The following patch will give the ability to tweak socket linger mode.
You can use this option with "option nolinger" inside fronted or backend
configuration declaration.
This will help in environments where lots of FIN_WAIT sockets are
encountered.
Since the timers have been changed, the timeouts for the default instance
have not been adjusted. This results in unspecified timeouts becoming zero
instead of infinite.
A log chain of if/else prevented many sanity checks from being
performed on TCP listeners, resulting in dangerous configs being
accepted. Removed the offending 'else'.
src/chtbl.c, src/hashpjw.c and src/list.c are distributed under
an obscure license. While Aleks and I believe that this license
is OK for haproxy, other people think it is not compatible with
the GPL.
Whether it is or not is not the problem. The fact that it rises
a doubt is sufficient for this problem to be addressed. Arnaud
Cornet rewrote the unclear parts with clean GPLv2 and LGPL code.
The hash algorithm has changed too and the code has been slightly
simplified in the process. A lot of care has been taken in order
to respect the original API as much as possible, including the
LGPL for the exportable parts.
The new code has not been thoroughly tested but it looks OK now.
Sometimes it may be desirable to automatically refresh the
stats page. Most browsers support the "Refresh:" header with
an interval in seconds. Specifying "stats refresh xxx" will
automatically add this header.
When a very large number of servers is configured (thousands),
shutting down many of them at once could lead to large number
of calls to recalc_server_map() which already takes some time.
This would result in an O(N^3) computation time, leading to
noticeable pauses on slow embedded CPUs on test platforms.
Instead, mark the map as dirty and recalc it only when needed.
The new "use_backend" keyword permits full content switching by the
use of ACLs. Its usage is simple :
use_backend <backend_name> {if|unless} <acl_cond>
It is now possible to read error messages from local files,
using the 'errorfile' keyword. Those files are read during
parsing, so there's no I/O involved. They make it possible
to return custom error messages with custom status and headers.
By default, epoll/kqueue used to return as many events as possible.
This could sometimes cause huge latencies (latencies of up to 400 ms
have been observed with many thousands of fds at once). Limiting the
number of events returned also reduces the latency by avoiding too
many blind processing. The value is set to 200 by default and can be
changed in the global section using the tune.maxpollevents parameter.
ETERNITY is not 0 anymore, so all timeouts will not be initialized
to ETERNITY by a simple calloc(). We have to explictly assign them.
This bug caused random session aborts.
The timeout functions were difficult to manipulate because they were
rounding results to the millisecond. Thus, it was difficult to compare
and to check what expired and what did not. Also, the comparison
functions were heavy with multiplies and divides by 1000. Now, all
timeouts are stored in timevals, reducing the number of operations
for updates and leading to cleaner and more efficient code.
Peter van Dijk contributed this patch which implements the "smtpchk"
option, which is to SMTP what "httpchk" is to HTTP. By default, it sends
"HELO localhost" to the servers, and waits for the 250 message, but it
can also send a specific request.
The new 'block' keyword makes it possible to block a request based on
ACL test results. Block accepts two optional arguments : 'if' <cond>
and 'unless' <cond>.
The request will be blocked with a 403 response if the condition is validated
(if) or if it is not (unless). Do not rely on this one too much, as it's more
of a proof of concept helping in developing other matches.
It is important when parsing configuration file to ensure that at
least one word is empty to mark the end of the line. This will be
required with ACLs in order to avoid reading past the end of line.
The rbtree-based wait queue consumes a lot of CPU. Use the ul2tree
instead. Lots of cleanups and code reorganizations made it possible
to reduce the task struct and simplify the code a bit.
The principle behind speculative I/O is to speculatively try to
perform I/O before registering the events in the system. This
considerably reduces the number of calls to epoll_ctl() and
sometimes even epoll_wait(), and manages to increase overall
performance by about 10%.
The new poller has been called "sepoll". It is used by default
on Linux when it works. A corresponding option "nosepoll" and
the command line argument "-ds" allow to disable it.
The fiprm and beprm were added to ease the transition between
a single listener mode to frontends+backends. They are no longer
needed and make the code a bit more complicated. Remove them.
Patch from Fabrice Dulaunoy. Explanation below, and script
merged in examples/.
This patch allow to put a different address in the check part for each
server (and not only a specific port)
I need this feature because I've a complex settings where, when a specific
farm goes down, I need to switch a set of other farm either if these other
farm behave perfectly well.
For that purpose, I've made a small PERL daemon with some REGEX or PORT
test which allow me to test a bunch of thing.
Patch from Bryan Germann for 1.2.17.
In some circumstances, it is useful not to add the X-Forwarded-For
header, for instance when the client is another reverse-proxy or
stunnel running on the same machine and which already adds it. This
patch adds the "except" keyword to the "forwardfor" option, allowing
to specify an address or network which will not be added to this
header.
Patch from Marcus Rueckert for 1.2.17 :
"I added the attached patch to haproxy. I don't have a static uid/gid for
haproxy so i need to specify the username/groupname to run it as non
root user."
It was difficult to find how to enter the "usesrc" keyword. Now the
configuration checker is a bit more friendly and tries to identify
most mistakes and gives some hints back.
The HTTP parser has been rewritten for better compliance to RFC2616.
The same parser is now usable for both requests and responses, and
it now supports HTTP/0.9 as well as multi-line headers. It has also
been improved for speed ; a typicial HTTP request is parsed in about
2 microseconds on a 1 GHz processor.
The monitor-uri check has been moved so that the requests are not
logged. The httpclose option now tries to change as little as
possible in the request, and does not affect the first header if
it is already set to 'close'. HTTP/0.9 requests are converted to
HTTP/1.0 before being forwarded.
Headers and request transformations are now distinct. The headers
list is updated after each insertion/removal/transformation. The
request is re-parsed and checked after each transformation. It is
not possible anymore to remove a request, and requests which lead
to invalid request lines are now rejected.
When a server has no port specified and there is a check
enabled on it, the check is disabled because the port is
unknown. However, people expect the "listen" line to set
the check port just like it sets the server's port. Now,
if a port is specified in the listen or in the first bind
and nowhere else, it will be used for the checks as well.
This patch from Sin Yu makes use of an rbtree for the wait queue,
which will solve the slowdown problem encountered when timeouts
are heterogenous in the configuration. The next step will be to
turn maintain_proxies() into a per-proxy task so that we won't
have to scan them all after each poll() loop.
Some options will need some checks (or initializations) to be performed
before starting everything. The cfg_opts table has been extended to
allow storing of options-dependant checks.
Most common options are now stored in an array which eases
the parsing and which also permits reporting of ignored
options depending on the proxy's capabilities (back/front).
The notion of capabilities has been added to the proxy so that we
know whether a proxy supports frontend, backend, or rulesets. Given
this, some parameters are optionnal, some are ignored with a warning
and others are forbidden. It is now possible to write valid two level
configs without binding to dummy address/ports.
The maxconn argument is used only for the listeners, and the
fullconn is used only for the backends. If unset, it inherits
maxconn's value which itself can inherit the default or the
global value (we might need to change this).
It is now possible to define an errorloc in the backend as well as
in the frontend. The backend's will be used first, and if undefined,
then the frontend's will be used instead. If none is used, then the
original error messages will be used.
HTTP error messages were all specific cases handled by an IF.
Now they are all in an array so that it will be easier to add
new ones. Also, the return functions now use chunks as inputs
so that it should be easier to provide alternative return
messages if needed.
Sin Yu's patch to permit to change the proxy from a regex was merged
with little changes :
- req_cap/rsp_cap are not reassigned to the new proxy, they stay
attached to the frontend
- the actions have been renamed "reqsetbe" and "reqisetbe" for
"set BackEnd".
- the buffer is not reset after the switch, instead, the headers are
parsed again by the backend
- in Sin's patch, it was theorically possible to switch multiple times,
but the switching track was lost, making it impossible to apply
server responsesin the reverse order. Now switching is limited to
1 action (separation between frontend and backend) but the filters
remain.
Now it will be extremely easy to add other switching conditions, such
as host matching, URI matching, etc...
There's still a hard work to be done on the logs and stats.
A proxy will be able to borrow parameters from another one.
In particular, the filters will be inheritable from another
proxy, and the backend parameters too.
Using the cttproxy kernel patch, it's possible to bind to any source
address. It is highly recommended to use the 03-natdel patch with the
other ones.
A new keyword appears as a complement to the "source" keyword : "usesrc".
The source address is mandatory and must be valid on the interface which
will see the packets. The "usesrc" option supports "client" (for full
client_ip:client_port spoofing), "client_ip" (for client_ip spoofing)
and any 'IP[:port]' combination to pretend to be another machine.
Right now, the source binding is missing from server health-checks if
set to another address. It must be implemented (think restricted firewalls).
The doc is still missing too.
As suggested by Markus Elfring, a few "const char *" have replaced
some "char *" declarations where a function is not expected to
modify a value. It does not change the code but it helps detecting
coding errors.
It is now possible to tarpit connections based on regex matches.
The tarpit timeout is equal to the contimeout. A 500 server error
response is faked, and the logs show the status flags as "PT" which
indicate the connection has been tarpitted.
This makes it possible to relay SSL connections in pure TCP instances while
ensuring the remote end really receives our data eventhough intermediate
agents (firewalls, proxies, ...) might acknowledge the connection.
Too many problem reports were caused by missing timeouts. While
there has never been any default value since version 1.0, having
no timeout is abnormal in networked environments, and will lead
to various problems such as CLOSE_WAIT sockets accumulating and
nasty things like this. For this reason, it's better to annoy
the users until they fix their configs than letting them run
buggy configurations.
The files are now stored under :
- include/haproxy for the generic includes
- include/types.h for the structures needed within prototypes
- include/proto.h for function prototypes and inline functions
- src/*.c for the C files
Most include files are now covered by LGPL. A last move still needs
to be done to put inline functions under GPL and not LGPL.
Version has been set to 1.3.0 in the code but some control still
needs to be done before releasing.
