Installing InfluxDB and Grafana on CentOS 7

Sưu tầm

Introduction

In this guide, I will get you up and running with InfluxDB and Grafana on CentOS 7. Once you complete this setup, you can start collecting and displaying Realtime performance metrics from your favorite API.

Disclaimer: I prefer running InfluxDB and Grafana on Microsoft Windows since that's where my Powershell scripts are. However, the InfluxData team have been decreasing their Windows efforts lately. So, here we are.

Motivation

If you are interested in gathering VMware vSphere performance metrics, then you can use my vFlux-IOPS.ps1 and vFlux-Compute.ps1 scripts to feed InfluxDB (available on github). My PowerCLI scripts, along with InfluxDB and Grafana create a vSphere performance monitoring kit that I refer to as vFlux Stats.

Note: The vFlux Stats PowerCLI scripts can be downloaded from:
https://github.com/vmkdaily/vFlux-Stats-Kit

System Requirements

1 Virtual Machine (minimum)
CentOS 7 (requires vSphere 5.5 or later)
2 vCPU
8GB RAM
40GB Harddrive

Note: In this exercise, we will use a single disk for simplicity. In a high performance deployment, you will want dedicated disks for InfluxDB (i.e. Data and WAL) and most likely you would be running Grafana on an additional CentOS VM.

CentOS 7 - Initial Setup

Deploy a CentOS 7 VM (i.e. from template or ISO) then follow the steps below to configure an IP address, hostname, and perform typical OS updates, etc.

1. Login as root
2. Configure an IP address using the nmtui text-based user interface tool
3. Perform a systemctl restart network
4. Test your success so far ping google.com
5. Install VMware Tools with yum install open-vm-tools
6. Update the OS and existing packages with yum update
7. [optional] To allow root login via SSH, use the vi editor to uncomment the root login restriction.
   We will do this with vi /etc/ssh/sshd_config
8. [optional] If you made the change in #7 above, perform a systemctl restart sshd.service
9. If desired, confirm SSH access (i.e. with putty)

Note: If you need to resize your disk, consult http://kb.vmware.com/kb/1006371

Installing InfluxDB on CentOS 7

To install InfluxDB on CentOS, there are a few options. For this example, we will create a yum repository and install from there.

Add InfluxDB to yum
Just paste this entire snippet into your putty session:

cat <<EOF | sudo tee /etc/yum.repos.d/influxdb.repo
[influxdb]
name = InfluxDB Repository - RHEL \$releasever
baseurl = https://repos.influxdata.com/rhel/\$releasever/\$basearch/stable
enabled = 1
gpgcheck = 1
gpgkey = https://repos.influxdata.com/influxdb.key
EOF

Install InfluxDB

sudo yum install influxdb

We now have several binaries added to /usr/bin.

influx
influxd
influx_inspect
influx_stress
influx_tsm

Note:
influx is the CLI tool to manage things.
influxd is the actual binary that runs the program itself.

Allow InfluxDB through Firewall

firewall-cmd --permanent --zone=public --add-port=8086/tcp
firewall-cmd --permanent --zone=public --add-port=8083/tcp
firewall-cmd --reload

Configure InfluxDB
By default your config file will be at /etc/influxdb/influxdb.conf. However, you can create a new config file to modify if desired.

influx config > influxdb.generated.conf

Note: You can then use the -config parameter to launch InfluxDB. For example, influxd -config influxdb.conf

Configure InfluxDB for Automatic start-up

systemctl enable influxdb.service

Start InfluxDB

sudo service influxdb start

The InfluxDB Web Interface
Once InfluxDB is up and running, connect to it using a web browser.

http://<ip address>:8083

Using the influx CLI
To interact with your installation of InfluxDB (i.e. create users, databases, etc.) perform the following:

1. SSH to your InfluxDB VM
2. Change directory to /usr/bin
3. Type influx and hit enter

[root@centflux02 bin]# influx
Visit https://enterprise.influxdata.com to register for updates, InfluxDB server management, and monitoring.
Connected to http://localhost:8086 version 0.11.1
InfluxDB shell 0.11.1
>

Create InfluxDB User(s)
For this example, create a user called esx with a password of esx. Type the following into your influx CLI session and press enter.

CREATE USER esx WITH PASSWORD 'esx' WITH ALL PRIVILEGES

Tip: Influx commands only return interactive messages on failure. So after hitting enter above, if you get no feedback, this is good.

For full details on Influx authentication:
https://docs.influxdata.com/influxdb/v0.11/administration/authentication_and_authorization/

Create InfluxDB Database
For this example, create a database called iops and another called compute.

CREATE DATABASE iops
CREATE DATABASE compute

Note: We will use these databases in the next steps.

Installing Grafana on CentOS 7

To install Grafana on CentOS, there are a few options. For this example, we will create a yum repository and install from there. This is similar to how we got InfluxDB up and running.

Create a new file in /etc/yum.repos.d/grafana.repo and add the following:

[grafana]
name=grafana
baseurl=https://packagecloud.io/grafana/stable/el/6/$basearch
repo_gpgcheck=1
enabled=1
gpgcheck=1
gpgkey=https://packagecloud.io/gpg.key https://grafanarel.s3.amazonaws.com/RPM-GPG-KEY-grafana
sslverify=1
sslcacert=/etc/pki/tls/certs/ca-bundle.crt

Install Grafana

sudo yum install grafana

Configure Grafana

If desired, you can modify the Grafana config file at /etc/grafana/grafana.ini(i.e. to change the default port of 3000, etc.).

Configure Grafana for automatic start-up

sudo systemctl enable grafana-server.service

Start Grafana

systemctl daemon-reload
systemctl start grafana-server
systemctl status grafana-server

Allow Grafana through firewall

firewall-cmd --permanent --zone=public --add-port=3000/tcp
firewall-cmd --reload

Check Grafana Service Status

systemctl status grafana-server

The Grafana Web Interface
The default login is admin admin. Here, you can point Grafana to your InfluxDB databases. Later, we will also create graphs of our performance data from this interface.

http://<ip address>:3000

Checking your work

Before calling this done, let's confirm that both InfluxDB and Grafana are configured for auto-start.

systemctl list-unit-files | grep 'influx\|grafana'

The output from above should look similar to:

grafana-server.service                      enabled
influxd.service                             enabled
influxdb.service                            enabled

Next Steps

The next step is to start loading up the database with some performance stats from your VMware environment. For this task you can use my vFlux Stats kit. I provide the PowerCLI scripts to run against your vCenter. The scripts interrogate VMs and ESXi hosts for realtime performance data. The data is then written to InfluxDB and served up by Grafana.