Not able to pass arguments to entrypoint in buildah #2209

akshatsharma4 · 2020-03-09T10:46:57Z

Hi,
I am not able to pass arguments to the entrypoint while building a buildah image(logstash).

Below is how I was passing arguments to my entrypoint in Dockerfile:

ENTRYPOINT ["/usr/share/logstash/config/logstash-entrypoint.sh"]
CMD ["--path.settings", "/etc/logstash/"]
CMD ["-f", "/usr/share/logstash/pipeline/"]

The same thing I tried to do in buildah.sh as:
buildah config --entrypoint '["/usr/share/logstash/config/logstash-entrypoint.sh","--path.settings /etc/logstash/","-f /usr/share/logstash/pipeline/"]' $container

These arguments that are passed to entrypoint is not being read in buildah while it was working as expected in Dockerfile. I am not sure if there is any syntactical error here but I am not facing any problem while building the image.

Kindly help me resolve this.

Best Regards,
Akshat

The text was updated successfully, but these errors were encountered:

TomSweeneyRedHat · 2020-03-09T18:29:43Z

@akshatsharma4 Can I ask for a bit more information please? Can you tell me:

Buildah Version
Any error(s) when the bud or config commands run?
Can you try running the bud and/or config command again with the debug option? buildah --debug bud ... If so please post the output.
Does the image get created? If so can you add the output for buildah inspect {image}

Thanks!

akshatsharma4 · 2020-03-10T10:13:38Z

(TomSweeneyRedHat) edited this reply slightly to make it a bit more readable in the GitHub interface)
@TomSweeneyRedHat Thank you for the response. Here are the details you asked for:

buildah version: 1.9.0
Any error(s) when the bud or config commands run? -----> I am running those images in my helm chart, there are no errors while runnig logstash chart, it takes all default values and runs just fine. The problem is when I try to increase pipeline.workers by changing that value in my chart. These increased values are not being used and I suspect, it is because the arguments passed to entrypoint is not being considered. Please have a look at the entrypoint command below:
buildah config --entrypoint '["/usr/share/logstash/config/logstash-entrypoint.sh","--path.settings /etc/logstash/","-f /usr/share/logstash/pipeline/"]' $container
Can you try running the bud and/or config command again with the debug option? buildah --debug bud ... If so please post the output. -----> I am not familiar with bud commands. As I mentioned, I am runnig this image in a helm chart, could you please tell me how to debug in kubernetes environment ?
Does the image get created? If so can you add the output for buildah inspect {image} ----->
Yes, the image is getting created and I am able to run it in my helm chart as well.
output of buildah inspect {image}:

{
    "Type": "buildah 0.0.1",
    "FromImage": "localhost/elk_l:7.0.1-19.12.0",
    "FromImageID": "6bfd3ad245f393c2b45a56e78be4e54761c05336d8506d907efc3bbbb704ce76",
    "Config": "{\"created\":\"2020-03-10T08:57:10.890965504Z\",\"architecture\":\"amd64\",\"os\":\"linux\",\"config\":{\"User\":\"1000\",\"ExposedPorts\":{\"5044\":{},\"9600\":{}},\"Env\":[\"JAVA_HOME=/etc/alternatives/jre_openjdk/\",\"PATH=/usr/share/logstash/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin\",\"LANG=en_US.UTF-8\",\"LC_ALL=en_US.UTF-8\",\"LS_JAVA_OPTS=-Djava.security.egd=file:/dev/./urandom\",\"JARS_SKIP=true\",\"NODE_NAME=ls_node\",\"BATCH_SIZE=125\",\"BATCH_DELAY=5\",\"http_proxy=\",\"https_proxy=\",\"HTTP_PROXY=\",\"HTTPS_PROXY=\",\"JRUBY_OPTS=\"],\"Entrypoint\":[\"/usr/share/logstash/config/logstash-entrypoint.sh\",\"--path.settings /etc/logstash/\",\"-f /usr/share/logstash/pipeline/\"],\"Labels\":{\"BASE_IMAGE\":\"centos:7.7\",\"FROM\":\"scratch\",\"IMAGE_NAME\":\"CENTOS_JAVA11_IMAGE_MICRO\",\"JAVA_RELEASE\":\"11.0.5\",\"MAINTAINER\":\"*************\"}},\"rootfs\":{\"type\":\"layers\",\"diff_ids\":[\"sha256:e4009cf2b5660d3a84cbf2c00e1cc8cd21262220d8c6fdb12786048419618826\",\"sha256:f31d879be8e78a55cfe3b5b59bdca6be926dea1bbd8079f5ca10e8af68f5c576\",\"sha256:b7c6b2705b5868124315c2f516200997325ad72b5661f67a9b8d2da724b1a01e\"]},\"history\":[{\"created\":\"2019-12-16T02:56:02.534822341Z\"},{\"created\":\"2019-12-16T11:01:10.835212766Z\"},{\"created\":\"2020-03-10T08:57:10.890965504Z\",\"created_by\":\"/bin/sh\"}]}",
    "Manifest": "{\"schemaVersion\":2,\"config\":{\"mediaType\":\"application/vnd.oci.image.config.v1+json\",\"digest\":\"sha256:6bfd3ad245f393c2b45a56e78be4e54761c05336d8506d907efc3bbbb704ce76\",\"size\":1253},\"layers\":[{\"mediaType\":\"application/vnd.oci.image.layer.v1.tar\",\"digest\":\"sha256:e4009cf2b5660d3a84cbf2c00e1cc8cd21262220d8c6fdb12786048419618826\",\"size\":58750464},{\"mediaType\":\"application/vnd.oci.image.layer.v1.tar\",\"digest\":\"sha256:f31d879be8e78a55cfe3b5b59bdca6be926dea1bbd8079f5ca10e8af68f5c576\",\"size\":672445952},{\"mediaType\":\"application/vnd.oci.image.layer.v1.tar\",\"digest\":\"sha256:b7c6b2705b5868124315c2f516200997325ad72b5661f67a9b8d2da724b1a01e\",\"size\":396231168}]}",
    "Container": "",
    "ContainerID": "",
    "MountPoint": "",
    "ProcessLabel": "",
    "MountLabel": "",
    "ImageAnnotations": null,
    "ImageCreatedBy": "",
    "OCIv1": {
        "created": "2020-03-10T08:57:10.890965504Z",
        "architecture": "amd64",
        "os": "linux",
        "config": {
            "User": "1000",
            "ExposedPorts": {
                "5044": {},
                "9600": {}
            },
            "Env": [
                "JAVA_HOME=/etc/alternatives/jre_openjdk/",
                "PATH=/usr/share/logstash/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin",
                "LANG=en_US.UTF-8",
                "LC_ALL=en_US.UTF-8",
                "LS_JAVA_OPTS=-Djava.security.egd=file:/dev/./urandom",
                "JARS_SKIP=true",
                "NODE_NAME=ls_node",
                "BATCH_SIZE=125",
                "BATCH_DELAY=5",
                "http_proxy=",
                "https_proxy=",
                "HTTP_PROXY=",
                "HTTPS_PROXY=",
                "JRUBY_OPTS="
            ],
            "Entrypoint": [
                "/usr/share/logstash/config/logstash-entrypoint.sh",
                "--path.settings /etc/logstash/",
                "-f /usr/share/logstash/pipeline/"
            ],
            "Labels": {
                "BASE_IMAGE": "centos:7.7",
                "FROM": "scratch",
                "IMAGE_NAME": "centos:7.7",
                "JAVA_RELEASE": "11.0.5",
                "MAINTAINER": "*************"
            }
        },
        "rootfs": {
            "type": "layers",
            "diff_ids": [
                "sha256:e4009cf2b5660d3a84cbf2c00e1cc8cd21262220d8c6fdb12786048419618826",
                "sha256:f31d879be8e78a55cfe3b5b59bdca6be926dea1bbd8079f5ca10e8af68f5c576",
                "sha256:b7c6b2705b5868124315c2f516200997325ad72b5661f67a9b8d2da724b1a01e"
            ]
        },
        "history": [
            {
                "created": "2019-12-16T02:56:02.534822341Z"
            },
            {
                "created": "2019-12-16T11:01:10.835212766Z"
            },
            {
                "created": "2020-03-10T08:57:10.890965504Z",
                "created_by": "/bin/sh"
            }
        ]
    },
    "Docker": {
        "created": "2020-03-10T08:57:10.890965504Z",
        "container_config": {
            "Hostname": "",
            "Domainname": "",
            "User": "1000",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "5044": {},
                "9600": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "JAVA_HOME=/etc/alternatives/jre_openjdk/",
                "PATH=/usr/share/logstash/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin",
                "LANG=en_US.UTF-8",
                "LC_ALL=en_US.UTF-8",
                "LS_JAVA_OPTS=-Djava.security.egd=file:/dev/./urandom",
                "JARS_SKIP=true",
                "NODE_NAME=ls_node",
                "BATCH_SIZE=125",
                "BATCH_DELAY=5",
                "http_proxy=",
                "https_proxy=",
                "HTTP_PROXY=",
                "HTTPS_PROXY=",
                "JRUBY_OPTS="
            ],
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": [
                "/usr/share/logstash/config/logstash-entrypoint.sh",
                "--path.settings /etc/logstash/",
                "-f /usr/share/logstash/pipeline/"
            ],
            "OnBuild": null,
            "Labels": {
                "BASE_IMAGE": "centos:7.7",
                "FROM": "scratch",
                "IMAGE_NAME": "CENTOS_JAVA11_IMAGE_MICRO",
                "JAVA_RELEASE": "11.0.5",
                "MAINTAINER": "***********"
            }
        },
        "config": {
            "Hostname": "",
            "Domainname": "",
            "User": "1000",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "5044": {},
                "9600": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "JAVA_HOME=/etc/alternatives/jre_openjdk/",
                "PATH=/usr/share/logstash/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin",
                "LANG=en_US.UTF-8",
                "LC_ALL=en_US.UTF-8",
                "LS_JAVA_OPTS=-Djava.security.egd=file:/dev/./urandom",
                "JARS_SKIP=true",
                "NODE_NAME=ls_node",
                "BATCH_SIZE=125",
                "BATCH_DELAY=5",
                "http_proxy=",
                "https_proxy=",
                "HTTP_PROXY=",
                "HTTPS_PROXY=",
                "JRUBY_OPTS="
            ],
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": [
                "/usr/share/logstash/config/logstash-entrypoint.sh",
                "--path.settings /etc/logstash/",
                "-f /usr/share/logstash/pipeline/"
            ],
            "OnBuild": null,
            "Labels": {
                "BASE_IMAGE": "centos:7.7",
                "FROM": "scratch",
                "IMAGE_NAME": "CENTOS_JAVA11_IMAGE_MICRO",
                "JAVA_RELEASE": "11.0.5",
                "MAINTAINER": "*************"
            }
        },
        "architecture": "amd64",
        "os": "linux",
        "rootfs": {
            "type": "layers",
            "diff_ids": [
                "sha256:e4009cf2b5660d3a84cbf2c00e1cc8cd21262220d8c6fdb12786048419618826",
                "sha256:f31d879be8e78a55cfe3b5b59bdca6be926dea1bbd8079f5ca10e8af68f5c576",
                "sha256:b7c6b2705b5868124315c2f516200997325ad72b5661f67a9b8d2da724b1a01e"
            ]
        },
        "history": [
            {
                "created": "2019-12-16T02:56:02.534822341Z"
            },
            {
                "created": "2019-12-16T11:01:10.835212766Z"
            },
            {
                "created": "2020-03-10T08:57:10.890965504Z",
                "created_by": "/bin/sh"
            }
        ]
    },
    "DefaultMountsFilePath": "",
    "Isolation": "IsolationDefault",
    "NamespaceOptions": [
        {
            "Name": "cgroup",
            "Host": true,
            "Path": ""
        },
        {
            "Name": "ipc",
            "Host": false,
            "Path": ""
        },
        {
            "Name": "mount",
            "Host": false,
            "Path": ""
        },
        {
            "Name": "network",
            "Host": false,
            "Path": ""
        },
        {
            "Name": "pid",
            "Host": false,
            "Path": ""
        },
        {
            "Name": "user",
            "Host": true,
            "Path": ""
        },
        {
            "Name": "uts",
            "Host": false,
            "Path": ""
        }
    ],
    "ConfigureNetwork": "NetworkDefault",
    "CNIPluginPath": "",
    "CNIConfigDir": "",
    "IDMappingOptions": {
        "HostUIDMapping": true,
        "HostGIDMapping": true,
        "UIDMap": [],
        "GIDMap": []
    },
    "DefaultCapabilities": [
        "CAP_AUDIT_WRITE",
        "CAP_CHOWN",
        "CAP_DAC_OVERRIDE",
        "CAP_FOWNER",
        "CAP_FSETID",
        "CAP_KILL",
        "CAP_MKNOD",
        "CAP_NET_BIND_SERVICE",
        "CAP_SETFCAP",
        "CAP_SETGID",
        "CAP_SETPCAP",
        "CAP_SETUID",
        "CAP_SYS_CHROOT"
    ],
    "AddCapabilities": [],
    "DropCapabilities": [],
    "History": [
        {
            "created": "2019-12-16T02:56:02.534822341Z"
        },
        {
            "created": "2019-12-16T11:01:10.835212766Z"
        },
        {
            "created": "2020-03-10T08:57:10.890965504Z",
            "created_by": "/bin/sh"
        },
        {
            "created": "2020-03-10T09:30:37.641357985Z"
        }
    ]
}

Best Regards,
Akshat

TomSweeneyRedHat · 2020-03-10T13:54:55Z

@akshatsharma4 thanks for the info. Honestly, I'm not sure how to pull off the debug trick in your environment. However, I have a theory on the issue. It looks like your entrypoint is being set to:

"/usr/share/logstash/config/logstash-entrypoint.sh",
                "--path.settings /etc/logstash/",
                "-f /usr/share/logstash/pipeline/"

I think the last two entries should instead be in the "Cmd" field. Can you try this slightly modified config command please?

buildah config --entrypoint "/usr/share/logstash/config/logstash-entrypoint.sh" --cmd "--path.settings /etc/logstash/ -f /usr/share/logstash/pipeline/" $container

akshatsharma4 · 2020-03-11T13:18:56Z

@TomSweeneyRedHat
It worked!
I had to make a couple of more changes due to this modification but that is about logstash's configuration.
Really appreciate all your help!

Best Regards,
Akshat

TomSweeneyRedHat · 2020-03-11T14:23:10Z

@akshatsharma4 super! Glad we got it figured out.

akshatsharma4 · 2020-03-13T06:25:23Z

@TomSweeneyRedHat
Looks like buildah config --entrypoint "/usr/share/logstash/config/logstash-entrypoint.sh" --cmd "--path.settings /etc/logstash/ -f /usr/share/logstash/pipeline/" $container is not the way to go.

As I mentioned in my previous comment, I had to make a couple of changes after passing cmd in entrypoint, so just out of curiosity, I logged into the logstash pod and ran ps -ef to check which are the scripts Logstash is using to start.
I found, Logstash process was only runnig using /usr/share/logstash/config/logstash-entrypoint.sh and there was no argument passed to entrypoint. which should have not been the case if the argument to entrypoint was considered. This concluded that the extra changes that I had make was because of this.

Basically, my Dockerfile script itself was not correct, which created all the confusion. Seems like, if you pass two different CMD to ENTRYPOINT in Dockerfile, only the last one will be considered. In my Dockerfile I had passed like this:

ENTRYPOINT ["/usr/share/logstash/config/logstash-entrypoint.sh"]
CMD ["--path.settings", "/etc/logstash/"]
CMD ["-f", "/usr/share/logstash/pipeline/"]

Here CMD ["-f", "/usr/share/logstash/pipeline/"] was overriding CMD ["--path.settings", "/etc/logstash/"].
So in case of my buildah script, had to pass only second CMD as an argument to my entrypoint which got it working without any extra changes in the script.

Also, --cmd should not be passed with --entrypoint in buildah config. If you want to pass an argument to entrypoint, it should be passed as:
buildah config --entrypoint '["/usr/share/logstash/config/logstash-entrypoint.sh","-f /usr/share/logstash/pipeline/"]' $container, basically as a comma separated list.
You can refer this link for more details.

Please correct me if any of my understanding is wrong.

Best Regards,
Akshat

TomSweeneyRedHat · 2020-03-13T16:00:36Z

@akshatsharma4 Thanks for the feedback, testing, and status. Honestly, I don't know if your understanding is wrong or not offhand, it looks very reasonable and I'll defer to @nalind or others. We'll definitely take a deeper look though thanks to your findings.

AstraLuma · 2020-05-05T19:38:41Z

Is this possibly related to containers/podman#4809 ?

rhatdan · 2020-05-07T20:26:20Z

Looks possible. Could you check on newer versions?

AstraLuma · 2020-05-08T02:21:03Z

Hm. So I want back and looked at my own work. When I dug into this in early February, --entrypoint would accept a JSON array, but --cmd took "shellwords".

I don't think this is the same as the libpod bug above (which was a data schema bug).

To be honest, I'm not sure this is open? You can express multi-argument entrypoint and cmd to buildah config, per the OCI spec. (It says they're both optional arrays of strings.)

tbh, I'm not sure why this bug is open.

akshatsharma4 closed this as completed Mar 11, 2020

TomSweeneyRedHat reopened this Mar 13, 2020

rhatdan closed this as completed Aug 6, 2020

github-actions bot added the locked - please file new issue/PR label Sep 10, 2023

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Not able to pass arguments to entrypoint in buildah #2209

Not able to pass arguments to entrypoint in buildah #2209

akshatsharma4 commented Mar 9, 2020

TomSweeneyRedHat commented Mar 9, 2020

akshatsharma4 commented Mar 10, 2020 •

edited by TomSweeneyRedHat

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akshatsharma4 commented Mar 11, 2020

TomSweeneyRedHat commented Mar 11, 2020

akshatsharma4 commented Mar 13, 2020 •

edited

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TomSweeneyRedHat commented Mar 13, 2020

AstraLuma commented May 5, 2020

rhatdan commented May 7, 2020

AstraLuma commented May 8, 2020

Not able to pass arguments to entrypoint in buildah #2209

Not able to pass arguments to entrypoint in buildah #2209

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akshatsharma4 commented Mar 9, 2020

TomSweeneyRedHat commented Mar 9, 2020

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akshatsharma4 commented Mar 11, 2020

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akshatsharma4 commented Mar 10, 2020 •

edited by TomSweeneyRedHat

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