[Unit]
Description=OpenSearch - ${OS_SERVICE_NAME}
Wants=network-online.target
After=network-online.target

[Service]
Type=forking
PrivateTmp=true
Environment="JAVA_HOME=${OS_SERVICE_JAVA_HOME}"
Environment="OS_HOME=${OS_SERVICE_PATH}"
Environment="OS_PATH_CONF=${OS_SERVICE_CONF}"
Environment="PID_DIR=${OS_SERVICE_PID_FOLDER}"
Environment="OS_SD_NOTIFY=true"

RuntimeDirectory=${OS_SERVICE_DIR_NAME}
WorkingDirectory=${OS_SERVICE_PATH}

User=${OS_SERVICE_USER}
Group=${OS_SERVICE_GROUP}

ExecStart=${OS_SERVICE_PATH}/bin/${OS_SERVICE_EXECUTABLE} -d -p ${OS_SERVICE_PID_FILE}

# StandardOutput is configured to redirect to journalctl since
# some error messages may be logged in standard output before
# OpenSearch logging system is initialized. OpenSearch
# stores its logs in /var/log/opensearch and does not use
# journalctl by default. If you also want to enable journalctl
# logging, you can simply remove the "quiet" option from ExecStart.
StandardOutput=journal
StandardError=inherit

# Specifies the maximum file descriptor number that can be opened by this process
LimitNOFILE=65535

# Specifies the maximum number of processes
LimitNPROC=4096

# Specifies the maximum size of virtual memory
LimitAS=infinity

# Specifies the maximum file size
LimitFSIZE=infinity

# Disable timeout logic and wait until process is stopped
TimeoutStopSec=0

# SIGTERM signal is used to stop the Java process
KillSignal=SIGTERM

# Send the signal only to the JVM rather than its control group
KillMode=process

# Java process is never killed
SendSIGKILL=no

# When a JVM receives a SIGTERM signal it exits with code 143
SuccessExitStatus=143

[Install]
WantedBy=multi-user.target