http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch14_:_Linux_Firewalls_Using_iptables
http://www.thegeekstuff.com/2009/06/how-to-disable-selinux-redhat-fedora-debian-unix/
http://www.cyberciti.biz/faq/disable-linux-firewall-under-centos-rhel-fedora/
http://www.servepath.com/support/redhat-securitychecklist.php
http://linuxhelp.blogspot.com/2006/04/enabling-and-disabling-services-during_01.html#axzz0f2M0zEs0
February 9, 2010
February 3, 2010
Install Thunderbird in Linux
Please refer: http://www.cyberciti.biz/faq/install-thunderbird-2-in-linux/
Installing openoffice on Redhat 5
Installation Steps
1. Review the System Requirements
2. You can download the rpm from the url: http://download.openoffice.org/index.html
Unpack the downloaded image into a directory. For example, currently, the following command would unpack into the current directory:
3. tar xvzf OOo_3.0.0_LinuxIntel_install_xxxxxx.tar.gz
This will create a source directory with the OpenOffice.org installation. The directory will have a rather long name but be prefixed by "OOO3...".
4. su to root, if necessary, and navigate to OpenOffice.org installation directory, the OOO3... source directory.
Since the default packaging of OpenOffice.org for Linux is RPM, you will likely need to be root to run the rpm command.
5. cd into the RPMS subdirectory of the source directory.
You should see a lot of rpms here and one sub-directory called "desktop-integration".
6. Install this new version by typing rpm -Uvih *rpm.
By default, this will install OpenOffice in your /opt directory.
NOTE: See additional installation options and other useful information in the Setup Guide.
7. Finally, cd to desktop-integration. Depending on your package manager/system, install the appropriate desktop interface.
1. Review the System Requirements
2. You can download the rpm from the url: http://download.openoffice.org/index.html
Unpack the downloaded image into a directory. For example, currently, the following command would unpack into the current directory:
3. tar xvzf OOo_3.0.0_LinuxIntel_install_xxxxxx.tar.gz
This will create a source directory with the OpenOffice.org installation. The directory will have a rather long name but be prefixed by "OOO3...".
4. su to root, if necessary, and navigate to OpenOffice.org installation directory, the OOO3... source directory.
Since the default packaging of OpenOffice.org for Linux is RPM, you will likely need to be root to run the rpm command.
5. cd into the RPMS subdirectory of the source directory.
You should see a lot of rpms here and one sub-directory called "desktop-integration".
6. Install this new version by typing rpm -Uvih *rpm.
By default, this will install OpenOffice in your /opt directory.
NOTE: See additional installation options and other useful information in the Setup Guide.
7. Finally, cd to desktop-integration. Depending on your package manager/system, install the appropriate desktop interface.
January 13, 2010
"IP is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Not enough storage is avaliable to process this command. " IP is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.
Please check some common fixes for this issue.
-----------------------------------------------------------------------------
1. First, in the registry, change the IRPStackSize, increase by 3 to 5.
- Start -> Run
- Type in "regedit" (without the quotation marks)
- Navigate to the following path by single left mouse clicking as you go:
- HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\lanmanserver\parameters
- Double-left mouse click on IRPStackSize
- In the event the IRPStackSize registry setting doesn't exist, create it by single left mouse clicking on "Edit" in the menu bar and then single left mouse click on "New" followed by a single left mouse click on "DWORD Value". The new value will then appear, name the value "IRPStackSize" (without quotation marks) and double left mouse click on the icon.
- Set the decimal under Base to 11 for NT and 2000, and 15 for XP - However, when setting the decimal under Base, you may want to increase it by three with-in the range (example: 11 to 14 and so on ,up to 15 for NT and 2000 - 12 to 15 up to 20 for XP) Try the defaults first and if you are still getting the error, try moving up the range until you no longer get the error.
- Close the Registry Editor and Reboot the computer after each edit.
Second, turn "Use simple file sharing" ON, reboot the machine, then turn it OFF and reboot the machine again.
In other words, cycle the sucker. Many changes in disk shares don't actually become effective until this is done.
To turn Simple File Sharing on or off in Windows XP Professional, follow these steps:
1. Double-click My Computer on the desktop.
2. On the Tools menu, click Folder Options.
3. Click the View tab, and then select the Use Simple File Sharing (Recommended) check box to turn on Simple File Sharing. (Clear this check box to turn off this feature.)
-----------------------------------------------------------------------------------------
2. Please check the PagedPoolSize in the registry on the server?
Start the registry editor (regedit.exe)
Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
Double click on PagedPoolSize and set to 0
Click OK
Close the registry editor
Reboot the machine
Setting the PagedPoolSize to 0 should allow NT to dynamically allocate memory.
--------------------------------------------------------------------------------------------
3. "Not enough server storage is available to process this command." error.
SYMPTOMS: When accessing shares on a server from a client, you may receive "Not enough server storage is available to process this command." error. You may receive this message and Event ID: 2011 after you install Norton Antivirus for Windows.
Resolution:
1) The registry value IRPstackSize may be not explicitly present.
To increase the value of the parameter, go to the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ LanmanServer\Parameters.
If the key is not present, choose Add Value in the Registry Editor.
The Value Name should be IRPStackSize and the Data Type is REG_DWORD.
2) Remove any unnecessary entries from this value in the registry, HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters\NullSessionPipes.
3) Disable Norton antivirus to see if that will fix the problem.
---------------------------------------------------------------------
4. "Not accessible. You may not have permission to use this network resource"
Symptom: Your WinXP, in a peer-to-peer network, may receive the following error when you double-click My Network Places/Computers Near Me: is not accessible. You may not have permission to use this network resource.
Resolution: 1) Enable NetBIOS over TCP/IP on one or more computers in the workgroup.
To do that, go to properties of Local Area Connection>properties of Internet Protocol (TCP/IP)>General> Advanced>WINS,
check Enable NetBIOS over TCP/IP (If you have a DHCP-assigned IP address, select Use NetBIOS setting from the DHCP server ).
2) Make sure the Computer Browser service is started.
-----------------------------------------------------------------------------
1. First, in the registry, change the IRPStackSize, increase by 3 to 5.
- Start -> Run
- Type in "regedit" (without the quotation marks)
- Navigate to the following path by single left mouse clicking as you go:
- HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\lanmanserver\parameters
- Double-left mouse click on IRPStackSize
- In the event the IRPStackSize registry setting doesn't exist, create it by single left mouse clicking on "Edit" in the menu bar and then single left mouse click on "New" followed by a single left mouse click on "DWORD Value". The new value will then appear, name the value "IRPStackSize" (without quotation marks) and double left mouse click on the icon.
- Set the decimal under Base to 11 for NT and 2000, and 15 for XP - However, when setting the decimal under Base, you may want to increase it by three with-in the range (example: 11 to 14 and so on ,up to 15 for NT and 2000 - 12 to 15 up to 20 for XP) Try the defaults first and if you are still getting the error, try moving up the range until you no longer get the error.
- Close the Registry Editor and Reboot the computer after each edit.
Second, turn "Use simple file sharing" ON, reboot the machine, then turn it OFF and reboot the machine again.
In other words, cycle the sucker. Many changes in disk shares don't actually become effective until this is done.
To turn Simple File Sharing on or off in Windows XP Professional, follow these steps:
1. Double-click My Computer on the desktop.
2. On the Tools menu, click Folder Options.
3. Click the View tab, and then select the Use Simple File Sharing (Recommended) check box to turn on Simple File Sharing. (Clear this check box to turn off this feature.)
-----------------------------------------------------------------------------------------
2. Please check the PagedPoolSize in the registry on the server?
Start the registry editor (regedit.exe)
Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
Double click on PagedPoolSize and set to 0
Click OK
Close the registry editor
Reboot the machine
Setting the PagedPoolSize to 0 should allow NT to dynamically allocate memory.
--------------------------------------------------------------------------------------------
3. "Not enough server storage is available to process this command." error.
SYMPTOMS: When accessing shares on a server from a client, you may receive "Not enough server storage is available to process this command." error. You may receive this message and Event ID: 2011 after you install Norton Antivirus for Windows.
Resolution:
1) The registry value IRPstackSize may be not explicitly present.
To increase the value of the parameter, go to the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ LanmanServer\Parameters.
If the key is not present, choose Add Value in the Registry Editor.
The Value Name should be IRPStackSize and the Data Type is REG_DWORD.
2) Remove any unnecessary entries from this value in the registry, HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters\NullSessionPipes.
3) Disable Norton antivirus to see if that will fix the problem.
---------------------------------------------------------------------
4. "Not accessible. You may not have permission to use this network resource"
Symptom: Your WinXP, in a peer-to-peer network, may receive the following error when you double-click My Network Places/Computers Near Me:
Resolution: 1) Enable NetBIOS over TCP/IP on one or more computers in the workgroup.
To do that, go to properties of Local Area Connection>properties of Internet Protocol (TCP/IP)>General> Advanced>WINS,
check Enable NetBIOS over TCP/IP (If you have a DHCP-assigned IP address, select Use NetBIOS setting from the DHCP server ).
2) Make sure the Computer Browser service is started.
January 11, 2010
Steps to allocate a maximum amount of disk space a user or group may use.
Configuration of disk usage quotas on Linux - Perform the following as root:
1. Edit file /etc/fstab to add qualifier "usrquota" or "grpquota" to the partition. The following file system mounting options can be specified in /etc/fstab
* To enable user quota support on a file system, add "usrquota" to the fourth field containing the word "defaults".
...
/dev/hda2 /home ext3 defaults,usrquota 1 1
...
* Replace "usrquota" with "grpquota", should you need group quota support on a file system.
...
/dev/hda2 /home ext3 defaults,grpquota 1 1
...
* Need both user quota and group quota support on a file system?
...
/dev/hda2 /home ext3 defaults,usrquota,grpquota 1 1
...
This enables user and group quotas support on the /home file system.
2. touch /partition/aquota.user
where the partition might be /home or some partition defined in /etc/fstab.
then
chmod 600 /partition/aquota.user
The file should be owned by root. Quotas may also be set for groups by using the file aquota.group
3. Re-boot or re-mount file partition with quotas.
* Re-boot: shutdown -r now
* Re-mount partition: mount -o remount /partition
After re-booting or re-mounting the file system, the partition will show up in the list of mounted filesystems as having quotas. Check /etc/mtab:
...
/dev/hda5 / ext3 rw,usrquota 0 0
...
4. quotacheck -vgum /partition
or
quotacheck -vguma
The options used are as follows:
* a — Check all quota-enabled, locally-mounted file systems
* v — Display verbose status information as the quota check proceeds
* u — Check user disk quota information
* g — Check group disk quota information
5. quotaon -av
System Response: /dev/hda6: user quotas turned on
quotaon - enable disk quotas on a file system.
quotaoff - turn off disk quotas for a file system.
6. edquota -u user_id
Edit directly using vi editor commands. (See below for more info.)
For example: edquota -u user1
* System Response (RH 7+):
Disk quotas for user user1 (uid 501):
Filesystem blocks soft hard inodes soft hard
/dev/hda5 1944 0 0 120 0 0
o blocks: 1k blocks
o inodes: Number of entries in directory file
o soft: Max number of blocks/inodes user may have on partition before warning is issued and grace persiod countdown begins.
If set to "0" (zero) then no limit is enforced.
o hard: Max number of blocks/inodes user may have on partition.
If set to "0" (zero) then no limit is enforced.
If editing group quotas: edquota -g group_name
To verify that the group quota has been set, use the command:
quota -g group_name
Also please note that quota is assigned in KB
7. List quotas:
quota -u user_id
For example: quota -u user1
System response:
Disk quotas for user user1 (uid 501):
Filesystem blocks quota limit grace files quota limit grace
/dev/hda6 992 50000 55000 71 10000 11000
If this does not respond similar to the above, then restart the computer: shutdown -r now
Quota Reports:
* Report on all users over quota limits: quota -q
* Quota summary report: repquota -a
*** Report for user quotas on device /dev/hda5
Block grace time: 7days; Inode grace time: 7days
Block limits File limits
User used soft hard grace used soft hard grace
----------------------------------------------------------------------
root -- 4335200 0 0 181502 0 0
bin -- 15644 0 0 101 0 0
...
user1 -- 1944 0 0 120 0 0
No limits shown with this user as limits are set to 0.
Cron:
Quotacheck should scan the file system via cronjob periodically (say, every week?). Add a script to the /etc/cron.weekly/ directory.
File: /etc/cron.weekly/runQuotacheck
* Linux Kernel 2.4: Red Hat 7.1 - Fedora Core 3:
#!/bin/bash
/sbin/quotacheck -vguma
* Linux Kernel 2.2: Red Hat 6/7.0:
#!/bin/bash
/sbin/quotacheck -v -a
(Remember to chmod +x /etc/cron.weekly/runQuotacheck)
Note: You can refer more details from the urls:
http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/custom-guide/ch-disk-quotas.html
http://www.yolinux.com/TUTORIALS/LinuxTutorialQuotas.html
1. Edit file /etc/fstab to add qualifier "usrquota" or "grpquota" to the partition. The following file system mounting options can be specified in /etc/fstab
* To enable user quota support on a file system, add "usrquota" to the fourth field containing the word "defaults".
...
/dev/hda2 /home ext3 defaults,usrquota 1 1
...
* Replace "usrquota" with "grpquota", should you need group quota support on a file system.
...
/dev/hda2 /home ext3 defaults,grpquota 1 1
...
* Need both user quota and group quota support on a file system?
...
/dev/hda2 /home ext3 defaults,usrquota,grpquota 1 1
...
This enables user and group quotas support on the /home file system.
2. touch /partition/aquota.user
where the partition might be /home or some partition defined in /etc/fstab.
then
chmod 600 /partition/aquota.user
The file should be owned by root. Quotas may also be set for groups by using the file aquota.group
3. Re-boot or re-mount file partition with quotas.
* Re-boot: shutdown -r now
* Re-mount partition: mount -o remount /partition
After re-booting or re-mounting the file system, the partition will show up in the list of mounted filesystems as having quotas. Check /etc/mtab:
...
/dev/hda5 / ext3 rw,usrquota 0 0
...
4. quotacheck -vgum /partition
or
quotacheck -vguma
The options used are as follows:
* a — Check all quota-enabled, locally-mounted file systems
* v — Display verbose status information as the quota check proceeds
* u — Check user disk quota information
* g — Check group disk quota information
5. quotaon -av
System Response: /dev/hda6: user quotas turned on
quotaon - enable disk quotas on a file system.
quotaoff - turn off disk quotas for a file system.
6. edquota -u user_id
Edit directly using vi editor commands. (See below for more info.)
For example: edquota -u user1
* System Response (RH 7+):
Disk quotas for user user1 (uid 501):
Filesystem blocks soft hard inodes soft hard
/dev/hda5 1944 0 0 120 0 0
o blocks: 1k blocks
o inodes: Number of entries in directory file
o soft: Max number of blocks/inodes user may have on partition before warning is issued and grace persiod countdown begins.
If set to "0" (zero) then no limit is enforced.
o hard: Max number of blocks/inodes user may have on partition.
If set to "0" (zero) then no limit is enforced.
If editing group quotas: edquota -g group_name
To verify that the group quota has been set, use the command:
quota -g group_name
Also please note that quota is assigned in KB
7. List quotas:
quota -u user_id
For example: quota -u user1
System response:
Disk quotas for user user1 (uid 501):
Filesystem blocks quota limit grace files quota limit grace
/dev/hda6 992 50000 55000 71 10000 11000
If this does not respond similar to the above, then restart the computer: shutdown -r now
Quota Reports:
* Report on all users over quota limits: quota -q
* Quota summary report: repquota -a
*** Report for user quotas on device /dev/hda5
Block grace time: 7days; Inode grace time: 7days
Block limits File limits
User used soft hard grace used soft hard grace
----------------------------------------------------------------------
root -- 4335200 0 0 181502 0 0
bin -- 15644 0 0 101 0 0
...
user1 -- 1944 0 0 120 0 0
No limits shown with this user as limits are set to 0.
Cron:
Quotacheck should scan the file system via cronjob periodically (say, every week?). Add a script to the /etc/cron.weekly/ directory.
File: /etc/cron.weekly/runQuotacheck
* Linux Kernel 2.4: Red Hat 7.1 - Fedora Core 3:
#!/bin/bash
/sbin/quotacheck -vguma
* Linux Kernel 2.2: Red Hat 6/7.0:
#!/bin/bash
/sbin/quotacheck -v -a
(Remember to chmod +x /etc/cron.weekly/runQuotacheck)
Note: You can refer more details from the urls:
http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/custom-guide/ch-disk-quotas.html
http://www.yolinux.com/TUTORIALS/LinuxTutorialQuotas.html
January 9, 2010
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