2014-10-27 CentOS7 on Hyper-V Core for Nagios

Post date: Oct 27, 2014 8:57:45 PM

The first thing I learned when attempting to set up a Hyper-V guest virtual server to run Nagios in a CentOS 7 environment was that the NetInstall ISO image doesn't work. I went down many a dark and dusty internet path trying to understand why and what to do about it so you don't have to. Don't use that ISO.

When I switched to trying to use the Everything ISO, it worked without any difficulty. That brings me to the second thing I learned: You can't download some ISOs from some mirrors on some networks. I ended up downloading it with bittorrent, which was faster and easier than trying to pull it in a single piece. This is what bittorrent was designed to be good for.

Once I started the virtual machine wizard with the CentOS Everything ISO, things were mostly smooth sailing, but there are were a couple things that might make your life easier if you didn't have to figure them out:

Setting up the environment and basic system:

I do some things with my servers you may not want to do. There are lots of docs to tell you how to do a CentOS installation to meet a certain goal, and many of them may better suit your needs. These are the steps I take, with hopefully enough detail on the motivations for it that you'll know whether it is right for you or not.

Setting up Nagios

This is definitely not the most secure way to set it up, but I decided that I'd follow a guide and this is what the guide showed:

yum install nagios*

Notice how my other yum commands had the "-y" argument? The -y argument keeps you from having to confirm that you want everything that comes with your request.  If you include it, you're going to agree to everything. With the asterisk there, you're getting a very big list of software and you should be aware of what you're agreeing to, so I don't recommend skipping the prompt for this one. This is what my install included:


  nagios.x86_64 0:3.5.1-1.el7                           nagios-common.x86_64 0:3.5.1-1.el7

  nagios-plugins-all.x86_64 0:2.0.1-1.el7               nagios-plugins-apt.x86_64 0:2.0.1-1.el7

  nagios-plugins-breeze.x86_64 0:2.0.1-1.el7            nagios-plugins-by_ssh.x86_64 0:2.0.1-1.el7

  nagios-plugins-dbi.x86_64 0:2.0.1-1.el7               nagios-plugins-dhcp.x86_64 0:2.0.1-1.el7

  nagios-plugins-disk_smb.x86_64 0:2.0.1-1.el7          nagios-plugins-dns.x86_64 0:2.0.1-1.el7

  nagios-plugins-flexlm.x86_64 0:2.0.1-1.el7            nagios-plugins-fping.x86_64 0:2.0.1-1.el7

  nagios-plugins-flexlm.x86_64 0:2.0.1-1.el7            nagios-plugins-fping.x86_64 0:2.0.1-1.el7

  nagios-plugins-http.x86_64 0:2.0.1-1.el7              nagios-plugins-icmp.x86_64 0:2.0.1-1.el7

  nagios-plugins-ifstatus.x86_64 0:2.0.1-1.el7          nagios-plugins-ircd.x86_64 0:2.0.1-1.el7

  nagios-plugins-log.x86_64 0:2.0.1-1.el7               nagios-plugins-mailq.x86_64 0:2.0.1-1.el7

  nagios-plugins-mysql.x86_64 0:2.0.1-1.el7             nagios-plugins-nagios.x86_64 0:2.0.1-1.el7

  nagios-plugins-ntp.x86_64 0:2.0.1-1.el7               nagios-plugins-ntp-perl.x86_64 0:2.0.1-1.el7

  nagios-plugins-oracle.x86_64 0:2.0.1-1.el7            nagios-plugins-overcr.x86_64 0:2.0.1-1.el7

  nagios-plugins-ping.x86_64 0:2.0.1-1.el7              nagios-plugins-procs.x86_64 0:2.0.1-1.el7

  nagios-plugins-rpc.x86_64 0:2.0.1-1.el7               nagios-plugins-sensors.x86_64 0:2.0.1-1.el7

  nagios-plugins-ssh.x86_64 0:2.0.1-1.el7               nagios-plugins-swap.x86_64 0:2.0.1-1.el7

  nagios-plugins-ups.x86_64 0:2.0.1-1.el7               nagios-plugins-uptime.x86_64 0:2.0.1-1.el7

  nagios-devel.x86_64 0:3.5.1-1.el7                     nagios-plugins.x86_64 0:2.0.1-1.el7

  nagios-plugins-bacula.x86_64 0:5.2.13-18.el7          nagios-plugins-bonding.x86_64 0:1.4-3.el7

  nagios-plugins-check-updates.x86_64 0:1.6.7-1.el7     nagios-plugins-cluster.x86_64 0:2.0.1-1.el7

  nagios-plugins-dig.x86_64 0:2.0.1-1.el7               nagios-plugins-disk.x86_64 0:2.0.1-1.el7

  nagios-plugins-dummy.x86_64 0:2.0.1-1.el7             nagios-plugins-file_age.x86_64 0:2.0.1-1.el7

  nagios-plugins-game.x86_64 0:2.0.1-1.el7              nagios-plugins-hpjd.x86_64 0:2.0.1-1.el7

  nagios-plugins-ide_smart.x86_64 0:2.0.1-1.el7         nagios-plugins-ifoperstatus.x86_64 0:2.0.1-1.el7

  nagios-plugins-ldap.x86_64 0:2.0.1-1.el7              nagios-plugins-load.x86_64 0:2.0.1-1.el7

  nagios-plugins-mrtg.x86_64 0:2.0.1-1.el7              nagios-plugins-mrtgtraf.x86_64 0:2.0.1-1.el7

  nagios-plugins-nrpe.x86_64 0:2.15-2.el7               nagios-plugins-nt.x86_64 0:2.0.1-1.el7

  nagios-plugins-nwstat.x86_64 0:2.0.1-1.el7            nagios-plugins-openmanage.x86_64 0:3.7.12-1.el7

  nagios-plugins-perl.x86_64 0:2.0.1-1.el7              nagios-plugins-pgsql.x86_64 0:2.0.1-1.el7

  nagios-plugins-radius.x86_64 0:2.0.1-1.el7            nagios-plugins-real.x86_64 0:2.0.1-1.el7

  nagios-plugins-smtp.x86_64 0:2.0.1-1.el7              nagios-plugins-snmp.x86_64 0:2.0.1-1.el7

  nagios-plugins-tcp.x86_64 0:2.0.1-1.el7               nagios-plugins-time.x86_64 0:2.0.1-1.el7

  nagios-plugins-users.x86_64 0:2.0.1-1.el7             nagios-plugins-wave.x86_64 0:2.0.1-1.el7

Dependency Installed:

  apr.x86_64 0:1.4.8-3.el7                            apr-util.x86_64 0:1.5.2-6.el7

  bind-libs.x86_64 32:9.9.4-14.el7                    bind-utils.x86_64 32:9.9.4-14.el7

  fontpackages-filesystem.noarch 0:1.44-8.el7         fping.x86_64 0:3.5-3.el7

  httpd-tools.x86_64 0:2.4.6-18.el7.centos            libX11.x86_64 0:1.6.0-2.1.el7

  libXpm.x86_64 0:3.5.10-5.1.el7                      libdbi.x86_64 0:0.8.4-6.el7

  libpng.x86_64 2:1.5.13-5.el7                        libsmbclient.x86_64 0:4.1.1-37.el7_0

  libtevent.x86_64 0:0.9.18-6.el7                     libtirpc.x86_64 0:0.2.4-0.3.el7

  libzip.x86_64 0:0.10.1-8.el7                        lm_sensors.x86_64 0:3.3.4-10.el7

  mailx.x86_64 0:12.5-11.el7                          net-snmp-libs.x86_64 1:5.7.2-18.el7

  ntpdate.x86_64 0:4.2.6p5-18.el7.centos              perl-Class-Accessor.noarch 0:0.34-12.el7

  perl-Digest.noarch 0:1.17-245.el7                   perl-Digest-HMAC.noarch 0:1.03-5.el7

  perl-Digest-SHA1.x86_64 0:2.13-9.el7                perl-Math-Calc-Units.noarch 0:1.07-9.el7

  perl-Nagios-Plugin.noarch 0:0.36-7.el7              perl-Net-SNMP.noarch 0:6.0.1-7.el7

  perl-Readonly-XS.x86_64 0:1.05-15.el7               perl-Socket6.x86_64 0:0.23-15.el7

  php.x86_64 0:5.4.16-23.el7_0.1                      php-cli.x86_64 0:5.4.16-23.el7_0.1

  pytalloc.x86_64 0:2.0.8-4.el7                       qstat.x86_64 0:2.11-13.20080912svn311.el7

  samba-client.x86_64 0:4.1.1-37.el7_0                samba-common.x86_64 0:4.1.1-37.el7_0

  autogen-libopts.x86_64 0:5.18-5.el7                 bacula-libs.x86_64 0:5.2.13-18.el7

  cups-libs.x86_64 1:1.6.3-14.el7                     fontconfig.x86_64 0:2.10.95-7.el7

  gd.x86_64 0:2.0.35-26.el7                           httpd.x86_64 0:2.4.6-18.el7.centos

  libX11-common.noarch 0:1.6.0-2.1.el7                libXau.x86_64 0:1.0.8-2.1.el7

  libjpeg-turbo.x86_64 0:1.2.90-5.el7                 libldb.x86_64 0:1.1.16-4.el7

  libtalloc.x86_64 0:2.0.8-4.el7                      libtdb.x86_64 0:1.2.12-3.el7

  libwbclient.x86_64 0:4.1.1-37.el7_0                 libxcb.x86_64 0:1.9-5.el7

  lm_sensors-libs.x86_64 0:3.3.4-10.el7               mailcap.noarch 0:2.1.41-2.el7

  net-snmp-utils.x86_64 1:5.7.2-18.el7                ntp.x86_64 0:4.2.6p5-18.el7.centos

  perl-Config-Tiny.noarch 0:2.14-7.el7                perl-Crypt-DES.x86_64 0:2.05-20.el7

  perl-Digest-MD5.x86_64 0:2.52-3.el7                 perl-Digest-SHA.x86_64 1:5.85-3.el7

  perl-Module-Implementation.noarch 0:0.06-6.el7      perl-Module-Runtime.noarch 0:0.013-4.el7

  perl-Params-Validate.x86_64 0:1.08-4.el7            perl-Readonly.noarch 0:1.03-22.el7

  perl-Sort-Versions.noarch 0:1.5-22.el7              perl-Try-Tiny.noarch 0:0.12-2.el7

  php-common.x86_64 0:5.4.16-23.el7_0.1               postgresql-libs.x86_64 0:9.2.7-1.el7

  radiusclient-ng.x86_64 0:0.5.6-9.el7                rpcbind.x86_64 0:0.2.0-23.el7

  samba-libs.x86_64 0:4.1.1-37.el7_0

And then I added npre:

yum install npre

An I configured httpd and nagios to run and started them:

systemctl start httpd nagios

systemctl enable httpd.service

chkconfig nagios on

And let them through the firewall:

firewall-cmd --permanent --zone=public --add-port=80/tcp

firewall-cmd --zone=public --add-port=80/tcp

firewall-cmd --permanent --zone=public --add-port=443/tcp

firewall-cmd --zone=public --add-port=443/tcp

Now you can browse to your server by IP address and add /nagios at the end, for example, the defaults are:

username: nagiosadmin

password: nagiosadmin

You'll need to change that password right away, so that's done with the command:

htpasswd -c /etc/nagios/passwd nagiosadmin

(You'll be prompted for the password.)