On Thu, Feb 18, 2016 at 10:57 AM, Willy Tarreau <[email protected]> wrote: > Hi Aleks, > > On Wed, Feb 17, 2016 at 04:30:06PM +0100, Aleksandar Lazic wrote: >> Hi. >> >> how difficult is it to be able to add "log stdout;" to haproxy? >> >> I ask because in some PaaS environment is it difficult to setup a >> dedicated user yust for haproxy. >> >> It fits also a little bit better to http://12factor.net/logs > > It's been discussed a few times in the past. The response is "no". > It's totally insane to emit logs to a blocking destination. Your > whole haproxy process will run at the speed of the logs consumer > and the log processing will incure its latency to the process. > > If one day we implement an synchronous stream logging task, this > could change, but for now we send immediate logs as datagrams in > order never to block. > > To get an idea about what it can look like with blocking logs, > simply run "haproxy -d 2>&1 | more" and don't press any key. > You'll quickly see that the system continues to accept new > connections and that they will randomly freeze at various steps. > > Regards, > Willy > >
My 2 cents: Some tools may be used for this purpose: Configure HAProxy to send logs to port 2000, then use: - socat: socat -u UDP-RECV:2000 - <133>Feb 18 11:27:02 haproxy[4134]: Proxy f started. <133>Feb 18 11:27:02 haproxy[4134]: Proxy b started. <133>Feb 18 11:27:02 haproxy[4134]: Proxy stats started. <129>Feb 18 11:27:02 haproxy[4134]: Server b/s is DOWN, reason: Layer4 connection problem, info: "Connection refused", check duration: 0ms. 0 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue. <128>Feb 18 11:27:02 haproxy[4134]: backend b has no server available! - netcat: netcat -l -k -u 2000 <133>Feb 18 11:28:17 haproxy[4303]: Proxy f started. <133>Feb 18 11:28:17 haproxy[4303]: Proxy b started. <133>Feb 18 11:28:17 haproxy[4303]: Proxy stats started. <129>Feb 18 11:28:17 haproxy[4303]: Server b/s is DOWN, reason: Layer4 connection problem, info: "Connection refused", check duration: 0ms. 0 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue. <128>Feb 18 11:28:17 haproxy[4303]: backend b has no server available! Baptiste
