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API Node Installation

Overall Installation Steps

The high-level steps for installing and configuring N2SNS Api nodes are:

Ensure the installation pre-requisites are met.
Install the API package.
Perform any required post-installation steps.
Update the API configuration as desired.
Optionally, apply the recommended Apache security configuration.

Installation Pre-requisites

OS-specific Setup

Refer to the specific Red Hat or Debian instructions for any pre-requisites as required.

Apache 2

Apache 2 must be installed prior to installing the N2SNS API package. The package to install will depend on your OS type:

RHEL 8	Other RPM-based Systems	DEB-based Systems
`sudo dnf install httpd`	`sudo yum install httpd`	`sudo apt-get install apache2`

The N2SNS API package expects that the relevant Apache 2 configuration directory exists. Again, this varies depending on your OS type:

RPM-based Systems	DEB-based Systems
`/etc/httpd`	`/etc/apache2`

Finally, the apachectl program must exist (it is installed as part of the Apache 2 package) and Apache must be running.

Perl

The N2SNS API node requires several Perl packages to be available prior to installation. The package names may vary depending on your OS type:

RPM-based Systems DEB-based Systems

perl or perl-interpreter >= 1:5.12
perl(B)
perl(DBI)
perl(DBD::Pg)
perl(Data::Compare)
perl(Data::Dumper)
perl(Date::Format)
perl(DateTime::Format::Pg)
perl(Digest)
perl(Getopt::Long)
perl(JSON)
perl(List::MoreUtils)
perl(MIME::Base64)
perl(POSIX)
perl(Scalar::Util)
perl(Storable)
perl(Time::Local)
perl(XML::LibXML)
perl(boolean)
perl(strict)
perl(warnings) perl >= 5.12
perl-base
perl-modules
libdbi-perl
libdata-compare-perl
libtimedate-perl
libdatetime-format-pg-perl
libjson-perl
liblist-moreutils-perl
libxml-libxml-perl
libboolean-perl

RPM-based Systems	DEB-based Systems
`perl` or `perl-interpreter` >= 1:5.12 `perl(B)` `perl(DBI)` `perl(DBD::Pg)` `perl(Data::Compare)` `perl(Data::Dumper)` `perl(Date::Format)` `perl(DateTime::Format::Pg)` `perl(Digest)` `perl(Getopt::Long)` `perl(JSON)` `perl(List::MoreUtils)` `perl(MIME::Base64)` `perl(POSIX)` `perl(Scalar::Util)` `perl(Storable)` `perl(Time::Local)` `perl(XML::LibXML)` `perl(boolean)` `perl(strict)` `perl(warnings)`	`perl` >= 5.12 `perl-base` `perl-modules` `libdbi-perl` `libdata-compare-perl` `libtimedate-perl` `libdatetime-format-pg-perl` `libjson-perl` `liblist-moreutils-perl` `libxml-libxml-perl` `libboolean-perl`

For each of these packages (or with all as one command), execute the instructions specific to your operating system:

RHEL 8	Other RPM-based Systems	DEB-based Systems
`sudo dnf install <package(s)>`	`sudo yum install <package(s)>`	`sudo apt-get install <package(s)>`

Jarvis

The N-Squared application Jarvis must be installed. Follow the installation steps for this, noting any prerequisites.

The N2SNS API package also expects that the default Jarvis configuration directory exists:

/etc/jarvis

Installation Steps

Follow the appropriate installation steps depending on your installation sources.

From N-Squared Repository

Execute the instructions specific to your operating system:

RHEL 8	Other RPM-based Systems	DEB-based Systems
`sudo dnf install n2sns-api`	`sudo yum install n2sns-api`	`sudo apt-get install n2sns-api`

Post-Installation Steps

Database Integration

In the file /etc/jarvis/n2sns-api.xml, locate the following section:

        <database connect="dbi:Pg:dbname=n2in;host=REPLACE_WITH_DB_ADDRESS;port=REPLACE_WITH_DB_PORT" username="n2sns_web" password="REPLACE_WITH_DB_PASSWORD"/>

Replace the sentinel values as follows:

REPLACE_WITH_DB_ADDRESS must be updated to the address of the primary database node (or proxy) to connect to.
REPLACE_WITH_DB_PORT must be updated to the listening port configured for the primary database node (or proxy).
REPLACE_WITH_DB_PASSWORD must be updated to the n2sns_web database user’s password, as created during database preparation.

Firewall

The firewall (if any) on the API node must be updated to allow:

Inbound user and API requests on the listening Apache port(s).
Outbound database requests to the DB node(s).

The exact commands to do this will depend both on the firewall on your platform and also which port(s) are in use. For example, to allow the default Apache ports when using firewalld, the commands might be:

firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --zone=public --add-port=443/tcp --permanent
service firewalld restart

SELinux

If SELinux is in use, Apache must be allowed to initiate proxy connections. To enable this, execute:

sudo /usr/sbin/setsebool -P httpd_can_network_connect 1

Session Security

Jarvis allows for session security to be increased by configuring a number of configuration parameters. In particular, the following parameters may be updated:

app => csrf_protection
app => cross_origin_protection
app => xsrf_protection
app.sessiondb.parameter => Path
app.sessiondb.parameter => Domain
app.sessiondb.parameter => Secure

Refer to the Jarvis documentation for more details. Further information is also available in the documentation for the Perl modules CGI::Session and CGI::Cookie.