Dgraph is probably the world’s most advanced graph, multi-model NoSQL database system with high availability across multiple systems, thus eliminating a single failure point.
If you need a database management system with a native multi-model and robust user interface, including high availability, you may want to look at Dgraph.
This database platform is used by small and large companies that process massive amounts of data. The system provides synchronous replication and automatic failover, so losing a hard disk or a server doesn’t affect services.
This brief tutorial shows students and new users how to install Dgraph on Ubuntu 16.04 | 18.04 LTS servers.
For more about Dgraph, please visit its homepage.
Install Required Packages
To install Dgraph, you may want to install some required packages and prepare your server.
First, run the commands below to install curl and apt-transport-https.
sudo apt update sudo apt install curl apt-transport-https
After installing the package above, continue below to install Dgraph.
Install Dgraph
Now that some required packages are installed follow the steps below to get Dgraph installed and configured. Dgraph has an official script that allows you to install and configure the server easily.
To get the script, run the commands below:
curl https://get.dgraph.io -sSf | bash
When you run the script above, you’re prompted to accept the license agreement and others.
After the steps above, run the commands below to install them.
/usr/local/bin/
You should see a similar message as shown below:
Latest release version is v1.0.11.
Downloading checksum file for v1.0.11 build.
######################################################################## 100.0%
Download complete.
Comparing checksums for dgraph binaries
Downloading https://github.com/dgraph-io/dgraph/releases/download/v1.0.11/dgraph-linux-amd64.tar.gz
######################################################################## 100.0%
Download complete.
Inflating binaries (password may be required).
Dgraph binaries v1.0.11 have been installed successfully in /usr/local/bin.
Please visit https://docs.dgraph.io/get-started for further instructions on usage.
Although Dgraph is installed and can function, there’s no way to control its services via Systemd. So with that, we’ll want to create these services so managing startups and shutdowns can be effortless.
To do that, run the commands below to create a system user called dgraph.
sudo groupadd --system dgraph
sudo useradd --system -d /var/run/dgraph -s /bin/false -g dgraph dgraph
After that, run the commands below to create directories for Dgraph logs and state files.
sudo mkdir -p /var/log/dgraph
sudo mkdir -p /var/run/dgraph/{p,w,zw}
sudo chown -R dgraph:dgraph /var/{run,log}/dgraph
After creating the directories above, you can begin creating each systemd service profile for each service.
There are three services we need to create: dgraph-zero.service, graph-ui. Service and dgraph.service
For the dgraph.service, run the commands below:
sudo nano /etc/systemd/system/dgraph.service
Then copy and paste the lines below into the file and save.
[Unit] Description=dgraph.io data server Wants=network.target After=network.target dgraph-zero.service Requires=dgraph-zero.service [Service] Type=simple ExecStart=/usr/local/bin/dgraph alpha --lru_mb 2048 -p /var/run/dgraph/p -w /var/run/dgraph/w StandardOutput=journal StandardError=journal User=dgraph Group=dgraph [Install] WantedBy=multi-user.target
For dgraph-zero.service, run the commands below:
sudo nano /etc/systemd/system/dgraph-zero.service
Then copy and paste the lines below into the file and save.
[Unit] Description=dgraph.io zero server Wants=network.target After=network.target [Service] Type=simple ExecStart=/usr/local/bin/dgraph zero --wal /var/run/dgraph/zw StandardOutput=journal StandardError=journal User=dgraph Group=dgraph [Install] WantedBy=multi-user.target RequiredBy=dgraph.service
For graph-ui.service. Run the commands below:
sudo nano /etc/systemd/system/dgraph-ui.service
Then copy and paste the lines below into the file and save.
[Unit] Description=dgraph.io UI server Wants=network.target After=network.target [Service] Type=simple ExecStart=/usr/local/bin/dgraph-ratel StandardOutput=journal StandardError=journal User=dgraph Group=dgraph [Install] WantedBy=multi-user.target
After the above,
sudo systemctl daemon-reload sudo systemctl enable --now dgraph sudo systemctl enable --now dgraph-ui
That should do it!
When you check the status of the service, you should see them all running and active.
systemctl status dgraph dgraph-zero dgraph-ui
See all services below:
● dgraph.service - dgraph.io data server Loaded: loaded (/etc/systemd/system/dgraph.service; enabled; vendor preset: enabled) Active: active (running) since Wed 2019-02-27 11:05:50 CST; 24s ago Main PID: 22272 (dgraph) Tasks: 58 (limit: 4663) CGroup: /system.slice/dgraph.service └─22272 /usr/local/bin/dgraph alpha --lru_mb 2048 -p /var/run/dgraph/p -w /var/ru Feb 27 11:05:54 ubuntu1804 dgraph[22272]: I0227 11:05:54.113076 22272 groups.go:388] Servi Feb 27 11:05:54 ubuntu1804 dgraph[22272]: I0227 11:05:54.113488 22272 mutation.go:158] Don Feb 27 11:05:54 ubuntu1804 dgraph[22272]: I0227 11:05:54.114168 22272 groups.go:388] Servi ● dgraph-zero.service - dgraph.io zero server Loaded: loaded (/etc/systemd/system/dgraph-zero.service; disabled; vendor preset: enabled Active: active (running) since Wed 2019-02-27 11:05:50 CST; 24s ago Main PID: 22271 (dgraph) Tasks: 13 (limit: 4663) CGroup: /system.slice/dgraph-zero.service └─22271 /usr/local/bin/dgraph zero --wal /var/run/dgraph/zw Feb 27 11:05:53 ubuntu1804 dgraph[22271]: I0227 11:05:53.855906 22271 node.go:83] raft.nod Feb 27 11:05:53 ubuntu1804 dgraph[22271]: I0227 11:05:53.856089 22271 raft.go:613] I've be Feb 27 11:05:53 ubuntu1804 dgraph[22271]: I0227 11:05:53.856165 22271 ● dgraph-ui.service - dgraph.io UI server Loaded: loaded (/etc/systemd/system/dgraph-ui.service; enabled; vendor preset: enabled) Active: active (running) since Wed 2019-02-27 11:06:00 CST; 14s ago Main PID: 22362 (dgraph-ratel) Tasks: 4 (limit: 4663) CGroup: /system.slice/dgraph-ui.service └─22362 /usr/local/bin/dgraph-ratel Feb 27 11:06:00 ubuntu1804 systemd[1]: Started dgraph.io UI server.
Now you continue below to access its web interface.
Access Dgraph Web Interface
Dgraph also comes with a web interface for easy management in your web browser. To log in, go to the server hostname or IP address followed by port # 8000
http://localhost:8000
Log on with no passwords.
Enjoy!
Congratulations! You have successfully installed Dgraph on Ubuntu 16.04 and 18.05
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