如何在国内优雅地使用Rancher

时间：2020-05-13 13:57:55 阅读：988 评论：0 收藏：0 [点我收藏+]

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本文来源Rancher Labs

Rancher进入中国已经4年，并在今年2月份完成了中国本土化和国产化。作为一款开源的企业级Kubernetes管理平台，我们一直十分关注Rancher社区用户的各种诉求。在我们的技术社区中，我们常常收到这样的抱怨：从Github上下载资源慢、拉镜像十分耗时、无法使用library和system-library等。这些大大降低了国内用户的Rancher使用体验。

ksd@Hailong-MacBook-Pro  /tmp  wget https://github.com/rancher/rke/releases/download/v1.0.8/rke_linux-amd64
--2020-05-07 10:20:30--  https://github.com/rancher/rke/releases/download/v1.0.8/rke_linux-amd64
Resolving github.com... 13.250.177.223
Connecting to github.com|13.250.177.223|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://github-production-release-asset-2e65be.s3.amazonaws.com/108337180/26415380-8ebd-11ea-834a-af693358e976?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200507%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200507T022031Z&X-Amz-Expires=300&X-Amz-Signature=f4659696f17f619d1d42bfc0a78d998c12c34506475983eb523f150a22a4ce51&X-Amz-SignedHeaders=host&actor_id=0&repo_id=108337180&response-content-disposition=attachment%3B%20filename%3Drke_linux-amd64&response-content-type=application%2Foctet-stream [following]
--2020-05-07 10:20:31--  https://github-production-release-asset-2e65be.s3.amazonaws.com/108337180/26415380-8ebd-11ea-834a-af693358e976?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200507%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200507T022031Z&X-Amz-Expires=300&X-Amz-Signature=f4659696f17f619d1d42bfc0a78d998c12c34506475983eb523f150a22a4ce51&X-Amz-SignedHeaders=host&actor_id=0&repo_id=108337180&response-content-disposition=attachment%3B%20filename%3Drke_linux-amd64&response-content-type=application%2Foctet-stream
Resolving github-production-release-asset-2e65be.s3.amazonaws.com... 52.216.65.240
Connecting to github-production-release-asset-2e65be.s3.amazonaws.com|52.216.65.240|:443... failed: Operation timed out.
Retrying.

无法从Github上下载Rancher资源

技术图片

拉取镜像慢，等待集群启动时间长

2020/05/07 03:06:27 [INFO] Pulling image [rancher/rke-tools:v0.1.56] on host [172.17.206.119], try #1
2020/05/07 03:09:16 [INFO] Pulling image [rancher/hyperkube:v1.17.5-rancher1] on host [172.17.206.119], try #1
2020/05/07 03:09:16 [INFO] cluster [c-zfz4g] provisioning: Pre-pulling kubernetes images

拉取rancher镜像常常出现timeout情况

技术图片

无法使用library和system-library，导致无法使用应用商店

2020/05/07 03:31:31 [ERROR] CatalogController helm3-library [catalog] failed with : Remote commit check failed: Repo [https://git.rancher.io/helm3-charts] is not accessible: Get https://git.rancher.io/repos/helm3-charts/commits/master: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
2020/05/07 03:31:33 [ERROR] CatalogController library [catalog] failed with : Remote commit check failed: Repo [https://git.rancher.io/charts] is not accessible: Get https://git.rancher.io/repos/charts/commits/master: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
2020/05/07 03:31:34 [ERROR] CatalogController system-library [catalog] failed with : Remote commit check failed: Repo [https://git.rancher.io/system-charts] is not accessible: Get https://git.rancher.io/repos/system-charts/commits/release-v2.4: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

rancher/rancher日志，显示一些关于git.rancher.io timeout的错误日志

为了改善大家的使用体验，我们针对以上问题分别提出了解决方法。

优雅地使用Rancher

为了让大家更流畅地使用Rancher，我们将一些资源mirror到了国内，提供给国内用户使用。接下来，我们将详细介绍如何使用这些资源。

使用国内资源下载Rancher组件

我们已经将Rancher的常用组件放在国内服务器上，访问此链接，即可下载所需的组件，从此告别failed: Operation timed out

技术图片

使用阿里云镜像仓库搭建Rancher

我们已经在阿里云镜像仓库中同步了一份原版的镜像，仓库地址: registry.cn-hangzhou.aliyuncs.com

注意：阿里云镜像仓库中的rancher镜像不支持使用 latest、stable等tags，必须指定版本号，例如v2.4.2

接下来，我们来demo如何操作：

1、使用阿里云镜像仓库的Rancher镜像启动Rancher

docker run -itd -p 80:80 -p 443:443     --restart=unless-stopped     -e CATTLE_AGENT_IMAGE="registry.cn-hangzhou.aliyuncs.com/rancher/rancher-agent:v2.4.2"     registry.cn-hangzhou.aliyuncs.com/rancher/rancher:v2.4.2

CATTLE_AGENT_IMAGE: 指定rancher-agent的镜像名称

2、设置默认镜像仓库

从UI导航到Settings，然后编辑system-default-registry，Value设置为registry.cn-hangzhou.aliyuncs.com

技术图片

system-default-registry的参数设置请参考官方文档。

接下来，我们按照官方文档添加自定义集群，只需要等待集群启动成功即可。下图中列出了system-project中所有的workload，这些workload均使用了阿里云的镜像仓库registry.cn-hangzhou.aliyuncs.com内的镜像：

技术图片

仅需3-5分钟就能完成整个集群的搭建，将大幅节省时间，提高工作效率。