Recently I installed JDK 6 on my CentOS instance. I noticed a weird service called jexec running on all run levels:
jexec 0:on 1:on 2:on 3:on 4:on 5:on 6:on
Googled and found this installation notes from Sun:
A new service script, named jexec, is added to /etc/init.d. This script allows users to directly execute any standalone JAR file that has an execution permission set.
OK, so it’s for executing jar files.. A tiny little bit more convenient than using java -jar, but no thanks, especially on a server.
One less thing to worry about: chkconfig –level 0123456 jexec off 
ssong Java Java, linux, vps
Needed a VPS for one of my websites, so I’ve been doing some research on various hosts and plans. Here is what I found, as a side-by-side comparison matrix. From various sources, the hosting companies listed here generally seem to have good reputation:
| |
Linode (XEN) |
RimuHosting (XEN) |
eApps (Virtuozzo) |
WiredTree (Virtuozzo, managed) |
LiquidWeb (Virtuozzo, managed) |
SliceHost (XEN) |
| Plan |
360 |
VPS1 |
VPS2 |
standard |
standard plus |
standard max |
VPS384 |
VPS Basic |
256 slice |
| Memory |
360MB |
160MB |
400MB |
160MB |
288MB |
432MB |
384MB |
384MB |
256MB |
| Disk |
12GB |
4GB |
4GB |
2GB |
4GB |
6GB |
40GB |
20GB |
10GB |
| Transfer |
200GB |
30GB |
40GB |
30GB |
60GB |
90GB |
600GB |
200GB |
100GB |
| IP |
1 |
1 |
2 |
1 |
1 |
1 |
4 |
4 |
1 |
| Price |
$20 |
$20 |
$30 |
$10 |
$20 |
$30 |
$44 |
$60 |
$20 |
My budget was around $20-$30 month, so I only listed the lower end plans of each host. Hopefully this can be helpful for someone who is looking for an entry-level VPS. Guess what host I chose at the end? 
Update: I ended up choosing Linode. I narrowed down to slicehost & linode; both hosts look good and have good reviews at webhostingtalk. Slicehost’s website and management console are more appealing. But slicehost only provides 64 bit environment, which uses more memory than a 32-bit system. Here is a comparison. Also see this thread at slicehost forum: Might I have to say goodbye to Slicehost? (64-bit vs. 32-bit). Linode provides both 32-bit and 64-bit systems. Besides, linode provides more resources for the same 20 bucks (especially memory: 360MB vs 256MB); linode has data centers at four different locations to choose from while slicehost has only one. So far I’m a happy customer with Linode.
ssong Web Hosting vps, Web Hosting