ansible-role-elasticsearch/templates/systemd/elasticsearch.j2

[Unit]
Description=Elasticsearch-{{es_instance_name}}
Documentation=http://www.elastic.co
Wants=network-online.target
After=network-online.target
{# Directive 'WorkingDirectory' creates an implicit dependecy for {{es_home}}, so it can be omitted here #}
RequiresMountsFor={{ data_dirs | array_to_str(separator=' ') }} {{log_dir}} {{pid_dir}} {{conf_dir}}

[Service]
Environment=ES_HOME={{es_home}}
Environment=CONF_DIR={{conf_dir}}
Environment=ES_PATH_CONF={{conf_dir}}
Environment=DATA_DIR={{ data_dirs | array_to_str }}
Environment=LOG_DIR={{log_dir}}
Environment=PID_DIR={{pid_dir}}
EnvironmentFile=-{{instance_default_file}}

WorkingDirectory={{es_home}}

User={{es_user}}
Group={{es_group}}

{% if (es_version is version_compare('6.0.0', '<')) %}
ExecStartPre=/usr/share/elasticsearch/bin/elasticsearch-systemd-pre-exec
{% endif %}

ExecStart={{es_home}}/bin/elasticsearch \
                                    -p ${PID_DIR}/elasticsearch.pid \
{% if (es_version is version_compare('6.0.0', '<')) %}
                                    -Edefault.path.logs=${LOG_DIR} \
                                    -Edefault.path.data=${DATA_DIR} \
                                    -Edefault.path.conf=${CONF_DIR} \
{% endif %}
                                    --quiet


# StandardOutput is configured to redirect to journalctl since
# some error messages may be logged in standard output before
# elasticsearch logging system is initialized. Elasticsearch
# stores its logs in /var/log/elasticsearch 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
{% if es_max_open_files is defined %}
LimitNOFILE={{es_max_open_files}}
{% endif %}

# Specifies the maximum number of bytes of memory that may be locked into RAM
# Set to "infinity" if you use the 'bootstrap.memory_lock: true' option
# in elasticsearch.yml and 'MAX_LOCKED_MEMORY=unlimited' in {{instance_default_file}}
{% if m_lock_enabled %}
LimitMEMLOCK=infinity
{% endif %}

# Specifies the maximum number of threads that can be started.  Elasticsearch requires a
# minimum of 2048.
LimitNPROC={{ es_max_threads }}

# 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