Author: admin

use cat /dev/null instead of rm

1) I check disk space.
[root@supp01 Adon_RHEL_4]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 1011M 464M 496M 49% /
/dev/sda1 99M 12M 82M 13% /boot
none 133M 0 132M 0% /dev/shm
/dev/sda6 494M 8.1M 460M 2% /tmp
/dev/sda2 2.0G 541M 1.3G 29% /usr
/dev/sda3 2.0G 614M 1.2G 33% /var
/dev/sda8 61G 960M 57G 2% /vmimages 2) I see that the VM is running and there are processes that have the file open.
[root@supp01 Adon_RHEL_4]# fuser vmware.log
vmware.log: 571 572 573 19874 19875 19882 3) I fill up the file.
[root@supp01 Adon_RHEL_4]# cat /dev/zero >> vmware.log
cat: write error: No space left on device 4) The filesystem is full.
[root@supp01 Adon_RHEL_4]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 1011M 1012M 0 100% /
/dev/sda1 99M 12M 82M 13% /boot
none 133M 0 132M 0% /dev/shm
/dev/sda6 494M 8.1M 460M 2% /tmp
/dev/sda2 2.0G 541M 1.3G 29% /usr
/dev/sda3 2.0G 614M 1.2G 33% /var
/dev/sda8 61G 960M 57G 2% /vmimages 5) I wipe the file out.
[root@supp01 Adon_RHEL_4]# cat /dev/null > vmware.log 6) I no longer have a full filesystem anymore.
[root@supp01 Adon_RHEL_4]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 1011M 464M 496M 49% /
/dev/sda1 99M 12M 82M 13% /boot
none 133M 0 132M 0% /dev/shm
/dev/sda6 494M 8.1M 460M 2% /tmp
/dev/sda2 2.0G 541M 1.3G 29% /usr
/dev/sda3 2.0G 614M 1.2G 33% /var
/dev/sda8 61G 960M 57G 2% /vmimages 7) Processes still have the file open.
[root@supp01 Adon_RHEL_4]# fuser vmware.log
vmware.log: 571 572 573 19874 19875 19882]]>

How to update ESX 3 with yum

esxupdate –force –easy -r http://host.domain.com/build/esx/esx301 … epos.32039 update If not outright stupid, it is a bit idiotic to do this on a production box. What you can do is point your yum.conf to the CentOS servers and download their updates for Redhat Enterprise Linux and update the packages since ESX is just a modified version of Redhat. Here’s how you do it. [base]
name=CentOS-$releasever – Base
baseurl=http://mirror.centos.org/centos/3.8/os/$basearch/ #released updates
[update]
name=CentOS-$releasever – Updates
baseurl=http://mirror.centos.org/centos/3.8/updates/$basearch/]]>

Postfix SASL w/ Cyrus / LDAP

testsaslauthd -u alton -p If that’s not working, you may need to set the configuration file – probably /etc/sasl/saslauthd.conf You can use strace to see what it’s looking for. /usr/lib/sasl/smtpd.conf or /usr/lib/sasl2/smtpd.conf strace -o /tmp/postfix.txt -fael -p 1765
1765 is the process id for master. Oct 5 17:35:20 chunli postfix/smtpd[17574]: fatal: no SASL authentication mechanisms
Oct 5 17:35:21 chunli postfix/master[1765]: warning: process /usr/lib/postfix/smtpd pid 17574 exit status 1
Oct 5 17:35:21 chunli postfix/master[1765]: warning: /usr/lib/postfix/smtpd: bad command startup — throttling
Oct 5 17:37:37 chunli postfix/smtpd[17620]: warning: xsasl_cyrus_server_get_mechanism_list: no applicable SASL mechan
isms
Oct 5 18:17:04 chunli postfix/smtpd[20694]: unable to dlopen /usr/lib/sasl2/libdigestmd5.so.2: /usr/lib/sasl2/libdigestmd5.so.2: cannot open shared object file: No such file or directory
Oct 5 18:17:04 chunli postfix/smtpd[20694]: unable to dlopen /usr/lib/sasl2/libotp.so.2: /usr/lib/sasl2/libotp.so.2: cannot open shared object file: No such file or directory
Oct 5 18:17:04 chunli postfix/smtpd[20694]: unable to dlopen /usr/lib/sasl2/libsql.so.2: /usr/lib/sasl2/libsql.so.2: cannot open shared object file: No such file or directory Found the ones I needed in cyrus-sasl-plain-2.1.20-16tr.]]>

How to get tcpdump from Virtual Switches in ESX 3

1) Install VMware-esx-supptools-3.0.0-1.i386.rpm from the ESX 3 cd.

2) You can then run “/usr/lib/vmware/support/esxnet-support man” and learn how to use the tool, but …

3) To get a trace from the portgroup, you’ll need to run:

/usr/lib/vmware/support/esxnet-support trace -z -p Network0

Network0 of course will need to change to your portgroup name.

Another thing you can do is create a portgroup and put it in promiscuous mode. Then, run tcpdump in that guest that’s in that portgroup.

vmx file parameters

http://www.vmts.net/article/parameters.htm monitor_control.disable_apic= “TRUE” |”FALSE”
Disable VM APIC (interupt) Mode workload=”TerminalServices”
Enable support for Windows Terminal Service e Metaframe tools.syncTime= “TRUE” |”FALSE”
Enable/Disable Time Synchronization keyboard.typematicMinDelay = µs
Delay auto repeat autostart=”poweron”
Autostart VM when ESX start tools.remindInstall = “FALSE” |”TRUE”
Turning Off Warning about VMware Tools Version autostart.delay=”n”
Wait n seconds before to start autostop=”poweroff” | “poweron”
Autostop VM when ESX stop Gui.ExitOnCliHlt= “TRUE” |”FALSE”
Wait n seconds before to stop autostop=”poweroff” | “poweron”
Autostop VM when ESX stop autostop.delay=”n”
Wait n seconds before to stop gui.restricted = “TRUE” |”FALSE”
restrict user access to the GUI edit logging = “FALSE”
Disabling Logging for a Virtual Machine Created by ESX Server log.filename = logfile
Changing the Virtual Machine’s Log File Location on a GSX Server
for Linux Host or ESX Server System gui.maxconnection = “n”
Set n console max connection svga.noOffscreen =”TRUE” | “FALSE”
enables/disables the off-screen display buffer for a VM]]>

VMs don’t power up in Cluster in a Box ESX 3 – new disks.

http://kb.vmware.com/vmtnkb/search.do?c … SAL_Public Error message: Cannot open the disk ‘/vmfs/volumes//my.vmdk’ or one of the snapshot disks
it depends on.
Reason: Invalid argument. Fix:
To fix this issue, run the command: # vmkfstools -c -d eagerzeroedthick This recreates the virtual machine without a lazy-zero configuration.]]>

damn … tried this and am getting:

The kernel defined by this directory of header files does not have the same

address space size as your running kernel.

Let’s see what happens if I recompile the kernel.