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Update demo image version
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network/dns.md

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@@ -27,7 +27,7 @@ tmpfs on /etc/resolv.conf type tmpfs ...
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这样每次启动的容器 DNS 自动配置为 `114.114.114.114``8.8.8.8`。使用以下命令来证明其已经生效。
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```bash
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$ docker run -it --rm ubuntu:17.10 cat etc/resolv.conf
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$ docker run -it --rm ubuntu:18.04 cat etc/resolv.conf
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nameserver 114.114.114.114
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nameserver 8.8.8.8

repository/registry_auth.md

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@@ -182,23 +182,23 @@ $ docker login docker.domain.com
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尝试推送、拉取镜像。
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```bash
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$ docker pull ubuntu:17.10
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$ docker pull ubuntu:18.04
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$ docker tag ubuntu:17.10 docker.domain.com/username/ubuntu:17.10
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$ docker tag ubuntu:18.04 docker.domain.com/username/ubuntu:18.04
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$ docker push docker.domain.com/username/ubuntu:17.10
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$ docker push docker.domain.com/username/ubuntu:18.04
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$ docker image rm docker.domain.com/username/ubuntu:17.10
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$ docker image rm docker.domain.com/username/ubuntu:18.04
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$ docker pull docker.domain.com/username/ubuntu:17.10
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$ docker pull docker.domain.com/username/ubuntu:18.04
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```
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如果我们退出登录,尝试推送镜像。
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```bash
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$ docker logout docker.domain.com
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$ docker push docker.domain.com/username/ubuntu:17.10
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$ docker push docker.domain.com/username/ubuntu:18.04
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no basic auth credentials
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```

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