[root@bj1-mysql-manager-prod-01 tmp]# rpm --scripts -qp  /tmp/proxysql-2.0.8-1-centos7.x86_64.rpm 
preinstall scriptlet (using /bin/sh):
# Cleanup artifacts
if [ -f /var/lib/proxysql/PROXYSQL_UPGRADE ]; then 
    rm -fr /var/lib/proxysql/PROXYSQL_UPGRADE
fi
postinstall scriptlet (using /bin/sh):
# Create relevant user, directories and configuration files
if [ ! -d /var/run/proxysql ]; then /bin/mkdir /var/run/proxysql ; fi
if [ ! -d /var/lib/proxysql ]; then /bin/mkdir /var/lib/proxysql ; fi
if ! id -u proxysql > /dev/null 2>&1; then useradd -r -U -s /bin/false -d /var/lib/proxysql -c "ProxySQL Server" proxysql; fi
/bin/chown -R proxysql: /var/lib/proxysql /var/run/proxysql
/bin/chown root:proxysql /etc/proxysql.cnf
/bin/chmod 640 /etc/proxysql.cnf
# Configure systemd appropriately.
/bin/systemctl daemon-reload
/bin/systemctl enable proxysql.service
# Notify that a package update is in progress in order to start service.
if [ $1 -eq 2 ]; then /bin/touch /var/lib/proxysql/PROXYSQL_UPGRADE ; fi
preuninstall scriptlet (using /bin/sh):
# When uninstalling always try stop the service, ignore failures
/bin/systemctl stop proxysql || true
postuninstall scriptlet (using /bin/sh):
if [ $1 -eq 0 ]; then
    # This is a pure uninstall, systemd unit file removed
    # only daemon-reload is needed.
    /bin/systemctl daemon-reload
else
    # This is an upgrade, ProxySQL should be started. This
    # logic works for packages newer than 2.0.7 and ensures
    # a faster restart time.
    /bin/systemctl start proxysql.service
    /bin/rm -fr /var/lib/proxysql/PROXYSQL_UPGRADE
fi
posttrans scriptlet (using /bin/sh):
if [ -f /var/lib/proxysql/PROXYSQL_UPGRADE ]; then
    # This is a safeguard to start the service after an update
    # which supports legacy "preun" / "postun" logic and will
    # only execute for packages before 2.0.7.
    /bin/systemctl start proxysql.service
    /bin/rm -fr /var/lib/proxysql/PROXYSQL_UPGRADE
fi