[stunnel-users] performance configuration for rehl3 & JBoss

Jones Scott - sjones Scott.Jones at acxiom.com
Fri Dec 1 23:02:26 CET 2006

I am having problems will apache and stunnel being able to handle load.
I am using stunnel to encrypt my ajp traffic from apache to jboss.  This
helps me bridge our internal firewall.


But during load testing the system starts breaking down.  It takes about
1/5 the load to break down apache and stunnel, than directly against my
jboss node.


Any performance tuning recommendations would be great.

I am using stunnel straight out of the box.  I will place the
configuration file below.




; Sample stunnel configuration file by Michal Trojnara 2002-2006

; Some options used here may not be adequate for your particular

; Please make sure you understand them (especially the effect of chroot


; Certificate/key is needed in server mode and optional in client mode

;cert = /usr/local/stunnel/etc/stunnel/mail.pem

;key = /usr/local/stunnel/etc/stunnel/mail.pem


; Protocol version (all, SSLv2, SSLv3, TLSv1)

sslVersion = SSLv3


; Some security enhancements for UNIX systems - comment them out on

chroot = /usr/local/stunnel/var/lib/stunnel/

setuid = nobody

setgid = nogroup

; PID is created inside chroot jail

pid = /stunnel.pid


; Some performance tunings

socket = l:TCP_NODELAY=1

socket = r:TCP_NODELAY=1

;compression = rle


; Workaround for Eudora bug



; Authentication stuff

;verify = 2

; Don't forget to c_rehash CApath

; CApath is located inside chroot jail

CApath = certificates

; It's often easier to use CAfile

CAfile = /usr/local/stunnel/etc/stunnel/certs.pem

; Don't forget to c_rehash CRLpath

; CRLpath is located inside chroot jail

;CRLpath = /crls

; Alternatively you can use CRLfile

;CRLfile = /usr/local/stunnel/etc/stunnel/crls.pem


; Some debugging stuff useful for troubleshooting

;debug = 7

output = stunnel.log


; Use it for client mode

client = yes


; Service-level configuration



accept = 8009

connect = xxxx2:8009



accept = 1433

connect = XXXX1:443

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