Random port binding not showing up in the .attr object

[abdelrahmanhosny]

I run a container and use the option ports={8000: None} in order to assign random port binding for this container. I then try to print the container.attr to look for what port did it bind to. It always get empty values: u'PortBindings': {u'8000/tcp': [{u'HostPort': u'', u'HostIp': u''}]}

I use the shell to make sure the container is running and binding ports correctly, and it works just fine. The container is indeed running the ports are bind correctly. But I need to access the port binding from the container object.

What is the problem here?

[shin-]

Try container.attrs['NetworkSettings']['Ports']

[abdelrahmanhosny]

So, ['NetworkSettings']['Ports'] is what is generated when using the docker inspect, and yes, it shows the port binding.

Here is the container.attrs:

{  
   u'ExecIDs':None,
   u'State':{  
      u'Status':u'created',
      u'Pid':0,
      u'OOMKilled':False,
      u'Dead':False,
      u'Paused':False,
      u'Running':False,
      u'FinishedAt':      u'0001-01-01T00:00:00      Z',
      u'Restarting':False,
      u'Error':u'',
      u'StartedAt':      u'0001-01-01T00:00:00      Z',
      u'ExitCode':0
   },
   u'Config':{  
      u'Tty':False,
      u'Cmd':None,
      u'Volumes':None,
      u'Domainname':u'',
      u'WorkingDir':u'',
      u'Image':      u'algorun/tophat:2.0.0',
      u'Hostname':u'07a0e7a22175',
      u'StdinOnce':False,
      u'ArgsEscaped':True,
      u'Labels':{  

      },
      u'AttachStdin':False,
      u'User':u'',
      u'Env':[  
         u'PATH=/home/algorithm/src/tophat:         /home/algorithm/src/bowtie2:         /usr/local/sbin:         /usr/local/bin:         /usr/sbin:         /usr/bin:         /sbin:/bin',
         u'CODE_HOME=/home/algorithm'
      ],
      u'ExposedPorts':{  
         u'8765/tcp':{  

         }
      },
      u'OnBuild':None,
      u'AttachStderr':False,
      u'Entrypoint':[  
         u'/usr/bin/nodejs',
         u'/home/algorithm/Server.js'
      ],
      u'AttachStdout':False,
      u'OpenStdin':False
   },
   u'ResolvConfPath':u'',
   u'HostsPath':u'',
   u'Args':[  
      u'/home/algorithm/Server.js'
   ],
   u'Driver':u'aufs',
   u'Path':u'/usr/bin/nodejs',
   u'HostnamePath':u'',
   u'RestartCount':0,
   u'Name':u'/tender_chandrasekhar',
   u'Created':   u'2017-02-06T21:22:21.834394115   Z',
   u'GraphDriver':{  
      u'Data':None,
      u'Name':u'aufs'
   },
   u'Mounts':[  

   ],
   u'ProcessLabel':u'',
   u'NetworkSettings':{  
      u'Bridge':u'',
      u'Networks':{  
         u'bridge':{  
            u'NetworkID':u'',
            u'MacAddress':u'',
            u'GlobalIPv6PrefixLen':0,
            u'Links':None,
            u'GlobalIPv6Address':u'',
            u'IPv6Gateway':u'',
            u'IPAMConfig':None,
            u'EndpointID':u'',
            u'IPPrefixLen':0,
            u'IPAddress':u'',
            u'Gateway':u'',
            u'Aliases':None
         }
      },
      u'SecondaryIPv6Addresses':None,
      u'LinkLocalIPv6Address':u'',
      u'HairpinMode':False,
      u'IPv6Gateway':u'',
      u'SecondaryIPAddresses':None,
      u'SandboxID':u'',
      u'MacAddress':u'',
      u'GlobalIPv6Address':u'',
      u'Gateway':u'',
      u'LinkLocalIPv6PrefixLen':0,
      u'EndpointID':u'',
      u'SandboxKey':u'',
      u'GlobalIPv6PrefixLen':0,
      u'IPPrefixLen':0,
      u'IPAddress':u'',
      u'Ports':None
   },
   u'AppArmorProfile':u'',
   u'Image':   u'sha256:b2c98afd2250321437e6195f581c3a468995b5728be459ac7c5d46e54d3f1b2a',
   u'LogPath':u'',
   u'HostConfig':{  
      u'CpuPeriod':0,
      u'MemorySwappiness':-1,
      u'ContainerIDFile':u'',
      u'KernelMemory':0,
      u'Memory':134217728,
      u'CpuQuota':0,
      u'UsernsMode':u'',
      u'AutoRemove':False,
      u'BlkioDeviceReadIOps':None,
      u'Dns':None,
      u'ExtraHosts':None,
      u'PidsLimit':0,
      u'DnsSearch':None,
      u'Privileged':False,
      u'IOMaximumIOps':0,
      u'CpuPercent':0,
      u'NanoCpus':0,
      u'Ulimits':None,
      u'CpusetCpus':u'',
      u'DiskQuota':0,
      u'CgroupParent':u'',
      u'BlkioWeight':0,
      u'RestartPolicy':{  
         u'MaximumRetryCount':0,
         u'Name':u''
      },
      u'OomScoreAdj':0,
      u'BlkioDeviceReadBps':None,
      u'VolumeDriver':u'',
      u'ReadonlyRootfs':False,
      u'CpuShares':0,
      u'PublishAllPorts':False,
      u'MemoryReservation':0,
      u'BlkioWeightDevice':None,
      u'ConsoleSize':[  
         0,
         0
      ],
      u'NetworkMode':u'default',
      u'BlkioDeviceWriteBps':None,
      u'Isolation':u'',
      u'GroupAdd':None,
      u'CpuRealtimeRuntime':0,
      u'Devices':None,
      u'BlkioDeviceWriteIOps':None,
      u'Binds':None,
      u'CpusetMems':u'',
      u'Cgroup':u'',
      u'UTSMode':u'',
      u'PidMode':u'',
      u'Runtime':u'runc',
      u'VolumesFrom':None,
      u'CapDrop':None,
      u'DnsOptions':None,
      u'ShmSize':67108864,
      u'Links':None,
      u'CpuRealtimePeriod':0,
      u'IpcMode':u'',
      u'PortBindings':{  
         u'8000/tcp':[  
            {  
               u'HostPort':u'',
               u'HostIp':u''
            }
         ]
      },
      u'SecurityOpt':None,
      u'CapAdd':None,
      u'CpuCount':0,
      u'MemorySwap':268435456,
      u'OomKillDisable':False,
      u'LogConfig':{  
         u'Config':{  

         },
         u'Type':u'json-file'
      },
      u'IOMaximumBandwidth':0
   },
   u'Id':u'07a0e7a221753a48b8e8c34ac7ad774b31e506008c96211230cebfb71131038e',
   u'MountLabel':u''
}

As you can see, there is no ['NetworkSettings']['Ports']

[shin-]

I believe you will have to call container.reload() to refresh the container info after it's allocated a port (i.e. once it's been started).

[abdelrahmanhosny]

I tried it and it didn't update. Should there be some lag time between the client.containers.run() line and the container.reload()?

[mccalluc]

I had the same initial problem, but immediately calling reload() does seem to fix it for me:

                      u'Ports': {u'443/tcp': None,
                                 u'80/tcp': [{u'HostIp': u'0.0.0.0',
                                              u'HostPort': u'32769'}]},

I'm running with docker==2.1.0. If I do reproduce it I'll comment here.

[oiwn]

Same issue.

Version 17.03.0-ce-mac2 (15654)
docker-py (1.10.6)