Posts

Showing posts from June, 2009

ssh config file

alias hosts and specify options so don't have to prepend username like user@host.

Can use * as wildcard in hostname


Host prod
User troy
Port 22
HostName somehost.com
ForwardX11 yes
Compression yes

nawk

Created to parse HAProxy log for graphing
grep'd out the page requests of interest, then parsed the file to graph in Open Office

awk '{fu=gsub("/"," ",$9); print substr($1,6)" "$2" "$3" "$9" "$14" "$15" "substr($17,2)" "$18}' someTextFile.txt

fu=gsub("/"," ",$9) turns "3/4/5/6/7" into "3 4 5 6 7"

Configuring USB support for VirtualBox under Ubuntu 8.10 Intrepid Ibis

Extract private key from Java Keystore .jks and convert to PEM for OpenSSL

System.nanoTime() returns sporadic values on multi-processor Solaris on VMWare

Consecutive calls to System.nanoTime() return sporadic differences that are zero, negative, large/huge, and stuck/hung/frozen/not changing for long periods on multi-processor Solaris x86 on/under VMWare. This has not been reproduced on non-VMWare multi-processor systems and single-processor VMWare systems.

A trouble ticket was opened with VMWare and they indicated the %RDY was too high at 50 - 100% instead of 5%. They also recommend single-processor VMs vs. multi-processor VMs. The bottom line is that if the code does not run deterministically.


Yes nanoTime issues cause real errors

Dual processor Fedora 11 on VMWare does not exhibit zero, negative, or stuck nano times, so this appears to be a Solaris on VMWare issue.

So as it turns out the VMWare instance created for windows was reloaded with both Fedora 11 and Solaris 5.10 and none of them exhibited the issue. So it seems that the VM image defaults for Windows vs. Solaris may be the issue.

Dual processor Windows Server 2008 with Java 1.6.…

Setting up Stunnel for HAProxy SSL support

Stunnel requires OpenSSL

Solaris 10 already has OpenSSL, so skip the following part:

Download OpenSSL source here

$ cd /usr/local/util
$ wget ftp://ftp.sunfreeware.com/pub/freeware/intel/10/openssl-0.9.8k-sol10-x86-local.gz
$ gunzip openssl-0.9.8k-sol10-x86-local.gz
$ pkgadd -d openssl-0.9.8k-sol10-x86-local
$ rm openssl-0.9.8k-sol10-x86-local

If building from source:

OpenSSL requires Perl 5

$ perl -version
This is perl, v5.8.4 built for i86pc-solaris-64int
...


Build and install OpenSSL as follows:

$ ./config
$ make
$ make test
$ make install


OpenSSL installs in /usr/local/ssl by default.


Get Stunnel source here

The Stunnel version needs to be one that there is an HAProxy x-forwarded-for patch for, i.e., 4.22

$ cd /usr/local/util
$ wget http://www.stunnel.org/download/stunnel/src/stunnel-4.22.tar.gz
$ gunzip stunnel-4.22.tar.gz
$ tar -xvf stunnel-4.22.tar
$ rm stunnel-4.22.tar

Download appropriate Stunnel x-forwarded-for source IP patch from HAProxy site

$ wget http://haproxy.1wt.eu/download/patc…

Quartz EE SE open-source Job Scheduler

Home

Runs as stand-alone or in EE server.

Quartz is included in JBoss.

Supports cron type syntax, and is customizable.

Has JMX bean to list scheduled events and when they will trigger.

Backup solutions

TimeVault like Apple TimeMachine
rdiff-backup
amanda
flyback

tar

Oracle on Windows vs. *nix port redirect issue

Scheduling/timing errors under Solaris on AMD, not Intel

Package by Feature not by Layer

Loading new JAXB in old JRE