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HAProxy TCP log format (1.7)
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8.2.2. TCP log format | |
--------------------- | |
The TCP format is used when "option tcplog" is specified in the frontend, and | |
is the recommended format for pure TCP proxies. It provides a lot of precious | |
information for troubleshooting. Since this format includes timers and byte | |
counts, the log is normally emitted at the end of the session. It can be | |
emitted earlier if "option logasap" is specified, which makes sense in most | |
environments with long sessions such as remote terminals. Sessions which match | |
the "monitor" rules are never logged. It is also possible not to emit logs for | |
sessions for which no data were exchanged between the client and the server, by | |
specifying "option dontlognull" in the frontend. Successful connections will | |
not be logged if "option dontlog-normal" is specified in the frontend. A few | |
fields may slightly vary depending on some configuration options, those are | |
marked with a star ('*') after the field name below. | |
Example : | |
frontend fnt | |
mode tcp | |
option tcplog | |
log global | |
default_backend bck | |
backend bck | |
server srv1 127.0.0.1:8000 | |
>>> Feb 6 12:12:56 localhost \ | |
haproxy[14387]: 10.0.1.2:33313 [06/Feb/2009:12:12:51.443] fnt \ | |
bck/srv1 0/0/5007 212 -- 0/0/0/0/3 0/0 | |
Field Format Extract from the example above | |
1 process_name '[' pid ']:' haproxy[14387]: | |
2 client_ip ':' client_port 10.0.1.2:33313 | |
3 '[' accept_date ']' [06/Feb/2009:12:12:51.443] | |
4 frontend_name fnt | |
5 backend_name '/' server_name bck/srv1 | |
6 Tw '/' Tc '/' Tt* 0/0/5007 | |
7 bytes_read* 212 | |
8 termination_state -- | |
9 actconn '/' feconn '/' beconn '/' srv_conn '/' retries* 0/0/0/0/3 | |
10 srv_queue '/' backend_queue 0/0 | |
Detailed fields description : | |
- "client_ip" is the IP address of the client which initiated the TCP | |
connection to haproxy. If the connection was accepted on a UNIX socket | |
instead, the IP address would be replaced with the word "unix". Note that | |
when the connection is accepted on a socket configured with "accept-proxy" | |
and the PROXY protocol is correctly used, or with a "accept-netscaler-cip" | |
and the NetScaler Client IP insetion protocol is correctly used, then the | |
logs will reflect the forwarded connection's information. | |
- "client_port" is the TCP port of the client which initiated the connection. | |
If the connection was accepted on a UNIX socket instead, the port would be | |
replaced with the ID of the accepting socket, which is also reported in the | |
stats interface. | |
- "accept_date" is the exact date when the connection was received by haproxy | |
(which might be very slightly different from the date observed on the | |
network if there was some queuing in the system's backlog). This is usually | |
the same date which may appear in any upstream firewall's log. | |
- "frontend_name" is the name of the frontend (or listener) which received | |
and processed the connection. | |
- "backend_name" is the name of the backend (or listener) which was selected | |
to manage the connection to the server. This will be the same as the | |
frontend if no switching rule has been applied, which is common for TCP | |
applications. | |
- "server_name" is the name of the last server to which the connection was | |
sent, which might differ from the first one if there were connection errors | |
and a redispatch occurred. Note that this server belongs to the backend | |
which processed the request. If the connection was aborted before reaching | |
a server, "<NOSRV>" is indicated instead of a server name. | |
- "Tw" is the total time in milliseconds spent waiting in the various queues. | |
It can be "-1" if the connection was aborted before reaching the queue. | |
See "Timers" below for more details. | |
- "Tc" is the total time in milliseconds spent waiting for the connection to | |
establish to the final server, including retries. It can be "-1" if the | |
connection was aborted before a connection could be established. See | |
"Timers" below for more details. | |
- "Tt" is the total time in milliseconds elapsed between the accept and the | |
last close. It covers all possible processing. There is one exception, if | |
"option logasap" was specified, then the time counting stops at the moment | |
the log is emitted. In this case, a '+' sign is prepended before the value, | |
indicating that the final one will be larger. See "Timers" below for more | |
details. | |
- "bytes_read" is the total number of bytes transmitted from the server to | |
the client when the log is emitted. If "option logasap" is specified, the | |
this value will be prefixed with a '+' sign indicating that the final one | |
may be larger. Please note that this value is a 64-bit counter, so log | |
analysis tools must be able to handle it without overflowing. | |
- "termination_state" is the condition the session was in when the session | |
ended. This indicates the session state, which side caused the end of | |
session to happen, and for what reason (timeout, error, ...). The normal | |
flags should be "--", indicating the session was closed by either end with | |
no data remaining in buffers. See below "Session state at disconnection" | |
for more details. | |
- "actconn" is the total number of concurrent connections on the process when | |
the session was logged. It is useful to detect when some per-process system | |
limits have been reached. For instance, if actconn is close to 512 when | |
multiple connection errors occur, chances are high that the system limits | |
the process to use a maximum of 1024 file descriptors and that all of them | |
are used. See section 3 "Global parameters" to find how to tune the system. | |
- "feconn" is the total number of concurrent connections on the frontend when | |
the session was logged. It is useful to estimate the amount of resource | |
required to sustain high loads, and to detect when the frontend's "maxconn" | |
has been reached. Most often when this value increases by huge jumps, it is | |
because there is congestion on the backend servers, but sometimes it can be | |
caused by a denial of service attack. | |
- "beconn" is the total number of concurrent connections handled by the | |
backend when the session was logged. It includes the total number of | |
concurrent connections active on servers as well as the number of | |
connections pending in queues. It is useful to estimate the amount of | |
additional servers needed to support high loads for a given application. | |
Most often when this value increases by huge jumps, it is because there is | |
congestion on the backend servers, but sometimes it can be caused by a | |
denial of service attack. | |
- "srv_conn" is the total number of concurrent connections still active on | |
the server when the session was logged. It can never exceed the server's | |
configured "maxconn" parameter. If this value is very often close or equal | |
to the server's "maxconn", it means that traffic regulation is involved a | |
lot, meaning that either the server's maxconn value is too low, or that | |
there aren't enough servers to process the load with an optimal response | |
time. When only one of the server's "srv_conn" is high, it usually means | |
that this server has some trouble causing the connections to take longer to | |
be processed than on other servers. | |
- "retries" is the number of connection retries experienced by this session | |
when trying to connect to the server. It must normally be zero, unless a | |
server is being stopped at the same moment the connection was attempted. | |
Frequent retries generally indicate either a network problem between | |
haproxy and the server, or a misconfigured system backlog on the server | |
preventing new connections from being queued. This field may optionally be | |
prefixed with a '+' sign, indicating that the session has experienced a | |
redispatch after the maximal retry count has been reached on the initial | |
server. In this case, the server name appearing in the log is the one the | |
connection was redispatched to, and not the first one, though both may | |
sometimes be the same in case of hashing for instance. So as a general rule | |
of thumb, when a '+' is present in front of the retry count, this count | |
should not be attributed to the logged server. | |
- "srv_queue" is the total number of requests which were processed before | |
this one in the server queue. It is zero when the request has not gone | |
through the server queue. It makes it possible to estimate the approximate | |
server's response time by dividing the time spent in queue by the number of | |
requests in the queue. It is worth noting that if a session experiences a | |
redispatch and passes through two server queues, their positions will be | |
cumulated. A request should not pass through both the server queue and the | |
backend queue unless a redispatch occurs. | |
- "backend_queue" is the total number of requests which were processed before | |
this one in the backend's global queue. It is zero when the request has not | |
gone through the global queue. It makes it possible to estimate the average | |
queue length, which easily translates into a number of missing servers when | |
divided by a server's "maxconn" parameter. It is worth noting that if a | |
session experiences a redispatch, it may pass twice in the backend's queue, | |
and then both positions will be cumulated. A request should not pass | |
through both the server queue and the backend queue unless a redispatch | |
occurs. |
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