Skip to content

Recent Articles

8
Jan

TimEL: a new streaming API

The TimEL, a Java library specifically developed to ease the evaluation of time dependent expressions, comes to with a new streaming API allowing it to crunch very large amounts of data with a constant memory footprint!

Read moreRead more

15
Nov

Jetty on RHEL 7/CentOS 7

If you look around on the internet you may find a lot of blogs guiding you on the installation of Jetty in RHEL 7 (or CentOS) which require you to download a new fresh distribution of Jetty tarball.

Since Jetty is already packaged in RHEL 7, I’d rather use the packaged version instead of adding a new piece of software which I would need to maintain afterwards.

Below the procedure I’ve applied to get a working Jetty deployment integrated with systemd with multi instance support (that is you can deploy more instances of Jetty if you need to).

Read moreRead more

11
Oct

cyberz.org is now vleo.org

Back in the 90s I was used to hang out on the irc network, and there, for many years, I’ve used the cyberz nickname, hence cyberz.org.

But life goes on and a lot of things changed – including myself. So I’ve decided to get a new domain – vleo.org – so that’s why you are here!

24
Feb

SELinux: how to change default context of a directory

Sometimes you may want to override the default SELinux context for a given path.

This can be easily accomplished editing /etc/selinux/targeted/contexts/files/file_contexts.local adding an entry (which is made by a path regexp and the selinux content). Follows an example:

/path(/.*)? system_u:object_r:httpd_sys_content_t:s0

31
Oct

WebLogic 12c: very slow domain creation

When creating a new domain on Linux, does Weblogic gets stuck at the <BEA-141254> <Generating new domain directory in XXX> message?

Read moreRead more

3
Jan

Resuming an scp transfer

Got tired of scp’s inability to resume a large transfer? Try rsync over ssh:

rsync --rsh='ssh' -av --progress --partial sourcefile user@host:target

If you don’t want to remember the command line I’d suggest the following alias (to add to ~/.bash_profile):

Read moreRead more

17
Sep

How to expand a ZFS device

Nowadays virtual environment are very common, thus a hot increase of an existing drive into a virtual machine is a very common operation (roughly equivalent to a LUN expansion in SAN).

When you expand a zpool device, the new size won’t be immediately available to zfs, but you can easily request an expand with the following:

Read moreRead more

9
Sep

SMF Manifest for Oracle 12c DBMS on Solaris 11.1

Here’s the procedure for adding Oracle 12c DBMS as SMF service in Solaris 11.1, based on this guide. The version provided here is slightly modified for the sake of simplicity as It needs only the oracle.xml to run (no additional scripts or configuration are required).

The procedure should work even with previous versions of Oracle DBMS and Solaris 11/10 (untested).

Read moreRead more

17
Sep

Java State Machine (JSM): build your own Deterministic Finite Automaton in Java!

Some time ago I’ve built some code to declare Finite State Machines in Java in an annotated fashion so you wouldn’t have to bother yourself with state handling. Since it turned out that the code has been useful in more than a couple occasions, I’ve decided to share it.

JSM comes as a tiny jar with an easy to use interface.

— More to come here! —

29
Jun

Integrating Oracle and MySQL with Bacula

After putting your precious data into your preferred database (Oracle or MySQL if you’re here) your next worry should be how to back them up. Here Bacula comes to help as a valid opensource network enterprise backup system – but how to get it working with your database?

In this post you’ll find some scripts which I developed to integrate Oracle or MySQL seamlessly with Bacula, allowing it to:

  • Do (hot) full backup of the database
  • Do (hot) incremental backup (also known as incremental differential backup)
  • Do (hot) differential backup (also known as incremental cumulative backup)

Read moreRead more