},
"Placement": {
"Constraints": [
"node.hostname==swarm01"
],
"Platforms": [
{
"Architecture": "amd64",
"OS": "linux"
},
{
"OS": "linux"
},
{
"OS": "linux"
},
{
"Architecture": "arm64",
"OS": "linux"
},
{
"Architecture": "386",
"OS": "linux"
},
{
"Architecture": "ppc64le",
"OS": "linux"
},
{
"Architecture": "s390x",
"OS": "linux"
}
]
},
"Networks": [
{
"Target": "hh8zmhc9gx0p9iwukozo31dgs"
}
],
"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": 5432,
"PublishedPort": 5432,
"PublishMode": "host"
}
]
}
},
"Endpoint": {
"Spec": {
"Mode": "vip",
"Ports": [
{
"Protocol": "tcp",
"TargetPort": 5432,
"PublishedPort": 5432,
"PublishMode": "host"
}
]
},
"Ports": [
{
"Protocol": "tcp",
"TargetPort": 5432,
"PublishedPort": 5432,
"PublishMode": "host"
}
],
"VirtualIPs": [
{
"NetworkID": "hh8zmhc9gx0p9iwukozo31dgs",
"Addr": "10.0.0.2/24"
}
]
}
}
]
即使我尝试使用他们的VIP（10.0.0.2和10.0.0.4），我也会得到同样的错误。我不知道如何解决这个问题，任何想法都值得赞赏。
答案 0 :(得分：0)
我建议您尝试自己创建Overlay网络，以确保它确实有效。创建覆盖网络后，您可以根据需要将所有节点添加到子网并以这种方式访问它们，或者通过更复杂的路径，您可以在它们之间创建ssh通道，以确保您可以控制通信。
答案 1 :(得分：0)
确保在每个Swarm节点上打开正确的防火墙端口以允许其他节点进入，否则不会发生DNS和其他通信等事件：