Error in Apache Ignite C# Client connection for kubernetes-CodePudding

We followed the solution suggested in Apache Ignite C# Client Connection configuration for kubernetes as thick client to connect the ignite cluster running in kubrenetes.

We get the below error message on start:

failed to start: System.EntryPointNotFoundException: Unable to find an entry point named 'dlopen' in shared library 'libcoreclr.so'. at Apache.Ignite.Core.Impl.Unmanaged.Jni.DllLoader.NativeMethodsCore.dlopen(String filename, Int32 flags) at Apache.Ignite.Core.Impl.Unmanaged.Jni.DllLoader.Load(String dllPath) at Apache.Ignite.Core.Impl.Unmanaged.Jni.JvmDll.LoadDll(String filePath, String simpleName) at Apache.Ignite.Core.Impl.Unmanaged.Jni.JvmDll.Load(String configJvmDllPath, ILogger log) at Apache.Ignite.Core.Ignition.Start(IgniteConfiguration cfg)

We included the openjdk8 in the docker image. Here is the docker file.


#FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
#WORKDIR /app
#EXPOSE 80
#EXPOSE 443


ARG REPO=mcr.microsoft.com/dotnet/core/runtime
FROM $REPO:3.1-alpine3.10 AS base
# Install ASP.NET Core
RUN aspnetcore_version=3.1 \
    && wget -O aspnetcore.tar.gz https://dotnetcli.azureedge.net/dotnet/aspnetcore/Runtime/$aspnetcore_version/aspnetcore-runtime-$aspnetcore_version-linux-musl-x64.tar.gz \
    && aspnetcore_sha512='fa5e4ae71134a8a6db4ad6a247d3e31406673e03f0a64f7faaad3d84cfb3b70d2cf69e9d9abc1f8688138907d4ddd37cd908669999d85a87892e164053c63847' \
    && echo "$aspnetcore_sha512  aspnetcore.tar.gz" | sha512sum -c - \
    && tar -ozxf aspnetcore.tar.gz -C /usr/share/dotnet ./shared/Microsoft.AspNetCore.App \
    && rm aspnetcore.tar.gz

ENV LANG C.UTF-8

# add a simple script that can auto-detect the appropriate JAVA_HOME value
# based on whether the JDK or only the JRE is installed
RUN { \
        echo '#!/bin/sh'; \
        echo 'set -e'; \
        echo; \
        echo 'dirname "$(dirname "$(readlink -f "$(which javac || which java)")")"'; \
    } > /usr/local/bin/docker-java-home \
    && chmod  x /usr/local/bin/docker-java-home
ENV JAVA_HOME /usr/lib/jvm/java-1.8-openjdk
ENV PATH $PATH:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin

ENV JAVA_VERSION 8u181
ENV JAVA_ALPINE_VERSION 8.275.01-r0

RUN set -x \
    && apk add --no-cache \
        openjdk8="$JAVA_ALPINE_VERSION" \
    && [ "$JAVA_HOME" = "$(docker-java-home)" ]

WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
...
RUN dotnet restore "API.csproj"
COPY . .
WORKDIR "API"
RUN dotnet build "API.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "API.csproj" -c Release -o /app/publish

FROM base AS final


WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "API.dll"]````

CodePudding user response：

This Ignite issue on Alpine Linux was fixed in 2.13, which was released yesterday - please try upgrading.

https://issues.apache.org/jira/browse/IGNITE-16749 https://www.nuget.org/packages/Apache.Ignite/2.13.0

CodePudding user response：

In addition to Pavel's response, instead of building your own docker image, you can utilize base image available in GridGain edition: https://hub.docker.com/r/gridgain/community-dotnet

GridGain Community edition is built on Apache Ignite, is free and open source as well. You might check the official docs for more details.