Installing Nagios with MacPorts

A few quick notes on steps I took when installing Nagios from MacPorts. Most of this is given to you during the install, but there are a few missing steps that I’ve added here.I didn’t end up using it, after the installation, but I’ve got a few notes from what little usage I did after the install.

  1. Do the install:
    sudo port install nagios
    
  2. Edit /opt/local/apache2/conf/httpd.conf and add the following before any existing ScriptAlias directives:
    #
    # Nagios stuff
     
    ScriptAlias /nagios/cgi-bin/ "/opt/local/sbin/nagios/"
    <directory "/opt/local/sbin/nagios">
     AllowOverride None
        Options ExecCGI
        Order allow,deny
        Allow from all
        AuthName "Nagios Access"
        AuthType Basic
        AuthUserFile /opt/local/etc/nagios/htpasswd.users
        require valid-user
    </directory>
     
    Alias /nagios "/opt/local/share/nagios"
    <directory "/opt/local/share/nagios">
        Options None
        AllowOverride AuthConfig
        Order allow,deny
        Allow from all
    </directory>
     
    # End Nagios stuff
    #
  3. Back up the default config files, just in case:
    cd /opt/local/etc/nagios
    sudo mkdir sample
    sudo cp *.cfg-sample sample/
    cd objects
    sudo mkdir sample
    sudo cp *.cfg-sample sample/
    
  4. Rename the default config files:
    cd /opt/local/etc/nagios
    sudo -s
    for i in *cfg-sample; do mv $i `echo $i | sed -e s/cfg-sample/cfg/`; done;
    cd objects
    for i in *cfg-sample; do mv $i `echo $i | sed -e s/cfg-sample/cfg/`; done; exit
    
  5. Create an Apache password file for the ‘nagiosadmin’ user:
    sudo /opt/local/apache2/bin/htpasswd -c /opt/local/etc/nagios/htpasswd.users nagiosadmin
    
  6. Create a couple of directories that are needed:
    sudo mkdir -p /opt/local/var/nagios/spool/checkresults
    sudo chown -R nagios:nagios /opt/local/var/nagios/spool
    
  7. Add the www user to the nagios group so that Apache has write access to certain files, especially /opt/local/var/nagios/rw/nagios.cmd:
    sudo dscl . -append /Groups/nagios GroupMembership www
    sudo dscl . -append /Groups/nagios GroupMembership _www
    
  8. Test the config to make sure everything’s okay:
    sudo nagios -v /opt/local/etc/nagios/nagios.cfg
    
  9. Restart Apache and start the Nagios daemon:
    sudo /opt/local/apache2/bin/apachectl -k restart
    sudo /opt/local/var/nagios/nagios.init start
    
  10. If you want it to run at startup, enable the startup item:
    sudo launchctl load -w /Library/LaunchDaemons/org.macports.nagios.plist
    

Usage Notes

The documentation is of course geared toward a Linux install; directory names are different in a MacPorts install.

  • /usr/local/nagios/libexec/ is /opt/local/libexec/nagios/
  • /usr/local/nagios/etc/ is /opt/local/etc/nagios/
  • The startup script /etc/rc.d/init.d/nagios is at /opt/local/var/nagios/nagios.init
  • The binary location /usr/local/nagios/bin/nagios is /opt/local/bin/nagios

8 Replies to “Installing Nagios with MacPorts”

  1. I’m glad to stumble upon this. Any ideas which variants of OS X this’ll build and run on properly (Tiger Server, Leopard Client, … ?)

  2. I’m very appreciative someone is assuming the entire groundwork is laid by MacPorts to get this going, thanks a lot for this.
    Not to be anal or anything, I still don’t have this working yet in Snow Leopard or Leo(second fresh setup with 403 access denied errors) but it’s only been a short while I’ve been trying.
    For the sake of completeness, it seems a bit out of order that the nagios-specific ScriptAlias comes before the Alias additions to the file, is that required?
    It is obvious that a MacPorts-installed Apache2 is being installed as well, but that’s not mentioned.
    Also, step 4 assumes the working directory is /opt/local/etc/nagios, so you may want to throw in a “cd ..” at the beginning of that step.
    Please understand I just want to verify I’m doing the steps correctly before I tinker with users and chown(wasn’t there supposed to be a nagioscmd group as well?)

    1. I’ve fixed the mistake in step 4, thanks for that. I didn’t get very far with this, Nagios seems more painful to configure than any piece of software should ever be. For a network that’s constantly adding and updating devices, it’s not very useful.
      I can say I got the thing running successfully with these steps, but that’s about as far as I got with it.

  3. Awesome post. Thanks! A few minor comments…

    1. In step 6, -P must be lowercase:
    sudo mkdir -p /opt/local/var/nagios/spool/checkresults

    2. In step 5, sudo is repeated twice, and for those using the default apache install, htpasswd binary is located in the default path:
    sudo sudo /opt/local/apache2/bin/htpasswd -c /opt/local/etc/nagios/htpasswd.users nagiosadmin

    would then be:
    sudo htpasswd -c /opt/local/etc/nagios/htpasswd.users nagiosadmin

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