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Install & Uninstall

TDengine community version provides deb and rpm packages for users to choose from, based on their system environment. The deb package supports Debian, Ubuntu and derivative systems. The rpm package supports CentOS, RHEL, SUSE and derivative systems. Furthermore, a tar.gz package is provided for TDengine Enterprise customers.

Install​

  1. Download deb package from official website, for example TDengine-server-2.4.0.7-Linux-x64.deb
  2. In the directory where the package is located, execute the command below
$ sudo dpkg -i TDengine-server-2.4.0.7-Linux-x64.deb
(Reading database ... 137504 files and directories currently installed.)
Preparing to unpack TDengine-server-2.4.0.7-Linux-x64.deb ...
TDengine is removed successfully!
Unpacking tdengine (2.4.0.7) over (2.4.0.7) ...
Setting up tdengine (2.4.0.7) ...
Start to install TDengine...

System hostname is: ubuntu-1804

Enter FQDN:port (like h1.taosdata.com:6030) of an existing TDengine cluster node to join
OR leave it blank to build one:

Enter your email address for priority support or enter empty to skip:
Created symlink /etc/systemd/system/multi-user.target.wants/taosd.service → /etc/systemd/system/taosd.service.

To configure TDengine : edit /etc/taos/taos.cfg
To start TDengine     : sudo systemctl start taosd
To access TDengine    : taos -h ubuntu-1804 to login into TDengine server


TDengine is installed successfully!
note

When installing on the first node in the cluster, at the "Enter FQDN:" prompt, nothing needs to be provided. When installing on subsequent nodes, at the "Enter FQDN:" prompt, you must enter the end point of the first dnode in the cluster if it is already up. You can also just ignore it and configure it later after installation is finished.

Uninstall​

Deb package of TDengine can be uninstalled as below:

$ sudo dpkg -r tdengine
(Reading database ... 137504 files and directories currently installed.)
Removing tdengine (2.4.0.7) ...
TDengine is removed successfully!

note
  • We strongly recommend not to use multiple kinds of installation packages on a single host TDengine.
  • After deb package is installed, if the installation directory is removed manually, uninstall or reinstall will not work. This issue can be resolved by using the command below which cleans up TDengine package information. You can then reinstall if needed.
   $ sudo rm -f /var/lib/dpkg/info/tdengine*
  • After rpm package is installed, if the installation directory is removed manually, uninstall or reinstall will not work. This issue can be resolved by using the command below which cleans up TDengine package information. You can then reinstall if needed.
   $ sudo rpm -e --noscripts tdengine

Installation Directory​

TDengine is installed at /usr/local/taos if successful.

$ cd /usr/local/taos
$ ll
$ ll
total 28
drwxr-xr-x  7 root root 4096 Feb 22 09:34 ./
drwxr-xr-x 12 root root 4096 Feb 22 09:34 ../
drwxr-xr-x  2 root root 4096 Feb 22 09:34 bin/
drwxr-xr-x  2 root root 4096 Feb 22 09:34 cfg/
lrwxrwxrwx  1 root root   13 Feb 22 09:34 data -> /var/lib/taos/
drwxr-xr-x  2 root root 4096 Feb 22 09:34 driver/
drwxr-xr-x 10 root root 4096 Feb 22 09:34 examples/
drwxr-xr-x  2 root root 4096 Feb 22 09:34 include/
lrwxrwxrwx  1 root root   13 Feb 22 09:34 log -> /var/log/taos/

During the installation process:

  • Configuration directory, data directory, and log directory are created automatically if they don't exist
  • The default configuration file is located at /etc/taos/taos.cfg, which is a copy of /usr/local/taos/cfg/taos.cfg
  • The default data directory is /var/lib/taos, which is a soft link to /usr/local/taos/data
  • The default log directory is /var/log/taos, which is a soft link to /usr/local/taos/log
  • The executables at /usr/local/taos/bin are linked to /usr/bin
  • The DLL files at /usr/local/taos/driver are linked to /usr/lib
  • The header files at /usr/local/taos/include are linked to /usr/include
note
  • When TDengine is uninstalled, the configuration /etc/taos/taos.cfg, data directory /var/lib/taos, log directory /var/log/taos are kept. They can be deleted manually with caution, because data can't be recovered. Please follow data integrity, security, backup or relevant SOPs before deleting any data.
  • When reinstalling TDengine, if the default configuration file /etc/taos/taos.cfg exists, it will be kept and the configuration file in the installation package will be renamed to taos.cfg.orig and stored at /usr/local/taos/cfg to be used as configuration sample. Otherwise the configuration file in the installation package will be installed to /etc/taos/taos.cfg and used.

Start and Stop​

Linux system services systemd, systemctl or service are used to start, stop and restart TDengine. The server process of TDengine is taosd, which is started automatically after the Linux system is started. System operators can use systemd, systemctl or service to start, stop or restart TDengine server.

For example, if using systemctl , the commands to start, stop, restart and check TDengine server are below:

  • Start server：systemctl start taosd

  • Stop server：systemctl stop taosd

  • Restart server：systemctl restart taosd

  • Check server status：systemctl status taosd

From version 2.4.0.0, a new independent component named as taosAdapter has been included in TDengine. taosAdapter should be started and stopped using systemctl.

If the server process is OK, the output of systemctl status is like below:

Active: active (running)

Otherwise, the output is as below:

Active: inactive (dead)

Upgrade​

There are two aspects in upgrade operation: upgrade installation package and upgrade a running server.

To upgrade a package, follow the steps mentioned previously to first uninstall the old version then install the new version.

Upgrading a running server is much more complex. First please check the version number of the old version and the new version. The version number of TDengine consists of 4 sections, only if the first 3 sections match can the old version be upgraded to the new version. The steps of upgrading a running server are as below:

  • Stop inserting data
  • Make sure all data is persisted to disk
  • Make some simple queries (Such as total rows in stables, tables and so on. Note down the values. Follow best practices and relevant SOPs.)
  • Stop the cluster of TDengine
  • Uninstall old version and install new version
  • Start the cluster of TDengine
  • Execute simple queries, such as the ones executed prior to installing the new package, to make sure there is no data loss
  • Run some simple data insertion statements to make sure the cluster works well
  • Restore business services
warning

TDengine doesn't guarantee any lower version is compatible with the data generated by a higher version, so it's never recommended to downgrade the version.

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