Balancer access logs

The Balancer access log provides information about requests received at the balancer level. Since most customers use shared load balancers, Varnish logs are only available using the log stream feature and cannot be downloaded from either the Acquia Cloud interface or your servers.

For a list of the log files handled by Acquia Cloud, including accessing these log files, log file retention, and their locations, see About Acquia Cloud logging. You can also review information about how to streaming Varnish log entries in real time from your browser.

Note for log streaming users

Acquia’s log streaming feature displays the name of the server responding to a request at the beginning of each line — however, this information does not appear in the log file itself.

Parsing the log file

The following line is a representative example of the data written into your website’s balancer access log: - - [30/Dec/2016:18:12:20 +0000] "GET /names HTTP/1.1" 200 12750 "-"
"facebookexternalhit/1.1" affinity="-"  upstream_addr="" hosting_site=alphabeta request_time=1.263 forwarded_for="," upstream_status="200"
request_id="v-0000zzzz-cebb-0000-9948-0efda0c0zzzz" ssl_protocol="TLSv1.2" ssl_cipher="AES128-GCM-SHA256"

Each of the items in the balancer access log is noted in the following table, along with its description:

Position Data Description
0 The IP address of the web client accessing the balancer
1 - The name of a remote log file, if used (- is an empty value)
2 - The username the web client was authorized under, if used (- is an empty value)
3 [30/Dec/2016:18:12:20 +0000] The date and time of the request
4 GET The method of the request — frequently GET or POST
5 /names The document requested, relative to the docroot of the website
6 HTTP/1.1 TheHTTP protocol used for the request
7 200 The HTTP status code returned by the balancer — note that it may differ from the HTTP status code returned by the backend server the request was forwarded to
8 12750 Size, in bytes, of the server’s response
9 "-" The referrer URL, if any (- is an empty value)
10 facebookexternalhit/1.1 The user-agent of the request
11 The requested domain name
12 affinity="-" The backend server this request was pinned to, if any (- is an empty value)
13 upstream_addr="" The backend server the balancer forwarded this request to
14 hosting_site=alphabeta The internal Acquia site name this request is for
15 request_time=1.263 Time in seconds needed to complete this request
16 forwarded_for=","

The full set of IP addresses tracked as “requester IP,” which will contain the IP addresses of the following if they are in use by the subscription:

  • Load balancer
  • ELB (Elastic Load Balancer)
  • Content Delivery Networks or Web Application Firewalls (WAFs) such as Acquia Cloud Edge)
17 upstream_status="200" The HTTP status code returned by the backend server the request was forwarded to — note that it may differ from the HTTP status code returned by the balancer
18 request_id="v-0000zzzz-cebb-0000-9948-0efda0c0zzzz" A unique ID attached to this request by the load balancer, which appears in several Acquia Cloud log files — for more information, see Using HTTP request IDs
19 ssl_protocol="TLSv1.2" The SSL protocol used for this request, if any
20 ssl_cipher="AES128-GCM-SHA256" The SSL cipher used for this request, if any

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