[英]My Docker container does not have IP address. Why?
我使用該命令啟動了一個rethinkDB
容器
docker pull rethinkdb:2.3
docker run --rm --name rethinkdb -v /srv/rethinkdb:/data --net host rethinkdb:2.3 rethinkdb --bind all --cache-size 8192 --no-update-check
現在容器已成功啟動。 我做了docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f288961ef376 rethinkdb:2.3 "rethinkdb --bind ..." 9 minutes ago Up 9 minutes rethinkdb
1f71722698ae sorccu/adb:latest "/sbin/tini -- adb..." 14 minutes ago Up 14 minutes adbd
現在我想找出這個容器的IP地址。 所以我做了
docker inspect --format '{{ .NetworkSettings.IPAddress }}' f288961ef376
它什么也沒歸我。 我找不到這個容器的IP地址。
我通過訪問http://localhost:8080
來檢查rethinkDB
配置頁面是否已啟動,我看到它已啟動並正在運行。
為什么這個容器沒有任何IP地址?
docker inspect
輸出如下
[
{
"Id": "f288961ef376531c97d2264cb8ef3c6077a6a75107905d6a47734303adfcb117",
"Created": "2017-05-05T11:13:45.382460184Z",
"Path": "rethinkdb",
"Args": [
"--bind",
"all",
"--cache-size",
"8192",
"--no-update-check"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 8157,
"ExitCode": 0,
"Error": "",
"StartedAt": "2017-05-05T11:13:45.774035358Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:c5ed876750b40cde4725ea9eb9d8503f4d1419a2f23ac2ef8e4cc1d535e2c3a2",
"ResolvConfPath": "/var/lib/docker/containers/f288961ef376531c97d2264cb8ef3c6077a6a75107905d6a47734303adfcb117/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/f288961ef376531c97d2264cb8ef3c6077a6a75107905d6a47734303adfcb117/hostname",
"HostsPath": "/var/lib/docker/containers/f288961ef376531c97d2264cb8ef3c6077a6a75107905d6a47734303adfcb117/hosts",
"LogPath": "/var/lib/docker/containers/f288961ef376531c97d2264cb8ef3c6077a6a75107905d6a47734303adfcb117/f288961ef376531c97d2264cb8ef3c6077a6a75107905d6a47734303adfcb117-json.log",
"Name": "/rethinkdb",
"RestartCount": 0,
"Driver": "aufs",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "docker-default",
"ExecIDs": null,
"HostConfig": {
"Binds": [
"/srv/rethinkdb:/data"
],
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "host",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": true,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": null,
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DiskQuota": 0,
"KernelMemory": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": -1,
"OomKillDisable": false,
"PidsLimit": 0,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0
},
"GraphDriver": {
"Data": null,
"Name": "aufs"
},
"Mounts": [
{
"Type": "bind",
"Source": "/srv/rethinkdb",
"Destination": "/data",
"Mode": "",
"RW": true,
"Propagation": ""
}
],
"Config": {
"Hostname": "dev-machine",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": true,
"AttachStderr": true,
"ExposedPorts": {
"28015/tcp": {},
"29015/tcp": {},
"8080/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"RETHINKDB_PACKAGE_VERSION=2.3.5~0jessie"
],
"Cmd": [
"rethinkdb",
"--bind",
"all",
"--cache-size",
"8192",
"--no-update-check"
],
"Image": "rethinkdb:2.3",
"Volumes": {
"/data": {}
},
"WorkingDir": "/data",
"Entrypoint": null,
"OnBuild": null,
"Labels": {}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "bd17bf8e1663ff18f6674a1a3a1665c4e1bf65283d358ffc97dc238ef4a79088",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "/var/run/docker/netns/default",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "",
"Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"MacAddress": "",
"Networks": {
"host": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "30b6150968580d33aae0e45f7d850b9e67ae2aa29e1bb837ca4fa74f2b0d4d42",
"EndpointID": "05e93ec514ee6694e57d344f3e4362252104347c3cc48c607708d125715ed6ec",
"Gateway": "",
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": ""
}
}
}
}
]
您正在使用--net host
選項啟動容器,這意味着您的容器將在主機網絡上運行。 點擊此處了解更多信息。 因此,您的容器可以通過主機的IP訪問。
一個非常基本的例子:
$ docker run --net=host -d jenkins
這將在您的真實主機網絡上運行jenkins。 因此,當您打開防火牆(jenkins在8080上運行)時,您將立即訪問您的容器。 所以我打開防火牆:
$ sudo iptables -I INPUT 5 -p tcp -m tcp --dport 8080 -j ACCEPT
我使用ifconfig
檢查我的eth0(主機網絡)的真實IP。 (我在VM上這樣做)。 它是192.168.140.7
。 我在瀏覽器中訪問192.168.140.7:8080,我看到了jenkins。 所以你的容器沒有自己的IP。 它在您的主機網絡和主機IP上運行。
如果保留--net host
選項,則將在默認的docker bridge網絡中創建容器,范圍為"172.17.0.0/16"
。 現在,您的容器將從該網絡的范圍內獲取IP。 要從外部訪問容器,您必須在主機網絡上映射端口(請參閱更多信息)。 您可以使用-p
選項執行此操作。
所以對於詹金斯的例子:
$ docker run -d -p 8888:8080 jenkins
當我執行docker inspect
我看到:
"IPAddress": "172.17.0.4",
所以我的容器在172.17.0.4:8080的橋接網絡中運行。 現在使用-p
選項我將我的橋接網絡的端口8080映射到我的主機網絡的8888上:so host-IP:8888
。 現在它可以從外面訪問。
您的容器ip與主機相同。 host
基本上說你的容器使用與主機相同的網絡接口。 它很快,因為沒有橋接但有限; 您必須確保您的容器不會偵聽同一端口以避免沖突。
最好堅持使用默認bridge
並指定要向主機公開的端口。 例如:
docker run --rm --name rethinkdb -v /srv/rethinkdb:/data -p 8080:8080 \
rethinkdb:2.3 rethinkdb --bind all --cache-size 8192 --no-update-check
順便說--net
,-- --net
已在以后版本的Docker中重命名為--network
。
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