docker-compose 部署 flink

下载 flink 镜像

[root@localhost ~]# docker pull flink
Using default tag: latest
latest: Pulling from library/flink
762bedf4b1b7: Pull complete 
95f9bd9906fa: Pull complete 
a880dee0d8e9: Pull complete 
8c5deab9cbd6: Pull complete 
56c142282fae: Pull complete 
429468ac77e4: Pull complete 
c392a87beaaa: Pull complete 
f9dbdda9fdd9: Pull complete 
79ba4b85d71e: Pull complete 
fbb582e0bb4f: Pull complete 
3a1636493da1: Pull complete 
Digest: sha256:000006919395479c51dff9b1db67e6957bc2a9cdcda07c4e409edb5ba79a2a9a
Status: Downloaded newer image for flink:latest
docker.io/library/flink:latest

[root@localhost ~]# docker images
REPOSITORY            TAG       IMAGE ID       CREATED         SIZE
flink                 latest    19a46ae75631   5 weeks ago     798MB

[root@localhost ~]# docker history flink
IMAGE          CREATED       CREATED BY                                      SIZE      COMMENT
19a46ae75631   5 weeks ago   CMD ["help"]                                    0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   EXPOSE map[6123/tcp:{} 8081/tcp:{}]             0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   ENTRYPOINT ["/docker-entrypoint.sh"]            0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   COPY docker-entrypoint.sh / # buildkit          5.98kB    buildkit.dockerfile.v0
<missing>      5 weeks ago   RUN /bin/sh -c set -ex;   wget -nv -O flink.…   527MB     buildkit.dockerfile.v0
<missing>      5 weeks ago   WORKDIR /opt/flink                              0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   RUN /bin/sh -c groupadd --system --gid=9999 …   3.24MB    buildkit.dockerfile.v0
<missing>      5 weeks ago   ENV PATH=/opt/flink/bin:/opt/java/openjdk/bi…   0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   ENV FLINK_HOME=/opt/flink                       0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   ENV FLINK_TGZ_URL=https://dlcdn.apache.org/f…   0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   RUN /bin/sh -c set -ex;   wget -nv -O /usr/l…   2.3MB     buildkit.dockerfile.v0
<missing>      5 weeks ago   ENV GOSU_VERSION=1.11                           0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   RUN /bin/sh -c set -ex;   apt-get update;   …   10.7MB    buildkit.dockerfile.v0
<missing>      5 weeks ago   ENTRYPOINT ["/__cacert_entrypoint.sh"]          0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   COPY --chmod=755 entrypoint.sh /__cacert_ent…   4.74kB    buildkit.dockerfile.v0
<missing>      5 weeks ago   RUN /bin/sh -c set -eux;     echo "Verifying…   0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   RUN /bin/sh -c set -eux;     ARCH="$(dpkg --…   141MB     buildkit.dockerfile.v0
<missing>      5 weeks ago   ENV JAVA_VERSION=jdk-11.0.24+8                  0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   RUN /bin/sh -c set -eux;     apt-get update;…   36.1MB    buildkit.dockerfile.v0
<missing>      5 weeks ago   ENV LANG=en_US.UTF-8 LANGUAGE=en_US:en LC_AL…   0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   ENV PATH=/opt/java/openjdk/bin:/usr/local/sb…   0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   ENV JAVA_HOME=/opt/java/openjdk                 0B        buildkit.dockerfile.v0
<missing>      5 weeks ago   /bin/sh -c #(nop)  CMD ["/bin/bash"]            0B        
<missing>      5 weeks ago   /bin/sh -c #(nop) ADD file:2f8a54a5efd080fb8…   77.9MB    
<missing>      5 weeks ago   /bin/sh -c #(nop)  LABEL org.opencontainers.…   0B        
<missing>      5 weeks ago   /bin/sh -c #(nop)  LABEL org.opencontainers.…   0B        
<missing>      5 weeks ago   /bin/sh -c #(nop)  ARG LAUNCHPAD_BUILD_ARCH     0B        
<missing>      5 weeks ago   /bin/sh -c #(nop)  ARG RELEASE                  0B        

测试运行

[root@localhost ~]# docker run -it --rm flink java
[0.004s][warning][os,thread] Failed to start thread "GC Thread#0" - pthread_create failed (EPERM) for attributes: stacksize: 1024k, guardsize: 4k, detached.
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Cannot create worker GC thread. Out of system resources.
# An error report file with more information is saved as:
# /opt/flink/hs_err_pid44.log

搜索原因，需要开启 privileged 权限

privileged: true 这行配置启用了 taskmanager 容器的特权模式，使得容器内的进程可以获得几乎与主机上相同的权限。

注意事项：

• 安全性：启用特权模式会降低容器的安全性，因为它允许容器内的进程执行可能影响主机系统的操作。因此，只有在确实需要时才启用特权模式。
• 使用场景：特权模式通常用于需要访问主机设备（如 GPU、网络接口等）或执行特权操作（如挂载文件系统、修改内核参数等）的容器。

[root@localhost ~]# docker run -it --privileged --rm flink java -version
openjdk version "11.0.24" 2024-07-16
OpenJDK Runtime Environment Temurin-11.0.24+8 (build 11.0.24+8)
OpenJDK 64-Bit Server VM Temurin-11.0.24+8 (build 11.0.24+8, mixed mode, sharing)

docker-compose.yml

version: "3"
services:
  jobmanager:
    image: flink:latest
    privileged: true
    ports:
      - "8181:8081"
    command: jobmanager
    environment:
      - |
        FLINK_PROPERTIES=
        jobmanager.rpc.address: jobmanager        

  taskmanager:
    image: flink:latest
    privileged: true
    depends_on:
      - jobmanager
    command: taskmanager
    environment:
      - |
        FLINK_PROPERTIES=
        jobmanager.rpc.address: jobmanager
        taskmanager.numberOfTaskSlots: 2 

启动服务

[root@localhost xwtes]# docker-compose up -d --scale taskmanager=3
xwtes_jobmanager_1 is up-to-date
Starting xwtes_taskmanager_1 ... done
Creating xwtes_taskmanager_2 ... done
Creating xwtes_taskmanager_3 ... done