PREIN

/bin/sh

if [ $1 -gt 1 ]; then
  # Upgrade - stop previous instance of rabbitmq-server
  systemctl stop rabbitmq-server.service
fi

# create rabbitmq group
if ! getent group rabbitmq >/dev/null; then
        groupadd -r rabbitmq
fi

# create rabbitmq user
if ! getent passwd rabbitmq >/dev/null; then
        useradd -r -g rabbitmq -d /var/lib/rabbitmq rabbitmq \
            -c "RabbitMQ messaging server"
fi

PREUN

/bin/sh

# We do not remove /var/log and /var/lib directories
# Leave rabbitmq user and group

if [ $1 -eq 0 ] ; then 
        # Package removal, not upgrade 
        /usr/bin/systemctl --no-reload disable rabbitmq-server.service > /dev/null 2>&1 || : 
        /usr/bin/systemctl stop rabbitmq-server.service > /dev/null 2>&1 || : 
fi 

# Clean out plugin activation state, both on uninstall and upgrade
rm -rf /var/lib/rabbitmq/plugins
for ext in rel script boot ; do
    rm -f /usr/lib/rabbitmq/lib/rabbitmq_server-3.1.5/ebin/rabbit.$ext
done

POSTIN

/bin/sh

if [ $1 -eq 1 ] ; then 
        # Initial installation 
        /usr/bin/systemctl preset rabbitmq-server.service >/dev/null 2>&1 || : 
fi

Triggers

rabbitmq-server < 2.8.4

/bin/sh

# Save the current service runlevel info
# User must manually run systemd-sysv-convert --apply opensips
# to migrate them to systemd targets
/usr/bin/systemd-sysv-convert --save rabbitmq-server >/dev/null 2>&1 ||:

# Run these because the SysV package being removed won't do them
/sbin/chkconfig --del rabbitmq-server >/dev/null 2>&1 || :
/bin/systemctl try-restart rabbitmq-server.service >/dev/null 2>&1 || :