简介

说明

    本文介绍如何查看容器的启动命令。

原命令

本处我先创建一个redis容器，命令如下：

docker run -p 6379:6379 --name container_redis \
-v /work/docker/redis/config:/etc/redis/config \
-v /work/docker/redis/data:/data \
-d redis redis-server /etc/redis/config/redis.conf

创建好之后如下：

knife@ubuntu:~$ docker ps -a                
CONTAINER ID   IMAGE     COMMAND                  CREATED         STATUS                    PORTS     NAMES
3cc96a16754f   redis     "docker-entrypoint.s…"   12 months ago   Exited (0) 3 months ago             container_redis

方法总结

docker ps -a --no-trunc
信息少
无法重现命令
docker inspect
json格式，信息多
无法重现命令
runlike
第三方包，信息多
不能重现命令
get_command_4_run_container（推荐）
第三方包
几乎完美重现命令

法1：docker ps -a --no-trunc（信息少）

说明

需要sudo去执行。

执行命令并查看结果

执行命令：

sudo docker ps -a --no-trunc

结果

CONTAINER ID                                                       IMAGE     COMMAND                                                            CREATED         STATUS                    PORTS     NAMES
3cc96a16754f761fdff4eb04a8b87672db8dc33f7c09ddb978446bfcc2b970c1   redis     "docker-entrypoint.sh redis-server /etc/redis/config/redis.conf"   12 months ago   Exited (0) 3 months ago             container_redis

分析

可以看到，其展示的命令为：docker-entrypoint.sh redis-server /etc/redis/config/redis.conf，与我们的命令差距很多。

法2：docker inspect（json格式，信息多）

说明

格式：docker inspect [container_name]/[container_id]

执行命令并查看结果

执行命令

docker inspect 3cc9

结果

[
    {
        "Id": "3cc96a16754f761fdff4eb04a8b87672db8dc33f7c09ddb978446bfcc2b970c1",
        "Created": "2021-08-15T10:55:17.432645938Z",
        "Path": "docker-entrypoint.sh",
        "Args": [
            "redis-server",
            "/etc/redis/config/redis.conf"
        ],
        "State": {
            "Status": "exited",
            "Running": false,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 0,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2022-05-07T13:41:56.74430811Z",
            "FinishedAt": "2022-05-07T13:44:32.016651639Z"
        },
        "Image": "sha256:621ceef7494adfcbe0e523593639f6625795cc0dc91a750629367a8c7b3ccebb",
        "ResolvConfPath": "/var/lib/docker/containers/3cc96a16754f761fdff4eb04a8b87672db8dc33f7c09ddb978446bfcc2b970c1/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/3cc96a16754f761fdff4eb04a8b87672db8dc33f7c09ddb978446bfcc2b970c1/hostname",
        "HostsPath": "/var/lib/docker/containers/3cc96a16754f761fdff4eb04a8b87672db8dc33f7c09ddb978446bfcc2b970c1/hosts",
        "LogPath": "/var/lib/docker/containers/3cc96a16754f761fdff4eb04a8b87672db8dc33f7c09ddb978446bfcc2b970c1/3cc96a16754f761fdff4eb04a8b87672db8dc33f7c09ddb978446bfcc2b970c1-json.log",
        "Name": "/container_redis",
        "RestartCount": 0,
        "Driver": "overlay2",
        "Platform": "linux",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "docker-default",
        "ExecIDs": null,
        "HostConfig": {
            "Binds": [
                "/work/docker/redis/config:/etc/redis/config",
                "/work/docker/redis/data:/data"
            ],
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "json-file",
                "Config": {}
            },
            "NetworkMode": "default",
            "PortBindings": {
                "6379/tcp": [
                    {
                        "HostIp": "",
                        "HostPort": "6379"
                    }
                ]
            },
            "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": 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,
            "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": [
                "/proc/asound",
                "/proc/acpi",
                "/proc/kcore",
                "/proc/keys",
                "/proc/latency_stats",
                "/proc/timer_list",
                "/proc/timer_stats",
                "/proc/sched_debug",
                "/proc/scsi",
                "/sys/firmware"
            ],
            "ReadonlyPaths": [
                "/proc/bus",
                "/proc/fs",
                "/proc/irq",
                "/proc/sys",
                "/proc/sysrq-trigger"
            ]
        },
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/6f7b59f8a6115763ce859b21e36ec8c9830168b68209553e9ba124c4fe041502-init/diff:/var/lib/docker/overlay2/4212737a00b6ba82cf09874c0eeabae4ca0aa0345b5fcd1690eaf4609284a801/diff:/var/lib/docker/overlay2/e6623c58e41ef054763a1f98b556ad13d61cdf09fc792a60170aaa199a3b812d/diff:/var/lib/docker/overlay2/43d31a4b08141db74748b65900c46de397264a5d2f0e0ac90618fee5892b0e53/diff:/var/lib/docker/overlay2/789cfe51a57d9f1466a1c607972fe05c1183021323dec70765ad8757b3a50e94/diff:/var/lib/docker/overlay2/5235f3100764a73f7ae63908bc4c38acea558c2857ef133bd07b146c8fe75e03/diff:/var/lib/docker/overlay2/79545a883b658eafbebbd1e7f753c9a3dd1ddc3afeb68c211eba6c8f98cb2cbd/diff",
                "MergedDir": "/var/lib/docker/overlay2/6f7b59f8a6115763ce859b21e36ec8c9830168b68209553e9ba124c4fe041502/merged",
                "UpperDir": "/var/lib/docker/overlay2/6f7b59f8a6115763ce859b21e36ec8c9830168b68209553e9ba124c4fe041502/diff",
                "WorkDir": "/var/lib/docker/overlay2/6f7b59f8a6115763ce859b21e36ec8c9830168b68209553e9ba124c4fe041502/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [
            {
                "Type": "bind",
                "Source": "/work/docker/redis/data",
                "Destination": "/data",
                "Mode": "",
                "RW": true,
                "Propagation": "rprivate"
            },
            {
                "Type": "bind",
                "Source": "/work/docker/redis/config",
                "Destination": "/etc/redis/config",
                "Mode": "",
                "RW": true,
                "Propagation": "rprivate"
            }
        ],
        "Config": {
            "Hostname": "3cc96a16754f",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "6379/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "GOSU_VERSION=1.12",
                "REDIS_VERSION=6.0.10",
                "REDIS_DOWNLOAD_URL=http://download.redis.io/releases/redis-6.0.10.tar.gz",
                "REDIS_DOWNLOAD_SHA=79bbb894f9dceb33ca699ee3ca4a4e1228be7fb5547aeb2f99d921e86c1285bd"
            ],
            "Cmd": [
                "redis-server",
                "/etc/redis/config/redis.conf"
            ],
            "Image": "redis",
            "Volumes": {
                "/data": {}
            },
            "WorkingDir": "/data",
            "Entrypoint": [
                "docker-entrypoint.sh"
            ],
            "OnBuild": null,
            "Labels": {}
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "9c1a358b64057773c092066f512e0b81c09da5a4493a334815e1f5eef79080b0",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {},
            "SandboxKey": "/var/run/docker/netns/9c1a358b6405",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "",
            "Gateway": "",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "",
            "IPPrefixLen": 0,
            "IPv6Gateway": "",
            "MacAddress": "",
            "Networks": {
                "bridge": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": null,
                    "NetworkID": "ec1e270faa291c8a4ba08c96d5784ded8d33f91771b6af6176620c90c2b1be23",
                    "EndpointID": "",
                    "Gateway": "",
                    "IPAddress": "",
                    "IPPrefixLen": 0,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "",
                    "DriverOpts": null
                }
            }
        }
    }
]

分析

可以看到，结果很全。但无法准确得到自己执行的命令是什么，只能对比结果中的字段。

法3：runlike（信息多，不能重现命令）

说明

    这是个第三方包，需要先安装：

python3里包含pip工具

sudo apt-get install python3;

使用pip安装runlike

sudo pip install runlike

runlike命令格式：runlike -p [容器名称]/[容器ID]

执行命令并查看结果

执行命令

runlike -p 3cc9

结果

docker run \
        --name=container_redis \
        --hostname=3cc96a16754f \
        --env=PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \
        --env=GOSU_VERSION=1.12 \
        --env=REDIS_VERSION=6.0.10 \
        --env=REDIS_DOWNLOAD_URL=http://download.redis.io/releases/redis-6.0.10.tar.gz \
        --env=REDIS_DOWNLOAD_SHA=79bbb894f9dceb33ca699ee3ca4a4e1228be7fb5547aeb2f99d921e86c1285bd \
        --volume=/work/docker/redis/config:/etc/redis/config \
        --volume=/work/docker/redis/data:/data \
        --volume=/data \
        --workdir=/data \
        -p 6379:6379 \
        --restart=no \
        --runtime=runc \
        --detach=true \
        redis \
        redis-server /etc/redis/config/redis.conf

分析

可以发现，参数也是比较全，大致可以对比出原来的命令。

法4：get_command_4_run_container（完美）

说明

    这是个第三方包，需要先安装：

docker pull cucker/get_command_4_run_container

命令格式：

docker run --rm -v /var/run/docker.sock:/var/run/docker.sock cucker/get_command_4_run_container [容器名称]/[容器ID]

可以将其封装为一个别名：

echo "alias get_run_command='docker run --rm -v /var/run/docker.sock:/var/run/docker.sock cucker/get_command_4_run_container'" >> ~/.bashrc \
&& \
. ~/.bashrc

这样就可以这样用了：get_run_command [容器名称]/[容器ID]

执行命令并查看结果

执行命令

 docker run --rm -v /var/run/docker.sock:/var/run/docker.sock cucker/get_command_4_run_container 3cc9

结果

分析

可以发现，几乎完美复现出了原来的命令！！