Merge branch 'develop' of https://github.com/Cacti/documentation into develop

Author: TheWitness

Frequently-Asked-Questions.md

@@ -172,7 +172,7 @@ Maximum Value field for all data sources used by these graphs. If the value
 being fed to the .rrd file exceeds its Maximum Value, RRDTool will insert an
 Unknown and you will see no data on the graph.
 
-*Q:** A lot of my graphs contain long ifAlias names, but they are being
+**Q:** A lot of my graphs contain long ifAlias names, but they are being
 truncated to 15 characters.
 
 **A:** Cacti does this by default to better control graph title formatting. You

General-Installing-Instructions.md

@@ -21,11 +21,11 @@ packages will vary by operating system.
 
 - rrdtool
 
-- help2man` (for spine)
+- help2man (for spine)
 
 - dos2unix (for spine)
 
-- development packages (gcc, automake, autoconf, libtool, help2man)
+- development packages (gcc, automake, autoconf, libtool, either mysql-devel or mariadb-devel, net-snmp-devel, help2man)
 
   (for spine)
 
@@ -286,16 +286,38 @@ VALUES ('localhost', 'mysql', 'cactiuser', 'time_zone_name', 'root@localhost', '
    (Enter a valid username for *cactiuser*, this user will also be used in the
    next step for data gathering.)
 
-7. Create a new file `/etc/cron.d/cacti` and add to it:
+7. Create your cron task file or systemd units file
 
-   ```ini
-   */5 * * * * cactiuser php <path_cacti>/poller.php > /dev/null 2>&1
-   ```
+   Starting with Cacti 1.2.16, you have the option to use either the
+   legacy Crontab entry, or an optional cactid units file and server
+   to run your Cacti pollers.
+
+   For Crontab use, follow the instructions below:
 
-   Replace *cactiuser* with the valid user specified in the previous step.
+   Create and edit `/etc/cron.d/cacti` file.
+   Make sure to setup the correct path to poller.php
 
-   Replace `<path_cacti>` with your full Cacti path.
+   ```console
+   */5 * * * * apache php <path_cacti>/poller.php &>/dev/null
+   ```
+
+   For systemd unit's file install, you will need to modify the
+   included units file to following your install location
+   and desired user and group's to run the Cacti poller as.
+   To complete the task, follow the procedure below:
+
+   ```console
+   vim <path_cacti>/service/cactid.service (edit the path)
+   touch /etc/sysconfig/cactid
+   cp -p <path_cacti>/service/cactid.service /etc/systemd/system
+   systemctl enable cactid
+   systemctl start cactid
+   systemctl status cactid
+   ```
 
+   The systemd units file makes managing a highly available Cacti
+   setup a bit more convenient.
+   
 8. During install, you will need to provide write access to the following files
    and directories: