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Install NDOUtils in CentOS RHEL and fix related error
This article covers how to install NDOUtils in CentOS. NDOUtils is an addon for Nagios Core that allows you to export current and historical data from one or more Nagios Core instances to a MySQL database. NDOUtils is included with Nagios XI. A source in Nagios Network Analyzer is the data collector. Outside of Nagios Network Analyzer a source is the location where data is originating from.
NDOUtils uses the kernel message queue for transferring the data from Nagios to NDOUtils. We are going to increase the default values the Kernel boots with to ensure it operates optimally.
1. Downloading NDOUtils Source
cd /tmp
wget -O ndoutils.tar.gz https://github.com/NagiosEnterprises/ndoutils/releases/download/ndoutils-2.1.3/ndoutils-2.1.3.tar.gz
tar xzf ndoutils.tar.gz
2. Compile NDOUtils
cd /tmp/ndoutils-2.1.3/
./configure
make all
3. Install Binaries
This step installs the binary files.
make install
4. Initialize Database
This prepares the database for NDOUtils.
cd db/
./installdb -u 'ndoutils' -p 'ndoutils_password' -h 'localhost' -d nagios
cd ..
SSH Servers Clients and Keys - More about it now
This article covers important information about SSH Servers, Clients and Keys. Use SSH keys for authentication when you are connecting to your server, or even between your servers.
They can greatly simplify and increase the security of your login process.
When keys are implemented correctly they provide a secure, fast, and easy way of accessing your cloud server.
Turn off password authentication Linux:
With SSH key authentication configured and tested, you can disable password authentication for SSH all together to prevent brute-forcing. When logged in to your cloud server.
1. Open the SSH configuration file with the following command.
$ sudo nano /etc/ssh/sshd_config
2. Set the password authentication to no to disable clear text passwords.
PasswordAuthentication no
3. Check that public key authentication is enabled, just to be safe and not get locked out from your server. If you do find yourself unable to log in with SSH, you can always use the Web terminal control panel.
PubkeyAuthentication yes
Then save and exit the editor.
4. Restart the SSH service to apply the changes by using the command below.
$ sudo systemctl restart sshd
With that done your cloud server is now another step along towards security.
Malicious attempts to connect to your server will results in authentication rejection, as plain passwords are not allowed, and brute-forcing an RSA key is practically impossible.
Welcome to Emergency mode in Linux - Fix this boot error now
This article covers how to fix boot error, Welcome to Emergency mode in Linux. This issue happens after an emergency power outage on a server, a system crash, or similar situations.
The Emergency Mode sometime means that your file system may be corrupted.
In such cases, you will be left out with a prompt to go nowhere.
All you have to do is perform a file system check using,
fsck.ext4 /dev/sda3
where sda3 can be your partition and if you are using ext3 file system, change the command as follows:
fsck.ext3 /dev/sda3
About the partition number, Linux shows you the partition before arriving at the prompt.
This should solve the problem.
To fix Emergency Mode On Ubuntu:
1. use Ubuntu Live USB to boot, and open terminal:
$ sudo fsck.ext4 /dev/sda3
2. Adding sudo because it needs root permission.
(Replace ext4 with ext3 if applicable to you)
3. Cycle through the SDAs by changing the last number in the sda to see which file system has problems.
Ex: sda1, sda2, sda3, sda4, and so on
4. As I encountered, the problem might be with the 'home' directory.
5. Once you run the above command, you'll be prompted to fix the issue right inside the terminal itself.
6. Keep hitting y (for yes) until the end of the fix.
(or you can use -fy for automatically response yes to all.)
7. Navigate to the home folder of your sda using your files explorer.
(This will be mounted from the HDD since you are working with a Live USB)
8. Check inside 'home' if you can see all your files. If yes, then you're ready to reboot to your system (remove the Live USB).
Your system requires smb2 or higher Windows error - Fix it now
This article covers how to fix the Windows error 'Your system requires smb2 or higher'. SMB1 protocol is vulnerable and your system will give you a warning message saying that it requires SMB2.
Most Windows 10 users reported Your system requires SMB2 or higher error message on their PC.
SMB stands for Server Message Block, and it's a protocol for sharing files. The protocol has two versions, the SMB1, and the SMB2, and while both can be used, the latter is the more secure one.
To enable SMB2 on Windows 10:
Check if your system can install SMB2
1. Start PowerShell as administrator. Press the Windows Key+ X and select PowerShell (Admin).
2.Type Get-SmbServerConfiguration | Select EnableSMB2Protocol in the command prompt of the Window PowerShell and press Enter.
3. If your system can run SMB2 protocol, type windows features in the Search box and select Turn Windows features on or off.
4. Once the Windows Features window opens, check SMB1/CIFS File Sharing Support option and hit OK.
5. Restart your PC and check if the problem with SMB2 is resolved.
To enable SMB2 on Windows 10 using Powershell:
1. Start PowerShell as administrator. We already showed you how to do that in our previous solution.
2. Enter Set-SmbServerConfiguration –EnableSMB2Protocol $true and press Enter.
3. Press Y to confirm.
Map Network Drives or Shared Folders with Group Policy - How to do it
This article covers how to map network drives or shared folders with Group Policy.
Mapping network drives using Group Policy preferences is flexible, provides easy control over who receives the drive mappings, and has easy-to-use user interfaces, all of which are in stark contrast with the complexities associated with scripts.
To Set up drive mappings with Group Policy preferences:
1. Group Policy preferences are a set of extensions that increase the functionality of Group Policy Objects (GPOs).
2. Administrators can use them to deploy and manage applications on client computers with configurations targeted to specific users.
3. The Drive Maps policy in Group Policy preferences allows an administrator to manage drive letter mappings to network shares.
To Deploy item-level targeting with Group Policy preferences:
Item-level targeting (ILT) is a feature of Group Policy preferences that allows preference settings to be applied to individual users and/or computers dynamically. ILT allows an administrator to specify a list of conditions that must be met in order for a preference setting to be applied or removed to a user or computer object.
You can configure drive mapping, only users in the Product Managers group would receive the mapping.
1. Under the Common tab of the mapped drive properties, check the Item-level targeting option, and then click Targeting….
2. In the Targeting Editor window, click New Item and select Security Group.
3. Click the … button, and type in the name of the security group.
4. Click OK to close the Targeting Editor once you're finished adding items to the list.
resolvconf error resolv conf must be a symlink - Fix it Now
This article covers how to fix resolv.conf error which happens when we try to restart the BIND 9 server under Ubuntu Linux.
To fix Resolvconf error "resolvconf: Error: /etc/resolv.conf must be a symlink":
Open a terminal and run the following commands:
$ sudo rm /etc/resolv.conf
$ sudo ln -s ../run/resolvconf/resolv.conf /etc/resolv.conf
$ sudo resolvconf -u
As of Ubuntu 12.04 resolvconf is part of the base system.
You can recreate the needed symlink by running:
$ dpkg-reconfigure resolvconf
or by doing the following in a terminal.
$ sudo ln -nsf ../run/resolvconf/resolv.conf /etc/resolv.conf
Note that as of Ubuntu 12.10 resolvconf no longer aborts if /etc/resolv.conf is not a symlink. It does print a warning message, but this can be silenced by putting the line:
REPORT_ABSENT_SYMLINK=no
in /etc/default/resolvconf.
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