Template:Docker/Troubleshooting
From charlesreid1
Contents
Troubleshooting Running Processes
Troubleshooting Stopped Processes
Attaching to a running container
To attach to a running container, use docker exec and pass it bash:
sudo docker exec -i -t happy_mongo /bin/bash
Container starts and immediately stops
You can try running an interactive shell by adding the -it flag to the container you are running, and giving it a command (a shell).
For example, suppose we want to run the ubuntu container, and get a shell: we can just add the -it flag before the name of the image, and give it a command to run.
$ docker run -it ubuntu /bin/bash root@3c554e350f70:/#
The -i flag opens STDIN for the container, allowing us to send information to the container, and -t creates a tty terminal so that the shell has something to communicate with (send text to).
Now we have a regular old shell on a Ubuntu box:
root@3c554e350f70:/# ls / bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
Adding the -it and a shell to a container that is immediately dying can help troubleshoot what's going on - you can check logs, running processes, etc.
Inspecting container process
Inspecting a container process:
$ docker inspect intrepid_hawking
[
{
"Id": "1912d9ff49fd270795954979264e7819311c63309cef3861a9477bb2a7f59540",
"Created": "2017-09-23T19:18:31.706170871Z",
"Path": "python2",
"Args": [],
"State": {
"Status": "exited",
"Running": false,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 0,
"ExitCode": 0,
"Error": "",
"StartedAt": "2017-09-23T19:18:32.415935613Z",
"FinishedAt": "2017-09-23T19:18:32.529070289Z"
},
"Image": "sha256:80947d6d85ec25656b97d764796d383f9cf7002a5dc695867e7abcc002c257ec",
"ResolvConfPath": "/var/lib/docker/containers/1912d9ff49fd270795954979264e7819311c63309cef3861a9477bb2a7f59540/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/1912d9ff49fd270795954979264e7819311c63309cef3861a9477bb2a7f59540/hostname",
"HostsPath": "/var/lib/docker/containers/1912d9ff49fd270795954979264e7819311c63309cef3861a9477bb2a7f59540/hosts",
"LogPath": "/var/lib/docker/containers/1912d9ff49fd270795954979264e7819311c63309cef3861a9477bb2a7f59540/1912d9ff49fd270795954979264e7819311c63309cef3861a9477bb2a7f59540-json.log",
"Name": "/hardcore_saha",
"RestartCount": 0,
"Driver": "overlay2",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"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": 0,
"MemorySwappiness": -1,
"OomKillDisable": false,
"PidsLimit": 0,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0
},
"GraphDriver": {
"Data": {
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"MergedDir": "/var/lib/docker/overlay2/0f7ec661c39afe24cff6b3c87f5f6b1b0a68f2cbe8a245321812dbdb8ec645fb/merged",
"UpperDir": "/var/lib/docker/overlay2/0f7ec661c39afe24cff6b3c87f5f6b1b0a68f2cbe8a245321812dbdb8ec645fb/diff",
"WorkDir": "/var/lib/docker/overlay2/0f7ec661c39afe24cff6b3c87f5f6b1b0a68f2cbe8a245321812dbdb8ec645fb/work"
},
"Name": "overlay2"
},
"Mounts": [],
"Config": {
"Hostname": "1912d9ff49fd",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": true,
"AttachStderr": true,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"no_proxy=*.local, 169.254/16",
"PATH=/usr/local/rbenv/shims:/usr/local/rbenv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"LANG=C.UTF-8",
"PYTHON_VERSION=2.7.10",
"PYTHON_PIP_VERSION=7.1.2",
"AWS_DEFAULT_REGION=us-west-2",
"DEBIAN_FRONTEND=noninteractive",
"JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64",
"RBENV_ROOT=/usr/local/rbenv",
"R_BASE_VERSION=3.2.3",
"R_LIBS=/usr/local/lib/R/site-library:/usr/local/lib/R/library:/usr/lib/R/library"
],
"Cmd": [
"python2"
],
"Image": "datalab/datalab-analytics",
"Volumes": null,
"WorkingDir": "/",
"Entrypoint": null,
"OnBuild": null,
"Labels": {}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "b239153fb86ac3d24185d5fd658a4d4b3d39a37d58abcf038837daa912790181",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "/var/run/docker/netns/b239153fb86a",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "",
"Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"MacAddress": "",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "1c73c2ed54ce01953cdf07db0e1d8bcd9a26687d22229fcf0214e5a78e88361e",
"EndpointID": "",
"Gateway": "",
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "",
"DriverOpts": null
}
}
}
}
]
Flags
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docker notes on the virtual microservice container platform
Installing the docker platform: Docker/Installing Docker Hello World: Docker/Hello World
Creating Docker Containers: Getting docker containers from docker hub: Docker/Dockerhub Creating docker containers with dockerfiles: Docker/Dockerfiles Managing Dockerfiles using git: Docker/Dockerfiles/Git Setting up Python virtualenv in container: Docker/Virtualenv
Running docker containers: Docker/Basics Dealing with volumes in Docker images: Docker/Volumes Removing Docker images: Docker/Removing Images Rsync Docker Container: Docker/Rsync
Networking with Docker Containers:
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docker pods pods are groups of docker containers that travel together
Docker pods are collections of Docker containers that are intended to run in concert for various applications.
Wireless Sensor Data Acquisition Pod The wireless sensor data acquisition pod deploys containers This pod uses the following technologies: Stunnel · Rsync · Apache · MongoDB · Python · Jupyter (numerical Python stack)
Deep Learning Pod This pod utilizes the following technologies: Python · Sklearn · Jupyter (numerical Python stack) · Keras · TensorFlow
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