I created an image with Asp.Net.
The Dockerfile looks like
FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 80
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["AspMini/AspMini.csproj", "AspMini/"]
RUN dotnet restore "AspMini/AspMini.csproj"
COPY . .
WORKDIR "/src/AspMini"
RUN dotnet build "AspMini.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "AspMini.csproj" -c Release -o /app/publish /p:UseAppHost=false
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "AspMini.dll"]
However if i start a container with
docker run theImageName -d -p 8090:80
the mapping gets ignored. I can’t access the api on localhost:8090.
The docker inspect output:
docker inspect 991f8f09c1a6
[
{
"Id": "991f8f09c1a618ad05ca3910f9f570c15217f6753ce0fbb07203de21df66310a",
"Created": "2023-01-13T14:42:03.686922616Z",
"Path": "dotnet",
"Args": [
"AspMini.dll",
"-d",
"-p",
"8090:80"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 1748,
"ExitCode": 0,
"Error": "",
"StartedAt": "2023-01-13T14:42:04.089973705Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Name": "/beautiful_gagarin",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"CgroupnsMode": "host",
"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": [
35,
161
],
"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/overlay2/9c973e90ec99d50f84e8ee2747fa4646d5f8599a2f03646ac5301418cb542a88-init/diff:/var/lib/docker/overlay2/603fdf539efa645bb21ef84b7b3f6c0d833fbd03faad8dffd5defa4b68bbb42b/diff:/var/lib/docker/overlay2/7ba1ebf47509f54abc170cf2a0d57e03513c7ed94f05f6b836abaacf9a304c18/diff:/var/lib/docker/overlay2/87a8e5b62cb7841e224f121dac133fc1de10c7e11a71d908da9991423cab318d/diff:/var/lib/docker/overlay2/ac3471c9a4388af7f1a556b6796a6d7eb640d6831983b3ff7cc9c41361d674e8/diff:/var/lib/docker/overlay2/03d18c531853da913373bae78ddba3986d90705862c1ac84a49d9ec8ba9ce9c5/diff:/var/lib/docker/overlay2/d179824e5cc7707e84a46192e2c5d93d297828703c555747395a8173034152e6/diff:/var/lib/docker/overlay2/bbb62ce4f5330dca608c3d7ce8ef9e621d12bbae16a1634b23950033e629afa3/diff",
"MergedDir": "/var/lib/docker/overlay2/9c973e90ec99d50f84e8ee2747fa4646d5f8599a2f03646ac5301418cb542a88/merged",
"UpperDir": "/var/lib/docker/overlay2/9c973e90ec99d50f84e8ee2747fa4646d5f8599a2f03646ac5301418cb542a88/diff",
"WorkDir": "/var/lib/docker/overlay2/9c973e90ec99d50f84e8ee2747fa4646d5f8599a2f03646ac5301418cb542a88/work"
},
"Name": "overlay2"
},
"Mounts": [],
"Config": {
"Hostname": "991f8f09c1a6",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": true,
"AttachStderr": true,
"ExposedPorts": {
"80/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"ASPNETCORE_URLS=http://+:80",
"DOTNET_RUNNING_IN_CONTAINER=true",
"DOTNET_VERSION=6.0.13",
"ASPNET_VERSION=6.0.13"
],
"Cmd": [
"-d",
"-p",
"8090:80"
],
"Image": "aspmini",
"Volumes": null,
"WorkingDir": "/app",
"Entrypoint": [
"dotnet",
"AspMini.dll"
],
"OnBuild": null,
"Labels": {}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "5a2a584a1c775babb79a9a1434d3762c8511f1ac124084cde9147a3427ef2c73",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"80/tcp": null
},
"SandboxKey": "/var/run/docker/netns/5a2a584a1c77",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "9618ce41bddab811bcecbf107db63fde2153f60ca8926f48ac4e6610edc89749",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.3",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:03",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "75751644df6485eacd29cb213ee4ab2bee73f1214b9e99371406df1df39591d8",
"EndpointID": "9618ce41bddab811bcecbf107db63fde2153f60ca8926f48ac4e6610edc89749",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.3",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:03",
"DriverOpts": null
}
}
}
}
]
PortBindings is just empty. But if i start the Container over the GUI:
it works. Why is the -p flag ignored?
>Solution :
On the docker run command, parameters in front of the image name are Docker parameters and parameters after the image name are for the program running in the image.
-p and -d are for Docker, so they need to go in front of the image name, like this
docker run -d -p 8090:80 theImageName