Een typische bedrijfscultuur

It's a rainy day

Eindelijk is de herfst in volle glorie begonnen. Regen, wind en koude temperaturen. De kippen echter volharden. Liever op de stok buiten dan in hun droog en warm hok. Ge zeit "een kieken" als je zo denkt.

mount windows share

sudo smbmount //<hostname>/<sharename> <mounting point> -o username=<username>,password=<password>,uid=1000,mask=000

Level 2 network info (physical status)

#dladm show-dev
bge0 link: up speed: 1000 Mbps duplex: full
bge1 link: up speed: 100 Mbps duplex: half
nxge0 link: up speed: 1000 Mbps duplex: full
nxge1 link: unknown speed: 1000 Mbps duplex: full
nxge2 link: unknown speed: 1000 Mbps duplex: full
nxge3 link: down speed: 1000 Mbps duplex: full
nxge4 link: up speed: 1000 Mbps duplex: full
nxge5 link: unknown speed: 1000 Mbps duplex: full
nxge6 link: up speed: 1000 Mbps duplex: full
nxge7 link: up speed: 100 Mbps duplex: full
clprivnet0 link: unknown speed: 0 Mbps duplex: unknown

How to check status of cluster and network

when there were issues on the network, it could be that your devices went bezerk and the networkdevices are loosing their IP. plumbing could fail and the only thing you can do is to reboot via "init 6".

Best to check via the console the bootsequence in order to trace duplicate IP's

once the machine is rebooted you can perform next commands:

ifconfig -a

cluster status

scstat

Here you will see the current status whether or not it is all returned to OK.

Create ISO from DVD Vob Files

How to make a dvd iso from a /directory/ with VIDEO_TS and AUDIO_TS directories:

mkisofs -dvd-video -udf -o dvd.iso /directory/
All filesnames must be in capital letters. If you are using FAT32, you need to add shortname=mixed to the filesystem.

Less known Solaris features: Getting rid of Zombies

Once in a while you will see some strange processes with <defunct> instead of a process name. This happens when a child process terminates, but the parent process isn´t interested in the outcome because it didn´t waited for the childs response. Almost all resources of the child process are freed up at the moment with the exception of the entry in the process table. The parent process need it to get the exit code from it´s child, thus you can´t simply delete it on the termination of the child. The remaining process table entry will be delete, when the parent proccess reaps the child process by gathering the exit code. But when the parent forgets to reap the child, it´s undead, it´s defunct. Or to stay in the terminology: You´ve produced a Zombie process.

Let´s create such a process. It´s really easy, we just have to create a long running process forking away a child but we don´t use the wait() system call to gather it´s response at the exit.

bash-3.2$ nohup perl -e "if (fork()>0) {while (1) {sleep 100*100;};};"&

Okay, let´s check for our processes. In the output of ps -ecl the zombie processes are marked with a Z:

bash-3.2$ ps -ecl |grep "Z"
 F S    UID   PID  PPID  CLS PRI     ADDR     SZ    WCHAN TTY         TIME CMD
 0 Z    100 27841 27840    -   0        -      0        - ?           0:00 <defunct>
bash-3.2$

A kill -9 to this process is without effect. Obviously, a zombie will go away when you terminate the parent process, but that isn´t alway an option. How can you get rid of this Zombies? Okay, with Solaris you can reap such processes manually. The preap forces the parent to reap the child by calling wait() system call on the child.

bash-3.2$ preap 27841
27841: exited with status 0

And when you look in the process table again you will see, that the zombie founds it´s peace...

bash-3.2$ ps -ecl |grep "Z"
 F S    UID   PID  PPID  CLS PRI     ADDR     SZ    WCHAN TTY         TIME CMD

Obviously, you should ask yourself, why an application leaves such zombie processes, when the task of reaping them away manually gets a frequent task. Often it´s because of bad programming style.