Auto-start on Boot

1. Overview

TimechoDB supports registering ConfigNode, DataNode, and AINode as Linux system services via the three scripts daemon-confignode.sh, daemon-datanode.sh, and daemon-ainode.sh. Combined with the system-built systemctl command, it manages the TimechoDB cluster in daemon mode, enabling more convenient startup, shutdown, restart, and auto-start on boot operations, and improving service stability.

Note: This feature is available starting from version 2.0.9.1.

2. Environment Requirements

Item	Specification
OS	Linux (supports the systemctl command)
User Privilege	root user
Environment Variable	JAVA_HOME must be set before deploying ConfigNode and DataNode

3. Service Registration

Enter the TimechoDB installation directory and execute the corresponding daemon script:

# Register ConfigNode service
./tools/ops/daemon-confignode.sh

# Register DataNode service
./tools/ops/daemon-datanode.sh

# Register AINode service
./tools/ops/daemon-ainode.sh

During script execution, you will be prompted with two options:

1. Whether to start the corresponding TimechoDB service immediately (timechodb-confignode / timechodb-datanode / timechodb-ainode);
2. Whether to register the corresponding service for auto-start on boot.

After script execution, the corresponding service files will be generated in the /etc/systemd/system/ directory:

• timechodb-confignode.service
• timechodb-datanode.service
• timechodb-ainode.service

4. Service Management

After service registration, you can use systemctl commands to start, stop, restart, check status, and configure auto-start on boot for each TimechoDB node service. All commands below must be executed as the root user.

4.1 Manual Service Startup

# Start ConfigNode service
systemctl start timechodb-confignode
# Start DataNode service
systemctl start timechodb-datanode
# Start AINode service
systemctl start timechodb-ainode

4.2 Manual Service Shutdown

# Stop ConfigNode service
systemctl stop timechodb-confignode
# Stop DataNode service
systemctl stop timechodb-datanode
# Stop AINode service
systemctl stop timechodb-ainode

After stopping the service, check the service status. If it shows inactive (dead), the service has been shut down successfully. For other statuses, check TimechoDB logs to analyze exceptions.

4.3 Check Service Status

# Check ConfigNode service status
systemctl status timechodb-confignode
# Check DataNode service status
systemctl status timechodb-datanode
# Check AINode service status
systemctl status timechodb-ainode

Status Description:

• active (running): Service is running. If this status persists for 10 minutes, the service has started successfully.
• failed: Service startup failed. Check TimechoDB logs for troubleshooting.

4.4 Restart Service

Restarting a service is equivalent to stopping and then starting it. Commands are as follows:

# Restart ConfigNode service
systemctl restart timechodb-confignode
# Restart DataNode service
systemctl restart timechodb-datanode
# Restart AINode service
systemctl restart timechodb-ainode

4.5 Enable Auto-start on Boot

# Enable ConfigNode auto-start on boot
systemctl enable timechodb-confignode
# Enable DataNode auto-start on boot
systemctl enable timechodb-datanode
# Enable AINode auto-start on boot
systemctl enable timechodb-ainode

4.6 Disable Auto-start on Boot

# Disable ConfigNode auto-start on boot
systemctl disable timechodb-confignode
# Disable DataNode auto-start on boot
systemctl disable timechodb-datanode
# Disable AINode auto-start on boot
systemctl disable timechodb-ainode

5. Custom Service Configuration

5.1 Customization Methods

5.1.1 Method 1: Modify the Script

1. Modify the [Unit], [Service], and [Install] sections in the daemon-xxx.sh script. For details of configuration items, refer to the next section.
2. Execute the daemon-xxx.sh script.

5.1.2 Method 2: Modify the Service File

1. Modify the xx.service file in /etc/systemd/system.
2. Execute systemctl daemon-reload.

5.2 daemon-xxx.sh Configuration Items

5.2.1 [Unit] Section (Service Metadata)

Item	Description
Description	Service description
Documentation	Link to the official TimechoDB documentation
After	Ensures the service starts only after the network service has started

5.2.2 [Service] Section (Service Runtime Configuration)

Item	Meaning
StandardOutput, StandardError	Specify storage paths for service standard output and error logs
LimitNOFILE=65536	Set the maximum number of file descriptors, default value is 65536
Type=simple	Service type is a simple foreground process; systemd tracks the main service process
User=root, Group=root	Run the service with root user and group permissions
ExecStart / ExecStop	Specify the paths of the service startup and shutdown scripts respectively
Restart=on-failure	Automatically restart the service only if it exits abnormally
SuccessExitStatus=143	Treat exit code 143 (128+15, normal termination via SIGTERM) as a successful exit
RestartSec=5	Interval between service restarts, default 5 seconds
StartLimitInterval=600s, StartLimitBurst=3	Maximum 3 restarts within 10 minutes (600 seconds) to prevent excessive resource consumption from frequent restarts
RestartPreventExitStatus=SIGKILL	Do not auto-restart the service if killed by the SIGKILL signal, avoiding infinite restart of zombie processes

5.2.3 [Install] Section (Installation Configuration)

Item	Meaning
WantedBy=multi-user.target	Start the service automatically when the system enters multi-user mode

5.3 Sample .service File Format

[Unit]
Description=timechodb-confignode
Documentation=https://www.timecho.com/
After=network.target

[Service]
StandardOutput=null
StandardError=null
LimitNOFILE=65536
Type=simple
User=root
Group=root
Environment=JAVA_HOME=$JAVA_HOME
ExecStart=$TimechoDB_SBIN_HOME/start-confignode.sh
Restart=on-failure
SuccessExitStatus=143
RestartSec=5
StartLimitInterval=600s
StartLimitBurst=3
RestartPreventExitStatus=SIGKILL

[Install]
WantedBy=multi-user.target

Note: The above is the standard format of the timechodb-confignode.service file. The formats of timechodb-datanode.service and timechodb-ainode.service are similar.

6. Notes

1. Process Daemon Mechanism

   • Auto-restart: The system will auto-restart the service if it fails to start or exits abnormally during runtime (e.g., OOM).
   • No restart: Normal exits (e.g., executing kill, ./sbin/stop-xxx.sh, or systemctl stop) will not trigger auto-restart.

2. Log Location

   • All runtime logs are stored in the logs folder under the TimechoDB installation directory. Refer to this directory for troubleshooting.

3. Cluster Status Check

   • After service startup, execute ./sbin/start-cli.sh and run the show cluster command to view the cluster status.

4. Fault Recovery Procedure

   • If the service status is failed, after fixing the issue, you must first execute systemctl daemon-reload before running systemctl start, otherwise startup will fail.

5. Configuration Activation

   • After modifying the daemon-xxx.sh script, execute systemctl daemon-reload to re-register the service for new configurations to take effect.

6. Startup Mode Compatibility

   • Services started via systemctl start can be stopped using ./sbin/stop (no restart triggered).
   • Processes started via ./sbin/start cannot be monitored via systemctl.