write_node_exporter.py

import sys

ETC_SYSCONFIG_NE = 'OPTIONS="--web.listen-address=:{port} --collector.textfile.directory ' \
                   '/var/lib/node_exporter/textfile_collector --collector.systemd --collector.processes"'

ETC_SYSTEMD_NE = '''[Unit]
Description=Node Exporter
After=network.target

[Service]
Type=simple
User=node_exporter
EnvironmentFile=/etc/sysconfig/node_exporter
ExecStart=/usr/bin/node_exporter $OPTIONS
Restart=always

[Install]
WantedBy=multi-user.target
'''

if __name__ == '__main__':
    if len(sys.argv) != 2:
        print('Provide port, please')
        exit(1)

    port = sys.argv[1]

    ETC_SYSCONFIG_NE = ETC_SYSCONFIG_NE.format(port=port)

    with open('/etc/sysconfig/node_exporter', 'w') as h:
        h.write(ETC_SYSCONFIG_NE)

    with open('/etc/systemd/system/node_exporter.service', 'w') as h:
        h.write(ETC_SYSTEMD_NE)

    print('OK')