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docker - 在Docker容器中杀死一个 fork 的进程，使该容器在Jenkins docker slave插件上退出

转载 作者：行者123 更新时间：2023-12-02 19:35:43 30 4
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我正在使用docker进行构建和测试。在测试过程中，我的测试用例将启动一个单独的进程(mongod进程)，并且在测试用例完成后将终止该进程。在整个测试用例运行期间，mongod进程将被生成并杀死多次。我的问题是当mongod进程被杀死时，docker容器退出，代码为137。我的docker文件如下:

FROM ubuntu

RUN sed -i -e 's/us.archive.ubuntu.com/archive.ubuntu.com/g' /etc/apt/sources.list && apt-get update && apt-get install -y curl

RUN apt-get update && apt-get install -y --no-install-recommends \
    openssh-client openssh-server rsync vim \
    dh-autoreconf libcurl4-gnutls-dev libexpat1-dev gettext libz-dev libssl-dev \
    && curl -OL https://github.com/git/git/archive/v2.13.1.tar.gz \
    && tar -zxf v2.13.1.tar.gz && cd git-2.13.1 && make configure && ./configure --prefix=/usr && make all && make install && cd .. \
    && apt-get remove -y dh-autoreconf libcurl4-gnutls-dev libexpat1-dev gettext libz-dev libssl-dev \
    && rm -rf v2.13.1.tar.gz git-2.13.1 \
    && rm -rf /var/lib/apt/lists/*

RUN echo "unsafe-perm = true" > /root/.npmrc \
    && echo "Australia/Melbourne" > /etc/timezone 
    # && dpkg-reconfigure -f noninteractive tzdata

RUN curl -sL https://deb.nodesource.com/setup_7.x | bash - && apt-get install -y nodejs && npm install -g yarn

RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    python \ 
    python-pip python-dev \
          && rm -rf /var/lib/apt/lists/* \
    && yarn global add node-gyp && pip install --upgrade pip && pip install setuptools


RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 0C49F3730359A14518585931BC711F9BA15703C6 \
    && echo "deb http://repo.mongodb.org/apt/debian jessie/mongodb-org/3.4 main" | tee /etc/apt/sources.list.d/mongodb-org-3.4.list 

RUN apt-get update && apt-get install -y --no-install-recommends \
    mongodb-org \
    python-pip python-dev \
    && pip install mtools pymongo numpy \
      && rm -rf /var/lib/apt/lists/*
USER root
RUN adduser jenkins
RUN chmod 777 /home/jenkins
ADD ./.aws /home/jenkins/.aws
USER jenkins

我使用以下命令启动 mongod进程: 
mongod --dbpath /home/jenkins/.jenkins/data/db --logpath /home/jenkins/.jenkins/data/mongod.log --port 27017 --logappend --fork

对我来说，在本地运行项目测试用例没有问题。所以我认为这与docker有关。我的 docker 正在 CoreOS中运行。版本是: 
$ docker --version
Docker version 17.05.0-ce, build 89658be

该容器由 jenkins docker slave插件启动。经过一些调查，如果我通过 docker run -it -d $NAME bash手动启动容器，则可以正常运行，但是如果我是 Jenkins docker slave启动的容器，则无法正常运行。我不知道哪个启动命令可能会导致此问题。如何在不更改docker launcher命令的情况下解决此问题？

以下是 docker inspect输出: 
[
    {
        "Id": "81ffad4b15115077dda23c221eb8053915f41cdf0e75de4417d23f81df12f87f",
        "Created": "2017-07-28T01:08:40.598084613Z",
        "Path": "/trampoline",
        "Args": [
            "wait"
        ],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 14152,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2017-07-28T01:08:41.044051569Z",
            "FinishedAt": "0001-01-01T00:00:00Z"
        },
        "Image": "sha256:7d1e60ecf32337654f46c54b05e3db11f724f12c4f879ccd42c9566c59edc6b2",
        "ResolvConfPath": "/var/lib/docker/containers/097e51587d94fa0282ee51f6b84c006a6a410aadb2891f24b25caf41a1d14f39/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/097e51587d94fa0282ee51f6b84c006a6a410aadb2891f24b25caf41a1d14f39/hostname",
        "HostsPath": "/var/lib/docker/containers/097e51587d94fa0282ee51f6b84c006a6a410aadb2891f24b25caf41a1d14f39/hosts",
        "LogPath": "/var/lib/docker/containers/81ffad4b15115077dda23c221eb8053915f41cdf0e75de4417d23f81df12f87f/81ffad4b15115077dda23c221eb8053915f41cdf0e75de4417d23f81df12f87f-json.log",
        "Name": "/heuristic_ritchie",
        "RestartCount": 0,
        "Driver": "overlay2",
        "MountLabel": "system_u:object_r:svirt_lxc_file_t:s0:c896,c995",
        "ProcessLabel": "system_u:system_r:svirt_lxc_net_t:s0:c896,c995",
        "AppArmorProfile": "",
        "ExecIDs": [
            "a827e4666391224dc9b3e7f94ea3a7615fb5215c82de6a481289fa125bf9495f"
        ],
        "HostConfig": {
            "Binds": null,
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "json-file",
                "Config": {}
            },
            "NetworkMode": "container:097e51587d94fa0282ee51f6b84c006a6a410aadb2891f24b25caf41a1d14f39",
            "PortBindings": {},
            "RestartPolicy": {
                "Name": "no",
                "MaximumRetryCount": 0
            },
            "AutoRemove": false,
            "VolumeDriver": "",
            "VolumesFrom": [
                "097e51587d94fa0282ee51f6b84c006a6a410aadb2891f24b25caf41a1d14f39"
            ],
            "CapAdd": null,
            "CapDrop": null,
            "Dns": [],
            "DnsOptions": [],
            "DnsSearch": [],
            "ExtraHosts": null,
            "GroupAdd": null,
            "IpcMode": "container:097e51587d94fa0282ee51f6b84c006a6a410aadb2891f24b25caf41a1d14f39",
            "Cgroup": "",
            "Links": null,
            "OomScoreAdj": 0,
            "PidMode": "",
            "Privileged": false,
            "PublishAllPorts": false,
            "ReadonlyRootfs": false,
            "SecurityOpt": [
                "label=user:system_u",
                "label=role:system_r",
                "label=type:svirt_lxc_net_t",
                "label=level:s0:c896,c995"
            ],
            "UTSMode": "",
            "UsernsMode": "",
            "ShmSize": 67108864,
            "Runtime": "runc",
            "ConsoleSize": [
                0,
                0
            ],
            "Isolation": "",
            "CpuShares": 0,
            "Memory": 4294967296,
            "NanoCpus": 0,
            "CgroupParent": "",
            "BlkioWeight": 0,
            "BlkioWeightDevice": null,
            "BlkioDeviceReadBps": null,
            "BlkioDeviceWriteBps": null,
            "BlkioDeviceReadIOps": null,
            "BlkioDeviceWriteIOps": null,
            "CpuPeriod": 0,
            "CpuQuota": 0,
            "CpuRealtimePeriod": 0,
            "CpuRealtimeRuntime": 0,
            "CpusetCpus": "",
            "CpusetMems": "",
            "Devices": [],
            "DeviceCgroupRules": null,
            "DiskQuota": 0,
            "KernelMemory": 0,
            "MemoryReservation": 0,
            "MemorySwap": 8589934592,
            "MemorySwappiness": -1,
            "OomKillDisable": false,
            "PidsLimit": 0,
            "Ulimits": null,
            "CpuCount": 0,
            "CpuPercent": 0,
            "IOMaximumIOps": 0,
            "IOMaximumBandwidth": 0
        },
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/bf2b1c63a0862bcc09c3a126e41b6658b60178ade943a8844780a24b01cf2f7c-init/diff:/var/lib/docker/overlay2/be89c1495150690fd934ba56411d144f7de43d06d268fe4b2d0e12552bab6b31/diff:/var/lib/docker/overlay2/d222b270a29034ff81603a80776dd05a259369dcb721515bb2ad08039e9327f1/diff:/var/lib/docker/overlay2/0f1c10959b14c67f2776cd5696a8281f514a42505ec2e0aab759f8543f0e6eed/diff:/var/lib/docker/overlay2/adfec4e3f9b8b1252520f8a56ee27d4cf5fb3f3a01dae344c9932f5bda7d732f/diff:/var/lib/docker/overlay2/e350f5d2bcc4252a5f067eb72b5ad65c6c620178347373736e1308c35e0a17d3/diff:/var/lib/docker/overlay2/2ed71b40ecf304222f071b0ccfc14f10dbd7566de01d16ff80169dea80dd72d4/diff:/var/lib/docker/overlay2/1b20e86eb201191ce6fd4d904f1bfd95fe3423bd6d083cd763c7995a518c9e23/diff:/var/lib/docker/overlay2/35c6c2859ec66d741643c7f9ff47e8513504e7560ea63369f671b305a66edaa1/diff:/var/lib/docker/overlay2/50e277363a9f73f105e6a60edb47c257b04f8383e4575e0cb67e6d628148c305/diff:/var/lib/docker/overlay2/3163f8c2fc0c94623b3390178b5d9de9938d2e9399df0f0341384f8d0fc75761/diff:/var/lib/docker/overlay2/1dc179342c7786f88e98fd68f72dcb187d8524b203ce6122158cf68d94df3a3a/diff:/var/lib/docker/overlay2/f3f749adb1ea12915a0bc1b6258682cbf7571288656325152784b02039b56fd1/diff:/var/lib/docker/overlay2/deb0c7c423d5f685db5213536810c71fae89fee553d830f6a7cfba3b29853097/diff",
                "MergedDir": "/var/lib/docker/overlay2/bf2b1c63a0862bcc09c3a126e41b6658b60178ade943a8844780a24b01cf2f7c/merged",
                "UpperDir": "/var/lib/docker/overlay2/bf2b1c63a0862bcc09c3a126e41b6658b60178ade943a8844780a24b01cf2f7c/diff",
                "WorkDir": "/var/lib/docker/overlay2/bf2b1c63a0862bcc09c3a126e41b6658b60178ade943a8844780a24b01cf2f7c/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [
            {
                "Name": "46705245e5a0a71c14665c843a34ee349f19b4cc0efeed655e9b3575b0b83a3d",
                "Source": "/var/lib/docker/volumes/46705245e5a0a71c14665c843a34ee349f19b4cc0efeed655e9b3575b0b83a3d/_data",
                "Destination": "/home/jenkins/.jenkins",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],
        "Config": {
            "Hostname": "097e51587d94",
            "Domainname": "",
            "User": "10000:10000",
            "AttachStdin": false,
            "AttachStdout": true,
            "AttachStderr": true,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "TMPDIR=/home/jenkins/.jenkins/.tmp",
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "NPM_CONFIG_LOGLEVEL=info",
                "NODE_VERSION=7.10.0",
                "YARN_VERSION=0.24.4"
            ],
            "Cmd": [
                "/trampoline",
                "wait"
            ],
            "Image": "jenkins-mongo-3.4",
            "Volumes": null,
            "WorkingDir": "/home/jenkins/.jenkins",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "maintainer": "zhaoyi0113@gmail.com"
            }
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {},
            "SandboxKey": "",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "",
            "Gateway": "",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "",
            "IPPrefixLen": 0,
            "IPv6Gateway": "",
            "MacAddress": "",
            "Networks": {}
        }
    }
]

最佳答案

不要将mongod进程用作pid1，而应使用supervisor。

因此，请使用 super 用户启动mongodb(如果根本需要它，并且您的测试本身并没有真正启动它)。

这样，您的测试可以使用以下命令轻松启动/停止该过程:
supervisorctl stop mongod，然后使用supervisorctl start mongod重新启动

停止mongod服务不会退出容器，因为 super 用户是pid1

如果您希望测试专门使用二进制文件启动并且不需要pid跟踪和提示，则可以使用busyscript作为pid，然后使用测试在容器中启动mongod进程。

繁忙的脚本看起来像这样

#!/bin/sh
#set -x

pid=0

# SIGTERM-handler
term_handler() {
  if [ $pid -ne 0 ]; then
    kill -SIGTERM "$pid"
    wait "$pid"
  fi
  exit 143; # 128 + 15 -- SIGTERM
}

# setup handlers
# on callback, kill the last background process, which is `tail -f /dev/null` and execute the specified handler
trap 'kill ${!}; term_handler' SIGTERM

echo "Started DW php code"
# wait forever
while true
do
  tail -f /dev/null & wait ${!}
done

或者，对容器使用更多的精力，但可能会很笨拙。一个是带有主机安装的Docker套接字的测试运行程序。这将运行测试并启动mongod contaienr并按您的意愿进行杀死，因此基本上，该测试将杀死/ rm mongod容器而不是进程本身-然后再次启动容器。

关于docker - 在Docker容器中杀死一个 fork 的进程，使该容器在Jenkins docker slave插件上退出，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45362001/

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