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Read timeout connecting to server on Docker container

I’m trying to connect to a DB/2 container (image: ibmcom/db2) but it gives me a read timeout error. The host OS is Windows 10. I can see the port (50000) in the Windows PowerShell prompt, but it gives me a read timeout.

I also started an SSH server in that container and could log into it from within the container, but not outside of it. When connecting from outside, I got the same read timeout message. I do not feel this is a db2 issue.

I’m using Win 10, WSL2. Docker version 20.10.7, build f0df350.

I start the container by doing:

docker run -itd --name mydb-db2 \
                --privileged=true \
		-p 50000:50000 \
		-e LICENSE=accept \
		-e B2INSTANCE=db2inst1 \
		-e DB2INST1_PASSWORD=<mypassword> \
		-e DBNAME=MYDB \
		-e TO_CREATE_SAMPLEDB=false \
		-v db2:/database \
		ibmcom/db2 

Netstat evidence:

C:\Software>netstat /a /n |grep 50000
  TCP    0.0.0.0:50000          0.0.0.0:0              LISTENING
  TCP    [::]:50000             [::]:0                 LISTENING

Attempt to connect to jdbc:db2://localhost:50000/MYDB
on host system results in “Read timed out. ERRORCODE=-4499, SQLSTATE=08001”

Docker container status:

~/projects-new/db2$ docker container ls
CONTAINER ID   IMAGE        COMMAND                  CREATED      STATUS          PORTS
                                              NAMES
110aa19976dd   ibmcom/db2   "/var/db2_setup/lib/…"   2 days ago   Up 28 minutes   22/tcp, 55000/tcp, 60006-60007/tcp, 0.0.0.0:50000->50000/tcp, :::50000->50000/tcp   mydb-db2

Inspection of container:

~/projects-new/db2$ docker container inspect 110aa
[
    {
        "Id": "110aa19976ddb53d16eac9376476f974fee8e9c699da3f76c1e2e13c444655c2",
        "Created": "2021-07-16T04:10:51.1247765Z",
        "Path": "/var/db2_setup/lib/setup_db2_instance.sh",
        "Args": [],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 5459,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2021-07-18T03:56:45.0493495Z",
            "FinishedAt": "2021-07-18T03:54:18.4239523Z"
        },
        "Image": "sha256:a6a5ee354fb1242a75d508982041cd48883f3fe7c9c9b485be0da6c0ebd44a39",
        "ResolvConfPath": "/var/lib/docker/containers/110aa19976ddb53d16eac9376476f974fee8e9c699da3f76c1e2e13c444655c2/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/110aa19976ddb53d16eac9376476f974fee8e9c699da3f76c1e2e13c444655c2/hostname",
        "HostsPath": "/var/lib/docker/containers/110aa19976ddb53d16eac9376476f974fee8e9c699da3f76c1e2e13c444655c2/hosts",
        "LogPath": "/var/lib/docker/containers/110aa19976ddb53d16eac9376476f974fee8e9c699da3f76c1e2e13c444655c2/110aa19976ddb53d16eac9376476f974fee8e9c699da3f76c1e2e13c444655c2-json.log",
        "Name": "/mydb-db2",
        "RestartCount": 0,
        "Driver": "overlay2",
        "Platform": "linux",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "",
        "ExecIDs": null,
        "HostConfig": {
            "Binds": [
                "db2:/database"
            ],
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "json-file",
                "Config": {}
            },
            "NetworkMode": "default",
            "PortBindings": {
                "50000/tcp": [
                    {
                        "HostIp": "",
                        "HostPort": "50000"
                    }
                ]
            },
            "RestartPolicy": {
                "Name": "no",
                "MaximumRetryCount": 0
            },
            "AutoRemove": false,
            "VolumeDriver": "",
            "VolumesFrom": null,
            "CapAdd": null,
            "CapDrop": null,
            "CgroupnsMode": "host",
            "Dns": [],
            "DnsOptions": [],
            "DnsSearch": [],
            "ExtraHosts": null,
            "GroupAdd": null,
            "IpcMode": "private",
            "Cgroup": "",
            "Links": null,
            "OomScoreAdj": 0,
            "PidMode": "",
            "Privileged": true,
            "PublishAllPorts": false,
            "ReadonlyRootfs": false,
            "SecurityOpt": [
                "label=disable"
            ],
            "UTSMode": "",
            "UsernsMode": "",
            "ShmSize": 67108864,
            "Runtime": "runc",
            "ConsoleSize": [
                0,
                0
            ],
            "Isolation": "",
            "CpuShares": 0,
            "Memory": 0,
            "NanoCpus": 0,
            "CgroupParent": "",
            "BlkioWeight": 0,
            "BlkioWeightDevice": [],
            "BlkioDeviceReadBps": null,
            "BlkioDeviceWriteBps": null,
            "BlkioDeviceReadIOps": null,
            "BlkioDeviceWriteIOps": null,
            "CpuPeriod": 0,
            "CpuQuota": 0,
            "CpuRealtimePeriod": 0,
            "CpuRealtimeRuntime": 0,
            "CpusetCpus": "",
            "CpusetMems": "",
            "Devices": [],
            "DeviceCgroupRules": null,
            "DeviceRequests": null,
            "KernelMemory": 0,
            "KernelMemoryTCP": 0,
            "MemoryReservation": 0,
            "MemorySwap": 0,
            "MemorySwappiness": null,
            "OomKillDisable": false,
            "PidsLimit": null,
            "Ulimits": null,
            "CpuCount": 0,
            "CpuPercent": 0,
            "IOMaximumIOps": 0,
            "IOMaximumBandwidth": 0,
            "MaskedPaths": null,
            "ReadonlyPaths": null
        },
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/b6ecb6d5e949ab8e58d9238e34878a563a45f5045d57c684e5a08b6ec833ebb4-init/diff:/var/lib/docker/overlay2/6cf25bf1ac29315c3832316ef32b1cae8cf1ed6e71e4ddd9d08ab5566f81da9e/diff:/var/lib/docker/overlay2/76ca13571a6d253356b48ac20b408d33f80c5e6b429c132533e60c7578e99fb3/diff:/var/lib/docker/overlay2/e1a78196ef6f70929701e708904cb2696189c37a40839a0f20407148d2d90f1d/diff:/var/lib/docker/overlay2/efa2b4a3bc7e7411a671f05ad9121a4bb609452560b5f73d4b765e8519bfa36d/diff:/var/lib/docker/overlay2/933425814e17216adcfcac390e789c6dfc8ada12ded902db2ca9a542a5ff555c/diff:/var/lib/docker/overlay2/2ec2f25d859b77fd93a16468e40de569c41b35055c58277ad97d839cb33a01ac/diff:/var/lib/docker/overlay2/62aeaecc9fea67541671d95f691a2d8ddc9076ee0ae3bc96cd3b030a3ecc663b/diff:/var/lib/docker/overlay2/f04ce4e91dedc0c14073e43734ca252a7c0bd6f6ed9ab89f77d6797f72312f2d/diff:/var/lib/docker/overlay2/21b929e594040a64ffb0cd2c8bd4d3d7f630a3ec3dd79e8157c41c0d9783faa6/diff:/var/lib/docker/overlay2/c5e235fc2e9dc254394bcae472264b133530f5dfbb285cfe5f0ba0dac26ce4c4/diff:/var/lib/docker/overlay2/8f68a8bb1e9ca565aa1d8debc221bb498512a6ed24cc07bcf3ef07c8c42e045f/diff:/var/lib/docker/overlay2/745a0aa01d1a904ce08c22d07be527cdb39da0c37b87a66a57062cc307ca4d4c/diff:/var/lib/docker/overlay2/f0a873fda45d17a036833dd0dc9362f02b0ab00c590f23bf38ba59d06c624272/diff",
                "MergedDir": "/var/lib/docker/overlay2/b6ecb6d5e949ab8e58d9238e34878a563a45f5045d57c684e5a08b6ec833ebb4/merged",
                "UpperDir": "/var/lib/docker/overlay2/b6ecb6d5e949ab8e58d9238e34878a563a45f5045d57c684e5a08b6ec833ebb4/diff",
                "WorkDir": "/var/lib/docker/overlay2/b6ecb6d5e949ab8e58d9238e34878a563a45f5045d57c684e5a08b6ec833ebb4/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [
            {
                "Type": "volume",
                "Name": "db2",
                "Source": "/var/lib/docker/volumes/db2/_data",
                "Destination": "/database",
                "Driver": "local",
                "Mode": "z",
                "RW": true,
                "Propagation": ""
            },
            {
                "Type": "volume",
                "Name": "47c06e44c75f70947a907a0972924536761f70f15971459e8be6015b29e2e48c",
                "Source": "/var/lib/docker/volumes/47c06e44c75f70947a907a0972924536761f70f15971459e8be6015b29e2e48c/_data",
                "Destination": "/hadr",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],
        "Config": {
            "Hostname": "110aa19976dd",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "22/tcp": {},
                "50000/tcp": {},
                "55000/tcp": {},
                "60006/tcp": {},
                "60007/tcp": {}
            },
            "Tty": true,
            "OpenStdin": true,
            "StdinOnce": false,
            "Env": [
                "LICENSE=accept",
                "B2INSTANCE=db2inst1",
                "DB2INST1_PASSWORD=<mypassword>",
                "DBNAME=BLUECOST",
                "TO_CREATE_SAMPLEDB=false",
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "container=oci",
                "STORAGE_DIR=/database",
                "HADR_SHARED_DIR=/hadr",
                "DBPORT=50000",
                "TSPORT=55000",
                "SETUPDIR=/var/db2_setup",
                "SETUPAREA=/tmp/setup",
                "NOTVISIBLE=in users profile",
                "LICENSE_NAME=db2dec.lic"
            ],
            "Cmd": null,
            "Image": "ibmcom/db2",
            "Volumes": {
                "/database": {},
                "/hadr": {}
            },
            "WorkingDir": "",
            "Entrypoint": [
                "/var/db2_setup/lib/setup_db2_instance.sh"
            ],
            "OnBuild": null,
            "Labels": {
                "architecture": "x86_64",
                "build-date": "2021-06-01T05:31:45.840349",
                "com.redhat.build-host": "cpt-1007.osbs.prod.upshift.rdu2.redhat.com",
                "com.redhat.component": "ubi7-container",
                "com.redhat.license_terms": "https://www.redhat.com/en/about/red-hat-end-user-license-agreements#UBI",
                "description": "The Universal Base Image is designed and engineered to be the base layer for all of your containerized applications, middleware and utilities. This base image is freely redistributable, but Red Hat only supports Red Hat technologies through subscriptions for Red Hat products. This image is maintained by Red Hat and updated regularly.",
                "desktop.docker.io/wsl-distro": "Ubuntu-20.04",
                "distribution-scope": "public",
                "io.k8s.description": "The Universal Base Image is designed and engineered to be the base layer for all of your containerized applications, middleware and utilities. This base image is freely redistributable, but Red Hat only supports Red Hat technologies through subscriptions for Red Hat products. This image is maintained by Red Hat and updated regularly.",
                "io.k8s.display-name": "Red Hat Universal Base Image 7",
                "io.openshift.tags": "base rhel7",
                "name": "ubi7",
                "release": "405",
                "summary": "Provides the latest release of the Red Hat Universal Base Image 7.",
                "url": "https://access.redhat.com/containers/#/registry.access.redhat.com/ubi7/images/7.9-405",
                "vcs-ref": "a4e710a688a6374670ecdd56637c3f683d11cbe3",
                "vcs-type": "git",
                "vendor": "Red Hat, Inc.",
                "version": "7.9"
            }
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "570856178f99951c7cdfccc638a3404f906a7a89905ba9d39181cd9310f4380b",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {
                "22/tcp": null,
                "50000/tcp": [
                    {
                        "HostIp": "0.0.0.0",
                        "HostPort": "50000"
                    },
                    {
                        "HostIp": "::",
                        "HostPort": "50000"
                    }
                ],
                "55000/tcp": null,
                "60006/tcp": null,
                "60007/tcp": null
            },
            "SandboxKey": "/var/run/docker/netns/570856178f99",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "a50d8643af88c0d677a9dc2d889f20ab909f46707bb7bd0f8168666b18d1b414",
            "Gateway": "172.17.0.1",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "172.17.0.2",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
            "MacAddress": "02:42:ac:11:00:02",
            "Networks": {
                "bridge": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": null,
                    "NetworkID": "408fe3a7130f9791810b8668b60b7f90478f4673f79270539044362e8c12d88f",
                    "EndpointID": "a50d8643af88c0d677a9dc2d889f20ab909f46707bb7bd0f8168666b18d1b414",
                    "Gateway": "172.17.0.1",
                    "IPAddress": "172.17.0.2",
                    "IPPrefixLen": 16,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "02:42:ac:11:00:02",
                    "DriverOpts": null
                }
            }
        }
    }
]

I didn’t see the db2 container listed. These are my networks:

C:\Software>docker network ls
NETWORK ID     NAME                             DRIVER    SCOPE
408fe3a7130f   bridge                           bridge    local
38fc17e8e6f1   cirrus-ssc-file-sender_default   bridge    local
1668ab71959f   host                             host      local
4bf4f6b3a57e   minikube                         bridge    local
e07fc0032414   none                             null      local

Instead, I found it on the bridge network.

I’m not trying to do anything fancy. I’d really rather it run on the same network host. If the host system can “see” the exposed port of 50000 via Netstat, wouldn’t that mean it’s not a firewall issue?