我要评论一、阿里云镜像库mirrors.aliyun.com无法访问centos6源问题
阿里云的开源镜像站地址： https://mirrors.aliyun.com/repo/ 在里面可以看到还有centos-6.repo的repo包，但下载下来执行源更新会遇到问题
后面的其它地址也一样会请求超时。
[root@04007 ~]# cat centos-6.repo
[base]
name=centos-$releasever - base - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
http://mirrors.aliyuncs.com/centos/$releasever/os/$basearch/
http://mirrors.cloud.aliyuncs.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/rpm-gpg-key-centos-6
#released updates
[updates]
name=centos-$releasever - updates - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
http://mirrors.aliyuncs.com/centos/$releasever/updates/$basearch/
http://mirrors.cloud.aliyuncs.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/rpm-gpg-key-centos-6
[root@04007 yum.repos.d]# yum makecache
loaded plugins: security
http://mirrors.aliyun.com/centos/6/os/x86_64/repodata/repomd.xml: [errno 14] pycurl error 22 - "the requested url returned error: 404 not found"
trying other mirror.
to address this issue please refer to the below wiki article
https://wiki.centos.org/yum-errors
if above article doesn't help to resolve this issue please use https://bugs.centos.org/.
http://mirrors.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: [errno 14] pycurl error 22 - "the requested url returned error: 404 not found"
trying other mirror.
http://mirrors.cloud.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: [errno 12] timeout on http://mirrors.cloud.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: (28, 'connection timed out after 3000 milliseconds')
trying other mirror.
error: cannot retrieve repository metadata (repomd.xml) for repository: base. please verify its path and try againmirrors.aliyun.com镜像中 http://mirrors.aliyun.com/centos/6/os/x86_64/repodata/repomd.xml: 这些地址都无法访问。阿里云在centos镜像站（地址：https://developer.aliyun.com/mirror/centos?spm=a2c6h.13651102.0.0.3e221b1133l0lm ）中也提到centos6（centos6官方源已下线，建议切换centos-vault源）。
因为centos在有新版本后就会结束对老版本的系统支持，因此对应的yum源也失效了，centos官方提供http://vault.centos.org/ 包含了所有发行的centos版本，因此需要将yum源修改为centos-vault的源。
因此导致yum update报错，无法访问centos6源。可以将上面centos-6.repo文件中的 http://mirrors.aliyun.com/ 都换成https://vault.centos.org即可。包括baseurl和gpgkey这两行。如还会报错试着将$releasever替换为当前系统所使用的centos版本。
对比如下：
二、docker安装官方milvus2.0镜像太慢
在docker下安装milvus2.0的步骤并不多，官方文档地址：https://milvus.io/docs/v2.0.x/install_standalone-docker.md 先下载docker-compose.yml文件，然后设置docker_volume_directory的值执行docker-compose安装即可。但在执行下载镜像的时候太慢了。
root@testmc:~/# wget https://raw.githubusercontent.com/milvus-io/milvus/master/deployments/docker/standalone/docker-compose.yml -o docker-compose.yml
root@testmc:~/# docker_volume_directory=/disk
root@testmc:~/# docker-compose up -d默认从docker远端镜像仓库中拉取镜像，真的是非常慢。有推荐使用国内daocloud镜像加速器，如下方法使用脚本将 --registry-mirror 加入到docker配置文件 /etc/docker/daemon.json中。但使用daocloud镜像地址依然很慢，下载个镜像半天不动，最后是用了阿里云 docker 加速拉取镜像（ubuntu）在下载etcd和minio的时候快很多，但在下载milvus依然还是很慢。
#使用国内daocloud镜像
root@testmc:~/# curl -ssl https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://d1d9aef0.m.daocloud.io
docker version >= 1.12
success.
#使用aliyuncs.com镜像
root@testmc:~/# sudo tee /etc/docker/daemon.json <<-'eof'
{
"registry-mirrors": ["https://ijwtmjl5.mirror.aliyuncs.com"]
}
eof
sudo systemctl daemon-reload
sudo systemctl restart docker
root@testmc:~/# docker-compose up -d
starting milvus-etcd ... done
starting milvus-minio ... done
starting milvus-standalone ... done
root@testmc:~/# docker-compose ps
root@testmc:~/# docker-compose down另外在直接使用下载下来的docker-compose.yml进行安装的时候会碰到一些报错和解决方法，如下：
#更新镜像源解决
error: error pulling image configuration: get https://production.cloudflare.docker.com net/http: tls handshake timeout
error: the compose file './docker-compose.yml' is invalid because:
networks.default value additional properties are not allowed ('name' was unexpected)
error pulling image configuration: get https://production.cloudflare.docker.com/registry-v2/docker/registry/v2/blobs/sha256/f9/..: net/http: tls handshake timeout
#注释掉docker-compose.yml中的netword那几行。
nsupported config option for services.minio: 'healthcheck'
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