Migrate InfluxDB OSS instances to InfluxDB Enterprise clusters

An InfluxDB OSS instance running InfluxDB 1.7.10 or later.
An InfluxDB Enterprise cluster running InfluxDB Enterprise 1.7.10 or later
Network accessibility between the OSS instances and all data and meta nodes.

Migrating does the following:

Deletes data in existing InfluxDB Enterprise data nodes
Transfers all users from the OSS instance to the InfluxDB Enterprise cluster
Requires downtime for the OSS instance

To migrate to InfluxDB Enterprise

Complete the following tasks:

Set up InfluxDB Enterprise meta nodes
Upgrade the InfluxDB binary on your OSS instance
Rebalance the cluster

Upgrade InfluxDB to the latest version

Upgrade InfluxDB to the latest stable version before proceeding.

Upgrade InfluxDB OSS

Set up all meta nodes in your InfluxDB Enterprise cluster. For information about installing and setting up meta nodes, see Install meta nodes.

Add the OSS instance to the meta /etc/hosts files

When modifying the file on each meta node, include the IP and host name of your InfluxDB OSS instance so meta nodes can communicate with the OSS instance.

Set up InfluxDB Enterprise data nodes

If you don’t have any existing data nodes in your InfluxDB Enterprise cluster, skip to the next step.

Remove the data node from the InfluxDB Enterprise cluster

From a meta node in your InfluxDB Enterprise cluster, run:
Delete existing data

On each data node dropped from the cluster, run:
```
sudo rm -rf /var/lib/influxdb/{meta,data,hh}
```
Recreate data directories

On each data node dropped from the cluster, run:
```
sudo mkdir /var/lib/influxdb/{data,hh,meta}
```

Ensure file permissions are correct

sudo chown -R influxdb:influxdb /var/lib/influxdb

Update the /etc/hosts file

On each data node, add the IP and hostname of the OSS instance to the /etc/hosts file to allow the data node to communicate with the OSS instance.

Upgrade the InfluxDB OSS instance to InfluxDB Enterprise

Stop all writes to the InfluxDB OSS instance
Stop the influxdb service on the InfluxDB OSS instance

sysvinit
```
sudo service influxdb stop
```
```
sudo systemctl stop influxdb
```
Double check that the service is stopped. The following command should return nothing:

Remove the InfluxDB OSS package

Debian & Ubuntu

sudo apt-get remove influxdb

sudo yum remove influxdb

Back up your InfluxDB OSS configuration file

If you have custom configuration settings for InfluxDB OSS, back up and save your configuration file. Without a backup, you’ll lose custom configuration settings when updating the InfluxDB binary.

Update the InfluxDB binary

Debian & Ubuntu

wget https://dl.influxdata.com/enterprise/releases/influxdb-data_1.8.2-c1.8.2_amd64.deb
sudo dpkg -i influxdb-data_1.8.2-c1.8.2_amd64.deb

sudo yum localinstall influxdb-data-1.8.2-c1.8.2.x86_64.rpm

Update the configuration file
- hostname to the full hostname of the data node
- license-key in the [enterprise] section to the license key you received on InfluxPortal OR license-path in the [enterprise] section to the local path to the JSON license file you received from InfluxData.
  
  The license-key and license-path settings are mutually exclusive and one must remain set to an empty string.
```
# Hostname advertised by this host for remote addresses.
# This must be accessible to all nodes in the cluster.
hostname="<data-node-hostname>"
[enterprise]
  # license-key and license-path are mutually exclusive,
  # use only one and leave the other blank
  license-key = "<your_license_key>"
  license-path = "/path/to/readable/JSON.license.file"
```
Transfer any custom settings from the backup of your OSS configuration file to the new Enterprise configuration file.
Update the /etc/hosts file

Add all meta and data nodes to the /etc/hosts file to allow the OSS instance to communicate with other nodes in the InfluxDB Enterprise cluster.
Start the data node

sysvinit
```
sudo systemctl start influxdb
```

After you upgrade your OSS instance to InfluxDB Enterprise, add the node to your Enterprise cluster.

From a meta node in the cluster, run:

influxd-ctl add-data <new-data-node-hostname>:8088

It should output:

Added data node y at new-data-node-hostname:8088

Add existing data nodes back to the cluster

If you removed any existing data nodes from your InfluxDB Enterprise cluster, add them back to the cluster.

From a meta node in the InfluxDB Enterprise cluster, run the following for each data node:

influxd-ctl add-data <the-hostname>:8088