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Top 5 Best, Free and Open-Source School Management Software

This article covers the school management software tools that are free, open-source, and are compatible with the leading operating systems. School management software solutions are the demand and need of every education system, i.e., from schools, colleges, universities, or any other institute, all the platforms require a management tool capable of keeping track of different administration activities. Though there is a variety of some very efficient and capable school management systems, such as Fedena, OpenSIS, SchoolTime, and many others, however, none of these are free and open-source both at the same time. Currently, very few school management tools come under the free and open-source software license and provide competitive school management features as well. Gibbon, SchoolTool, RosarioSIS, and TS School, all ensure efficient and competitive school management features and at the same time provide free and open-source software services to its users.

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"FATAL: no pg_hba.conf entry" – How to fix the PostgreSQL error ?

This article covers methods to resolve "FATAL: no pg_hba.conf entry" error. Basically, the "no pg_hba.conf entry" can happen due to missing entries in the configuration file. 


A quick way to fix this PostgreSQL server error is to do the following steps:

1. Add or edit the following line in your postgresql.conf :

listen_addresses = '*'

2. Add the following line as the first line of pg_hba.conf. It allows access to all databases for all users with an encrypted password:

# TYPE DATABASE USER CIDR-ADDRESS  METHOD
host  all  all 0.0.0.0/0 md5

3. Restart Postgresql after adding this with service postgresql restart or the equivalent command for your setup.

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"Login disallowed for security reasons" phppgadmin error – Fix it Now ?

This article covers how to resolve "Login disallowed for security reasons" phppgadmin error. Basically, the "Login disallowed for security reasons" error can happen when extra login security is enabled in the phpPgAdmin configuration file.


To fix this issue, You will need to edit the phppgadmin config file from following directory /etc/phppgadmin/config.inc.php.

Finally modify the line $conf['extra_login_security'] = true; to $conf['extra_login_security'] = false;

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Install Bcrypt in Docker and resolve related errors

This article covers how to install Bcrypt in Docker and fix relating Docker errors.

To fix bcrypt error on Docker:

The error looks like this,

internal/modules/cjs/loader.js:807
app_1 | return process.dlopen(module, path.toNamespacedPath(filename));

To resolve, simply Add the following lines of code to the start.sh file,

#!/usr/bin/env bash

# install new dependencies if any
npm install
# uninstall the current bcrypt modules
npm uninstall bcrypt
# install the bcrypt modules for the machine
npm install bcrypt
echo "Starting API server"
npm start

Here,

i. npm uninstall bcrypt would remove bcrypt modules for the other operating system.
ii. npm install bcrypt would install for the current machine that the app would be running on.

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Clear Solaris Service Maintenance Status in Nagios - Troubleshoot and Resolve

This article covers how to fix Clear Solaris Service Maintenance Status Nagios issue. Basically, When the Nagios Core service finds an invalid configuration, the core service will not start. 

To fix the problem you must fix the problem Nagios Core is complaining about.

This is normal behavior of Nagios Core, it is not specific to Solaris.

However on Solaris, after a service has failed to start several times, Solaris will put the service into what is called a Maintenance State. This state prevents a small problem from becoming a bigger problem. 

Even after fixing the problem Nagios Core is complaining about, you must also clear the maintenance state on the service before Solaris allows a service to be started again.

This means that the service is in a maintenance state, however there is not a lot of detail as to the cause of the issue except that the Start method failed repeatedly. 

It does however provide the name of a log file /var/svc/log/application-nagios:default.log.

Execute the following command to perform further troubleshooting:

tail -20 /var/svc/log/application-nagios:default.log


To Clear Maintenance State on Nagios:

1. Run the following command to clear the maintenance state:

$ svcadm clear nagios

2. Execute the following command to start Nagios:

$ svcadm enable nagios

3. Now check the state of the service:

$ svcs -xv nagios

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NTP amplification attack

This article will guide you on steps to mitigate this #NTP amplification attack. An Amplification Attack is any attack where an attacker is able to use an amplification factor to multiply its power. Examples of #amplification #attacks include Smurf Attacks (ICMP amplification), Fraggle Attacks (#UDP amplification), and DNS Amplification.

DNS flood is a type of Distributed Denial of Service (#DDoS) attack in which the attacker targets one or more Domain Name System (#DNS) servers belonging to a given zone, attempting to hamper resolution of resource records of that zone and its sub-zones.

To harden your DNS server:

1. Audit your DNS zones. First things first.

2. Keep your DNS servers up-to-date.

3. Hide BIND version.

4. Restrict Zone Transfers.

5. Disable DNS recursion to prevent DNS poisoning attacks.

6. Use isolated DNS servers.

7. Use a DDOS mitigation provider.

8. Two-Factor Authentication.

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