Technology Architecture
The Ganglia system is mainly divided into the following three modules:
- Gmond: Gmond runs on each monitored node and is mainly responsible for collecting and sending monitoring data
- Gmetad: Gmetad runs on one host per cluster and aggregates the data collected by each node and stores it in the RDD storage engine
- Gweb: Gweb is used to graphically display the data collected by gmetad. It runs on the apache server and is generally deployed on the same machine as gmetad in the cluster.
Machine configuration:
- Control node host: 10.20.4.56
- Monitored nodes: 10.20.4.57 (receive and save complete cluster data), 10.20.4.58 (receive and save complete cluster data), 10.20.4.59
installation steps:
1: Installation of monitored nodes
1.sudo apt-get update
2.sudo apt-get install ganglia-monitor
3. Configuration
Configure /etc/ganglia/gmond.conf file
vim /etc/ganglia/gmond.conf
The modification of the Global area is as shown below , only need to modify the user and send_metadata_interval
The Cluster area is modified as shown in the figure below , and the name is modified. This is the cluster name, which is used for the configuration of gmetad later.
The Udp_send_channel area is modified as follows , comment out mcasy_jion (for multicast), we use unicast here, replace 10.20.4.57, 10.20.4.58 with the name of your machine
Udp_recv_channel is modified as follows, just comment out mcast_join and bind
start gmond
sudo /etc/init.d/ganglia-monitor restart
Note:
You can run telnet localhost 8649 before starting
If the following figure appears, the xml content is installed correctly, and then install it down
You can also change the debug in gmond.conf from 0 to 100, see more logs, and then troubleshoot.
Two: control node installation
1.sudo apt-get update
2.sudo apt-get install rrdtool apache2 php5 ganglia-monitor gmetad ganglia-webfrontend
During the process, the apache2 restart dialog box appears, select yes
3. Copy the Ganglia webfrontend Apache configuration:
sudo cp /etc/ganglia-webfrontend/apache.conf /etc/apache2/sites-enabled/ganglia.conf
4. Configure the gmetad configuration file
vim /etc/ganglia/gmetad.conf
Find the data_source, the first parameter hadoop-cluster and the name of the cluster in gmond.conf must be the same, the second parameter is the same as the host in upd_send_channel, of course, there can be many, I have configured two here, the second is as redundant extra backup.
5. sudo ln -s /usr/share/ganglia-webfrontend/ /var/www/ganglia
6. Restart the service
sudo /etc/init.d/gmetad restart
sudo /etc/init.d/apache2 restart
7. If it appears
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It's because of missing mod-php and php7.0-xml modules:
sudo apt-get install libapache2-mod-php7.0 php7.0-xml ; sudo /etc/init.d/apache2 restart
8. Log in to http://10.20.4.56/ganglia to check the monitoring effect