DOCKER 从入门到放弃（二）

搜索镜像

从docker官方镜像仓库搜索镜像

docker search [OPTIONS] TERM

OPTIONS:

--automated ：只显示自动创建的镜像，默认值为fasle

--filter，-f ：显示过滤后的搜索结果

--limit ：显示的最大搜索结果，默认值为25

--no-trunc : 显示完整的镜像描述，默认值为fasle

--stars ：列出收藏数不小于指定值的镜像，默认值为0

搜索ubuntu镜像

[root@docker ~]# docker search ubuntu
NAME                                         DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
ubuntu                                       Ubuntu is a Debian-based Linux operating s...   6198      [OK]
rastasheep/ubuntu-sshd                       Dockerized SSH service, built on top of of...   90                   [OK]
ubuntu-upstart                               Upstart is an event-based replacement for ...   74        [OK]
ubuntu-debootstrap                           debootstrap --variant=minbase --components...   30        [OK]
torusware/speedus-ubuntu                     Always updated official Ubuntu docker imag...   28                   [OK]
nuagebec/ubuntu                              Simple always updated Ubuntu docker images...   22                   [OK]
nickistre/ubuntu-lamp                        LAMP server on Ubuntu                           20                   [OK]
solita/ubuntu-systemd                        Ubuntu + systemd                                8                    [OK]
nimmis/ubuntu                                This is a docker images different LTS vers...   7                    [OK]
darksheer/ubuntu                             Base Ubuntu Image -- Updated hourly             3                    [OK]
vcatechnology/ubuntu                         A Ubuntu image that is updated daily            1                    [OK]
webhippie/ubuntu                             Docker images for ubuntu                        1                    [OK]
jordi/ubuntu                                 Ubuntu Base Image                               1                    [OK]
admiringworm/ubuntu                          Base ubuntu images based on the official u...   1                    [OK]
konstruktoid/ubuntu                          Ubuntu base image                               0                    [OK]
forumi0721ubuntuaarch64/ubuntu-aarch64-dev   ubuntu-aarch64-dev                              0                    [OK]
labengine/ubuntu                             Images base ubuntu                              0                    [OK]
forumi0721ubuntuarmhf/ubuntu-armhf-dev       ubuntu-armhf-dev                                0                    [OK]
forumi0721ubuntux64/ubuntu-x64-dev-armbian   ubuntu-x64-dev-armbian                          0                    [OK]
forumi0721ubuntux64/ubuntu-x64-dev-android   ubuntu-x64-dev-android                          0                    [OK]
teamrock/ubuntu                              TeamRock's Ubuntu image configured with AW...   0                    [OK]
smartentry/ubuntu                            ubuntu with smartentry                          0                    [OK]
datenbetrieb/ubuntu                          custom flavor of the official ubuntu base ...   0                    [OK]
lynxtp/ubuntu                                https://github.com/lynxtp/docker-ubuntu         0                    [OK]
forumi0721ubuntux64/ubuntu-x64-dev           ubuntu-x64-dev                                  0                    [OK]

搜索busybox官方镜像。并且stars数不少于3的镜像

[root@docker ~]# docker search --filter "is-official=true" --filter "stars=3" busybox
NAME      DESCRIPTION           STARS     OFFICIAL   AUTOMATED
busybox   Busybox base image.   1044      [OK]       

镜像下载

从镜像仓库下载镜像，不指定仓库的地址将默认从Docker Hub官方仓库下载镜像

不指定镜像的tag将下载默认latest镜像

docker pull [OPTIONS] NAME[:TAG|@DIGEST]

从docker官方镜像仓库下载nginx镜像

[root@docker yum.repos.d]# docker pull nginx
Using default tag: latest
latest: Pulling from library/nginx
e6e142a99202: Pull complete
8c317a037432: Pull complete
af2ddac66ed0: Pull complete
Digest: sha256:72c7191585e9b79cde433c89955547685db00f3a8595a750339549f6acef7702
Status: Downloaded newer image for nginx:latest

从指定的镜像仓库192.168.0.180/pan 下载镜像

[root@docker ~]# docker pull 192.168.0.180/pan/pod
Using default tag: latest
latest: Pulling from pan/pod
5a865e48f2fd: Pull complete
a778b52f148e: Pull complete
8d6f83433b16: Pull complete
Digest: sha256:a542e98ed123fbba93b820b896d5f563f003bf07b59d5943b591a10f16ce1211
Status: Downloaded newer image for 192.168.0.180/pan/pod:latest

下载碰到的问题：

如果私有仓库未开启https连接，docker默认使用https连接镜像仓库将导致无法下载镜像，编辑文件/etc/docker/daemon.json将私有仓库添加为可信任仓库，没有该文件可手动创建

vi /etc/docker/daemon.json
{
  "insecure-registries" : ["192.168.0.180"]
}

如果docker版本太低，此方法无用，则编辑/etc/sysconfig/docker文件，添加可信任仓库

vi  /etc/sysconfig/docker
INSECURE_REGISTRY='--insecure-registry 192.168.0.180'

镜像操作

查看本地镜像

[root@docker ~]# docker images
REPOSITORY              TAG                 IMAGE ID            CREATED             SIZE
nginx                   latest              c246cd3dd41d        9 days ago          107MB
192.168.0.180/pan/pod   latest              be92a7c78132        6 weeks ago         205MB

导出本地镜像

镜像下载到本地后存放在分层文件系统中，实用docker save命令可以将其导入到一个普通文件中

[root@docker ~]# docker save -o /root/nginx-img.tar nginx
[root@docker ~]# file /root/nginx-img.tar
/root/nginx-img.tar: POSIX tar archive
[root@docker ~]# ll -h /root/nginx-img.tar
-rw------- 1 root root 107M Jul  2 23:59 /root/nginx-img.tar

导入本地镜像

将导出的镜像文件导入到本地镜像库

[root@docker ~]# docker load --input nginx-img.tar
54522c622682: Loading layer [==================================================>]  58.44MB/58.44MB
1c3fae42c500: Loading layer [==================================================>]   52.7MB/52.7MB
87823f21b793: Loading layer [==================================================>]  3.584kB/3.584kB
Loaded image: nginx:latest

上传镜像到私有镜像仓库

1. 登录镜像仓库

[root@docker ~]# docker login 192.168.0.180
Username: admin
Password:
Login Succeeded

1. 将镜像打一个新的标记

[root@docker ~]# docker tag c246cd3dd41d 192.168.0.180/pan/test
[root@docker ~]# docker images
REPOSITORY               TAG                 IMAGE ID            CREATED             SIZE
192.168.0.180/pan/test   latest              c246cd3dd41d        9 days ago          107MB
nginx                    latest              c246cd3dd41d        9 days ago          107MB
192.168.0.180/pan/pod    latest              be92a7c78132        6 weeks ago         205MB

1. 上传镜像到192.168.0.180私有镜像仓库

[root@docker ~]# docker push 192.168.0.180/pan/test
The push refers to a repository [192.168.0.180/pan/test]
87823f21b793: Pushed
1c3fae42c500: Pushed
54522c622682: Pushed
latest: digest: sha256:72c7191585e9b79cde433c89955547685db00f3a8595a750339549f6acef7702 size: 948

关于私有镜像仓库的创建后面文章会介绍。

删除镜像

删除本地镜像库中的镜像

[root@docker ~]# docker rmi nginx
Untagged: nginx:latest
Untagged: nginx@sha256:72c7191585e9b79cde433c89955547685db00f3a8595a750339549f6acef7702
Deleted: sha256:c246cd3dd41d35f9deda43609cdeaa9aaf04d3658f9c5e38aad25c4ea5efee10
Deleted: sha256:faff6e89a68845db6912629dd8b5647545f9198c5e312327a853508f25398c4d
Deleted: sha256:17634c028290a76bf93f15b178f7534cca4a38aede119fa760e319019a7bf9c7
Deleted: sha256:54522c622682789028c72c5ba0b081d42a962b406cbc1eb35f3175c646ebf4dc

如果镜像创建了容器，将无法删除该镜像，删除容器后在删除该镜像