Pseudo-Cluster Deployment

The purpose of pseudo-cluster deployment is to deploy the DolphinScheduler service on a single machine. In this mode, DolphinScheduler's master, worker, api server, and logger server are all on the same machine.

If you are a green hand and want to experience DolphinScheduler, we recommended you install follow Standalone. If you want to experience more complete functions or schedule large tasks number, we recommended you install follow pseudo-cluster deployment. If you want to using DolphinScheduler in production, we recommended you follow cluster deployment or kubernetes

Prepare

Pseudo-cluster deployment of DolphinScheduler requires external software support

  • JDK:Download JDK (1.8+), and configure JAVA_HOME to and PATH variable. You can skip this step, if it already exists in your environment.
  • Binary package: Download the DolphinScheduler binary package at download page
  • Database: PostgreSQL (8.2.15+) or MySQL (5.7+), you can choose one of the two, such as MySQL requires JDBC Driver 8.0.16
  • Registry Center: ZooKeeper (3.4.6+),download link
  • Process tree analysis
    • pstree for macOS
    • psmisc for Fedora/Red/Hat/CentOS/Ubuntu/Debian

Note: DolphinScheduler itself does not depend on Hadoop, Hive, Spark, but if you need to run tasks that depend on them, you need to have the corresponding environment support

DolphinScheduler startup environment

Configure user exemption and permissions

Create a deployment user, and be sure to configure sudo without password. We here make a example for user dolphinscheduler.

# To create a user, login as root
useradd dolphinscheduler

# Add password
echo "dolphinscheduler" | passwd --stdin dolphinscheduler

# Configure sudo without password
sed -i '$adolphinscheduler  ALL=(ALL)  NOPASSWD: NOPASSWD: ALL' /etc/sudoers
sed -i 's/Defaults    requirett/#Defaults    requirett/g' /etc/sudoers

# Modify directory permissions and grant permissions for user you created above
chown -R dolphinscheduler:dolphinscheduler dolphinscheduler-bin

NOTICE:

  • Because DolphinScheduler's multi-tenant task switch user by command sudo -u {linux-user}, the deployment user needs to have sudo privileges and is password-free. If novice learners don’t understand, you can ignore this point for the time being.
  • If you find the line "Defaults requirest" in the /etc/sudoers file, please comment it

Configure machine SSH password-free login

Since resources need to be sent to different machines during installation, SSH password-free login is required between each machine. The steps to configure password-free login are as follows

su dolphinscheduler

ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys

Notice: After the configuration is complete, you can run the command ssh localhost to test if it work or not, if you can login with ssh without password.

Start zookeeper

Go to the zookeeper installation directory, copy configure file zoo_sample.cfg to conf/zoo.cfg, and change value of dataDir in conf/zoo.cfg to dataDir=./tmp/zookeeper

# Start zookeeper
./bin/zkServer.sh start

Initialize the database

DolphinScheduler metadata is stored in relational database. Currently, PostgreSQL and MySQL are supported. If you use MySQL, you need to manually download mysql-connector-java driver (8.0.16) and move it to the lib directory of DolphinScheduler. Let's take MySQL as an example for how to initialize the database

mysql -uroot -p

mysql> CREATE DATABASE dolphinscheduler DEFAULT CHARACTER SET utf8 DEFAULT COLLATE utf8_general_ci;

# Change {user} and {password} by requests
mysql> GRANT ALL PRIVILEGES ON dolphinscheduler.* TO '{user}'@'%' IDENTIFIED BY '{password}';
mysql> GRANT ALL PRIVILEGES ON dolphinscheduler.* TO '{user}'@'localhost' IDENTIFIED BY '{password}';

mysql> flush privileges;

Run the latest schema file manually in dolphinscheduler/dolphinscheduler-dao/src/main/resources/sql/dolphinscheduler_*.sql to initialization you database. If you use MySQL, please run dolphinscheduler/dolphinscheduler-dao/src/main/resources/sql/dolphinscheduler_mysql.sql, for PostgreSQL run dolphinscheduler/dolphinscheduler-dao/src/main/resources/sql/dolphinscheduler_postgre.sql

NOTICE: In the latest version, the way running command sh script/create-dolphinscheduler.sh initialization database is broken, We have created a issue-6597 to track and fix this problem

Modify configuration

After completing the preparation of the basic environment, you need to modify the configuration file according to your environment. The configuration file is in the path of conf/config/install_config.conf. Generally, you just needs to modify the INSTALL MACHINE, DolphinScheduler ENV, Database, Registry Server part to complete the deployment, the following describes the parameters that must be modified

# ---------------------------------------------------------
# INSTALL MACHINE
# ---------------------------------------------------------
# Because the master, worker, and API server are deployed on a single node, the IP of the server is the machine IP or localhost
ips="localhost"
masters="localhost"
workers="localhost:default"
alertServer="localhost"
apiServers="localhost"

# DolphinScheduler installation path, it will auto create if not exists
installPath="~/dolphinscheduler"

# Deploy user, use what you create in section **Configure machine SSH password-free login**
deployUser="dolphinscheduler"

# ---------------------------------------------------------
# DolphinScheduler ENV
# ---------------------------------------------------------
# The path of JAVA_HOME, which JDK install path in section **Prepare**
javaHome="/your/java/home/here"

# ---------------------------------------------------------
# Database
# ---------------------------------------------------------
# Database type, username, password, IP, port, metadata. For now dbtype supports `mysql` and `postgresql`
dbtype="mysql"
dbhost="localhost:3306"
# Have to modify if you are not using dolphinscheduler/dolphinscheduler as your username and password
username="dolphinscheduler"
password="dolphinscheduler"
dbname="dolphinscheduler"

# ---------------------------------------------------------
# Registry Server
# ---------------------------------------------------------
# Registration center address, the address of zookeeper service
registryServers="localhost:2181"

Start DolphinScheduler

Use deployment user you created above, running the following command to complete the deployment, and the server log will be stored in the logs folder

sh install.sh

Note: For the first time deployment, there maybe occur five times of sh: bin/dolphinscheduler-daemon.sh: No such file or directory in terminal , this is non-important information and you can ignore it.

Login DolphinScheduler

The browser access address http://localhost:12345/dolphinscheduler can login DolphinScheduler UI. The default username and password are admin/dolphinscheduler123

Start or stop server

# Stop all DolphinScheduler server
sh ./bin/stop-all.sh

# Start all DolphinScheduler server
sh ./bin/start-all.sh

# Start or stop DolphinScheduler Master
sh ./bin/dolphinscheduler-daemon.sh stop master-server
sh ./bin/dolphinscheduler-daemon.sh start master-server

# Start or stop DolphinScheduler Worker
sh ./bin/dolphinscheduler-daemon.sh start worker-server
sh ./bin/dolphinscheduler-daemon.sh stop worker-server

# Start or stop DolphinScheduler Api
sh ./bin/dolphinscheduler-daemon.sh start api-server
sh ./bin/dolphinscheduler-daemon.sh stop api-server

# Start or stop Logger
sh ./bin/dolphinscheduler-daemon.sh start logger-server
sh ./bin/dolphinscheduler-daemon.sh stop logger-server

# Start or stop Alert
sh ./bin/dolphinscheduler-daemon.sh start alert-server
sh ./bin/dolphinscheduler-daemon.sh stop alert-server

Note:: Please refer to the section of "System Architecture Design" for service usage