Install Zabbix agent on FreeNAS 11.x

There is no official Zabbix Agent binary for FreeNAS, so it has to be compiled from source on another machine. There are several options to do so, I decided to just spin up a FreeBSD Vagrant VM to build the binary.
This post is based on the post from [1] with some enhancements 

For more recent howto see here

Vagrant VM

Setup VM & Build Environment

1. Create Vagrantfile:

   Vagrant.configure("2") do |config|
     config.vm.box = "freebsd/FreeBSD-11.1-STABLE"
     config.vm.base_mac = "000000123456"
   end
   

2. Start VM: vagrant up
3. Enter VM: vagrant ssh
4. Install dependecies:

   sudo pkg install -y curl autoconf automake gettext gcc pcre
   

Compile Zabbix Agent

1. Download source: https://www.zabbix.com/download_sources#tab:40LTS

2. curl -fsSL "https://sourceforge.net/projects/zabbix/files/ZABBIX%20Latest%20Stable/3.4.14/zabbix-3.4.14.tar.gz/download" | tar zxvf -
   cd zabbix-3.4.14

   curl -fsSL "https://sourceforge.net/projects/zabbix/files/ZABBIX%20Latest%20Stable/4.0.3/zabbix-4.0.3.tar.gz/download" | tar zxvf -

   cd zabbix-4.0.9

3. Build with TLS support for encryption:

   ./configure --enable-agent --with-openssl --enable-ipv6
   sudo make install
   

4. Transfer compiled binary to FreeNAS system:

   scp /usr/local/sbin/zabbix_agentd root@$FREENAS_IP:/usr/local/sbin/
   

5. Leave VM: exit
6. Destroy VM (optional): vagrant destroy

FreeNAS

After the zabbix_agentd binary is transferred to the FreeNAS system, it’s time to SSH into it to configure the agent.

Zabbix Agent Configuration

1. Add user:

   pw groupadd zabbix
   pw useradd zabbix -c "Daemon user for Zabbix agent" -d /nonexistent -s /usr/sbin/nologin -w no -g zabbix 

   Create zabbix user and group via WebUI, otherwise they won't suvive a reboot

2. Create /etc/zabbix_agentd.conf:

   Server=$ZABBIX_SERVER_IP
   ServerActive=$ZABBIX_SERVER_IP
   Hostname=$ZABBIX_AGENT_HOSTNAME
   LogFile=/tmp/zabbix_agentd.log
   

Daemon Configuration

1. Enable daemon:

   echo 'zabbix_agentd_enable="YES"' >> /etc/rc.conf
   

2. Create /etc/rc.d/zabbix_agentd:

   #!/bin/sh
   
   # PROVIDE: zabbix_agentd
   # REQUIRE: DAEMON
   # KEYWORD: shutdown
   #
   # Add the following lines to /etc/rc.conf.local or /etc/rc.conf to
   # enable zabbix_agentd:
   #
   # zabbix_agentd_enable (bool): Set to NO by default.  Set it to YES to
   #         enable zabbix_agentd.
   #
   
   . /etc/rc.subr
   
   name="zabbix_agentd"
   rcvar=zabbix_agentd_enable
   start_precmd="zabbix_precmd"
   required_files="/etc/zabbix_agentd.conf"
   
   # read configuration and set defaultsc
   load_rc_config "$name"
   : ${zabbix_agentd_enable="NO"}
   #: ${zabbix_agentd_pre:=/etc/${name}.pre.sh}
   
   zabbix_agentd_conf="/etc/zabbix_agentd.conf"
   
   if [ ! -z "$zabbix_agentd_conf" ] ; then
     zabbix_agentd_flags="${zabbix_agentd_flags} -c ${zabbix_agentd_conf}"
     required_files=${zabbix_agentd_conf}
   fi
   
   zabbix_precmd()
   {
     if [ ! -z "$zabbix_agentd_pre" ] ; then
       if [ -e $zabbix_agentd_pre ] ; then
         . $zabbix_agentd_pre
       fi
     fi
   }
   
   command="/usr/local/sbin/${name}"
   
   run_rc_command "$1"  run_rc_command "$1"
   

3. Make executable:

   chmod +x /etc/rc.d/zabbix_agentd
   

4. Start daemon:

   /etc/rc.d/zabbix_agentd start
   

5. Make config files persistent and survive reboots:

   cp /etc/rc.conf /conf/base/etc/
   cp /etc/rc.d/zabbix_agentd /conf/base/etc/rc.d/
   cp /etc/zabbix_agentd.* /conf/base/etc/

Exit vagrant

in the ssh sesion type: exit

vagrant destroy

 Zabbix configuration

Use the template from the zabbix wiki for the host monitoring

http://zabbix.org/wiki/File:Template_OS_FreeNAS.xml

---

1. https://docs.j7k6.org/freenas-zabbix-agent/
2. https://blag.nullteilerfrei.de/2016/11/26/zabbix-3-0-agent-on-freebsd/
3. https://www.haphazard.io/blog/install-nagios-nrpe-on-freenas/