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README
Apache-2.0

image-syncer

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image-syncer 是一个docker镜像同步工具,可用来进行多对多的镜像仓库同步,支持目前绝大多数主流的docker镜像仓库服务

English | 简体中文

Features

  • 支持多对多镜像仓库同步
  • 支持基于Docker Registry V2搭建的docker镜像仓库服务 (如 Docker Hub、 Quay、 阿里云镜像服务ACR、 Harbor等)
  • 同步只经过内存和网络,不依赖磁盘存储,同步速度快
  • 增量同步, 通过对同步过的镜像blob信息落盘,不重复同步已同步的镜像
  • 并发同步,可以通过配置文件调整并发数
  • 自动重试失败的同步任务,可以解决大部分镜像同步中的网络抖动问题
  • 不依赖docker以及其他程序

使用

下载和安装

releases页面可下载源码以及二进制文件

手动编译

go get github.com/AliyunContainerService/image-syncer
cd $GOPATH/github.com/AliyunContainerService/image-syncer

# This will create a binary file named image-syncer
make

使用用例

# 获得帮助信息
./image-syncer -h

# 设置配置文件为config.json,默认registry为registry.cn-beijing.aliyuncs.com
# 默认namespace为ruohe,并发数为6
./image-syncer --proc=6 --auth=./auth.json --images=./images.json --namespace=ruohe \
--registry=registry.cn-beijing.aliyuncs.com --retries=3

配置文件

在 v1.2.0 版本之后,image-syncer 的配置文件支持JSON和YAML两种格式,并且支持将原config文件替换为一个认证信息文件和一个镜像同步文件。详细的配置文件示例可在目录 example 下找到,旧版本的配置文件格式(auth 和 images 字段放在一起的版本,通过 --config 参数指定)也是兼容的,目录下 config.json 为示例。

认证信息

auth.json 包含了所有仓库的认证信息

{  
    // 认证字段,其中每个对象为一个registry的一个账号和
    // 密码;通常,同步源需要具有pull以及访问tags权限,
    // 同步目标需要拥有push以及创建仓库权限,如果没有提供,则默认匿名访问
    
    "quay.io": {    // 支持 "registry" 和 "registry/namespace"(v1.0.3之后的版本) 的形式,需要跟下面images中的registry(registry/namespace)对应
                    // images中被匹配到的的url会使用对应账号密码进行镜像同步, 优先匹配 "registry/namespace" 的形式
        "username": "xxx",               // 用户名,可选,(v1.3.1 之后支持)valuse 使用 "${env}" 或者 "$env" 类型的字符串可以引用环境变量
        "password": "xxxxxxxxx",         // 密码,可选,(v1.3.1 之后支持)valuse 使用 "${env}" 或者 "$env" 类型的字符串可以引用环境变量
        "insecure": true                 // registry是否是http服务,如果是,insecure 字段需要为true,默认是false,可选,支持这个选项需要image-syncer版本 > v1.0.1
    },
    "registry.cn-beijing.aliyuncs.com": {
        "username": "xxx",
        "password": "xxxxxxxxx"
    },
    "registry.hub.docker.com": {
        "username": "xxx",
        "password": "xxxxxxxxxx"
    },
    "quay.io/coreos": {                       
        "username": "abc",              
        "password": "xxxxxxxxx",
        "insecure": true  
    }
}

镜像同步文件

{
    // 同步镜像规则字段,其中条规则包括一个源仓库(键)和一个目标仓库(值)
    
    // 同步的最大单位是仓库(repo),不支持通过一条规则同步整个namespace以及registry
    
    // 源仓库和目标仓库的格式与docker pull/push命令使用的镜像url类似(registry/namespace/repository:tag)
    // 源仓库和目标仓库(如果目标仓库不为空字符串)都至少包含registry/namespace/repository
    // 源仓库字段不能为空,如果需要将一个源仓库同步到多个目标仓库需要配置多条规则
    // 目标仓库名可以和源仓库名不同(tag也可以不同),此时同步功能类似于:docker pull + docker tag + docker push

    "quay.io/coreos/kube-rbac-proxy": "quay.io/ruohe/kube-rbac-proxy",
    "xxxx":"xxxxx",
    "xxx/xxx/xx:tag1,tag2,tag3":"xxx/xxx/xx"

    // 当源仓库字段中不包含tag时,表示将该仓库所有tag同步到目标仓库,此时目标仓库不能包含tag
    // 当源仓库字段中包含tag时,表示只同步源仓库中的一个tag到目标仓库,如果目标仓库中不包含tag,则默认使用源tag
    // 源仓库字段中的tag可以同时包含多个(比如"a/b/c:1,2,3"),tag之间通过","隔开,此时目标仓库不能包含tag,并且默认使用原来的tag
    
    // 当目标仓库为空字符串时,会将源镜像同步到默认registry的默认namespace下,并且repo以及tag与源仓库相同,默认registry和默认namespace可以通过命令行参数以及环境变量配置,参考下面的描述
}

更多参数

image-syncer 的使用比较简单,但同时也支持多个命令行参数的指定:

-h  --help       使用说明,会打印出一些启动参数的当前默认值
   
    --config     设置用户提供的配置文件路径,使用之前需要创建此文件,默认为当前工作目录下的config.json文件。这个参数与 --auth和--images 的
                 作用相同,分解成两个参数可以更好地区分认证信息与镜像仓库同步规则。建议使用 --auth 和 --images.

    --auth       设置用户提供的认证文件所在路径,使用之前需要创建此认证文件,默认为当前工作目录下的auth.json文件

    --images     设置用户提供的镜像同步规则文件所在路径,使用之前需要创建此文件,默认为当前工作目录下的images.json文件

    --log        打印出来的log文件路径,默认打印到标准错误输出,如果将日志打印到文件将不会有命令行输出,此时需要通过cat对应的日志文件查看

    --namespace  设置默认的目标namespace,当配置文件内一条images规则的目标仓库为空,并且默认registry也不为空时有效,可以通过环境变量DEFAULT_NAMESPACE设置,同时传入命令行参数会优先使用命令行参数值

    --registry   设置默认的目标registry,当配置文件内一条images规则的目标仓库为空,并且默认namespace也不为空时有效,可以通过环境变量DEFAULT_REGISTRY设置,同时传入命令行参数会优先使用命令行参数值

    --proc       并发数,进行镜像同步的并发goroutine数量,默认为5

    --records    指定传输过程中保存已传输完成镜像信息(blob)的文件输出/读取路径,默认输出到当前工作目录,一个records记录了对应目标仓库的已迁移信息,可以用来进行连续的多次迁移(会节约大量时间,但不要把之前自己没执行过的records文件拿来用),如果有unknown blob之类的错误,可以删除该文件重新尝试,image-syncer 在 >= v1.1.0 版本中移除了对于records文件的依赖

    --retries    失败同步任务的重试次数,默认为2,重试会在所有任务都被执行一遍之后开始,并且也会重新尝试对应次数生成失败任务的生成。一些偶尔出现的网络错误比如io timeout、TLS handshake timeout,都可以通过设置重试次数来减少失败的任务数量

    --os         用来过滤源 tag 的 os 列表,为空则没有任何过滤要求,只对非 docker v2 schema1 media 类型的镜像格式有效

    --arch       用来过滤源 tag 的 architecture 列表,为空则没有任何过滤要求

FAQs

同步中常见的问题汇总在FAQs文档

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阿里云镜像仓库同步工具 展开 收起
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