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Carlos Cuevas edited this page Dec 5, 2018 · 1 revision

Docker Mastery Notes

Differences between the CE and EE

  • CE is free and EE is paid per node
  • Actually EE is just for big company requiring LDAP authentication, support and so.

Differences between Edge and Stable versions

  • Edge is beta release mothly based, more features but just suported for 1 month
  • Stable is the one which comes once a quarter, so they are supported for 4 months just after the next stable release.

Docker commands

Docker commmand format

The syntax changed to

docker <command> <sub_command> (options)

Before and still is working:

docker <command> (options)

Basic commands for docker server

  • docker version just show the version
  • docker info it will show much more than that For example how many containers are running, how many images are installed and so...

Basic commands for docker containers

Docker container inspect

This will just show the configuration of the specified container

docker container inspect container_name

For example:

[
    {
        "Id": "4793f8a12980b98293860f5760886d16dd6a509fa71b656aa0d906d565cdf042",
        "Created": "2018-12-05T21:53:05.93797098Z",
        "Path": "docker-entrypoint.sh",
        "Args": [
            "mysqld"
        ],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 1346,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2018-12-05T21:53:06.233443685Z",
            "FinishedAt": "0001-01-01T00:00:00Z"
        },
        "Image": "sha256:f991c20cb5087fdd01fa7a2181f0a123a54d697681cf3723370bf50566d2e7cf",
        "ResolvConfPath": "/var/lib/docker/containers/4793f8a12980b98293860f5760886d16dd6a509fa71b656aa0d906d565cdf042/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/4793f8a12980b98293860f5760886d16dd6a509fa71b656aa0d906d565cdf042/hostname",
        "HostsPath": "/var/lib/docker/containers/4793f8a12980b98293860f5760886d16dd6a509fa71b656aa0d906d565cdf042/hosts",
        "LogPath": "/var/lib/docker/containers/4793f8a12980b98293860f5760886d16dd6a509fa71b656aa0d906d565cdf042/4793f8a12980b98293860f5760886d16dd6a509fa71b656aa0d906d565cdf0$
        "Name": "/mysql",
        "RestartCount": 0,
        "Driver": "overlay2",
        "Platform": "linux",
        "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": [],
                       "Dns": [],
            "DnsOptions": [],
            "DnsSearch": [],
            "ExtraHosts": null,
            "GroupAdd": null,
            "IpcMode": "shareable",
            "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": [],
            "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": null,
            "OomKillDisable": false,
            "PidsLimit": 0,
            "Ulimits": null,
            "CpuCount": 0,
            "CpuPercent": 0,
            "IOMaximumIOps": 0,
            "IOMaximumBandwidth": 0,
            "MaskedPaths": [
            "IOMaximumBandwidth": 0,
            "MaskedPaths": [
                "/proc/acpi",
                "/proc/kcore",
                "/proc/keys",
                "/proc/latency_stats",
                "/proc/timer_list",
                "/proc/timer_stats",
                "/proc/sched_debug",
                "/proc/scsi",
                "/sys/firmware"
            ],
            "ReadonlyPaths": [
                "/proc/asound",
                "/proc/bus",
                "/proc/fs",
                "/proc/irq",
                "/proc/sys",
                "/proc/sysrq-trigger"
            ]
        },
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/527735eeec9cd54797f428f42813017e773c80d360e7702ef763a86d0cbf9224-init/diff:/var/lib/docker/overlay2/f70ff4b52b8a4606194d$
                "MergedDir": "/var/lib/docker/overlay2/527735eeec9cd54797f428f42813017e773c80d360e7702ef763a86d0cbf9224/merged",
                "UpperDir": "/var/lib/docker/overlay2/527735eeec9cd54797f428f42813017e773c80d360e7702ef763a86d0cbf9224/diff",
                "WorkDir": "/var/lib/docker/overlay2/527735eeec9cd54797f428f42813017e773c80d360e7702ef763a86d0cbf9224/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [
            {
                "Type": "volume",
                "Name": "8c8e8f12230d243ce6b207de6c0dc523ad509d5fffcba78adb9912eb3aa739af",
                "Source": "/var/lib/docker/volumes/8c8e8f12230d243ce6b207de6c0dc523ad509d5fffcba78adb9912eb3aa739af/_data",
                "Destination": "/var/lib/mysql",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],
        "Config": {
            "Hostname": "4793f8a12980",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "3306/tcp": {},
                "33060/tcp": {}
            },
            "Tty": false,
                       },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "MYSQL_ROOT_PASSWORD=true",
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "GOSU_VERSION=1.7",
                "MYSQL_MAJOR=8.0",
                "MYSQL_VERSION=8.0.13-1debian9"
            ],
            "Cmd": [
                "mysqld"
            ],
            "ArgsEscaped": true,
            "Image": "mysql",
            "Volumes": {
                "/var/lib/mysql": {}
            },
            "WorkingDir": "",
            "Entrypoint": [
                "docker-entrypoint.sh"
            ],
            "OnBuild": null,
            "Labels": {}
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "33c0c953c2ddf03154cca043035d12f318f904c489c57d5c4d69c7a231eebc52",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {
                "3306/tcp": null,
                "33060/tcp": null
            },
            "SandboxKey": "/var/run/docker/netns/33c0c953c2dd",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "5c4671c1ef240a818aea7c448092622393cea9d5c83713a5babd6de9178708d7",
            "Gateway": "172.17.0.1",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "172.17.0.3",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
            "MacAddress": "02:42:ac:11:00:03",
            "Networks": {
                "bridge": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": null,
                    "NetworkID": "e9aad43ae1bd78030a35314306810311578c42ac273b8028580db4b7604a8a93",
                    "EndpointID": "5c4671c1ef240a818aea7c448092622393cea9d5c83713a5babd6de9178708d7",
                     "SandboxID": "33c0c953c2ddf03154cca043035d12f318f904c489c57d5c4d69c7a231eebc52",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {
                "3306/tcp": null,
                "33060/tcp": null
            },
            "SandboxKey": "/var/run/docker/netns/33c0c953c2dd",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "5c4671c1ef240a818aea7c448092622393cea9d5c83713a5babd6de9178708d7",
            "Gateway": "172.17.0.1",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "172.17.0.3",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
            "MacAddress": "02:42:ac:11:00:03",
            "Networks": {
                "bridge": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": null,
                    "NetworkID": "e9aad43ae1bd78030a35314306810311578c42ac273b8028580db4b7604a8a93",
                    "EndpointID": "5c4671c1ef240a818aea7c448092622393cea9d5c83713a5babd6de9178708d7",
                    "Gateway": "172.17.0.1",
                    "IPAddress": "172.17.0.3",
                    "IPPrefixLen": 16,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "02:42:ac:11:00:03",
                    "DriverOpts": null
                }
            }
        }
    }
]

Docker container logs

This will just show the logs of the specified container

docker container logs container_name

Docker container rm

For deleting containers

docker container rm container_name

  • If you want to force delete a running container for example use docker container rm -f container_name

Docker container run

  • Whenever we invoke docker container run, we create a new container this is the main difference with docker start

  • Also if we do not specify a name using the parameter: --name docker will assing an unique name for our container.

    • nginx in the 80 for example for having attached session _

      docker container run --publish 80:80 --name web1 nginx this is equivalent to the old way:

      docker run -p 80:80 nginx

    • nginx in the 80 for example for having dettach session

      docker container run --publish 80:80 --detach nginx this is equivalent to the old way:

      docker run -p 80:80 -d nginx

So what's it actually happening when we execute this command is:

  1. Looks for the nginx image locally, if it doesn't find int it downloads it from internet (nginx:latest)
  2. Creates a new container based in the image
  3. Gives a virtual IP on a private Network inside docker engine.
  4. OPens up the port 80 and forward it to the 80 in container
  5. Start container using the CMD inside the Dockerimage

Docker container top

This will show the processes running inside the specified container

docker container top container_name

Docker container stats

This will show the performance of the the specified container

docker container stats container_name

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