查看docker镜像的保存目录

使用命令 docker info | grep "Docker Root Dir"，可以发现默认的根目录是/var/lib/docker

[root@k8s-master ~]# docker info | grep "Docker Root Dir"
  WARNING: You're not using the default seccomp profile
WARNING: IPv4 forwarding is disabled
Docker Root Dir: /var/lib/docker
[root@k8s-master ~]#

查看容器使用的镜像位置

使用命令docker insepct <name>，查看GraphDriver字段，发现镜像位置在/var/lib/docker/overlay2

[root@k8s-master ~]# docker ps
CONTAINER ID        IMAGE                    COMMAND                  CREATED             STATUS              PORTS                    NAMES
503793d093e2        docker.io/redis:latest   "docker-entrypoint..."   14 months ago       Up 44 seconds       0.0.0.0:6379->6379/tcp   redis
[root@k8s-master ~]#
[root@k8s-master ~]#
[root@k8s-master ~]# docker inspect 50 | jq .[0]."GraphDriver"
{
  "Name": "overlay2",
  "Data": {
    "LowerDir": "/var/lib/docker/overlay2/f86daaea7cd166672a7b6fd03454d20d1bd263b3ed1d6a9b1a63453474bc394b-init/diff:/var/lib/docker/overlay2/cc2d0f782e8cd77dac73b0a8e98db0ac0a9d3cf51d33b37e0d25ea524d19e592/diff:/var/lib/docker/overlay2/fda077c50a0a7ae718ff9ec43ebcc46e06ca3b1d5d29314c5052d0d273f6a066/diff:/var/lib/docker/overlay2/c045676a24afecd5f16c6adcdefb5ee6f39e4fcbfc29cd59070ff5101715a9cb/diff:/var/lib/docker/overlay2/60956264b48bea4615baeb1a475c986a812384833ca77e628c78ad04c3081544/diff:/var/lib/docker/overlay2/5d157d02fa408326164bdcbdb79043a153949bfe6e8d0855c42f6175c18ee554/diff:/var/lib/docker/overlay2/615d8ec38f63cdea2fb283cdb02facb962f7d0ede983b7bd9eb612d7576cf690/diff",
    "MergedDir": "/var/lib/docker/overlay2/f86daaea7cd166672a7b6fd03454d20d1bd263b3ed1d6a9b1a63453474bc394b/merged",
    "UpperDir": "/var/lib/docker/overlay2/f86daaea7cd166672a7b6fd03454d20d1bd263b3ed1d6a9b1a63453474bc394b/diff",
    "WorkDir": "/var/lib/docker/overlay2/f86daaea7cd166672a7b6fd03454d20d1bd263b3ed1d6a9b1a63453474bc394b/work"
  }
}
[root@k8s-master ~]#

查看镜像列表

1、docker images

[root@k8s-master ~]# docker images
REPOSITORY                                                            TAG                 IMAGE ID            CREATED             SIZE
docker.io/mysql                                                       latest              562c9bc24a08        15 months ago       521 MB
docker.io/redis                                                       latest              87c26977fd90        15 months ago       113 MB
gorestful                                                             nocmd               1d52d9037493        22 months ago       12.2 MB
gorestful                                                             v1.1                a8bc12a7d372        22 months ago       12.2 MB
gorestful                                                             v1                  c7cfe51cbb6a        22 months ago       12.3 MB
docker.io/alpine                                                      latest              021b3423115f        22 months ago       5.6 MB
registry.aliyuncs.com/google_containers/kube-apiserver                v1.21.2             106ff58d4308        24 months ago       126 MB
registry.aliyuncs.com/google_containers/kube-controller-manager       v1.21.2             ae24db9aa2cc        24 months ago       120 MB
registry.aliyuncs.com/google_containers/kube-proxy                    v1.21.2             a6ebd1c1ad98        24 months ago       131 MB
registry.aliyuncs.com/google_containers/kube-scheduler                v1.21.2             f917b8c8f55b        24 months ago       50.6 MB
docker.io/kong/kubernetes-ingress-controller                          latest              dc5696e34b98        2 years ago         80.3 MB
quay.io/coreos/flannel                                                v0.14.0             8522d622299c        2 years ago         67.9 MB
registry.aliyuncs.com/google_containers/pause                         3.4.1               0f8457a4c2ec        2 years ago         683 kB
docker.io/coredns/coredns                                             1.8.0               296a6d5035e2        2 years ago         42.5 MB
registry.aliyuncs.com/google_containers/coredns/coredns               v1.8.0              296a6d5035e2        2 years ago         42.5 MB
registry.aliyuncs.com/google_containers/coredns                       v1.8.0              296a6d5035e2        2 years ago         42.5 MB
registry.cn-hangzhou.aliyuncs.com/google_containers/coredns/coredns   v1.8.0              296a6d5035e2        2 years ago         42.5 MB
registry.aliyuncs.com/google_containers/etcd                          3.4.13-0            0369cf4303ff        2 years ago         253 MB
registry.cn-hangzhou.aliyuncs.com/yilong/ingress-test                 web1                dd59ebb7e0d6        2 years ago         211 MB
[root@k8s-master ~]#

2、cat /var/lib/docker/image/overlay2/repositories.json 对应docker images查到的镜像

[root@k8s-master ~]# cat /var/lib/docker/image/overlay2/repositories.json  | jq .
{
  "Repositories": {
    "docker.io/alpine": {
      "docker.io/alpine:latest": "sha256:021b3423115ff662225e83d7e2606475217de7b55fde83ce3447a54019a77aa2",
      "docker.io/alpine@sha256:eb3e4e175ba6d212ba1d6e04fc0782916c08e1c9d7b45892e9796141b1d379ae": "sha256:021b3423115ff662225e83d7e2606475217de7b55fde83ce3447a54019a77aa2"
    },
    "docker.io/coredns/coredns": {
      "docker.io/coredns/coredns:1.8.0": "sha256:296a6d5035e2d6919249e02709a488d680ddca91357602bd65e605eac967b899",
      "docker.io/coredns/coredns@sha256:cc8fb77bc2a0541949d1d9320a641b82fd392b0d3d8145469ca4709ae769980e": "sha256:296a6d5035e2d6919249e02709a488d680ddca91357602bd65e605eac967b899"
    },
    "docker.io/kong/kubernetes-ingress-controller": {
      "docker.io/kong/kubernetes-ingress-controller:latest": "sha256:dc5696e34b98b3e7c43d49a233824598358fe86292617fcd95c85781de8bd89e",
      "docker.io/kong/kubernetes-ingress-controller@sha256:6d7e1f96c7bbe1d52bc0369b7042ab0fa1cd2ff80792ba2e94c04a5dbe50838a": "sha256:dc5696e34b98b3e7c43d49a233824598358fe86292617fcd95c85781de8bd89e"
    },
    "docker.io/mysql": {
      "docker.io/mysql:latest": "sha256:562c9bc24a0883226e994aabbd09fcb5621a4eadb510df749bc6dac40fa991e3",
      "docker.io/mysql@sha256:b2ae0f527005d99bacdf3a220958ed171e1eb0676377174f0323e0a10912408a": "sha256:562c9bc24a0883226e994aabbd09fcb5621a4eadb510df749bc6dac40fa991e3"
    },
...(等等)