[系统运维] 在k8s集群中以svc的方式访问oss

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[系统运维]在k8s集群中以svc的方式访问oss

在k8s集群中以svc的方式访问oss

背景需求

有一个想法，就是既然k8s集群可以实现svc的方式访问外部服务（不管是ip：port或者域名二点方式），那可不可以实现一些特殊场景的需要呢，比如访问阿里云的oss服务。

参考链接:https://www.bbsmax.com/A/KE5QK60jzL/

前置条件

1、开通阿里云oss服务，获取到oss的ak、sk。
2、已部署好的k8s集群。

原理及说明

原理：

利用Nginx lua 实现将阿里云OSS存储空间做到同本地磁盘一样使用。核心是利用Nginx lua
对OSS请求进行签名并利用内部跳转将所有访问本地Nginx的请求加上OSS 签名转发给OSS，实现本地Nginx无缝衔接阿里云OSS。

说明：

1、将nginx.conf进行base64编码，以secret的方式进行部署，然后在deployment中进行将其挂载到nginx服务中的/etc/nginx/conf.d目录下，oss_auth.lua位于nginx服务的/opt目录下。
2、将oss_auth.lua以configmap的方式进行部署，然后在deployment中进行将其挂载，将其挂载到nginx服务中的/opt目录下。
3、nginx.conf文件配置了oss的ak，sk，bucketname，oss的url地址以及内部跳转的配置。

部署文件结构

-> /Users/wangkaixuan/k8s_deploy_oss ~#: tree
.
├── 0.oss_auth.lua
├── 1.nginx.conf
├── 2.nginx-conf-secrets.yaml
├── 3.nginx-lua-file-configmap.yaml
├── 4.oss-deployment.yaml
├── 5.oss-service.yaml
└── README.md

文件说明：

0.oss_auth.lua：为一个lua语言的文件，主要实现对oss的访问鉴权认证；
1.nginx.conf：为nginx的主配置文件，可以实现跳转到oss服务中；
2.nginx-conf-secrets.yaml：为nginx.conf在k8s集群以secret存放的方式；
3.nginx-lua-file-configmap.yaml：为oss_auth.lua文件在k8s集群以comfigmap存放的方式；
4.oss-deployment.yaml：为部署nginx-oss服务的deployment文件；
5.oss-service.yaml：为nginx-oss服务的service文件。

部署操作

step1：编写oss_auth.lua文件，用于nginx中调用该文件

cat 0.oss_auth.lua

-- has been sorted in alphabetical order
local signed_subresources = {
   'acl',
   'append',
   'bucketInfo',
   'cname',
   'commitTransition',
   'comp',
   'cors',
   'delete',
   'lifecycle',
   'location',
   'logging',
   'mime',
   'notification',
   'objectInfo',
   'objectMeta',
   'partData',
   'partInfo',
   'partNumber',
   'policy',
   'position',
   'referer',
   'replication',
   'replicationLocation',
   'replicationProgress',
   'requestPayment',
   'response-cache-control',
   'response-content-disposition',
   'response-content-encoding',
   'response-content-language',
   'response-content-type',
   'response-expires',
   'restore',
   'security-token',
   'tagging',
   'torrent',
   'uploadId',
   'uploads',
   'versionId',
   'versioning',
   'versions',
   'website'
}
function string.startswith(s, start)
   return string.sub(s, 1, string.len(start)) == start
end
local function get_canon_sub_resource()
   local args = ngx.req.get_uri_args()
   -- lower keys
   local keys = {}
   for k, v in pairs(args) do
      keys[k:lower()] = v
   end
   -- make resource string
   local s = ''
   local sep = '?'
   for i, k in ipairs(signed_subresources) do
      v = keys[k]
      if v then
         -- sub table
         v = type(v) == 'table' and v[1] or v
         s = s .. string.format("%s%s=%s", sep, k, v)
         sep = '&'
      end
   end
   return s
end
local function get_canon_resource()
   resource = ''
   object = ngx.unescape_uri(ngx.var.uri)
   sub = get_canon_sub_resource()
   return string.format("/%s%s%s", ngx.var.oss_bucket, object, sub)
end
local function get_canon_headers()
   -- default: <lowerkey, value>
   local headers = ngx.req.get_headers()
   local keys = {}
   for k, v in pairs(headers) do
      if string.startswith(k, 'x-oss-') then
         -- client must assemble the same header keys
         if type(v) ~= 'string' then return nil end
         table.insert(keys, k)
      end
   end
   -- sorted in alphabetical order
   table.sort(keys)
   for i, key in ipairs(keys) do
      keys[i] = key .. ':' .. headers[key] .. '\n'
   end
   return table.concat(keys)
end
local function calc_sign(key, method, md5, type_, date, oss_headers, resource)
    -- string_to_sign:
    -- method + '\n' + content_md5 + '\n' + content_type + '\n'
    -- + date + '\n' + canonicalized_oss_headers + canonicalized_resource
    local sign_str = string.format('%s\n%s\n%s\n%s\n%s%s',
    method, md5, type_,
    date, oss_headers, resource)
    ngx.log(ngx.ERR, "SignStr:", sign_str, "\n")
    local sign_result = ngx.encode_base64(ngx.hmac_sha1(key, sign_str))
    return sign_result, sign_str
end
local function oss_auth()
   -- ngx.log(ngx.INFO, 'auth')
   --local method = ngx.var.request_method
   local method = ngx.req.get_method()
   local content_md5 = ngx.var.http_content_md5 or ''
   local content_type = ngx.var.http_content_type or ''
   -- get date
   local date = ngx.var.http_x_oss_date or ngx.var.http_date or ''
   if date == '' then
      date = ngx.http_time(ngx.time())
      -- ngx.log(ngx.INFO, 'Date:', date)
      ngx.req.set_header('Date', date)
   end
   local resource = get_canon_resource()
   local canon_headers = get_canon_headers()
   local sign_result, sign_str = calc_sign(ngx.var.oss_auth_key, method, content_md5,
   content_type, date, canon_headers, resource)
   -- ngx.log(ngx.INFO, 'sign string:', sign_str)
   -- ngx.log(ngx.INFO, 'sign string len:', string.len(sign_str))
   local auth = string.format("OSS %s:%s", ngx.var.oss_auth_id, sign_result)
   ngx.req.set_header('Authorization', auth)
   ngx.exec("@oss")
end
-- main
res = oss_auth()
if res then
   ngx.exit(res)
end

step2：编写nginx的主配置文件

cat 1.nginx.conf

server {
    listen 80;
    location / {
        set $oss_bucket "bucketname";  #oss的桶名
        set $oss_auth_id "xxxxxxxxxxx";  #oss的access_key
        set $oss_auth_key "xxxxxxxxxxxxxxxxxx"; #oss的secret_key
        rewrite_by_lua_file /opt/oss_auth.lua;  #oss_auth.lua的文件路径
    }
    location @oss {
        proxy_pass http://my.oss-ap-hangzhou.aliyuncs.com; #真实的oss访问地址
    }
}

step3：编写nginx主配置文件的secret文件，需要将nginx.conf以secert的方式挂载到容器中

cat 2.nginx-conf-secrets.yaml

apiVersion: v1
data:
  #nginx.conf通过base64编码生成的字符串
  oss-proxy-lua.conf: c2VydmVyIHsKICAgIGxpc3RdsvsdiA4MDsdvsdKICAgIGxvY2F0aW9uIC8gewogICAgICAgIHNldCAkb3NzX2J1Y2tldCAiZGlwYml0LWRlcGxveS1kZXYiOwogICAgICAgIHNldCAkb3NzX2F1dGhfaWQgIkxUQUlmN1NON0VPaVRzcHciOwogICAgICAgIHNldCAkb3NzX2F1dGhfa2V5ICI1ZUFDZ0wyQlVwb1p3SzBkRUQ3NkRNZkxyMHJFaUgiOwogICAgICAgIHJld3JpdGVfYnlfbHVhX2ZpbGUgL29wdC9vc3NfYXV0aC5sdWE7CiAgICB9CiAgICBsb2NhdGlvbiBAb3NzIHsKICAgICAgICBwcm94eV9wYXNzIGh0dHA6Ly9kaXBiaXQtZGVwbG95LWRldi5vc3MtYXAtc291dGhlYXN0LTEuYWxpeXVuY3MuY29tOwogICAgfQp9Cg==
kind: Secret
metadata:
  name: nginx-conf-secret
  namespace: default
type: Opaque  #Opaque是base64 编码格式的 Secret，用来存储密码、密钥等

step4：编写oss_auth.lua的comfigmap文件，需要将oss_auth.lua以comfigmap的方式挂载到容器中

cat 3.nginx-lua-file-configmap.yaml

apiVersion: v1
data:
  oss_auth.lua: |-
    -- has been sorted in alphabetical order
    local signed_subresources = {
       'acl',
       'append',
       'bucketInfo',
       'cname',
       'commitTransition',
       'comp',
       'cors',
       'delete',
       'lifecycle',
       'location',
       'logging',
       'mime',
       'notification',
       'objectInfo',
       'objectMeta',
       'partData',
       'partInfo',
       'partNumber',
       'policy',
       'position',
       'referer',
       'replication',
       'replicationLocation',
       'replicationProgress',
       'requestPayment',
       'response-cache-control',
       'response-content-disposition',
       'response-content-encoding',
       'response-content-language',
       'response-content-type',
       'response-expires',
       'restore',
       'security-token',
       'tagging',
       'torrent',
       'uploadId',
       'uploads',
       'versionId',
       'versioning',
       'versions',
       'website'
    }
    function string.startswith(s, start)
       return string.sub(s, 1, string.len(start)) == start
    end
    local function get_canon_sub_resource()
       local args = ngx.req.get_uri_args()
       -- lower keys
       local keys = {}
       for k, v in pairs(args) do
          keys[k:lower()] = v
       end
       -- make resource string
       local s = ''
       local sep = '?'
       for i, k in ipairs(signed_subresources) do
          v = keys[k]
          if v then
             -- sub table
             v = type(v) == 'table' and v[1] or v
             s = s .. string.format("%s%s=%s", sep, k, v)
             sep = '&'
          end
       end
       return s
    end
    local function get_canon_resource()
       resource = ''
       object = ngx.unescape_uri(ngx.var.uri)
       sub = get_canon_sub_resource()
       return string.format("/%s%s%s", ngx.var.oss_bucket, object, sub)
    end
    local function get_canon_headers()
       -- default: <lowerkey, value>
       local headers = ngx.req.get_headers()
       local keys = {}
       for k, v in pairs(headers) do
          if string.startswith(k, 'x-oss-') then
             -- client must assemble the same header keys
             if type(v) ~= 'string' then return nil end
             table.insert(keys, k)
          end
       end
       -- sorted in alphabetical order
       table.sort(keys)
       for i, key in ipairs(keys) do
          keys[i] = key .. ':' .. headers[key] .. '\n'
       end
       return table.concat(keys)
    end
    local function calc_sign(key, method, md5, type_, date, oss_headers, resource)
        -- string_to_sign:
        -- method + '\n' + content_md5 + '\n' + content_type + '\n'
        -- + date + '\n' + canonicalized_oss_headers + canonicalized_resource
        local sign_str = string.format('%s\n%s\n%s\n%s\n%s%s',
        method, md5, type_,
        date, oss_headers, resource)
        ngx.log(ngx.ERR, "SignStr:", sign_str, "\n")
        local sign_result = ngx.encode_base64(ngx.hmac_sha1(key, sign_str))
        return sign_result, sign_str
    end
    local function oss_auth()
       -- ngx.log(ngx.INFO, 'auth')
       --local method = ngx.var.request_method
       local method = ngx.req.get_method()
       local content_md5 = ngx.var.http_content_md5 or ''
       local content_type = ngx.var.http_content_type or ''
       -- get date
       local date = ngx.var.http_x_oss_date or ngx.var.http_date or ''
       if date == '' then
          date = ngx.http_time(ngx.time())
          -- ngx.log(ngx.INFO, 'Date:', date)
          ngx.req.set_header('Date', date)
       end
       local resource = get_canon_resource()
       local canon_headers = get_canon_headers()
       local sign_result, sign_str = calc_sign(ngx.var.oss_auth_key, method, content_md5,
       content_type, date, canon_headers, resource)
       -- ngx.log(ngx.INFO, 'sign string:', sign_str)
       -- ngx.log(ngx.INFO, 'sign string len:', string.len(sign_str))
       local auth = string.format("OSS %s:%s", ngx.var.oss_auth_id, sign_result)
       ngx.req.set_header('Authorization', auth)
       ngx.exec("@oss")
    end
    -- main
    res = oss_auth()
    if res then
       ngx.exit(res)
    end
kind: ConfigMap
metadata:
  name: nginx-lua-configmap
  namespace: default

step5：编写部署服务的文件

cat 4.oss-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "7"
  labels:
    app: aliyun-oss
  name: aliyun-oss
  namespace: default
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: aliyun-oss
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: aliyun-oss
    spec:
      containers:
      - env:
        - name: LUA_PATH
          value: /opt;;
        image: registry.ap-southeast-1.aliyuncs.com/mynamespace:openresty-1.13.6.2-0-centos-rpm
        imagePullPolicy: IfNotPresent
        name: aliyun-oss
        ports:
        - containerPort: 80
          name: aliyun-oss
          protocol: TCP
        resources:
          requests:
            cpu: 250m
            memory: 256Mi
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /opt
          name: nginx-lua-file  #oss_auth.lua文件的挂载路径
        - mountPath: /etc/nginx/conf.d
          name: nginx-conf-file      #nginx.conf的挂载路径
        - mountPath: /etc/localtime
          name: container-localtime  #容器的市区
      dnsPolicy: ClusterFirst
      imagePullSecrets:
      - name: 41c11f57a260c99d30449e6d31b77e77  #拉取的密钥
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
      volumes:
      - configMap:        #以confimap的方式挂载到容器中
          defaultMode: 420
          name: nginx-lua-configmap  #oss_auth.lua存放在nginx-lua-configmap中
        name: nginx-lua-file
      - secret:          #以secret的方式挂载到容器中
          defaultMode: 420
          secretName: nginx-conf-secret   #nginx.conf存放在nginx-conf-secret中
        name: nginx-conf-file
      - hostPath:        #以hostpath的方式挂载到容器中
          path: /etc/localtime
          type: ""
        name: container-localtime

step6：编写部署服务的svc文件

cat 5.oss-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: oss-svc
  namespace: default
spec:
  clusterIP: None
  ports:
    - name: oss-proxy
      port: 80
      protocol: TCP
      targetPort: 80
  selector:
    app: aliyun-oss

step7：执行部署命令

kubectl apply -f 2.nginx-conf-secrets.yaml
kubectl apply -f 3.nginx-lua-file-configmap.yam 
kubectl apply -f 4.oss-deployment.yaml
kubectl apply -f 5.oss-service.yaml