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####signature v4回退至v2 使用s3cmd 1.6.1版本连接rgw（ceph 0.94.5）发现如下问题
DEBUG: CreateRequest: resource[uri]=/
DEBUG: Using signature v4
DEBUG: get_hostname(s3soft): s3soft.s3.xxx.com
DEBUG: canonical_headers = host:s3soft.s3.xxx.com
x-amz-content-sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
x-amz-date:20160429T123546Z
DEBUG: Canonical Request:
GET
/
delimiter=%2F
host:s3soft.s3.xxx.com
x-amz-content-sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
x-amz-date:20160429T123546Z
host;x-amz-content-sha256;x-amz-date
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
DEBUG: signature-v4 headers: {'x-amz-content-sha256': 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855', 'Authorization': 'AWS4-HMAC-SHA256 Credential=KFIH2I8PDAU38KABCDEFG/20160429/US/s3/aws4_request,SignedHeaders=host;x-amz-content-sha256;x-amz-date,Signature=e94cbf3893183ccf53b6f4b38a2136252c83c6fd022f9cab1f4ccbc29f78cd30', 'x-amz-date': '20160429T123546Z'}
DEBUG: Processing request, please wait...
DEBUG: get_hostname(s3soft): s3soft.s3.xxx.com
DEBUG: ConnMan.get(): creating new connection: http://s3soft.s3.xxx.com
DEBUG: non-proxied HTTPConnection(s3soft.s3.xxx.com)
DEBUG: format_uri(): /?delimiter=/
DEBUG: Sending request method_string='GET', uri='/?delimiter=/', headers={'x-amz-content-sha256': 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855', 'Authorization': 'AWS4-HMAC-SHA256 Credential=KFIH2I8PDAU38KABCDEFG/20160429/US/s3/aws4_request,SignedHeaders=host;x-amz-content-sha256;x-amz-date,Signature=e94cbf3893183ccf53b6f4b38a2136252c83c6fd022f9cab1f4ccbc29f78cd30', 'x-amz-date': '20160429T123546Z'}, body=(0 bytes)
DEBUG: Response: {'status': 400, 'headers': {'content-length': '81', 'accept-ranges': 'bytes', 'server': 'openresty', 'connection': 'keep-alive', 'x-amz-request-id': 'tx00000000000000017a1e9-0057235523-d753-hxs1', 'date': 'Fri, 29 Apr 2016 12:35:47 GMT', 'content-type': 'application/xml'}, 'reason': 'Bad Request', 'data': 'InvalidArgument'}
DEBUG: ConnMan.put(): connection put back to pool (http://s3soft.s3.xxx.com#1)
DEBUG: Falling back to signature v2
DEBUG: Using signature v2
DEBUG: SignHeaders: 'GET\n\n\n\nx-amz-content-sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\nx-amz-date:Fri, 29 Apr 2016 12:35:47 +0000\n/s3soft/'
DEBUG: Processing request, please wait...
DEBUG: get_hostname(s3soft): s3soft.s3.xxx.com
DEBUG: ConnMan.get(): re-using connection: http://s3soft.s3.xxx.com#1
DEBUG: format_uri(): /?delimiter=/
DEBUG: Sending request method_string='GET', uri='/?delimiter=/', headers={'x-amz-content-sha256': 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855', 'Authorization': 'AWS KFIH2I8PDAU38KABCDEFG:jhRC5YXvJL5suBcVb4dE2rsGDfg=', 'x-amz-date': 'Fri, 29 Apr 2016 12:35:47 +0000'}, body=(0 bytes)
DEBUG: Response: {'status': 200, 'headers': {'transfer-encoding': 'chunked', 'server': 'openresty', 'connection': 'keep-alive', 'x-amz-request-id': 'tx00000000000000017a858-0057235523-d750-hxs1', 'date': 'Fri, 29 Apr 2016 12:35:47 GMT', 'content-type': 'application/xml'}, 'reason': 'OK', 'data':
###原因分析 目前只有10.2.0版本才支持v4版本的signature，因此需要关闭signature v4的认证，默认使用signature v2。减少客户端非法请求次数，也是优化手段之一。
###解决方法 vi ~/.s3cfg 设置如下即可
signature_v2 = True
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