10.23. Monitoring Nodes and Virtual Environments via Zabbix¶

10.23.1. Installing the Zabbix Agent¶

Perform these steps on each Virtuozzo Hybrid Server 7.5 node that you want to monitor.

1. Install the Zabbix repository. For example:

   # rpm -Uvh https://repo.zabbix.com/zabbix/5.0/rhel/7/x86_64/\
   zabbix-release-5.0-1.el7.noarch.rpm
   # yum clean all
   

2. Install the agent package:

   # yum install zabbix-agent
   

3. Configure the Zabbix agent by editing /etc/zabbix/zabbix_agentd.conf as follows:

   Server=<zabbix_server_IP>
   ListenIP=<listen_IP>
   ServerActive=<zabbix_server_IP>
   Hostname=<hostname>
   Timeout=30
   AllowRoot=1
   

   Where:

   • Server and ServerActive are the Zabbix server IP address.

   • ListenIP is a node’s IP address that will listen for incoming connections from the Zabbix server.

   • Hostname is a unique name that must match the name you will use to register the host in the Zabbix web panel. It is recommended to use node’s actual hostname.

   • Timeout is increased to allow a heavily loaded node enough time to send the statistics data to the Zabbix server.

   • AllowRoot=1 is required to let the user zabbix collect statistics from the node.

4. Add the user zabbix to sudoers. For example:

   # visudo
   zabbix  ALL=(ALL)   NOPASSWD: ALL
   

5. Configure node’s firewall:

   # firewall-cmd --zone=public --permanent --add-port=10050-10051/tcp
   # firewall-cmd --reload
   

6. Install the Virtuozzo module and template:

   # yum install vz-zabbix-agent
   

   The package will supply the following Zabbix XML template:

   # rpm -ql vz-zabbix-agent | grep xml
   /etc/zabbix/templates/zbx_virtuozzo_template.xml
   

   You will need to import it to the Zabbix web panel later.

7. Enable and start the Zabbix agent:

   # systemctl enable zabbix-agent
   # systemctl start zabbix-agent
   

10.23.2. Configuring Zabbix Server¶

To see the data collected from the nodes, do the following in the Zabbix web panel:

1. Navigate to Configuration -> Templates. Click Import and import zbx_virtuozzo_template.xml obtained in the previous section.

2. Navigate to Configuration -> Hosts and click Create Host. In Host name enter the same name as specified in Hostname in zabbix_agentd.conf. Next, select a Group and provide agent network interface details in Interfaces. Specify other details if needed and click Add.

3. Navigate to Configuration -> Hosts -> <host> -> Templates. Find Template Virtuozzo in Link new templates and click Update.

   If you also want to use S.M.A.R.T. triggers provided by Virtuozzo, instead of or together with the standard ones, link Template Virtuozzo SMART as well.

The statistics for the host will become available in the Zabbix web panel in a short while.

Optionally, you can filter out unnecessary metrics by excluding ploop mounts from mounted file system discovery. Zabbix performs it every hour by default in its Linux server template. Moreover, you can safely filter out vme network interfaces of virtual machines. Do the following:

1. Navigate to Configuration -> Templates -> Template OS Linux by Zabbix agent -> Macros -> Inherited and template macros.

2. Locate the macro {$VFS.FS.FSNAME.NOT_MATCHES}. Add /vz/root/| to its start. For example:

   ^(/vz/root/|/dev|/sys|/run|/proc|.+/shm$)
   

   Newly discovered ploops will be filtered out from now on. The statistics for the already discovered ploops will be dropped when the grace period is over. The grace period is 30 days by default. You can change it in the file system discovery rule.

3. Locate the macro {$NET.IF.IFNAME.NOT_MATCHES} and add ^vme[0-9a-z]+| to its start. For example:

   (^vme[0-9a-z]+|$^Software Loopback Interface|^NULL[0-9.]*$|^[Ll]o[0-9.]*$|
   ^[Ss]ystem$|^Nu[0-9.]*$|^veth[0-9a-z]+$|docker[0-9]+|br-[a-z0-9]{12})
   

   Now newly discovered vme interfaces will be filtered out as well.

10.23.3. Supported Triggers¶

The following triggers (i.e. alerts) are supported for Virtuozzo Hybrid Server.

10.23.4. Managing Disk I/O Parameters¶

Note that I/O and IOPS limiting only works for supported I/O schedulers. The scheduler type is stored in /sys/block/<device>/queue/scheduler. For example:

# cat /sys/block/sda/queue/scheduler
noop deadline [cfq]

The I/O scheduler used is marked by square brackets. In this example, it is cfq.

The following I/O schedulers are supported:

• CFQ. A separate block device line with counters is added to the iostat file. For example:

  # cat /proc/bc/100/iostat
  flush 100 . 0 0 0 0 0 7389 1893968 0 0
  fuse 100 . 0 0 0 0 0 0 0 0 0
  sda 100 . 0 0 0 9000 1843380 245216 55845488 245028 188
  

• Deadline. The counters are added to the values in the flush line.

I/O and IOPS limiting does not work for devices with the noop I/O scheduler or without one (e.g., logical devices, CEPH RBD devices, and such).