This patch allows to collect & provide separate statistics for each socket.
It can be very useful if you would like to distinguish between traffic
generate by local and remote users or between different types of remote
clients (peerings, domestic, foreign).
Currently no "Session rate" is supported, but adding it should be possible
if we found it useful.
By default, when data is sent over a socket, both the write timeout and the
read timeout for that socket are refreshed, because we consider that there is
activity on that socket, and we have no other means of guessing if we should
receive data or not.
While this default behaviour is desirable for almost all applications, there
exists a situation where it is desirable to disable it, and only refresh the
read timeout if there are incoming data. This happens on sessions with large
timeouts and low amounts of exchanged data such as telnet session. If the
server suddenly disappears, the output data accumulates in the system's
socket buffers, both timeouts are correctly refreshed, and there is no way
to know the server does not receive them, so we don't timeout. However, when
the underlying protocol always echoes sent data, it would be enough by itself
to detect the issue using the read timeout. Note that this problem does not
happen with more verbose protocols because data won't accumulate long in the
socket buffers.
When this option is set on the frontend, it will disable read timeout updates
on data sent to the client. There probably is little use of this case. When
the option is set on the backend, it will disable read timeout updates on
data sent to the server. Doing so will typically break large HTTP posts from
slow lines, so use it with caution.
The "static-rr" is just the old round-robin algorithm. It is still
in use when a hash algorithm is used and the data to hash is not
present, but it was impossible to configure it explicitly. This one
is cheaper in terms of CPU and supports unlimited numbers of servers,
so it makes sense to be able to use it.
This patch implements "description" (proxy and global) and "node" (global)
options, removes "node-name" and adds "show-node" & "show-desc" options
for "stats". It also changes the way the header lines (with proxy name) and
the statistics are displayed, so stats no longer look so clumsy with very
long names.
Instead of "node-name" it is possible to use show-node/show-desc with
an optional parameter that overrides a default node/description.
backend cust-0045
# report specific values for this customer
stats show-node Europe
stats show-desc Master node for Europe, Asia, Africa
This patch adds health logging so it possible to check what
was happening before a crash. Failed healt checks are logged if
server is UP and succeeded healt checks if server is DOWN,
so the amount of additional information is limited.
I also reworked the code a little:
- check_status_description[] and check_status_info[] is now
joined into check_statuses[]
- set_server_check_status updates not only s->check_status and
s->check_duration but also s->result making the code simpler
Changes in v3:
- for now calculate and use local versions of health/rise/fall/state,
it is a slow path, no harm should be done. One day we may centralize
processing of the checks and remove the duplicated code.
- also log checks that are restoring current state
- use "conditionally succeeded" for 404 with disable-on-404
We can get rid of the stats analyser by moving all the stats code
to a stream interface applet. Above being cleaner, it provides new
advantages such as the ability to process requests and responses
from the same function and work only with simple state machines.
There's no need for any hijack hack anymore.
The direct advantage for the user are the interactive mode and the
ability to chain several commands delimited by a semi-colon. Now if
the user types "prompt", he gets a prompt from which he can send
as many requests as he wants. All outputs are terminated by a
blank line followed by a new prompt, so this can be used from
external tools too.
The code is not very clean, it needs some rework, but some part
of the dirty parts are due to the remnants of the hijack mode used
in the old functions we call.
The old AN_REQ_STATS_SOCK analyser flag is now unused and has been
removed.
Collect information about last health check result,
including L7 code if possible (for example http or smtp
return code) and time took to finish last check.
Health check info is provided on both stats pages (html & csv)
and logged when a server is marked UP or DOWN. Currently active
check are marked with an asterisk, but only in html mode.
Currently there are 14 status codes:
UNK -> unknown
INI -> initializing
SOCKERR -> socket error
L4OK -> check passed on layer 4, no upper layers testing enabled
L4TOUT -> layer 1-4 timeout
L4CON -> layer 1-4 connection problem, for example "Connection refused"
(tcp rst) or "No route to host" (icmp)
L6OK -> check passed on layer 6
L6TOUT -> layer 6 (SSL) timeout
L6RSP -> layer 6 invalid response - protocol error
L7OK -> check passed on layer 7
L7OKC -> check conditionally passed on layer 7, for example
404 with disable-on-404
L7TOUT -> layer 7 (HTTP/SMTP) timeout
L7RSP -> layer 7 invalid response - protocol error
L7STS -> layer 7 response error, for example HTTP 5xx
An abort during a connect would go to the SI_ST_CLO state without
the buffers shut. This was causing some sessions to never end if
they would abort before the connect request was initiated. This
bug has been introduced after 1.4-dev2.
The doc has been extended to reflect that too.
HTTP supports status codes 100 and 101 to report protocol indications,
which are followed by the requests's response. Till now, haproxy would
only see those responses without parsing subsequent ones. That means
that cookie additions were only performed on 1xx messages for instance,
which does not work since headers must be ignored with 1xx messages.
Also, logs were not terribly useful with the common 100 status code
in response to "Expect: 100-continue" during POST some requests.
This change adds support for such messages. Now haproxy sees them,
forwards them and skips them until it finds a correct response, which
it logs and processes. As an exception, header removal/rewriting still
work on 1xx responses in order to be able to strip out sensible
information that may have accidentely been left by another equipment
(possibly an older haproxy itself). But headers addition are disabled
however.
This change brings the ability to loop on response without data, which
is a starting point to support keepalive. The change is marked as major
as a few fixes had to be performed in the HTTP message parser.
The new tune.bufsize and tune.maxrewrite global directives allow one to
change the buffer size and the maxrewrite size. Right now, setting bufsize
too low will block stats sockets which will not be able to write at all.
An error checking must be added to buffer_write_chunk() so that if it
cannot write its message to an empty buffer, it causes the caller to abort.
This Linux-specific option was never really used in production and
has since been superseded by new splicing options brought by recent
Linux kernels.
It caused several particular cases in the code because the kernel
would take care of the session without haproxy being able to do
anything on it, which became hard to handle in the new architecture.
Let's simply get rid of it now that there is a replacement available.
The new "node-name" stats setting enables reporting of a node ID on
the stats page. It is possible to return the system's host name as
well as a specific name.
Released version 1.4-dev1 with the following main changes :
- [MINOR] acl: add support for matching of RDP cookies
- [MEDIUM] add support for RDP cookie load-balancing
- [MEDIUM] add support for RDP cookie persistence
- [MINOR] add a new CLF log format
- [MINOR] startup: don't imply -q with -D
- [BUG] ensure that we correctly re-start old process in case of error
- [MEDIUM] add support for binding to source port ranges during connect
- [MINOR] config: track "no option"/"option" changes
- [MINOR] config: support resetting options do default values
- [MEDIUM] implement option tcp-smart-accept at the frontend
- [MEDIUM] stream_sock: implement tcp-cork for use during shutdowns on Linux
- [MEDIUM] implement tcp-smart-connect option at the backend
- [MEDIUM] add support for TCP MSS adjustment for listeners
- [MEDIUM] support setting a server weight to zero
- [MINOR] make DEFAULT_MAXCONN user-configurable at build time
- [MAJOR] session: don't clear buffer status flags anymore
- [MAJOR] session: only check for timeouts when they have just occurred.
- [MAJOR] session: simplify buffer error handling
- [MEDIUM] config: split parser and checker in two functions
- [MEDIUM] config: support loading multiple configuration files
- [MEDIUM] stream_sock: don't close prematurely when nolinger is set
- [MEDIUM] session: rework buffer analysis to permit permanent analysers
- [MEDIUM] splice: set the capability on each stream_interface
- [BUG] http: redirect rules were processed too early
- [CLEANUP] remove unused DEBUG_PARSE_NO_SPEEDUP define
- [MEDIUM] http: split request waiter from request processor
- [MEDIUM] session: tell analysers what bit they were called for
- [MAJOR] http: complete splitting of the remaining stages
- [MINOR] report in the proxies the requirements for ACLs
- [MINOR] http: rely on proxy->acl_requires to allocate hdr_idx
- [MINOR] acl: add HTTP protocol detection (req_proto_http)
- [MINOR] prepare callers of session_set_backend to handle errors
- [BUG] default ACLs did not properly set the ->requires flag
- [MEDIUM] allow a TCP frontend to switch to an HTTP backend
- [MINOR] ensure we can jump from swiching rules to http without data
- [MINOR] http: take http request timeout from the backend
- [MINOR] allow TCP inspection rules to make use of HTTP ACLs
- [BUILD] report commit date and not author's date as build date
- [MINOR] acl: don't complain anymore when using L7 acls in TCP
- [BUG] stream_sock: always shutdown(SHUT_WR) before closing
- [BUG] stream_sock: don't stop reading when the poller reports an error
- [BUG] config: tcp-request content only accepts "if" or "unless"
- [BUG] task: fix possible timer drift after update
- [MINOR] apply tcp-smart-connect option for the checks too
- [MINOR] stats: better displaying in MSIE
- [MINOR] config: improve error reporting in global section
- [MINOR] config: improve error reporting in listen sections
- [MINOR] config: the "capture" keyword is not allowed in backends
- [MINOR] config: improve error reporting when checking configuration
- [BUILD] fix a minor build warning on AIX
- [BUILD] use "git cmd" instead of "git-cmd"
- [CLEANUP] report 2009 not 2008 in the copyright banner.
- [MINOR] print usage on the stats sockets upon invalid commands
- [MINOR] acl: detect and report potential mistakes in ACLs
- [BUILD] fix incorrect printf arg count with tcp_splice
- [BUG] fix random pauses on last segment of a series
- [BUILD] add support for build under Cygwin
The new statement "persist rdp-cookie" enables RDP cookie
persistence. The RDP cookie is then extracted from the RDP
protocol, and compared against available servers. If a server
matches the RDP cookie, then it gets the connection.
This patch adds support for hashing RDP cookies in order to
use them as a load-balancing key. The new "rdp-cookie(name)"
load-balancing metric has to be used for this. It is still
mandatory to wait for an RDP cookie in the frontend, otherwise
it will randomly work.
The RDP protocol is quite simple and documented, which permits
an easy detection and extraction of cookies. It can be useful
to match the MSTS cookie which can contain the username specified
by the client.
Since we can now switch from TCP to HTTP, we need to be able to apply
the HTTP request timeout after switching. That means we need to take
it from the backend and not from the frontend. Since the backend points
to the frontend before switching, that changes nothing for the normal
case.
This patch allows a TCP frontend to switch to an HTTP backend.
During the switch, missing structures are automatically allocated.
The HTTP parser is enabled so that the backend first waits for a
full HTTP request.
Now that we can perform TCP-based content switching, it makes sense
to be able to detect HTTP traffic and act accordingly. We already
have an HTTP decoder, we just have to call it in order to detect HTTP
protocol. Note that since the decoder will automatically fill in the
interesting fields of the HTTP transaction, it would make sense to
use this parsing to extend HTTP matching to TCP.
The HTTP processing has been splitted into 7 steps, one of which
is not anymore HTTP-specific (content-switching). That way, it
becomes possible to use "use_backend" rules in TCP mode. A new
"use_server" directive should follow soon.
Sometimes it can be useful to limit the advertised TCP MSS on
incoming connections, for instance when requests come through
a VPN or when the system is running with jumbo frames enabled.
Passing the "mss <value>" arguments to a "bind" line will set
the value. This works under Linux >= 2.6.28, and maybe a few
earlier ones, though due to an old kernel bug most of earlier
versions will probably ignore it. It is also possible that some
other OSes will support this.
This new option enables combining of request buffer data with
the initial ACK of an outgoing TCP connection. Doing so saves
one packet per connection which is quite noticeable on workloads
mostly consisting in small objects. The option is not enabled by
default.
This option disables TCP quick ack upon accept. It is also
automatically enabled in HTTP mode, unless the option is
explicitly disabled with "no option tcp-smart-accept".
This saves one packet per connection which can bring reasonable
amounts of bandwidth for servers processing small requests.
A new keyword prefix "default" has been introduced in order to
reset some options to their default values. This can be needed
for instance when an option is forced disabled or enabled in a
defaults section and when later sections want to use automatic
settings regardless of what was specified there. Right now it
is only supported by options, just like the "no" prefix.
Some users are already hitting the 64k source port limit when
connecting to servers. The system usually maintains a list of
unused source ports, regardless of the source IP they're bound
to. So in order to go beyond the 64k concurrent connections, we
have to manage the source ip:port lists ourselves.
The solution consists in assigning a source port range to each
server and use a free port in that range when connecting to that
server, either for a proxied connection or for a health check.
The port must then be put back into the server's range when the
connection is closed.
This mechanism is used only when a port range is specified on
a server. It makes it possible to reach 64k connections per
server, possibly all from the same IP address. Right now it
should be more than enough even for huge deployments.
Released version 1.3.18 with the following main changes :
- [MEDIUM] add support for "balance hdr(name)"
- [CLEANUP] give a little bit more information in error message
- [MINOR] add X-Original-To: header
- [BUG] x-original-to: fix missing initialization to default value
- [BUILD] spec file: fix broken pipe during rpmbuild and add man file
- [MINOR] improve reporting of misplaced acl/reqxxx rules
- [MEDIUM] http: add options to ignore invalid header names
- [MEDIUM] http: capture invalid requests/responses even if accepted
- [BUILD] add format(printf) to printf-like functions
- [MINOR] fix several printf formats and missing arguments
- [BUG] stats: total and lbtot are unsigned
- [MINOR] fix a few remaining printf-like formats on 64-bit platforms
- [CLEANUP] remove unused make option from haproxy.spec
- [BUILD] make it possible to pass alternative arch at build time
- [MINOR] switch all stat counters to 64-bit
- [MEDIUM] ensure we don't recursively call pool_gc2()
- [CRITICAL] uninitialized response field can sometimes cause crashes
- [BUG] fix wrong pointer arithmetics in HTTP message captures
- [MINOR] rhel init script : support the reload operation
- [MINOR] add basic signal handling functions
- [BUILD] add signal.o to all makefiles
- [MEDIUM] call signal_process_queue from run_poll_loop
- [MEDIUM] pollers: don't wait if a signal is pending
- [MEDIUM] convert all signals to asynchronous signals
- [BUG] O(1) pollers should check their FD before closing it
- [MINOR] don't close stdio fds twice
- [MINOR] add options dontlog-normal and log-separate-errors
- [DOC] minor fixes and rearrangements
- [BUG] fix parser crash on unconditional tcp content rules
- [DOC] rearrange the configuration manual and add a summary
- [MINOR] standard: provide a new 'my_strndup' function
- [MINOR] implement per-logger log level limitation
- [MINOR] compute the max of sessions/s on fe/be/srv
- [MINOR] stats: report max sessions/s and limit in CSV export
- [MINOR] stats: report max sessions/s and limit in HTML stats
- [MINOR] stats/html: use the arial font before helvetica
Some people are using haproxy in a shared environment where the
system logger by default sends alert and emerg messages to all
consoles, which happens when all servers go down on a backend for
instance. These people can not always change the system configuration
and would like to limit the outgoing messages level in order not to
disturb the local users.
The addition of an optional 4th field on the "log" line permits
exactly this. The minimal log level ensures that all outgoing logs
will have at least this level. So the logs are not filtered out,
just set to this level.
There is a patch made by me that allow for balancing on any http header
field.
[WT:
made minor changes:
- turned 'balance header name' into 'balance hdr(name)' to match more
closely the ACL syntax for easier future convergence
- renamed the proxy structure fields header_* => hh_*
- made it possible to use the domain name reduction to any header, not
only "host" since it makes sense to do it with other ones.
Otherwise patch looks good.
/WT]
Several people have asked for a summary in order to ease finding
of sections in the configuration manual. It was the opportunity to
tidy it up a bit and rearrange some sections.
Some big traffic sites have trouble dealing with logs and tend to
disable them. Here are two new options to help cope with massive
logs.
- dontlog-normal only disables logging for 100% successful
connections, other ones will still be logged
- log-separate-errors will cause non-100% successful connections
to be logged at level "err" instead of level "info" so that a
properly configured syslog daemon can send them to a different
file for longer conservation.
I have attached a patch which will add on every http request a new
header 'X-Original-To'. If you have HAProxy running in transparent mode
with a big number of SQUID servers behind it, it is very nice to have
the original destination ip as a common header to make decisions based
on it.
The whole thing is configurable with a new option 'originalto'. I have
updated the sourcecode as well as the documentation. The 'haproxy-en.txt'
and 'haproxy-fr.txt' files are untouched, due to lack of my french
language knowledge. ;)
Also the patch adds this header for IPv4 only. I haven't any IPv6 test
environment running here and don't know if getsockopt() with SO_ORIGINAL_DST
will work on IPv6. If someone knows it and wants to test it I can modify
the diff. Feel free to ask me questions or things which should be changed. :)
--Maik
It's useful to be able to accept an invalid header name in a request
or response but still be able to monitor further such errors. Now,
when an invalid request/response is received and accepted due to
an "accept-invalid-http-{request|response}" option, the invalid
request will be captured for later analysis with "show errors" on
the stats socket.
Released version 1.3.17 with the following main changes :
- Update specfile to build for v2.6 kernel.
- [BUG] reset the stream_interface connect timeout upon connect or error
- [BUG] reject unix accepts when connection limit is reached
- [MINOR] show sess: report number of calls to each task
- [BUG] don't call epoll_ctl() on closed sockets
- [BUG] stream_sock: disable I/O on fds reporting an error
- [MINOR] sepoll: don't count two events on the same FD.
- [MINOR] show sess: report a lot more information about sessions
- [BUG] stream_sock: check for shut{r,w} before refreshing some timeouts
- [BUG] don't set an expiration date directly from now_ms
- [MINOR] implement ulltoh() to write HTML-formatted numbers
- [MINOR] stats/html: group digits by 3 to clarify numbers
- [BUILD] remove haproxy-small.spec
- [BUILD] makefile: remove unused references to linux24eold and EPOLL_CTL_WORKAROUND
Released version 1.3.16 with the following main changes :
- [BUILD] Fixed Makefile for linking pcre
- [CONTRIB] selinux policy for haproxy
- [MINOR] show errors: encode backslash as well as non-ascii characters
- [MINOR] cfgparse: some cleanups in the consistency checks
- [MINOR] cfgparse: set backends to "balance roundrobin" by default
- [MINOR] tcp-inspect: permit the use of no-delay inspection
- [MEDIUM] reverse internal proxy declaration order to match configuration
- [CLEANUP] config: catch and report some possibly wrong rule ordering
- [BUG] connect timeout is in the stream interface, not the buffer
- [BUG] session: errors were not reported in termination flags in TCP mode
- [MINOR] tcp_request: let the caller take care of errors and timeouts
- [CLEANUP] http: remove some commented out obsolete code in process_response
- [MINOR] update ebtree to version 4.1
- [MEDIUM] scheduler: get rid of the 4 trees thanks and use ebtree v4.1
- [BUG] sched: don't leave 3 lasts tasks unprocessed when niced tasks are present
- [BUG] scheduler: fix improper handling of duplicates __task_queue()
- [MINOR] sched: permit a task to stay up between calls
- [MINOR] task: keep a task count and clean up task creators
- [MINOR] stats: report number of tasks (active and running)
- [BUG] server check intervals must not be null
- [OPTIM] stream_sock: don't retry to read after a large read
- [OPTIM] buffer: new BF_READ_DONTWAIT flag reduces EAGAIN rates
- [MEDIUM] session: don't resync FSMs on non-interesting changes
- [BUG] check for global.maxconn before doing accept()
- [OPTIM] sepoll: do not re-check whole list upon accepts
Sometimes it may make sense to be able to immediately apply a verdict
without waiting at all. It was not possible because no inspect-delay
meant no inspection at all. This is now fixed.
When a backend has no LB algo specified and is not in dispatch, proxy
nor transparent mode, use "balance roundrobin" by default instead of
complaining. This will be particularly useful with stats and redirects.
Released version 1.3.16-rc1 with the following main changes :
- appsessions: cleanup DEBUG_HASH and initialize request_counter
- [MINOR] acl: add new keyword "connslots"
- [MINOR] cfgparse: fix off-by 2 in error message size
- [BUILD] fix build with gcc 4.3
- [BUILD] fix MANDIR default location to match documentation
- [TESTS] add a debug patch to help trigger the stats bug
- [BUG] Flush buffers also where there are exactly 0 bytes left
- [MINOR] Allow to specify a domain for a cookie
- [BUG/CLEANUP] cookiedomain -> cookie_domain rename + free(p->cookie_domain)
- [MEDIUM] Fix memory freeing at exit
- [MEDIUM] Fix memory freeing at exit, part 2
- [BUG] Fix listen & more of 2 couples <ip>:<port>
- [DOC] remove buggy comment for use_backend
- [CRITICAL] fix server state tracking: it was O(n!) instead of O(n)
- [MEDIUM] add support for URI hash depth and length limits
- [MINOR] permit renaming of x-forwarded-for header
- [BUILD] fix Makefile.bsd and Makefile.osx for stream_interface
- [BUILD] Haproxy won't compile if DEBUG_FULL is defined
- [MEDIUM] upgrade to ebtree v4.0
- [DOC] update the README file with new build options
- [MEDIUM] reduce risk of event starvation in ev_sepoll
- [MEDIUM] detect streaming buffers and tag them as such
- [MEDIUM] add support for conditional HTTP redirection
- [BUILD] make install should depend on haproxy not "all"
- [DEBUG] add a TRACE macro to facilitate runtime data extraction
- [BUG] event pollers must not wait if a task exists in the run queue
- [BUG] queue management: wake oldest request in queues
- [BUG] log: reported queue position was offed-by-one
- [BUG] fix the dequeuing logic to ensure that all requests get served
- [DOC] documentation for the "retries" parameter was missing.
- [MEDIUM] implement a monotonic internal clock
- [MEDIUM] further improve monotonic clock by check forward jumps
- [OPTIM] add branch prediction hints in list manipulations
- [MAJOR] replace ultree with ebtree in wait-queues
- [BUG] we could segfault during exit while freeing uri_auths
- [BUG] wqueue: perform proper timeout comparisons with wrapping values
- [MINOR] introduce now_ms, the current date in milliseconds
- [BUG] disable buffer read timeout when reading stats
- [MEDIUM] rework the wait queue mechanism
- [BUILD] change declaration of base64tab to fix build with Intel C++
- [OPTIM] shrink wake_expired_tasks() by using task_wakeup()
- [MAJOR] use an ebtree instead of a list for the run queue
- [MEDIUM] introduce task->nice and boot access to statistics
- [OPTIM] task_queue: assume most consecutive timers are equal
- [BUILD] silent a warning in unlikely() with gcc 4.x
- [MAJOR] convert all expiration timers from timeval to ticks
- [BUG] use_backend would not correctly consider "unless"
- [TESTS] added test-acl.cfg to test some ACL combinations
- [MEDIUM] add support for configuration keyword registration
- [MEDIUM] modularize the global "stats" keyword configuration parser
- [MINOR] cfgparse: add support for warnings in external functions
- [MEDIUM] modularize the "timeout" keyword configuration parser
- [MAJOR] implement tcp request content inspection
- [MINOR] acl: add a new parsing function: parse_dotted_ver
- [MINOR] acl: add req_ssl_ver in TCP, to match an SSL version
- [CLEANUP] remove unused include/types/client.h
- [CLEANUP] remove many #include <types/xxx> from C files
- [CLEANUP] remove dependency on obsolete INTBITS macro
- [DOC] document the new "tcp-request" keyword and associated ACLs
- [MINOR] acl: add REQ_CONTENT to the list of default acls
- [MEDIUM] acl: permit fetch() functions to set the result themselves
- [MEDIUM] acl: get rid of dummy values in always_true/always_false
- [MINOR] acl: add the "wait_end" acl verb
- [MEDIUM] acl: enforce ACL type checking
- [MEDIUM] acl: set types on all currently known ACL verbs
- [MEDIUM] acl: when possible, report the name and requirements of ACLs in warnings
- [CLEANUP] remove 65 useless NULL checks before free
- [MEDIUM] memory: update pool_free2() to support NULL pointers
- [MEDIUM] buffers: ensure buffer_shut* are properly called upon shutdowns
- [MEDIUM] process_srv: rely on buffer flags for client shutdown
- [MEDIUM] process_srv: don't rely at all on client state
- [MEDIUM] process_cli: don't rely at all on server state
- [BUG] fix segfault with url_param + check_post
- [BUG] server timeout was not considered in some circumstances
- [BUG] client timeout incorrectly rearmed while waiting for server
- [MAJOR] kill CL_STINSPECT and CL_STHEADERS (step 1)
- [MAJOR] get rid of SV_STANALYZE (step 2)
- [MEDIUM] simplify and centralize request timeout cancellation and request forwarding
- [MAJOR] completely separate HTTP and TCP states on the request path
- [BUG] fix recently introduced loop when client closes early
- [MAJOR] get rid of the SV_STHEADERS state
- [MAJOR] better separation of response processing and server state
- [MAJOR] clearly separate HTTP response processing from TCP server state
- [MEDIUM] remove unused references to {CL|SV}_STSHUT*
- [MINOR] term_trace: add better instrumentations to trace the code
- [BUG] ev_sepoll: closed file descriptors could persist in the spec list
- [BUG] process_response must not enable the read FD
- [BUG] buffers: remove BF_MAY_CONNECT and fix forwarding issue
- [BUG] process_response: do not touch srv_state
- [BUG] maintain_proxies must not disable backends
- [CLEANUP] get rid of BF_SHUT*_PENDING
- [MEDIUM] buffers: add BF_EMPTY and BF_FULL to remove dependency on req/rep->l
- [MAJOR] process_session: rely only on buffer flags
- [MEDIUM] use buffer->wex instead of buffer->cex for connect timeout
- [MEDIUM] centralize buffer timeout checks at the top of process_session
- [MINOR] ensure the termination flags are set by process_xxx
- [MEDIUM] session: move the analysis bit field to the buffer
- [OPTIM] process_cli/process_srv: reduce the number of tests
- [BUG] regparm is broken on gcc < 3
- [BUILD] fix warning in proto_tcp.c with gcc >= 4
- [MEDIUM] merge inspect_exp and txn->exp into request buffer
- [BUG] process_cli/process_srv: don't call shutdown when already done
- [BUG] process_request: HTTP body analysis must return zero if missing data
- [TESTS] test-fsm: 22 regression tests for state machines
- [BUG] Fix empty X-Forwarded-For header name when set in defaults section
- [BUG] fix harmless but wrong fd insertion sequence
- [MEDIUM] make it possible for analysers to follow the whole session
- [MAJOR] rework of the server FSM
- [OPTIM] remove useless fd_set(read) upon shutdown(write)
- [MEDIUM] massive cleanup of process_srv()
- [MEDIUM] second level of code cleanup for process_srv_data
- [MEDIUM] third cleanup and optimization of process_srv_data()
- [MEDIUM] process_srv_data: ensure that we always correctly re-arm timeouts
- [MEDIUM] stream_sock_process_data moved to stream_sock.c
- [MAJOR] make the client side use stream_sock_process_data()
- [MEDIUM] split stream_sock_process_data
- [OPTIM] stream_sock_read must check for null-reads more often
- [MINOR] only call flow analysers when their read side is connected.
- [MEDIUM] reintroduce BF_HIJACK with produce_content
- [MINOR] re-arrange buffer flags and rename some of them
- [MINOR] do not check for BF_SHUTR when computing write timeout
- [OPTIM] ev_sepoll: detect newly created FDs and check them once
- [OPTIM] reduce the number of calls to task_wakeup()
- [OPTIM] force inlining of large functions with gcc >= 3
- [MEDIUM] indicate a reason for a task wakeup
- [MINOR] change type of fdtab[]->owner to void*
- [MAJOR] make stream sockets aware of the stream interface
- [MEDIUM] stream interface: add the ->shutw method as well as in and out buffers
- [MEDIUM] buffers: add BF_READ_ATTACHED and BF_ANA_TIMEOUT
- [MEDIUM] process_session: make use of the new buffer flags
- [CLEANUP] process_session: move debug outputs out of the critical loop
- [MEDIUM] move QUEUE and TAR timers to stream interfaces
- [OPTIM] add compiler hints in tick_is_expired()
- [MINOR] add buffer_check_timeouts() to check what timeouts have fired.
- [MEDIUM] use buffer_check_timeouts instead of stream_sock_check_timeouts()
- [MINOR] add an expiration flag to the stream_sock_interface
- [MAJOR] migrate the connection logic to stream interface
- [MAJOR] add a connection error state to the stream_interface
- [MEDIUM] add the SN_CURR_SESS flag to the session to track open sessions
- [MEDIUM] continue layering cleanups.
- [MEDIUM] stream_interface: added a DISconnected state between CON/EST and CLO
- [MEDIUM] remove stream_sock_update_data()
- [MINOR] maintain a global session list in order to ease debugging
- [BUG] shutw must imply close during a connect
- [MEDIUM] process shutw during connection attempt
- [MEDIUM] make the stream interface control the SHUT{R,W} bits
- [MAJOR] complete layer4/7 separation
- [CLEANUP] move the session-related functions to session.c
- [MINOR] call session->do_log() for logging
- [MINOR] replace the ambiguous client_return function by stream_int_return
- [MINOR] replace client_retnclose() with stream_int_retnclose()
- [MINOR] replace srv_close_with_err() with http_server_error()
- [MEDIUM] make the http server error function a pointer in the session
- [CLEANUP] session.c: removed some migration left-overs in sess_establish()
- [MINOR] stream_sock_data_finish() should not expose fd
- [MEDIUM] extract TCP request processing from HTTP
- [MEDIUM] extract the HTTP tarpit code from process_request().
- [MEDIUM] move the HTTP request body analyser out of process_request().
- [MEDIUM] rename process_request to http_process_request
- [BUG] fix forgotten server session counter
- [MINOR] declare process_session in session.h, not proto_http.h
- [MEDIUM] first pass of lifting to proto_uxst.c:uxst_event_accept()
- [MINOR] add an analyser code for UNIX stats request
- [MINOR] pre-set analyser flags on the listener at registration time
- [BUG] do not forward close from cons to prod with analysers
- [MEDIUM] ensure that sock->shutw() also closes read for init states
- [MINOR] add an analyser state in struct session
- [MAJOR] make unix sockets work again with stats
- [MEDIUM] remove cli_fd, srv_fd, cli_state and srv_state from the session
- [MINOR] move the listener reference from fd to session
- [MEDIUM] reference the current hijack function in the buffer itself
- [MINOR] slightly rebalance stats_dump_{raw,http}
- [MINOR] add a new back-reference type : struct bref
- [MINOR] add back-references to sessions for later use by a dumper.
- [MEDIUM] add support for "show sess" in unix stats socket
- [BUG] do not release the connection slot during a retry
- [BUG] dynamic connection throttling could return a max of zero conns
- [BUG] do not try to pause backends during reload
- [BUG] ensure that listeners from disabled proxies are correctly unbound.
- [BUG] acl-related keywords are not allowed in defaults sections
- [BUG] cookie capture is declared in the frontend but checked on the backend
- [BUG] critical errors should be reported even in daemon mode
- [MINOR] redirect: add support for the "drop-query" option
- [MINOR] redirect: add support for "set-cookie" and "clear-cookie"
- [MINOR] redirect: in prefix mode a "/" means not to change the URI
- [BUG] do not dequeue requests on a dead server
- [BUG] do not dequeue the backend's pending connections on a dead server
- [MINOR] stats: indicate if a task is running in "show sess"
- [BUG] check timeout must not be changed if timeout.check is not set
- [BUG] "option transparent" is for backend, not frontend !
- [MINOR] transfer errors were not reported anymore in data phase
- [MEDIUM] add a send limit to a buffer
- [MEDIUM] don't report buffer timeout when there is I/O activity
- [MEDIUM] indicate when we don't care about read timeout
- [MINOR] add flags to indicate when a stream interface is waiting for space/data
- [MEDIUM] enable inter-stream_interface wakeup calls
- [MAJOR] implement autonomous inter-socket forwarding
- [MINOR] add the splice_len member to the buffer struct in preparation of splice support
- [MEDIUM] stream_sock: factor out the return path in case of no-writes
- [MEDIUM] i/o: rework ->to_forward and ->send_max
- [OPTIM] stream_sock: do not ask for polling on EAGAIN if we have read
- [OPTIM] buffer: replace rlim by max_len
- [OPTIM] stream_sock: factor out the buffer full handling out of the loop
- [CLEANUP] replace a few occurrences of (flags & X) && !(flags & Y)
- [CLEANUP] stream_sock: move the write-nothing condition out of the loop
- [MEDIUM] split stream_sock_write() into callback and core functions
- [MEDIUM] stream_sock_read: call ->chk_snd whenever there are data pending
- [MINOR] stream_sock: fix a few wrong empty calculations
- [MEDIUM] stream_sock: try to send pending data on chk_snd()
- [MINOR] global.maxpipes: add the ability to reserve file descriptors for pipes
- [MEDIUM] splice: add configuration options and set global.maxpipes
- [MINOR] introduce structures required to support Linux kernel splicing
- [MEDIUM] add definitions for Linux kernel splicing
- [MAJOR] complete support for linux 2.6 kernel splicing
- [BUG] reserve some pipes for backends with splice enabled
- [MEDIUM] splice: add hints to support older buggy kernels
- [MEDIUM] introduce pipe pools
- [MEDIUM] splice: make use of pipe pools
- [STATS] report pipe usage in the statistics
- [OPTIM] make global.maxpipes default to global.maxconn/4 when not specified
- [BUILD] fix snapshot date extraction with negative timezones
- [MEDIUM] move global tuning options to the global structure
- [MEDIUM] splice: add the global "nosplice" option
- [BUILD] add USE_LINUX_SPLICE to enable LINUX_SPLICE on linux 2.6
- [BUG] we must not exit if protocol binding only returns a warning
- [MINOR] add support for bind interface name
- [BUG] inform the user when root is expected but not set
- [MEDIUM] add support for source interface binding
- [MEDIUM] add support for source interface binding at the server level
- [MEDIUM] implement bind-process to limit service presence by process
- [DOC] document maxpipes, nosplice, option splice-{auto,request,response}
- [DOC] filled the logging section of the configuration manual
- [DOC] document HTTP status codes
- [DOC] document a few missing info about errorfile
- [BUG] fix random memory corruption using "show sess"
- [BUG] fix unix socket processing of interrupted output
- [DOC] add diagrams of queuing and future ACL design
- [BUILD] proto_http did not build on gcc-2.95
- [BUG] the "source" keyword must first clear optional settings
- [BUG] global.tune.maxaccept must be limited even in mono-process mode
- [MINOR] ensure that http_msg_analyzer updates pointer to invalid char
- [MEDIUM] store a complete dump of request and response errors in proxies
- [MEDIUM] implement error dump on unix socket with "show errors"
- [DOC] document "show errors"
- [MINOR] errors dump must use user-visible date, not internal date.
- [MINOR] time: add __usec_to_1024th to convert usecs to 1024th of second
- [MINOR] add curr_sec_ms and curr_sec_ms_scaled for current second.
- [MEDIUM] measure and report session rate on frontend, backends and servers
- [BUG] the "connslots" keyword was matched as "connlots"
- [MINOR] acl: add 2 new verbs: fe_sess_rate and be_sess_rate
- [MEDIUM] implement "rate-limit sessions" for the frontend
- [BUG] interface binding: length must include the trailing zero
- [BUG] typo in timeout error reporting : report *res and not *err
- [OPTIM] maintain_proxies: only wake up when the frontend will be ready
- [OPTIM] rate-limit: cleaner behaviour on low rates and reduce consumption
- [BUG] switch server-side stream interface to close in case of abort
- [CLEANUP] remove last references to term_trace
- [OPTIM] freq_ctr: do not rotate the counters when reading
- [BUG] disable any analysers for monitoring requests
- [BUG] rate-limit in defaults section was ignored
- [BUG] task: fix handling of duplicate keys
- [OPTIM] task: don't unlink a task from a wait queue when waking it up
- [OPTIM] displace tasks in the wait queue only if absolutely needed
- [MEDIUM] minor update to the task api: let the scheduler queue itself
- [BUG] event_accept() must always wake the task up, even in health mode
- [CLEANUP] task: distinguish between clock ticks and timers
- [OPTIM] task: reduce the number of calls to task_queue()
- [OPTIM] do not re-check req buffer when only response has changed
- [CLEANUP] don't enable kernel splicing when socket is closed
- [CLEANUP] buffer_flush() was misleading, rename it as buffer_erase
- [MINOR] buffers: implement buffer_flush()
- [MEDIUM] rearrange forwarding condition to enable splice during analysis
- [BUILD] build fixes for Solaris
- [BUILD] proto_http did not build on gcc-2.95 (again)
- [CONTRIB] halog: fast log parser for haproxy
- [CONTRIB] halog: faster fgets() and add support for percentile reporting
The new "rate-limit sessions" statement sets a limit on the number of
new connections per second on the frontend. As it is extremely accurate
(about 0.1%), it is efficient at limiting resource abuse or DoS.
These new ACLs match frontend session rate and backend session rate.
Examples are provided in the doc to explain how to use that in order
to limit abuse of service.
With this change, all frontends, backends, and servers maintain a session
counter and a timer to compute a session rate over the last second. This
value will be very useful because it varies instantly and can be used to
check thresholds. This value is also reported in the stats in a new "rate"
column.
On overloaded systems, it sometimes happens that hundreds or thousands
of incoming connections are queued in the system's backlog, and all get
dequeued at once. The problem is that when haproxy processes them and
does not apply any limit, this can take some time and the internal date
does not progress, resulting in wrong timer measures for all sessions.
The most common effect of this is that all of these sessions report a
large request time (around several hundreds of ms) which is in fact
caused by the time spent accepting other connections. This might happen
on shared systems when the machine swaps.
For this reason, we finally apply a reasonable limit even in mono-process
mode. Accepting 100 connections at once is fast enough for extreme cases
and will not cause that much of a trouble when the system is saturated.
