Azure / Azure/azure-functions-docker
The official image mcr.microsoft.com/azure-functions/dotnet-isolated:4-dotnet-isolated8.0 is currently polluted with in-process WebJobs artifacts.
- Dominant language
- Dockerfile
- Stars
- 280
- Forks
- 126
- PR merge metrics
- No merged PRs in 30d
Description
When I try to run an isolated docker, the container crashes, since it seems to be poluted
```
docker % docker run --rm -it mcr.microsoft.com/azure-functions/dotnet-isolated:4-dotnet-isolated8.0 ls -l /azure-functions-host | grep -i webjobs
Unable to find image 'mcr.microsoft.com/azure-functions/dotnet-isolated:4-dotnet-isolated8.0' locally
4-dotnet-isolated8.0: Pulling from azure-functions/dotnet-isolated
d107e437f729: Already exists
c8dc41235996: Already exists
7c2c457f0889: Already exists
a37ef0701ba8: Already exists
e0b0ecf09218: Already exists
a85b88f0cfff: Already exists
578d61833fb1: Already exists
76b94a98d2b8: Already exists
4ae45320b9a1: Already exists
da7884dff6d2: Already exists
b1242459acc1: Already exists
2ca5673985df: Already exists
c65a965cb8f1: Already exists
409ecca27b94: Already exists
8ec5e490e519: Already exists
2731913c617a: Already exists
Digest: sha256:9cd018c36604776c5c6aaf16f2161b423c1278143c82514cf0d7ef88285b2dd6
Status: Downloaded newer image for mcr.microsoft.com/azure-functions/dotnet-isolated:4-dotnet-isolated8.0
-rw-r--r-- 1 root root 61440 Sep 10 04:52 Microsoft.Azure.WebJobs.Extensions.Http.dll
-rw-r--r-- 1 root root 16384 Sep 10 04:52 Microsoft.Azure.WebJobs.Extensions.Timers.Storage.dll
-rw-r--r-- 1 root root 91136 Sep 10 04:52 Microsoft.Azure.WebJobs.Extensions.dll
-rw-r--r-- 1 root root 50688 Sep 10 04:52 Microsoft.Azure.WebJobs.Host.Storage.dll
-rw-r--r-- 1 root root 711168 Sep 10 04:52 Microsoft.Azure.WebJobs.Host.dll
-rw-r--r-- 1 root root 85504 Sep 10 04:52 Microsoft.Azure.WebJobs.Logging.ApplicationInsights.dll
-rw-r--r-- 1 root root 15872 Sep 10 04:52 Microsoft.Azure.WebJobs.Rpc.Core.dll
-rw-r--r-- 1 root root 19456 Sep 10 04:52 Microsoft.Azure.WebJobs.Script.Abstractions.dll
-rw-r--r-- 1 root root 403968 Sep 10 04:52 Microsoft.Azure.WebJobs.Script.Grpc.dll
-rwxr-xr-x 1 root root 72568 Sep 10 04:50 Microsoft.Azure.WebJobs.Script.WebHost
-rw-r--r-- 1 root root 271324 Sep 10 04:52 Microsoft.Azure.WebJobs.Script.WebHost.deps.json
-rw-r--r-- 1 root root 1083904 Sep 10 04:52 Microsoft.Azure.WebJobs.Script.WebHost.dll
-rw-r--r-- 1 root root 141427200 Sep 10 04:52 Microsoft.Azure.WebJobs.Script.WebHost.r2r.dll
-rw-r--r-- 1 root root 105919608 Sep 10 04:52 Microsoft.Azure.WebJobs.Script.WebHost.r2r.ni.r2rmap
-rw-r--r-- 1 root root 685 Sep 10 04:51 Microsoft.Azure.WebJobs.Script.WebHost.runtimeconfig.json
-rw-r--r-- 1 root root 1288192 Sep 10 04:52 Microsoft.Azure.WebJobs.Script.dll
-rw-r--r-- 1 root root 11616 Sep 10 04:49 Microsoft.Azure.WebJobs.Script.dll.config
-rw-r--r-- 1 root root 19968 Sep 10 04:52 Microsoft.Azure.WebJobs.dll
docker %
```
If I understand correct, these files cause the issue.
When I start the docker, it immediately crashes and This is the log
```
2025-09-12 12:11:21 WEBSITES_INCLUDE_CLOUD_CERTS is not set to true.
2025-09-12 12:11:21 Unhandled exception. System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.AspNetCore.Hosting.Abstractions, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.
2025-09-12 12:11:21
2025-09-12 12:11:21 File name: 'Microsoft.AspNetCore.Hosting.Abstractions, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'
2025-09-12 12:11:21 at Microsoft.Azure.WebJobs.Script.WebHost.Program.CreateWebHostBuilder
2025-09-12 12:11:21 at Microsoft.Azure.WebJobs.Script.WebHost.Program.BuildWebHost in //src/WebJobs.Script.WebHost/Program.cs:line 36
2025-09-12 12:11:21 at Microsoft.Azure.WebJobs.Script.WebHost.Program.Main(String[] args) in //src/WebJobs.Script.WebHost/Program.cs:line 28
2025-09-12 12:11:21 /opt/startup/start_nonappservice.sh: line 4: 9 Aborted /azure-functions-host/Microsoft.Azure.WebJobs.Script.WebHost
```
This is my proj file:
```
net8.0
v4
Exe
enable
enable
PreserveNewest
```
my DockerFile:
```
# Build stage
FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
WORKDIR /src
COPY *.csproj ./
COPY Functions ./Functions
COPY Helpers ./Helpers
COPY Models ./Models
COPY Services ./Services
COPY Program.cs ./
COPY host.json ./
# (repeat for any other needed files/folders)
RUN dotnet publish -c Release -o /app/publish && ls -l /app/publish
# Runtime stage
FROM mcr.microsoft.com/azure-functions/dotnet-isolated:4-dotnet-isolated8.0
WORKDIR /azure-functions-host
COPY --from=build /app/publish/. .
COPY worker.config.json ./
COPY extensions.json ./
RUN ls -l /azure-functions-host
RUN ls -l /app/publish && find /app/publish | grep WebJobs || true
EXPOSE 8080
ENV AzureWebJobsScriptRoot=/azure-functions-host
```
Contributor guide
No contributing guide indexed for this repository
Research direction
Start by reproducing the failure with mcr.microsoft.com/azure-functions/dotnet-isolated:4-dotnet-isolated8.0 and compare its /azure-functions-host contents with the supplied Dockerfile's published output. Trace the base-image build definition in this repository; done means the isolated image starts successfully without the reported assembly error or unintended WebJobs artifacts.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- docker
- Domain
- infrastructure
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100