Docker 이것저것
By enumclass
Software활용
2020. 3. 27. 16:31

docker container 설정 수정하기

docker run 이후 policy의 수정을 위해서는 다음 2가지 방법이 있음

  • docker update
docker update --restart=always <container>
  • /var/lib/docker/containers/CONTAINER_ID/hostconfig.json 파일 edit
{"Binds":["/nexus-data:/nexus-data"],"ContainerIDFile":"","LogConfig":{"Type":"journald","Config":{}},"NetworkMode":"default","PortBindings":{"8081/tcp":[{"HostIp":"","HostPort":"8081"}]},"RestartPolicy":{"Name":"always","MaximumRetryCount":0},"AutoRemove":false,"VolumeDriver":"","VolumesFrom":null,"CapAdd":null,"CapDrop":null,"Dns":[],"DnsOptions":[],"DnsSearch":[],"ExtraHosts":null,"GroupAdd":null,"IpcMode":"","Cgroup":"","Links":[],"OomScoreAdj":0,"PidMode":"","Privileged":true,"PublishAllPorts":false,"ReadonlyRootfs":false,"SecurityOpt":["label=disable"],"UTSMode":"","UsernsMode":"","ShmSize":67108864,"Runtime":"docker-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":[],"DiskQuota":0,"KernelMemory":0,"MemoryReservation":0,"MemorySwap":0,"MemorySwappiness":-1,"OomKillDisable":false,"PidsLimit":0,"Ulimits":null,"CpuCount":0,"CpuPercent":0,"IOMaximumIOps":0,"IOMaximumBandwidth":0}

 

docker log 보기

  • docker logs -f <> : 실행중인 로그 확인 할 경우
  • docker events& : event 발생 로그 확인 (터미널을 2개 여는게 좋음)
  • docker start -a <> : 실행시 일어나는 오류 확인 가능

 

docker inspect

container의 상세 정보를 확인하는 명령어 이다.

docker inspect <<containerid>>

해당 명령어를 실행 하면 아래와 같이 모든 container low level 정보를 return 한다.

[devops@localhost ~]$ docker inspect nexus
[
    {
        "Id": "67826ba9e0179b6009c9c7a177fe1815fd320cdac65ea91d479413f7c4e5e81a",
        "Created": "2019-06-26T03:19:12.069213873Z",
        "Path": "sh",
        "Args": [
            "-c",
            "${SONATYPE_DIR}/start-nexus-repository-manager.sh"
        ],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 19383,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2019-07-02T07:49:00.930407162Z",
            "FinishedAt": "2019-07-02T07:48:08.216626691Z"
        },
        "Image": "sha256:36b0df681a47e5948f2088a446652766132141175dece2d6d47ef6e749385c05",
        "ResolvConfPath": "/var/lib/docker/containers/67826ba9e0179b6009c9c7a177fe1815fd320cdac65ea91d479413f7c4e5e81a/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/67826ba9e0179b6009c9c7a177fe1815fd320cdac65ea91d479413f7c4e5e81a/hostname",
        "HostsPath": "/var/lib/docker/containers/67826ba9e0179b6009c9c7a177fe1815fd320cdac65ea91d479413f7c4e5e81a/hosts",
        "LogPath": "",
        "Name": "/nexus",
        "RestartCount": 0,
        "Driver": "overlay2",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "",
        "ExecIDs": null,
        "HostConfig": {
            "Binds": [
                "/nexus-data:/nexus-data"
            ],
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "journald",
                "Config": {}
            },
            "NetworkMode": "default",
            "PortBindings": {
                "8081/tcp": [
                    {
                        "HostIp": "",
                        "HostPort": "8081"
                    }
                ]
            },
            "RestartPolicy": {
                "Name": "always",
                "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": true,
            "PublishAllPorts": false,
            "ReadonlyRootfs": false,
            "SecurityOpt": [
                "label=disable"
            ],
            "UTSMode": "",
            "UsernsMode": "",
            "ShmSize": 67108864,
            "Runtime": "docker-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": [],
            "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": {
            "Name": "overlay2",
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/bdeae8fe832211ba5059562162cb4eb7098de60657f622a31f0115653c324301-init/diff:/var/lib/docker/overlay2/e3c7b24292cf5ea41f2d3ab9c3b91a3c3b22f09a1cb26cf6048b36802c30b036/diff:/var/lib/docker/overlay2/3f075ffc65dfb1a311d63c70842d0ba2c467ca9bf1289c5a2a45a21e77a8314c/diff:/var/lib/docker/overlay2/32e8540578f9058f575a9051bc28df2f0308da53a20469a3a91c1a6b60f9cb0e/diff",
                "MergedDir": "/var/lib/docker/overlay2/bdeae8fe832211ba5059562162cb4eb7098de60657f622a31f0115653c324301/merged",
                "UpperDir": "/var/lib/docker/overlay2/bdeae8fe832211ba5059562162cb4eb7098de60657f622a31f0115653c324301/diff",
                "WorkDir": "/var/lib/docker/overlay2/bdeae8fe832211ba5059562162cb4eb7098de60657f622a31f0115653c324301/work"
            }
        },
        "Mounts": [
            {
                "Type": "bind",
                "Source": "/nexus-data",
                "Destination": "/nexus-data",
                "Mode": "",
                "RW": true,
                "Propagation": "rprivate"
            }
        ],
        "Config": {
            "Hostname": "67826ba9e017",
            "Domainname": "",
            "User": "nexus",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "8081/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "SONATYPE_DIR=/opt/sonatype",
                "NEXUS_HOME=/opt/sonatype/nexus",
                "NEXUS_DATA=/nexus-data",
                "NEXUS_CONTEXT=",
                "SONATYPE_WORK=/opt/sonatype/sonatype-work",
                "DOCKER_TYPE=docker",
                "INSTALL4J_ADD_VM_PARAMS=-Xms1200m -Xmx1200m -XX:MaxDirectMemorySize=2g -Djava.util.prefs.userRoot=/nexus-data/javaprefs"
            ],
            "Cmd": [
                "sh",
                "-c",
                "${SONATYPE_DIR}/start-nexus-repository-manager.sh"
            ],
            "ArgsEscaped": true,
            "Image": "sonatype/nexus3",
            "Volumes": {
                "/nexus-data": {}
            },
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "com.sonatype.license": "Apache License, Version 2.0",
                "com.sonatype.name": "Nexus Repository Manager base image",
                "org.label-schema.build-date": "20190305",
                "org.label-schema.license": "GPLv2",
                "org.label-schema.name": "CentOS Base Image",
                "org.label-schema.schema-version": "1.0",
                "org.label-schema.vendor": "CentOS",
                "vendor": "Sonatype"
            }
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "50b3a078a453332680ca6dd09d2cd10fc641fddc49c5b3b34db178c516f8475d",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {
                "8081/tcp": [
                    {
                        "HostIp": "0.0.0.0",
                        "HostPort": "8081"
                    }
                ]
            },
            "SandboxKey": "/var/run/docker/netns/50b3a078a453",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "b030c131340f1b86c3ce868dae109fee9814310503076f685ff274b42e76eeac",
            "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": "e7bccaaf25cb4ba061b98aab2ef6470301c688b7d99db0f40e7e7bd7b6665379",
                    "EndpointID": "b030c131340f1b86c3ce868dae109fee9814310503076f685ff274b42e76eeac",
                    "Gateway": "172.17.0.1",
                    "IPAddress": "172.17.0.2",
                    "IPPrefixLen": 16,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "02:42:ac:11:00:02"
                }
            }
        }
    }
]

여기서 특정 영역에 대한 정보만을 얻고 싶다면 다음과 같이 format 설정을 해주면 된다.

docker inspect --format 또는

docker inspect -f

를 사용하면 된다. 사용 법은 다음과 같다.

[devops@localhost ~]$ docker inspect --format='{{.NetworkSettings.Networks}}' nexus
map[bridge:0xc420130300]

inspect 해서 나온 모든 정보 중에서 필요로 하는 정보의 Name을 .Name.Name 식으로 표현 하면 특정 값을 얻어 낼 수가 있다. 가령 IPAddress를 얻어 오고자 하면 다음과 같이 하면 된다.

[devops@localhost ~]$ docker inspect --format='{{.NetworkSettings.Networks.bridge.IPAddress}}' nexus
172.17.0.2

만약 해당 결과 값을 json 형태의 템플릿으로 받고자 하면 다음과 같이 하면 된다.

[devops@localhost ~]$ docker inspect --format='{{json .NetworkSettings.Networks.bridge.IPAddress}}' nexus                   "172.17.0.2"

"" 앞뒤로 이와 같은게 붙은거 빼고는 차이가 없어 보이지만,

[devops@localhost ~]$ docker inspect --format='{{json .NetworkSettings.Networks}}' nexus
{"bridge":{"IPAMConfig":null,"Links":null,"Aliases":null,"NetworkID":"e7bccaaf25cb4ba061b98aab2ef6470301c688b7d99db0f40e7e7bd7b6665379","EndpointID":"b030c131340f1b86c3ce868dae109fee9814310503076f685ff274b42e76eeac","Gateway":"172.17.0.1","IPAddress":"172.17.0.2","IPPrefixLen":16,"IPv6Gateway":"","GlobalIPv6Address":"","GlobalIPv6PrefixLen":0,"MacAddress":"02:42:ac:11:00:02"}}

Networks만을 출력하면 다른걸 확인 할 수있다. 앞서 json없이 출력은 메모리 번지를 출력 했다면, json과 함께 출력 하면 이하 모든 값이 string으로 출력 되는걸 확인 할 수 있다.

이외에 index, range,$variableParm 정의, :=Assignment 등이 추가로 잇는듯 한데 어떻게 사용하는지는 잘 모르겠다.

docker shell 로 바로 진입하기

docker run -it --rm <<이미지id>> /bin/sh or

docker run -it --rm <<이미지id>> /bin/bash or

docker run -it --rm --entrypoint /bin/bash <<이미지id>> or

docker run -it --rm <<이미지id>> sh or

docker run -it --rm --entrypoint sh <<이미지id>>

or

docker exec -it --rm <<이미지id>> /bin/sh or

docker exec -it --rm <<이미지id>> /bin/bash or

docker exec -it --rm --entrypoint /bin/bash <<이미지id>> or

docker exec -it --rm <<이미지id>> sh or

docker exec  -it --rm --entrypoint sh <<이미지id>>

 

docker-compose 완전히 삭제하기

docker-compose down
docker rm -f $(docker ps -a -q)
docker volume rm $(docker volume ls -q)

docker-compose 시작

docker-compose up -d

여기서 -d는 background 실행이다.

 

Docker Volume

Docker가 Host PC의 Volume을 지나치게 먹을 때가 있다

$ df -h
파일 시스템     크기  사용  가용 사용% 마운트위치
tmpfs           3.1G   28M  3.1G    1% /run
/dev/sda1       907G  860G  683M  100% /
tmpfs            16G   52K   16G    1% /dev/shm
tmpfs           5.0M   16K  5.0M    1% /run/lock
/dev/sda2       221M  6.1M  215M    3% /boot/efi
tmpfs           3.1G   68K  3.1G    1% /run/user/1000

이런 경우에는 어디서 disk를 사용하는지 정확하게 알 필요가 있다

 

`docker system df`를 확인해 보면 Local Volumes에서 지나치게 많은 양의 디시크를 사용하고 있음을 확인 가능하다.

$ docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          11        2         5.35GB    4.023GB (75%)
Containers      4         3         185B      182B (98%)
Local Volumes   37        4         876.3GB   268.6MB (0%)
Build Cache     0         0         0B        0B

더 상세하게 알아보자

$ docker system df -v
Images space usage:

REPOSITORY                      TAG            IMAGE ID       CREATED        SIZE      SHARED SIZE   UNIQUE SIZE   CONTAINERS
mysql                           latest         f6360852d654   11 days ago    564.8MB   0B            564.8MB       1
restserver                      latest         f2c153cb0e8c   2 weeks ago    470.1MB   455.9MB       14.23MB       0
javadocker2                     latest         5f6a3f775da8   2 weeks ago    464MB     455.9MB       8.096MB       0
sdkperf                         latest         cccdbeacb1fc   2 weeks ago    464MB     455.9MB       8.096MB       0
eclipse-temurin                 17-jdk-jammy   3a958eff0206   4 weeks ago    455.9MB   455.9MB       0B            0
haproxy                         latest         f48e4ec6d150   4 weeks ago    103.7MB   0B            103.7MB       0
solace/solace-pubsub-standard   latest         32f63cd84dac   6 weeks ago    1.285GB   523.2MB       762.1MB       0
confluentinc/cp-kafka           latest         8309da75aced   2 months ago   844.6MB   717.8MB       126.8MB       0
confluentinc/cp-zookeeper       latest         5567928528f5   2 months ago   844.6MB   717.8MB       126.8MB       0          1.27GB        0

Containers space usage:

CONTAINER ID   IMAGE     COMMAND                  LOCAL VOLUMES   SIZE      CREATED      STATUS                    NAMES
a64074eb1ae2   mysql     "docker-entrypoint.s…"   1               182B      9 days ago   Exited (255) 7 days ago   mysql

Local Volumes space usage:

VOLUME NAME                                                        LINKS     SIZE
06345bd01dbe7750c7dbd4b7ec74321e3e0bc7101eab09d97e04addb6adf22d2   0         67.11MB
1fb305b6a3b59bb6cb9793ff8b53826ccc4efe7094b5ea05d6cab80d7fb8120c   0         100B
339d39f47e6b0c604c17bf3de6af4ee78389e23613d1ae10a1866a7694fcf850   0         96B
cfae9b6964560aa744bace49e64c47ad71a2c687986912dd54a57d9ba546eeee   0         0B
1dd7436824f8cbfc93aae9424909f702b3480c024a82773a2d5208a356e6e945   0         96B
3e8df0253c3ce30bf00a320667dde7da24a69e6c468b113805a7d89938942272   0         100B
6c783159f68cccc4e01a27f5b24d6afacb9fefc9d18f30656a61dd231b95826e   0         0B
5e35be3d12eb7ee8e53c148d0a10f6abf3550e027a2fcf0219ebbef7a4564bf8   0         0B
8aa7abea8ef92a08fdb9f18f5389df04d8e497edb66d3d1b7374d2f5d72a07c7   0         0B
f99b7f80039cd36dda8211c6049db49cd1835b201215a69527195f9e97bc7e8d   0         8B
5791d37dfe55b4e4e17fc2bc54834813e0a537fe2b1c0f0e6cd81a335e08c419   0         0B
83efad96be18ef3ce5e7993bf9a4aab17b3e1050b4c13eb4925f8c353b496cb1   0         0B
abfe5a23ac5766dcfe8e060e1fe847b27601f68a8c7c515f9f4522cc15f1c1e5   0         0B
e0c229c8f79979e72bc0fe5fefe0fbca0ab8043c5fce4f8b167be779f1bd50b6   0         67.11MB
c038cefdc86f386b1389d339261d52b49df286be3ec2ee6dcf3d8b5fa555e812   0         458B
template_storage-group2                                            0         1.474GB
375d4ee4879cba91c18f4cd3a0a2bc61bb916221f433e31ba5089a45ee70205c   0         8B
648bade5e53a6197fcdafa5967b859c7b0577ceeca253111e85e9dbe5c156f7f   0         67.11MB
9491d07682339cae707db5bdf8ff1c873dde1d44c4d38e45435db9461b32e891   0         458B
ab1997c8a389b6bf38edb2f63072fe4c6239aea23d16f9089dbe2694a76e999c   0         96B
0490bb0a82f7e1097d8e1c337e8161563adadb31b57b25eb81b8c8cf3b3c799a   0         0B
07d90e41c38081dcc110e3c881f80f7513845f60daeb6a6951bdfbe3ba699510   0         0B
84f4d8d587447a130dc44bd99eec2f4f941957b7c392cc56d5e0485a327aa9b2   0         0B
d8c737551bf51aacb59a8f116f963f523a79df7599793e6441d4a68e7c6f6eae   0         0B
332a18fa7dba5fa3d615f97aadbbca5a24ce0273343724f0c38c3318aedd2989   0         96B
3695aabd55bc98245aef5a94ac222f2dd9e810cb228f2e830d96f67d1f1b0fc4   0         0B
6c07a26976903e83e5b54cc66fcecf3f263cde1429eecd08fd2e12c3e7981506   0         458B
a12e0c54790f6b8330f65b656c8af4ac5eb5423d993cea5bfb733765ed29c333   0         0B
891ba7f12e9a5ba196710334281a8330eb1bf4fc1a2f5d442f777a0a1f951a36   0         8B
c7c2049f87c61d588c0232c95ba262e755f4140dc135ff95bf113f9ea83a2820   0         0B
c7cf3e8b1e70d1633ddfca82549c8a5337bbce4c07afd827734139ef3c3fdb26   1         209.4MB
template_storage-group1                                            0         873GB
0edde1674b046452c51a8310fea3a34cdd221fae1bdb7c7b3467434c3b66ec41   0         458B
2ea3a2f3fe4dd66e46a99cdfa5ae512315a570cfb38333cee0e7bad3771869d5   0         67.11MB
67e88becb22b06953719289772d52b38014867c204d329d1df27c08af233a8c5   0         137.5kB
745241baacab3f1fe2fddddb22070ef46157199662f7c107869f0fa192ea5c32   0         0B
template_storage-group3                                            0         1.318GB

Build cache usage: 0B

CACHE ID   CACHE TYPE   SIZE      CREATED   LAST USED   USAGE     SHARED

 

template_storage-group1                                            0         873GB

이 너무 많은 데이터를 저장하고 있다. 일반적으로 그러면 안되지만 과감하게 해당 볼륨을 삭제 하자.

물론 그전에 작동중인 컨테이너는 중지하자.

$ docker volume rm template_storage-group1
template_storage-group1

사용율이 6%로 내려온 것을 확인 할 수 있다

$ df -h
파일 시스템     크기  사용  가용 사용% 마운트위치
tmpfs           3.1G   28M  3.1G    1% /run
/dev/sda1       907G   47G  814G    6% /
tmpfs            16G   52K   16G    1% /dev/shm
tmpfs           5.0M   16K  5.0M    1% /run/lock
/dev/sda2       221M  6.1M  215M    3% /boot/efi
tmpfs           3.1G   68K  3.1G    1% /run/user/1000

 

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