Docker: Cannot launch .Net Core 3.1 Web Api on browser after docker run
Question
I'm new to Docker and, as a start, I'm trying to accomplish a basic task, dockerize a .Net Core 3.1 Web Api and run it from the command line (not From Visual Studio where it actually works).
I create my project image using the following Dockerfile and with the next command:
docker build -t concepttest_crud1 .
Dockerfile (created by Visual Studio):
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY ["Gfi_ConceptTest_CRUD1/Gfi_ConceptTest_CRUD1.csproj", "Gfi_ConceptTest_CRUD1/"]
RUN dotnet restore "Gfi_ConceptTest_CRUD1/Gfi_ConceptTest_CRUD1.csproj"
COPY . .
WORKDIR "/src/Gfi_ConceptTest_CRUD1"
RUN dotnet build "Gfi_ConceptTest_CRUD1.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "Gfi_ConceptTest_CRUD1.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "Gfi_ConceptTest_CRUD1.dll"]
4) I run my image with the following command:
docker run -d -p 8080:44390 --name crud1 concepttest_crud1
where 44390 is the port I have my api configured on in Visual Studio.
When debugging I use to access the api through:
https://localhost:44390/api/Authors
5) I'm trying to test my dockerized api in Chrome with the next url:
https://localhost:8080/api/Authors
to no avail. No matter with url I try, my api won't start when the docker run command executes with no errors.
docker ps output:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8df6c92c6678 concepttest_crud1 "dotnet Gfi_ConceptT…" 22 minutes ago Up 22 minutes 0.0.0.0:8080->44390/tcp crud1
docker images output:
REPOSITORY TAG IMAGE ID CREATED SIZE
concepttest_crud1 latest 878e4c4845f6 About an hour ago 228MB
<none> <none> 36a29990113c About an hour ago 1GB
In the Docker images output I don't know why I see two images (a second with no name) when I expect only one.
I've also tried http://192.168.99.100:8080/api/Authors but it is not working either.
Edit 1: Adding docker inspect.
[
{
"Id": "0f0bf4b4de30ef5dd222016db639abe45e5e70bc25270b74df45eec64e319b57",
"Created": "2019-12-23T12:30:06.3947619Z",
"Path": "dotnet",
"Args": [
"Gfi_ConceptTest_CRUD1.dll"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 83477,
"ExitCode": 0,
"Error": "",
"StartedAt": "2019-12-23T12:30:08.9701219Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:92b9217abf5dc6a7fc6c10aac2ac5549d6873adfc1b3ed30264d6e1fd4a971c7",
"ResolvConfPath": "/var/lib/docker/containers/0f0bf4b4de30ef5dd222016db639abe45e5e70bc25270b74df45eec64e319b57/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/0f0bf4b4de30ef5dd222016db639abe45e5e70bc25270b74df45eec64e319b57/hostname",
"HostsPath": "/var/lib/docker/containers/0f0bf4b4de30ef5dd222016db639abe45e5e70bc25270b74df45eec64e319b57/hosts",
"LogPath": "/var/lib/docker/containers/0f0bf4b4de30ef5dd222016db639abe45e5e70bc25270b74df45eec64e319b57/0f0bf4b4de30ef5dd222016db639abe45e5e70bc25270b74df45eec64e319b57-json.log",
"Name": "/crud1",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {
"443/tcp": [
{
"HostIp": "",
"HostPort": "8080"
}
]
},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"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": [
28,
165
],
"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/overlay2/3781dd694db551736c551397e9a0834ebd6fa653e0b78b6d6244e15ef7b8c291-init/diff:/var/lib/docker/overlay2/025232b693c4a6470e0b26e5302e5165757dbc4a44d5af5b7b8aa8dacd77ee03/diff:/var/lib/docker/overlay2/bcca2356fe199bbaa471c3590a3f55df343eecd84899cf570197d97ed8111d95/diff:/var/lib/docker/overlay2/5f2d77acbd50bc4a8cde011128fb43b2a0cff888e716c5ba882d4dd906bc1901/diff:/var/lib/docker/overlay2/ca57ac72ac1d48b622745bb473fd71c18d67392b02cdf938835f05cf9b547681/diff:/var/lib/docker/overlay2/0b894b31b26df6e40b57a86dc66bbd4eda71d0ebf6d5755c4c43bc296e9a24de/diff:/var/lib/docker/overlay2/b6ca0109d2718605ccba2585e52ae1718cbecd2fcd62197f1f7fd505cf2be358/diff:/var/lib/docker/overlay2/e0ff62d02fe725053674ce9e3b59a4004c101fd2e98f919e5037a412f1c3a4e8/diff",
"MergedDir": "/var/lib/docker/overlay2/3781dd694db551736c551397e9a0834ebd6fa653e0b78b6d6244e15ef7b8c291/merged",
"UpperDir": "/var/lib/docker/overlay2/3781dd694db551736c551397e9a0834ebd6fa653e0b78b6d6244e15ef7b8c291/diff",
"WorkDir": "/var/lib/docker/overlay2/3781dd694db551736c551397e9a0834ebd6fa653e0b78b6d6244e15ef7b8c291/work"
},
"Name": "overlay2"
},
"Mounts": [],
"Config": {
"Hostname": "0f0bf4b4de30",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"443/tcp": {},
"8080/tcp": {}
},
"Tty": true,
"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"
],
"Cmd": null,
"Image": "crud1",
"Volumes": null,
"WorkingDir": "/app",
"Entrypoint": [
"dotnet",
"Gfi_ConceptTest_CRUD1.dll"
],
"OnBuild": null,
"Labels": {}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "ed889f3303ca17ad4e79ae917d8b17c5e590af502adb8049dbd7e0fcd46b323c",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"443/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "8080"
}
],
"8080/tcp": null
},
"SandboxKey": "/var/run/docker/netns/ed889f3303ca",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "001cd49640c4211e5eeb1eedacedd6de07022cc3362acaca59b82f0e537f6238",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:02",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "ccea227190a1f04d0043015cf3d9932ba41f4a96dfb9bc2a175a06483a9ca66e",
"EndpointID": "001cd49640c4211e5eeb1eedacedd6de07022cc3362acaca59b82f0e537f6238",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:02",
"DriverOpts": null
}
}
}
}
]
Edit 2: Added curl.
docker exec -it 0f0bf4b4de30 /bin/bash . root@4237f947b2b0:/app# curl https://localhost:8080/api/Authors
.: .: Is a directory
Edit 3: New curl
docker exec -it 0f0bf4b4de30 /bin/bash . root@4237f947b2b0:/app# curl https://localhost/api/Authors
.: .: Is a directory
1 answers
solution1
3 ACCPTED 2020-01-09 12:07:00
In my case it was due to having SSL enabled inthe project, but after removing everything related to https it started working as expected.
Having SSL enabled implies installing a SSL certificate inside the docker container and enabling it, things I wasn't able to do as I don't have a certificate and I'm just learning docker.
Steps I've done:
In Startup.cs I've disabled https redirection
//app.UseHttpsRedirection();
And in project properties under "Debug" section I unchecked "Enable SSL".
Then I was able to run the container as expected.
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