Re-attach NFS share on ESX after connection loss

ESXi 5.x

To remove a datastore:

1. To list the mounted datastores on the host:
 
# esxcli storage nfs list

2. Make a note of the NFS datastore from step 1. Run this command to delete the NFS mount:
 
# esxcli storage nfs remove -v NFS_Datastore_Name

Note: This operation does not delete the information on the share, it unmounts the share from the host. If the NFS datastore is being used by either a virtual machine or a third party script, you may see this error:

Error performing operation: NFS Error: Unable to Unmount filesystem: Busy.

3. To add the datastore, run this command to mount the NFS datastore: 

# esxcli storage nfs add -H NFS_IP|NFS_HOSTNAME -s Share_mount_point_on_the_NFS -v DatastoreName

On a working cluster, you only need to do this on one node, the others will pickup.
 

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BASH redirection

   1>filename
      # Redirect stdout to file "filename."
   1>>filename
      # Redirect and append stdout to file "filename."
   2>filename
      # Redirect stderr to file "filename."
   2>>filename
      # Redirect and append stderr to file "filename."
   &>filename
      # Redirect both stdout and stderr to file "filename."
      # This operator is now functional, as of Bash 4,
      # final release.

   M>N
     # "M" is a file descriptor, which defaults to 1,
     # if not explicitly set.
     # "N" is a filename.
     # File descriptor "M" is redirect to file "N."
   M>&N
     # "M" is a file descriptor, which defaults to 1,
     # if not set.
     # "N" is another file descriptor.

And there you go :-)

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Cisco ASA Firewall TCP connection flags

 


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External NTP sync for Domain Controllers

Long time, no see.

One more for the road :-)

This is to be done on the PDC emulator, usually your 1st DC.

1. Set registry values 

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\NtpServer [STRING] = "1st.fqdn.or.ip,0x1 2nd.fqdn.or.ip,0x1"
(space separated string, with ',0x1' after each entry) 

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\ReliableTimeSource [DWORD] = 1
(if this doesn't exist, don't create it) 

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\LocalNTP [DWORD] = 0
(if this doesn't exist, don't create it) 

HKLM\SYSTEM\CurrentControlSet\Services\W32Time\Config\AnnounceFlags [DWORD] = 5

2. Restart w32time

net stop w32time && net start w32time

3. Resync the time service

w32tm /resync /rediscover

4. Verify sync

w32tm /query /status

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Move Gnome panel between monitors

1. Right-click the panel you wish to move and select “Properties”.
2. Uncheck the “Expand” option under the “General” tab.
3. Grab one of the edges of the panel by clicking on the left or right end (top or bottom end for vertical panels).
4. Drag the bar to the desired screen and position.
5. Check the “Expand” option in the “Panel Properties” window and click “Close”.

All done!!

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SNMPCONFPATH

Using snmp utils for win32... where to put snmp*.conf?

Anywhere you want, just as long as you set env variable SNMPCONFPATH to wherever you place them.

Simple, hum??

dnsactual.sh FreeDNS client

Since ddclient is supposed to work with FreeDNS, but is not *actually* working on Ubuntu, changed to dnsactual.sh from afraid.org unix client listings.

Since there's no .deb, had to hack it.

location: /usr/local/bin
schedule: root crontab every minute

TOKEN="YOU WISH :-)"
PATH=/bin:/sbin:/usr/bin:/usr/sbin
IFACE=[PUBLIC-IF]

if test -f /etc/freedns/dnsactual.conf
then
CacheIP=$(cat /etc/freedns/dnsactual.conf)
fi

CurreIP=$(ifconfig $IFACE | grep -oEe "addr:[0-9\.]*" | cut -f 2 -d :)

if [ "$CurreIP" = "$CacheIP" ]
then
# Both IP are equal
echo "Update not required..."
else
# The IP has change
echo "Updating http://free.afraid.org with " $CurreIP
wget http://freedns.afraid.org/dynamic/update.php?$TOKEN -o /dev/null -O /dev/stdout
echo `date` "Updating log with IP " $CurreIP >> /var/log/dnsactual.log
fi
rm -f /etc/freedns/dnsactual.conf
echo $CurreIP > /etc/freedns/dnsactual.conf