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Installation Prerequisites

  • The individual performing this installation has some Linux experience.
  • NMIS8 is installed on the same server where opHA will be installed
  • NMIS8 is installed in /usr/local/nmis8
  • opHA will be installed into /usr/local/omk
  • Root access is available (not always needed but much easier)
  • Perl 5.10 
  • RRDtool 1.4.7
  • NMIS 8.3.24G or later
  • opHA will be installed onto the Master and each Slave NMIS server

Installation Steps

Install opHA Software

This step will be repeated for each NMIS master and slave server

  • Copy the opHA tarball to the slave or master NMIS server (a tarball is a GZIP'd tar file, e.g. opHA-2.0.2.tgz)
    1. You may need to use SCP or FTP to get the file onto the server.
  • The file will now likely be in the users home directory.
  • opHA will be installed into /usr/local/omk
unalias cp
cd /usr/local
tar xvf ~/opHA-<version>.tgz
# NB! If you get a message about timestamps in the future be sure to fix the clock on the server 
cd omk/

cp install/nmis/Access.opha.nmis/usr/local/nmis8/install
cp install/nmis/Tables.opha.nmis /usr/local/nmis8/install
cp install/nmis/Table-Nodes.opha.nmis /usr/local/nmis8/conf/Table-Nodes.nmis

cp install/nmis/BusinessServices.nmis /usr/local/nmis8/conf
cp install/nmis/Servers.nmis /usr/local/nmis8/conf
cp install/nmis/Customers.nmis /usr/local/nmis8/conf
cp install/nmis/ServiceStatus.nmis /usr/local/nmis8/conf
cp install/nmis/Tenants.nmis /usr/local/nmis8/conf
cp install/nmis/Table-* /usr/local/nmis8/conf
 
# Merge your current Access configuration with the opHA access configuration
/usr/local/nmis8/admin/updateconfig.pl /usr/local/omk/install/nmis/Access.nmis.opha /usr/local/nmis8/conf/Access.nmis 
/usr/local/nmis8/admin/updateconfig.pl /usr/local/omk/install/nmis/Tables.nmis.opha /usr/local/nmis8/conf/Tables.nmis 

/usr/local/nmis8/admin/fixperms.pl

cp install/omkd.init.d /etc/init.d/omkd
cp install/omk-rotate.conf /etc/logrotate.d/
cp install/opCommon.nmis conf/
cp install/users.dat conf/

chown -R nmis:nmis /usr/local/omk
  
chkconfig --add omkd
service omkd start

Verify that the daemon is running:

root@nmis64 script]# service omkd start
Starting omk daemon: 
[root@nmis64 script]# ps aux | grep opmantek
root 14949 1.1 3.0 213880 63504 pts/0 S 07:43 0:00 ./opmantek.pl daemon
root 14952 0.0 0.0 103224 864 pts/0 S+ 07:43 0:00 grep opmantek
[root@nmis64 script]#

If you do not see the daemon running, try this and look for the reason it is not working (skip this if everything above is fine)

cd script
./opmantek.pl daemon
# if that does not give you any errors and runs, CTRL+C and then run
./opmantek.sh
# now grep for the opmantek process again, also check the log files in /usr/local/omk/log

Verify that the date/time are correct 

 

date
# if they are not make sure the timezone is correct and run ntpdate
/etc/init.d/ntpdate start

 

Enter License and accept EULA

If the daemon is loaded and the installation has gone well you should now be able to load the opHA GUI, from http://server_name:8042/omk/opHA. This URL should present you with a webpage that allows you to enter a license key and accept a EULA.  This step will need to be completed on each opHA instance.  After successful license key and EULA acceptance you will be presented with a dashboard that looks like this:

opHA Authentication Model

The opHA daemon is configured with:

  • An opHA user and password, by default this is an Apache htpasswd file, defined in /usr/local/omk/conf/users.dat
  • The opHA user to use for the authentication, defined per Server in /usr/local/nmis8/conf/Servers.nmis (on the master if they are pulling, for the slaves if they are pushing)
  • An IP address list that defines who is allowed to connect to the daemon (depending on the operation a combination of ip address and login credentials is required)

This model enables you to use separate credentials for each slave or the same credentials for each slave, providing for simple configuration, and more secure configuration if required.

opHA Configuration

Server Name for opHA

Server names need to be lower case with no spaces, e.g. NMIS_Server24 is bad, nmis_server24 is good.

Now set the server name in Config.nmis, search for server_name: 

'server_name' => 'nmis_server24',

Add Servers to Servers.nmis

opHA supports slaves pushing updates or masters pulling updates (or both).  If you want a slave to have the ability to push, it needs to have the servers it should push to in it's Servers.nmis file.  Conversely if you want masters to be able to pull they need to have the slaves they should pull from in their Servers.nmis file.  At this point it is good to draw yourself a diagram (if you have not already) to aid you in configuring each master and slave.

In addtion: each server (master and slave) needs to have a localhost entry in Servers.nmis which tells the server how to log in to itself.

The Servers nmis file is located at /usr/local/nmis8/conf/Servers.nmis, you will need to add a section for each server the daemon will be connecting to.  The NMIS GUI can help you create these entries, to use it load up NMIS on the server you are configuring, and select "System->System Configuration->Servers" from the menu.

The default entries look like this:

'nmis1' => {
  'name' => 'nmis1', # what to name this server in the GUI
  'config' => 'Config.nmis', 
  'protocol' => 'http', # only HTTP is supported at this time
  'port' => '8042', # this should be the port that omkd runs on, set in opCommon, 'omkd_listen_port'
  'host' => 'nmis1.domain.com', # name/ip address omkd will use to connect to the server.  Must be FQDN or IP, hostname.local might work
  'user' => 'nmismst', # user omkd will connect to this server with
  'passwd' => 'C00kb00k' # password omkd will connect to this server with
  'portal_host' => 'vali.opmantek.com',
  'portal_port' => '80',
  'portal_protocol' => 'http',
  'cgi_url_base' => '/cgi-nmis8'  
}

Edit the entry to look like this, in this example the hostname of the slave is "vali":

 'vali' => {
   'name' => 'vali',
   'config' => 'Config.nmis',
   'protocol' => 'http',
   'port' => '8042',
   'host' => 'vali',
   'user' => 'nmismst',
   'passwd' => 'C00kb00k',
   'portal_host' => 'vali.opmantek.com',
   'portal_port' => '80',
   'portal_protocol' => 'http',
   'cgi_url_base' => '/cgi-nmis8'  
 }

There are many options in this configuration but unless you are wanting to change the defaults considerably most of them will not matter.  Currently using HTTPS is not supported in the protocol section.  You can use different user and passwd permissions here.

If you were presenting the Slave and needed to use an alternate connection, e.g. through a reverse proxy for presenting a portal, you would modify the portal_protocol, portal_port and portal_host accordingly.

Configure Authentication

  • To add new users see the documentation here for adding users to htpasswd, the htpasswd file for opHA is in /usr/local/omk/conf/
  • After you have the users configured you will need to modify /usr/local/omk/conf/opCommon.nmis, find the line "'opha_allowed_ips' => ['127.0.0.1'] and add the IP addresses of the opHA servers that are allowed to connect to the server you are configuring. 

For example, if we want to allow the servers at 192.168.1.42 and 192.168.2.42 to connect to this server, we add them to conf/opCommon.nmis like this:

'opha_allowed_ips' => ['127.0.0.1', '192.168.1.42', '192.168.2.42'],
NB!! : Restart the daemon (needed after any config change) 
service omkd restart

Testing Server Connections

Load the opHA dashboard (http://server_name:8042/omk/opHA/) and from the top menu, select "Views -> Servers".  You should now be presented with a list of servers that you have configured for this opHA instance.  There will be a column with links named "Test Sign In", select the server you would like to test, on successful sign in you will be presented with a page that says "Login Success".  If you do not see this you will get an error giving you a hint at what is happening.  You can use the logs in /usr/local/omk/log to help you determine what the issue is.

Refreshing the servers page after a successful signin will show the date of the last successful signin (as well as the last login error and last update).

IMPORTANT: If the date of either of your servers is not correct you will have an error signing in

Promoting NMIS to be a Master

By default, an NMIS server operates in standalone mode (which is also slave mode), to have NMIS behave in a masterly fashion, you will need to modify the configuration, so you can edit the NMIS Configuration item "sever_master" using your favourite text editor, edit this line and change from "false" to "true".

'server_master' => 'true',
'nmis_master_poll_cycle' => 'false' # this must be false

Adding Slave Groups to Master

On each slave you will need to determine which groups are currently in use.

[root@vali conf]# grep group_list /usr/local/nmis8/conf/Config.nmis
 'group_list' => 'HQ,HQDev',

This will result in a list of groups which need to be added to the NMIS Master, edit /usr/local/nmis8/conf/Config.nmis and add these groups to that list, this is a comma separated list.

 'group_list' => 'NMIS8,DataCenter,Branches,Sales,Campus,HeadOffice,HQ,HQDev',

Limiting Master Group Collection

opHA supports Multi-Master, that means you can have several masters collecting information from the same slaves if required.  This could be especially useful if you wanted to have one master with all groups on a slave, and another master with different groups from different slaves, effectively sharing some information between groups.

To do this you use the group property in the Servers.nmis file.  Edit the file and add the group property in and a regular expression in for the groups, this will take the form

'group' => 'Brisbane|Boston|Saratoga',

This will match all groups contain the sub-strings, Brisbane, Boston or Saratoga.  A complete server entry would look like this.

'demo' => {
  'name' => 'demo',
  'config' => 'Config',
  'protocol' => 'http',
  'port' => '8042',
  'host' => '192.168.1.42',
  'group' => 'Brisbane|Boston|Saratoga',
  'user' => 'nmismst',
  'passwd' => 'C00kb00k',
  'portal_host' => 'demo.opmantek.com',
  'portal_port' => '80',
  'portal_protocol' => 'http',
  'cgi_url_base' => '/cgi-nmis8' 
},

Test Push/Pull

There are several ways to verify that the transfers are working correctly:

  • use the GUI to do a pull or push (http://server_name:8042/omk/opHA/), select the server you want to push to or pull from (or select all to test them all) and press the appropriate button

    • the output will be a JSON document, with a hash entry for each successful file transfer: 

      {
  source: "vali",
  success: "Transfer complete",
  file_name: "nmis-summary8h",
  destination: "localhost"
},

    • On error there will be a hash entry with an error key along with information to help you solve the problem 

      {
  url: "http://vali:443/login",
  error: "Error signing in",
  server_signin_url: "http://localhost:8042/omk/opHA/servers/vali/signin",
  message: "Transaction was not a success.",
  server_name: "vali"
},
  • check the logs and watch the transfers happen
  • view the list of configured servers and check the "Last Update" column

Running a Master Collection

There are two options to run opHA, using Cron or a as a post process after a NMIS does a collect.  Pushes and pulls can be requested from anywhere, if they are requested from the localhost no authentication is required, if they are requested from elsewhere authentication is required.

Before you start make sure you have this in Config.nmis

'nmis_master_poll_cycle' => 'false',

To run from cron add this line to the  crontab which runs your nmis collections. This line will push or pull (depending on which one you pick) to all servers.  If you would only like to push or pull to a specific server replace "all" with the server name

*/2 * * * * wget http://localhost:8042/omk/opHA/servers/all/[push|pull] -o /dev/null# all servers
*/2 * * * * wget http://localhost:8042/omk/opHA/servers/vali/pull -o /dev/null # just pull server vali

This will get your collections running every 2 minutes regardless of other polling.

To run after an NMIS collect, put a script like this in /usr/local/nmis8/bin/nmis_post_proc.pl 

package pp;

require 5;
use strict;

sub doPP { 
 system("curl -s http://localhost:8042/omk/opHA/servers/all/pull");
 system("wget http://localhost:8042/omk/opHA/servers/all/pull -o /dev/null"); 
 return 1;
}

Logs

Logs can be found in /usr/local/omk/log or also viewed from the GUI at http://server_name:8042/omk/opHA/logs

Troubleshooting

  • check the logs
  • restart the daemon (required after any config changes)

  • run daemon from command line and see if the terminal has any helpful errors:

    /usr/local/omk/script/opmantek.pl daemon

Conclusion

After refreshing the web pages on the NMIS Master server you will see the data from the slaves.

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