HAProxy Log Customization

blog20121029-01.cfg

defaults
    log-format "<format-string>"

blog20121029-02.cfg

log-format "%{+Q}r"
# Outputs: "GET / HTTP/1.1"

log-format "%{+X}Ts"
# Outputs: 5C5342A0

log-format "%{+E}HQ"
# Outputs: ?myparam=[some_brackets\]

log-format "%{+E,+Q}HQ"
# Outputs: "?myparam=[some_brackets\]"

blog20121029-03.cfg

log-format "%ci:%cp [%t] %ft %b/%s %Tw/%Tc/%Tt %B %ts %ac/%fc/%bc/%sc/%rc %sq/%bq"

blog20121029-04.cfg

log-format "%ci:%cp [%tr] %ft %b/%s %TR/%Tw/%Tc/%Tr/%Ta %ST %B %CC %CS %tsc %ac/%fc/%bc/%sc/%rc %sq/%bq %hr %hs %{+Q}r"

blog20121029-05.cfg

log-format "%{+Q}o %{-Q}ci - - [%trg] %r %ST %B \"\" \"\" %cp %ms %ft %b %s %TR %Tw %Tc %Tr %Ta %tsc %ac %fc %bc %sc %rc %sq %bq %CC %CS %hrl %hsl"

blog20121029-06.cfg

log-format "%ci:%cp %si:%sp %HU %ST"
# Outputs: 192.168.50.1:56428 127.0.0.1:80 / 304

blog20121029-07.cfg

log-format "%{+Q}o\ client_address = %ci, client_port = %cp, server_address = %si, server_port = %sp path, = %HU, status = %ST"
# Outputs: client_address = "192.168.50.1", client_port = 56479, server_address = "127.0.0.1", server_port = 8080, path = "/", status = 304

blog20121029-08.cfg

http-request capture req.hdr(Host) len 10
http-request capture req.hdr(Cookie) len 20

log-format "%[capture.req.hdr(0)] %{+Q}[capture.req.hdr(1)]"
# Outputs: example.com "MyCookie=abc123"

blog20121029-09.cfg

http-request set-var(txn.MyVar) str("My Value")
log-format "%{+Q}[var(txn.MyVar)]"
# Outputs: "My Value"

blog20121029-10.cfg

log-format "%ci:%cp [%tr] %ft %b/%s %TR/%Tw/%Tc/%Tr/%Ta %ST %B %CC %CS %tsc %ac/%fc/%bc/%sc/%rc %sq/%bq %hr %hs %{+Q}r %[http_first_req]"
# Outputs: 192.168.50.1:53547 [16/Oct/2019:13:52:09.226] fe_main be_servers/s1 0/0/1/2/3 200 465 - - ---- 2/1/0/0/0 0/0 "GET / HTTP/1.1" 1