overview
Docker doesn't make configuration changes to your system, but it takes up a lot of disk space. Use it for a short while, and you might be shocked to see some terrible usage statistics. Let's take a look at the size of the data before and after use
use
Usage statistics
PS C:\Users\Tinywan> docker system df
TYPE TOTAL ACTIVE SIZE RECLAIMABLE
Images 16 7 5.753GB 3.81GB (66%)
Containers 7 7 49.62MB 0B (0%)
Local Volumes 3 0 0B 0B
Build Cache 320 0 2.463GB 2.463GB Prune regularly
In order to safely delete stopped containers, unused networks, and hanging images, it's a good idea to run the following command every once in a while
PS C:\Users\Tinywan> docker system prune
WARNING! This will remove:
- all stopped containers
- all networks not used by at least one container
- all dangling images
- all dangling build cache
Are you sure you want to continue? [y/N] y
Deleted Networks:
tinywan-fastgpt_fastgpt
Deleted Images:
deleted: sha256:ef4a886609a086d9b686bcd68a926f0a24bf881f3a91d8e05dacbfe5fc5f5e41
Deleted build cache objects:
fkjiz40kdrbpgdc4njawpdacj
...
kqrvz3c06iayleu8qm6h3lbz8
vwooga4sd6zkrb9jee01aijl4
Total reclaimed space: 2.523GB Full cleanup starts
Every unused container, image, volume, and network can be wiped with a single command
PS C:\Users\Tinywan> docker system prune -a --volumes
WARNING! This will remove:
- all stopped containers
- all networks not used by at least one container
- all anonymous volumes not used by at least one container
- all images without at least one container associated to them
- all build cache
Are you sure you want to continue? [y/N] y
Deleted Volumes:
a57cebc4f2fb960857049240a835dbd3d4b8cfbd66945465bdee339237f0e5b8
c861b2ad2f571a5039e7f22464202470ebd5c9657b1af1b80614505a8dd9ef7b
25a4fb5369543d6c9b6139dffa2e63a60cbeac2afb5fe248395c981ed9a72cb5
Deleted Images:
untagged: mongo:5.0.18
untagged: mongo@sha256:f7483b9319cf0b9f4e524cbd2fed1b9705a5f98b0f232ed3c3fe8f8d01537482
deleted: sha256:6e57b03e71efb109679d76cb88690a3793b3c1702b09d140185678682934eb08
deleted: sha256:18ceb85a767f53e8178bc86fb5107330c15eca2fcb25babc4443a3072d5c67ad
deleted: sha256:62ccd6fc239e990503639148e555cfcd92641f82980ecc81c2298bb6fd2065ef
deleted: sha256:dc1822da3f0bace40ee0570e8624ecb3cb40469c15a28f670bf8a126bab27a56
deleted: sha256:f5386c1e59ed171de128cecea9c61dec92534e863ebf96bd75275f23d7aaecb5
deleted: sha256:fc2c7d97bebd22d75229146886a67040627cea26240b94db351e97891f0a6b10
deleted: sha256:90a8810db37ff18a7d0723f88afe276d797124b37efd554a8b893c55df514ce5
deleted: sha256:f9c1f3d40a3f37cc2c9c7d01be53849599cbe24e71d23d918e61c707e8685508
deleted: sha256:95e4acb933b2bc83bf99d259c76f4e011a351e8f81403ce8802215cfbb8280e8
deleted: sha256:f5bb4f853c84f6579d86f72de5f1d43fc8866443d9a027e2106e3755acefd61c
untagged: registry.cn-hangzhou.aliyuncs.com/fastgpt/fastgpt:latest
untagged: registry.cn-hangzhou.aliyuncs.com/fastgpt/fastgpt@sha256:7941935420ed58049cdbf120b795f19720ce4c33f77cbefbc2fdeff03e9d51a6
deleted: sha256:fc9f32309c331be9489b962869a3fe4045cdb13dcd2b962e67263ecf98526aec
deleted: sha256:91578397531c3e2723dd218420ed68e34036f9b2ad9aefff2906d6eedb5cc211
deleted: sha256:47eb4c3572e81eed6df4957826849f37df163559ec82c2419b50b5d0be6c6d92
deleted: sha256:1632e73dbeabb55b97045675d98dd91613ae1b52264cf683bd5fb195a00ec023
deleted: sha256:2f8a5ec40ccf25e59e50ec8133d6543f46beb48313666f018b6fe43c1c72c494
deleted: sha256:1e553d69708e48e58096b5f61e3885454a62dd84fc556a2cb38f03f2c203ed49
deleted: sha256:cf67ff61f9bb83170155cb2d4707662ef195b01263afb4848535ae1f9594880e
deleted: sha256:c7d440b2fbc6f2962d55ba99aa73185c2584cb730ec116396340e2d3c3f02d4e
deleted: sha256:463ff64bb0def0dc22e8685c47f779abeb09de62ac377a541483a036d8ad5a79
deleted: sha256:9e2e935403e6420c230832b35978a1a94ef4a33e55a2400084ed167fcff885df
deleted: sha256:813e8f10bee62e39c77bb25853b2ea7a191f8ea5566211f11cb3f54f9150ec2f
deleted: sha256:981a719c563d81c87035b80ff80a6be51b2cb0d1e425831128fbcec71ecacf1f
deleted: sha256:a6f9594696e39b9bc2e8f278d23aedc0564487ace670aa3945710cb04f12b5da
deleted: sha256:16bd1391209a11b7fe1eea52fb43c2879df8916485517936d75655a6de3b3af2
deleted: sha256:f1417ff83b319fbdae6dd9cd6d8c9c88002dcd75ecf6ec201c8c6894681cf2b5
untagged: ankane/pgvector:v0.5.0
untagged: ankane/pgvector@sha256:0b3f95132dd71e3972ed30caa140260ba22cbafd35bb8ac398330648cba2fded
untagged: registry.cn-hangzhou.aliyuncs.com/fastgpt/pgvector:v0.5.0
untagged: registry.cn-hangzhou.aliyuncs.com/fastgpt/pgvector@sha256:b39774fb42c2c4d54c45fa838f7b0fe626e1b9692384d75f2a3c1a53b8204735
deleted: sha256:272a4ebc8cc3f5732e4bfc1b4fc6ce4a9f3369490df1f5215981b77c0e08f22e
deleted: sha256:045c32e0e3a685e28e763ada59d6c2b5cd38345f8c5849c89a55ef7a15e631d4
deleted: sha256:bfd8baad8409f5be3e562c9af60c46d8a7e099895a0046fa59d6fdfd4f32140b
deleted: sha256:67cb76f8afc496c6c399ed442a80becf8e1ed84725d9a002140a15043c8de06f
deleted: sha256:fc3a102562d98a65585a3b5b453f36b6cebc509b900cb1581a3cf7b2a8792d57
deleted: sha256:be87653794c7adfd62484c50a7c101b37f5719dfaa94c8f63b26c29e4e1bb9c3
deleted: sha256:59e52d5b26e0260d51ff31a37fd09d4403e32387db1111061e9abfaaac0c3225
deleted: sha256:e81d2074621167317dd796197226bc347c4cff582251f63ef6661eba1f333fca
deleted: sha256:54d1188d0381d86e216039ef511c8320967e305fcf28542f1a8f6fe9f9845e50
deleted: sha256:214fdccb284b4983b060a9b985233226fa98cc42cd128f7743bebd1304d05146
deleted: sha256:8671b99aa7397db41312821820aba285f54320de2f8111d8dc77e5b0cd57416b
deleted: sha256:143edf11cd60b76f3cb8a6f0bb21b9eb9f2be2cfd08cb452ca395274f54336a4
deleted: sha256:9e98afa6d365837777a097d4185740d6fe5eb5d2294a675e03e57cb4cff870dc
deleted: sha256:3a6626c0394ee8fb5c4c3592a9eb260c065cac49a0d8dbc3f69d487716aba3cc
deleted: sha256:827cd90e6de8d299ddd3eeb49c82435e7b00d0c7f9c586e80dd2a5ea8409b0d6
deleted: sha256:511780f88f80081112aea1bfdca6c800e1983e401b338e20b2c6e97f384e4299
untagged: siguremo/yutto:latest
untagged: siguremo/yutto@sha256:585851237b252f34504ff901edff8647e7d2cbed81d250eed918eadd6127bfd6
deleted: sha256:848b6463c5f056ea5de2897fcacef6649a32e48a5bf602a2adf6521982ac6aec
deleted: sha256:cc6ab4e5fc2203b455f7a8e50d4c144034a82678e637dd75e8396d74906cbd37
deleted: sha256:60a1323b3d248656242b1599764d9d25483038260d47b113388950823274cce8
deleted: sha256:5af4f8f59b764c64c6def53f52ada809fe38d528441d08d01c206dfb3fc3b691
untagged: sonarqube:latest
untagged: sonarqube@sha256:61a68c47cc7b376d899b62c3498eef41368f4b661a5efcc9ae8299ba4c3717e2
deleted: sha256:b655e16faded4a2bfdbbb2891524ed6fa1ef56aac73a88e390d313ba84638554
deleted: sha256:ef36f2714d9e1acd7594af231e2efeae0463b32f6d9c2933fba4e832f6f13264
deleted: sha256:fc6bbfc9d91eeda48651c8996a0a06b4b35ac055704f1a2600017f0ce7cec987
deleted: sha256:3e200de0e70d570804a7b2cabd4ef4ef22d24bdc8eadd78dc1a3bca0783b2afe
deleted: sha256:25c7fe2c9d2e51a07f5cd3ace2b683cf06d140b3df2917a8bd89ac1609cbe54b
deleted: sha256:4ad18e683db63043ff65e409e0899d2dd970594a25df3088fb591678773fdeb9
deleted: sha256:124ecc52b8f627a193b6ff3f60002006d405c7aed70cceb738eed95f0c4852d6
deleted: sha256:a1360aae5271bbbf575b4057cb4158dbdfbcae76698189b55fb1039bc0207400
untagged: sonarsource/sonar-scanner-cli:latest
untagged: sonarsource/sonar-scanner-cli@sha256:494ecc3b5b1ee1625bd377b3905c4284e4f0cc155cff397805a244dee1c7d575
deleted: sha256:2f384fb1bbd5f033fa0b628efb5ef3d40b9cafaddb68b9ffdd8c3cacdc237199
deleted: sha256:a0f9817d3334f4a9eec46d9048b28aede4b6f577951d20530b21c4cac99e810c
deleted: sha256:7dca3e8c077044e4b72447ca96182f53513b430bea7406f2a5df5b180a85217c
deleted: sha256:f68126c481542c04a5906a882d381daff155fbe5ae9cd3bcb1c94c2bb0d656e3
deleted: sha256:a43e85e22a1a59383c740435b0a8c58951182ab1192f5a02f5e99337c83f0297
deleted: sha256:36b50b131297b8860da51b2d2b24bb4c08dfbdf2789b08e3cc0f187c98637a19
untagged: tinywan/webman:8.2.11-cli-alpine
untagged: tinywan/webman@sha256:2431829348e0dbd3a629849f6058862c32a49d73fb8d1e839b2541c568ab1fe8
deleted: sha256:819e540de5daef4fca9a1c8a010959a4f7d19479ce84f2de6c6c0b0b03cdc183
untagged: tinywan/webman:7.4.33
untagged: tinywan/webman:7.4.33-cli-alpine
untagged: tinywan/webman@sha256:02a0dcdb39809a1f928ae6fdb6bc8959992960b608870bc291cb49a108faa459
deleted: sha256:ee679c576887cea3c6ac360e71e82307224693ed8927107007cc9043ece7e249
Deleted build cache objects:
gbkjbxnv5asof0lt8jekktdht
zmvf2anlpwtzi9knge5hoztq4
...
qixwcs8f2yfbwfoobgqdkqppz
m3uwrq0kcpjsoci7s55vodndt
Total reclaimed space: 3.654GB Prune regularly
To safely delete stopped containers, unused networks, and hanging images, it's best to run the following command frequently:
docker system prune A slightly riskier option is:
docker system prune -a This also erases any images that aren't related to the running container. This can be a bit drastic, but Docker will re-download any images it needs. The first attempt will be a little slower, but the image will then be cached for further use.
The following sections describe other ways to delete a specific item.
Image recycling
A Docker image is a disk snapshot of an application, such as a web server, a language runtime, or a database management system.
You can view all images, including active and hanging images (images that are not associated with a container), by entering the following command:
docker image ls -a above output
PS C:\Users\Tinywan> docker image ls -a
REPOSITORY TAG IMAGE ID CREATED SIZE
dnmp-php82 latest dd66a1c77f16 8 days ago 144MB
<none> <none> ef4a886609a0 8 days ago 144MB
siguremo/yutto latest 848b6463c5f0 2 months ago 199MB
sonarqube latest b655e16faded 4 months ago 725MB
registry.cn-hangzhou.aliyuncs.com/fastgpt/fastgpt latest fc9f32309c33 5 months ago 322MB
tinywan/webman 8.2.11-cli-alpine 819e540de5da 5 months ago 519MB
tinywan/webman 7.4.33 ee679c576887 5 months ago 467MB
tinywan/webman 7.4.33-cli-alpine ee679c576887 5 months ago 467MB
sonarsource/sonar-scanner-cli latest 2f384fb1bbd5 7 months ago 358MB
ankane/pgvector v0.5.0 272a4ebc8cc3 7 months ago 414MB
registry.cn-hangzhou.aliyuncs.com/fastgpt/pgvector v0.5.0 272a4ebc8cc3 7 months ago 414MB
mongo 5.0.18 6e57b03e71ef 9 months ago 663MB
dnmp-php74 latest 4bbb179d922c 10 months ago 118MB
dnmp-php81 latest ae8a7859a555 10 months ago 164MB
nacos/nacos-server v2.0.4 e6a65052d0b1 2 years ago 1.08GB
mysql 5.7 c20987f18b13 2 years ago 448MB
nginx 1.19.1-alpine ecd67fe340f9 3 years ago 21.6MB
redis 5.0.3-alpine 3d2a373f46ae 5 years ago 50.8MB You can delete a Docker image by entering the following command:
docker image rm <name_or_id> This command can add as many images as you want - separating them with space characters.
Clean containers
A Docker container is a running instance of an image that can launch any number of containers from the same container. Containers are usually small because they are stateless and reference the file system of the image.
View all running and stopped containers by entering the following command:
docker container ls -a output
2e34f69318d5 dnmp-php82 "docker-php-entrypoi…" 8 days ago Up 4 days 0.0.0.0:8217-8219->8217-8219/tcp, 9000/tcp dnmp-php82
e4b8790a4261 mysql:5.7 "docker-entrypoint.s…" 8 days ago Up 7 days 33060/tcp, 0.0.0.0:3308->3306/tcp dnmp-mysql
f72371006617 redis:5.0.3-alpine "docker-entrypoint.s…" 8 days ago Up 7 days 0.0.0.0:6379->6379/tcp dnmp-redis
07b8e0f5ae2f nacos/nacos-server:v2.0.4 "bin/docker-startup.…" 8 days ago Up 7 days 0.0.0.0:8848->8848/tcp dnmp-nacos You can only delete a container after it has been stopped. Stop the container by entering the following command:
docker container stop <name_or_id> The container can then be deleted by entering:
docker container rm <name_or_id> Again, you can add any number of space-separated container names/IDs to the command.
It is rarely necessary to keep a stopped container. The --rm option can be added to any docker run command to automatically delete the container when it is terminated.
Web decluttering
Containers can connect to a network managed by Docker so that they can communicate with each other. These profiles don't take up much disk space.
View all Docker networks by entering the following command:
docker network ls output
docker network ls
NETWORK ID NAME DRIVER SCOPE
35fda7ee3e2a bridge bridge local
b74f4cb017bd dnmp_backend bridge local
4ebabd0f89b7 host host local
6bf66e897e96 none null local
fbf2f368ddd6 tinywan-fastgpt_fastgpt bridge local Enter the following command to delete one or more unused networks:
docker network rm <name_or_id> Again, you can add any number of space-separated network names/IDs to this command.
Data volume optimization
A Docker volume is a virtual disk image. It must be attached to a running container in order to save files or other state information between reboots. The size of a volume depends on the application that uses it, but a typical database will require a few hundred megabytes of space, even if it is mostly empty.
View all Docker-managed disk volumes by entering the following command:
docker volume ls Deleting a Docker volume will delete its data forever!
If you're developing a database-driven application, it's often feasible to keep one or more data dumps that can be used to recreate a specific set of records. Most database client tools offer dump or export capabilities, such as the Export link in Adminer.
Most database systems provide backup tools, such as the mysqldump utility in MySQL. These can be executed using the docker exec command on the running container.
The following Linux/macOS command backs up a MySQL database named mydb running on a container named mysql to a file named backup.sql. Use MySQL root user and password mysecret:
docker exec mysql /usr/bin/mysqldump -u root -pmysecret mydb \
> backup.sql Windows PowerShell的等效命令：
docker exec mysql /usr/bin/mysqldump -u root -pmysecret -r mydb | \
Set-Content backup.sql You can also use the docker cp command to copy the data file to or from a running container. This is the source and destination path that is passed, where the container is referenced by its name/ID followed by a colon and path, for example.
docker cp mycontainer:/some/file ./host/directory Assuming your data is safe, you can delete any unused volumes by entering the following command:
docker volume rm <name> All unused Docker volumes (volumes that are not currently connected to a running container) can be deleted in the following ways:
docker volume prune Full cleanup starts
Every unused container, image, volume, and network can be wiped with a single command:
docker system prune -a --volumes If you want to force a wipe without a confirmation prompt, add -f. Your system will revert back to its original state without any Docker data.