Installing from the Tarball for Systems Using Systemd Init

Users with a StreamSets enterprise account can install the Data Collector tarball and start it as a service for supported operating systems that use the systemd init system. Supported operating systems include CentOS 7, Oracle Linux 7, Red Hat Enterprise Linux 7, or Ubuntu 16.04 LTS.

For tarball installation instructions for operating systems that use the SysV init system, see Installing from the Tarball for Systems Using SysV Init.

This procedure walks through setting the default directories and the default system user and group used to start Data Collector as a service. Before you install, you can alternatively use the $SDC_DIST/systemd/sdc.service file to modify the environment variables that define directories and the system user and group.

Note: StreamSets does not recommend using NFS or NAS to store Data Collector files.

Installing the full Data Collector as a service requires root privileges.

Download the Data Collector full tarball from the StreamSets Support portal.
Use the following command to extract the tarball to the desired location, typically /opt/streamsets-datacollector/:
```
tar xf streamsets-datacollector-all-<version>.tgz -C <extraction directory>
```
For example, to extract version 4.2.0, use the following command:
```
tar xf streamsets-datacollector-all-4.2.0.tgz -C /opt/streamsets-datacollector
```
Use the following command from the directory where you extracted the tarball to copy systemd/sdc.service to the /etc/systemd/system directory:
```
cp systemd/sdc.service /etc/systemd/system/sdc.service
```
If you did not extract the tarball to the default directory /opt/streamsets-datacollector/, override the /etc/systemd/system/sdc.service file to modify the SDC_HOME and ExecStart values.

Override the default values in the sdc.service file using the same procedure that you use to override unit configuration files on a systemd init system. For an example, see "Example 2. Overriding vendor settings" in this systemd.unit manpage.
Use the following command from the directory where you extracted the tarball to copy systemd/sdc.socket to the /etc/systemd/system directory:
```
cp systemd/sdc.socket /etc/systemd/system/sdc.socket
```
Optionally, edit the /etc/systemd/system/sdc.socket file to modify the Data Collector port number. The port must match the one defined in sdc.properties. Default is 18630.
Create a system user and group named sdc.
For example, use the following command to create a system user and group with the next available group ID and user ID:
```
groupadd -r sdc && useradd -r -d <installation dir> -g sdc -s /sbin/nologin sdc
```
If you’re installing Data Collector on multiple machines, we recommend explicitly specifying a group ID and user ID to ensure that the IDs are consistent across the machines. Use the -g and -u flags respectively to specify the ID.
Use the following command to reload the systemd manager configuration:
```
systemctl daemon-reload
```
Use the following command to create the Data Collector configuration directory at /etc/sdc:
```
mkdir /etc/sdc
```
Use the following command from the directory where you extracted the tarball to copy all files from etc into the Data Collector configuration directory that you just created:
```
cp -R etc/* /etc/sdc
```
Use the following command to change the owner of the /etc/sdc directory and all files in the directory to sdc:sdc:
```
chown -R sdc:sdc /etc/sdc
```
Use the following commands to create the Data Collector log directory at /var/log/sdc and change the owner to sdc:sdc:
```
mkdir /var/log/sdc
chown sdc:sdc /var/log/sdc
```
Use the following commands to create the Data Collector data directory at /var/lib/sdc and change the owner to sdc:sdc:
```
mkdir /var/lib/sdc
chown sdc:sdc /var/lib/sdc
```
Use the following commands to create the Data Collector resources directory at /var/lib/sdc-resources and change the owner to sdc:sdc:
```
mkdir /var/lib/sdc-resources
chown sdc:sdc /var/lib/sdc-resources
```
Use the following command to start Data Collector as a service:
```
systemctl start sdc
```
To add the Data Collector service to the system startup, use the following command:
```
systemctl enable sdc
```
To access the Data Collector UI, enter the following URL in the address bar of your browser:
```
http://<hostname>:18630/
```