CentOS7.2服务器上搭建Docker私有镜像仓库操作示例

本文实例讲述了CentOS7.2服务器上搭建Docker私有镜像仓库操作。分享给大家供大家参考，具体如下：

鉴于国内pull镜像的速度较慢，很有必要搭建docker私有或者本地镜像仓库。

安装docker

# yum -y install docker
# systemctl start docker && systemctl enable docker

使用自签名进行安全认证

创建存放证书和密钥的certs目录

# mkdir -p /docker/certs
# chcon -Rt svirt_sandbox_file_t /docker/certs/

修改/etc/pki/tls/openssl.cnf配置文件

在该文件的[ v3_ca ]配置项中添加镜像仓库IP地址：

[ v3_ca ]
# Extensions for a typical CA
subjectAltName = IP:192.168.120.128

生成证书和密钥

# cd /docker && openssl req 
-newkey rsa:4096 -nodes -sha256 -keyout certs/domain.key 
-x509 -days 365 -out certs/domain.crt
# mkdir -p /etc/docker/certs.d/192.168.120.128:5000/
# cp certs/domain.crt /etc/docker/certs.d/192.168.120.128:5000/ca.crt

创建存放镜像文件的后端存储

# mkdir -p /docker/data/private_registry
# chcon -Rt svirt_sandbox_file_t /docker/data/private_registry

重新启动docker daemon

# systemctl restart docker

启动私有镜像仓库

# docker run 
-d 
--name private_registry --restart=always 
-u root 
-p 5000:5000 
-v /docker/data/private_registry:/var/lib/registry 
-v /docker/certs:/certs 
-e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/domain.crt 
-e REGISTRY_HTTP_TLS_KEY=/certs/domain.key 
registry:2

Docker加速器

该加速器可在pull镜像较慢时配置实用。

# curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://c282dc88.m.daocloud.io

测试

本地测试

# docker pull ubuntu
# docker tag ubuntu 192.168.120.128:5000/ubuntu
# docker pull 192.168.120.128:5000/ubuntu
Using default tag: latest
Trying to pull repository 192.168.120.128:5000/ubuntu ...
latest: Pulling from 192.168.120.128:5000/ubuntu
Digest: sha256:382452f82a8bbd34443b2c727650af46aced0f94a44463c62a9848133ecb1aa8

远程测试

在另一台主机上执行以下命令进行测试：

# mkdir -p /etc/docker/certs.d/192.168.120.128:5000/
# scp 192.168.120.128:/etc/docker/certs.d/192.168.120.128:5000/ca.crt /etc/docker/certs.d/192.168.120.128:5000/
# systemctl restart docker
# docker pull 192.168.120.128:5000/ubuntu
Using default tag: latest
Trying to pull repository 192.168.120.128:5000/ubuntu ...
latest: Pulling from 192.168.120.128:5000/ubuntu
b6f892c0043b: Pull complete
55010f332b04: Pull complete
2955fb827c94: Pull complete
3deef3fcbd30: Pull complete
cf9722e506aa: Pull complete
Digest: sha256:382452f82a8bbd34443b2c727650af46aced0f94a44463c62a9848133ecb1aa8

希望本文所述对大家Docker容器使用有所帮助。