docker network use host mode not working(no port expose)

Question

This is my information:

➜  ~ docker -v
Docker version 19.03.5, build 633a0ea
➜  ~ uname -ar
Darwin Felixs-iMac.local 19.2.0 Darwin Kernel Version 19.2.0: Sat Nov  9 03:47:04 PST 2019; root:xnu-6153.61.1~20/RELEASE_X86_64 x86_64

When I create a docker with host network mode like this:

docker run --rm -d --network host --name my_nginx nginx

It worked well and I can see the docker is running. The problem is the port isn't exposed. When I check with lsof -i:80, there's nothing.

➜  ~ docker run --rm -d --network host --name my_nginx nginx
282fe15a16b70d7bd38b770fd2b67f0023b8fce1f9852a91af4047ef8f6a3f0d
➜  ~ lsof -i:80
➜  ~ docker ps
CONTAINER ID        IMAGE                   COMMAND                  CREATED              STATUS              PORTS                               NAMES
282fe15a16b7        nginx                   "nginx -g 'daemon of…"   About a minute ago   Up About a minute

And I inspected the container, everything seems good:

➜  ~ docker inspect my_nginx
[
    {
        "Id": "282fe15a16b70d7bd38b770fd2b67f0023b8fce1f9852a91af4047ef8f6a3f0d",
        "Created": "2020-02-26T15:35:58.243963941Z",
        "Path": "nginx",
        "Args": [
            "-g",
            "daemon off;"
        ],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 2238,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2020-02-26T15:35:58.39452216Z",
            "FinishedAt": "0001-01-01T00:00:00Z"
        },
        "Image": "sha256:2073e0bcb60ee98548d313ead5eacbfe16d9054f8800a32bedd859922a99a6e1",
        "ResolvConfPath": "/var/lib/docker/containers/282fe15a16b70d7bd38b770fd2b67f0023b8fce1f9852a91af4047ef8f6a3f0d/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/282fe15a16b70d7bd38b770fd2b67f0023b8fce1f9852a91af4047ef8f6a3f0d/hostname",
        "HostsPath": "/var/lib/docker/containers/282fe15a16b70d7bd38b770fd2b67f0023b8fce1f9852a91af4047ef8f6a3f0d/hosts",
        "LogPath": "/var/lib/docker/containers/282fe15a16b70d7bd38b770fd2b67f0023b8fce1f9852a91af4047ef8f6a3f0d/282fe15a16b70d7bd38b770fd2b67f0023b8fce1f9852a91af4047ef8f6a3f0d-json.log",
        "Name": "/my_nginx",
        "RestartCount": 0,
        "Driver": "overlay2",
        "Platform": "linux",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "",
        "ExecIDs": null,
        "HostConfig": {
            "Binds": null,
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "json-file",
                "Config": {}
            },
            "NetworkMode": "host",
            "PortBindings": {},
            "RestartPolicy": {
                "Name": "no",
                "MaximumRetryCount": 0
            },
            "AutoRemove": true,
            "VolumeDriver": "",
            "VolumesFrom": null,
            "CapAdd": null,
            "CapDrop": null,
            "Capabilities": null,
            "Dns": [],
            "DnsOptions": [],
            "DnsSearch": [],
            "ExtraHosts": null,
            "GroupAdd": null,
            "IpcMode": "private",
            "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": [],
            "BlkioDeviceReadBps": null,
            "BlkioDeviceWriteBps": null,
            "BlkioDeviceReadIOps": null,
            "BlkioDeviceWriteIOps": null,
            "CpuPeriod": 0,
            "CpuQuota": 0,
            "CpuRealtimePeriod": 0,
            "CpuRealtimeRuntime": 0,
            "CpusetCpus": "",
            "CpusetMems": "",
            "Devices": [],
            "DeviceCgroupRules": null,
            "DeviceRequests": null,
            "KernelMemory": 0,
            "KernelMemoryTCP": 0,
            "MemoryReservation": 0,
            "MemorySwap": 0,
            "MemorySwappiness": null,
            "OomKillDisable": false,
            "PidsLimit": null,
            "Ulimits": null,
            "CpuCount": 0,
            "CpuPercent": 0,
            "IOMaximumIOps": 0,
            "IOMaximumBandwidth": 0,
            "MaskedPaths": [
                "/proc/asound",
                "/proc/acpi",
                "/proc/kcore",
                "/proc/keys",
                "/proc/latency_stats",
                "/proc/timer_list",
                "/proc/timer_stats",
                "/proc/sched_debug",
                "/proc/scsi",
                "/sys/firmware"
            ],
            "ReadonlyPaths": [
                "/proc/bus",
                "/proc/fs",
                "/proc/irq",
                "/proc/sys",
                "/proc/sysrq-trigger"
            ]
        },
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/062cb6ccb41fb22ba624fb8f93e99e79bcf02cd240fbb4998e47aab1380e015f-init/diff:/var/lib/docker/overlay2/587f9f458f8f0de65434971354636364ff685701fa1f8ba0ba7da4459e22540c/diff:/var/lib/docker/overlay2/1a94586d0949b8305ac14f0934a46149b31db3eb6e7125d7b2965deef318695d/diff:/var/lib/docker/overlay2/ac900d4637ed15f3337e999928ec2a9de2ef4a998f4ce53700a1dffc955d5f0e/diff",
                "MergedDir": "/var/lib/docker/overlay2/062cb6ccb41fb22ba624fb8f93e99e79bcf02cd240fbb4998e47aab1380e015f/merged",
                "UpperDir": "/var/lib/docker/overlay2/062cb6ccb41fb22ba624fb8f93e99e79bcf02cd240fbb4998e47aab1380e015f/diff",
                "WorkDir": "/var/lib/docker/overlay2/062cb6ccb41fb22ba624fb8f93e99e79bcf02cd240fbb4998e47aab1380e015f/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [],
        "Config": {
            "Hostname": "docker-desktop",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "80/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "NGINX_VERSION=1.17.8",
                "NJS_VERSION=0.3.8",
                "PKG_RELEASE=1~buster"
            ],
            "Cmd": [
                "nginx",
                "-g",
                "daemon off;"
            ],
            "Image": "nginx",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "maintainer": "NGINX Docker Maintainers <[email protected]>"
            },
            "StopSignal": "SIGTERM"
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "be4dc476e331bb8ac857ec069d0aa8383d7700ba5b917c0fed44c59d0b042c99",
            "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": "56456bd40ca98647fed01509408599accfadc7cb0f0077ea884b18fc009801b5",
                    "EndpointID": "e3e870245e2995fbfbae8706fa2daa19f3bf3d59d11d2f8ce2300f2b84b211e0",
                    "Gateway": "",
                    "IPAddress": "",
                    "IPPrefixLen": 0,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "",
                    "DriverOpts": null
                }
            }
        }
    }
]

Answer 1

Docker Desktop added general support for "host networking" with version 4.34 and later. To enable the feature you have to be signed in, go to Settings, within the Resources choose Network and then check the Enable host networking. Docker Desktop must be restarted for the change to take affect

For details look at the documentation